Motors: expansible chamber type – Cyclically operable – Biasing means moves distributor after predetermined travel
Reexamination Certificate
2000-02-08
2001-07-24
Ryznic, John E. (Department: 3745)
Motors: expansible chamber type
Cyclically operable
Biasing means moves distributor after predetermined travel
C091S350000
Reexamination Certificate
active
06263777
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to control systems for reciprocating devices.
BACKGROUND OF THE INVENTION
Some conventional switching valves have a toggle that is operated by a trigger on a reciprocating unit to change the direction of movement of the reciprocating unit. The toggle is used to operate a valve that directs fluid flow into or away from a diaphragm (piston or like device) that operates the reciprocating unit. The toggle passes through a middle position where flow is only partially directed to the middle position. In this partial flow position, at low speeds of operation, the toggle may become stuck in a flutter mode where the reciprocating unit oscillates over a much reduced range of motion, insufficient to drive the toggle into a fully switched position in either direction. The present invention is intended to overcome this problem with such prior art switching valves.
SUMMARY OF THE INVENTION
Therefore, according to an aspect of the invention, there is provided a control system for a reciprocating device. The control system includes a switching valve having a fluid supply inlet, an exhaust outlet, a restrictor on the exhaust outlet, a drive line, a valve operable to connect one of the exhaust outlet and the fluid supply inlet to the exhaust outlet and a toggle for operating the valve, the toggle being movable by motive force through an arc between a first position in which fluid flow is from the fluid supply inlet to the drive line and a second position in which fluid flow is from the drive line to the exhaust outlet, the toggle passing through a middle position where fluid flow may flow from the drive line to the exhaust outlet and from the fluid supply inlet to the drive line. A reciprocating device is provided that is operable to move in a first direction due to fluid pressure in the drive line and a second, opposed, direction due to a motive force activator when pressure in the drive line is reduced. A trigger on the reciprocating device moves with the reciprocating device. A connector is disposed between the trigger and the toggle. The connector being operable to move the toggle into the first position when moving in the second direction and to move the toggle into the second position when moving in the first direction. The connector includes a spring or springs arranged to transmit forces from the trigger to the toggle when the trigger is moving in one or both of the first direction and the second direction, the spring storing energy while moving in the one or both of the first direction and the second direction to force the toggle through the middle position.
The connector preferably comprises a pivoting member, the pivoting member having a trigger opening for receiving the trigger and a toggle opening for receiving the toggle, the spring being located adjacent the opening for receiving the toggle. The trigger opening is preferably on a side of the pivoting member opposed to the toggle opening. The pivot is preferably disposed between the toggle opening and the trigger opening. The pivoting member is preferably a plate and the spring is housed in a slot that terminates at the toggle opening. The spring is preferably secured in the slot by a slider and a stop. The pivot is preferably fastened to the toggle valve.
REFERENCES:
patent: 51454 (1865-12-01), Guild et al.
patent: 886442 (1908-05-01), Tittle
patent: 933637 (1909-09-01), Farrell
patent: 1750634 (1930-03-01), Forsberg
patent: 3561325 (1971-02-01), Lamb et al.
patent: 3598019 (1971-08-01), Killian
patent: 458221 (1949-07-01), None
patent: 164925 (1921-06-01), None
patent: 305686 (1929-01-01), None
Lambert Anthony R.
Plainsman Mfg. Inc.
Ryznic John E.
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