US308361A - Lifting-jack - Google Patents

Description

J S- HOOD,

LIPTING JACK' Patented Nbv. 25, 1884.

. .INVENTOR Unirse JOSEPH S. HOOD, OF STAHLSTOVN, PENNSYLVANIA.

LIFTING-JACK.

SPECIFICATION forming partvof Letters Patent No. 308,361, dated November 25. 1884.

Application Bled October 1, 1884.

To @ZZ whom, t may concern:

Be it known that I, JOSEPH S. HOOD, a citizen of the United States, residing at Stahlstown, in the county of Vestmoreland and State of Pennsylvania, have invented new and useful Improvements in Lifting-Jacks, of

which the following is a specication, refery rable.

Vith these ends in view the invention consists in the combination, with a suitable supporting-frame, of a sliding rack, a suitablyjournaled gear-wheel, and a pivoted lever carrying a pivoted pawl to engage the same.

The invention further consists-in the improved construction and combinations of parts hereinafter fully described, and pointed out in the claim. p

In the drawings, Figure -1 is a perspective view of a lifting-jack constructed in accordance with my invention. Fig. 2 is .a longitudinal vertical section of the same, and Fig. 3 is a vertical transverse section.

In the accompanying drawings, in which like letters of reference indicate corresponding parts in all the iigures, A represents a suitable supporting-frame consisting of the vertical uprights a, connected at their lower ends by a base-block, b, and at their upper ends by two strips, c, each of said vertical uprights being provided on its inner side with a groove or channel, d, running its entire length from end to end.

B represents a bar having an outwardlyextending tongue, e, on each side which ts in the grooves or Channels in the supportingframe. rlhe said bar B is provided on its front face with a series of rack-teeth, f, and is provided on its rear side at the lower end thereof with an outwardly-extending block, O.

At the upper end of the rack-bar B is pivoted a cross-strip, D, which, as will be read- (No model.)

ily seen, may be turned to any desired position or point.

Upon the front cross-strip, c, about midway between the two ends of the same, is secured abracket, g, in which is pivoted apawl, h. This pawl h is adapted to engage any one of the series of teeth f upon the rack-bar B, and thus holdit to any point to which it may be raised. The pawl h is held in engagement with the teeth upon the rack-bar B by means of a coil-spring, i, secured to the cross-strip c at one end and to the under side of the pawl at its other end.

Just below the front cross-strip,c,on each of the vertical uprights a is secured a bracket or box, j. Y,

E represents a shaft which has bearing in the bracketsj. Upon said shaft is mounted a gear-wheel, E', which engages the teeth f upon the bar B. A handle, F, divided at its end, is fitted upon the shaft E, said divided end bearing against the sides of` the gearwheel E'.

Between the sides of the divided end of the handle F,near the rear end thereof, is pivoted a pawl or lever, G, said pawl or lever having a lug, k, which bears against the rear end of the divided end ot' the handle F when the end of the lever or pawl is in engagement with the gear-wheel E', thus serving as ay stop.

The operation is as follows: The jack is placed under the object which it is desired to raise and the handle F raised, the pivoted lever or pawl G sliding over or upon the teeth ot' the gear-wheel E. As soon as the handle is raised to its fullest extent, which is a vertical position, the pawl or lever G drops into engagement with the teeth of the gear-wheel E', and upon the handle F being pushed downwardly the gear-wheel E meshes with the teeth j' upon the bar B and raises the same, the spring-pressed pawl preventing the downward movement of ythe bar B by engaging the teeth of the same.

Then desired, my improved jack may be employed as a track-lifter. In this case the block upon the rear of the bar B is engaged with the under side of the tread of 'the track and the device operated, as before described.

A liftingjack constructed in accordance IOO with my inventionis simple in its eonstrueteeth f, a gearwheel, E, a handle, F, lever G, tion, may be manufactured and supplied at a having lug` k, a pawl, and a spring to hold comparatively slight cost, and by its use a said pawl in engagement with the teeth ofthe heavy or weighty object can be easily raised rack-bar, substantially as set forth. i 5 5 With but a minimum expenditure of power. .In testimony that I claim the foregoing as Having fully described my invention, what my own I have hereto aiXed my signature in I claim as new, and desire to secure by Letters presence of two Witnesses.

Patent, is JOSEPH S. HOOD.

In a lifting-jack, the combination, Withthe /Vitnesses: 1o supporting-frame having grooves d, as shown. XV. O. LooR,

of a sliding` rack-bar having tongues e and S. G. BRECHBILL.

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