US2792138A - Earth handling machine - Google Patents

Description

May 14, 1957 Filed Dec. 30, 1953 FIG. I

w, c. OLSON EARTH l-XANDLING MACHINE 3 Sheets-Sheet l INVENTOR WALTER C. OLSON AT ORNEYS May 14, 1957 w. c. OLSON EARTH HANDLING MACHINE 3 Sheets-Sheet 2 Filed Dec. 50, 1953- I2 I 7 .w W o u 3 W 6 4 7%W m o w p. 9 2 w 7 o l 9 M. O 5 4. m m l 4 h 0 9 l 4 m 6 l 7 F m M O w 9 l. 4 9 8m 0 BUB m Ill! J H 6 w 7 2 9 3 l m m 1 m M a L 9 9 J r I o 6 8 w 6 4 W W E E V@ N m0 m .M 0 T A R E U A Y B b m m May 14, 1957 w. c. OLSON EARTH HANDLING MACHINE 3 Sheets-Sheet 3 Filed Dec. 30, 1953 ww mu mm 2. Q.

INVENTOR WALTER C. OLSON B ZW% QM ATTORNEYS United States Patent ie The herein disclosed invention relates to earth handling machines and particularly to the type ordinarily referred to as a hack hoe and Utilizing a wheel supported frame, a main frame pivoted thereto for swinging movement about a vertical axis, a boom pivoted to said frame for swinging movement about a horizontal axis, a bucket lever pivoted to said boom for swinging movement about a horizontal axis and a bucketcarried by the lower end of said lever.

An object of the invention resides in providing a machine of such type which is convenient to operate and Which may be quickly manipulated.

Another object of the invention resides in arranging the parts so as to procure the best lever advantage on the boom and bucket lever and to prevent interference with the proper functioning of the bucket.

Another object of the invention is to provide a construction in which substantially a full turn of the main frame may be had.

A still further object of the invention resides in providing separate extensible hydraulic pressure devices for operating said boom and lever and a hydraulic motor for rotating said main frame and in further providing separate pumps for feeding fluid under pressure to said pressure devices and said motor.

Another object of the invention resides in providing control valves for each of said pumps and in further providing two only manual control levers for operating said valves.

An object ofthe invention resides in providing pivot means for one of said levers guiding said lever for swinging movement in one direction and in further providing linkage between said lever and the valve for one of said pressure devices, whereby movement of said lever will open and close said valve.

Another object of the invention resides in providing pivot'means for the other lever whereby it may swing in any of several different directions, and in providing linkage between the valve for the other pressure device and said lever and other linkage between said motor and lever whereby one of said last named valves is operated upon movement of said last named lever in one direction and the valve for said motor is operated upon movement of said last named lever in another direction and whereby both valves are operated upon movement of said last named lever in an intermediate direction.

A further object of the invention resides in the Ispecific arrangement of the boom and the bucket lever and in the pressure devices for operating the same.

A feature of the invention resides in the arrangement of the parts whereby the center of gravity is situated as low as possible.

Another object of the invention resides in the specific construction for supporting and turning the main frame.

Other objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and/or described.

Fig. 1 is aside elevational view of a machine illustrating an embodiment of the invention.

Fig. 2 is a plan view of the structure shown in Fig. 1.

Fig.3 is an elevational sectional view taken on line 3-'3 of Fig. 1 drawn to a greater scale.

Fig. 4 is an elevational sectional view taken on line 4-4 of Fig. 1 and drawn to the same scale as Fig. 3.

Fig. 5 is a fragmentary sectional view taken on line 5-5 of Fig. 2 and drawn to the same scales as Figs. 3 and 4.

Fig. 6 is a diagrammatical view showing the control means for the machine.

Fig. 7 is a fragmentary perspective view of the control mechanism of the machine.

The construction shown in the drawings consists of a wheel supported frame having an axle anda tongue issuing therefrom and adapted to be connected to a truck or tractor. Supporting wheels are rotatably mounted on the ends of the axle. Issuing upwardly from the axle is a standard having hearings on which the main frame of the machine is-journaled for swinging movement The lower part of this frame is confined within the space between the wheels so that the frame may swing substantially throughout a complete circle, and all overhanging parts of the machine are disposed above the wheels to clear the same. The main frame consists of an'elongated base member with an upright extending upwardly from one end thereof. Pivoted to the upper end of the upright of said frame is a boom which has on its underside a depending bracket. For operating the boom, a hydraulic device is employed which comprises a hydraulic cylinder pivoted to the other end of the base member of the main frame. This cylinder has in it a piston pivoted to said bracket whereby outward movement of the piston raises the boom. The boom carries at its outer end a bucket lever which is pivoted intermediate its ends to the end of the boom. This lever has an upper arm and a lower arm and the latter carries the bucket. Between the upper arm of this lever and 3. lug issuing upwardly from the boom is another hydraulic pressure device comprising a cylinder and a piston movable therein, and which moves the bucket relative to the boom. The axle has secured to it a sprocket encircling said standard. Extending about thissprocket and a sprocket pinion journaled in the main frame is a chain. A hydraulic motor is coupled to this pinion through a reduction transmission and serves to swing the main frame and boom. A separate hydraulic pump is used for each of the two pressure units and for the hydraulic motor. The output of these three pumps is controlled by separate valves. For operating these valves, two control levers are employed. One lever is guided for swinging movement in one directionand is connected by suitable linkage to the valve for one of said pressure devices and the other is connected for swinging movement in several directions. Linkage is connected to said second valve and to said second leverand other linkage is connected to said third valve and to said second lever so that when said second lever is moved in one direction, one of said last named valves is operated, and when moved in another direction the other of said valves is operated, and when moved in an intermediate direction both valves are operated.

For the purpose of illustrating the invention, a portion of a tractor 10 has been shown, which consists of a frame 11 including an axle 12. Mounted on the axle 12 are drive wheels 13 which are driven from the engine of the tractor in the customary manner. The frame 11 includes a draw bar 14 and towhich the machine forming the present invention is attached. It will readily be comprehended that the machine may be used with any kind greater part of the weight of the machine.

bearings in position.

3 of tractor such as is now well-known in the art and for this reason the tractor has not been shown in detail.

The invention proper includes a wheel supported frame 15' best shown in Figs. 1 and 2. This frame includes an axle 16 which has welded to it a forwardly extending tongue 17. Braces 18 are welded to the axle -16 and to the tongue 17 and rigidly connect the parts together. Rotatably mounted on suitable axle shafts attached to the ends of the axle 16 are supporting wheels 19 which are preferably rubber-tired and which carry the Issuing upwardly from the axle 16 of the frame 15 is a standard 21. The standard 21 rests on a plate 38 which is carried by the axle 16 and the braces 18 and which has ribs 39 disposed between said plate and standard. All of these parts are welded together to form a rigid and integral construction. The standard is turned to receive the inner races 22 and 23 of two roller bearings 24 and 25. The race 23 butts up against a shoulder 26 formed on the standard 21. A sleeve 27 spaces the two races 22 and 23 apart while a nut 28 screwed on the threaded end 29 of said standard clamps the said races of the roller The outer races 31 and 32 of said bearings are mounted in a hub 33 which encircles the upper end of the standard 21. A cap 34 extends about the standard 21 and is secured to the hub 33 by means of bolts 35 which extend through flanges 36 and 37 formed on said hub and cap respectively.

Mounted for rotation on the standard 21 is a main frame 40 best shown in Figs. 1, 2 and 3. This frame comprises two longitudinal frame members 41 and 42 which are arranged in spaced parallel relation and which are welded to a plate 43. Plate 43 is provided at its center with an opening 44 which receives the hub 33. Plate 43 thus rests on the flange 36 of said hub and the bolts 35, which secure the cap 34 to hub 33, also pass through said plate and clamp the parts together. At the rearward ends of the frame members 42 are provided two uprights 45 and 145. These uprights have welded to the upper ends of the same diagonally positioned braces 46 and 146 which extend down to and are welded to the opposite ends of the longitudinal frame members 41 and 42. A plate 47 extending between the upper ends of the braces 46 and welded thereto ties the parts together at the upper end of frame 40 and forms a rigid construction. Welded to the ends of the longitudinal frame members 41 and 42 is a cross frame member 48 which stiifens and reinforces the base of the frame at the outer end of the same.

Extending across the upper ends of the uprights 45 and 145 is a shaft 49 best shown in Fig. 3. This shaft passes through holes 51 in said uprights and which provide bearings therefor. Mounted on said shaft is a boom 52 and through which the shaft 49 extends. This boom is preferably constructed from a pipe or length of tubing and is bored transversely to receive said shaft. Sleeves 53 on said shaft between the uprights 45 and said boom hold the boom centered between the uprights. Collars 54 are secured to the ends of said shaft and hold the parts in assembled relation. By means of this construction the boom is pivoted for swingingmovement in an up and down direction, Extending downwardly from the inner end of the boom 52 is a V-shaped bracket 55 which has welded to the vertex of the same a lug 56. Lug 56 has pivotally connected to it the piston rod 57 of an extensible hydraulic pressure device indicated by the reference numeral 58. The cylinder 59 of this device is similarly pivoted to a lug 60 securedto the angle frame member 48 and shown in Fig. 4. It will be readily comprehended that when fluid under pressure is directed into the cylinder 59 and in back of the piston thereof, that the boom 52 may be raised to various positions indicated in dotted lines in Fig. 1, and when the fluid is directed into the other end of said cylinder the boom will be lowered.

Disposed at the outer end of the boom 52 is a bucket lever 61. This lever is constructed of tubing similar to the boom 52 and has welded to it two spaced plates 62 which extend longitudinally of the same. The outer end of the boom 52 is received between these plates and a pin 63 extending jointly through said plates and boom support the lever 61 for swinging movement at the end of the boom. This construction forms in the lever 61 a bucket arm 64 and which is disposed below the boom and an operating arm 65 which is above the boom. The arm 64 terminates in a yoke 66 which is pivoted by means of pintles 67 to a bucket or scoop 68 of conventional construction. This bucket has teeth 69 at its leading edge and is formed at the rearward portion of the same with a lug 71. Lug 71 has pivoted to it a link 72 which in turn is pivoted to a lug 73 which is welded to the boom 64. The link 72 is of a suitable length so that the bucket engages the earth at the desired angle whereby the bucket may be readily filled as the boom and bucket lever are manipulated. The lever 61 is operated by a hydraulic pressure device 76 which comprises a cylinder 77 having a piston traveling within the same. This piston is connected to a piston rod 78 extending outwardly of the same. The piston rod 78 is disposed between the plates 62 on lever 61 and a pintle 79 passing through the said plates and rod pivotally connect the piston rod to the upper operating arm 65 of the bucket lever. The cylinder 77 is connected by means of a pintle 81 to a lug 82 welded on the upper side of the boom 52. In this manner the device 76 is connected to the boom and the lever. Upon directing fluid under pressure in the cylinder 77 and in back of the piston therein, the lever 61 can be swung from its extended position as shown in full lines in Fig. 1, and to its other extreme position as shown in the dotted lines indicated by the reference numeral 83. By directing the fluid into the other end of the cylinder the lever is swung in the opposite direction. For the purpose of rotating the main frame 40 the following construction is employed: Encircling the standard 21 is a ring sprocket wheel 89 which is supported by a number of struts 91 extending upwardly from the axle 16 and from the braces 18 of the wheel supported frame 15. These struts are welded to said frame and also to the said sprocket wheel so that the same is concentrically disposed with reference to the axis of the standard 21. Attached to the longitudinal frame member 41 by means of bolts 92 is a bearing 93. This bearing supports for rotation a vertical shaft 94 which has mounted on it a sprocket pinion 95. A chain 96 passes over this pinion and over the ring sprocket wheel 89. A sprocket wheel104 is also mounted on shaft 94. Adjacent the shaft 94 and parallel to it is another vertical shaft 97 which is journaled in a bearing 98 attached to the frame member 41 by means of bolts 99. This shaft is further journaled in a bearing 101 mounted on a bracket 102 also secured to said frame member 41. The shaft 97 has mounted on it a sprocket pinion 103. A chain 105 passes over the sprocket wheel 104 and the pinion 103 and effects a drive for the shaft 94 from the shaft 97. Shaft 97 has also mounted on it a sprocket wheel 106. A chain 107 passes over this sprocket wheel and over a sprocket pinion 108 attached to the shaft 109 of a hydraulic motor 111. Motor 111 is secured through a lug 112 to the bracket 102. When the motor 111 is supplied with fluid under pressure, the same rotates and turns the shaft 109 which rotates shaft 97 and which in turn rotates shaft 94. This causes the entire frame 41 to rotate relative to the frame 12 and to swing the boom about the standard 21 as an axis.

For operating the hydraulic pressure devices 58 and 76 and the motor 111, three hydraulic pumps 113, 114 and 115 are employed. These pumps are mounted on brackets 116, 117 and 118 attached to the diagonal brace 46 by welding as best shown in Fig. 5. The pumps 113,

114 and 115 are conventional and may be of any suitable type capable of pumping a liquid to a relatively high pressure. An ordinary gear pump or :a vane type pump may be used for the purpose, and such construction being well-known in the art has notbeen shown in detail in the drawings. These pumps have drive shafts 119 and to which are attached sheaves 121, 122-and 123. For driving these pumps an internal combustion engine 124 is employed which is mounted on 'a'support 125. This support is attached to the braces 46 and 146 of the main frame 40 and is supported through legs 126 resting on the cross frame member 48 of said frame. The engine 124 has a crank shaft 127 on which is mounted a multiple groove sheave 128. Three belts 131, 132 and 133 pass over this sheave and are disposed in the respective grooves thereof and also pass over the sheaves 121, 122 and 123. These belts simultaneously drive all of the pumps 113, 114 and 115 from the engine 124.

For supplying liquid to the various pumps 113, 114 and 115, a tank 154 is employed which is attached to and supported to the upright 45 of the frame 41). This tank has suitable connectors 155 secured to the same near the bottom thereof and to which sections of hose 156 are connected. These sections of hose in turn are connected to the inlets 157 of the pumps 113, 114 and 115.

The operator of the machine is seated on a seat 129 which is mounted on a tubular pedestal 134 having a flange 135 at its lower end. Issuing downwardly from the seat 129 is a supporting rod 141 which is received in the pedestal 134. A set screw 142 serves to hold the said rod supported in adjustable position to vary the height of the seat above platform 136. The flange 135 is mounted on a platform 136 attached to the longitudinal frame member 42 of the frame 40 and secured thereto by means of bolts 138. A band of steel 137 is welded to the edge of the said platform and also to the upright 145 and to the longitudinal frame member 42. A brace 139 extends between the pedestal 134 and the flange 135 and serves to stiffen and reinforce the same.

The output of the pumps 113, 114 and115 is controlled by means of valves .147, 148 and 149. These valves are mounted on the brace 146 of frame 40 and on a plate 143 welded thereto. Cap screws 144 extend through this plate and the said brace and are screwed into the said valves. These valves are identical in construction and the construction thereof being well-known in the art the valves have not been shown in detail. The valve 148 has an inlet 151, a return outlet 158 and two feed outlets 162 and 163. The inlet 156 is connected by means of a length of hose 152 to the outlet 153 of the pump 113. The return outlet 158 of the said valve is connected by means of :a length of hose 159 to a fitting 161 attached to the top of the tank 154. This hose serves as a by-pas's for returning the liquid from the pump 113 and which is not used for operating the device controlled by the valve back to the tank 154. The feed outlets 162 and 163 of the valve 148 are connected by means of lengths of hose 164 and 165 to the ends of the cylinder 77 of the hydraulic pressure device 76. The valve 148 is operated by means of a reciprocable rod 166 which can be moved inwardly and outwardly of the valve. This rod controls a valve head and which is provided with suitable passageways and cooperating ,with ports in the body of the valve communicating with the inlet 151 and the outlets 158, 162 and 163. By the proper arrangement of the porting and passageways in the valve head, the valve functions to control the flow of fluid into either end of the cylinder 77 and cause the piston rod 78 of the hydraulic pressure device '76 to move inwardly or outwardly. At the same time, the fluid in the opposite end of the cylinder is returned to the valve 148 where the same together with the fluid not used in the operation of the device 76 is returned back to the tank 154 through the hose 159. The cylinder 59 of the hydraulic pressure device 58 is similarly connected to the valve 147 and the motor 111 is likewise connected to the valve 149. It will thus be comprehended that these hydraulic pressure devices and motor are separ-ately actuated through the respective pumps and may be independently controlled by the proper operation of the rods 166 thereof. I

For the operation of the valves 147, 148 and 149, t'wo operating levers 167 and 168 are employed. These levers are mounted on 'a fnamework 169 best shown in Fig. 3. The said framework includes an upper frame member 171 which is Welded at one end to the upright of the main frame 40. The other end of this frame memher is connected to a post 172 which in turn rests upon the platform 136 and is welded to the band 137. The lever 167 is attached to the end of a shaft 173 which is journaled in bearings 174 secured to'framemember 171.

T his shaft has attached to it an arm 175 which in turn is pivotally connected to a clevis 170 attached to the valve operating rod 166 of valve 147. As the said lever is moved in a back and forth direction, the said rod is reciprocated and the flow of liquid into and out of the cylinder 59 controlled. For supporting the lever 168, a shaft 176 is employed which is journaled in a bearing 177 attached to the frame member 171 and in another bearing 178 attached to the upright 145. This shaft has secured to it at one end an arm 179 which is pivotally connected to the valve operating rod 166 of valve 147. The other end of this lever has secured to it a clevis 181 which straddles a flattened portion 182 at the end of lever 168. A pin 183 extends through this clevis and lever and supports said lever for swinging movement in a lateral direction. At the same time the bearings 177 and 178 support the shaft 176 and a lever 168 for swinging movement in a back and forth direction. The lower end of the portion 182 of lever 168has pivoted to it, by means of a pin 184,

-a clevis 185 whichin turn is pivoted through a pin 186 to another clevis 187. The pins 186 and 184 are disposed at right anglesto one another. Clevis 187 is secured to a link 188 which in turn is secured to another clevis 189. This clevis straddles an arm 191 of a bell-crank lever 192. Lever 1192 is pivoted on a stud 193 attached to a bracket 194 which in turn is secured to the upright 145. The lever192 'has another arm 195 and which is straddled by and pivoted'to a clevis 196. This clevis in tu'rn'is secured to the rod 166 of the valve 149. It will readily be comprehended that when the lever 168 is moved in'a back and forth direction shaft 176 is rotated and the rod 166, operating valve 148, is moved in a back and forth direction. When, however, the lever 168 is moved laterally, link 188 is also shifted laterally, the lever 168 pivoting on the pin 183. This moves the bell crank 192 and shifts the -rod166 of valve 149 in aback and forth direction. If the lever 168 is moved in an intermediate direction, both valves are operated and the flow to each of the devices controlled thereby is determined by the particular direction in which the lever is moved.

The method of using the machine is as follows: The operator is seated on the seat 129 and faces in a rearward direction where a clear view of the boom and bucket may be had. The movement of the bucket is controlled by the lever 168 which is operated by the right hand. The movement of the bucket relative to the boom is controlled by the lever 168 which is'operated by the right hand. When the lever 168 is moved away from the operator, the bucket also travels away from the operator, and when the lever is moved toward the operator the bucket moves toward the operator. When the lever 167 is moved away from the operator, the boom is lowered'an-d when the said lever is moved toward the operator, the boom is raised. Correspondingly, when the lever 168 is moved toward the right, the main frame supporting the boom and bucket rotates to the right, and when said lever is moved toward the left the main frame and boom is swung toward the left. Thus movements of the two levers are such as would readily occur to the operator in procuring movement of the bucket. By using separate pumps for each hydraulic pressure device, the devices can be independently or simultaneously operated. In this manner, manipulation of the bucket is extremely rapid and the earth is quickly removed and dumped where desired. When any of the valves 147, 148 and 149 is operated by manipulation of the rod 166 thereof, the following events occur: Normally the valve is so positioned that the flow into the inlet 151 of the valve is by-passed from the outlet 158 and through the hose 159 back into the tank 154. When the rod 166 is pulled in one direction, fluid flows through one of the feed outlets 162 or 163 and enters one end of the cylinder with which it is associated. The rapidity of flow depends upon how far the rod 166 is pulled out. When the said rod is moved in the opposite direction, flow occurs through the other of said feed outlets and into the other end of the cylinder. In both cases, where the valve is not fully open, the balance of the fluid pumped by the pump is by-passed back to the tank 154 from the return outlet 158. The same occurs with reference to the motor 111 which may be operated in either direction depending upon the position of the operating rod 166 for the valve 149 thereof.

The advantages of the invention are manifest. The machine is easily operated and the bucket can be simultaneously moved in several directions by the various hydraulic pressure device for operating the same. The parts are so arranged that the operator does not need to remove his hands from the operating levers since there are but the two levers, one for each hand. The movement of these levers to procure the desired movements of the bucket are suggested by the movement of the bucket so that no confusion arises when the operator wishes to operate the machine. The hydraulic device for raising the boom is so arranged that the fluid for creating pressure in the cylinder is introduced in the end of the cylinder opposite to that from which the piston rod projects. In this manner the benefit of the pressure against the full area of the piston is procured and the high pressure necessary to raise the filled bucket and boom is not directed to the end of the cylinder having the stufiing box or gland. The same is true with the hydraulic pressure device for the bucket beam. The movement of the filled bucket or the movement of the bucket in becoming filled is controlled by exerting pressure on the end of the piston opposite to that from which the connecting rod issues. With the instant invention, the boom can be swung through an angle of 360 degrees when raised above the tractor to which the machine is attached. The machine can be easily and quickly attached to a tractor, thus not requiring power driven wheels and can hence be made sufficiently light to permit of easy maneuverability.

Changes in the specific form of the invention, as herein described, may be made within the scope of what is claimed without departing from the spirit of the invention.

Having described the invention, what is claimed as new and desired to be protected by Letters Patent is:

1. In combination, a wheel supported frame, a main frame pivoted thereto for swinging movement, a boom pivoted to said main frame, a first hydraulic pressure device acting between said main frame and boom, a first pump connected to and actuating said hydraulic pressure device, a bucket lever pivoted to said boom, a bucket carried by the end of said lever, a second hydraulic pressure device acting between said boom and said bucket lever, a second pump connected to and actuating said second hydraulic pressure device, a hydraulic motor, transmission means driven by said motor and swinging said main frame, a third pump connected to and energizing said motor, first, second and third valves control ling the output of said first, second and third pumps, :1 first control lever connected to and operating said first valve to control the raising and lowering of the boom, 3. second control lever, universal pivot means supporting said second lever and guiding it for movement in a back and forth direction and in a lateral direction, linkage connected to said, second valve and to said lever and operable upon back and forth movement of second lever to procure back and forth movement of said bucket lever, and other linkage connected to the third valve and to said second lever and procuring swinging movement of the main frame and lateral movement of the bucket lever upon lateral movement of the second control lever.

2. In combination, a wheel supported frame, a main frame pivoted thereto for swinging movement, a boom pivoted to said main frame, a first hydraulic pressure device acting between said main frame and boom, a first pump connected to and actuating said hydraulic pressure device, a bucket lever pivoted to said boom, a bucket carried by the end of said lever, a second hydraulic pressure device acting between said boom and said bucket lever, a second pump connected to and actuating said second hydraulic pressure device, a hydraulic motor, transmission means driven by said motor and swinging said main frame, a third pump connected to and energizing said motor, first, second and third valves controlling the output of said first, second and third pumps, a first lever pivoted for swinging movement in a longitudinal direction, linkage between said first lever and said first valve and causing movement of said boom toward the frame upon movement of the lever in the same direction and movement of the boom away from the frame upon movement of the lever in its opposite direction, a second contr'ol lever, pivot means for guiding said second lever for movement both in a transverse and in a longitudinal direction or in either thereof, linkage connected to said second lever and to said second valve and causing longitudinal movement of said bucket lever toward said fame when said second lever is moved in a corresponding longitudinal direction, and away from said frame when moved in the opposite longitudinal direction, and other linkage connected to said third valve and to said second lever and causing swinging of said boom laterally in one direction when said second lever is moved laterally in the same direction and causing swinging of said boom laterally in the opposite direction when said second lever is moved laterally in its opposite direction.

3. In an earth handling machine having a wheel supported frame, a main frame pivoted thereto for swinging movement, a boom pivoted to said main frame, a first hydraulic pressure device acting between said main frame and boom, a first pump connected to and actuating said hydraulic device, a bucket lever pivoted to said boom, a bucket carried by the end of said lever, a second hydraulic pressure device acting between said boom and said bucket lever, a second pump connected to and actuating said second hydraulic pressure device, a hydraulic motor, transmission means driven by said motor and swinging said main frame, a third pump connected to and energizing said motor, first, second and third valves controlling the output of said first, second and third pumps, the combination of a first control lever connected to and operating said first valve to control the raising and lowering of the boom, a second control lever, universal pivot means supporting said second lever and guiding it for movement in a back and forth direction and in a lateral direction, linkage connected to said second valve and to said lever and operable upon back and forth movement of the second lever to procure back and forth movement of said bucket lever, and other linkage connected to the third valve and to said second lever and procuring swinging movement of the main frame and lateral movement of the bucket lever upon lateral movement of the second control lever.

4. In an earth handling machine having a wheel supported frame, a main frame pivoted thereto for swinging movement, a boom pivoted to said main frame, a first hydraulic pressure device acting between said main frame and boom, a first pump connected to and actuating said hydraulic pressure device, a bucket lever pivoted to said boom, a bucket carried by the end of said lever, a second hydraulic pressure device acting between said boom and said bucket lever, 21 second pump connected to and actuating said second hydraulic pressure device, a hydraulic motor, transmission means driven by said motor and swinging said main frame, a third pump connected to and energizing said motor, first, second and third valves controlling the output of said first, second and third pumps, the combination of a first lever pivoted for swinging movement in a longitudinal direction, linkage between said first lever and said first valve and causing movement of said boom toward the frame upon movement of the lever in the same direction and movement of the boom away from the frame upon movement of the lever in its opposite direction, a second control lever, pivot means for guiding said second lever for movement both in a transverse and in a longitudinal direction or in either thereof, linkage connected to said second lever and to said second valve and causing longitudinal movement of said bucket lever toward said frame when said second lever is moved in a corresponding longitudinal direction, and away from said frame when moved in the opposite longitudinal direction, and other linkage connected to said third valve and to said second lever and causing swinging of said boom laterally in one direction when said second lever is moved laterally in the same direction and causinging swinging of said boom laterally in the opposite direction when said second lever is moved laterally in its opposite direction.

References Cited in the file of this patent UNITED STATES PATENTS 1,722,585 Manley July 30, 1929 1,823,137 Fundom Sept. 15, 1931 2,224,725 Felt Dec. 10, 1940 2,418,299 Gorsuch Apr. 1, 1947 2,468,201 Hoover Apr. 26, 1949 2,625,280 Currier et a1. Jan. 13, 1953 2,648,231 Windahl Aug. 11, 1953 2,674,500 Hukari Apr. 6, 1954 2,676,719 Wagner et al. Apr. 27, 1954 2,678,140 Goetz May 11, 1954 2,698,697 Holopainen Jan. 4, 1955 2,700,904 Woods Feb. 1, 1955 2,702,137 Ives Feb. 15, 1955 FOREIGN PATENTS 613,190 Great Britain Nov. 23, 1948 667,798 Great Britain Mar. 5, 1952

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