Motors: expansible chamber type – Working member position responsive motive fluid control – Working member carries part within working chamber which...
Patent
1995-10-18
1997-12-02
Lopez, F. Daniel
Motors: expansible chamber type
Working member position responsive motive fluid control
Working member carries part within working chamber which...
91407, 92 85B, 92 88, F15B 1522
Patent
active
056924291
ABSTRACT:
A double-acting pneumatic cylinder is characterised by the provision of a pair of sealing elements respectively located on either side of the piston by means of rods slidably mounted in longitudinal bores formed in the piston. At the commencement of the cylinder's in-stroke, the rod and its associated sealing element is in an extended position and serves to seal off the main exhaust port while the piston is still relatively distantly located from the end of its in-stroke. During further in-stroking the piston, air can therefore exhaust only through the auxiliary exhaust port and the motion is thus cushioned. The out-stroke of the cylinder is similarly cushioned over a relatively large distance by virtue of the sealing element adopting an extended position and closing off the main exhaust port, the air exhausting through the auxiliary exhaust port.
REFERENCES:
patent: 2870744 (1959-01-01), Hallerstrom
patent: 3054385 (1962-09-01), Hanna
patent: 3136225 (1964-06-01), Rader
patent: 4043787 (1977-08-01), Foster
patent: 4373427 (1983-02-01), Garlapaty et al.
Imi Norgren GmbH
Lopez F. Daniel
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