Patent GB-576072-A (GB)
Title: Improvements in or relating to the motor devices of liquid pressure remote control systems
IPC: F15B11/20
Filed: 1944-01-07
Abstract: 576,072. Hydraulic transmission of power. AUTOMOTIVE PRODUCTS CO., Ltd., and CLENCH, E. C. S. Jan. 7, 1944, No. 373. [Class 69 (ii)] In a liquid-pressure remote control system of the kind in which a number of motors operate in sequence and are each provided with a change-over valve which directs pressure fluid either to the related motor or to the next valve in the sequence, each change-over valve is pressed resiliently into the byepassing position. As applied to a retractable soot blower, rotation of the nozzle and its advance and retraction are effected respectively by liquid pressure motors 22, 19 controlled by valves 52, 53. Both valves are pressed to the right by springs to engage a rack plate 111 movable vertically by movement of the motors. In the position shown, Fig. 2, pressure liquid is supplied by a pump 60 through ports 59, 74 and 83 to a, recess 85 in the valve 53, whence it passes to the motor 19 to advance the nozzle. Towards the end of this movement, a liner 39 actuated by the motor raises the rack until the valve 53 is free to move under spring pressure into contact with a step 144a on the plate. This movement of the valve directs liquid supply from motor 19 to motor 22 thereby rotating the nozzle. Each revolution of the nozzle actuates through cam mechanism a pawl 128 thereby raising the rack one step. After a predetermined number of revolutions the plate 111 is raised sufficiently to permit further movement of the valve 53 past the bottom edge of the rack thereby diverting the fluid supply from the motor 22 back to the motor 19 to effect retraction of the nozzle. Completion of this movement raises the rack a further step through the intermediary of the lever 39 and a second pawl 120. At the same time the rack is caused to move to the right by virtue of the engagement of the lower inclined ends of slots 112, 113 with fixed pins 114, 115. This lateral motion of the rack permits the valve 52 to move to the right thereby diverting the pump supply to a pipe 73 leading to the corresponding valve 52 of the next blower to be operated. The mechanism is reset by means of a control valve 62, which may be constructed as described in Specification 576,073, and which directs pressure liquid to chambers 57, 77 thereby moving valves 52, 53 back to the original position. The rack plate is then returned by a spring 148, the pawls being held out of engagement with the rack by a masking plate 139 which is moved laterally to release the pawls by a projection 142 thereon engaging a similar projection 143 on the rack in the re-set position. Manual operation of the rack may be effected by a lever 146. As applied to a non-retractable blower, the valve 53, motor 19 and lever 39 are omitted. Alternatively, the integrating mechanism shown in Fig. 10 is employed. Valve 52 controls liquid supply either to rotary motor 22 or to the next blower and is pressed by a spring 54b into engagement with a latch 159. Rotation of the blower oscillates an arm 130b, carrying pawl 128b, once for each revolution, thereby raising the latch one step until, after a predetermined number of revolutions, the valve moves into the step 168 of the latch and diverts liquid supply to the next blower. The valve is reset by liquid pressure applied to the end chamber 57b which moves the valve to the right until the latch can return to locking position under spring pressure. Specification 576,076, [Group XXXIII], also is referred to.