US232541A - John paae - Google Patents

Description

J PAAR Lifting Jack.

A (Model.)

Y N m m )TENTOR a KM TORNEYS Pafeted sept. '21, 1880.

ovuxHoGaAPylER. WASHINGTON n c HHH!!IHIIHIIHIHIHIHUHHHHIIIIIIIIHIIIH IIHIIIHUHUHH WITNESSES CZ@ M.

JOHN PAAR, or A:New YORK,

LIFTINe-JACK.

SPECIFICATION forming part of Letters Patent No. 232,541, dated September 21, 1880.

Application led June 7, 1880.

To all whom t may concern:

Be it known that I, JOHN PAAR, of the city, county, and State of New York, have invented a-new and Improved Lifting-Jack, of which the following is a specification.

The object of this invention is to construct ajack that can be made to press both upward and downward at the same time, or to operate either upward or downward, as may be desired.

` he invention consists ofacoinbination composed of a ratchet-wheel turned by a springpawl upon a hand-lever, and held by a pawl pivoted to the standard, which standard-pawl or pressing' bar or bars, and, further, of a device for elevating or depressing said liftingbars after disengaging the pawls from the ratchet, and of a brake device for preventing the too rapid movement of said bar or bars.

Figure l represents a side elevation of the jack. Fig. 2 is a transverse section of the same on line m Fig. l. Fig. 3 is a sectional side elevation of the same on line y y, Fig. 2. Fig. 4 is a sectional side elevation of a portion of the jack, showing the device for disengaging the pawlsfrom the ratchet.

Similar` letters of reference indicate correspending parts.

In the drawings, Arepresents the standard, which is comparatively larger than the standards of ordinary jacks, for the purpose of accommodating the two lifting or pressing bars B B and their actuating mechanism, which bars B B are entered into said standard A after the ordinary manner in lifting-jacks.

On the shaft C, which is passed transversely Within the (Model.)

pawl, Gr, pivoted on a transverse shaft, G', and held engaged with the teeth of the ratchet E by means of a spring, G", which is secured to the top of the standard A. This hooked pawl G has a handle, a, which extends outward from the standard A, above the lever D, for the convenience ofthe operator.

Hrepresents the pawl-disengaging pin, passing transversely of the pawls D G, so that when the leverD is elevated toits extreme height the forked end of the pawl D will engage against said pin H, and be thereby directed against the lower and concave face standard A, are 'the large cog-wheel K, which gears into the cog-wheel F, and the small cogwheel L, which enga-ges with the teeth s s of the lifting or pressing bars B B on either .side of it, the bar B representing the liftingbar and the bar B representing the pressing-bar in this device.

On the shaft C, and outside of the standard A, is fixed a band-wheel or pulley,fM, and a crank, N, while below said shaft C and Wheel M a lever, O, is pivoted, to which lever O are secured both ends ofa band, P, which passes around said wheel M, and, in combination with the lever O, forms a brake, Q, by means of which, at any time, the too rapid reaction of the cog-wheels F K L may be prevented when the pawls D G are disengaged from the ratchet E.

In opcratin g this device the lever D is moved cog-wheels F with the etfect of raising the har B and depressing the bar B when both of said bars B B are used, this up-anddown motion of the lever D being continued the bars B B which it is often desirable to do, can press down on the handle of and thereby IOO and then by elevating thel lever D the ratchet and wheels E F K L are permitted to react slightly, and thus effect the desired object.

In order to entirely relieve the jack, the lever D is moved upward to the position shown in Fig. 4, with the effect of disengaging both pawls D' G from the ratchet E, while, in order to prevent too rapid a reaction of the cog-wheels F K L and the bars B B', the brake Q is applied to the wheel M.

The two bars B B' are rarely used at the same time; but one or the other of them is removed from the standard A and the other used, according as the object is to apply downward or upward pressure.

This device is applicable not onlyto all the purposes to which lifting-jacks are commonly applied; but can be readily and efficiently applied to pressing cotton, hay, rags, and other articles for baling, the down ward-pressin g bar A B' being especially designed and adapted for such purposes.

Having thus described myinvention, I claim as new and desire to secure by Letters Pat- 'ent- I. A compound lifting-jack constructed substantially as herein shown and described, consisting of standard A, lever D, provided with spring-pawl D', spring-pawl G, provided with the pressure of extended arm a, ratchet-wheel E., cog-wheels F K L, 'and lifting or pressing` bars'B B', as set forth.

2. In a lifting jack, the combination, with the pawl-actuated ratchet E, of the cog-wheels F K L, substantially as herein shown and described, whereby said jack may be used for upward or downward pressure, as set forth.

3. In a liftingjack, the combination, with the pawls D' Gr, the latter provided with eX- tended arm a, of the disengaging-pin H, substantially as and for the purpose described.

4. In a lifting jack, the combination, with the ratchet E, cog-wheel F, and their shaft C, of the band wheel M and brake Q, substantially as and for the purpose described.

5. In a lifting-jack, as a means for applying downward pressure, the bar B', substantially as herein shown and described.

6. In a lifting-jack, as a means for adjusting the upward or downward pressure, the springpawl Gr, provided handle, ct, substantially described.

as herein shown and JOHN PAAR.

Witnesses:

I. I. Strortn, C. SEDewIcK.

with an outward-extending

Images