Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1976-05-20
1977-06-21
Lanham, C.W.
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
74612, 100 53, B21D 5500, F16P 300
Patent
active
040303640
ABSTRACT:
A safety guard for a press brake includes a sheet of rigid transparent material suspended by a pair of first cables from a frame of the press. A lower edge of the sheet is displaced a predetermined distance above a bed of the press providing just enough room so that a forward portion of a workpiece can be slid beneath the lower edge of the sheet and positioned on the bed of the press without providing additional space through which an operator's hands can be inadvertently extended. An operator holds a rearward portion of the workpiece with both hands as a ram of the press comes down during a work cycle to engage and fabricate or form the forward portion of the workpiece positioned on the bed. Just before the fabrication begins, a second pair of cables connected to the sheet and passing through a series of pulleys alternately on the frame and ram of the press operates, as a consequence to movement of the ram, to rapidly move the sheet out of the way of the workpiece. The workpiece usually requires additional space during the fabrication process as it is formed into a different shape. After the fabrication is completed the ram moves upwardly from the bed, and the sheet quickly returns to its original position.
REFERENCES:
patent: 2415462 (1947-02-01), Cherry
patent: 3213992 (1965-10-01), Gustafson
patent: 3269215 (1966-08-01), Lindquist
patent: 3687060 (1972-08-01), Komori
patent: 3913413 (1975-10-01), Walker
Crosby Gene P.
Lanham C.W.
Patti Carmen B.
Rathbun Harold J.
Square D Company
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