US2293287A - Material handling device - Google Patents

Description

Aug. 18, 1942. I A, E. FRANZ 2,293,287

2 MATERIAL HANDLING DEVICE Filed Aug. 1, 1940 3 Sheets-Shee l Q INVENTOR. L fix BHPT/f. Ffifl/vz.

ATTORNEYJ'.

Aug. 18, 1942. NZ 2,293,287

- MATERIAL HANDLING DEVICE Filed Aug. 1, 1940 3 Sheets-Shes; 2

Aug. 18, 1942. A, E, FRANZ 2,293,287

MATERIAL HANDLING DEVICE Filed Aug. 1, 1940 3 Sheets-Sheet 3 ATTORNEYJ' Patented Aug. 18, 1942 Albert E. Franz,

Detroit, Mich., assignor to General Motors Corporation, poration of Delaware Detroit, Mich, a cor-' Application August 1, 1940, Serial No. 349,261

3 Claims.

This invention relates to a material handling device and more particularly to a device for automatically removing a metal stamping from a press after the stamping operation.

It is the object of this invention to promote the safety of the operator of the metal stamping press. This object is achieved by means of a thereby obviating the need for the operator to incur the danger incident to the manual removing of a stamping from the press.

The invention contemplates a device of a simple nature which will efficiently remove the stamping from the press and simultaneously turn the same to facilitate further handling of the stamping.

In the drawings:

Fig. 1 is an elevation of the press showing the reciprocating die member raised.

Fig. 2 is a section along the line 2-2 of Fig. 1.

Fig. 3 is a section along the line 3-3 of Fig. 1.

Fig. 4 is a fragmentary elevational view similar to Fig. 1 with a full line showing of the press .closed and with a dotted line showingof the reciprocating die on the way up.

Fig. 5 is a vertical sectional view through the .press showing the modified form of the invention.

Referring more particularly to the drawings there is shown a press having a stationary die I and a reciprocating die 2. The die 2 is arranged for reciprocation upwardly and downwardly in a well known and conventional manner.

The lower die I is a composite die, the inner portion 3 of which is mounted upon and cushioned by coil springs 4. A pair of arms 5 and 6 are pivotally supported by pins 1 and 8 upon support members I 3 fixed upon the lower die I. The lower die is provided with recesses 9 into which the arms 5 and 6 swing or retreat when lowered. When the pivoted arms 5 and 6 are lowered they lie fiush with the upper surface In of the die I.

The arms 5 and 6 are arranged to be raised automatically after the stamping operation .as the reciprocating die 2 moves upwardly. Operand 6 can be effected by any @ation of arms 5 movable member of the press. By way of .description the stationary die is provided with a pair of levers II and I2 pivotally supported upon the die I as at I4. The levers II and I2 project beyond the sides of the die as at I5. A pair of fingers I6 and I! are pivotally mounted as at I8 and I9 upon th reciprocating die 2. The fingers I6 and I! are normally retained against their respective stops 20 by the compression springs 2| which act against the heads of bolts 22. Bolts 22 are fixed to arms I6 and I1 and project through suitable openings 23 in the stops The levers I6 and I I are provided with hooked ends 24. The press is provided with a chute 25 into. which the stamping 26 is discharged.

In operation of the press the sheet metal member 26 which is to be stamped is positioned upon the lower die I, 3, over the arms 5 and 6. As the upper die 2 moves downwardly to stamp the metal 26 in cooperation with the lower die, fingers I6 and I! pass by levers II and I2. After the drawing operation is completed and the reciprocating die 2 starts upwardly, the hooked ends 24 of fingers I6 and I! engage levers I I and I2, thereby swinging the same upwardly. As levers II and I2 swing upwardly they simultaneously swing arms 5 and 6 upwardly from the lower die 3, as shown in Fig. 2, thereby ejecting the finished stamping 26 into the chute 25. Upon further upward travel of the die 2, fingers I6 and I "I disengage or release levers II and I2 which with arms 5 and 6 return by gravity to lowered position.

Preferably the stamping 26 is turned in its own plane through approximately as it is dis- ;charged from the press. To effect the turning of stamping 26, arm 5 is properly timed so that it is raised before arm 6. This is accomplished by making finger I'I longer than finger I6 so that finger I'I picks up lever I2 after finger I6 picks up lever II and raises arm 5. Since arm 5 is arranged to raise before arm 6, the left hand end 21 of stamping 26 will be ejected from the press before the right hand end 28, Fig. 3, thereby turning the stamping 26 as above described.

travel as it is ejected from the press. After being turned through 90, the longitudinal axis of the stamping 26 is parallel to its direction of travel. Figs. 2 and 3 show the stamping 26 partially turned. In Fig. 3 the stamping has been ejected from the press but is still in the process of being turned because the turning force exerted by the action of arms 5 and 6 has not been fully expended.

In the modified form shown in Fig. 5, the stationary die is provided with a pair of spaced arms 30 pivotally mounted as at 3| upon the lower die in the same manner as arms 5 and 6. The arms 30 are arranged to be raised and lowered by compressed air. To this end each of the arms 30 is provided with a conventional and well known compressed air motor in the form of a cylinder 32 pivotally supported as at 33 on the lower die I. The cylinder 32 is provided with a piston 34 and a connecting rod 35 pivotally connected as at 36 to one end of the arm 30. Cylinder 32 is provided with compressed air inlet and exhaust lines 31. When compressed air is admitted into the cylinder 32 to the right of piston 34, arms 30 are raised to eject the stamping 26 from the press in a manner identical with that of the principal form of the invention described above. The admission of compressed air into the cylinders to raise the arms 30 will be timed differently. Thus to raise one arm 30 before the other tosimultaneously eject the stamping from the press and turn the same, the admission and exhaust of compressed air irom the air cylinders 32 may be controlled by manually operated valves, but preferably is controlled by a pair of air valves automatically operated by the reciprocating die 2'.

The term die is used broadly herein to include not only the die member which does the forming of the metal, but also the base or support upon which the die is mounted.

I claim:

1. In combination with a press for stamping a sheet metal blank comprising a reciprocating die and a stationary die provided with a pair of recesses, a pair of arms pivotally supported on the stationary die and arranged to retreat into said recesses and lie beneath the sheet metal blank during the stamping operation, a pair of fingers pivotally mounted on the reciprocating die arranged to raise the arms in timed relation one before the other and thereby simultaneously eject the sheet metal blank from the press and turn the same side for end as the reciprocating die moves away from the stationary die.

2. In combination with a press for stamping a sheet metal blank comprising a reciprocating die and a stationary die provided with a pair of recesses, a pair of arms pivotally supported on the stationary die and arranged to retreat into said recesses and lie beneath the sheet metal blank during the stamping operation, a pair of fingers pivotally mounted on the reciprocating die, a pair of levers pivotally mounted on the stationary die, one lever beneath each of the said arms, the said levers arranged to engage the pivoted fingers in timed, relation one before the other as the reciprocating die moves away from the stationary die whereby the arms are raised one before the other to simultaneously eject the sheet metal blank from the press and turn the same side for end.

3. In combination with a press for stamping a sheet metal blank comprising two dies having relative reciprocation toward and away from each other, spaced members mounted in relation to one of said dies so that the members are beneath the sheet metal blank during the stamping operation, and means operated in timed relation with the relative reciprocation of said dies to raise the said spaced members in timed relation one before the other whereby the sheet metal blank is ejected from the press and simultaneously turned edgewise when the dies open.

ALBERT E. FRANZ.

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