US2868582A

US2868582A - loisell

Info

Publication number: US2868582A
Authority: US
Publication date: 1959-01-13
Anticipated expiration: 1976-01-13

Description

1959 P. J. LOISELL MATERIAL HANDLING DEVICE Filed Dec. 51. 1954 2 sheets-sheet 1 P. J. LOISELL MATERIAL HANDLING DEVICE! Jan, 13, 1959 2 Sheets-Sheet 2 Filed Dec. 31. 1954 flwzfillir %EY United States Patent MATERIAL HANDLING DEVICE Paul Joseph Loisell, Flint, Mich., assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application December 31, 1954, Serial No. 479,084 2 Claims. (Cl. 294-88) This invention relates to material handling devices in general and more particularly to devices for ejecting or withdrawing stamped members from metal stamping presses.

The removal of metal stampings from large stamping presses when performed manually is a dangerous operation. Numerous means'have therefore been proposed for automatically ejecting the stamped members from such presses without requiring that the operator expose himself to danger. Such devices include the Sahlin Iron Hand shown and described in the United States patent to Sahlin 2,275,561. The proposed device is an improveme'nt over the mechanical hand used with the Sahlin apparatus and includes a more eflicient work jaw operating means and a more satisfactory arrangement of the work engaging jaws themselves.

In the drawings:

Figure 1 is a showing of an automatic mechanical arm having the proposed device adapted for use therewith.

Figure2 is a side elevational view of the proposed material handling device;

Figure 3 is a side elevational view of the proposed device as employed to engage a work member.

Figures 4 and 5 are cross-sectional views taken in the planes of lines 4-4 and 5-5, respectively, of Figure 2 looking in the direction of the arrows thereon.

The automatic mechanical arm apparatus shown in Figure l is generally adapted to be secured to the side of a stamping press and to have the arm 12 thereof extended downwardly with the pick-off or ejector device 14 adapted to reach inside the press to engage a workpiece. The stamping press is not shown.

The apparatus 10 comprises a control housing 16 including an air cylinder 18 and having the air cylinder rod 20 connected to a carriage member 22. The carriage member 22 has a bell crank 24 pivotally mounted thereon as at 26. The bell crank 24 includes a cam follower roller 28 which is adapted to engage and follow the cam surface 30 of the housing as the carriage 22 is raised vertically by air cylinder rod 20. The arm 12 is secured to the end of the bell crank 24 and includes an. arm extension 32 telescoped therein and adjustable with respect thereto by means of the adjustment screw 34. A dash pot cylinder 35 and cylinder rod 37 are secured between the housing 16 and carriage member 22 to cushion the end travel of the carriage member.

A fixture 36 is secured to the end of the arm extension 32 for holding the ejector device 14. The fixture 36 includes a screw adjustment means 38 for regulating the angular disposition of the ejector device 14 relative to arm 12 and a clamp means 40 slidably engaging a rod 42 of the ejector device for regulating the stroke length of the device towards the workpiece.

The ejector device 14 includes a base plate 44 with a support member 46 secured to one end thereof. The rod 42, with which the arm 12 of the apparatus 10 is connected, is secured to the support member 46 and 6 base plate 44. An air cylinder 48 is also secured to the support member 46 and extends rearwardly thereof with the rod 42.

A piston rod guide plate 50 is secured to the face of the support member46 by fastening means 52 and has a piston rod 54, actuated by air pressures applied within the air cylinder 48, extended therethrough. The piston rod 54 includes a forked arm connector 56 at the extended end thereof engaging a carrier 58 and secured thereto by pin 60.

The carrier 58 is formed to include a relieved section on its undersurface as at 62. and flanged

side rails

64 and 66 by means of which it may be slidably disposed upon the base plate 44 and guided within guide rails 68 and 70 secured to each side of the base. The carrier 58 also includes parallel spaced side walls 72 formed to provide guide walls 76 and 78 near one end thereof and pivot pin support walls 80 and82, and 84 and 86, near the other end thereof. A control rod 88 has one end disposed between the guide walls 76 and 78 and is retained by a pin 90 extended through the rod and received within guide slots 92 and 94 formed within the walls. The other end of rod 88 is threaded within a member 96 having

fork arms

98 and 100 with pin 102 extended therebetween. A bell crank lever 104 is pivotally supported upon a pivot pin 106 extended between

walls

80 and 82. One end of the bell crank lever 104 is engaged .upon pin 102 and the other end thereof includes a pin jaw memengaging member secured to the end of the carrier 58. A spring member 122, under compression, is engaged 1 between the carrier 58 and the end 124 of rod 88. The spring member 122 is received within a passage 126 formed through the end of the carrier 58 and closed by a plug 128 threaded therein. The spring biases the rod axially to the extent allowed by pin 90 within guide slots 92 and 94 to move bell crank lever 104 so as to maintain the jaw member 112 in the position shown in Figure 2.

A collar member 130 is secured to rod 88 and has a pin 132 extended therethrough and exposed on each side thereof. The side walls 72 and 74 of the carrier 58 are cut away as at 134 to receive the pin and allow limited travel within the extent allowed rod 88.

Stop lugs

136 and 138 are secured upon guide rails 68 and 70 near one end of the carrier 58, and on opposite sides thereof, for engaging pin 132 and limiting relative movement between the carrier 58 and base plate 44. The limited travel allowed the carrier and base plate is shown in Figure 3. The engagement of

lugs

136 and 138 with pin 132 causes the control rod 88 to be prevented from further movement with carrier 58. As the carrier continues its outward movement, control rod 88 acts upon bell crank lever 104 to close the jaw member 112 upon any workpiece such as 140 disposed between the end 118 of the jaw and the work engaging member 120.

In the operation of the automatic mechanical arm apparatus 10 the air cylinder rod 20 is adapted to lift the carriage member 22 causing the cam follower roller 28, in following the cam surface 30, to pivot the bell crank 24 about its pivotal point 26 raising the end of the bell crank and causing the arm 12 to remove the ejector device 14 from within the stamping press. The

reverse operation disposes the ejector device within the stamping press.

As the ejector device 14 is positioned within the stamping press the air cylinder 48 is actuated causing the piston rod 54 to move the carrier 58 relative to the base plate-44. Thestroke of the ejectordevice-14 is adjusted so that the work engaging member 120 secured to the end of the carrier will engage the workpiece 140 at the end of its relative movement. The piston rod 54 in moving the carrier 58 relative to the base plate 44 causes the pin 132 to be engaged by the stop lugs 136 and 133 secured to the base plate. Further forward movement ofthe carrier member causes the lugs to move the control rod 88 relative to carrier 58 through collar 130,

against the action of the biasing spring 122. Axial v movement ofthe rod-88 relative to the carrier 58 is translated through the bell crank lever 104 to cause the work engaging end 118 of the jaw member to engage the workpiece 140 against the end of the carrier member.

The carrier 58 may be returned to its original position with respect to the base plate 44 by means of the air cylinder 48 at the same time that the mechanical arm apparatus is adapted to withdraw the ejector 14 from within the stamping press, or at such other time as is convenient and allows the apparatus to ready itself for picking off the next stamping from the press.

I claim:

1. A work handling device for use with automatic mechanical arm apparatus and which includes a base member adapted to be secured to and supported by said arm apparatus, a carrier member slidably mountedupon said base member,-a work engaging jaw member pivotally mounted upon one end of said carrier and adapted to hold a workpiece to the terminal end of said carrier, work jaw control linkage carried 'by said slide member and connected to said jaw member, power means on said carrier member biasing said control linkage to retain said jaw member in an open position, piston cylinder means secured to said base member and connected to said carrier for moving said carrier relative to said base member, and stop lug means mounted adjacent the end of said base member and disposed for cooperative impinging engagement with said control linkage for over coming said biasing means and activating said control linkage to close said jaw member against the terminal end of said carrier. 5 2. A work handling device for use with automatic mechanical arm apparatus and which includes a base member adapted to be secured to said arm apparatus, a carrier member slidably mounted upon said base member, a work engaging surface provided at the terminal end of said carrier, a work engaging jaw member pivotally mounted near the end of said carrier, a bell crank actuator link pivotally mounted upon said carrier and having one end thereof connected to said jaw member, a control rod having one end connected to the other end of said actuator link, power biasing means mounted in and engaged between said carrier and the other end of said control link for retaining said jaw member in ,an open position through the biased disposition of said control and its eflect upon said actuator link, pistoncylinder'means connected to said carrier for moving said carrier relative to said base member, and stop means provided near the end of said base member for engaging said control rod and moving said rod relative to said carrier for closing said jaw member against the work engagtherebetween, said work engaging surface and said jaw member being juxtaposed when closed to hold said work member in-a plane at the point of engagement normal'to the lineof movement of said carrier member.

References Cited in the file of thispatent UNITED STATES PATENTS UnloadingMachines; 16 pages. Page 16 indicates a printing'date of January 1954.

ing surface of said carrier and engaging a work member 289, Birmingham, Michigan, entitled Sahlin Iron Hand