Expansible chamber devices – With lubricating means – Piston has lubricant retaining or conducting means
Reexamination Certificate
2005-08-16
2005-08-16
Look, Edward K. (Department: 3745)
Expansible chamber devices
With lubricating means
Piston has lubricant retaining or conducting means
C092S168000, C277S438000
Reexamination Certificate
active
06928922
ABSTRACT:
Seal sections, which support first and second piston rods, are provided on inner circumferential surfaces of first and second cover members of a cylinder mechanism. A lubricant is supplied via supply passages and oil supply ports to first oil-retaining members, which are installed in installation grooves provided in the seal sections. The lubricant, which has characteristics different from those of an operation oil used for driving a piston of the cylinder mechanism, is retained by the first oil-retaining members. Further, the lubricant is supplied to clearances formed between the first and second cover members and the first and second piston rods, thereby forming an oil film.
REFERENCES:
patent: 5480161 (1996-01-01), Borowski
patent: 6615705 (2003-09-01), Reinelt et al.
patent: 0 547 009 (1993-06-01), None
patent: 5-248412 (1993-09-01), None
patent: 2003-139108 (2003-05-01), None
Co-pending U.S. Appl. No. 10/902,044 by Shigekazu Nagai et al., filed on Jul. 30, 2004.
Nagai Kotaro
Nagai Shigekazu
Saitoh Akio
Guss Paul A.
Hanan Devin
Look Edward K.
SMC Kabushiki Kaisha
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