Cylinder and piston for compressor or vacuum pump

Details Cylinder and piston for compressor or vacuum pump Cylinder and piston for compressor or vacuum pump

1994-11-14

1996-02-27

Denion, Thomas E.

Expansible chamber devices

With guide or seal on cylinder end portion for piston or...

92DIG1, 74 44, 384 11, F16J 1518

Patent

active

054939534

ABSTRACT:
A cylinder and piston construction for a compressor or vacuum pump has a cylinder defined by co-axial cylinder and guideway sleeves. The guideway sleeve is larger in diameter than the cylinder sleeve and the cylinder sleeve extends axially into the guideway sleeve. A piston has a cylindrical base which is guided via skirt bearings in the guideway and a head which extends from the base into the compression chamber defined by the cylinder sleeve and has a piston ring which forms a sliding seal with the cylinder sleeve. An annular cavity is defined between the piston head and the piston base into which the cylinder sleeve extends so that the top skirt bearing is positioned closer to the top of the piston head and further away from the bottom skirt bearing so as to steadily guide the piston head in the cylinder sleeve, thereby reducing wear and increasing the life of the pump.

REFERENCES:
patent: 1052521 (1913-02-01), Scott
patent: 1405403 (1922-02-01), Everett
patent: 2049570 (1936-08-01), Schoene
patent: 2057158 (1936-10-01), Moffitt
patent: 3367276 (1968-02-01), Hatsuta
patent: 3656414 (1972-04-01), Muller
patent: 3906923 (1975-09-01), Harker
patent: 4669369 (1987-06-01), Holt et al.
Applicant's Exhibit 1, drawing of Pneumotive Division, Thomas Industries, Inc. dated Jul. 19, 1994 entitled "Present Design 2 Stage Oiless Compressor," admitted prior art.

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