US248054A - Stu m p-extracto r - Google Patents

Description

(NoModeL). Y

D. OBRIEN.

-STUMP EXTRAGTOR. y N0.248,o54. Y- Patented ogn-11,1881.`

UNITED STATES PATENT OFFICEO t DAVID vOBRIEN, OF WILLIAMSPORT, PENNSYLVANIA.

sTuM P-'l-:xTRACTo R.

SPECIFICATION forming part of Letters Patent No. 248,054, dated October 11, 1881.

` Application filed August 26, 1881. (No model.)

To all whom t may concern:

Be it known that I, DAVID OBRIEN, a citizen of the United States of America, residing at Williamsport, in the county of'Lyromng and State of Pennsylvania, ha-ve invented certain new and useful Improvements in Stump- Extractors; and l do hereby declare the following to be a full, clear, .and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the. accompanying drawings, and to letters or iigures' of reference marked thereon, which form a part of this specitication.

My invention relates to that class of stumpextractors which consists ofasuspended framework provided with bearin gs for a transverse shaft upon which rotates a ratchet having a sprocket-wheel v attached thereto and at one side thereof, and which frame-Work is also provided with cross-bars,\one for a pawl to operate with said. ratchet and the other for the bear` ing or fulcrum ot' the operating-lever, the wholeapparatus being suspended in a convenient manner-for instance, by means of the common tripod; and my invention consists in the location, combination, and arrangement of dcvices, as hereinalterdeseribed, and specitically set forth in the claims.

1n the construction and arrangement of the devices, as h'ereiubet'ore eXplained,certain objections exist whereby loss of power by undue friction and a lacking of strength are suffered 5l and the object of my invention vis to overcome these objections.

Referring to the drawings, of which Figure 1 is a front, and Fig. 2 a side, detail view, A

represents the frame-work of the machine, and is formed with a loop at its upper end to facili-4 tate its attachment to, for support by, an ordi-1 nary tripod'. This frameis provided with crossbars B and C, and a transverse shaft, D, adapted 'to revolve in bearings in the lower end of the frame. Upon the shaft D is the ratchet J,

having attached rmly thereto on each side.

thereofasprocket-Wheel, K and L, respectively, over'which pass the chains k and l,which are united and terminate in ahook, M. Upon the cross-bar C is a pawl, I, adapted to operatein the usual manner upon the ratchet J and upon cross-bar B. lThe operating-lever G is fulcrumed, it being provided with studs or pins y g, to retain it on the bar and permit ot' its easy removal, and With the eyebolt g2,'for the attachment of the operating-link N.

"'Ihe operation of my machine is as follows: The supporting-tripod being placed so as to support the apparatus over a stump, and the stump-chain being connected with the hook M, the long arm ot' the lever Gis depressed, rais- 6o ing. the link N, and thus rotating theA ratchet and drawing evenly upoi chains k and l, and through them drawing upon the stump-chain. At the end ofthe sweep ofthe lever G the paw] I retains the load while the lever is elevated at its longer arm, thus causing the link to pass over the ratchet and take into another tooth for 'another operation, asjust described.

Now, it will be readily seen that in the construction heretofore nsed the strain upon the 7o apparatus is expended directly upon one side lof the frame and upon one bearing otthc shaft,

resulting in increased friction, and therefore loss of power employed and loss of strength inthe machine itself, and, furthermore, the draft, strain, and operation of the entire maf chine is one-sided. These objections are-entirely ovelcome by the improvement herein shown and described. The power is applied in a direct line to the center of the shat't, the 8o friction of its bearings is evenly distributed and therefore reduced, the strain is evenly borne by each ot' the chains, and the lever has no tendency to swing toward one side or the other, as when the strain is expended upon only one or the other side of the machine.

Having described my invention and its operation, What'Iclaim as new, and desire to sccure by Letters Patent, is

1.*In a stump-extractor, the cnnbiuation of 9o the shat't D, ratchet J, and sprockets K and L` with means, substantially as shown and described, for their operation, as and for the purpose set forth.

2. The combination of the frame-work A, cross-rods B and C, sha t'tD, ratchet J, sprockets K L, chains k l, pawl I, lever G, and link .N, substantially as shown and described.

In testimony- \`vhereof I have aixed my sigl nature iu presencel of two witnesses.

DAVID OBRIEN.

Witnesses f FRANK H. McConMloK, SETH T. McCoRMicK.

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