US78867A

US78867A - Peterg

Info

Publication number: US78867A
Authority: US
Publication date: 1868-06-16
Anticipated expiration: 1885-06-16

Description

-`JAMES,.-DU'FF, or PEonrA-ILLINo1s.

Letters Patent No. 78,867, dated June 16, 1868.

IMPROVEMENT IN DROP-PRESSES.

@le tlyemle nimm tu in; thse Eaters what: mit mating rari mi the time.

'Be it known that I, JAMVES DUFF, 'of Peoria, in thecounty of Peoria.,`in the State ot' Illinois, have invented a new and useful Improvement on Drop-Presses or Drop-Hammer; and I do hereby declare that the following isa full, clear, and exact description of the construction and operation of the same, reference being had to the' annexed drawings, making part of this specification, in whieh- Figure l is a perspective view.

Figure 2 is an elevation of the two hammers, vshowing a section of the air-chamber.

' Figure '3 is an end view of the t-wo hammers.

Figure 4 is a plan of the upper hammer.

Figure 5 is a plan of Ythe lower hammer. Y

Figure 6 is a perspective viewof the upper hammer', showing the air-chamber; and

.Figure 7 is a perspective view of the Vlower hammer, showing `the plunger.

The'nature of my invention consists in providing a drop-press or drop-hammer with a secondary or followinghammer, and a cushion between the two hammers, or -its equivalent, so arranged as to prevent'tlie'rebound. I

I construct my 4drop-press in any of the known forms, Land' apply thereto theusual appendages and machinery for working the same; but in order; to obviate the rebound of the hammer when it strikes, I connect with the hammer A, a following-hammer, B, bymeans of studpins e e, o'r any convenient arrangement whereby the two hammers, when suspended, will separate to the requred'extennand the fol1owinghainmeuB rest upon the lower hammer A, when both rest upon the anvil.

I make an airehamber, 6, of any form and size, in the face ofonc of the hammers, and provide thc same with an air-passage and stop-cock, d. l A

`represents a plunger, attached to the contiguous face of the other hammer, corresponding in. size and form to the air-chamber b. v

The hammers, being at rest upon the anvil, the plunger aoccupies the airchamber b, but, on being raised,

-they separate, and the airfchamber becomes filled with air. When tire hammers drop, the compressed nir, escaping slowly through the stop-cock d, partially sustains the following-hammer B, and itgradually comes to rest upon the lower hammer A, producing a constant pressure upon the same during thel continuance of the blow, and thereby preventing the rebound. l

What I claim as my invention, and-desire to secure by Letters Patent, is- The following-hammer B, airchamber b, air-passage and stop-cock d, and plunger a, in combination with thehammer A, when arranged in the manner and operating as and for the purpose herein described.

JAMES DUFF.

Witnesses:

E. B. Pinnen, J. S. STEVENS.