US64937A - Improvement in lifting-jack - Google Patents

Description

@aiuti tsts @stent @Hita IMPROVEMENT IN LIrTINc-JAGK.

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TO ALL WHOM I'l MAY CONCERN:

Be it known that I, J. H. BEAN, of Marietta, in the county of Washington, and in the State of Ohio, have invented a new and improved Double-Spring Wagon-Jack; and I do hereby declare that the following is a full and exact description-thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon. In the drawings- Figure 1 is a transverse section through the line :v ac.

Figure 2, a side elevation.

Figure 3, an end elevation; and

Figure 4 is a transverse section through the line y y, without the serrated bars.

This invention consists of a lever, 'to which are pivoted 'two serrated bars, in combination with two levers, to each of which is pivoted a detent to it the serrations of said bars,vthe detente'working at right angles to the bars, in a stand, in such manner as to produce a carriagc-ja0k as hereinafter fully described. i

To enable thoseskilled in the art to make and use my invention, I will now proceed to describe its construetion and operation. v

A represents a wooden stand of suitable dimensions, within which are two passages, B B', running vertically from top to bottom. Each of these passages accommodates a serrate bar, C, and each bar is pivoted to the lever F F represent-levers attached side by side to one edge of the stand A, and of the same dimensions. The fulcra of these levers are the studs e elprojecting from the stand. Near the upper ends of the levers are pivoted the detents G G', which playin the transverse passten-gcv H.l The free ends of both detents are bevelled to t in the serrations ofthe bars C C. As the bar C Vis directly behind the bar C', and of the saine width, the detent G is furnished with a projection, a, at its end,.on the right side, to enable it .to engage with the bar C. Springs b b', attached to the edge of the stand, press the lower arms of the levers FIF outward, and thus render engagement with the serrations the normal condition of both detcnts at the same time. Owing to this fact, either of the bars C C can be made a fulcruin for the lever E, and the latterv used as one ofthe first or third class, at pleasure. By using it in each manner' alternately, a very gradual and easy raising of the load results, the lever being left in the b cst position for lifting at the close ci` each prying e`ort, and vz'ee versa.

'Io lower the lever and bars, it is only necessary to press the lower arms of the levers F F inward, when the bars will descend in the passages B B by their own' weight.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is.- 'lhe lever E and serrate lbars C C', both the latter working in the vertical passages B B', for greater security,'in combination with the levers F F, and detents G Gf, and springs-b b', the detents pivoted to the levers, and operating at right angles tothe said bars, substantially as described.

This specification signed.v and witnessed this 22d day of December, A. D.`1866.

, J. H. BEAN.

Witnesses:

J. J. PARKER, A. BLooDeooD.

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