Metal deforming – By plural tool-couples
Patent
1980-06-16
1982-08-03
Crosby, Gene
Metal deforming
By plural tool-couples
72461, 83228, 267137, 408 79, B21D 1122
Patent
active
043422144
ABSTRACT:
A pilot assembly as for locating a workpiece in successive forming stages of a machine, such as a punch press, where the workpiece is progressively moved through the forming stages of the machine. The pilot assembly includes a pilot pin mounted to a movable die member of the machine for guiding entry into a previously formed hole in a workpiece or in a companion die member as the die members are moved toward each other, the pin being axially retractable in its mounting in the event it strikes an obstruction. The retraction movement of the pin is controlled by a hydraulic mechanism which includes a hydraulic chamber formed behind the pin into which the pin moves to displace a hydraulic fluid therefrom, a relief chamber communicating with the hydraulic chamber through interconnecting passageways, a first valve closing against flow of hydraulic fluid from the hydraulic chamber to the relief chamber to prevent displacement of fluid therefrom and thereby oppose pin retraction in normal operation, a second valve in parallel with the first valve for returning hydraulic fluid displaced by the retraction of the pin into the hydraulic chamber, and a pressurized compressible gas contained in the relief chamber to return the displaced hydraulic fluid therefrom to the hydraulic chamber and thereby to drive the pilot pin to its normal position when retraction force is removed from the pin.
REFERENCES:
patent: 2268856 (1942-01-01), Cummings
patent: 3000249 (1961-09-01), Foskett
patent: 3338084 (1967-08-01), Stegman
patent: 3981060 (1976-09-01), Alling
patent: 4024593 (1977-05-01), Pendell
patent: 4088005 (1978-05-01), Starr
patent: 4114218 (1978-09-01), Pendell
patent: 4153237 (1979-05-01), Supalla
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