US400150A - weston - Google Patents

Description

3 Sheets-Sheet 1.

(No Model.)

T. A. WESTON.

- HOISTING MECHANISM.

Patented Mar. 26, 1889.

I T/wmwiffstom By law Attorney Nv PETERS. mlflhngnphlr. Wahingtoo. 5.0.

(No Model.) 3 Sheets-Sheet 2.

T. A. WESTON.

HOIfiTING MECHANISM. No. 400,150. Patented Max:226, 1889.

- Lt; E 3:?

E :0 & 'n M' z I -4J/- z iii 4 \liii? 3' WITNESSES INVENTOR 3% 6 Thom J. Weaz'ovq Wm), y 7116 -l y (No Model.)

3 Sheets-Sheet 3.

T.- A. WESTON.

HOISTING MECHANISM.

Patented Mar. 26, 1889.

WITNESSES UNITED STATES PATENT OFFICE.

THOMAS A. IVESTON, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE & TOIVNE MANUFACTURING COMPANY, OF SAME PLACE.

.HOISTING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 400,150, dated March 26, 1889.

Application filed April l4 l lSBB.

To aZZ whom it may concern:

Be it known that I, THOMAS A. WESTON, of Stamford, in the county of Fail-field and State of Connecticut, have invented certain new and 5 useful Improvements in Hoisting Mechanism,

of which the following is a specification.

My invention in sun-and-planet geared portable and fixed hoisting mechanism is the sub ect-matter of a division of a pending ap- TO plication filed by me in the United States Patent Ofiiee October 10, 1887, Serial No.

251,953, employing a corresponding general arrangement of the main partsthat is to say,

the main lifting-sheave placed within the machine between the two frame sides and upon the hollow shaft, the driving-pulley exterior to the frame on one side of the machine, and a system of sun-and-planet gearing exterior to the frame on the other side of the machine by which I obtain a compact and symmetrical construction of a sun-and-planet-geared hoist with the minimum of friction and with the load-chain and suspension-hook very nearly in the vertical central line of the machine; but in place of the self -checking and brake devices shown in said application I combine with the driving -sheave the safety lowering device of my United States Patent No. 320,317, granted June 16, 1885, and to the internal annular gear-wheel of the sun-and-planet gearing I apply an external brake, making the said wheel separate from the frame and capable of free rotation thereon. Further, where itis desired that the main lifting-sheave be driven by a ratchet-connection with its shaft, I employ a peculiarly strong pawl and pivot of novel form.

My invention consists in the organizations of parts, which I will now describe in detail, and then succinctly specify in my claims.

Figure 1 is an elevation of the geared side of my improved hoist. Fig. 2 is a vertical transverse section. Figs. 3, at, and 5 represent my improved ratchet-connection applied to the shaft B and main sheave A.

A is the main or lifting sheave, keyed to its hollow shaft B. A suitably-fitted lifting-chain, with an attached hook, as usual, (not illustrated,) is placed upon the sheave A. The 56 hollow shaft B is carried by suitable bearings in the frame sides D and E.

Serial No. 270,706. (No model.)

P within the disk-box and ratchet-wheel P,

and thus couple together the driving-pulley C and shaft 0, disks P, and ratchet-wheel P. The pawl P hung to the frame side E, prevents backward motion in the ratchet-Wheel P. The shaft 0 has made integral therewith the pinion C engaging with the planetpinions B, which latter turn upon studs or pivots B carried by the flange B of the hollow shaft B.

13 is a ring or frame attached to the flange B, the better to support the pivots B The pinions B also engage with the internal annular gear-wheel, D, which is capable of rotation upon the bearing D upon the frame side D. The periphery of the wheel D is embraced by a brake-strap, D.

D is the brake-lever, fulcrumed upon the projecting end of the cross-head andi'ramestay F.

D is a strong spring of any convenient form secured to the frame D, whereby the lever D 85 is pressed continually, so as to strain the attached strap D around the brake-rim of the internal annular gear-wheel, D, sufficiently to prevent its backward rotation even under a maximum load.

To the long arm D of the lever D a cord, D, is attached, for convenience in pulling off the brake-strap D. Upon releasing the brakestrap D sufficiently by its lever D, so that any load upon the hoist begins to descend, 5 the accompanying backward rotation of the sheave A, shaft B, and flange B will carry the pinions B around the now stationary pinion O the said pinion C and its shaft and the driving-pulley 0 being frictionally locked IOO together and pawled to the frame by the pawl P, as already explained. The said backward rotation of the pinions ll" around the now iixed pinion Ll impels the internal annular gear-wheel, I), with them in the same direction against the l'n'ake-strap with a n'lultiplied velocity. The larger number of revolutions thus made by the internal annular gearwheel, 1), over those of the hollow shaft and main sheave adds largely to the efficiency and controllingpower of the brake-stra rendering very easy the control of the load by the lever l) and cord D". Upon the latter being released. by the operator the spring D resumes its action upon the strap and arrests the deseentot' any load suspended upon the hoist. Slow or safety lowering is effected by overhauling backward the hand-chain upon the driving-sheave (3.

In this construction of a su1'i-a1u.l )lanetgeared hoist I have thus coi'nbincd in one machine a slow and safe lowering action with a more rapid one, but one easily controlled, each device being always available for use at the instant it is rm uired.

I have illustrated my invention as embodied in a portable hoist or geared pulley-block; but it is also ol'iviously adapted fora stationary frame attached to a crane or other support.

The periphery of the main lift-ing-shezitve I have shown as formed to engage with the links of a pitcleclntin; but it may, where dosi rei i, have a smooth eyl indrical exterior suited for coiling thereon a rope, or it may be toothed to engage with the teeth of a rack-lifting bar as a substituted device for reaching the load to be overcome, all these being usual and well-known devices and therefore not illustrated.

Figs. 3, l, and 5 represent a ratchet device applicable to the sh aft 1- and sheave A, so as to provide the facility for running rapidly upward the chain and hook when unloaded by pulling upon th eslack or u n loadedend thereof.

Fig. :5 is an elevatitm showing the sheave A in section.

Fig. 4 is a side elevation of the sheave A and internal ratchet-teeth, the pawl in dotted lines.

5 is a side view of the pawl-disk and parts carried thereon.

The sheave A is loose upon the shaft l3, and kept in place bet ween the solid collar I; and the pawl-disk A the latter being keyed to the shaft B.

A is a circle oi. internal ratchet teeth formed within the side flange of the sheave A. l'pon the side of the disk A a projection, A, is cast to support the mwl-pivot A" at its exposed end against yielding to the pressure of the pawl A. The pawl A' has an. open bearing at its end, by which it seated upon the upper exposed side of the pin or pivot A", and it is kept to its seat by the small screw A, passed through an ear or thin eontinuation of the pawl side extended over the outer circular end ot the pivot A', as shown in Figs. 3 and 5. A spring, A, of any convenient form is used to hold the pawl to the teeth in the usual way. This construction of pawl, pawl-pivot, and support furnishes compactness and maxim um strength in the pivots, where such devices are usually weakest.

I claim as my own invention- 1. The combination, with a hoist-frame, of a driving-pulley provided. with a safety lowering device exterior to the hoist-frame upon one side thereof, a train of sun-and-planet gearing provided with a friction-brake exterior to the hoist-frame upon the other side thereof, and a main litting-sheaiive within the hoist-frame, substantially as set forth.

2. The combination, with a hoist-li'rame, of a driving-pulley, 0, connected by a safety frictional lowering device with the driving shaft 0, a ratchet-wheel, l, and paw]. or check device, I, and a train of gearing provided with a friction-brake, substantially as set forth.

3. The combination, with a hoist-frame, of a gearing consisting of the driving-sheave O, driving-shaft C, having pinion (1 pinions B", pivot-ed to the driving-flange l3, annular wheel I), and a brake whereby the said internal annular gearwheel is frictionally coupled with the hoist-frame or released therefrom, hollow main shaft B, attached to the flange 13 and journaled at each end in a bearing in the hoistirame, and a lilting-sheave, A, attached to the shaft 13, substantially as set forth.

4. The combination, with the shaft-l3, oi? the sheave A, provided with the il'iternal ratchetteeth, A, and loose upon the shaft, a collar, 15, and the pawl-disk A provided with the projection A and keyed to the shaft 1- and the pivoted spring-pawl A, substantially as set forth.

In testimmiy whereof .I have hereunto subscribed my name.

THUS. A. \Vl Lf'lUN. itnessesz Scnuvnn Min-atria, (mo. 1E. Wnrrn.

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