US2394830A - Tractor loader - Google Patents

Description

Feb.. 12, 1946. N, c woQDgN TRACTOR LOADER Filed Sept.. 16, 1944 V5 Sheets-Sheet l N. C. WOODIN TRACTOR LOADER Feb. 12, 1946.

Filed Sept. 16, 1944 5 Sheets-Sheet 2 Feb. 12, 1946. N. c. wooDlN l TRACTOR LOADER lFiled sept. 1e, 1944 5 Sheets-Sheet 3 N. C. WOODIN .TRACTOR LOADER Feb. l2, 194.6.

Filed Sept. 16, 1944 5 Sheets-Sheet 4 bmx w@ WS .m my@ mm@ c. Q Wm N; c. wOoDlN 2,394,830

TRACTOR LADER Filed sept. 1e, 1944 ssheet'S-sheet 5 Feb. 12, 1946.

Patented Feb. 12, 1946 UNITED STATE S PATENT OFFICE- 20 claims.

The present invention is directed to improvements in a loader of the type adapted for mobile use and operation. The loader of the present design is more specifically of a construction wherein the operable mechanisms are all mounted and supported for their individual function upon a unitary frame, and wherein such frame is adapted t be mounted upon a tractor, power being furnished by the latter for operating the respective mechanisms and the loading units.

One of the main objects of the present invention is to provide a loading bucket which is supported and operated from the framework of the loader by means of articulated arms and wherein suitable means have been provided between the bucket and the framework for counteracting and resisting all load shock during the loading op erations. This particular feature has the advan-y tage of relieving the articulated arms supporting the loading bucket from the stresses and reac-l tionary forces creating those stresses at the time when the mobile unit directs the loading bucket into a pile of material. Neither of the armsQtheir pivotal connections, nor their pivotal mountings upon the framework are therefore subjected to the forces created during the loading of the bucket inasmuch as the reactionary means interposed between the bucket and the framework functions to transmit such loadingv forces directly to the framework supporting the loader and obviously to the tractor upon which the fra-me is mounted.

Another object of the present invention is to provide a lift means for the loading bucket which is so connected with the pivotal means mounted upon the framework and forming a portion of the articulated bucket supporting arms as to transmit a reactive force for continually urging the articulated arms in a direction to hold the bucket against the Iframe when the bucket is disposed in digging position. Thus the lift means carries out its own function of lifting the arms and bucket and acts in the dual capacity of urging the bucket against the frame face to relieve the bucket arms from the reaction of the digging thrust as pointed out above.

A further advantage of the present invention is embodied in the particular feature of providing a lost motion connection between the articulated arms to permit the bucket and its associated parts to travel through a' path having no definite geI ometric relation to the roving pivotal points es-` tablished between such arms. In other words, as illustrated in the preferred embodiment of the present invention, the bucket and its reactionary means can contact the vertical members on the frame and move substantially vertically adjacent the frame face, whereas the arms connected with the bucket are adapted to swing about their respective pivotal connections.

Another object of the present invention is to embody into a loader of the type referred to the faculty, by means of the articulated arms and their particular connections and supports, whereby the loader is adapted to raise a loaded bucket adjacent the frame and tractor, and to subsequently project the bucket outwardly away from the frame and tractor into a position overhanging a load receiving unit such as a truck, bin or the like.

Another feature extremely advantageous in a loader of this type is the particular arrangement comprising the power driven means for moving the bucket through its necessary operations tol perform the loading task together with the introduction of mechanism easily operated for causing a bucket jar when the bucket is disposed in dumping position for completelyv discharging the entire loaded material therefrom.

The above noted feature as to the emptying of the bucket while in dumping position is augmented. by the bucket construction per se. The bucket is made in two principal sections comprising a rigid back stop secured to the lifting arms, ard a pivotally supported scoop section having a bottom and two sides for coacting with the back stop to form the completed shovel or'bueket scoop. The parting line of these two sections is substantially at the nat forward face of the bucket back stop and by rocking the scoop section on its pivotal support carried by the back stop it is possible to jar the entire bucket by means of the scoop section being dropped against the back stop.

The bucket is also jarred when the scoop is rocked into its full open position.

The two sections oi the bucket are designed to permit a smaller lifting distance between digging position and load discharging position than in prior comparable loaders. The loader construe tion of this design only necessitates elevating the bucket to a position where the lowermost edge of the bucket back stop section can clear the sides of a vehicle being loaded or of a bin'or the like, and the dumping action is such that the movable bucket section forming the scoop of the bucket operates only in the space above a horizontal plane coincident with the lowermost edge of the bucket back stop. in other words, the scoop of the present design is auch that it does not discharge the load from the 'forward edge thereof providing the digging edge, but the scoop discharges the load through the rear open side thereof when the scoop is moved or rocked away from the adjacent surface of the back stop. With the foregoing design of bucket it is obvious that the vertical height of the basic framework of the loader may be reduced proportionately in respect to loaders wherein a dump type of bucket is employed that discharges its load forwardly 01T of the same edge with which the bucket is used for digging.

All other features and advantages incorporated into the loader of the present design and construction shall hereinafter be described and explained in the following detailed description having reference to the accompanying drawings which disclose a preferred embodiment of the loader.

In the drawings:

Fig. 1 is a general side elevational view of the tractor loader embodying the -principles and operations of the combined mechanisms of the present invention;

Fig. 2 is a front elevational view of the tractor loader illustrated in Fig. 1 with the lifting and dumping cables omitted therefrom for the sake of clarity;

Fig. 3 is a fragmentary plan view of the forward portion of the tractor loader illustrating certain details of construction thereof;

Fig. 4 is an. enlarged side elevational view of the tractor driven control mechanism employed for manipulating the bucket of the loader to carry out the functions thereof; and

Fig. 5 is a diagrammatic illustration of the essential working parts of the loader to demonstrate the operative actions of the bucket parts in a loader of this construction.

Referring now to Fig. 1, the loader frame indicated generally by the reference numeral l is illustrated as conveniently attached to a conventional tractor II, the frame I0 being a rigid attached portion of the tractor per se so as to follow the directed movements of such vehicle. It is understood that the frame may be constructed in different ways to furnish a supporting l medium for the operative loading mechanisms utilized. However, in the present embodiment the frame comprises in general a substantially vertically upright channel structure i2 forming a guide member which functions as an abutment member for the bucket I3 and its associated reactionary mechanisms Id; the rearwardly extending diagonal frame members I and overhead diagonal braces IS connected between members I2 and i5. A bracket Il is connected with the vertical members I2 of the framework and is bolted as at I8 to the chassis 2B of the tractor Il while the frame members I'terminate in a bracket 2i conveniently bolted as at 22 to the tractor .chassis 20. Other suitable crossbraces and intermediate members are also used to supplement the aforementioned main frame sections and shall only hereinafter be referred to when necessary.

As best illustrated in Figs. 2 and 3, it is to be noted that the' bucket supporting arms, the lift mechanisms, and the bucket dumping means are ably supported by brackets mounted upon the frame members i. The pivotal connection 25 comprises a cross pin or shaft 2l carried by the arms 28`for movement directly therewith, while the ends of arms 23 adjacent pin 2l are slotted as at 28 to form a lost motion connection between the two pairs of arms 23 and 24. Obviously, arm 24 being pivoted at 26 pivotally connects with arm 23 in the manner just described and comprises a pivotal means to swingably support the bucket I3 from the framework I0 of the loader.

The bucket ends of the arms 23 are suitably fastened to ears 36 comprising integral parts of the bucket back stop 3i which is the stationary section of the bucket I3 with respect to the dumping operation thereof. The movable section 32 of the bucket is pivotally supported and suspended by its shaft 33 from suitable brackets or arms 3d carried by the back stop 3l. The bucket section 32 forms a U-shaped scoop best illustrated in Figs. 2 and 3 having a bottom 35 flanked by the sides 36 and 3l, the forward edge of section 32 being provided with a hardened replaceable blade 35 for cutting into and digging under the loading material, the rearward edge lli! of the bottom 35 providing the discharge edge of the scoop in the present construction.

A pair of spaced bailles 6I and 2 are secured to the shaft 33 and to a cross strap 43 as shown in Figs. 1. 2 and 3. A pair of sheave or pulley 4segments d6 and il are Welded or otherwise 5secured to shaft 33 and braced by connecting members i5 from the baffles AI and 82, see Fig. 2. Segments t6' and 4l are adapted to rock directly with the movements of the movable section 32 of the bucket I3. A suitable cross shaft 5b is disposed and supported by ears 3B in aligned relation to the rear of the bucket back stop 3l as best shown in Figs. 2 and 3. A pair of connected links 52 and 53 are employed at each side of the bucket and are pivotally connected between shaft 50 and pins 54 on the segments 4B and l. These connected links are of such size as to maintain the two relatively movable bucket sections 3l and 32 in closed relation to each other when the links are disposed in aligned relation as shown in Fig. 1.

Links 52 are secured to the shaft 56 and any rocking movement of the shaft 5@ will throw thereby the links 52 and 53 out of alignment permitting the segments 68 and el together with the movable section 32 of the bucket to swing away from the stationary back stop 3l. To rock shaft 5b and to move links 52 and 53 out of their substantial straight line position between their connected segments t6 and 6l, one of the links 52 is provided with an actuating lever 55 as shown in Figs. 1, 2 and 3.

A dump control lever 51 is secured to a cross shaft 58 suitably pivoted in housings 60, and the latter are conveniently secured to and carried by the pivotal ends of the bucket arms 23. An arm SI is secured to the cross shaft 53 and a connecting rod or link such as 62 extends beltween the arm 6I and the dump control lever 55.

A pair of cables $3 and 5t are each secured to their ieespective segments 45 and 61 at the Y forward ends thereof as at S5 in Fig. 1, and such cables follow the peripheries of the segment sheave grooves and pass under sheaves e6 and l carried by the cross shaft 5@ and extend rearwardly to the pivotal ends of the arms 23. Sheaves 53 and lll, see Figs. 1 and 2, are carried at the rearward ends of the arms 23 and are pivarm |48 having pivotal connection at |45 with brake |32. trol levery it is possible to control both brakes and the connecting link |02, that leads to the main control lever 95 as indicated in Fig. 1.

Clutch |33 is provided with a pivotally supported clutch control lever 48 having an actua-- tion Vroller |41 'pivotally carried thereby in a position to be in line for engagement by the cone end |36 of the coneY |35. Similarly, the clutch |34 has a clutch control lever |50 supporting roller in a position to be engaged by the other cone end |31 of thecone |35. In either case, the movelment of the cone in one direction or the other will cause a shifting of one or the other of the control levers of the clutches |33 and |34 thereby connecting the spider portion of the respective clutches keyed to the. shaft |23 with either of the drums 13 or 94 respectively as the case may be. 'I'hus the drive is transmitted directly from the shaft through either one of the clutches directly to the drum Iadjacent thereto depending upon the direction in which the cone |35 is shifted through the instrumentality of the main control `lever 95, connecting link |02, and the link mechanism generally indicated at |03 in Fig. 4.

Still referring to Fig. 4, the brake |3| is operated through a brake arm |52 pivotally supported upon the shaft v|53 mounted inthe auxiliary frame |28, said shaft |53 having an arm |54 connected with the band ofthe braker`|3|v at |55. Similarly, the brake arm |56 is rockable and connected with the shaft |51Y of the auxiliary frame. This arm |56 connects with the band of the brake l I 32 through an arm |58 secured to the band at |60.

Springs 6| and |62 are hooked ontoa bracket |83 secured to the auxiliary frame |28, While 3links |84 and A|85 connect these springs respectively to the brake arms |52 and |56. Under normal conditions of operation, with the respective'mechanisms all in neutral positions as indicated in Fig. 4, the springs IBI and |82 both act `to maintain the brakes |3| and |32 applied and operating linkage for the brake |32 comprises a similar arm |1| keyed to the shaft |43, said arm having a lost motion connection |12 with i the connecting link |13 and the latter is pivotally connected at |18 with the brake arm |55 for the With the use of a single hand conclutches to obtain the results desired in operating the bucket movements.

In addition to the particular` linkages above described in connection with the operation of the mid-point of the drum with the two leads thereof operating to Veither side oi' the fastening point and running to the segments 46 and 41 of the bucket terminating at the ends thereof as described. l'Likewise, -the cables -18 and 80 are also continuous'l and are secured at the center point of the drum 94 substantially as shown at |8| and to wind upon such drum to either side of the fastening point, the ends 18 and 80 thereof leading up to the idler sheaves 9| for connection with the slide members 11 disposedy on each side of the loader fram'e for lifting purposes'ln a manner hereinbefore described.

The automatic control which limits the upward Y movement of the bucket arms functions to control themaximum vertical height towhich the bucket may be moved. In addition thereto a pair of stops in the form of laterally extending brackets |82 mounted upon the diagonal braces I6 of the frame |8 provide means for limiting the angular movement of the arms 24 at the limit forY projecting of the bucket away from the tractor frame as illustrated in Fig. 5. 1 l

The operation and control of the loader bucket in the performance of theV loading operation is accomplished in the following manner. With the bucket and its connected supporting parts'all in a position indicated in full lines in Fig. 1, the

operator of the tractor guides the tractor toward the material to be loaded driving the.' bucket I3 into such material. Thereafter, the bucket may be raised from the position the tractor then occupies or else the tractor may beA reversed to draw the loaded bucket away from the material pile depending upon conditions oi operation. Assuming the' bucket is loa-ded and in conditionrto be raised, the operator moves the main control lever 95 upwardly actuating the connecting link |02 toward the front of the tractor and rocking the shaft |43 in a counter-clockwise direction to move the cone |35 toward the clutch |34 of the lifting drum 94, Before the cone |35 is moved sumvclently for the cone end |31 to engage the clutch Yoperating roller |5| the brake link |13 is actutwo independent brakes 3| and |32.and the two ,60 |34 will Ydrive drum 94 directly from the shaft distinct clutches |33 and |34, an auotmatically operable'control means has been introduced for `limiting the 'upward swing of the bucket and the `bucket arms. This means comprises an Vadditional arm |15 secured to shaft |43 and having a con- 4:nesting link |16 pivotally secured to thev outer endV thereof at |11, the'link |16 terminating with a horizontally disposed catch |18 best shown in Figs. l and 3.v The catch |18 projects into thel `path oi one ofthe bucket arms 23.

This catch 18 and the connecting link |18 may be suitably `guided and heldin position from one of the diag- -onal'braces |3 of the framework by any appro- Y priate `means for the purpose oi` substantially Y maintaining this automatic control in proper re- 8| andthe slides 11, and consequently, the arms i 23 which are resting upon rollersv 32 carried byV ,|23 to wind the cables 18 and 80 upon drum 94 to raise the bucket. Cables 18 and 80 lift sheaves the slides are swung upwardly about their pivotal connections at 25 at theends of the arms 24.

Inasmuch as the path of the bucket and the reactionary means is generally vertical Valong the front face of the framework, the slots'28 in the arms permit rearward movement of such arms at the pivotal point 21 thereby accommodating themselves to the line of motion of the bucket,

through the lost motionconnection oi' the articulated arms.

Motion of the bucket may be stopped at any asu-,530

bucket is entirely free of material. Moving lever point intermediate the positions illustrated in Fig. l by moving the control lever 95 back to its normal neutral position. In the event that the bucket is to be raised to the uppermost position the operator may depend upon the automatic control means |16|18 to rock shaft |43 through arm when the arm 23, which is in the path of such control, strikes the latter and interrupts the lifting motion of the drum 94 by automatically releasing clutch |34 and setting the brake |32.

During the lifting action and the control and operation of the drum 94 it is seen from Fig. 4 that the lost motion connection |51 prevents brake release of the drum 13 and the latter remains dormant and has no function at this time. Now however, with the bucket in raised position, the operator may then move the main control lever 95 downwardly through neutral position to reverse the former action of the brakes and clutches causing the brake |3| to be initially released from the drum 13 and shifting the cone |35 to actuate clutch |33 whereupon shaft |23 will then be connected to directly drive the drum 13. At this time the brake |05 is automatically released to face the pivot shaft 26. Cables 63 and 64 will then swing arms 24 forwardly of the tractor about their pivotal mountings 26 since these cables pass over the arm sheaves 68 and 10. see Fig. 2. This action will cause arm'sv 23 to roll forwardly upon the rollers 82 of the slides 11 thereby projecting the bucket forwardly and awayfrom the frame and tractor substantially into the overhanging position indicated in full lines in Fig. 5. This outward movement of the arms 23 and the outward thrust of the bucket I3 is halted when the arms 24 engage suitable stops |82 that may be carried upon the frame brace |6. By adjustably securing the stops |82 it is possible to provide a somewhat variable field within which to limit the outward thrusted movement of the bucket under various conditions of operation.

When the arms 24 strike the stops |82, clutch |33 will slip until the bucket trip lever 51 is pulled toward the operator. This action will cause a rocking of shaft 50 on the bucket which will throw pairs of the links 52 and 53 out of line to p ermit drum 13 to again pull cables 63 and 64 an additional amount sufficient to rock the segments 4B and 41 together with the movable section 32 of the`bucket. The latter is then rocked into a position substantially as indicated in dotted lines in Fig. 5. Any suitable limit stop 5| may be provided on the stationary bucket section 3| to be struck by some part of the movable bucket section 32 as by the adjacent corners of the segments 46 and 41. This causes a lar and a discharge of the loaded material which slides and drops off of the back stop 3| of the bucket and downwardly out of the rear edge 40 of the 'movable scoop section of the bucket to permit the latter to quickly and readily empty itself. Should any of the material be of a nature as to stick to sides of the bucket or bucket scoop sections, it is possible to also allow the scoop section 32 to drop against the back stop 3| to jar loose such sticky material. This is done by pulling the main control lever 95 upwardly to release clutch |33 an amount that will free drum 'i3 without making the brake |3| effective whereupon the weight of the bucket section 3| will reverse the directional movement of the cables S3 and 64 and the connected drum 13. This jarring action may be repeated several times until the 95 down each time will canse the bucket to open and the movable section will engage stop 5i, dropping back as lever Sli is raised toward neutral, etc.

After the bucket is emptied'it is returned to its position against the frame aftern restoring lever 51 to straighten links 52 and 53 by rais` ing the main control lever 95 a suflcient amount to release clutch |33 and into a position to keep brake |3| 'off and this same action releases the brake |05 on the pivot shaft 26 of the arm 24. The weight of the bucket I3 and bucket arms 23 acting through-the slides 11 upon the cables 18 and 80 will then swing the tail piece 83 in a counterclockwise direction moving the arms 24 therewith to` retractarms 23 rearwardly of the tractor and frame until the bucket shoes 14 again strike the forward surface of the vertical channels |2. At this point the arms 24 and tail pieces 88 will again substantially occupy the position indicated in Fig. 1 and the bucket may now be returned to the ground.

' The lowering of the bucket is accomplished by raising the lever 95 slightly oi of neutral position to release brake |32 of the lift drum but not a sufficient amount to cause the clutch cone to operate the lift drum clutch |34. As the arms 23 descend along the forward face of the frame together with the bucket, downward action may be halted at any intermediate point by returning the main control lever 95 to its neutral position rendering brake |32 effective. Otherwise, theraction of the bucket will continue until 35 the same has reached its lowermost ground position as indicated in full lines in Fig. 1.

The entire cycle of operation is brought about through the single control lever 95 which governs all the movements of the bucket. The only other u) control means resides in lever 51 which provides the trip means to permit the bucket thrusting mechanism to function in the dual capacity of initially projecting the bucket and subsequently opening the same toclear the load from the bucket. During the entire cycle of operation the pivot shaft brake |05 has been connected and arranged to prevent swinging of arms 23--24 except at a time when such arms must :move to thrust the bucket outwardly and to permit the free return thereof toward the frame l0 after load discharge. Brake |35 therefore remains on at all times excepting when lever 95 is moved downwardly to a point where it has caused a release of brake |3| and just before clutch |33 is rendered operative. This is during the operation of lever 95 below neutral position and while the same is acting to control the operation o drum 13 and its brake and clutch.

Attention is directed to the fact that when faces of the channel members l2 and in slideable contact therewith when the bucket is brought to the ground for loading as in Fig. 1.

Another feature worthy of attention at this point is that the bucket when raised to a certain in Fig. with the corner'thereof coincident with.

the clearance line a-b, such line may be assumed as representing a maximum clearance position. Thereafter, by performing the dumping action of the bucket it is to be noted that the lowermost corner e@ of the scoop section 32 moves through an are indicated Aby the lettere which is in a direction upwardly from the clearance line af-b. A truck ltmay therefore be loaded with the present' loader without requiring additional height of structure and lifting mechanism thatv would be necessary with dump. buckets which pivot and drop into the truck or toward the loaded material heaped within the truck.

With the above clearance action of the bucket there is vone additional feature to be noted.

When the bucket is raised from the ground into 2 the dotted position in Fig. 1 the same is presumably high enough to clear the truck or bin sides. The bucket is now held in this position by the brake 32 on the lifting drum 9d while the other drum i3. is madeto project such bucket out-1 wardly. As the arms 2e rotate or swing abouty pivot shaft 26, the ytail-pieces 8d act to pull cables it and il@ an added amount as best evident from Fig. l. This causes a slight addedv lift of the bucket providing asafety feature giving the bucket a little more elevation than which was deemed sufficient for clearance necessary. This action results for any given elevation of the bucket.

The loader of the present design and construction. is a highly eilicient unit embodying the various features pointed out above, comparatively simple in construction, and embodying but one control lever for operating the same through. all of its movements of operation aside from the ac tual dumping of the bucket which`is also accomplished by the simple lever link construction described. Furthermore, the bucket of the design illustrated in combination with the working mechanisms or" the loader produces a loader requiring a minimum of height of framework in view of the fact that the bucket is not the forward dumping type necessitating additional clearances as hereinbefore explained. Also the present construction of dump bucket is such as to eliminate the use of a push-ofi and the associated mechanisms needed in obtaining a complete discharge of the load from within that type of a bucket. able additional cost as well as more parts adding not only to the nrst cost but to the maintee nance of such a loader as well.

`t is to be understood that the foregoing de scription and disclosure are all directed more specifically to an exemplary preferred construction ci loader. Various changes and. modicatlons are contemplated to produce equivalent mechanisms or mechanical structures that may function or produce the same operative requirements in a like manner as do the mechanisms described.

It is obvious, therefore, that the present form,

. construction, or combination of parts described illustrated are not to be limited to the exact disclosures excepting insofar as such structures Such a means runs into consider-- ACn ascenso Y ried rby said bucketand contacting said vframe tocounteract load shockas said bucket ,is being directed into loading material, and lift'means for raising and lowering said bucket, said lift means being connected to normally urge and maintain the reactionary means of said bucket in operative contact with saidframe'to relieve the bucket i arms and their connections with said bucket from all load shock when vdriving the bucket into the materials being loaded.

2. A loader for a vehicle, comprising a frame unit mounted upon said vehicle, a loading unit disposed adjacent said frame unit, operable means including arms pivotally mounted on said frame unit and connected with said loading unit to move the latter toward and away from said frame unit, reactionary means carried by one of said units and contacting the other of said units to transmit loading shock of the loading unit directly to said frame unit, and lift means to the operable means to move the loading unit,

said lift means also being connected with said arms of said operable means to urge and maintain said reactionary means therethrough intol operative shock resisting relation between the aforesaid two units while said loading unit is in digging position.

3. A loading attachment for a mobile vehicle,

comprising a framework rigidly mounted upon'Y said vehicle and having an abutment member,

i0 a loading bucket operably disposed adjacent said abutment member, reactionary means carried by said bucket and contacting said abutment member to `resist load shock as said bucket is directed.

into the material being loaded, arms for said bucket to raise or lower the same, pivotal means to support said arms and bucket upon said framework, and lift means connected with said arms to raise and lower said bucket, said lift means being connected with said pivotal means to main- 5o tain the reactionary means of said bucket in conn means being connected with said movable armsv to urge the latter in a direction to hold said bucket arms and bucket in adirecticn to render said reactionary means effective when loading thereby preventing load shock transmittal to said arms or to the connections of the arms With said bucket.

5. A loader comprising a supporting frame haveg@ ing guide means, -a loading bucket disposed adjacent said guide means and having a contact member, arms connected with said bucket, Laivot-I al means for shiftably supporting the free ends of said bucket arms relative to said frame, and lift to means connected to raise and lower said bucket aangaan during the loading operation, said` lift4 means being connected with said pivotal means and adapted to normally maintain said contact member in cooperative engagement with said guide means through the instrumentality of saidvbucket arms when' the bucketis in load receiving position.

6. A; loader comprising a supporting frame, a substantially vertically disposed guide member connected with said frame, a loading bucket having shoe means in abutting engagement with said" having guide means, a loading bucket disposed Y adjacent said guide means,. said bucket having a contact member mounted directly thereon to engage the guide means, arms connected with said bucket, pivotal means for shiftabiy supporting the free ends of said bucket arms relative to said frame, lift means connected to raise and lower said bucket during the loading operation, said lift means being connected with said pivotal means and adapted tonormally ,maintain said Contact member in cooperative engagement with said guide means through said instrumentality of said bucket yarms when loading to relieve said arms and their connections with the bucket from load shock, and actuating means connected with said pivotal means to project the bucket arms and bucket outwardly and away from said frame guide means into load discharging relation, said lift means functioning to return said bucket toward saidguide means upon release of the aforesaid actuating means.

8. A loader comprising a supporting frame having guide means, a loading bucket disposed adjacent said guide means and having a contact member engageable with said guide means, arms connected with said bucket, pivotal means for shitably supporting the free ends of said bucket arms relative to said frame, lift means connected to raise and lower said bucket during the loading operation, actuating means connected with said loading bucket and connected with said pivotal means to urge said bucket arms and the bucket outwardly and away from said frame guide into load discharging relation, said lift means being connected with said pivotal means to shift the latter to return said bucket and its contact mem-- ber to the' guide means upon release of the aforesaid actuating means, and bucket trip means to discharge the bucket load connected to cause said actuating means to dump said bucket.

9. A loader comprising a supporting frame, a substantially vertically disposed guide member connected with said frame, a loading bucket having shoe means for abutting engagement with said guide member when said bucket is in certain positions, arms connected with said bucket, pivotal means carried by said frame and'adapted to shiftably support the free ends of said bucket arms for movement relative to said frame, power lift means connected with said bucket to raise and lower the same during the loading opera tion, said lift rneans being connected with said ,pivotal means to normally urge said bucket arms in a direction to cause said bucket shoe means to move toward said guide member, and power actuated means connected with said pivotal means to move said bucket away from said guide member intor a projected dumping position.

l0. A loader comprising a supporting frame, a guide member connected with said frame, a loading bucket having vshoe means'for abutting engagement with said guide member, arms connected with said bucket, pivotal means carried by said frame and adapted'to shiftably support the free ends of said bucket arms for movement relative to said frame, power lift means connected with said bucket to raise and lower the same during the loading operation, said lift means being connected with said pivotal means to normally urge said bucket arms in a direction to cause said bucket shoe means to move toward said guide member, power actuated means connected with said pivotal means and connected to said bucket to cause the latter v'to be moved outwardly away from said guide member when said power actuated means is operated to dispose said bucket into dumping position, and bucket trip means to discharge the bucket load connected to cause. said actuating means to dump the bucket,

il. A loader comprising a supporting frame, a

guide member connected with said frame, a load-- ing bucket having shoe means to abut said guide member, arms connected with said bucket, pivotal means carried by said frame and adapted to shiftably support the fr eeends ofsaid bucket arms for movement relative to said frame, lost motion means interposed between said bucket arms and said pivotal means, and lift means connected with said bucket to Vraise and lowerthe same during the loading operation, saidflift Y connected with said bucket and having trip means to cause the actuating means to dump said bucket while holding the same in projected position.

l2. In a loader, a frame, a bucket, articulate arms pivotaliy mounted upon'said frame and connected with said bucket, power lift means to raise and lower said bucket connected with said articulate arms at two separate points, said lift means acting to raise said bucket at one point of connection with said arms, the weight of said bucket acting on said articulate arms through said lift means at said second point of connec tion of the liit means to normally urged said bucket into abutting contact with said frame durn ing loading.

i3. In a loader, a framey a bucket, articulate arms pivotally mounted upon said frame and conn nected with said bucket, power lift means to raise and lower said bucket connected with said articulate arms at two -sparate points, said lift means acting to raise aid bucket at one point connection with said arms, the weight oi said bucket acting on said articulate arms through said. lift means at said second point of canned tion of the liit means to normally urge said bucket into abutting contact with said frame during loading, and power means connected with the bucket and having connection with said articulate arms at a third point whereby said bucket `may be projected outwardly away from said frame.

14. In a loader, a frame, a bucket having separable sections, articulate arms pivotally mounted upon said frame and connected with said bucket, power lift means to raise and lower said bucket connected with said articulatearms at `two spaced points, said lift means functioning to raise said bucket through one of the connecting points with said arms, the bucket weight acting on said lift means to cause said lift means `to act upon said articulate arms at said other point of connection to normally urge the bucket towardY said frame, power means connected with one of the separable bucket sections and connected with said articulate arms at a third point, said latter power means acting to project said bucket outwardly away from said frame when operated, and trip means to normally retain said bucket sections inload carrying relation, said f trip means when operated causing said power means to open said separable bucket sections to discharge the load while said power means holds the bucket in projected'position.

15. An arm supported bucket for a loader, said bucket comprising two separable sections, one section being fixed with respect to the bucket arms,

the other section being swingably supported from said xed section, both sections together forming a material carrier with the xed section a backstop for the material and the movable section' a scoop therefor, said movablesc'oop section having a bottom providing a cutting edge to dig into the material to be loaded, said bottom being disposed at right angles with respect to the backstop section to transmit the digging force i directly to said backstop without straining the point of supportbetween said sections, and means for causing separation of said sections to permit the material to discharge through the gap formed by the separation Yof said two sections.

' 16. An arm supported bucket for aloader, said angles to said fixed section to transmit the digging f orce directly to said fixed section without Y straining the pivotal connection between said sections, and means foractuating said movable section away from" said fixed section to discharge the loaded material, said pivotal connection between said sections being positioned to cause the movable vsection to travel above the clearance line position of the fixed section when said bucket is discharging.

1'?. In a loader, a bucket, articulated arms pivotally supported upon the Vframe of the loader and connected with said bucket to move the latter,

Y power means for operating said bucket comprislng a first power unit to lift said bucket and connected with said arms to normally urge the bucket against said loader frame while in digging position, a second power unit to project said bucket away frdm said loaderI trip means carried by said bucket, and connected to cause said second power unitto dump the bucket, brake means connected with said articulated arms and with said power units to hold the arms in a position to per- `mit raising of said bucket by said first power means, and to automatically release said arms for actuation by said second power unit into projected load' discharging position.

`18. In a loader, a bucket, an arm connected with said bucket, a second arm pivotally supported on the loader and pivotally connected with said rst arm, a power lift means connected with said arms to raise said bucket, a power operable means connected with said arms to move the latter to project the bucket into a load discharging position, a brake connected with said arms to hold one arm in position while the bucket is raised by the other arm through the instrumentality of said power lift means, said brake acting when released to permit both arms to project said Abucket into discharging position, and a single control mechanism connected with said Ypower means and'said brake to automatically control the Vlatter and the sequence of operation of said power means for operating said bucket.

19. In a loader, a bucket, an arm connected with said bucket, a second arm pivotally supported on the loader and pivotally connected with said r'st arm, a power lift means connected with said arms to raise said bucket, a power operable -means connected with said arms to move the latter to project the bucket into a load discharging position, trip means connected with said bucket and adapted for actuation of said power operable means when said trip means is operated, a brake connected with said arms to hold one arm in position while the bucket is raised by the other arm through the instrumentality of said power lift means, said brake acting when released to permit both arms to project said bucket into discharging position, and a single control mechanism connected with said power means and said brake to automatically control the latter and the sequence of operation of said power means for operating said bucket.

20. In a loader having a bucket, bucket operating mechanism comprising a pair of pivotally connected arms, one arm being connected with the bucket and the other arm being pivotally mounted on the loadera brake'for controlling the movements of the loader connected arm, a

power lift means for raising the bucket arm and bucket, poyver operated means to rotate said loader arm` to project said bucket into load discharging position, said power operated means being connected with bucket to dump the latter, trip means for said bucket toy cause the latter to discharge its load under the action of'said power operated means, and lever controlled link mechanism connecting said brake and the power means, said link mechanism being arranged to set the brake while the bucket is being raised and to Y release the brake to allow freedom of movement of said arms whenV said bucket is being thrust into load discharging position.V

NORMAN C. WOODIN.

dumping the latter by

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