US3733093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pull and push safety device for screw socket connections of pipes
Assignee: Individual
•
Filing: 1971-05-20
•
Granted: 1973-05-15
•
Expires: 1991-05-20
Abstract
Abstract The invention relates to a pull and push safety for screw socket connections of pipes, in particular malleable iron pipes, plastic pipes and large diameter pipes, such as for supply networks in cities or the like. In such pipes there is disposed in an annular chamber limited by the plane ends of the pipe and the socket equipped with an internal thread a sealing ring which is sealingly preloaded by a pressure ring screwable into the socket. In such screw socket connections there may occur at the installed pipes extraneously acting pulling forces or pushing forces caused by the internal pressure, tending to loosen the connection between the pipe sections. The sealing rings are able to absorb these forces, which can assume a considerable magnitude, to a limited extent only. Therefore, attempts have already been made to secure such connections against pushing and pulling forces. These known measures are costly, however, because they make necessary special machining operations at the pipe ends, which often can be performed only at the construction site. In addition, the machining of the pipe surfaces, such as cutting in a clamping groove, will weaken the pipe wall which may lead to the premature breakage of the pipe.
Inventors
- 👤 G Seiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:28
CPC Classifications
F; F16; F16L; F16L19/00; F16L19/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
244 words
A pull and push safety device for screw socket connections of pipes having at least one smooth end and at least one socket end, said socket end having an annular internal shoulder, being internally threaded and forming an annular chamber in which the smooth end of a pipe is seated with radial and axial play comprising a pressure ring disposed in said chamber surrounding the smooth end of the pipe and having at least a portion of its radially outer surface provided with threads, thereby threadedly engaging the internally threaded socket end and further having an oblique lower radially inner peripheral surface, said oblique surface having a radially inwardly directed projection emanating therefrom; a safety ring disposed in said chamber surrounding the smooth end of a pipe adjacent the pressure ring and having a degree of radial play and having a greater cross-sectional length than radial cross-sectional width, a radial separating slot adapted to be engaged by said radially inwardly directed projection, sharp-edged, thread-like elevations at the radially inner peripheral surface, said elevations having the same pitch as the threads of the pressure ring, circumferentially spaced apart, radially extending recesses in its inner and outer peripheral surfaces, and a crowned, radially outer peripheral surface adapted to be engaged by the oblique surface of the pressure Ring; and a sealing ring disposed in said chamber surrounding the smooth pipe end, engaging said internal shoulder, and sealingly preloaded by the safety ring and the pressure ring.
Claim 2
Dependent Claim
244 words
A pull and push safety device for screw socket connections of pipes having at least one smooth end and at least one socket end, said socket end having an annular internal shoulder, being internally threaded and forming an annular chamber in which the smooth end of a pipe is seated with radial and axial play comprising a pressure ring disposed in said chamber surrounding the smooth end of the pipe and having at least a portion of its radially outer surface provided with threads, thereby threadedly engaging the internally threaded socket end and further having an oblique lower radially inner peripheral surface, said oblique surface having a radially inwardly directed projection emanating therefrom; a safety ring disposed in said chamber surrounding the smooth end of a pipe adjacent the pressure ring and having a degree of radial play and having a greater cross-sectional length than radial cross-sectional width, a radial separating slot adapted to be engaged by said radially inwardly directed projection, sharp-edged, thread-like elevations at the radially inner peripheral surface, said elevations having the same pitch as the threads of the pressure ring, circumferentially spaced apart, radially extending recesses in its inner and outer peripheral surfaces, and a crowned, radially outer peripheral surface adapted to be engaged by the oblique surface of the pressure Ring; and a sealing ring disposed in said chamber surrounding the smooth pipe end, engaging said internal shoulder, and sealingly preloaded by the safety ring and the pressure ring.
Claim 3
Dependent Claim
27 words
Pull and push safety device according to claim 1, characterized in that pressure ring and safety ring are in mutual connection for joint motion in circumferential direction.
Claim 4
Dependent Claim
36 words
Pull and push safety device according to claim 2, characterized in that the connection between the pressure ring and the safety ring for their joint motion in circumferential direction yields after a predetermined torque is exceeded.
Claim 5
Dependent Claim
38 words
Pull and push safety device according to claim 2, characterized in that the cooperating surfaces of the pressure ring and the safety ring present mutually matching flutes or knurls, preferably extending parallel to the axis of the components.
Claim 6
Dependent Claim
37 words
Pull and push safety device according to claim 1, characterized in that the safety ring consists of two or more annular sectors held together by a ring of elastic or flexible material inserted in a peripheral groove.
References Cited (Backward Citations)
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Cited
US1822887A
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US3139293A
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |