US65569A - photo-litho - Google Patents

Description

uiten tetes strnt- @fitta AZR-O H-EALY, 0F K'ALAMAZ-OO, MICHIGAN. Letters Patent No.` 65,569, dated June 11, 1867.

TO ALL WHOM IT MAY CONQERN:

Be it known that I, AZRO HEALY, of the'village and county of Kalamazoo, in the State of Michigan, have invented a new and useful improvement on Lifting-Jacks;"y and I do hereby declare that the following is a.

full, clear, and exact description of the construction and operation ofthe same, reference being had to the annexed drawing, forming a part of this specification, in which a perspective view of my said invention is given.

The nature and object of my invention is tov furnish such ready facility for adjustments of the lifting-bar y from a fixed operating point as to permitA the use conveniently of a simple and inexpensive yet powerful arrangement of levers for the lifting of heavy bodies, especially when in situations not easily accessible; and the better to enable others skilled in this branch of mechanical art to construct this Amy said invention I will now proceed to describe it.

The frame of my improved jack isusually made of wood, and consists of a plank bed, A, and rail, B,to which two posts, C and D, are framed. The post C is made higher than the other to receive the head of the prime lever, L, and instead of making each post in one solid single piece, and cutting away for the reception of the various parts, to be hereinafter described, I iind it ,more convenient, and usually construct each one of two separate pieces framed a proper distance apart, as seen in the drawing. The lifting end of the lever L (which is curved) is jointed between the high posts by a stout fulcrum-pin, a, and a strong lifting-chain, M, is secured behind the fulcrum, and passes downwards and is connected to the free end of a second lever, Nwhich is jointed at() to the short posts. The length of chain can be varied in linking to the hook j. A section of post is repre* sented as broken away, to exhibit .the foot-pawl 131 engaging with the teeth of a ratchet segment, R,with which the lifting end of the lever N is provided, to sustain the load. 'lhe pawl may be kept in contact with the ratchet by a spring, e, or so constructed as to operate by its own gravity. E represents what usually consti` tutes the .lifting-bar, to be applied directly'under the object to be raised. It is connected by a pin, p, or otherwise, to the lever below, and passes freely through a mortise in the rail B'above. But in order to facilitate its adaptation to objects at varying heights, and for ready readjustments in lifting by successive strokes ofthe lever, I employ, in connection with the bar L, a longer bar, F, (usually of iron,) provided' with a head, G, to be applied underneath the object, and the bar is furnished with ratchet teeth, as may be clearly seen, on' its front face, which teeth engage with a lifting-pawl, P2, hinged somewhere central to the bar E, which is furnished with socket bands, S, within which the ratchet lifting-bar, when not engaged with the pawl, may slide freely up and down. A wire string or chain, e, is connected to the bar above the toothed lportion,`and passes through an opening in the rail 'and oyer a small sheave, 7L, thence between the posts through a lining piece, i, where it is furnished with a ring or other handle within easy reach of thc operator at the lever, to bring the adjustable bar F as close as possible to the object to be lifted, and a wire, f, below7 passing similarly between the posts, com nects with the lifting-pawl P2 to detach it in order to permit the said bar to descend when necessary` Instead of hinging one of the ends of the lever N at one permanent point, O, a series of holes for vertical adjustment may be made, or a ratchet and pawl, in connection with steadying-guides or stops, may bc employed to elevate that end alternately with the other.

I do not deem it necessary to give a detailed description of thiJ various manipulations and adjustments which may be required in lifting heavy bodies by my jack under all possible conditions. For lifting and holding' anything from-the ground temporarily, say a loaded wagonaXle for lubrication, the operator, after properly placing the lifting-bar underneath, brings it up rst as nearly as practicable in contact, by pulling at the cord e, when the pawl P2 will drop into the nearest notch and lock the two bars together. Then depressing the lever L, he lifts, by means of the connectingchain, the second lever N, and with it the combined lifting-bars and wagon. The pawl engaging in the end ratchet, supports the load as long as necessaryi In lowering back, the

operator can throw his whole force on the lever for a short lift to relieve the pawl, their placing one foot on the end of the horizontal arm at n: and pressing down, he keeps the said pawl disengaged until the load is carefully lowered. When the load cannot be raised a suihcient height by onestroke of the levers, blocking is interposed, when the combined bars are lowered as before, and the ratchet-bar brought up by itscord for a succeeding lift.- Should the scope of the ratchet=bar F not prove suiicient, the bar can be lowered by' detaching the pawl; and by blocking up the jack itself, as usual, the lifting is renewed I do not claim by itself the combined arrangement Of the levers and hoisting chain, for that is old; but what I claim as new7 and desire to secure by Letters Patent, is 1 1. The arrangement and combination of' the prime lever L, lifting chain M, and secondary lever N; with the end ratchet R, and -fOot-pawl P1, substantially as and for the uses hel-ein set forth.

2.. I claim the aforesaid arrangement of combined parts used in connection and combination with the liftingbars E and F, lifting-pawl P2, and manipulating cords or wires e and f, the several parte being arranged rela.- tively with the frame of the jack, and with each other, and constructed and opera-ted substantially in the manner and'for the purposes herein described.

AZRO HEALY.

Witnesses:

OTTO L. JOHNSON, GEORGE JOHNSON.

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