US117432A - Improvement in trip-hammers - Google Patents

Description

@OHN [KREHBIELO PATENTE 31119251871 TWP FUAMMERO NVENTQRO WsTNESSEISO JOHN KREHBIEL, OF VVILLIAMSVILLE, NEW YORK.

IMPROVEMENT IN TRIP-HAMMERS.

Specification forming part 0f Letters Patent No. 117 ,432, dated July 25, 1871.

To all whom fit may concern:

Be it known that I, JOHN KREHBIEL, lVLD., of Williamsville, in the county of Erie and State of New York, have invented certain new and useful Improvements in Trip-Hammers 5 and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing and to the letters of reference marked thereon making part of this specification, in which- Figure l is a front view. Fig. 2 is a side view. Fig. 3 is a reversed side view of Fig. 2. Fig. 4 is an enlarged view of the elevating-cam.

My improvement relates. chieiiy to that class of trip or power-hammers in which a spring is used to impart a quicker and smarter blow of the hammer on the anvil than can possibly be secured in the old style of trip-hammers, where the entire power ofthe hammer depends on the weight and gravity of the same when released from the cam or other mechanism used to elevate it. My invention consists in securing above the spring a cam or eccentric roller arranged in such relative position to the spring that through its movement the action of the spring is graduated and the stroke ofthe hammer regulated, or its power increased or diminished at pleasure.

This device is peculiarly adapted to the torsion-spring claimed in Benjamin Hersheys patent of February 2l, 1871, and can, consequently, bemost advantageously used in connection therewith.

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

The frame, to which is secured the entire mechanism, is constructed of any suitable material and is of the ordinary style, consisting of a vertical column or shaft, A, terminating in a curved arm, A. This arm A is formed with the usual vertical face-plate a, which serves as a bearing for the guides B B, between which travels the hammer B. This hammer B is formed in one piece, and is such in general outline as is represented in Fig. 1. C is a cam, and is of the form shown in Fig. 4, and by reference to which it will be seen that while it slightly differs from the ordinary S-shaped cam it in its general character closely resembles it. This cam G is secured on a shaft, c, which works in suitable journals or bearings secured on the frame. C is a drivingwheel on the outer end of this shaft c, through which the same is revolved, and which imparts the movement to the cam C that causes it, in connection with the pin b, to elevate the hammer B. D is a spring of the class known as the torsion, or in which the elasticity of' the metal is exerted through the twistin g or wrenching of the rod. This spring is secured on a suitable bearing, D', its lateral lever or turned-in arms d Z resting immediately above the upper face-plate of the hammer B.

Thus far in my description it will be observed that my device differs but little from what is described and claimed in Hersheys patent, before referred to.

On the upper face of the plate a are secured two vertical arms or uprights, E E. To these arms is secured the shaft c that carries the cam or eccentric roller E. F is a pawl-lever attached to the shaft e, and by means of which the roller E is revolved. F is a curved plate attached to the frame c, and through the perforations in the same, acting as ratchet-teeth, the lever F, by means of the pink, can be locked at any desired oint.

p The operation of this eccentric roller E will be readily understood. "When in the position shown in Figs. l and 3 it serves simply as arigid bearing, against which the spring is driven, the spring remaining in its normal condition except when in being elevated the, hammer is brought in contact with it. To increase the power o f the spring through the lever F, the roller E' is revolved so as to bring a different section of its eccentric surface in contact with the spring, and so on iuitil that section is reached which ismost distant from the shaft c, when the spring is in position to offer its greatest resistance, and, of course, when its greatest power will be exerted. However, between this position and that show n in Figs. 1 and 3, and in which the roller Ef is represented as having that section of its surface which is nearest the shaft c immediately above the spring, it is easy to secure different and varying degrees of pressure of the roller on the spring, whereby the operator can graduate the action of the spring at pleasure.

G is a bearing-plate secured to the rear of the frame, and to which is secured the lever G', the same working on the pin or stump g as on a pivotcenter. His a latch-pin, and is attached at right angles to the lever G by a hinged joint. This The spring D, cam or eccentric roller E', plate latchpin H res ts in the aperture a ofthe frame F', and paWl-lever F, When the same are so coma, and can at any time, when the aperture b in bined as to operate substantially as described. the hammer B is coincident With the aperture a', In testimony whereof I have signed my name so enter the aperture b as to secure the hammer to this specification in the presence of tWo suband retain it in an elevated position. H is a scribing Witnesses.

spring, andserves to operate the latch-pin H au- JOHN KREHBIEL, M. D.

tomatically. The pin is Withdrawn at pleasure simply by moving the lever G. Witnesses:

Havingthusfullydescribedmyinvention,What P. F. ZENT,

I claim therein as new, and desire to secure by I). SAWTELL.

Letters Patent of the United States, is-

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