Pressure unloading valve to cushion a pneumatic cylinder

The pressure in the downstream side of a pneumatic cylinder's piston (1g) is allowed to exhaust. At a certain point, the downstream exhaust is blocked, causing the pressure to rise against the downstream side of the piston. A valve (5) opens when the downstream chamber has reached its maximum p...

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Bibliographische Detailangaben
1. Verfasser:	BURHOE JOHN C. A
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS HEATING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	The pressure in the downstream side of a pneumatic cylinder's piston (1g) is allowed to exhaust. At a certain point, the downstream exhaust is blocked, causing the pressure to rise against the downstream side of the piston. A valve (5) opens when the downstream chamber has reached its maximum pressure. The output of valve (5) opens a second valve (3). Valve (3) rapidly exhausts the remaining air on the downstream side of the piston (1p). With no air on the downstream side of piston (1p), piston (1p) stops and does not bounce back. Changing the volume of inactive regions (1m) or (1n) sets the stopping point to coincide with the end of stroke of piston (1p). A check valve (4) and orifice (6a) allow the air in the pilot port in valve (3) to slowly bleed out, resetting valve (3) for the next cycle.