US36144A - Improvement ih lifting-jacks - Google Patents

Description

To all whom it may concern.-

` vertical rack-bar,

.in the stock and fitting into the rack a.

' in Fig. l. The

above its pivot c is connected is tted in a the lever E,

a large or operating jack "the paw] D will, by

`DANIEL./rnsiogoir RowsBURG, OHIO.

immoreel ser aN Le Franc-Jacks.

Specification forming part ol' Letters Patent No. 36, Edd, datedAugust- 12, 1862.

Be it known that I, DANIEL Fnsie, .of Rowsburg, in the county of. Ashland 'and State of 0hio," have invented a new and Improved Lifting-Jack; and I do hereby declare that the following ia a full, clear, andrexact description o, the same, reference being had to the accompanying drawings, making a-part of this epecicationLin whichigure l is `a, side sectional view of my in- 1rel tion, taken in theline a: a, Fig. 2; Fig. 2, a plan or top view of the same.

Similar letters of reference indicate 'correspending parts in thetwo figures.

To enable those skilled in the art vto fully understand and construct vmy invention, I will proceed to describe it.

A represents a .socket or stock in which a B, is fitted.v and allowed to slide up and down freely. The bar B has its rack a formedl at its front side, as shown in Fig. l, and to the front side of the socket or stop there is attached a spring, C, which .has

a catch or projection, b, connected to it, said catch or projection Vpassing through ahole, c, The end of the catch or projection b is beveled, so that the teeth of the rack'a may slip past it in rising. (See Fig. 1.) The spring C .hasta tendency to keep the catch or projection b in contact with 'rack a.

On the back side of the socket or stockA there is a rack, f, into which a Vpendent pawl, D, catches. This pawl D is suspended by a pivot, c, from the front end of a lever,4 E,- which is attached by a fulcrum-pin, f, to the upper end 'of the rack-bar B, as shown clearly upper end ofthe pawl D to a rod, y,which groove in the upper surface of and vhas a knob, #hat its end. ln

its own grayty, keep engaged with the rack d.

The operation is as follows: TheA machine is eseri bed.

placed under the article to be raised, the latmovement. In order to release or let down the bar B,the operator pulls the rod g, vlhis finger behind knob h, and 'thereby throws the pawl D outward from its rack d, as 'shown by placing in red, Fig. 1. C is then pulled The upper end of the spring outward, so that the catch or projection b will be free from the rack c, andV the bar B is allowed to descend.

J The device is extremely simple, and maybe constructed at a moderate cost, of either wood or metal.' The arrangement for throwingout the pawl D from the vrack d is an important feature of bar B. l .The invention also possesses the advantage of a considerable range or length of movement of the elevating-bar B. In thisrespect it is like the common jackscrew; buti'ts move= ment is of course quickerand the device far preferable for light jacks for elevating articles of moderate weight.

Having thus described my claim as new, and desire to secure by Letters Patent, isl The combination of' the slidiiigirod g and' swinging pawlbar D with the lever'E, rackbar B, hollow rack-stock A, and .spring-catch b., as and for the purpose herein shown and DANIEL. unsre.` Witnesses: f

G. B. COULTER,- XV. M. STAMETs.

The catch or projection b of thethe invention, as it greatly l`acili`4 tates and expedites the lowering of the rack` invention,v-r'hatII

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