US2493242A - Scaffold hoist holding means - Google Patents

Description

Jam 3,1950 H. s. cal-:ER

SCAFFOLD HOIST HOLDING MEANS 3 Shets-Sheet 1 Filed DSG. 13, 1947 Jam 3, 1950 H. s. GEI-:R 2,493,242

scAFFoLn aoIsT HOLDING MEANS Filed nec. 13, 1947 :s sheets-sheet 2 IN VEN TOR.

v Zia/'ff' 666/1 Jan. 3, 1950 Filed Dec. 13, 1947 H. S. GEER scAFFoLD Hoxs HOLDING MEANS 5 Sheets-Sheet 3 INVENTOR.

Patented Jan. 3, 195o 2,493,242

SCAFEOLD HOIST HOLDING .@MEAN'S `"Hobart-1S. 'Geer,1Jackson H'eiglitsNY., assigner 'to The F-PatentfScafolding "1560 Inc., '-Long lslandfCity, f-a corporation-of New'lYork ApplicationDecemher 13, .l947,. Serial,No.--791,590 Aff?. Claims. (Cl. 'M -528) "l ;2 This 4"invention""r'elates i to scaiiold 'hoists Yarid Y sides .of .whch,.;a,pinl 29. extends. .The .sleeve ,'2Ii `more*palticularly.toclutchesfor` the same. ,alsovh-as aslotliat .each side thereof. Aforked Heretofore,..scabld hoistshaveusedwormtand lhandle with forksi32 hasa vslotSI, for freedom wormggear connections-for controlling the action omovementin respect tothe pins 29 on theA plate fthe vinnding;drum. '.'Ihemeansior'operatng "'5 ".28. .Thehandleis secured to--a pin 3.1i .passing 'the 4.woi'mhaveV not`b.een..too safe, and it'is one .through.thes1ots 3.5 of .the sleeve .25, which pin `fthe ,objects:dfthisinvention to improve. such 253,4 passeslhrough acircular. slot or.ho1e Ia..,in operatingmeanszso `astOIincreasethe safety of 'theishaftld ..Thefree end .Sticfthehandlet Uthe same. Lhasa hand-.portion".31 at right4 .angles thereto.

heinvention :consists of an improved clutch 11) ...A helicals'pring 38has oneend, pressing .against gon'it'he,iwormsshaft,consistingof twqparts .each the .end.39..ofjthe sleeve ..2ii,.,and itsotherend in "having "teeth vwhichengage .eachother,. one of ,pressing against a .washer il .on the shaft Iii.

'saidgparts'beingiformdinto a Asleevehaving a ,which-.washeni 4ahutsfagainsta pin 42 secured "bracket with aliinI passingthrough'a slot of the '.tolthe end of theshaft. .Thefspringtends to hand1e,"'the'hand1e1beingpivoted to `the;shaft,.on i5 .pushthefsleevel. in adirection ,to keep the teeth Whihrahelical.spring iis disposed, 'the spring ofthesleeves,intermeshing When sointermeshteridingto'causelthe teeth otthefsleeve'to ymesh ng,lthe :handle -30 is. in inward or inclined 'posi- WithLtheteethoflthe Worm sleeve, andLthe-handle tion as shown in full lines.in-.Fig..1. -Whenthe being operated .against-the .actionoffthe spring, handleis soinclineditwould, if` rotated, by the .fthe handle `when in onepositionlbeing prevented 1reason.of;the..worm-connection, abut against some `from rotating'by the frame f' thelhist, and-when `.partei the frame .of .the hoist, andthus-Devent in ,theothen .being free to rotate without ob'struclfurther.. rotation. tiorf'by'the"hoist"frame. -Ifitlis desired .to cause Ythe hoisttofdescehd in The invention-ewilldbetiurther:described em- .the-'manner.wellknowrlfthe handle `ISsmoved bodiments of the same will be shown in the draw- .from itsobliquenposition to a position perpendicu- *ingsfarfdthefinvention'willfbeiiinallyipointedout .lar to'.f.the.shaftlunas. shown in-d0ttedlines in in the claims. Fig.-1,.whereby.the.sleevezt. is drawn away so as In the accompanying-drawings, to free the teeth from each other,and"the spring Fig. 1 is a side View of a scaiold hoist frame `38is..confipressed .Thenthe Worm ll.can.be opwiththe improvement embodied therein; -.erated.bythe rotation of .the .handle Y3d, bythe rFigiZfis"apartialfrontvievsrof`r a framefwith ..rotation-..df. the` shaft I 0. the-11 improvementrembodiedrtherein; nreleaseof thehandle, the spring V35 forces mvilig. Brisan-enlarged -section-of therimprovethe sleeve 22 back to its intermeshingposition, ment, taken 0n line 3 3 0f Fig, 1; and the handle back to its oblique position.

Fig. 41s a fragmentary view showing the intera5 The improvement described is applied to the meshing teeth, and handle Operated Sleeve; known Scaffolding hoist. This Consists 0f a. frame Fig. 5 is a side view of another embodiment of 5U, only one side wall of which is shown in Fig. 2. my improvement; and The lower part of the frame 59 is secured to its Fig. 6 is a section taken on line 6-6 of Fig. 5. companion member (not shown) by tie bars 5l, Similar characters of reference indicate correand the upper Dari/S are Secured together by a tie sponding parts throughout the various views, bar 52. A shaft 53 having its ends rotatable in Referring t-o the drawings, (Fig. 1), the worm the frame 50, has a pinion 54, which meshes with shaft I0, has a worm ll, meshing with a worm the gear 55 0f a disc 56 forming part of a drum gear l2, as known. 51 upon which a cable is wound (Fig. 2). Upon The improvement consists in Securing to the 45 'the Outside Of the diSC 5S, paWlS 53 are Secured worm shaft I0 adjacent to the worm I I, a clutch Which are Dressed by Springs 59 against a ratchet member I3 consisting of a sleeve I4 having one 60 1005915 munted On the Shaft 6I of the drum end I5 in a plane perpendicular to the shaft It, 51, the shaft 6l being Supported by the frame 5l). and the other end I6 provided with teeth I1, each In the embodiment, the ratchet 6i) is made a part having an inclined part I8, and a shoulder part I. of a member 62 having the Worm gear l2y Which A sleeve 20 has at one end 2|, teeth 22 to regmeshes with the worm II. The disc 56 is integral ister with the teeth I1, each tooth having an nwith the drum 51. clined part 2| and a shoulder part Isa. The sleeve When it is desired to raise the hoist, the shaft 'fil 20 has its bore 23 concentric with the shaft Il). is rotated by the pinion 54 anticlockwise, as The sleeve 20 has a depending plate 28 from both 56 shown by the arrow 60a (Fig. 1), which permits the pawls 58 to ride on the ratchet teeth 60, and causes the worm gear to rotate the worm Il, the teeth l1 simply riding on the teeth 22 of the clutch. When it is desired to lower the hoist, the shaft I is rotated by the handle 30, which is held in the dotted line position shown in Fig. 1, whereby the teeth I1 and 22 are out of engagement.

The improvement consists in the provision of the toothed sleeve 20 slidable on the shaft l0 having a supporting bracket 28 to which the handle 30 is pivoted, which handle 30 is pivoted to the shaft I0 by the pin 34. By the movement of the handle 30 to vertical position from its inclined position as shown in full lines, the bracket 28 is moved, outwardly, to a distance against the action of the spring 38, sufficient to disengage the teeth 22 from the teeth I1, which enables the worm Il to be rotated by the shaft l0, when lowering the frame 50.

In Figs. 5 and 6 is shown an alternate form, wherein the spring is placed in another position, the parts otherwise operating as described.

In the embodiment shown in Figs. 5 and 6, the sleeve 20 to the rear of the shaft ID has two lateral rearwardly extending members 22a, each having a slot 35. Within these members 22a, a helical spring 38a surrounds the shaft I0 and has one end seated against the inner part of the sleeve. A disc 4| surrounds the shaft I0, and abuts against the other end of the spring 38a. A pin 42 passes through the shaft lll, and the disc 4I` abuts against it. The members 42a extend downwardly to form a bracket 28a each having a slot 3Ia, for the movement of the pin 29a therein, which pin is secured to the handle yolks 32. These yolks are pivoted to the pin 34 passing through the shaft lil, the slots 35 permitting movement of the sleeve 22 with its members 22a in respect to the pin 34.

The mode of operation of the modified embodiments is the same as the embodiment of Figures 1 to 4. When the handle 39 is in the full line position of Fig. 5, the teeth engage each other. When the handle 30 is moved from the full line to the dotted line position, then the sleeve 22 with its members 22a has been moved so as to disengage the teeth, and the spring 38a has been compressed thereby tending to again intermesh the teeth.

I have described several forms of my invention, but obviously various changes may be made in the details disclosed without departing from the spirit of the invention as set out in the following claims.

I claim:

1. In a scaffold hoist brake having a worm shaft and a non-rotatable housing for the worm shaft, the combination of teeth on said housing, a sleeve mounted slidably on said shaft, teeth on said sleeve for meshing with the teeth of the housing, a. bracket on said sleeve, a handle pivoted to the Worm shaft and pivotally connected with the bracket, and a helical spring surrounding the shaft and pressing the sleeve teeth towards the teeth of the housing, the outward movement of the handle compressing the spring and moving the sleeve to disengage the teeth of the sleeve from the teeth of the housing and permit rotation of the worm, the release of the handle and its inward movement by the pressure of the spring moving the sleeve, and engaging said teeth and automatically locking the worm, against rotation.

2. In a scaffold hoist brake having a rotatable worm shaft, and a non-rotatable housing for the worm shaft, the combination of teeth on said housing, a sleeve mounted slidably on said shaft, teeth on said sleeve engageable with the teeth of the housing, a bracket on said sleeve, a handle pivoted to the worm shaft and having a slot pivotally connected with the bracket, a cross pin on the worm shaft to which said handle is pivoted, a helical spring surrounding the shaft and pressing the sleeve towards the teeth of the housing, and compressed by the outward movement of the handle, and a cross pin on the worm shaft to hold one end of the spring from moving, the outward movement of the handle moving the sleeve outward to disengage the teeth, and permit rotation of the worm shaft during the lowering of the hoist, the release of the handle permitting the spring to move the sleeve and engage the teeth and lock the shaft to the housing, to automatically brake the downward movement of the hoist, in the event of loss of control by the operator.

HOBART S. GEER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Dina May 3. 1932

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