US899131A

US899131A - Clearance device for punch-presses.

Info

Publication number: US899131A
Application number: US42386308A
Authority: US
Inventors: Robert H Pearson
Original assignee: TRAVELERS INSURANCE Co
Current assignee: TRAVELERS INSURANCE Co
Priority date: 1908-03-28
Filing date: 1908-03-28
Publication date: 1908-09-22
Anticipated expiration: 1925-09-22

Description

i i l l 'UNITE STAtTE i ROBERT n. PEARSON, OF' nARiNERiRBOR, -ERs INSURANCE COMPANY, or HARTFORD,

I To all whom it may con-cern:

, NECTICUT.

Naf/399,131.'

Be it known that I, ROBERT H. PEARSON, a citizen of the United States, residing at Mariner Harbor, in the county of Richmond and State of New York, have invented a new and useful Clearance Device for Punch- Presses, of which the following is a specication.

This invention relates to a device which is designed to be a plied to or arranged in coniiection with suc i machines as punch presses,

drop forging presses, power hammers, rivet machines and the like, iii which a punch, drop or hammer is reciproeated by power toward and from dies or an anvil for unching, swaging, forging or shaping nieta for the purpose of ireventing the hand or any portion of the ody or clothing of the operative or any other foreign mattei' from getting caught between the movable and stationary parts when the machine is in operation and becoming injured or thimagcd. The object of the invention is to provide a very simple and cheap device which can be used in connection with or attached to a machine of this character iii such manner that just preceding the time the punch, hammer or drop is to act upon the stock, a clearance arm, finger, bar or like part is moved across or over the dies or anvil in such manner as to force the hand or other part of the body or clothing of the operative from between the punch, hammer or drop and the dies or anvil, which arm, linger, bar or like part can also be arranged so that when it swings back across or over the dies or anvil it can be utilized to remove the piece of stock operated upon, and thus eliminate all danger of any injury to the operative resulting from inattention, carelessness or slowness in placing the stock in or removin the stock from position.

Figure 1 olf the accompanying drawings shows a side elevation of a press provided with a safety device which embodies this invention. Fig. 2 shows a front ele-ration of the same, and Fig. 3 shows a horizontal section on the )lane indicated by the dotted line 3-3 on lLig. 2. l

`The gate 1 of the ress shown is reci rocated in ways 2forme on the front face or the i upri ht frame 3 by the connecting rod 4 and cran 5 on the shaft 6 which is mounted in bearings 7 fastened to the front face of the frame and is provided with a :fly wheel 8.

' The rotation of the fly wheel through crank specification of Lettera Patent. Application mea auch 2s, ieee; seria No. 423,863.

New YORK,'ASS1GNOR To THEiTRAvRLQ CLEARANCE DEVICE Fon PinaeIr--iiaEsens.

- Patented sept, 22, 190s.

and` connecting rod reciprocates the gate which carries a punch, plunger or hairuner 9 `toward and from a die holderlO which"is mounted on the table or anvil 11 on the upper face of the base 1-2. 60

In the form of the invention that is illustrated, a rotatory7 shaft 13 is sup orted vertically at one side of the gate by ieariiigs 14 which are shown as attached to the. front of the upright frame. held against downward movement bv a col' lar 15 located above the up er bearincr and against u ward movement liy4 the colar 16 located be ow the. lower bearing. This vertical rotary shaft has aspiral ioove 17 and 70 movable up 'and down the sha t is a sle/e've 18 that is connected by anariii 19 with the gate. A screw or studv 2() extends through this sleeve into the spiral groove iii the s aft S0 thatthe upward and downward movement of the sleeve will cause the shaft to rotate. Fastened to and projecting from the rotatable shaft is an arm 21. 'This ami is arranged to swing back and forth just above v the dies or anvil when the gate with the 8D punch, plunger or hammer is reci prorated.

The parts are sov timed that. the vertical shaft isrotated and the arm caused to swing across or over the dies or anvil just before the punch, plunger or hammer strikes for performing its work. This movement of the arm, which is positive with relation to the downward movement Of the punch, plunger or hammer will push the fingers or other portion Of the body of the operative or his clothing or in fact any other material from above the dies so that they cannot be hit and inpunch, plunger or jured by the descending -emmen The verticalposition of the arm can be .adjusted according to the nature of 95 the work by changing its4 osition on the shaft and its throw can'be a tered by changing the location of the collars which support the shaft.

The arm which when it swings back it will not tend to catch the. hand or other part of the liodypor other article and push them over the anvil Or dies,

or it can be made to swing completely around 105 by aiteiing the spiral groove 1n the vertical shaft so that it will always pass over the Adies or anvil iii one direction, preferabh;v from back to front, justbefore the punch, lunger or hammer reaches the dies or anvil CONNECTICUT, yIt' CORPORATION OF CON.. i l

This shaft is prefcrablv swings above the dies or anvil can be made to yield forwardly so that or per- 11o forming its work. it is preferred, however,

that the spiral groove be so cut in the rotary shaft that the arm will swing forwardly and i backwardly, and then it can be used to push 'the fingers or other foreign matter from over the dies or anvil when moving forwardly and used to push the stock from the dies or anvil when it passes rearwardly, after the punch, plunger or hammer has performed its work. This can be accomplished by attachingv a piece of flexible material, such as a piece of -verticall(y, above the bed by said bearings and with a spiral 'groove,- an arm at,

provid-e tached to and\movable with the gate, a. stud projecting from said arm into the spiral groove in the shaft, and an arin extending vgate, a stud projectin g y. A Y

lshaft is turned by the movement of the arm ttached to the gate, substantiallyns speci- Led. i

2. The combination with a punch pressv Y 4 having a bed, a frame and a reciprocating gate, of shaft bearings attached to the frame above the'bed of the press, a rotatory shaft supported vertically above the bed by said bearings and rovided with a s iral groove, an arm attac ied to and lnovaii from said arm into the spiral groove in t ie shaft,l an arm eX- tending from the shaft and adapted to be swung over the bed by the rotation of the shaft when the shaft is turned by the movement of the arm attached to the gate, and a wiper attached tothe arm and movable lo with the therewith hack and forth across the bed, sub-` v stantially as specified.

ROBERT n. rEARsoN.-

Witnesses:

T. H. Broos, i SIDNEY 1I. SMxTn.