Ferrous pipe couplings and prelubricated coupling gaskets
First Claim
Patent Images
1. A lubricated ferrous pipe coupling gasket comprising:
- a generally tubular, one-piece, elastomeric member with first and second axial open ends, the member being formed by a circumferential wall and at least a pair of circumferential flanges, each flange extending at least generally radially inwardly at a separate one of the first and second axial open ends of the member, the circumferential wall and the pair of circumferential flanges forming at least one circumferential channel on an inner circumferential side of the member; and
a coating of dry powder lubricant on at least the inner circumferential side of the member.
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Accused Products
Abstract
One-piece, elastomeric gaskets for ferrous pipe couplings and the like are prelubricated with a coating of dry powder lubricant before installation. This coating can be applied before installation and as early as assembly by the manufacturer. The gaskets are combined with split ring collars to form couplings for pneumatic and hydraulic piping systems, including fire sprinkler systems, among others. The lubricant can be an organic starch powder derived from corn, rice, potatoes or other crops, talc or its primary ingredient, magnesium silicate hydroxide, or a combination of organic or organic and inorganic lubricant powders.
58 Citations
20 Claims
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1. A lubricated ferrous pipe coupling gasket comprising:
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a generally tubular, one-piece, elastomeric member with first and second axial open ends, the member being formed by a circumferential wall and at least a pair of circumferential flanges, each flange extending at least generally radially inwardly at a separate one of the first and second axial open ends of the member, the circumferential wall and the pair of circumferential flanges forming at least one circumferential channel on an inner circumferential side of the member; and
a coating of dry powder lubricant on at least the inner circumferential side of the member. - View Dependent Claims (2, 3, 4)
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5. A ferrous pipe coupling comprising:
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a ferrous collar having an outer, axially extending, axially split circumferential wall with at least one pair of adjoining circumferential ends at the split;
at least one fastener releasably securing together the at least one pair of adjoining, circumferential ends of the collar;
a gasket in the form of a generally tubular, one-piece elastomeric member positioned in the collar and having an exposed inner circumferential side exposed in the collar; and
a coating of dry powder lubricant on at least the exposed, inner circumferential side of the elastomeric member. - View Dependent Claims (6, 7, 8, 9)
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10. A ferrous piping system comprising:
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a plurality of ferrous piping components; and
at least one ferrous pipe coupling mechanically and fluidly joining together ends of a pair of the piping components at a joint;
the ferrous pipe coupling including a ferrous collar having an outer, axially extending and axially split, circumferential wall and at least one pair of adjoining circumferential ends at the split;
the ferrous pipe coupling further including a gasket in the form of a generally tubular, one-piece elastomeric member having an inner circumferential side sealingly mounted on the ends of the pair of piping components and surrounded by the collar;
the ferrous pipe coupling further including a coating of cornstarch powder at least between the inner circumferential side of the gasket and the ends of the pair of piping components; and
the ferrous pipe coupling further including at least one fastener releasably securing together a pair of adjoining, circumferential ends of the collar so as to compress the gasket and the collar on the ends of the pair of piping components. - View Dependent Claims (11, 12, 13, 14, 15)
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- 16. In a ferrous pipe coupling including a generally tubular, one-piece, elastomeric gasket, a ferrous collar surrounding the gasket, the collar including at least one axial split defining a pair of adjoining circumferential ends, and a fastener releasably securing together the adjoining circumferential ends of the collar, the improvement including a coating of dry powder lubricant on at least an inner circumferential side of the gasket.
Specification