Presses – Portable receptacle lid applying – With gathering of contents
Patent
1975-06-18
1977-07-05
Lanham, C.W.
Presses
Portable receptacle lid applying
With gathering of contents
100DIG18, 74615, 91165, 91397, 91405, 192134, 92 82, 82 85B, 72425, 72420, 83397, B21D 4300, B21J 1308, F15B 1522, F16P 100
Patent
active
040332500
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: 2612951 (1952-10-01), Palmleaf
patent: 2780204 (1957-02-01), Barley
patent: 3149536 (1964-09-01), Hewitt
patent: 3370428 (1968-02-01), Van Deberg
patent: 3479924 (1969-11-01), Ferguson
patent: 3641841 (1972-02-01), Komori
patent: 3865218 (1975-02-01), Jones
patent: 3904416 (1975-09-01), Onoda
patent: 3910420 (1975-10-01), Rich
patent: 3913413 (1975-10-01), Walker
patent: 3935811 (1976-02-01), Lenz
Gurley D. M.
Lanham C.W.
Maguire Joseph M.
Matas Vytas R.
The Babcock & Wilcox Company
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