US309002A - Island - Google Patents

Description

Unrrnn Smarts arnsrr FFKCE; I

JUDSO N SPAULDING, OF PROVIDENCE, RHODE ISLAND.

DEVICE FOR HOIST ING AND LOWERING WEIGHTS.

EJ'PECIPICATION forming part of Letters Patent No. 309,002, dated December 9, 1884.

Application filed October 13, 1884. (No model.)

To all whom it may concern:

Be it known that I, JUDSON SPAUL'DING, a citizen of the United States, residing at Providenee, in the county of Providence and State of Ithode Island, have invented certain new and useful Improvements in Devices for Hoisting and Lowering W'cights; and I do hereby declare the following to beat full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and

to letters or figures of reference marked there on, which form a part of this specification.

My invention relates to windlasses adapted to be used in hoisting and lowering weights; and it consists, essentially, of a suitably-mounted sleeve or bushing carrying a ratchet and short lever-arm, the latter having pivoted thereto a supplemental crank-lcver provided with a cam-shaped projection adapted, when hoisting, to frictionally engage a wheel secured to the end of the drum-shaft, said shaft passing loosely through the ratchet and arm. The crank-lever is further provided with an extension, also adapted to frietionally engage said wheel as a brake when employed in lowering the weight. A spring connects the arm and crank, all as will be more fully hereinafter set forth.

The object of the invention is to produce a more efficient and less expensive combined frictional hoisting and lowering device than has been made heretofore. 1

In the accompanying drawings, Figure 1 represents a plan view of a hoisting arrangement embodying the invention. Fig. 2 is a front end view showing the levers and frictionwheel in position for hoisting a weight. Fig.

3 is a similar view showing the position of the lever in lowering the load; and Fig. 4; represents a plan view of Fig. 2, also showing the bearing'cap removed and the sleeve in cen ,tral horizontal section.

The following is a description of the invention and the manner of its operation.

A, referring again to the drawings, designates the shaft, provided with a drum, 1), and rope cl, the rear end of the shaft adapted to revolvelin the bearing E, secured to aframin g, T, as common.

13, Fig. 4, is a sleeve or bushing revolving in the bearing E,having the ratchet C formed at its inner end, the opposite or front end of the bushing having a short arm, D, secured thereto. The shaft passes loosely through this bushing, and projectstherefroni in front for the purpose of carrying the frictionwhecl F, and to which it isrigidly secured.

H designates the operating lever or crank, which is fulcrumed at e to the arm D, the upper portion, H-, of the hub thereof being camshaped, and adapted to engage with the periphery of the wheel F; The lower portion of said hub is elongated to form the curved arm H,which extends under and partially around the friction-wheel, its concave surface being lined with leather, Z, or other suitable material,

and adapted also to engage the periphery of the wheel F, all as fully shown.

Secured to the end of the arm D is a spring, 8, which extends along the back of the crank H, its free end resting upon a lug or pin, 8, the object of this spring being to overcome the unbalanced portion of the crank at any position, and at the same. time to release the cam H from the frictiouwheel after the pressure upon the crank has been removed.

The operation is as follows: \Vishingto raise a bucket of water or other weight secured to a cord, d, and drum D, the handle it of the crank H is grasped by the operator and. revolved ahead in the arrow direction, Fig. 2, which movement first overcomes the resistance of the spring s, thus causing the cam H to impinge against the wheel F, when, new, by continuous revolutions of the crank,the load is hoisted, the ratchet O and its pawl c adapting it to be suspended at any point as common, the crank then standing relatively to the Wheel F as shown in Fig. 2, the elongation H not being in contact with said wheel. As the weight or resistance is increased, so also in proportion is the bite or pressure of the surfaces in contact of the said cam and wheel increased. If, now,the load is to be lowered, the crank is first vibrated slightly in the opposite direction, which overcomes the resistance of the spring 8, and at the same time releases the cam from contact with the frictionwheel. The load now begins to fall,and so continues until gradually brought to rest by means of increased pressure applied to the crank, (in the arrow direction, Fig. 3,) which causes the ICO surface Z of the brake H to bear against the 1111- der side of the friction-wheel,all as fully shown in said figure. As the pressure upon the crank is removed,the weight begins to descend in an increasing ratio. The operator, however, is enabled to control its descent, and even to stop the load at any desired point.

It is obvious that the improvement herein shown and described is adapted to be used in any ordinary hoistingmachine, although it is more especially designed to be combined with the drum, ($50., of well-curbs. I contemplate, however, its adaptation and use with a conr pound or geared hoist for heavy weights, such as cranes, 85c.

I do not claim, broadly, a frictionally-connectecl combined hoisting and lowering device; but i What I do claim, and desire to secure by Letters Patent, is-

' 1. The combined hoisting and lowcringdcvice herein described, consisting of a sleeve or bushing suitably mounted, having secured or formed thereon a ratchet and lever-arm,

the latter having fulcrumed thereto a springconnected crank provided with a cam-shaped projection and brake-arm, in combination with a drum-shaft and friction-whee], said wheel being secured to the end of the shaft which passes loosely through said bushing, whereby the cam and brake are adapted to frictionally engage said wheel in hoisting and lowering, respectively,substantially as shown and set forth.

2. The combinati0n,with the pivoted crank H, provided with the cam H and brake H, and loosely-mounted hollow arm D,carrying a spring, 8, of the friction-wheel F, secured to the end of the driving-shaft A, substantially as shown, and for the purpose set forth.

3. The bushing or sleeve B, with its ratchet G and arm D,suitably mounted, provided with a spring, 8, and fulcrum e, in combination with the crank H, having a cam, H and brake H formed thereon,whereby a shaft passing loosely through the longitudinal axis of said bushing and carrying a 1riction-wheel,F,is adapted to revolve in either direction,substantially as shown and set forth.

In testimony whereof I have affixed my sigo nature in presence of two witnesses.

" JUDSON SPAULDING.

\Vitnesses:

GEO. H. REMINGTON, E. E. BAKER.

Images