US4871198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated plastic pipe coupling
Assignee: Furukawa Electric Co Ltd
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Filing: 1988-02-22
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Granted: 1989-10-03
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Expires: 2008-02-22
Abstract
Abstract A clamp-type corrugated plastic pipe coupling of the invention, which is clamped with a split mold having flanges, includes an outer coupling member having a corrugation at least on its inner surface and a packing member arranged inside the outer coupling member. The packing member has an inner surface with a corrugation substantially identical to the corrugations on outer surfaces of corruated plastic pipes to be connected. The packing member is made of a material having a rubber hardness of not more than 25 and a compression set of not more than 60%. The corrugated plastic pipe coupling having the above structure has watertightness which can sufficiently withstand a water pressure of 5 kg/cm 2 or more even when it is subjected to heat cycles between -25° and 80° C.
Inventors
- 👤 Kenichi Hattori
- 👤 Kazuya Imamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:19
CPC Classifications
H; H02; H02G; H02G9/00; H02G9/06; F; F16; F16L; F16L25/00; F16L25/0036; H02G3/00; H02G3/02; H02G3/04; Y; Y10; Y10S; Y10S285/00; Y10S285/903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
168 words
A clamp-type corrugated plastic pipe coupling, comprising: split mold means adapted to surround outer surfaces of corrugated plastic pipes to be connected; an outer coupling member adapted to be received within said split mold means and having a corrugation at least on its inner surface; and a packing member arranged inside said outer coupling member, wherein the packing member is urged against the outer surfaces of the pipes to be connected when said outer coupling member is clamped from the outside by said split mold means, the corrugation on the inner surface of said outer coupling member corresponds in form to corrugations on the outer surfaces of the pipes to be connected, said packing member has an inner surface with a corrugation that conforms substantially identically to the corrugations on the outer surfaces of the corrugated plastic pipes to be connected, and said packing member is made of a material having a rubber hardness of not more than 25 and a compression set of not more than 60%.
Claim 2
Dependent Claim
168 words
A clamp-type corrugated plastic pipe coupling, comprising: split mold means adapted to surround outer surfaces of corrugated plastic pipes to be connected; an outer coupling member adapted to be received within said split mold means and having a corrugation at least on its inner surface; and a packing member arranged inside said outer coupling member, wherein the packing member is urged against the outer surfaces of the pipes to be connected when said outer coupling member is clamped from the outside by said split mold means, the corrugation on the inner surface of said outer coupling member corresponds in form to corrugations on the outer surfaces of the pipes to be connected, said packing member has an inner surface with a corrugation that conforms substantially identically to the corrugations on the outer surfaces of the corrugated plastic pipes to be connected, and said packing member is made of a material having a rubber hardness of not more than 25 and a compression set of not more than 60%.
Claim 3
Dependent Claim
24 words
A coupling according to claim 1, wherein the material of said outer coupling member is a selected one of a plastic and a metal.
Claim 4
Dependent Claim
33 words
A coupling according to claim 1, wherein the corrugation on the inner surface of said outer coupling member is a selected one of a helical corrugation and a set of unconnected spaced corrugations.
Claim 5
Dependent Claim
19 words
A coupling according to claim 1, wherein a corrugation is formed on the outer surface of said packing member.
Claim 6
Dependent Claim
32 words
A coupling according to claim 4, wherein the corrugation on the outer surface of said packing member is a selected one of a helical corrugation and a set of unconnected spaced corrugations.
Claim 7
Dependent Claim
32 words
A coupling according to claim 1, wherein the corrugation on the inner surface of said packing member is a selected one of a helical corrugation and a set of unconnected spaced corrugations.
Claim 8
Dependent Claim
35 words
A coupling according to claim 1, wherein the material of said packing member is a member selected from the group consisting of vulcanized butyl rubber, an ethylene-propylene copolymer, a styrene butadiene-based elastomer, and natural rubber.
Claim 9
Dependent Claim
33 words
A coupling according to claim 2, wherein the corrugation on the inner surface of said outer coupling member is a selected one of a helical corrugation and a set of unconnected spaced corrugations.
Claim 10
Dependent Claim
35 words
A coupling according to claim 4, wherein the material of said packing member is a member selected from the group consisting of vulcanized butyl rubber, an ethylene-propylene copolymer, a styrene butadiene-based elastomer, and natural rubber.
Claim 11
Dependent Claim
35 words
A coupling according to claim 5, wherein the material of said packing member is a member selected from the group consisting of vulcanized butyl rubber, an ethylene-propylene copolymer, a styrene butadiene-based elastomer, and natural rubber.
Claim 12
Dependent Claim
35 words
A coupling according to claim 6, wherein the material of said packing member is a member selected from the group consisting of vulcanized butyl rubber, an ethylene-propylene copolymer, a styrene butadiene-based elastomer, and natural rubber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |