US1766968A - Portable hoist - Google Patents

Description

R. E. WYMAN PORTABLE HOIST June 24, 1930.

Mled May 21. 1928 2 Sheets-Sheet l lhzlenioq' label-Flynn! R. E. WYMAN PORTABLE HOIST June 24, 1930.

2 Sheets-Sheet 2 Filed May 21. 1928 an example.

Patented June 24, 1930 siren ROBERT E. VVYMAN, or BILLERICA, nassncnnsnrrs PORTABLE HOIST Application filed May 21,

The inventions herein involved relate to certain improvements in hoisting apparatus with particular reference to the general type of hoists of which the so-called gin pole is In such a hoist when rigged for the handling of materials on buildings and the like, it is important to have a light and easily moved apparatus and to have the same operable with a considerable capacity and a minimum of attendance as the labor charge in such an operation is a considerable factor, the losses and delays which are necessarily frequent being multiplied by the number of men required to operate the hoist.

In the hoist now commonly employed, it is necessary to employ a high paid engineer to operate the hoisting unit where such unit includes a clutch and brake, and where close, speed control is required. The service of such a highly skilled attendant is made necessary on account of the relativecomplexity of the mechanical power unit, and also by Union rules. 'lVhen such hoisting units are employed, it is usually necessary to employ a signal man at some distant point in order to direct the attendant in charge of the hoisting unit in starting and stopping, and also to obtain the proper speed.

Such units as those above referred to are usually bulky and are of great weight and can hardly be termed portable units in the sense intended in referring to the portable unit hereinafter described. Furthermore, even Where an electric motor has been used as the power means on hoists heretofore employed, the hoisting and lowering has been effected by utilizing a drum in which one end of the cable has been anchored, and in which a relatively large motor has been used so that it has not been possible to operate the same from the ordinary outlet'socket. Furthermore, most hoists have heretofore operated in raising and lowering by reversal of the power and the positive return of the lift has usually been rather slow on that account. It is, of course, necessary to have the material raised with the factors of power as much in favor of the power source as possible in order that the maximum load may be lifted with a reason- 1928. Serial N0. 279,410.

able minimum of power cost by thesame ratios in pulleys, and gear reduction has slowed down the return and caused the loss of time and increased the labor expense prop'ortionately.

It is the object of the present invention to produce a small light portable hoisting unit having elements thereof compactly arranged so as to occupy but little space, and adapted to be mounted 011 a substantially upright base which in turn may be detachably fixed to an upright member such, for example, as a gin pole or the like.

As illustrative of my invention 1 have shown it as embodied in a gin pole rig of simple type and this I have shown in the accompanying drawings in which Fig. 1 is a fragmentary view of gin pole with the driving hoist in place.

Fig. 2 is a plan view of the same.

Fig. 3 a view indicating the rig of such a pole in side elevation.

Fig. 4 is a side view of a modified form of drive.

Fig. 5 a plan view of the same, and

Fig. 6 a view of a pole rigged with such a modified device.

In these drawings I have indicated a usual pole consisting of a timber P which is usually braced by plank struts S to floor timbers F and suitably guyedasat G. The pole P is shown as-provided with the usual end sheave Bover which the cable 0 is run.

Myhoisting gear as illustrated in Figs. 1 and 2 consists of a base 1 which may be bolted to the pole P. To this in turn is bolted supporting bracket 2 on which is mounted a motor 3. As shown in Figs. 1 and 2, this motor is geared by a pinion 4t to a larger gear 5 on a shaft 6 on which a pinion 7 meshes witha gear 8 on the shaft 9. The shaft 9 carries the winding head 10 which is thereby driven at the desired constant speed. The cable C is given one or; two turns around the head 10 and its free end controlled by the operator. by suitable tension in taking in the cable or may be released and allowed to run free on the drum toallow an immediate drop of the lift.

In Figs. 4 and 5 I have illustrated a modified form of drive in which there is a base 1 and a bracket 2 The motor in this case 8 is provided with a worm 4 on a shaft meshing with a gear 5 on a shaft 6 on which is provided the usual drum or winch head 10.

Various other mountings and gear arrangements may be made to favor the power of the motor and to get a compact and easily rigged drive which may be quickly see up or dismounted and moved from job to job. By utilizing thisprincipie of continuous drive with the cable free on the drum, a single operator is able to handle a very large amount of material and do so very rapidly.

My apparatus is very inexpensive as compared with most hoisting apparatus and in fact so much so that two or even more may be rig ed on a building to permit the hoisting of materials at different points where construction is going on. Furthermore, the mobility of the apparatus and the simplicity of its installation makes it possible to shift it from one job to another or back and forth )etween different jobs so that a great economy in hoisting operation is secured by the contractor. My drive may be suitably housed and the manner of its support designed as desired to make it adapted to different types of pulleys or other hoisting apparatus which may be of almost any type, the gin pole installation being merely employed illustrative of the principles and use of my invention.

lVhat I therefore claim and desire to secure by Letters Patent is:

1. In a portable hoist of the winch drum type adapted tobe supported in a substantially vertical position and adapted to be operated by a single person, a base, a shaft rotatably supported near the upper end of said base, a winch drum mounted on one end of the shaft and so arranged as to extend to one side of the base and a relatively large gear mounted on the other end of said shaft, an intermediate shaft rotatably mounted below said first named shaft, a gear and pinion mounted on said intermediate shaft, the pinion being in engagement with the-first relatively large gear above mentioned, a motor, a V shaped bracket support for said motor, said bracket being secured to the base, aid motor being mounted on one of the V portions of the bracket so that the base of said motor is substantially normal to the base of the machine whereby the motor is nested to one side of the base and behind said second named larger gear, and a pinion on said motor shaft engaging said second gear.

2. In a portable hoist of the winch drum type adapted to be mounted on an upright member, a base, means for detachably securing said base to said upright member, a shaft, a pair of bearing supports mounted near the upper end of said base, the ends of said shaft extending beyond said bearing supports and beyond the base, a winch drum mounted on one end of said shaft, and a gear mounted on the other end of said shaft, an intermediate shaft, a pair of bearing brackets mounted on the base for rotatingly supporting said intermediate shaft one end of which projects beyond one of the bearing brackets and beyond the base, a pinion and a gear mounted on the projecting end of said intermediate shaft, said pinion engaging said first named gear, a motor mounted in spaced relation to the base and so arranged as to be nested to one side of said second gear, a bracket detachably secured to the base for supporting the motor so that the base thereof is substantially normal to the base of the hoist, a pinion on the motor shaft, the arrangement of the motor relative to said second gear being such that the motor pinion meshes with said second gear at one side of said second gear removed from the base whereby a compact and portable hoisting unit is obtained.

3. In a portable hoist of the winch drum type adapted to be supported on a substantially upright gin pole having a pulley at the upper end thereof, a base, means for detachably securing said base to a ginpole, a shaft rotatably supported on said base at the upper portion thereof, a winch drum mounted on one end of the shaft and arranged to extend beyond the base and to one side of the gin pole and in substantial alignment with the pulley at the top thereof, a motor, a supporting bracket for mounting said motor in spaced relation to the base, and with the base of the motor substantially normal to the base of the hoist, means for mounting the supporting bracket on the base of the hoist, and a speed reducing mech anism interposed between said motor and the gear on said first named shaft.

In testimony whereof I my signature.

ROBERT E. VVYMAN.

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