US475934A

US475934A - Lifting-jack

Info

Publication number: US475934A
Authority: US
Publication date: 1892-05-31
Anticipated expiration: 1909-05-31

Description

W. H. COX.

LIPTING JACK.

(No Model.)

No. 475,934. Patented May 3.1, 1892.

UNITED ySTATES PATENT Fries.

VILLIAM H. COX, OF VIRDEN, ILLINOIS.

LlFTlNG-JACK.

SPECIFICATION forming part of Lettere Patent Ne. 475,984, dated Mey 31, 1892 Application filed April 9, 1892. Serial No. l28,535. (No model.)

To all whom t may concern.:

Be it known that I, WILLIAM H. COX, a citizen of the United States, residing at Virden, in the county of Macoupin and State of Illinois, have invented certain new and useful Improvements in Lifting-Jacks; and I do declare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference boing had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specitlcation.

My invention relates to improvements upon my prior patent, No. 468,905, granted February 16, 1892, my object being to produce a device by means of which the lifting-bracket will climb the standard by the movement of the handle and which will be more simple, convenient, and effective than those which do the same thing.

With this object in view my invention consists in the peculiar features and combinations of parts, more fully described hereinafter, and pointed out in the claims.

In the accompanying drawings, Figure l represents a side elevation of my invention, showing the position of parts arranged so that the bracket will climb the standard upon moving the handle. Fig. 2 represents a view of the opposite side of the jack, showing the position of parts when the sliding bracket is adjusted Without the aid of a second clamp.

The reference-letter a represents a standard, pivoted to a base Z) and provided at its upper end with a handle c, by means of which the jack can be easily and conveniently moved about. Arranged to slide upon the standard a is a sliding bracket d, provided with a substantially forwardly-extendin g arm e, having a concaved upper surface to retain a wagon-axle, such as f. Pivotally secured to the under inner face of this arm is the short arm of a bell-orank-actuating lever g, having a movable fulcrum-rod h, the lower end of which rod is pivoted to a clamping-runner t, adapted to clamp the standard by means of the plate-spring 7s, which is secured to the forward upper face of the runner and bears against the front face of the standard. Secured to the rear lower edge of the sliding bracket is a releasing-rod Z, the lower end of which is adapted to engage the rear upper face of the clamping-runner when the actuating-lever is raised to a vertical position. All the foregoing is described and shown 1n my prior patent before mentioned.

Surrounding the standard a and placed between the upper an d lower sides of the bracket d is a second clamping-runner m, which isA held out of engagement with the standard a by means of a thumb-lever n, pivoted on a movable support o, which fits in the recessed side of the standard and travels with the bracket in its movements by means of a lug, the upper end of which bears against the lower edge of the upper side of the bracket and the lower end bearing upon the upper face of the clamping-runner m. The runner is held in engagement with the standard when the thumb-lever is thrown back or Into a horizontal position by means of a platespring p, which bears against the lower edge thereof. The rear end q of the runner 1s fulcrumed or supported in the rear edge of the bracket and held in this position by a removable plate r.

Having thus described the preferred form of construction, I will now proceed to describe its operation.

When it is desired to use my jack, the op crater grasps the'handle c with his left hand and the handle of the actuating-lever g with his right hand and raises thelatter handle to a vertical position. This movement allows the releasing-rod Z to bear upon the rear end of the runner t', thereby releasing it, and the runner and bracket are thus allowed to slide on the standard a, either up or down, at the will of the operator. The jack is now ready to be adjusted to an axle of any height, so the operator places the arm e directly under the the axle and pulls upon the handle ofthe actuating-lever g, and as the bracket cl is con neeted thereto it will of course be raised also. The operator raises the bracket until its upper face bears against the lower face of the axle, such as is shown in Fig. l. Ile then releases the handle of the actuating-lever g from its vertical position, which movement allows the releasing-rodZ to become disengaged from the runner i, allowing the runner to clamp or bind against the edges of IOO the standard. This position is shown in Fig. 1. The axle of the wagon is now ready to be lifted and the handle of the actuating-lever g is pushed downto the position shown in Fig. 2, which raises the aXlea predetermined distance, the runnerfi forming a rigid base for the fulcrum-rod h. Now if it is desired to raise the axle still higher the second clamping-runner m is brought into play by throwing the thumb-lever n down to' a horizontal posit-ion, as shown in Fig. 2, thus allowing the spring p to eXert its energy and force the forward end of the runner n p, thoreby binding against the faces of the standard. It will be seen that by using this second clamping-runner m the handle of the actuating-lever g can be raised to thc position shown in Fig. l without fear of the weight of the Wagon forcing the bracket d down, and a higher `grip can thus be secured upon the standard by the ruimer t.

Having thus described iny invention, what I claim as new, and desire t0 secu re by Letters Patent, is-

I. The combination, in a lifting-jack, of a standard, a bracket movable on said standard, a movable clamping-runner, a lever having its fulcrum on said runner and adapted to actuate the bracket, and asecond movable clamping-runner, substantially as described.

2. In a lifting-jack, the combination of a movable clamping-runner, a movable bracket supported by said runner, and a second clamping-runner placed above the first and adapted to support the bracket,substantially as described.

3. In a lifting-jack, the combination of a bracket surroundinga standard and movable thereon, a movable clamping-runner adapted to support the bracket, a second clampingrunner, a spring for throwing` said second clamping-runner in position, and a movable thumb-lever for throwing it out of position, substantially as described.

In testimony whereof I afx my sign atu re in 45 presence of two witnesses.

WILLIAM I-I. COX. Witnesses:

BALFoUR CoWEN, F. N. MARTIN.