US2379599A - Power hoist - Google Patents

Description

c. RSMITH POWER HOIST July 3, 1945.`

` 3 Sheets-Sheet l v Filed April 13, 1942 Z- Y@ Hm,

yJuly 3, 1945.

130mm H0131' Filed April 13, 1942 3 Sheets-Sheet` 2 July 3 1945- 5 c. R. SMITH 2,379,599.

" POWER HoIsT Filed April 13, 1942 3 Sheets-Sheet 3 Patented July 3, 1945` v e v Y noLWERHoIs're ffm lohiilt,smith,nicegaiu,' Y l applicati-mamaria; ima-serialNaffiaam s claires; (01.212451.)v

"if This'linvention Vrelatesft'o vimprovenients jin power 'hois'ts and more particularly to ltraversing hoists adapted for builders and roofers usa-al'- 'though capabieof a uvariety' of` other uses. L This ffinvention may -be considered "a `further developnienty of my tro-pending application for Hoists,

"No-2,305,201 'granted vDecember 15, i942.

v"One objectjjof the invention is'tofprcnvidev a power 'hoist wherein" the" Weight "of the in'otorr `serves to substantially" offset `or 'counterbalance the weight of lthe load being'raised thus avoiding an otherwise possible topheavy condition @and contributing materially.v to safety in operation, the'jmotor being fm'o'unted tothe `boom `to swing with the load. "'A furtherobje'ct is lto provide a 'power hoist *thattmay `be started or stopped and its speed regulated, lor the brakes Yapplierdby"aflsin'gle controleerd, the 'brakes being automatically 'applied when the control lever is released.4 l

V .An son further and `very imoortaotjobjectis fto provide 'a powerhoist lwherein the nsectional frame .may bereadily oarriedto 'and erected upon .a jpoint of considerable "elevation by; 'one-man the motorjthereafter `:raised from the 'ground ofi" other 'point 'below the frame 'to the Vroof or high'point wholly underitsown power .and fat alltime's `under"comp1et`e rcontrol of the" operator, 'andthere' readily 'afiixedkt'o the vframe'in workin'g. position. I The motors used infpower hoists are of very considerable weight and vordinarily are `quite vdiiiicult 'to raise to' lpoints 'above fthe ground without'the'usel'of derricls ortlie like, butfinthe present instance this condition Vvis not 'foundas the motor is adapted tofbejraised 'endlo-wer'ed readily by its own power.4 y vA` still further object jisto provide fa power v4hoistfof vg'rea`;i'.'lifting power Vlthat' is of 'few parts, readily lalsseinb'led and, dismantled`, yrugged f and 'durable in'v vconstru'ctitm', positive 'emcient in operation, that is vautomatic: 'inlman'y features, 'and that 'calls for but little attention 'and eiort on the'partofj thel operator.l 't

"with the foregoing and other objects the 'invention consists in thev combination and ai'ran'gementof jparts*` to be 'hereinafter fullyA de- `scribed, pointed out in itheclaims and illustrated thefaccompanying drawingsy which V"forni 'a partpf *this patent, and in which- Eig; jl vis aside'view ofthe powerjhoist wherein the motor visshown 'as 'being 'risecl'under its own powerl "from -'a `position fbut recently upon the Lv'like' Structure."

, ground-1ro that-ofthe"hermano-p' a. lmii'idnrg.orl

in 4View f Fig. 2 is an venlarged fragmentary -view ofrig. '1

showingthe clutch `lever or control xlever and iuelicontrol' means, the lever and connections being show-n i-n-three positions; e i `Fig. 3 is a side view' of the motor with yits frame, an altered position being' shown 'infdotted lines. f

Fig. 4 is a vertical sectional View through Fig. 3, on the line l#JL-looking in the -direction o'f the arrows. l

Fig. vv5 is a View 'in lperspective fof' the 'braise bands and connections employed. Y

` 'Arranged at the apex of the triangle is 1the`socke't- Fig. f6 is -adetail vertical sectional view through a `pulley employed.` l n l Fig. 7 A*is a viewVinperspective-oi the sectional hoist frame.

'FigBJlis an enlarged detail view Vin sidejelevat'io-'n-= cifan' adjustable boomextension farm the pulley and trip -employed.

Fig '9'1is afront view olf Fig. =8^with` thewtrip omitted, i and Fig. 1 0v is aside View lco'mple'ate Vhoist plicatien. f

on a reduced scaleof the Like referenceeharacters denote *correspond` ing partsytliroughoutl the several views.v

The power' hoist 'includes a 'sectional yrhein frande`su`bstantially triangular in vshape andfcoinf v posed ofhthe 1base 'I rand sides 2; 2 Aconnectedby the'bra'ce 3 and "provided with-cross braces A4; 4.

1 '5 provided withabracket `6 to which is 'pivotallv secured the upper `end `of kthe leg Vor .truss bar '1 l.

that rval', its '1o-wer Aend carries a weight' rest' to rec'seivea'weight 9k to anchor the frame'. Received in the upper end of thev socket 5`fis the downturnedend ofthe boom l0 adapted 'to be moved substantially horizontally through an arc of 180degrees or 1ess ,"said boom 'beingco'riiy nec'ted yby a vertical bra'cell and the 'stemfjZ of a head I3 toa boom brace 'I4 vthat has its'in ner end pivotally received lin the socket "l5 arranged upon the said :brace `3, said lhead1? being fast upon lsaid lboom inwardly fi'omjthe freeend thereof. lThesoclzet I carries a bracket "i6 con'- nected by a bar H to a collar I8 Nadjust'ably farvranged upon said leg `l. Theframe, lleg 'and'boom Vmayfloe disconnected lfrom each other when de-I isiredfas when shipping the "hoist "or when it is noty in use.` By adju-'sting the'leg Arelative lto "the frame the latter may be caused to stand perpen'- Idicu'larprat 'an angle to 'the perpendicular.'

The powerunit includes la frame iorrnedof vtwofside members, each of lwhich -cornprisestt'wo Yvertical 4tubularfffrierribers I9 --cormected byfa jupon 'a roofs, illustrating its ap" brace 20 intermediate their ends and by front and rear tubes or bars 2|, 22 at their lower ends and by a rear top bar 23. The lower ends of both side members are supported in angle pieces 24 that extend rearwardly therebeyond as at 25 as clearly shown in Figs. l, 3 and 10. Stub shafts 26 carried by said angle pieces have the wheels 21 loose thereon. Arranged upon the upper ends of the said side members are the forwardly extending angle pieces 28 that kconverge at their forward `extremities and are extended to form the tongue 29 provided at itsforward end with an eye 3D to permit it to be drawn by a truck sion El, said sides being separated by spacer sleeves Bla about the connecting bolts, said trip fork normally resting upon a stop 62 upon said extension, said extension being adjustably secured to the boom I8 and to the brace i4 by bolts 63 passing through the sides of said extension and upon opposite sides of said boom and brace. When in adjusted position the extension is rigid but when the bolts are removed the extension may Vbe adjusted relative to the boom and brace as may be desired and'the bolts then ,replaced to lock the extension. Aipulley B4 provided with .awheel hanger 85a is mounted at the free end when desired. Spaced braces 3l connect said ings 32 for the shaft 33 of the rope or cable drum 34 that has its central portion of greater diameter than the ends to which said central portion is tapered, so that the cable wound thereupon Willbe wound uniformly thereover. The drum 34carries upon its ends the brake drums 36, 31 provided with the brake bands 38 connected by grips 39 to the control bar 48 the ends .of which are journaled in bearings arranged -upon said angle pieces 28, one end o f said control bar being connected by link 4l and rod 42 to the control lever 43 loose upon said shaft 33.

, Fast to one angle 28 is the cam 44 that is loose about said shaft 33 and that is adapted for engagement with the cam lugs 45 of the lever 43, said lever abutting the shaft nut 46. Loose upon shaft 33 is the clutch member 4l adapted when in engagement with the drum 36 to drive the rope drum 34 and shaft 33 movable longitudinally in bearings 32.

As shown in Fig. 2 the extreme right hand dotted line position of the lever 43 is its normal position. The clutch is running freely upon shaft 33 and the brakes are applied by brakeY band connections, the bands being tight upon `the brake drums. In the full line or intermediate position of said lever the brakes are oi or free and the clutch runnnig free. In the left hand dotted line position of said lever the brakes are off and v said lever through engagement of its Cam lugs 45 with the cam face of cam 44 has moved the cable drum with brake drums longitudinally of shaft 33 into operating engagement withthe clutch 41 which is connected by sprocket chain 48 with the lsprocket gear of the shaft 49 of the motor 50 supported upon the frame bars 2i, 22.' This latter position of lever 43 is running position and just prior to it assuming this position the motor throttle 52 is opened Wide, from idling position, by means ofthe throttle connection 5| connecting said throttle and lever. Connecting said clutch and brake drum is thev expansion coil spring 53 that yieldingly retains said members in disengaged relation. The speed of the cable drum and consequently of the load is controlled by manipulation of lever 43 by the operator with said lever in running position.

l Secured to one vertical side memberl i9 is a bracket 54 to which one end of a spring 55 is securedgto connect same to abell crankl 56 fulcrumed to an angle 28, one arin of said bell crank being reduced and by said spring being yieldingly retained in engagement with a pin 5'! carried at the end of lever 43 to retain the same in running position when desired.

Also engaging saidbell crank' is a. chain 58 connecting same to a trip fork 58 vmounted for pivotal movement to a bolt 6|) connecting .the sides of a substantially L-shapecl boom extenof said yboom extension and provided with a rope guide 65 mounted to a `floating hub 66 received within the pulley hub, said guide being adjustable to any desired position and then locked by bolt 6l, two positions of said guide being shown in Figs. 8 and 10. When the hoist ls operated upon a roof or elevation a control cord 68 connected to lever 43 and passing over a sheave 68 that is carried by a bracket 'lll depends therefrom. n

The end of the control cord 68 terminates in a loop 1l. Depending from the angle 28 is a bracket 8l that carries a sheave 88 over which va cord 89 passes to the bell crank l56, the free end of said cord terminating in a loop 90. Detachably secured to the rear ends of the angles 28 and extending transversely of the motor frame is the inverted U-shaped bail 18, the free ends ofthe sides of which are biiurcated and bolted to the staples 19 of the motor frame. Carried centrally of the base of said bail is the staple 80 for engagement by the hook 8l carried at one end of the cable 82 that passes between the tines of the trip fork 59 and over the pulley 64 to the cable drum 34. An eye-bolt 83 welded to the base of the bail 'I8 in line with staple 80 is engaged by chain'84 that passes through the staple 85, of tongue 29, also in line with staple 88, said chain being provided terminally with a hook '86.

The lever 43 is retained in normal position by the spring' 13 having one endsecured to tongue 29 and the opposite end to a bracket 14 depending'from the control bar 40. When it is desired to raise the motor by its own power from a position upon the ground or below the roof to the sectional frame upon a roof 98, or vlike'elevation, the'hook 8| is placed in the staple 80 and the hook 86 is engaged with the chain 84 at the proper point to prevent vertical oscillation of the motor, the forked terminations of thesides ofthe bail 1B engaging with the staples and angles 28 preventing lateral tilting of the motor which might otherwise occur as the cable 82 is wound back and forth over the cable drum `as the lifting operation proceeds.

The hook 9| of ground cable 92 is nowplaced in the loop 98 of cord 89. The operator upon the ground now manually moves the control lever 43 from normal to running position where it is retained by the bell crank 56 and connections and the ascent isstarted. As the cable 82 iswound upon the drumv the motor is raised from the ground. Aslit movesV upwardly to a point at which it will clear the roof'and firewall the operator pulls upon the cord 92 from his position upon the ground. rl'his causes cord 89 to disengage the bell crank from the lever 43 which moves into normal position, disengagingthe clutch, as the brakes` are automatically set and the vload haltedj The load, with boom l0, is swung hori- Lzontallyto bring the motor over the roof. 'I'he lever 43 is now manipulated to gentlydeposit the motor upon the roof. 'I'he hook 8| lis now reto operating position and the tongue secured to the head I3, or said members 1, |1 may be again replaced after the frame and motor are in operative position.

In operative position they channel-shaped tongue 29 of the motor frame receives or ts down over and upon the boom It with a thickened or reinforced portion 99 of said tongue resting upon the socket 5 at which point the 2 greatest portion of the weight of the motor is borne, the forward end of said tongue fitting snugly over the head |3, a pin |90 being then passed through a perforation in said tongue that registers with a perforation 93 in said head and the motor and frame are iirmly secured in operative position. To lower the motor again, when desired, the pin |90 is withdrawn and the motor manually held in place while leg 1 and bar I1 and the motor let down upon the wheels 21. 'I'he leg 1 and bar |1 of the sectional frame may be replaced and the motor may again be connected to its lifting gearing and lowered. The boom extension, previously described, serves among other things to permit moving the motorwith its frame y being normally connected together in full extended position by a pin 16a, the lower leg section being provided with a perforation 1Gb tov receive said pin 16a when the sections are partially telescoped to shorten the leg. The topmost end of the leg is square to snugly nt the What is claimed is:

1. In a power hoist, a frame, a motor carried thereby, a cable drum carried by said frame driven by said motor, a pulley, a cable upon said drum passing over said pulley, an inverted U-shaped bail having its ends secured to opposite sides'of said frame, a staple disposed centrally of the base of said bail engaged by said cable, an eyebolt disposed centrally of the base lo of said bail, a second staple carried by said .frame inline with said eyebolt, a chain connecting said eyebolt and passing through said second staple, and a hook carried by said chain for sechannelled tongue while the lower endis pro- 4 boards ||l| are then placed upon the bar 11 and frame bars 2|, 22 and weights placed thereupon to anchor the machine in position.

When the motor is used in position upon the sectional supporting frame the leg 16 is disconnected from the tongue and weights 9, |03, or either of them, are placed in position as shown in Figs. 1 and 10. To raise a load 94 by its bail 95 the hook 8| is engaged therewith, the cable 82 being wound upon the cable drum. To raise a very heavy load the back gear or tackle 96 is employed, the hook 8| being secured to a staple 91 secured to the end of the boom l0. The load is now somewhat more'slowly but readily raised. From the staple v91 the cable passes about the sheave of the tackle, through the trip 59 and over pulley 64 4to the cable drum. A collar 1| upon cable 82 contacts and raises the trip fork 59 when the load 94 is lifted to a certain maxlmum point.

lective engagement with the links thereof.

2. In a power hoist, a frame having a tongue, a motor Kcarried by said frame, a cable drum carried by said frame and driven by said motor, a pulley, a cable upon said drum passing over said pulley, an inverted U-shaped bail having its 0 ends secured to opposite sides of said frame, a

staple disposed centrally of the base of said bail engaged by said cable, an eyebolt disposed centrally of the base of said bail, a second staple carried by said tongue, a chain connecting said eyebolt and passing through said second staple, said eyebolt and staples being disposed in a common plane, and a hook carried by said chain engaging a link thereof.

3. In a power hoist, a frame including a boom, a cable drum, a clutch therefor, a motor connected thereto, a second frame carrying said cable drum and motor mounted to said iirst named frame, brakes for said cable drum, a lever forl said clutch, -means connecting said lever and brakes for yieldingly retaining said lever in normal position and applying said brakes, a bell crank carried by said second frame engaging said lever in running position to releasablyv anchor same, a pull cord for said bell crank, a pulley carried yby said boom,l and a cable upon said drum passing about Said pulley.

4. In a power hoist, a frame including a boom, a cable drum, a motor connected thereto, a second frame carrying said cable drum and motor and mounted -to said rst named frame, a pontrol lever for said cable drum, an extension arm adjustably carried by said boom, a trip fork carried by said extension arm, a rest for said trip fork carried by said extension arm, a pulley carried by said extension arm, a cable upon said drum passing about said pulley, a trip collar carried by said cable, and connection between 4 said trip fork and control lever.

5. In a power hoist, a frame including a swinging boom, a cable drum associated therewith, an extension arm adjustably secured to said boom, a pulley carried by said extension arm, a cable guide for said pulley, a motor for said cable drum, a trip fork carried by said extension arm in line with said cable guide, a trip fork rest carried by said extension arm, a cable upon said drum passing about said pulley through said cable guide and trip fork, connection between said trip fork and motor, and a trip collar carried by said cable.

6. In a power hoist, a swinging boom, a support therefor, a pulley carriedby said boom, a cable drum, a motor therefor, a frame carrying` said cable drum and motor for detachable application to said boom, and a cable upon said drum passing about said pulley for connection to said frame in one position thereof and for connection to a lload in another position thereof relative to said boom.

CHARLES R. SMTH.

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