Control valve means

Details Control valve means Control valve means

1993-11-16

1994-12-06

Look, Edward K.

Motors: expansible chamber type

Cyclically operable

Multiple exhaust passages

91274, 91321, 91415, F01L 1500, F15B 1517

Patent

active

053700376

ABSTRACT:
The present invention relates to a valve control apparatus for operating a working piston, comprising a main valve spool including a smaller piston face subjected to compressed air from a reservoir and a larger piston face facing a main control space, further comprising an auxiliary valve spool having a first effective area which can be connected by a trigger valve to atmosphere or to a compressed air reservoir to displace the main control spool into an open position, and having a second effective area which is connected to a piston stroke chamber for displacing the main valve spool into a closed position, wherein the auxiliary valve spool is returned when the pressure acting on its second effective area falls below a predetermined value, wherein this effective area is connected to a shift valve which communicates with atmosphere when the trigger is not actuated and which is closed when being actuated and wherein the trigger is provided to move a first length of travel and a second length of travel to actuate the shift valve, while the trigger valve is maintained to be activated, wherein the shift valve has a tappet which closes an outlet opening connecting the second effective area to atmosphere when the tappet is moved over an open position and wherein the tappet is moved beyond the open position when the trigger is moved a second length of travel, and wherein the tappet is biased towards the open position.

REFERENCES:
patent: 3255674 (1966-06-01), Nelson et al.
patent: 3547003 (1970-12-01), Ramspeck
patent: 3685396 (1972-08-01), Obergfell
patent: 4716813 (1988-01-01), Prudencio

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