US1511113A - Safety guard for machine presses - Google Patents

Description

Oct. 7 1924.

H. DOERSAM SAFETY GUARD FOR MACHINE PRESSES Filed Aug. 23. 1923 W 9 m f V M 1 :0 0 m w H a, w A: m a Q z z A TTORNE Y Patented Get. 7, 1924.

PATENT OFFICE.

HUGO IDOERSAM, OF NEW YORK, N. Y.

SAFETY GUARD FOR MACHINE IPBESSES.

Application filed August 23, 1923. Serial No. 658,883.

T 0 all whom it may concern:

Be it known that I, HUGO DOERSAM, a citizen of Germany, and resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Safety Guards for Machine Presses, of which the following is a specification.

The main object of this invention is to provide a device to be attached to a punch press to sweep the area above the die for the purpose of removing the fingers from beneath the same, so that no injury may 001 cur if the operator fail to remove his fingers.

Another object is to provide a safety device as mentioned which is operated simultaneously with the tripping or release of the punch press clutch and performs its function before the ram begins its descent, thereby allowing the device ample time in which to remove the fingers from between the punch and die.

These and other objects will become apparent in the description below, in which characters of reference refer to like-named parts in the drawing.

Referring briefly to the drawing, Figure 1 is a front elevational view of the device.

Figure 2 is an end elevational view of the same.

Figure 3 is a sectional end elevational view of the device taken on line 3-3 of Figure 1.

Figure 4 is a side elevational view of the cam plate.

Figure 5 is a front elevational view of the same.

Figure 6 is a partly sectioned elevational view of the gear carrying yoke.

Figure '7 is a front elevational view of a punch press. showing the safety device applied thereto. 1

Referring in detail to the drawing, the numeral 10 indicates the leg stands of a punch press upon which the table 11 is mounted, the latter supporting the die 12. The crank shaft 13 at the upper end of the press has a fly wheel 14 at one of its ends and is connected to aram 16 by a connecting rod 15, the ram being slidable behind the guides 17 A bracket 18 is preferably attached to the left guide at its lower end, said bracket projecting outwardly and having a bifurcated en 8 in w ch a ho e is formed, the latter receiving a sleeve 20. One end of the sleeve has a U-shaped yoke 21 fixed thereto, the arms 22 of the yoke having holes therein in which a shaft 24 is rotatably mounted. The bifurcated end of the bracket has a screw 25 mounted therein which rigidly secures the sleeve 20 in place in the bracket 18.

A spindle. 26 having a sector gear 27 mounted on the end between the arms 22 of the yoke, is rotatably mounted in the sleeve 20. The sector gear 27 meshes with a small pinion 28, the latter being mounted on the shaft 24 above the lower arm 22. The opposite end of the spindle 26 has a bell crank 29 secured thereon by a screw 30. The vertical arm of the bell crank has a pin 31 projecting from its side, the purpose of which will be more fully hereinafter described, and the opposite arm has one end of a rod 32 connected thereto, the lower end of the latter being attached to the foot trip lever 33/ An angular support 34 rises vertically from the bracket 18 and has a spring 35 secured thereto, the latter being attached to the bell crank 29. A collar 36 having an extension 37, is mounted on the sleeve 20 and has a screw 38 which secures said collar in any desired position. A relatively long sweeper blade 39 having a hole at one end which is slipped over the shaft 24, is mounted on said shaft and is secured in place by a screw 40.

The entire device thus far described is fixed as stated to the left slide guide 17 and is actuated by the rod 32. An additional means for operating the bell crank 29 is provided and comprises a longitudinal bracket 41, the latter being secured to the ram 16. Guide ridges 42 are formed on the face of said bracket. Between these ridges the arm 43 of a cam plate 44 is slid. said arm having a slot 45 therein thru which a screw 46 passes, said screw engaging the bracket 41 and permitting lateral adjustment of the blade 44.

The primary purpose of the entire device is to prevent accidents which would occur when the operator places the Work in the gage of the die and by mistake places it in wrong position and tries to save the blank by thrusting his fingers between the punch and die, from which serious injury usually results. The blade 39 is provided to prevent the perator fr m being able to place shaft clutch is released, thus permitting rotation of the crank shaft 13- and lowering of the. ram 16. Simultaneously, the rod 32 on the opposite side of the press is lowered and rotates the bell crank 29 until the screw 80 comes into contact. with the extension. 3 7

of the collar 3.6. As the bell crank isirigidly secured to the spindle 26, the; latter will. rotatethe. sector gear 27 which rotates the pinion 28, and consequently,the shaft E, there by swinging: the sweeping blade .39: ab ove'the die thrn an arc, carrying everything before it. from the surface of the die. When the stroke of the ram-16} completed, the bell crank will be rotated to its, original position by the tension of spring 35.

, tion' in the usual manner.

It sometimes: occurs that a punch press gets out of order because the brake becomes loose, permitting the crank s-haftto rotate of its own accord;.o-r the clutch may break,

' or the fly wheel be locked on thecrank shaft owing to lack of lubrication. This device will operate just as well under all such conditions. The greatest danger: with punch presses is; that they may often repeat their operations of their own accord. As a punch press repeats, the rod 32: is useless and therefore will not operate the: bell crank 29 owing to said rod, being in its. lowered position. Toi'rotatethe bell crank, the cam plate 44- is provided. As the ram descends-v when repeating, thelower angular edge of the cam plate 44: Wlll engage the pin 31. on.

the bell crank 29 and will rotate the latter,

causing the spindle 26" and shaft 34 to func- Frorn this description it is obvious that if the release rod 32 is broken, the cam plate l l will operate the bell crank to prevent injury to the operator.

Another feature of this device is the mounting of the yoke and sleeve so'th-at. they maybe readily rotated out of position, as is required when a die-setter is removing or interchanging dies. The yoke may be; readily tilted to any. angle desired by; loose'ninq the screw 25. at the bifurcated ends. of. tire bracket 18, after which the sleeve may be. readily rotated out of position.

- v 1. A device of the class described commounted in said yoke, means; at the lower.

end of said. shaft for sweeping the region above a die, and means for" rotating. said shaft.

2. A device of the class described comprising a bracket adapted to be fixed to a punch press and having a bifurcated end, a sleeve mounted in said bracket, Ushaped yoke fixed to one end of said sleeve, a shaft passing thru the arms of said yoke, a sweeper blade at the lower end of said shaft, a gear on said shaft, and means for rotating said gear. 3. A device of the class described comprising a bracket adapted to be fixed to a punch press, a sleeve passing thru said bracket and having a U-shaped yoke at one of its ends, a shaft rotatablymounted; said yoke, asweeper blade at the lower end ofsaidv shaft, a gear: on said shaft, a spindle mounted insaid sleeve, a sector" gear "on one end of said spindle meshing with theaterssaid gear, and means for rotating said spindle,

42. A device of the class described com-- prising a bracket adapted to be fixed to a punch press, a sleeve passing thru said bracket and having a u shaped yoke at one of its: ends,.-a shaft: rotatably mounted in said yoke, a sweeper blade at-the lower end of said sha.-ft,.a gear on said shaft, arspiindle moiurtedin said sleeve, a sector gear on one end Off said spindle meshing with the aforesaid gear, a bell crank: at the opposite-end of said spindle, and means for rotating said" bell crank to rotate said. shaft 5. A device of the class describedcom prising a bracketadapted: torbe fixed to a punch press, a sleeve passing :thru said bracket and having a U-shaped yoke-- at. one;

of its ends, a shaft rotatably mounted in said yoke, a sweeper blade at the lower end.

of said shaft, agear on. said shaft, a spindle mounted in said; sleeve, a sector gear onone end of said spindle meshing with the aforesaid gear, a bell crank at the; opposite end of said spindle, a pin onsaidbell'cranhxa plate secured to tl ieareciprocating rain adjacent said pin, said cam plate vbeing adapted to rotate. said spindle, means for returning said crank to the original position.

6. A device of the class described comprising a bracket adapted to. be fixed to a punch press, a sleevev passing thru said bracket and having a U-shaped yoke at. one of its ends, a shaft rotatably mounted.

said yoke, a sweeper blade at. the. lower end of said.- shaft, a. gear on said shaft, a spindle mounted in said; sleeve, a sector gear on one end of said spindle: meshing with. the aforesaid gear, a bell crank: at the opposite end of said spindle, a pin on said bell crank, a cam plate secured to the reciprocating rain adjacent said pin, said cam plate] being; adapted to rotate said spindle when. engag ingsaid pin, an angular support projecting y from said bracket, a springfsdspended said. support and secured to one-- arm efisaid bell crank, said, being. adapted ta return the bell crank to normal position after the latter has been rotated, and means for limiting the rotation of the bell crank.

7. A device of the class described comprising a bracket adapted to be fixed to a punch press, a sleeve passing thru said bracket and having a U-shaped yoke at one of its ends, a shaft rotatably mounted in said yoke, 21- sweeper blade at the lower end of said shaft, a gear on said shaft, a spindle mounted in said sleeve, a sector gear on one end of said spindle meshing with the aforesaid gear, a bell crank at the opposite end of said spindle, a pin on said bell crank, a cam plate secured to the reciprocating ram adjacent said pin, said cam plate being adapted to rotate said spindle, an angular support projecting from said bracket, a spring suspended from said support and secured to one arm of said bell crank, said spring being adapted to return the bell crank to normal position after the latter has been rotated, a collar on said sleeve, an extension on said collar above the bell crank, said extension being adapted to engage the sides of the bell crank to limit rotation of the latter, and means for rotating said bell crank.

Signed at New York, in the county of New York and State of New York, this 7th 30 day of August, A. D. 19:23.

HUGO DOERSAM.

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