Pipe joints or couplings – With casing – lining or protector
Patent
1998-08-10
1999-11-30
Arola, Dave W.
Pipe joints or couplings
With casing, lining or protector
285319, 285423, 285921, F16L 1112
Patent
active
059928956
ABSTRACT:
A plug-in coupling connects a first fluid duct to a second fluid duct. The first fluid duct has at least one retaining rib disposed on an outer peripheral surface thereof. The plug-in coupling includes a sleeve having a plurality of radial openings. Each of the radial openings has a front edge. The sleeve has an inner shoulder disposed on an inner peripheral surface thereof. A cylindrical locking device is received and is axially displaceable within the sleeve. The locking device has at least two axially extending, elastically flexible retaining arms depending from the locking device. A free end of each of the retaining arms is hook-shaped for selectively engaging the retaining rib when the first fluid duct is inserted into the locking device. Each of the free ends has a radially outwardly facing inclined face that abuts against the front edge of one of the radial openings in the sleeve when the sleeve and the locking device are axially displaced away from each other thereby increasing the engagement force applied by the hook-shaped free end to the retaining rib. Each of the free ends has a radially inwardly facing inclined face that is disposed adjacent to the retaining rib when the first fluid duct is inserted in the locking device. The locking device has at least two release arms depending therefrom. One of the release arms is disposed between two of the retaining arms. Each of the release arms projects radially outwardly through one of the radial openings in the sleeve. Each of the release arms is axially displaceable with respect to the sleeve. A plurality of axially extending ribs are disposed on an inside peripheral surface of the sleeve. At least one sealing ring is disposed between the inner shoulder of the sleeve and the locking device. Each of the axially extending ribs is disposed between one of the retaining arms and one of the release arms of the locking device. Each of the ribs is disposed adjacent to the retaining rib when the first fluid duct is inserted into the locking device.
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patent: 5167431 (1992-12-01), Maifredi
patent: 5284369 (1994-02-01), Kitamura
patent: 5320390 (1994-06-01), Kodama
patent: 5511827 (1996-04-01), Steinkamp et al.
patent: 5575512 (1996-11-01), Umezawa
Arola Dave W.
Rasmussen GmbH
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