US4095826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Connector for rigid plastics pipes
Assignee: ENDERMILL ANSTALT
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Filing: 1976-11-29
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Granted: 1978-06-20
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Expires: 1996-11-29
Abstract
Abstract Connector for rigid plastic pipes comprises a central cylindrical member wherein the axial bore widens at its two opposite ends to form three portions of predeterminal length and of different diameters, there being provided at each end a pair of semi-circular locking inserts provided internally with suitable toothing, and forming a contractable cylindrical seat adapted to lock both axially and torsionally the pipe inserted therein.
Inventors
- 👤 Elio Borradori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:46
CPC Classifications
F; F16; F16L; F16L19/00; F16L19/08; F16L47/00; F16L47/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
184 words
A connector for rigid plastic pipe comprising a central cylindrical member with an axial bore in the form of three stepped diameters which increase symmetrically from the centre of the member to its respective ends, and into which are inserted the rigid pipes to be connected, the two opposing ends of the cylindrical member being provided with an outer thread, two female elements threaded on said member and each having internally, a cone frustum cavity forming a radial pressure surface, a pair of internally toothed semi-circular locking segments positioned in each end of said member and engageable by said pressure surface of said female element for, forming a contractable cylindrical seat adapted to lock both axially and torsionally the pipe inserted therein, interengaging complimentary recess and projection means on the inner ends of said central member and on the outer wall of each of said locking segments respectively to torsionally constrain both said segments against rotation relative to said members, and cooperating abutment means on each of the segments and the member to prevent axial movement of the segments with respect to the member.
Claim 2
Dependent Claim
184 words
A connector for rigid plastic pipe comprising a central cylindrical member with an axial bore in the form of three stepped diameters which increase symmetrically from the centre of the member to its respective ends, and into which are inserted the rigid pipes to be connected, the two opposing ends of the cylindrical member being provided with an outer thread, two female elements threaded on said member and each having internally, a cone frustum cavity forming a radial pressure surface, a pair of internally toothed semi-circular locking segments positioned in each end of said member and engageable by said pressure surface of said female element for, forming a contractable cylindrical seat adapted to lock both axially and torsionally the pipe inserted therein, interengaging complimentary recess and projection means on the inner ends of said central member and on the outer wall of each of said locking segments respectively to torsionally constrain both said segments against rotation relative to said members, and cooperating abutment means on each of the segments and the member to prevent axial movement of the segments with respect to the member.
Claim 3
Dependent Claim
68 words
A connector according to claim 1 wherein said recess and projection means comprises axially extending recesses in the outermost step of the bore of the cylindrical member, each recess having an end opening through the end of said bore and a length of approximately one half the length of the bore, and ribs on said locking segments and extending into said recesses to prevent rotation of the segments.
Claim 4
Dependent Claim
62 words
A connector according to claim 1 wherein said locking segments each comprise, an interior semi-circular pipe engaging wall, and an outer flared mouth to facilitate inserting a pipe therethrough, said wall having sawtooth teeth extending along approximately two-thirds of its length, and a central axial cut interrupting said teeth, said cylindrical member further comprising axially extending external serrations to facilitate manual gripping.
Claim 5
Dependent Claim
46 words
A connector according to claim 3 wherein said sawtooth teeth extend in parallel concentric rows along each segment in a regularly staggered fashion to create a scale effect, assuring gripping and penetration of the pipe surface despite dirt on the pipe which could prevent effective locking.
Claim 6
Dependent Claim
39 words
A connector according to claim 2 wherein, said female elements each comprise, a body having an internal tapered surface for engaging external tapered surfaces of said locking segments, and a diverging conical mouth to facilitate insertion of the pipe.
Claim 7
Dependent Claim
18 words
A connector according to claim 5 wherein, said female elements each comprise, longitudinal serrations to facilitate manual gripping.
Claim 8
Dependent Claim
68 words
A connector according to claim 1, further comprising, a gasket for sealing between the cylindrical member and the external wall of the pipe, said gasket being positioned between the inner end of the bore containing the locking segments and an end face of the locking segments, said cooperating abutment means on said locking segments and said cylindrical member engaging to prevent and substantial axial compression of said gasket.
Claim 9
Dependent Claim
20 words
A connector according to claim 7, wherein said gasket has a sealing lip engaging the external wall of the pipe.
Claim 10
Dependent Claim
45 words
A connector according to claim 7 wherein said abutment means comprises a shoulder between the ends of each locking segment, and an end face of the bore into which the segment extends, said end face engaging said shoulder to prevent compression of the seal gasket.
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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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |