Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part
Patent
1976-12-10
1978-08-08
Lanham, C. W.
Metal deforming
With use of control means energized in response to activator...
Sensing tool or tool-linked part
72425, 72419, 91403, 91404, B21D 4300, B21J 1308, F15B 1522
Patent
active
041048997
ABSTRACT:
A pneumatically buffered drive system is provided which quickly moves a movable member, such as a press safety curtain or press bolster, a predetermined length in three sequential speed stages to prevent maximum acceleration from occurring at the end of the predetermined length. The movable member is coupled to a differential pressure piston which is initially pressurized on only one side of the piston to initiate movement. After traversing approximately half the predetermined length both sides of the piston are pressurized to decelerate the piston during the member movement for approximately the next third of the predetermined length. The remaining length is traversed with the decelerating pressure being vented to positively finish the motion along the predetermined path. In vertical moving members having significant mass such as press safety curtains, a higher pressure is used to decelerate the piston than the pressure used to drive the piston. The higher decelerating pressure is required to effectively compensate for the momentum of the accelerated vertical member.
REFERENCES:
patent: 3149536 (1964-09-01), Hewitt
patent: 3216444 (1965-11-01), Herner
patent: 3272083 (1966-09-01), Stoll
patent: 3479924 (1969-11-01), Ferguson
patent: 3826119 (1974-07-01), Marotto
patent: 3910420 (1975-10-01), Rich
patent: 3926032 (1975-12-01), Brooks
patent: 3935811 (1976-02-01), Lenz
patent: 3937056 (1976-02-01), Henzler
Gurley D. M.
Lanham C. W.
Maguire Joseph M.
Matas Vytas R.
The Babcock & Wilcox Company
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