US831912A - Power-hammer. - Google Patents

Description

PATENTED SEPT. 25, 1906.

G. H. 'WADSWOR-TH.

POWER HAMMER.

, APPLIGATION FILED APR. 28, 1905.

2 SHEETSSHEET 1.

.I I l l I N v H fVZ'nJJ6J l'n 061F602? QWA/VVJM No. 831,912. I PATENTED SEPT. 25, 1906. G. H. WADSWOR-TH.

2 SHEETS-SHEET Z AL -EZ-;-I 3D 1) 8 a 71431572 ed'o'eJ- Inventor.

UNITED STATES PATENT OFFICE.

GEORGE H. WADSVVORTH, OF OUYAHOGA FALLS, OHIO, ASSIGNOR TO THE FALLS RIVET AND MAQHINE COMPANY.

POWER-HAMMER.

Specification of Letters Patent.

Patented Sept. 25, 1906.

Application filed April 28, 1905. Serial No. 25 7,832.

To all whom, it may concern.-

Be it known that I, GEORGE H. WADS- WORTH, a citizen of the United States, residing at Cuyahoga Falls, in the county of Summit and State of Ohio, have invented a certain new and useful Improvement in Power- Hammers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

My invention relates to power-hammers, more particularly such power-hammers as are used in welding and shaping links, and has for its object the arrangement of the opcrating elements in such manner that the various parts shall efficiently operate without being subject to useless and unnecessary wear.

In power-hammers of this type it is customary to retract or lift the hammer above the anvil-block by means of a positively and continuously driven cam. When the influence of the cam is removed, the hammer-head tends by gravity to fall and is assisted and materially reinforced in this action by means of a stout spring suitably attached to the hammer-helve.

In order to control the falling of the ham mer-head independently of the synchronism of the cam, there have been used catches applied to the moving parts designed to engage with fixed latches when the hammer-head has been lifted to its highest position by the cam, and thus retain the said head until the operator releases the catch and latch from their engagement by some suitable means, such as a treadle. This arrangement has been found to be open to the objection that the part upon which the cam bears cannot be depressed beyond the path of movement of the cam itself, and consequently although retained in this depressed position by means of the catch and lat'ch mechanism referred to still remains in such position as to be stroked or wiped by the cam upon each revolution thereof. This continual rubbing by the cam results in so wearing away the surfaces of the engaging parts that the ultimate effect is the cam will not be able to depress the cooperating parts sufficiently for the catch and latch to come into engagement. It is to remedy this defect that I have produced the mechanism described and claimed below.

Referring to the accompanying drawings, Figure 1 is a side elevation of mechanism for operating a power-hammer with my improvement applied thereto. Fig. 2 is a detail vertical section of the locking mechanism. Fig. 3 is a plan of the locking mechanism, partly sectional. Fig. 4 is a transverse section showing a feature of my invention in the drawings.

A represents the base-block, on which the anvil-block A is supported. Pivoted to the anvil-block A is a hammer-helve A adapted to be operated in its downward stroke by the spring B. Likewise connected to the hammer-helve and operated by a cam C is a lever D.

As will be seen from the arrangement of parts the rotation of the cam C depresses the end of the lever D, and thus lifts the hammerhead in opposition to the tension of the spring B When the lever D is depressed by the extreme movement of the cam C, it is engaged in a manner hereinafter described by the latch E in such wise as to retain it in this depressed position until released by the operator.

For the purpose of retaining the lever D in this position and at the same time avoiding wear by the constantly-rotating cam I have cut away the outer extremity of said lever in such manner as to provide a recess D the floor of which shall be inclined inwardly and downwardly when the arm is at its lowest point of movement. Slidingly mounted in this recess and straddling the arm D is a block D, provided with a slot D through which passes a headed guiding and retaining pin D The upper portion of the slot D is provided with a shoulder D which passes under the head of the pin D A spring D thrusting at one end against the lever D, tends to push the block D toward the outer extremity of its movement, and, as will be obvious from an inspection of the drawings and the description above, this outward thrust will also result in lifting said block, owing to the fact that it rides on the inclined floor of the recess D As will be seen by reference to Fig. 4, the block is pro vided at its sides with depending flanges D which, together with the pin D insure that it will retain its proper position upon the lever.

Fixed below the end of the lever is the latch E, mounted in a holding-frame E and pressed forward by a heavy spring E. Suitably connected to the latch is a bell-crank E adapted to be operated by a treadle-lever E in such manner as to retract the catch against the action of the spring E. The various parts are so positioned with regard to each other that when the tail of the cam C has, through its bearing upon the block I), depressed the lever D as far as possible the toe D, formed at the extreme end of the lever D by the inclined floor of the recess D is in position to be engaged by the latch E. When in thisposition, the catch E will be pressed forward by the spring E against the face of the block D, and this pressure will be met by that of the s ring D", bearing against the rear of said bloc r. I so proportion the strength of these springs that the pressure behind the catch E is suflicient to overcome that behind the block D and will thrust the latter back, enabling the catch E to overlap and engage said toe D. Now it will be observed by this action that the block I) is not only thrust backward, but is also depressed and forced downward somewhat by reason of the fact that the floor on which it rides and the shoulder D are inclined to effect this result. A very slight depression will be suilicient to remove the upper surface of the block out of the path of the tail of the cam. Thus the lever D may be depressed by the cam and at the same time automatically withdrawn from the path of the depressing element and maintained in that position for any desired length of time Without being subjected to the slightest rubbing or wearing by the cam, although the latter may be continuously rotating.

It is obvious that many changes in design and detail may be made without departing from the spirit of my invention or altering the character thereof.

Having described my invention, I claim 1. In power-hammer mechanism, the com bination of a hammer, lever mechanism f or moving the same in one direction, constantlyacting means tending to move the hammer and lever mechanism in the opposite direc tion, operating means adapted. to engage a wearing-surface on said lever mechanism and means adapted to automatically remove said wearing-surface from the path of said operatmg means.

2. In power-hammer mechanism, the combination with the hammer, of lever mechanism operatively connected. with the hammer and having a movable wearing member, a cam adapted to engage said. member to move the hammer, and a latch adapted to hold the lever mechanism with said wearing member clear from contact with the cam.

3. In power-hammer mechanism, the combination with the hammer, of a lever operatively connected to the hammer, a movable wearing member having an inclined connection with. the lever, a cam adapted to bear on said member, and a latch adapted to move said member on the lever into an idle position to clear the cam.

4. In power-hammer mechanism, a lever connected to the hammer-head bearing a movable portion adapted to be engaged by a bearing-surface, a latch adapted to engage the lever when the latter is shifted by said bearing-surface and to move the said mov able portion of the lever into such position as to be out of engagement with said bearingsurface.

5. In power-hammer mechanism, a lever connected with the hammer-head, a movable block carried by the end. of the lever, a cam adapted to move the lever by engagement with the movable block, a latch adapted to engage the lever and simultaneously move said block, and guiding means adapted when the block is so moved to retract it from the position of the cam.

6. In power-hammer mechanism, a lever connected with the hammer-head carrying at its end a sliding block riding upon an inclined floor, a spring seated against a portion of the lever and tending to thrust said block to an extreme forward and outer position, a cam adapted to bear on and depress said. block when the latter is in such position, and a catch located so as to engage the toe of the lever when the latter is depressed, and simultaneously thrust the block backward whereby it is removed from contact with the cam.

7. In power-hamm er mechanism, the cornbination of a hammer, means tending to move the hammer in one direction, mechanism for moving the hammer in the other direction including an independently-movable member, a cam adapted. to engage such member, and means adapted to automatically maintain said member out of the path of the cam, whereby the cam may rotate without wearing said mechanism.

In testimony whereof I hereunto ailix my signature in the presence of two witnesses.

enonen H. WADSWORTH.

WVitnesses E. B. GILoHRIs'r, E, L. THURs'roN.

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