US687620A - Lifting-jack. - Google Patents

Description

. I Patented Nov. 26, IBM, L. R. GOODWIN. V

LIFTING JACK.

(Application filed pr 5, 1901] (NqModoL) Aftomey;

2 v Y V va m) i I l/\ 2 UNITED STATES PATENT Orrrcn.

LANDON R. GOODWIN, OF ARLINGTON, NEW JERSEY, ASSIGNOR TO JOSEPH B. BRAY, OF NEWARK, NEW JERSEY, AND A. M. GOODWIN, OF ARLING- LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 687,620, dated November 26, 1901.

Application filed April 5, 1901.

T0 on whom it may concern:

Be it known that I, LANDON R. Goonyvnv, a citizen of the United States, residing at Arlington, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Lifting-Jacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in lifting-jacks; and it consists in the novel features of construction hereinafter described, reference being had to the accompanying drawings, which illustrate one form in which I have contemplated embodying my invention, and said invention is fully disclosed in the following description and claims.

Referring to the drawings, Figure l is a perspective View of my improved jack. Fig. 2 is a vertical cross-section through the center of the jack. Fig. 3 is a cross-section on line 3 3, Fig. 2.

It is the object of my invention to provide a jack of simple construction which may be readily adjusted for any purpose where heavy lifting or moving is required.

The base or standard A is of ordinary construction, having a central vertical square opening B extending through the entire length. Within this opening, on the inner wall of the standard A and near the upper part thereof,is a shoulder or ridge a, for a purpose hereinafter described. The base or standard A is also provided with two outwardlyprojecting lugs 19 b, which form supports for a pin 5 carrying the supportingpawl C. This pawl C is adapted to operate through a suitable opening in the standard adjacent to the lugs b b for a purpose hereinafter described and has a downwardly-extending tailpiece c, which is normally held in its outward position by the spring 0.

Operating in the opening B is a rack D, having-an upper threaded portion (1*, hereinafter mentioned, integral therewith. At the lower end of this rack'D is a transverse pin d adapted to project beyond the side thereof and placed so that it will engage with the Serial No- 54,487. on model.)

shoulder or ridge a and prevent the rack D from being pulled out of the base A.

E is the head of the jack, which is secured to the upper end of the sleeve c. This sleeve 6 has an opening running through or nearly through the entire length thereof. This sleeve is interiorly screwthreaded and is adapted to engage the screw-threaded portion 01 of the rack D. A ratchet-wheel c, with double-faced teeth, is cast on the sleeve 6 and operates the same, as will hereinafter appear.

Two pawl-carrying plates ff are provided with openings into which the sleeve 6 is adapted to fit. These pawl-carrying plates are arranged above and below the ratchet-Wheel c, as shown in the drawings. The upper plate f has an extensionf and a lip f which extends downwardly over the end of the other plate f for a purpose hereinafter specified. The lower plate f has a downwardly-projecting lug f, to which is pivoted a handle X. It is also provided with a spacing-stud f to which the upper plate f is secured by means of the screw e, the stud serving to maintain the plates f and f the proper distance apart to avoid clamping the ratchet and pawls. It is further provided with an n pwardly-projecting lip f which extends within the downwardly-extending lip f hereinbefore men-- tioned.

The ratchet mechanism is of the ordinary ratchet and double-pawl construction, having the ring G for throwing one of the pawls into and the other out of action at any given time. The pawls H H, which operate on the ratchet-wheel e, are pivoted between the plates ff", and a spring for the said pawls is provided, as shown in the drawings.

A Washer c retains the pawl-operating ring G in position. This washer is held in place by means of a screw e passing through the same, through the lip f and engaging a screw-threaded opening in the lipf of the lower plate, hereinbet'ore referred to. This screw e will hold the two plates steady upon the screw e The head E, which in this construction is made separately from the sleeve, has a cap I.

mounted thereon, which is adapted to revolve on the same. Between this cap and the head a ball-race t is provided for receiving antifriction balls t". The cap I is held in place by means of a screw F.

I pivot the handle or lever X in the manner described for the purpose of enabling the same to be folded against the rack, whereby the jack can be made to occupy but little space. This is very convenient, and at the same time the lever or handle cannot be detached from the jack and is always ready for use.

In operating the'device the head, together with the rack, is raised until the said head engages the object to be operated upon or as near thereto as it can be held by the pawl C. The ring G is then operated to bring the proper pawl in engagement with the ratchet, and the sleeve is then turned through the pawl and ratchet and the head is brought against the body to be lifted and the latter raised to the position desired. \Vhen it is desired to lower the body to its former position, the ring G is turned to bring the other pawl in operative relation with the ratchet.

The sleeve is then turned to lower the head until it is free from the body, when the lifting-jack is removed.

\Vhat I claim, and desire to secure by Letters Patent, is

1. In a lifting-jack, the combination with the base,--of a rack, a spring-operated pawl in connection with saidrack, a long screw integral with said rack, a head provided with a hollow screw-threaded sleeve for engaging said long screw, pawl-and-ratchct mechanism for operating said sleeve and a ball-bearing cap on said head, substantially as described.

2. In a lifting-jack, the combination with the base, of a rack, a spring-operated pawl in connection with said rack, a long screw integral with said rack, a head provided with a hollow screw-threaded sleeve for engaging said long screw, pawl-and-ratchet mechanism for operating said sleeve, a handle operating said ratchet mechanism, adapted to fold down upon the jack, and a ball-bearing cap on said head, substantially as described.

3. In a lifting-jack, the combination with the base, rack and supporting-pawl, of the interiorlyethreaded sleeve provided With the ratchet, the pawl-carrying plates,the pawls carried thereby and the pivoted actuating lever or handle, substantially as described.

4.. In a lifting-jack, the combination with the base, rack and supporting-pawl, of the interiorly-threaded sleeve provided with the exterior ratchet, the pawl-carryin g plates one on each side of said ratchet, the pawls carried thereby, the pawl-controlling ring, the securing means for holding said plates, and pawl-controllingring in proper relation and the folding lever or handle, substantially as described.

5. In a lifting-jack, the combination with the base, rack and supporting-pawl, of the interiorly-threaded sleeve provided with the exterior ratchet, the pawl-carrying plates, one of which extends over the end of the other, the pawls carried by said plates, the pawlcontrolling ring, and means for securing the said plates and ring together, substantially as described.

6. The herein-described lifting-jack, comprising among its members, the base, rack and supporting-pawl, of the interiorly-threaded sleeve, provided with an exterior ratchet, the cap and ball-bearing between said cap and said sleeve, the pawl-carrying plates, one on each side of said ratchet, the pawls carried thereby, controlling means for said pawls and the lever or handle pivoted to said pawlcarrying plates, substantially as described.

In testimony whereof I affix my signature in the presence of two witnesses.

LANDON R. GOODlVIN.

\Vitnesses:

L. P. WHITAKER,

J. ICMooRE.

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