US184850A - Improvement in lifting-jacks - Google Patents

Description

or jack proper. 'cessed at G on the opposite side thereof, to

rrnn STATES OZRO A. EDGERTON, OF MORRISVILLE, VERMONT.

' 'IMPROVEMENT IN LlFTlNC-i-JACKS.

Specification forming part of Letters Patent No. 1 84,850, dated November 28, 1876; application filed October 28, 1876.

To an whom it may concern Be it known that I, OZRO A. EDGERTON, of Morrisville, in the county of Lamoille and State of Vermont, have invented a new and valuable Improvement in Lifting-Jacks; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawings is arepresentation of a longitudinal section of my lifting-jack, and Fig. 2 is a perspective view of myjack proper. Fig. 3 is a detail view of the same.

. This invention relates to lifting-jacks for carriages and wagons; and it consists in combining with a pivoted handle and slidingjack an oscillating; connecting-bar, which operates to diminish friction in raising said jack, and

also to sustain the same firmly in an elevated position.

In the annexed drawing, A designates a bed-piece or bottom-block, on which is secured an upright casing, B, within which casing is a loose su1' porting-slide or jack proper, O. Said slide or jack is provided on top with a succession of steps, 0 c, adapting the same to be used with axles of various heights above the ground, and it receives vertical reciprocatory motion from a lever-handle, D, which is pivoted within said casing B, its long arm being outward. The end of the short inner arm of said lever-handle is connected to the lower part of slide (3 on the opposite side thereof by a bar or connecting-rod, E, which is pivotally attached at both ends. Said rod is straight, except near its upper end, where it curves slightly toward the pivot of said lever-handle, and the said straight part vibrates backward and forward (when said lever-handle is raised or lowered) in a long narrow downwardly-tapering recess, 0, of said slide Said slide or jack is also reallow the upward and downward play of lever-handle D. Said recesses are connected at 0 forming an irregular opening through said slide, which allows the backward and forward motion of the upper end of bar or connecting-rod E, and also allows said slide to move upward and downward without being incommoded by the pivot-pin F of said leverha-ndle. Said pin extends across casing A from side to side thereof. The attachment of bar or connecting-rod E is effected by means of cylindrical studs or lugs e e, which arev made solid therewith, and enter cylindrical recesses f in said slide and lever-handle. The recess f in said slide is shown in Fig. 2. The construction of said bar or connecting-rod is shown in Fig. 3.

When the outer end of lever-handle D is lowered, the inner end necessarily rises, transmittin g upward motion, through bar E, to slide or jack 0. The doubly-pivotal attachment of said rod allows said slide to be forced directly upward, with but a very slight degree of friction. When the upper attachment of said bar or rod E reaches or passes beyond a point above the pivot of lever-handle D, slide or jack 0 is locked, so as to resist any downward force or weight; but when the outer end of said leverhandle is raised, so as to cause said point of attachment to pass forward beyond a vertical line drawn through said pivotal point of said ing recesses O G, and opening 0 with leverhandle D, and connecting-bar E, substantially as set forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

OZRO A. EDGERTON.

Witnesses:

ORLO OADY, A. M. BURKE.

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