Reciprocable piston with a fluid scavenging system and...

Details Reciprocable piston with a fluid scavenging system and... Reciprocable piston with a fluid scavenging system and...

2006-10-10

2006-10-10

Lazo, Thomas E. (Department: 3745)

Expansible chamber devices

With lubricating means

Piston has lubricant retaining or conducting means

C092S160000

Reexamination Certificate

active

07117783

ABSTRACT:
A reciprocable piston comprises a cylindrical body reciprocable within a hollow cylinder and at least two spaced ring seals disposed around the circumference of the cylindrical body. Within the cylindrical body there is a scavenging system that comprises: an internal chamber that is in fluid communication with a space between the spaced ring seals; and a one-way fluid passage that allows one-way fluid flow from the internal chamber to the cylinder chamber when fluid pressure within the internal chamber is greater than fluid pressure within the cylinder chamber. A method of scavenging fluid comprises collecting fluid that leaks by a piston seal and returning the collected fluid to the cylinder chamber from which it originated, through a scavenging system disposed within the piston.

REFERENCES:
patent: 5807083 (1998-09-01), Tomoiu
patent: 1173297 (1964-07-01), None
patent: 3902658 (1990-08-01), None
patent: 3902658 (1990-08-01), None

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