US385457A - Alfoed caeeoll hall - Google Patents

Description

(No Model.) A. 0. HALL.

STUMP EXTRAGTOR Patented July 3, 1888.

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ALFORD CARROLL HALL, OF CEDAR MILL, OREGON.

STU M P- EXTRACTO R.

SPECIFICATION forming part of Letters Patent No. 3853157, dated July 3, 1888,

Application filed January 19, 1888. Serial No. 261,223. (No model.)

3 is a detail sectional view of the devices for operating the locking-plate.

teferring to the drawings by letter, A designates a tripod,of the usual or any preferred construction, provided at its upper end with an ordinary elevis or suspension-ring, B, as shown.

C designates the suspension-hook of my device, to the lower end of which is swiveled a bifurcated hanger, D, the lower ends of which are secured to the opposite sides ofa block, E, near one edge thereof. This block E is hollow, and the liftingbar F is inserted vertically therethrough. The said lifting-bar is provided along one edge with a series of notches, G, which are engaged by the operating-lever and the lockingplate, as will be presently de scribed, The lower end of the liftingbar is bent toward its notched edge, as clearly shown, so that the weight may be applied in a direct line with the point of application of the power. To this lower end of the lifting-bar I pivotally attach a link, H, to which the'securinghook I is swivelcd. This securing-hook I consists of the main portion or body J, the arm K,piv-

oted thereto,and the clampingring L, pivoted to the body J and adapted to engage over the end of the arm K. This securing-hook I is connected to the stamp to be extracted, or to the stone or other weight to be lifted, by passing the arm K through one of the links of a chain passed around the weight or stump, and then swinging the clamping-ring into position over the arm K, as will be readily understood,

M M designate two links, which have their upper ends secured to the hanger D at the point where the same is secured to the block E, and extend outward and downward therefrom. Between thelower ends of these links a lever, N, is fulcruined, the inner end of which engages the notchesG in theedge of the lifting-bar. The outer end of this lever is connected by the links O to a larger lever, P, to which the power is applied, and which is fulcruincd at its inner end to the lower ends of the braces Q R, which extend upward, respectively, to the hanger D and the block E.

S designates braces which extend from the hanger D to the block E. It will thus. be seen that I have provided a very simple mechanism for operating the lifting-bar and in which great power is obtained, as I employ a corn pound lever combining simple levers of the first and second classes.

Upon the top sides or edges of the block E I. mount a plate, T, which is provided with a central longitudinal slot to enable it to slide transversely to the lifting-bar, and has the de pending lugs or cars U at its opposite ends. In one of these lugs or cars I rigidly secure a stop pin or plate, V, which is adapted to en gage the notches in the edge of the liftingbar, and thereby prevent movement of the same. The opposite lug or car U is perforated, and a pin, W', secured rigidly to the block E, pro jects through the perforation. A coiled spring, X, is arranged around the pin 7, between the block E and the perforated lug or car of thelocking-plate T, and tends to normally hold said plate in position to cause the stop V to engage the notches of the lifting-bar. A cam lever, Y, is pivoted to the outer end. of the pin W and bears against the perforated lug of the locking-plate. To the outer end of the camlever I secure two cords, a b, one of which, a,

hangs freely from the said lever, and the other one of which passes upward through an eye, 0, formed at the end of a rod, Z, projecting upward from the block E, and depends from said eye, It is evident from this arrangement that a downward pull on the cord a will cause the lever Y to swing downward, thereby relieving the pressure exerted by the cam against the locking-plate, and the spring X conse- IEO quently forces said plate into engagement with the notches of the lifting-bar. A downward pull on the cord 1;, however, will force the cam against the locking-plate and release it from engagement with the lifting-bar.

From the foregoing description, taken in connection with the accompanying drawings, it is thought the operation of my device will be readily understood. The object to be operated upon is connected to the securinghook at the lower end ofthe lifting-bar, as described, and the free outer end of the operating-lever is then swung downward, as will be readily understood. The inner end of the operatinglever being in engagement with the lilting-bar, the motion given to said lever will raise said bar. \Vhen the lever has been lowered to the end of a complete stroke, the cam-lever is operated, as hereinbefore described, to allow the looking-plate to engage the lifting-bar, thus preventing the dropping of the bar while the lever is being returned to its former position. This operation is repeated until the weight has been raised to the desired height, or the stump has been extracted.

It is apparent that my device is very simple and efficient, and its advantages, it is thought, will be readily understood without a detailed reference thereto.

Having thus described my invention, whatl claim, and desire to secure by Letters Patent, 1S

1. The combination of the liftingbar, the hollow block through which the lifting-bar works, the suspension-hook secured to the said block, the lever suspended from said hook and engaging thelifting-bar, and the locking-plate supported by the hollow block, substantially as set forth.

2. The combination of the lifting-bar, the hollow block on said bar, the suspension -hook, the bifurcated hanger depending from said hook and secured to the hollow block, the links depending from said block, and the lever fulerumed in the said links and engaging the liftingbar, as set forth.

3. The combination of the lifting bar, the

hollow block, the suspension-hook secured to said block, the links depending from said block, the braces depending from the hook and the hollow block, the lever fulerumed between the links and engaging the lifting-bar, and the lever fulcrumed to said braces and connected to said firstanentioned lever, substantially as specified.

4. The combination of the liftingbar, the hollow block, the suspension-hook secured to said block, the lever suspended from said hook and engaging the lifting-bar, the locking-plate mounted on the hollow block and the camlever for throwing said locking-plate into and out of engagement with the lifting-bar, sub stantially as specified.

5. The combination of the hollow block, the lifting-bar, the suspension-hook secured to said block, the lever suspended from said hook and engaging the liftingbar, the locking-plate mounted on the hollow block, thepin projecting from the hollow block and through the locking )late, the spring coiled around said pin and acting on the locking-plate, and the cam-lever mounted at the outer end of said pin and bearing on the locking-plate in opposition to the spring, substantially as specilied.

6. The combination of the hollow block, the lifting-bar, the suspension'hook secured to said block, the lever suspended from said hook and engaging the lifting-bar, the locking-plate mounted on the hollow block, the canrlever for operating said locking-plate, the rod projecting from the hollow block and having an eye at its end, and the cords secured to said camlever, one depending from said lever and the other passing up to and through the eye in said projecting rod, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two-witnesses.

ALFORD CARROLL HALL.

Witnesses:

ALFRED DAVIES, W. L. PIKE.

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