GB832705A - Improvements in or relating to pipe couplings - Google Patents

Abstract

832,705. Pipe couplings. AEROQUIP CORPORATION. April 8, 1957 [Jan. 31, 1957], No. 11443/57. Class 99(1). Couplings A and B having self-closing valves 32, 84 respectively are connected by means including a sleeve 50 which is rotated against spring action until it reaches a position where locking is effected and the valves fully open. Coupling A.-Fixed to a hollow cylindrical part 10 is a member 16 having external quick action screw threads 18 and a flat sided flange 27. A movable valve has a face 32 which engages a corresponding surface 30 within the part 16 and has a sleeve part 34 which engages the bore of the part 10, the valve being urged to a closed position by a coil spring 40 which is engaged at one end by a shoulder 42 in the part 10 and by an abutment 44 in the valve at the other end. An o-ring 46 provides a seal between the valve head and the interior of the part 16 in which it is contained in a recess. Coupling B.-Sleeve 50 contains a member 48 which has internal screw threads 52 to engage the screw threads 18 and an external recess 58 in which engages a pin 60 carried by the sleeve. The pin permits axial travel of the part 48 within the sleeve, the movement being limited by a flange 62, a spring 64 being inserted between the parts 48 and sleeve 50 to urge the flange 62 against the pin 60. The outer end of sleeve 50 is formed with a recess which corresponds to the flange 27 on coupling A which effects locking engagement on mating. A sleeve part 70 is secured in the member 48 by a flange 72 at one end and a clip 74 at the other and which houses a valve with a bevelled head 84 enclosed in a sleeve 88 and secured to the part 70. The sleeve 88 has a bevelled interior end surface 90 to correspond with the valve head and is slidably mounted on the stem portion 78, a coil spring 94 urging the sleeve 88 to the valve head position so that it remains closed. Operation.-The sleeve 50 of coupling B is advanced on coupling A and as the screw threads are engaged, the seal ring 46 becomes effective. The valves have ports in their bevelled surfaces which remain closed by spring action until the valves are unseated. Rotation of sleeve 50 causes the part 48 to engage the part 16 and the valves which are face-to-face move to the left and further compress spring 40. Release of the sleeve 50 will cause the couplings to unscrew and fall apart under pressure of the springs. Continued rotation of the sleeve will eventually bring the recess 68 into mating relation with flange 27 when the compressed spring 64 causes the sleeve 50 to spring to fully engage the recess and flange and the couplings are locked together. The number of leads on the screw threads 18, 52 should equal the number of flats in recess 68 and on flange 27, e.g. if there are six-screw-thread leads and six flats, there will be six locking mating positions. Specification 656,483 is referred to.