US306413A - Licification - Google Patents

Description

No Model.) E. MOARDLE.

PUNCH. N0. 306,413l PaltentedOot. 14, 188,4.

EEE- ZH U 1 111-1551;; j. ,C MM

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lllsurien Saturne ltr-tireur EDVARD MCARDLE, OF KNOXVILLE, TENNESSEE, ASSIGNOlL BY DIPEC'I AFI) MESNE ASSIGNMENTS, TO M. L. IA'lllllR-SON, 0F Srrlfll BLAUE.

'Pesci-i.

`' .`.QCIFIUATION forming part of Letters Patent No. 306,413, dated October le,

Application i'lcd March 18E-1.

(No model.)

To /tZZ 'whom t may concern,.-

Be it known that I, EDWARD MOARDLE, a citizen of the United States, residing at Knoxville, in the county of Knox and State of Tennessee,- have invented a new an d useful Punch, of which the following is a speciiication, reference being had tothe accompanying drawings.

This invention relates to punches; and it has for its object to eheapen the construction and provide a self-centering automatic punch which will'force out each punching the ruoment the device is raised or withdrawn from the work.

In the ordinary hollow punches generally employed in working on sheet metal by hand, it involves a considerable loss of time to jar or knock out previous punchings, which gradually fill up the hollow interior within the circular cutting-edge. rlhis constant battering on the sides, in connection withthc eXtra scvere blows required to make the punch penetrate when the interior is filled with punchings, injures and destroys the efficiency of the device. 'To avoid this defect and attain the aforesaid objects, the said invention consists in certain details of construction andcombination of parts, as hereinafter set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure l a perspective view of my improved punch.

Fig. 2 is a vertical longitudinal section of the'` same. Fig. and spindle.

Like letters refer to corresponding parts in the several iigures.

Referring tothe drawings, A designates the shank of au ordinary punch, having the usual head, I3, to receive blows from a hammer or like instrument, an enlarged barrel, C, being formed at the lower end ofthe shank, an d provided with the cutting-edge D, which is circular in the present instance, but may be of any forni desired. A longitudinal slot, E, is bored centrally in the shank, to receive a cen- 3 is a detached view ofthe spring `tering-spindle, F, formed on one side with a recess, G, a screw, I-I, passing through one side of the barrel C and engaging at its inner end with the said recess, so as to hold the spindle from dropping out and yet permit its free vertical movement. A spring, I, is in tcrposed between the inner end of the spindle and the back wall of the slot E, and is arranged to be compressed when the punch is struck, the outer end ot' the spindle being ta'- pered to a point, a, which projects ashort distance beyond the cutting-edge of the punch.

The operation of my invention will be readily understood from the foregoing description, taken iu connection with the annexed drawings. The punch is applied to the workin 6o the usual manner, and a blow is given by a hammer or like instrument to cause the cutting-edge D, to punch out a certain amountot the material equal to its forni and size, the punched material fitting rithin the hollow intcrior of the barrel end of the shank. As the blow is given tothe punch, the spindle F is forced inward, and when the operation has been performed the punch is withdrawn or raised from the work, permitting the spring 7o I to exert its force and press the spindle outward, said spindle likewise forcing the punching or punched material, out :from within the hollow interior. It will be seen that the spindle acts automatically to force out each punehing as soon as the punch is raised orwithdrawn from the work, and thus all necessity oit' knocking on the sides of the device to force out the previous punchings contained within the hollow interior will be entirely avoided. So By this means I prevent needless wear on the punch, and, besides, save the considerable loss of time which is employed in extracting the previous puuchings. The screw II, fitting within a recess in the side ofthe spindle, pre- 8 5 vents the latter from dropping out by gravity or under the action ot' the spring, and may be readily withdrawn should the said spring or spindle require renewal or repair'. Since the end of the spindle projects beyond the cut- 9o ting-edge, it will act as a self-centering peint to guide the operation ofthe punch.

I will have it understood that I do not limit myself to the material used in the construction ofthe punch or any of its parts, nor do I limit myself to the precise details of construction, as various modifications in the arrangement and construction of the punch may be resorted to without departing from the spirit or scope of my invention. roo

venience and eiiciencyV in use.

My improved punch is simple and durable in construction, and will prove of great con- Having described my invention, I clairm as new l. rlhe herein-described punch, comprising a shank having its lower end provided with a cutting-edge, a recess formed at the lower end and inclosed by the said cutting-edge, and a vertically-movable spindle arranged within a slot of the shank and having its point projecting into the recess beyond the line of the cuttingedge, so as to center the work, and the means, substantially as described, forholding the spindle in place and allowing vertical movement thereof, as set forth.

2. The herein-described punch, comprising l the shank having a recess at the lower end for the reception ofthe punchings, a cutting-edge inclosing the recess, and a spring-pressed spinvdle working in a slot of the shank, and having its end projecting into the recess a short dis` tance beyond the line of the cutting-edge,Y and the means, substantially as described, for holding the spindle in place and yet allow vertical movement thereof, as set forth.

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

EDVARD MCARDLE.

Witnesses:

LAURA HOFFAR, BENJAMIN ARTHUR .I ENKINs.

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