US43136A - Improvement in balanced elevators - Google Patents

Description

UNITED STATES `PATENT OFFICE.

CHARLES B. SAWYER, OF FITCHBURG, MASSACHUSETTS.

IMPROVEMENT IN BALANCED ELEVATO RS.

Specification forming part of Letters Patent NO. 43, 138, dated June 14, 1864.

T o all whom it may concern Be it known that I, O. B. SAWYER, of Fitchb irg, in the county of Worcester and State of Massachusetts, have invented a new and useful Balanced Elevator; and I do hereby declare that the following is a full, clear, and e'tact' description of the construction and operation of the same, reference being' had to the acconipanying drawings, formin g a part of this specifieation, in which- Figure l is a side elevation, and Fig. 2 an end olevation.

Like parts are indicated by the sameletters 1:1 both drawings.

The nature of m v invention consists in a certain novel combination and arrangement f a windlass and pu1leys,whereby I produce a very simple, compact, and convenient elei vator, which always balances or supports the lifted weight, without a pawl and ratehet or brake.

To enable others skilled in the art tol make and use'my improvement, I will now describe its construction and operation.

A A A A are the four sides of any suitable frame, supported by the legs B.

D is a cylindrical axle, of any required diameter, turning' in boxes in the fra1nc,() (J bei ng caps to said boxes.

E is a large pinion fast to the axlc D, by mians of which the lattcr is turned.

F is a smaller pinion, the cogs of which en` gtge with those of pinion E. This pinion F is fast to an .axle, k, which turns in suitable bearings in the frame,-as shown in Flg. 1, G being a crank by which said axle is turned by hand. In place of the handle G, however, it is obvous that a drum or pulley may bc substituted and driven by steam or other power;

or the driving` power may be applied directly to the axle D.

H is a grooved pulley, like those in general use, which turns freely on the pin n in the block or frame I.

J is a book to which weights to be raiscd are attached.

a b c is a rope or chain, one end of which is fast to the block I and the other to the axle D, as shown in the drawings.

M is a grooved wheel, which turns on its center L, the latter being fast to the axle D.

The rope or chain a b c, fast to the block I passes up over the pulley M, thence down under the pulley H, and up to the axle D, to which it is attached.

Thus (the arrows iudicating the direction of the inotion of the different parts) itis obvious that a weight attached to the hook J can be raised orlowered by turning the crank G, and also that said weight will remain balanred or supported in any position without the aid of a pawl and ratchct or brake of any descrip tion, being not only a safe, but also a simple,

compact, and powerful elevator, superior in many respccts, I think, to any known or used before. I

Having thus describcd the construction and operation of myinvention, what I claim as new, anddesire to secure by Letters Patent, 18-- The combination and arrangement of the rope a b c, windlass D, pulley H, and wheel M, as and for the purpose described.

CHARLES B. SA\VYER.

Witnesses N. AMEs, GEORGE Gnrees.

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