Coupler for hydraulic lines

摘要

996,408. Pipe coupling. PIONEER HYDRAULICS Inc. Nov. 6, 1963 [Nov. 19, 1962], No. 43894/63. Heading F2G. A readily releasable pipe coupling comprises two interfitting body members 11, 12, the bores 13, 14 of which are reduced in diameter to form valve seats 15, 17 which receive ball valves 16 18, the said bores also housing valve shields and guiding members 25, 19 carrying compression springs 28, 24 urging the ball valves on to their seats. The valve shield 25 has a closed rear end 26 and carries the spring 28 which is substantially stronger than the spring 24, preferably twice as strong. Situated within the shield is a stop member 27 allowing a total retraction of the ball valve 16 of more than twice the amount retracted in a normal open position (Fig. 3). The other shield 19 carries a slidable stop member 23 having shoulders coacting with the end wall 20 of the shield to limit the retraction of the valve. In operation the member 12 connected to an implement contains fluid under pressure, which acts on the end face of stop 23 to aid the spring 24 to keep the valve closed. On connection, the fluid pressure and spring cause valve 18 to open valve 16 beyond its usual operating position (Fig. 2, not shown). When fluid from the pressure source enters member 11, the pressure with the aid of the stronger spring 28 forces open the valve 18 to its limiting position such that both valves are equally spaced from their seats. The coupling is held closed by balls 29 held in seats in the member 12 by a retractible sleeve 30 arranged such that at all times it wholly or partially overrides the balls.