US513155A - Lifting-jack - Google Patents

Description

(No Model.)

` A. L. STANFORD.

LIFTING JACK.

' No. 513,155. Patented Jan. 23, ,1894,

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ARTHUR L. STANFORD, vOF EVANSTON, ILLINOIS.

LIFTINGFJACK.

.SPECIFICATION forming part of Letters Patent No. 513,155, dated January 23, 1894.

.Applicationiiled July 27,1893. SerialNo.481.663. No model.)

T0 all whom tm/ty con/cern:

Be it known that I, ARTHUR L. STANFOED, of Evanston, Cook county, Illinois, have invented a new and useful invention, being an Improvement in Lifting-Jacks, of which the following is a suficient speciication, reference being had to the accompanying drawings.

My invention consists in the construction of the various parts, and of the arrangement and combination thereof, as hereinafter fully de. scribed.

The object of my invention is to provide a lifting jack of simple construction'well adapted to lifting railroad cars and for other railroad uses. j

In the drawings Figure 1 is a side elevation of my improved lifting jack, a portion of the standard A being broken away to expose ratchet wheel E and other parts. Fig. 2 is a sectional view on the line @om of Fig. 1, showing also in outline the base of the jack. Fig. 3 is a sectional view of the lifting jack lever which I employ, and also shows in part my novel skeins for controlling the lifting pawl G. Fig. et is a sectional view on the line y y of Fig. 1, showing also 1a longitudinal section of Fig. 3.

A is the frame or standard. This is provided with a broad base, as app'ears'in Fig. 2, to render the machine stable. The standard has a centralslot in which the lifting bar B operates, and is enlarged at its upper portion to receive the operating mechanism. Lifting bar B'within the slotted standard is provided with foot B and cap B 5 and said'bar B has a series of cogs as appears in Fig. l, which mesh with and are controlled by the pinion D. Integral with pinion D are the round bearings D Dthe heXagon portion DV and the journals D D. s

Eis a ratchet wheel, and C is the socket for the actuating lever C C. Pinion D is provided with round extensions on which is mounted lever socket C; and-ratchet wheel E is mounted upon the hexagon portion of the same extension from pinion D. The jour-4 nals D D are preferably formed integral with the pinion D and its extended portion. Ratchet wheel E being rigidly,l mounted is controlled by the lifting pawl G, which is adapted to operate within the lever socket C C; said lever socket having its arms journaled upon the round portion of the extension from the pinion D.

Retaining pawl G is forced to engage with ratchet-wheel E by spring H; and said pawl is disengaged from ratchet-wheel E by the wire W within the two halves of the lever C C. Wire W being attached to pawl H is also attached to rivet .I ,and passes through hand piece T as appears in Fig. 3. Hand piece T is movable nearly the entire length of lever C C, and can anywhere be made available to disengage pawl H through the medium of wire W.

I is the retaining pawl pivoted to the standardJ and adapted to engage the ratchet-wheel E, and provided with an extension as shown. Lever` socket C is located directly beneath the extended portion of pawl I, and by this construction the lever can be utilized to forcibly disengage the pawl I when jack is loaded; the pawl G having rst been disengaged.

It is immaterial whether the openings'in the sides of the enlarged portion of the standard A which receive and support the journal boxes F which contain the journals D', be merely circular openings, or whether these be made in the form of a yoke and open at the top as appears in Fig. 2l; save that if .the latter form be adopted the pinion D may be formed integral with the projecting journals D', whereas if the former construction be used the pinion D and journals D must be formed separate to admit these parts to place in the machine.

The operation of the jack in lifting a load will be readily understood; downward motion of the actuating lever revolves ratchet-wheel E and pinion D through the medium of the pawl G7 and thus the lifting bar B is raised.

The loaded bar B islowered slowly as follows:-

Support the loaded bar with the lever-depressed, then release the retaining pawl and allow the bar to descend somewhat; then allow the pawl I to support the weight, disengage pawl G, and depress the lever, repeating the operation. To precipitate the loaded bar B disengage the pawl G with the hand piece T; then raise the lever C and lever socket C until the lever socket comes in contact with the extended portion of pawl I when same may be forcibly disengaged and the lifting bar B dropped and the load thus precipitated as is frequently' desirable in railroad work..

Having thus described my invention, I claim as new and desine to secure by Letters Patentn 1. A lifting jack comprising a standard, a ratchet-wheel, am actuating lever, andi' a retaining pawl pivoted to the standard Vabove the actuating-lever in position to by gravity engage the ratchet-wheel and also to be disengaged by the lever in the `upward move. ment of, the. latter.

2. I'n a lifting jack the combination of a standard, a lifting bar,a leverV socketw'tliiam actuating lever, a pinion engaging said li'ft- 1 ing, bar, a ratehet-wheed, a lifting and' a re.- 4 taining paw-l adapted tofact uponv said ratcheis-Wheel; saidiever socket being bifurcated to?receive?.tliimvitchetfwlmehhoilowte` contain the liftingpawLand mounted upon the ex- 2o tended portion of said pinion, substantially "as ser forth.

3. A lifting jack comprising a standard, a

yrack-bar, a* pinion, a ratchet-wheel, a hollow lever, a pawl in said lever, a spring operating z 5 g to, thnow the pawl into engagement with the "ratchet-wheel, a wire attached to the outer end of the pawl, and a hand-piece slidable on the wire for operating it. to retract the pawl.

ARTHUR L.' STANFORD.

Witnesses: i

LOUISA G.A Scannen, MARY El STANRQRD.

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