[1]Patented Jan. 15, 1929. l@699,480 UNITED STATES PATENT OFFICE. PREDMUCK 01. SNOW, JR., OF WINCHESTER, XASSACHUSETTS, ASSIGNOR TO MEAD, NORRISON XANUFACTURING COXPANY, OF EAST BOSTON, XASSACHUSETTS, A COUPOR&TION OF XAINE. PORTABLE HOISTING MECHANISX. Application ILled April 22,1925. Serial Wo. 25,116,. This invention relates to hoisting mechand more particularly to portable hoisting mechanism such as may be carried on a self-propelled or other vehicle. a The iilvention is shown for illustrative purposes as embodied in a portable automobile hoist adapted more particularly for the handling of poles to be erected or removed, but it may, either in the illustrated or io some modified form, have various applications -to other uses. The iiivention will be best understood by reference to the folowiiag description when taken in connection with the aceompanymg 15 illustration of one speci-fic einbodiment thereof, while its scope will be more particularly pointecl oiit in,the appended claims. In the drawings)- Fig. 1 shows a typical motor vehicle of 20 the truck type equipped with a hoisting derrick @mbodying one form of the invention; Fig. 2 is a plan view of a portion of the chassis sh6wing the meins adopted for 25 bracing the intermediate leg I of the derrick when supported on the vehicle; Fig. 3 is a side elevation in partial section of the bracing means shown in Fig. 2; Fig. 4 is a sectional elevation taken 30 through - the sheave support at the junction of the intermediate aiid side brace legs of the derriek; Fig. 5 is a side elevation showing the sheave support And the attachment of the 35 side legs to the truck; attaelt,me-ultsof the several legs of the derrick to the ttuck; Fig. 7 illustrates the adaptation of the 40 derrick to the lifting of a load close to the rear end of the track; Fig. 8 illustrates its adaptation to the lifting of a load further removed from, the rear of the -truck; and 45 Fig. 9 shows,th6 jack attachment for tbe. truck's rear end. Referring to the drawings and to the illustrative embodiment of the invention, I have there shown as -representative of a typical 50 self-propefled vehicle the automobile,truok 11 which is equipped with the usual driving mqtor and steering and contrc,lling mechanigin, and has the chassis franic 13 aiid body iloor 15. Mounted on auR sditable part of the truck, and herein for purposes of illus- 55 tration at the forward part of the body to the rear of the driver's seat, is the winch or winding druni 17 operated from the driving motor through any suitable power take-off (not shown), the winch being of any usual 6o construction and having the usual controlling devices (not shown). The described vehicle is arranged to cai-ry a collapsible derrick of the middle or tripod type compri-9in the two inclined side legs@, 65 19 and 21 whic% are detachably secured by their hook-sliaped ends 23 to a rod or bar 251 the latfer supported at the rear of the truck by brackets 27 bolted to the transverse I-beam 29 fastened to the rear o' the truck. 7o Tlie'der rick further comprises the intermediate or shiftable leg which is composed of a tiibular member 31 having a telescopically containe d lower end 33 pivoted to the bolt 35 between ears 37 earried by a foot 6r rest 75 39 having a preferably flat bottom. The telescop ic 6nd 33 is provided with a series o-f perforati ons adapted to be brought singly 'mto registration with a perforation on the tubular member 31, whereupon, with the 8o aid of the pin 40, the leg may be lengthened or shortened to adapt its length to different positions with the foot resting on or off the truck, this being accomplished without -the needed pr-ovision of additional or extra 85 , parts. The upp@er ends of the three legs are capable of temporary coniiection and afford ' urnal support for a sheave 41 and guide 'o ose the upper end of the intermediate letas secured ihereto the forked carrier 45 ""rr ng the tubular member or sleeve 47, whicyhi is fixedly secured thereto as by a driving fit th6rein. T-he fixed sleeve 47 9.5 serves as a journal bearing for the sheave 41 and also carries the guide block 43 which is formed of two plates separated at opposite- ends by the pacing members 49 and 51, the lower one Of which may serve as a beel-et loo or attachment for the end of the hoist rope or cable when a double purchase is required. The block is capable of a turning movement on the sleeve 47 so as -to adapt itself to dif - ferent angulai positions of the hoisting 105 cable. The side legs 19 and 21 have secured to their upper ends respectively the terminal, F' 6 ' a rear elevation showing the block- 43, as shown in Fig. 4. For this pur- 90
[2]1,699,480 members 53 and 55 so shaped that. while the side legs may -preserve their angular ilaiesent flat clination, the terminal members p. i@terior faces 6pposeld, to the sides of the ,a forked carrier and eiforated to receive the ends of the sleeve 4@ s'o as@ to have a swiveling movement thdreof. When the terminol members of the side legs; are slipped over the projecting ends of the fixed sleeve 41' io they may be iinited into x single striietui-e wiih the intermediate leg by meaiis of the bolt 57 w,hich passes through the sleea,e and is secured therein by the nut 59. Thi-ougli the connecting bolt the side legs 15 may be attached to or detached fi-om the intermediate leg at will, the sleeve 47 which serves exclusively as the sheai,e journal i-emaining iri the forked carrier at all times, and the sheave carrier, guide block and 20 sheave being preserved as an integral.unit at sucli times as the side legs are detaclied tberef rom. When the intermediate le(y is positioned to be supported by the t,ruck Che foot@ may rest 25 on the floor thereof but provision is preferably made whereby the st@ain received by the leg is transmitted directly to the chassis frame. This object may be secured in any su'table manner, but herein there is pro30 vided a brace rod 61 (Figs. 2,and 3) at eacli side of the chassis, bolted or'otherwise secured at its lower end to the cliassis frame 13 and hoving a slope or angle approximating that had by the intermediate le,, in the 35 position of the latter when supportea by the truck. The two brace rods converge toward each other and are united at their upper ends by the bolt. 63 so as to form a Vshaped 4o brace, carrying at their point of union the link 65. When the leg 31 is positioned f o@r SU]pport on the truck it is placed over the slot 67 in the floor, the link 65 is swuna up and secured between the ears 37 bv the pin 45 69 (as indicated in full lines in Fig. 3), the floor being thereby relieved of the strain transmitted through the leg 31, which strain is taken directly by the chassis frame. When the leg 31 is to be shifted to a po@ 5o sition off the truck, the pin 69 is remov6d, and the link thereby detached is aflowed to swing down to the dotted line position (Fig. 3), leaving the truck floor without obstruction. The two brace rods 61 may be con55 nected by the tic-rod 71 prnvided with the spacing sleeve 73. The method of utilizing the derrick is illustrated in Fig. 7, where the truck, for.ili@e ptirpose of illustration, is shown baelc again@t 60 the curb of a street or in pioximity to t,l'te. load to be raised, which is representod. by the pole 75. In this position the rear of the truck is preferably supported by a pair of screw or other jacks 77 which rest on the 66 ground or other adjacent support. To secure a direct and convenient support for the leg-braces 19 and 21, the extensible member 79 of eact e i jack has snvivel cl to tlle end thereof the SUPP()rting bi-acket 81 (see F'I(r. 9) liaving overttirned ed(res by means @i 70 AN,Iiieh the suppoi-t inay be slid over tl)e ends of th.e I-beain 29@ ,ind secured to the sides thei-cof, tlius providincr a dii-.ect rest or reinforeement forltlie I-@'eam and the legs, the jaclcs being suitably adjusted by raising the 75 extensible member to such appropriate liei(rlit that the load is received directly on tile jack. The detachable bracket 81 permits the jacks to be fastened to the I-beaill and to be suspended therefrom so that if desired 50 the truck may have its position,shifted more o.r less while the jaclcs hang suspended therefrom. When the derr@ick is i-eady for use ea(@li jaclc, if needs be, may be adjusted sothat its foot approximately- touclies the 85 ground. When the load is taken by the de'rrick it is transmitted througli the side leos to the I-beam, depi-essing the rear of tile i7eliiele and causin- each jack to seat itself firmly on the ground. Theswiv-elin(, con- %)O nection to the bracket 81 assists each ja to adapt'itself to slope oi- unevenness in the grouidad. if desiredi the jacks may be inc,,ne siightly in a direction toward the load to be lifted so as to act as sprags and brace 03 the veliiele against longitudinal cesplacement when the load is taken by the derrick. The de@rri6k bei@g set U with the foot 39 secured to the link 651 tee hoisting cable is run over the sheave 41 @nd attached to 1-00 the pole or other load, and the winch operated to raise the same. If it is desired to secure a double purchase a block may be placed in the bight of the hoisting cable and the end of the latter secured through a io5 hook to the becket 51, the block being connected to a i-ope or cable secured to the pole. If the line of lift is at a substantial distance to the rear of the load (as represented in Fig. 8), the fo6t 39 may be disconnected 110 froin the link 65 and the leg 31 shifted to a position wi.th the foot resting on the ground or o,ther support extraneous of the track, and the h6isting thor, I lowerliag operation performed wit parts in that position, the 11,5 length of the leg 31 being first adjust,6d by the requirod amount through its adjustable telescopic connection to the end piece 33. During the. travel of the truck or at such times as the hoisting device is not required, 120 the derrick may be taken down, the legs &8counected and the parts stowed on tiie b'wlt in any corveinient place. In erecting 'tb6,,&rrick on the tru6k it may be conven.1@@ily assembled with the ends of the legs 12.4 to be joined resting on the ground at the rear of the truck, -the side legs being hooked about the rod 25 and the bottom of the intermediate leg lying loosely on the truck floor. The hoisting cable is then run through the pufley 230
