Rod sealing system

Details Rod sealing system Rod sealing system

2006-12-05

2011-11-15

Pickard, Alison (Department: 3674)

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

C277S530000, C277S439000, C277S567000

Reexamination Certificate

active

08056903

ABSTRACT:
In a rod sealing system, which comprises a buffer ring, a rod seal, and a dust seal, provided successively in this order from a fluid hydraulic side toward the outside in an annular clearance between two members in reciprocating motion, the buffer ring is made up of a thermoplastic polyurethane molding product obtained by subjecting a thermoplastic polyurethane molding product prepared by reaction of (A) a high molecular weight polycarbonatediol having a number average molecular weight Mn of 500-6,000, (B) an aromatic diisocyanate, and (C) a low molecular weight diol as a chain elongation agent in an NCO/OH ratio of 0.95-1.20, to heat treatment under conditions that a glass transition point (Tg) of hard phases becomes 170° C. or higher, preferably 170-230° C., and an endothermic peak area (ΔH) at Tg becomes 5 J/g or more, by differential scanning calorimetry. The buffer ring made up of the thermoplastic polyurethane molding product has a distinguished heat resistance capable of withstanding the service environmental temperature, particularly maximum 120° C., compression set characteristics, follow-up to eccentricity, etc.

REFERENCES:
patent: 3195901 (1965-07-01), Mercier
patent: 3738665 (1973-06-01), Bilco
patent: 4284280 (1981-08-01), Bertram et al.
patent: 4867460 (1989-09-01), Colo et al.
patent: 5066762 (1991-11-01), Ohbuchi et al.
patent: 5088745 (1992-02-01), Peppiatt et al.
patent: 5100999 (1992-03-01), Murai et al.
patent: 5303934 (1994-04-01), Elliott
patent: 6113108 (2000-09-01), Friend et al.
patent: 6538075 (2003-03-01), Krech et al.
patent: 6609716 (2003-08-01), Friend et al.
patent: 7083170 (2006-08-01), Borstel et al.
patent: 7476484 (2009-01-01), Sailer et al.
patent: 2009/0166984 (2009-07-01), Matsui et al.
patent: 01-095119 (1989-04-01), None
patent: 02-269113 (1990-11-01), None
patent: 04-211033 (1992-08-01), None
patent: 04-332716 (1992-11-01), None
patent: 06-116354 (1994-04-01), None
patent: 06-288477 (1994-10-01), None
patent: 07-228661 (1995-08-01), None
patent: 2000-009106 (2000-01-01), None
patent: 2001-355739 (2001-12-01), None

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