US1102509A - Safety attachment for power-presses. - Google Patents

Description

R. HOELEMANN.

SAFETY ATTACHMENT FOR POWER PRESSES.

APPLICATION TILED NOV. 1, 1913.

Patented Jul 7, 1914.

RICHARD HOELEMANN, F BROOKLYN, NEW YORK.

SAFETY ATTACHMENT FOR POWER-PRESSES.

Specification of Letters Eatent.

Patented July if, 191%.,

Application filed November 1, 191a Serial No. 798.639.

To all whom/2'15 may concern:

Be it known that I, RICHARD a citizen of the United States, and residing at Brooklyn, Greater Ridgewood, in the 5 county of Kings and State of New York, have invented certain new and useful Improvements in Safety Attachments for Power-Presses, of which the following is a specification; such as will enable those skilled in the art to which it appertains to make and use the same. i

This invention relates to ordinary power presses and particularly to safety devices for ap aratus of this class, and the object thereo is to provide an ordinary power press with an improved attachment desi 'ned to prevent injury to the fingers or han s of an operator by reason of carelessness or indifference in the operation of the machine. The invention is fully disclosed in the following specification of which the accompanying drawing forms a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which HOELEMANN,

Figure 1 1s a side View of a part of a power press showing my improvement applied thereto; Fig. 2 a cross section on the line 2-2 of Fig. 1; Fig. 3 a partial section 011 the line 3-3 of Fig. 1, and on an enlarged scale, and; Fig. 4 a partial section on the line 4-4: of Fig. 2, and on an enlarged scale.

In the drawing forming part of this specification, I have shown the main parts of the frame of an ordinary powerpress com-c prising a front table portion a, vertical and parallel side back frame members of, the die bed Z, the vertically movable plunger 0 and the die cl connected with said plunger. I have also indicated at e, the clutch head at the top of the machine, said clutch being detached in the accompanying drawing, and at I have shown the usual vertically movable clutch rod which, in the use of the machine, is operated by a foot lever or pedal, not shown, to throw the machine into operation, the upper end portion of said clutch rod being shown at f and in engagement with the clutch head 0, all these parts being of the usual construction, and forming no part of my invention.

In carrying my invention into effect, I mount in the vertical frame members a a horizontal shaft 9, one end of which is provided with an arm rigidly secured thereto, and secured to t e corresponding frame member a is a bracket arm h having an outwardly curved head if through which. is passed a vertical! arranged ad usting screw 11. adapted to limit the upward movement of the arm 9 andisecured to said arm g is a spiral-spring g which is secured to the corresponding frame member a at g*, and which serves to raise the arm and to turn the shaft g in the backward direction, and is secured to the arm 9 by an eye-bolt or screw 9 v Mounted on the clutch rod f above and forwardly of the shaft g and rearwardl of the bracket arm h is a split block 11 w ich serves to depress the arm 9 in the downward movement of llhQClLltCh rod 7' and to turn the shaft 9 in a forward direction. Mounted on the shaft I 9 between the frame members a? is a split block j having forwardly directed jaws 9' between which is pivoted an arm Is. In the form of construction shown, a bolt is? is passed through the endof the arm is and through the jaws 1' and one of the jaws 3' and the arm is are provided respectively, at one side, with jaws 7' and 7c", and set screws are passed through the jaw 70 and adapted to bear on the jaw 9' and b 'adjusting the screws m, the arm A: may e turned vertically on the bolt 72 into any desired position and secured therein. In power presses of the class to which my invention relates, the die beds 6 are of different vertical thicknesses, and this renders necessary, thevertical adjustment of the guard arm or arms so as to accommodate the attachment to different presses. The split block f is also provided with projecting jaws j through which are passed bolts 7' and by means of this construction, the block j may be. adjusted longitudinally of the shaft 9 and is secured thereto to prevent its rotation thereomby a set screw j" or in any other way.

The forward end of the arm is is provided with a bracket plate 91., to which is adjustably secured a plate 0 provided witha forwardly directed arm 0 having a loop-shaped front end 0 through which the'die' d, is

adapted to operate. Oneof the parts aka),

preferably 0, is provided with longitudinal slots 29 through which are passed bolts p by which the parts a and 0 are connected, and by means of this construction, the part 0 may be adjusted longitudinally of the part n.

The normal position of the parts, when the machine is not in operation, is that shown in Fig. 1, in which the arms 70 and 0 are raised above the die bed 6. In the operation of starting the press, the clutch rod 1 is depressed, in the usual manner, and this throws the arms 70 and 0 into the position shown in dotted lines in Fig. 1, in which the arm 0 rests on the die bed I), and the plunger c operates in the usual manner. The accidents hereinbefore referred to usually occur by reason of the operator carelessly placing his hand or fingers on the die bed 6 at the time the press is thrown into operation, or by the operator failing to remove his hand or fingers from the die-bed at the time the press is thrown into operation. With my improvement however, the descent of the arms is and 0 on the die bed occurs before the downward movement of the plunger 0, and this warns the operator whose hand or fingers will be struck by the arm 0 and stops the machine until they are removed from the die block.

My invention does not in any way aflect the construction andoperation of the press and consists only of the attachment herein shown and described.

My invention is also not limited to any partlcular means for, or method of connecting the arm 70 with the shaft g, nor of conv necting the arm 0 with the arm 70, nor is it necessarily limited to the formation of the arm is and the block j of different parts, nor to the formation of the arms 70 and 0 of different parts, but I prefer to make the arms 70 and 0 of different parts so as to provide for the adjustment of the arm 0 and other changes in and modifications of the various parts of my improved safety attachment for power. presses, as herein shown and described may be made, within the scope of the appended claims, without departing from the spirit of my invention or sacrificing its advantages.

Having fully described my invention, what I claim as new anddesire to secure by Letters Patent is 1. In a power press of the usual construction and involving the usual pedal operated clutch rod, a safety attachment comprising a shaft mounted transversely of and rearwardly of the die bed of the press, a forwardly directed guard arm connected with said shaft, automatic means for turning said shaft so as to raise said guard arm, and means for turning said shaft to depress said guard arm onto the die bed, comprising a stop arm connected with the shaft and a part connected with the clutch rod and operating in connection with said stop arm, and a stop device connected with the frame for limiting the upward movement of said stop arm and the turning of the shaft to raise/the guard arm.

2. In a power press of the usual construction and involving the usual pedal operated clutch rod, a safety attachment comprising a horizontal shaft mounted rearwardly of the die bed of the press, a forwardly directed guard arm connected with said shaft and provided at its front end with a guard, a spring for turning said shaft so as to raise the guard arm, a stop arm connected with said shaft and a stop connected with the frame of the press and in connection with which the stop arm operates to limit the said movement of said shaft, and a part connected with the clutch rod and operating in connection with said stop arm member to turn said shaft so as to depress said guard arm onto the die bed of the press.

In testimony that I claim the foregoing as my invention I have signed my name in presence of the subscribing witnesses this 31st day of October, 1913.

RICHARD HonL'EMANn Witnesses O. MULREANY, S. ANDREWS.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G. P

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