US2014910A

US2014910A - Hoisting mechanism

Info

Publication number: US2014910A
Application number: US741963A
Authority: US
Inventors: Van C Rowley
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-08-29
Filing date: 1934-08-29
Publication date: 1935-09-17
Anticipated expiration: 1952-09-17

Description

Sept 17, 1935 vA c. ROWLEY l2,014,910

HOI STING MECHANISM Filed Aug. 29, 1934 5 Sheets-Sheet l @pb l?, 1935. v. c. ROWLEY www@ HOISTING MECHANISM Filed Aug. 29, 1934 5 Sheets-Sheet 2 twv?.

Wav Maw@ @m1111935 vc, RQWLEY www I HOISTING MECHANISM Filed Aug. 29, 1954 3 Sheets-Sheet 5 Patented Sept. 17, 1935 UNITED STATES PATENT OFFICE HOISTING MECHANISM Van 0. Rowley, Pawtucket, R.. I.

Application August 29, 1934, Serial No. 741,963

8 Claims.

My present invention relates to improvements in hoisting mechanism, and has reference to devices of this character particularly adapted to be used with trucks, tractors, and other movable supports.

Automobile trucks, tractors, and the like have heretofore been equipped with fixed cranes and derrcks which have the usual swinging booms and reversing lifting mechanism. These hoisting apparatus are usually part of the truck or tractor, and do not include a complete operative mechanism independent of its support. It is the principal object of my invention to provide a complete hoisting mechanism which may be readily secured to any support, whether movable or fixed, and which may be dismantled and remounted if desired.

The standard types of truck and tractor hoisty ing equipment have been Xed with respect to the movable support, and have depended upon movement of the truck or tractor to assist the movements of the boom. It is a further object of my invention to provide a simple and inexpensive apparatus for power swinging the boom to any desired angle relative to the boom support, whereby a more exact lifting and setting control is obtained.

With the above and other objects and ad- .,vantageous features in View my invention consists of a novel arrangement of parts more fully dis-closed in the detailed description following, in conjunction with4 the accompanying drawings, and more specifically defined in the appended U claims. In the drawings:

Fig. 1 is a side elevation of the novel hoisting mechanism, as mounted on a truck, parts being broken away;

Fig. 2 is a plan View thereof, parts being bro-ken away;

Fig. 3 is a front sectional elevation of the novel power swinging mechanism, taken on the line 3 3 of Fig. 2

Fig. 4 is a vertical sectional View taken on the 'line 4-4 of Fig. 2; and f Fig. 5 is a side elevation, parts being in section, of a preferred arrangement of standard reversing mechanism used in connection With the lswinging mechanism.

I have found it advisable to provide a complete, self contained hoisting mechanism which may be readily mounted on any support, but which is particularly suitable for movable supports such as trucks and tractors. The parts are readily locked to the truck or tractor, and in- CTI clude a novel arrangement whereby the boom may be power swung horizontally, thus providing a universal type hoisting mechanism in compact portable form. This novel mechanism consists of a threaded jack shaft on which a sleeve is 5 power reciprocated, the sleeve being operatively connected to the boom so as to produce a corresponding swinging movement of the boom. I have also provided stop mechanism for limiting the power movement, to take care of possible 10 inattentiveness on the part of the operators.

A preferred constructional arrangement of the parts is illustrated in the accompanying drawings, in which the truck body is indicated by reference character II), and the self-contained hoist- 15 ing unit is designated I I. As best shown in Fig.

l, the hoisting unit includes an engine I2,preferably of the gasoline type, and two hoisting drums I3, I4 for the two cables I5, I6, with the usual clutch mechanisms I"I and I5 therefor, and 20 the usual brake controls I9 and 29, the drums being power operated through a sprocket and chain mechanism 2l.

A frame 25 is provided to support the boom, the frame comprising twosubstantially vertical 25 compression supports 26 and two tension supports 2'I, the supports being respectively hingedly connected at their lower ends to mountings 29 bolted to the truck frame at the corners thereof, as shown in Fig. 2, and being locked together 30 at their upper extremities by a through bolt 39, see Fig. l.

The two cables I5, `II pass through a block 32 which is pivotally secured to a mounting 33 secured to and between the supports 25, and 35 through a second block 34 which is pivoted on the through bolt 39; the cable I5 has an eye 36 at its end, fastened to an end yoke 3l hinged to the boom 38, and the cable I6 passes through a set of sheaves 39 hooked as at 40 over a suitable pivot 40 at the end of the boom, and carrying a hoisting hook 43. The boom 38 is preferably tubular, and has end caps 44, 45, the end cap 44 carrying a cross bar 41 to function as a pivotal support for the hook 40 and the yoke 3l, and the end cap 45 45 being pivoted to a support block or lugs 49, see Fig. 4.

Referring now to Fig. 4, the block 49 is mounted on a turntable plate 5I, which has a central hub 52, a turntable support 53 being bolted to 50 the truck frame and having an upstanding cylindrical lng 54 seated in the central hub and serving as a turning pivot for the turntable plate. A swing bar 55 is provided with an end block 51 which is. diametrically opposite the

block

49, 55

locked to the turntable plate, as by welding, whereby swinging movement of the bar 55 turns the turntable plate and swings the boom.

As best illustrated in Fig. 2, a sprocket wheel 59 is keyed to the end of the shaft 60 of the hoisting drum I3, and a reV-ersing mechanism 6|, of any standard type, is driven from the wheel 59, as by a chain 62 and a sprocket wheel 63 mounted on the gear shaft B5. The reversing mechanism is manually controlled by a shift lever 68 through a link S9, an arm 18, and a shaft 1|, and drives a threaded jack shaft I through a sprocket 16, chain ll, and a sprocket wheel 18. The jack shaft is rotatably supported in spaced brackets 8i? bolted to the truck frame, and has a threaded collar 82, see Figs. 3 and 4, mounted thereon for reciprocating movement, the collar having a circular recess 83 at the upper end in which a depending lug 84 of a rod support block 85 is pivoted, the block having a horizontal bore 86 through which the rod or swing bar 55 may slide.

The end sections of the jack shaft are left smooth as indicated at 81, see Fig. 2, to serve as limit stops, wh-ereby continued rotation of the jack shaft brings the sleeve to the smooth sections and thus stops further swinging movement of the boom.

Any type of standard reversing mechanism may be used; the preferred type, see Fig. 5, includes an arrangement such as described in U. S. Patent No, 1,942,318, granted January 2, 1934, which shows a multiple disk clutch t9, which is locked together by clutch fingers 90 when the operating lever 68 is thrown to forward position to lock the whole reverse gear as a solid coupling. The reverse drive is obtained by clamping the brake band 9| around the outside drum or casing 92, which carries the pinion gears, the drive being through the pinion gears and the outside drum. When the control lever is in neutral position, the disks and the brake band` are free and the gears run idle.

The construction and the operation of the novel hoisting mechanism is now clear. The mechanism includes a small engine, hoisting drums, a boom with a support. frame and a turntable, and a jack shaft which is power operated to swing the boom, all these parts being bolted to a truck body or other suitable support. The entire mechanism may therefore be readily installed and demounted if desired, and has a small number of rugged, sturdy, operating parts which have long life but which may be readily repaired and replaced if broken. If desired, the mechanism may be driven from the truck or tractor engine, by using a standard type suitable reduction gear arrangement.

The mechanism being mounted, the vertical movement of the boom and the housing cable are controlled by the operator in the usual manner; the jack shaft may be set in operation as desired, to suitably swing the boom before, during, or after the hoisting and setting operations, the end sections limiting the extent of the power swing.

It is thus evident that the improved hoisting mechanism has a minimum number of parts, is relatively inexpensive to manufacture and to assemble, is readily installed, repaired, and dismounted, and affords a universal portable hoist- `ing arrangement which facilitates the hoisting and the setting operations.

While I have described a preferred constructional embodiment of my invention, it is clear that desired changes in the relative arrangement of the parts, in their size, and in their operation may be made to suit the requirements for different installations, within the spirit and the scope of the invention as defined in the appended claims. 5

I claim:

1. In a hoisting mechanism, a rotatable boom support, a boom pivotally secured thereto, a thread-ed jack shaft, means for rotating said jack shaft, a threaded collar` member engaging said l0 jack shaft, and a member connected to said boom support and slidably seated in said collar member.

2. In a hoisting mechanism, a rotatable boom support, a boom pivotally secured thereto, a threaded jack shaft, means for rotating said jack shaft, a threaded collar engaging said jack shaft,

a support rotatably mounted on said collar, and a bar connected to said boom support and slidably seated in said collar support.

3. In a hoisting mechanism, a turntable support, a turntable rotatably mounted thereon, a boom pivotally mounted on said turntable, a threaded jack shaft, reversible power means for rotating said jack shaft, a threaded collar on said jack shaft, a support block swingably mounted on said collar, and a swing bar connected to said turntable and slidably seated in said support block.

4. In a hoisting mechanism, a turntable support, a turntable rotatably mounted thereon, a boom pivotally mounted on said turntable, a threaded jack shaft, reversible power means for rotating said jack shaft, a threaded collar on said jack shaft, a support block swingably mounted on said collar, and a swing bar connected to said turntable and slidably seated in said support block, said jack shaft having smooth end portions to limit outward movement of said collar.

5. In a hoisting mechanism, a turntable support, a turntable rotatably mounted thereon, a boom pivotally mounted on said turntable, a threaded jack shaft, reversible power means for rotating said jack shaft, a threaded collar on said jack shaft, a support block swingably mounted on said collar and having a bore, and a swing bar connected to said turntable and slidably extending through the bore of said support block.

6. In a hoisting mechanism, a turntable support having an upstanding cylindrical lug, a turntable having a hub rotatably mounted on said lug, a boom pivotally mounted on said turntable,

a threaded jack shaft, reversible power means for rotating said jack shaft, a threaded collar on said jack shaft, a support block swingably mounted on said collar, and a swing bar connected to said turntable and slidably seated ir said support block.

7. In a hoisting mechanism, a rotatable boom support, a boom pivotally secured thereto, a threaded jack shaft, means for rotating said jack shaft, a threaded collar member having a bore therethrough and engaging said jack shaft, and a member connected to said boom support and slidably extending through the bore of said collar member.

8. In a hoisting mechanism, a rotatable boom support, a boom pivotally secured thereto, a threaded jack shaft, means for rotating said jack shaft, a threaded collar engaging said jack shaft, a support rotatably mounted on said collar and having a bore therethrough, and a bar connected to said boom support and slidably extending through the bore of said collar support.

VAN C. ROWLEY.