US1500A - Stump-extractor - Google Patents

Description

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JNO. D. AKIN, OF COLUMBUS TOWNSHIP, WARREN COUNTY, PENNSYLVANIA. i

STUMP-EXTRACTOR.

Specification of Letters Patent No. 1,500, dated february-26,v 1840. l

To all whom 'it m ay concern Be it known that I, JOHN D. ARIN, of Columbus township, in the county of Warren and State of Pennsylvania, have invented a new and Improved Mode of Constructing Stump-Drawing Machines; and I do hereby declare that the following is a full and exact description.V

The nature of my invention consists in firmly sustaining in a substantial, light and convenient frame-which moves like a carriage, upon wheels-a cog-wheel and axle, to which motion is communicated by means of an endless screw and shaft from a wheel worked by hand, in the mode of constructing this frame and in the method of moving it, as hereinafter described, off from or over a stump, sidewise, by a fifth and eccentric wheel and easily again permitting its regular outward motion when it is perfectly clear of the stump.

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation.

I make the wheels of my carriage A, Figure 1, of any convenient size, according to the nature of the ground upon which it is chiefly to be used, as, for example, 3 feet in diameter and 6 inches in tier. My axletrees B and B may be, for example 8 feet, so that the space between the tracks may measure about 6 feet. The hind axle-tree B sustains a bolster O which may be 5 feet 8 in. in length. This bolster and axle-tree are firmly bolstered together and each lof them and also the forward axle-tree may be 7 by 9 inches in thickness. The forward axle-tree, also, sustains a bolster C', the iinder face of which forms a small segment of a large circle touching the upper face of the axle-tree only in its center. Through this point and through the bolster and the axletree a pin passes, which is secured by a nut U, allowing the two forward wheels free motion around the pin as a center, so that the carriage may be turned in the same manner as carriages in common use.' Four upright posts, two and a section of a third of which are represented in the drawing and marked D, are raised upon the four extremes of the two bolsters. They may be 5 feet long and 8 inches square. They sustain two plates, one of which is represented marked E, the upper faces of which are large elliptical segments. These plates run in the lengthwise direction of the carriage.

` inchesY thick.

They may be 8 by 16 in the centerand 8 by` l0y inches at each end. Upon these plates and immediately above their centers. twoA king-posts F, Figs. l and 2, are erected and firmly vdovetailed to the-plates. The king posts may be three feet long-and 6 by 10/ They are strengthened by braces, which are mortised into the plates at a distance of about 24 inches from their ends and also into vthe king posts abouti)AV inches below their upper ends, the tenons.

being made firm into the mortises of the king posts by keys H, Fig. 2, so thatthey may be at any time tightened should ,theV

braces become loose from thel moving or action of the machine. These bracesare intended to aid in sustaining the plates in their position against the resisting power of thelstump and act upon the principle of the arc i.

From the front surface of the king posts and also on the upper face of the plates two segments of a cylinder which is l2 inches in diameter are cut, passing through the point of contact of those faces. These segments have perpendiculars of two inches. In these segments the axle-tree of the cogwheel turns and is prevented from slipping forward or upward or out of them by two upright and horizontal posts X Y, Fig. 2. Of the cogwheel the axle, at its hub, which is 8 inches from the center (of the axle), measures 20 inches, at the working post A" 18 and at its centers of motion l2 inches in diameter. From A" the chain which is attached to the stump is suspended. It is wound around or unwound from the axle as the axle turns. It hangs directly from the center of the machine. The cog-wheel itself, J, may be 6 feet 3 inches in diameter and the cogs ninety in number. It is moved by an endless screw K, which occurs upon a sha-ft L, that is horizontal and parallel to the plates E. 'The shaft is sustained at the forward end by a gudgeon and a stud S, which is supported by the two girts R, that are mortised into the forward uprights. Toward the other end it passes through the orifices P cut in the two studs N represented in section in Fig. 3. These studs are supported in girts R', that are mortised into iio Vto be employed both above andbelowl Two keys vare driven'intothe openings O as'necessity may require, so as to regulate the `po`'V sition of the orifice Pand raise or'lower the -'shaft at will. y The shaft projects 3 feet be-` yond these studs andbehind the carriage and terminates in. a wheelrM, which -may be 6 feet in diameter andris provided with `to'thefmaehine by hand.y p l,

Z is a stay to the frame.

pins perpendicular. to the tier ofthe wheel and two feet inlength where motion is given i and through mortises in the lower,v grts R land R and its tenons'are also mortised and held rmly'intheir position by keys'-V This .stay is represented asV broken in the d`raw`4 is anV eccentric wheel,jrepresentedin section in Fig. 4. 'Its axlej passes through the eenterof the axle B. Its circumference gradually varies from a greater toV a lesser diameter, the smaller of which, when Vit points directly to the center of the earth,

Y wis ofsuch a length as to hang clear of the ground, but, also, 'so that whenV it is drawn a little out ofthe plumb line in a direction opposite to that'of the expansion of its circumference that expansion shall cause the wheel to touch the p ground, thus'raising the two hind wheels o from the ground and the back of the machineupon the increasing surface of itsth wheel, by Vwhich means the'back of the machine may be moved the It passes intoV lengthV of one Irevolution ofthis 5th wheel sidevvise, over o-r off from a stump, when the back of the machine will `again fall `upon its hind Wheels and the-frontfwheels the plates in the position represented and sustained there bytenons, `with which their extremity terminates and which enter mortises inthe forward extremities of the plates. Their second extremity cut so as partially Vto enter 'the ground. V

What I claim as myV invention and desire to secure byLetters-Patent is- The "employment of y he eccentric wheel for bringing the machine above or removingit from a stump `in a sidewise direction constructed and operatngas herein described,`

JOHN D; AKIN.

Witnesses: i

WM. BISHOP, C. HrWILTBERGER.

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