US4049355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe coupling
Assignee: Individual
•
Filing: 1976-03-26
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Granted: 1977-09-20
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Expires: 1996-03-26
Abstract
Abstract A pipe coupling includes a base portion and a plurality of insertion legs integrally extending from the base portion. Each of the insertion legs has the free end rounded and equally spaced longitudinal ridges so as to effect four side friction fits in the inner periphery of a pipe to be connected. At least one of the ridges is given an elasticity by opposing slots longitudinally provided below the ridge and has a round projection at the outer end portion and an upward slant extending towards the inner end. The extremity of the slant defines a sharp point for preventing the removal of the insertion leg out of the pipe.
Inventors
- 👤 Takashi Kawazu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:42
CPC Classifications
A; A47; A47B; A47B47/00; F; F16; F16B; F16B12/00; F16B12/40; F16B7/00; F16B7/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
179 words
A pipe coupling comprising: a. a base portion having faces equal in diameter to the pipe (11); b. a plurality of insertion legs with a free end rounded, each of said insertion legs (12) being integral with and extending outwards from the base portion; c. equally spaced integral ridges (13) longitudinally extending on said legs so as to provide a friction fit in the inner perphery of a pipe to be connected, at least one of the ridges being given an elasticity by means of opposing slots (14, 15) longitudinally provided below the ridge and defined by a web portion (16) supporting the ridge on the leg, said slots giving elasticity to the end portions of the ridge; d. a round outer projection (17) on said ridge adjacent the outwards end portion and an outer upward slant (18) extending towards the inner end of said ridge, the extremity of the slant defining a sharp point for preventing the removal of the insertion leg out of a pipe and wherein a belt insertion hole is provided in the base portion.
Claim 2
Dependent Claim
179 words
A pipe coupling comprising: a. a base portion having faces equal in diameter to the pipe (11); b. a plurality of insertion legs with a free end rounded, each of said insertion legs (12) being integral with and extending outwards from the base portion; c. equally spaced integral ridges (13) longitudinally extending on said legs so as to provide a friction fit in the inner perphery of a pipe to be connected, at least one of the ridges being given an elasticity by means of opposing slots (14, 15) longitudinally provided below the ridge and defined by a web portion (16) supporting the ridge on the leg, said slots giving elasticity to the end portions of the ridge; d. a round outer projection (17) on said ridge adjacent the outwards end portion and an outer upward slant (18) extending towards the inner end of said ridge, the extremity of the slant defining a sharp point for preventing the removal of the insertion leg out of a pipe and wherein a belt insertion hole is provided in the base portion.
Claim 3
Dependent Claim
32 words
A pipe coupling as claimed in claim 1, wherein the face of the base portion abutting the end of the pipe has the same diameter and shape as those of the pipe.
References Cited (Backward Citations)
FR1073078A
Cited
FR1188571A
Cited
GB1031787A
Cited
US3799685A
Cited
US3873220A
Cited
US3858989A
Cited
US3932046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |