Patent GB-737407-A (GB)
Title: Improvements in or relating to arrangements for the remote-control of parts such as watertight doors in ships or for similar applications
IPC: B63B19/00
Filed: 1952-12-02
Abstract: 737,407. Door - operating appliances. MERCIER, J. Dec. 2, 1952 [Dec. 20, 1951], No. 30592/52. Addition to 713,666. Class 65(1). [Also in Group XXIX] In the arrangement claimed in the parent Specification, as applied to the operation of a watertight bulkhead door P, Fig. 1, the main pump 10 is directly connected to the side of the hydraulic jack 23 which determines the closing movement of the door, and means are provided to counteract the action of said pump at will. The branch delivery pipe 12a from the main pump contains a non-return valve 16 and divides into a branch 18 connected to the distributor valve 20 and a branch 21 connected to the head 36 of the jack. A pipe 34 connects the head to the distributer, this connection being normally closed by a spring-biased ball valve 39 contined in the head. The jack cylinder, which contains a piston 41, communicates with the head through an aperture 37, and is connected to the distributer by a pipe 44. The delivery pipe 46 of a local pump 49 is connected to the distributer, and a return pipe 14a, common to both pumps, is connected by a pipe 50 to the distributer. The latter contains a piston 24 connected by a piston rod 25 to a lever 27 pivoted at 28 and biased by a spring 29 to maintain the distributer piston normally in its lowest, and door-closing, position. The piston is formed with a peripheral groove 32 and an axial passage 31. With the distributer in the door-closing position, pump 49 when operated supplies fluid via pipe 46, groove 32 and pipe 34 to the head of the jack for closing the door, fluid from the jack returning via pipe 44, the passage 31 and pipe 50. Pump 10 when operated supplies fluid via pipes 12a and 21 to the head of the jack, flow through pipe 18 being prevented by the piston 24. When lever 27 is raised to the dooropening position, fluid from pump 49 can flow through pipes 46 and 44 to the jack for opening the door, fluid from the jack head returning via pipes 21, 18, groove 32 and pipes 50 and 14a. Operation of pump 10 will then cause fluid to flow in pipes 12a, 18, 50 and 14a to by-pass the jack. In the modification shown in Fig. 3, in addition to a central pump 60 situated in the hold of the ship, a central emergency pump 62 is provided above the water line and is connected directly to the head 87 of the hydraulic jack 84 by a branch circuit comprising pipes 99, 93 and a non-return valve 100. The distributer 74 contains a piston 107 formed with peripheral grooves 108, 109. The distributer piston is normally maintained in a mid neutral position as shown, and it may be either raised by a lever 112 to the door-closing position, or lowered by the lever to the door-opening position, the controlling means for the lever being of the kind described in the parent Specification. When the piston is in the neutral position it closes a pipe 64 connected to the delivery pipe 61 of pump 60 to isolate the latter from the jack. Pump 62 can then supply fluid to the jack for closing the door, the fluid returning via pipe 81, groove 109 and pipes 76, 67 and 63. Pipe 97, connected between the delivery pipe of pump 62 and the distributer is closed by the piston 107. When the latter is lowered, fluid can flow via pipe 64, groove 108 and pipe 90 to the jack head to close the door, and can return via pipe 81, groove 109 and pipes 76 and 67. Pump 62 can also supply fluid to the jack head, pipe 97 still being kept closed by the piston 107. When the latter is fully raised, fluid can flow from pump 60 via pipes 64 and 81 to move the jack piston in the opening direction, and can return via pipes 93, 97, 75 and 67. Operation of pump 62 then causes flow of fluid in pipes 99, 97, 75, 67 and 63 to by-pass the jack. A pressure accummulator 72 is connected to pipe 64 adjacent the door. In a further modification, a local pump is connected between pipes 64 and 67.