US277247A - Lifting-jack - Google Patents

Description

(ModeL) M. BATON.

LIFTING JACK.

No. 277,247. Patented May 8,1883.

WITNESSES UNITED STATES ATENT, .FFICE.

MARCUS EATON, OF (JIROLEVILLE, OHIO.

LlFTlNG-JACK.

SPECIFICATION formingpart of Letters Patent No. 277,247, dated May 8, 1883.

Application filed October 23, 1882. (Modem To all whom it may concern Be it known that I, MARCUS EATON, of Oircleville, in the county of Pickaway and State of Ohio, have invented a new and Improved Lifting-Jack, of which the following is a full, clear, and exact description.

In this improved lifting-jack the lifting and holding pawls are-formed on loose bands or thimbles surrounding the sliding post having the toothed rack, and they engage the rack by being tilted sidewise and disengage it by falling back level. An eccentric lever is employed for working the lifting-pawl, and there is a latch for causing the holding-pawl to engage the rack when required, and allowing it to disengage when it is desired to work the post down, with the load on it, by the lever. The sliding post is provided with a cross-beam attachment, to be employed when it is desired to lift the axle of a light carriage, so as to raise both wheels at the same time, and a removable foot-brace to steady the jack is also provided, all as hereinafter fully described.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a perspective view of a liftingjack constructed according to myinvention. Fig. 2 is a detail of the sliding post and pawls in section; and Fig. 3 is a view of the reverse side of the jack, showing a modified form of latch for controlling thelower pawl of thelifting-post.

The stand a may be constructed in any approved way, with suitable guides in which to enable the lifting-post b to slide up and down, as required in such machines. The said post is provided with the usual toothed rack, 0, to be engaged by the liftingpawl d and the holding-pawl 6, said pawls being formed on rings or hands f, surrounding the post loosely, so as to slide on the post readily. The liftingpawl (Z is arranged above the eccentric lever g, so that it rests at h on the lever, and thereby tilts against the rack-bar to engage it for raising the post by the lever, and when the lever-head swings down the pawl slides down the post along with it. The holding-pawl e rests similarly, at i, on the face 9' of a latch, it, when it is to engage the rack c for holding it;

but when it is desired to allow said pawl to disengage the rack and allow the post to descend, the latch is shifted forward to the right hand,

so that notch l, which is lower than the bars m of the frame, swings under the pawl, allowing it to fall flat on said bars m, in which po sition the pawl swings out of and does not engage the teeth c, thus enabling the post to descend. The lever y will also allow pawl d to drop out of the teeth by swinging the handle 9 up to the vertical line, or thereabout, when the face 71, of said lever is lower than the frame-bar h on which the top ring, 7, rests, and the ring then falls, disengaging the pawl d and allowing the post to drop, provided latch k is set for the disengagement of pawl e, the arm of said latch being swung downward, as

hereinafter described.

To raise the post the latch is set in the po sition shown in Fig. l and allowed to remain. To let the post drop quickly when not loaded, the bands f are lifted by hand opposite to the pawls, which disengage them; but when it is desired to work the loaded post down gradually by the'lever, t e lever is made, in its downward stroke, to co lide withthe arm n of the latch is and swing it over, so that notch Z a 1- lows pawl e to fall on bars at and disengage with the rack, so that by raising the lever the post will descend. When the lever-handle is near the end of the upstroke the point 0 collides with the arm n and swings it back to the position in which it is represented, thrusting face i under pawl e and causing it to engage and hold the post, while pawl d is lifted up the post by hand to take new hold for another loweringoperation, as before. The latch may be thus shifted by hand, if desired, and it is provided with a face, j, opposite j, and is correspondingly reduced at l, opposite notch l, to be employed for the same purpose when it may be desired to shift the latch around on its pivot 11, so that the arm n'will project down ward out of the way of the working-lever. The latch has points w, which serve, with indentations as in bar m, for an indicator to gage the latch, and in practice the points will be arranged to spring or snap into the indentations for stops to keep the latch in place.

When it is desired to use the jack to lift both wheels of one axle off the ground at once,

2 aware I apply a cross-beam, q, to the top of the post, with braces 8 extending from the ends down to the lower end of thepost, where they. are attached to it by a bolt, 2, which enables the beam q to be put on and taken oft at will.

In Fig. 3 I have represented at k a modified form of lever or latch which I propose to employ instead of latch k in some cases, said latch to be placed on the opposite side of the jack, and to be used for disengaging pawl e by lifting up the ring f on that side, and for engaging said pawl by dropping the ring, the bar on of that side being slightly lower than the one on the other side, or the lower edge of the ring being a little higher to allow the same to fall into the notches. This latch k is pivoted to the frame of the jack at m and rests on the stud-pin a. When this latch is used latch is may be swung down so that the part l will rest under pawl e, and said latch will be inoperative.

Near the lower end of the post I), I have attached a bracket, 0, to prevent the post from being accidentally lifted out of the jack, the said bracket coming in contact with thelower edge of a bar, m, if the post is lifted too high.

The bracket also serves a useful purpose by enabling the operator to raise or lower the post by the toe of his-foot when his hands are engaged, and it may be necessary to do so.

9' represents a cross-stay attached to one of the legs a, and forming a base to prevent the jack from falling sidewise. It is to be detachably connected by a bolt at p and a notch or yoke at (1 over a headed bolt, q, fixed to the frame a, in order that it may be quickly dispensed with when not required. stay attachment is especially intended to be used, together with the'top bar, q,for forming a base for thejack while hoisting two wheels at once. These attachments are intended particularly for carriage-makers use, with whom it is customary to have all the wheels lifted off the floor while varnishing the gearing, using trestles and the like, which cannot be removed before the varnish is dry without injury to the varnish by the hands, while with this contrivance the carriage can be let down This cross-.

1. The combination of ring-pawls d c with I the sliding rack-post b, lever g, and substantially as described.

2. The combination of ring-pawls d c with the sliding rack-post b, lever q, rest j, and barrests m-h", the rest j being adjustable to and from under the pawl e, substantially as described.

3. The combination of latch k, having rest j and notch I, with the holding-pawl e and rests m, substantially as described.

4. The latch 7c, having restj and notch l, and arm 'n, in combination with holding-pawl e and the lifting-pawllever 9, said lever having point 0, and being arranged to actuate'said latch, substantially as described.

5. The combination of latch 7c, having rests j and j, and notch l and rest Z, with the pawl e, substantially as described.

6. The combination of latch k, having points to, with the pawl e and bar m, said bar having indentations or, substantially as described.

7. The combination of lever-latch 7a with the ring-pawl e and the lifting-post I), substantially as described.

8. The lever 9, having high face and low face h, in combination with ring-pawl d, liftingpost b, and bar-rests h substantially as described.

9. The combination of bracket 0 with the post I) and bar m of a lifting-jack, substantially as described.

10. The detachable base-stay Q2, combined rest 9',

with the frame of the lifting-jack, substantially as and for the purposes set forth.

11. The combination of beam q and braces s with the sliding post I) of a lifting-jack, the said beam being detach-ably connected to said .post, substantially as described.

MARCUS EATON.

Witnesses SAMUEL W. CARTRIGHT, J. P. WINSTEAD.

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