US1099025A - Foot-power hammer. - Google Patents

Description

G. E. ORAMER.

FOOT POWER HAMMER.

APPLICATION FILED NOV. 17, 1913.

1,099,025, Patented June 2, 1914,

Gem gc E Gamer;

COLUMBIA PLANDGRAFH 60.. WASHINGTON. D. c.

UNITED STATES PATENT QFFTUEB ONE-T121133) TD FRANK M. CARTER, (31 PICNIC, FLGRIDA, ANT) ONE-THEE?) TO J'Qll'll LAItlElEN, 033

ST. PETIEBSBURG, FLORIDA.

FOOT-POWEP." HAMMER.

incense,

Specification of Letters Patent.

Patented Juno 191st.

Application filed November 17, 1913. Serial No. 801,451.

To all whom it may concern Be it known that l, Gnonon it. CRAMER, a citizen or". the United States, residing); at Tarpon Springs, in the county of llillsboro and State of Florida, have invented certain new and useful Improvements in Foot- Power Hammers; and I 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.

The present invention relates to power hammers, and has for its purpose to provide a construction of hammer which will be capable of delivering heavy and cushioned blows in rapid succession; and wherein the retracting movements of the hammer are cushioned and utilized to impart the initial forces of the next succeeding blows.

A further purpose of the invention is to provide a structure which is especially adapted for use in blacksmiths shops, foundries, and railroad shops; and which is of simple construction, and manner of operation, and inexpensive to install.

In the accompanying drawings forming a part of this application, and in which similar reference symbols indicate corresponding parts in the several views Figure 1 is a perspective view of the power hammer complete; Fig. 2 is a transverse sectional view of a detail taken on the line 2-2 of Fig. 1, and looking in the direction of the arrow; and Fig. 3 is a top plan sectional. view, showing the manner or" connection between the actuating links and the hammer supporting shaft.

Referring to the construction in detail, the machine comprises a base 1 having mounted thereon a supporting frame, consisting of four upright beams 2, connected in pairs or sections by cross bars 3, 4t and 5, and said sections are connected by the cross beams 6 and 7 the whole forming arigid structure.

The shaft 8 is journaled at the upper end of the frame in the cross bars 5, and has its respective ends provided with crank arms 9 and 10 being connected, respectively, with the pair of link rods 11 through which said cranks are actuated. A lever 12 is secured to the shaft 8 to oscillate therewith, and has mounted thereon the helve bar 13 of the hammer. Said bar is provided with an aperture, through which the lever 15! passes, and a pin i l; on said lever holds the holve bar in position.

The hammer has a substantial and resilient connection with the lever 12, through the medium of the leaf spring 15 comprising two strips that are secured to the free end of the lever 19 by a clamping; plate 16 and a nut 17. The free ends of the spring 15 engage with the helve bar 13 on opposite sides of the projection; lever por tion; the spring ends 18 loeiin bent under and disposed against thehelve bar, and the spring ends 19 are connected bv a pin 20 adapted to have movement within the slot provided by the retaining' plate Bv having this resilient connection between the operating); lever and the hammer, the inertia of the lattermay be more readilv overcome. thus making the machine easv of operation: and there is the further advantage that the delivery blow is of longer duration than would be the case if the connection in question were a rigid one,

A pair of treadlc bars 22 are fulcrumed on a shaft 23 secured to the supporting frame, and a treadle 24 connects saidtreadle bars at the free ends thereof, and enough in advance of the anvil to give perfect freedom to the operator.

The link rods 11 connect the treadle at the points 26 with the cranks 9 and 10 of the shaft supporting the hammer, and bv actuating the treadle 2d the hammer will be operated by the operator, as will be clearly understood.

The retraction spring 27 is anchored at one end to the bar 23, and at its opposite end is connected by a link 98, carried by lugs 29 (see Fin. 3), projecting from the shaft 8. k

The retracting movements of the lever are adapted to be cushioned by means of a bar 30, that is movably mounted in a pair of guide members 31 secured to the anvil block 32, and said bar 30 has its respective ends constructed with hoo {S 32, that engage the free ends 33 of a pair of springs 3st, which are anchored to'the base 1 of the supporting structure. -With this arrangement, the treadle bars 22 will, on their retracting" movements be brought forcibly into engagement with the resiliently-inounted bar 30., and as a consequence the upward swing of the hammer will be cushioned and stopped, and the counter-recoil movement of the springs 34 acting through the bars 30 and 22 will forcibly return the hammer, or impart thereto its initial stroke.

It is obvious that various changes might be made in the herein-described construction without departing from the spirit of my invention.

1 claim 1. In a power hammer, the combination of a supporting structure; a crank shaft journaled on said structure; a lever fiXedly mounted on said crank shaft; a hammer helve fitted on said lever; a spring secured to said lever and having resilient engagement with said hammer helve; a treadle-bar ful crumed on the supporting structure; a treadle on said treadle-bar; a link connection between said treadle and the crank shaft for actuating the hammer; and a retraction means for the hammer, substantially as described.

2. In a power hammer, the combination of a supporting structure; a crank shaft journaled on said structure; a lever fixedly mounted on said crank shaft; a hammer helve fitted on said lever; a leaf spring secured to said lever and having its respective ends in resilient engagement with said hammer helve; an anvil supporting block; a

pair of treadle-bars disposed to either side of said anvil supporting block and fulcrumed on said supporting structure; a treadle mounted on said treadle-bars; a pair of links connecting said treadle with said crank shaft for actuating the hammer; and a retraction spring anchored to said supporting structure and connected to said crank shaft; substantially as described.

3. In a power hammer, the combination of an upright supporting frame; a shaft journaled on said frame and having cranked ends; a lever fixedly mounted on said shaft; a hammer helve fitted on said lever; a leaf spring secured to said lever and having its respective ends in frictional and resilient engagement with said hammer helve; a pair of treadle-bars disposed to either side of and fulcrumed on said frame; a treadle connect- F ing said treadle-bars; a pair of links connecting said treadle with the crank ends of said shaft for actuating the hammer; and a retraction spring for the hammer, substantially as described.

In testimony whereof, I affiX my signature, in presence of two witnesses.

GEORGE E. GRAMER.

lVitnesses VVILLIAM F. HINES, VALTER P. Bnvis.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. C.

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