US50690A - Improvement in stump-extractors - Google Patents

Description

A M. PHOTU-LITHO. CO. N. Y. (OSBORN E'S PROCESS) UNITED STATES PATENTXOFFICE.

THOMAS CRANE, OF FORT ATKINSON,`WISGONS1N.

IM PROVEM ENT IN STU M P-EXTRACTORS.

To all 'whom t may concern.-

Beit known that I, THoMAs CRANE, ot' Fort Atkinson, in the county of J eierson and State of Wisconsin, have invented a new and Improved Stump-Extractor; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specitication, in which- Figure l is a plan view of my improved machine. Fig.2 is a vertical longitudinal section taken centrally through the machine.

Similar letters ot' reference indicate corresponding parts in both iigures.

This invention relates to a novel machine for extracting stumps of trees and large stones from the ground for the purpose of clearing land which it is desired to put under cultivation.

It consists in a machine which is so constructed that the power ot a team, acting through the medium of a large pulley and windlass, is applied to lift one of the legs of a tripod, to the other two ot` which the weight to be raised is attached, thus combining two of the well-known mechanical powers in a most convenient and advantageous manner, las will be hereinafter described.

To enable others skilled in the art to understand my invention, I will describe its construction and operation.

'In the accompanying drawings, A A represent two sill-beams, which are firmly united together so as to form two sides ot' a triangle, and thus give a wide base or support for the parts which are employed to extract the stumps. By thus uniting the sill-bearns they will admit ofa stump between them, as indicated in Fig. 2. To the forward ends ot' these two beams two beams, B B, are securely framed, which are also converging, and which are supported in inclined positions by means ofan inclined piece of timber, C, as shown in Figs. l and 2.

The upper ends ofthe beams B B are adapted for serving as bearings for a horizontal transverse shaft or windlass, D, which carries on one end a large pulley, E, which has an annular groove in its periphery for receiving a rope or chain, a, that is wound upon this pulley and suitably secured to it. The rope or chain a is carried off from the lower side of said pulley and passed through an eye, b, which keeps the rope in proper position during the operation of the machine.

A rope or chain, c, is attached at both ends tothe shaft D and receives the lower notched end of an inclined lifting-bar, F, which extends upward over the shaft D to a suitable height, and is attached to the upper united ends of two beams, G G, as shown iu Figs. l and 2, so as to form a kind ot' joint. The lower ends ot' the two beams G G are supported upon the ends of the sill-beams A A, and are kept in place thereon by means ot'stop-blocks tta, which not only prevent the beams GG from slipping backward, but also prevent them from spreading apart.

The three beams G G and F form a tripod when put together and erected in the position shown in Figs. l and 2, and to the crotch of the two united beams G G a rope or chain, g, is attached, the lower end of which is suitably secured to the stump or stone which it is desired to extract, so that when power is applied to the bar F to lift the upper ends ofthe beams G G both ot' these beams will mutually sustain the load to be lifted.

The operation ot my machine is as follows: The team is hitched to the pulley-rope a, the machine being properly adjusted over a stump,

as shown in Fig. 2, and the tripod erected over it. The lower end of the lifting-beam is seated upon the rope or chain c and the rope or chain g attached to the stump. The team is y now moved ott'so as to turn the pulleyE, which rotates the shaft D and winds the rope or chain C upon it slowly, thus lifting the beam F and raising the upper ends of the beams G G.

lt will be seen from the above description that the strain upon the three lifting-beams G G and F is nearly in a line with their length; that upon the beam F is exactly so; hence these timbers can be made very light and yet possess a sufficient amount ot' strength.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination ot' the tripod lit'ting-t'i'aine G G F, triangular base A, and windlass D, operating substantially as described.

2. Sustaining the lower end ot' the liftingbeam F upon a rope or chain, c, of the windlass D, substantially as described.

3. The combination ot' the pulley E, drat'trope a, windlass D, stirrup-chain O, and the lifting-beam F of the tripod, substantially as described.

THOMAS CRANE. Witnesses:

' EDWARD H. RANKIN,

H. A. PORTER.

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