US18955A - Lifting-jack - Google Patents

Description

JOI-IN CALLAGHAN, OF STROUDS GLADES, VIRGINIA.

LIFTINGr-J ACK.

Specification of Letters Patent No. 18,955, dated December 29s 1857.

To aZZ whom it may concern:

Be it known that I, JOHN CALLAGHAN, of Strouds Glades, in the county of Nicholas and State of Virginia, have invented, made, and used a certain new and useful Apparatus or Lifting-Jack for Lifting Saw-Logs and other Heavy Timber; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, Figure l showing the apparatus complete as applied to the lifting of a saw-log. Fig. 2 is the double fulcrum lever and hitching chain.

The nature of my invention consists in constructing a lifting apparatus, wherein I employ a lever alternating or changing its fulcrum, said lever also ascending in its course of action. That is to say, instead of having a fixed fulcrum and permanent lever thereto, the lever is detached, and merely rests on its fulcra. I employ, therefore, two movable fulcrums in the form of two bolts or pins, inserted in suitable holes, arranged equidistant from each other, but not opposite horizontally, but are so arranged that if lines or dots be drawn from one hole to another across an angle of 30 degrees, said lines or dots will indicate a right angle triangular position as shown in Fig. 1 below the bolts or pins.

The more clearly however to show the nature of my invention, I will describe the construction, and explain the application thereof.

In Fig. l is shown or represented a longitudinal piece of timber of suitable size, and similar in shape to a, a, a, a, a, from six to eight feet long, and having its center mortised out, as at b, b, Z9. Horizontally through the side of this opening, at equal distances, from each other, in two longitudi- 1 nal rows, are series of holes c, c, c, c, c, of

suitable size; say from three-fourths to one inch bore. In said holes are to be employed two bolts or pins of iron with heads or handles as at ZZ, e. These bolts are both attached to a chain f, f, f. A lever g, g, g, Fig. 2, of suitable size, is employed, having formed near its butt end, two notch like formations ZZ, z', and between said notches is a hole in which is fastened a chain, y', j, j, with hook 7c, Fig. 2.

Now in order to apply my apparatus, the detachable bolts or pins d, d, e, e, are inserted in the desired holes near the base or lower end of the ack. The butt-end of the lever g, g, g, is inserted in the slot or mortise Z), b, Z), the chain j, j, passing between the bolts or pins as indicated by the faint links in Fig. l. This will bring the notch z' to rest on the fulcrum (Z, oZ. The chain j, y', j, is then to be passed under the log or timber to be lifted, and to the hook end of the chain is connected a stay-pole Z, Z, one end of which must rest on the upper or top side of the log, while the other end rests on the ground. Now in order to lift a log so as to deposit it on a wagon for transportation, all that is requisite is to press down the end of the lever g, g, g, when the notch L presses down and rests on the fulcrum e, e, the lever is held down in position, and the bolt or fulcrum cZ, d, is drawn out, and inserted in the next hole above, when the notch z', again rests on said bolt d, oZ, and in the act of lifting, or raising up the lever the bolt ZZ, eZ, becomes the fulcrum, and the log also rises. The lever is held in position upward, and the bolt e, c, is withdrawn and inserted in the next hole above, and this bolt e, e, thenA becomes the fulcrum of the lever. In this position the lever will remain, without any other support than merely the pressure or weight of the log. In this manner alternately changing the bolts in the next holes above, and by operating the lever as described, the log must necessarily follow the draft of the chain, as the lever ascends, and the fulcrums are changed upwardly. In adjusting alog upon a wagon for transportation, one man and one boy can readily accomplish with the aid of my lifting apparatus what under ordinary circumstances would require two and three men. While the man operates the lever g, g, g, a boy may draw out and insert the bolts or pins in their respective places; and when the end of the log is at a proper height the wagon to haul it is merely driven or backed under the log, and each end thereof deposited in place.

When the apparatus is arranged in position as shown in Fig. 1, the whole xtures with the log will stand in place with any agency other than the stay pole Z, Z, whose end being held against the upper side of the log, keeps the log pressing against the chain and the jack, the pressure, and gravity of the log in reality mainly causing the vvhole apparatus to maintain itself in position. When smaller logs are being lifted the end of the stay pole need not eX- tend so far over the top of the log m, m, m.

SO very simple is my lifting apparatus that any ordinary Workman or hand about a farm, can construct one, and apply it most readily to almost every purpose of litfing heavy timber or articles. The Whole apparatus is so portable and substantial With all, as Well as cheap Of construction, that it is available to every sawmill, lumberman` and farmer Where called into use. It is deemed useless to enter more at length respecting the advantages of my improved apparatus, and being fully aware thatlifting jacks Of various kinds With lever ap- JOHN OALLAGHAN. v[L 5.]

Witnesses:

ROBERT D. CALLAGHAN, JOHN S. GALLAHER, Jr.

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