US1179816A - Press-guard. - Google Patents

Description

D, D. EVANS.

PRESS GUARD.

APPLiCATIOH FILED APR. 9, 1913.

Patentad Apr. 18, 1916.

iumam W/TNEEE'EE. 67 M444. 1,

DAVID D. EVANS, OF RACINE, WISCONSIN.

PRESS-GUARD.

To all whom it may concern Be it known that 1, DAVID D. Evans, a citizen of the United States, and resident of Racine, in the county of Racine and State of lVisconsin, have invented new and useful Improvements in Press-Guards, of which the following is a description, reference being had to which are a part of this specification.

This invention has for its object to provide a guard member for power operated punch presses which will serve to prevent the operator leaving his hand beneath the punch when the press is started inoperation and thus constitute a safety device to avoid injury to the operators hands which so frequently results with unprotected punch presses of ordinary construction.

The invention consists of a guard arm pivotally mounted on a stationary bracket support on the guide of the punch head and having an actuating connection with the press head comprising a slot in which travels a pin or stud projecting from the punch head so that the downward movement of the punch head gives the guard arm a swinging movement carrying its lower end across the face of the press or the die space heneath the press head and sweeping the hand of the operator therefrom if it has not been previously removed.

With the above and other objects in view the invention consists in the press guard as herein claimed and all equivalents.

members 12 secured to the frame 13 on either side of the press head 10, all of which is usual construction with punch presses. A bracket 14: is secured to the frame and projects forwardly beyond the plane of the front of the press head to form a rigid stationary support for a bracket extension arm 15 which has pivotally mounted at its end a slotted plate 16, the pivotal connection specification of Letters Patent.

the accompanying drawings,

. Patented Apr. 18, 1916..

Application filezi'April 9, 1913. Serial No. 759,964.

17 of said plate being located at one end thereof and the slot 18 extending from near position of the stud on the press head is such that it travels past the pivotal connection 17 ust before reaching the upper end of the stroke of the press head whereby the clownward movement of the press head causes the stud to pass the pivotal connection 17 at the beginning of the movement. The slot 18 is preferably straight for the greater portion of its length and the straight portion therevof is not directed toward the pivotal connection, or the line "of its direction would pass a slight distance from the pivotal con- -nection but the inner end of the slot is curved or angular and directed toward the pivotal connection as clearly seen in Fig. 1, forming a hump or shoulder 22 at the bend thereof which is the principal point of engageinent for the roller 21 in its travel from I one end of the slot to the other. It is said to be the principal point of engagement for the roller for the reason that the roller remains in engagement with this point longer than with any other during its downward travel and while in engagement with this point the roller in its downward movement causes the guard arm 19 to swing from the position shown in full lines in Fig. 1 to the position shown in dotted lines. When the arm 19 reaches the position shown in dotted lines the roller travels through the straight portion of the slot withoutfifurther afi'ecting the position of the guard'arm, but in the return or upward movement of the roller after traveling through the straight portion of the slot without alfecting the position of the swinging arm, it meets with the angular portion of the slot and returns the swinging guard arm to the position shown in full lines.

The movement of the guard arm 19 from the one position to the other as described at the beginning of the downward movement of the press head causes the lower end of said arm to swing quickly across the front of the die space beneath the press head or what may be termed the face of the press and push the hand of the operator from beneath the punch so as to avoid injury if he.

by Letters Patent is:

1. A press guard, comprising a bracket adapted for connection with theframe of apress, a slotted platepivotally mounted on the bracket, a guard arm carried by the slotted plate, and a stud adapted for connection with the press head and traveling in the slot'of thefiplate for causing the guard arm to swing across the front of the die space at the beginning of the downward .movement of the press head.

2. Apress guard, comprising a bracket adapted for connection with a press frame,

an extension arm adju'stably mounted on the bracket, an angularly slottedplate pivotally mounted on the end of the extension arm, a guard arm attached to the plate, a stud adapted for connection with the press head,

and a roller on the stud traveling through the angular slot of the plate for causing a quick swinging movementof the guard arm across the front of the die space at the heginning of the downward movement of the press head.

3. The combin'ationwith a press, of a safety device, the said press having, a frame, a die fixed on the frame and a punch coacting with the said die and mounted to reciprocate in the said frame, and the said safety device havinga vertically disposed leyerfulcrumed on the front of the said frame, the lower portion of the said lever being adapted to move across the front of t-he tlie and punch, and the upper portion having an angular slot and a stud on the cross head of the" punch engaging the said slot. v a

In testimony Whereof,-I affix my signature, in presence of two witnesses.

DAVID D. EVANS Witnesses:

' E. BOARDWIN, W. H. BELL.

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