Patent GB-190212314-A (GB)
Title: A New or Improved Method and Apparatus for Controlling Hydraulic Presses, Shears, Stamps and the like
Inventor: ASTFALCK WILAND
Filed: 1902-05-29
Granted: 1902-07-31
Abstract: 12,314. Astfalck, W. May 29. Shearing; stamping.-Relates to a method of and apparatus for controlling hydraulic presses, shears, stamps, &c., whereby the filling of the cylinder with low-pressure water, the introduction of high-pressure water, and the exhaust of the cylinder are carried out in a predetermined order. One arrangement of the apparatus is shown diagrammatically in Fig. 1. The pressure cylinder 4, in which slides the piston 5, is connected to the low and high pressure water supply and exhaust pipes 6, 36, 20. The pivoted controlling-lever 11, which may be operated by hand or by hydraulic means, is connected by a link to a lever 18 coupled to a cut-off device 19 sliding in a casing d. This casing is connected to the pipe 20, a high-pressure water-pipe 15, and the exhaust pipe 10. The lever 11 also controls valves 16, 17 in chambers e, f, which are placed in communication with each other and with a pipe 24 by means of a passage 23. The chamber e is also connected to pipes 14, 15, and the chamber f communicates with the exhaust pipe 10. The pipes 13, 14, 15 are in communication with the high-pressure water-supply pipe 12, and are kept full of water. The controlling- mechanism for the high-pressure pipe comprises a valve 34 arranged in a casing g, which communicates with the pipes 12,13, 14, 36. The valve 34 is connected by a rod i to a piston 33 arranged in a cylinder h, to which are connected the pipes 13, 32. A pivoted lever 35 is coupled to the rod' i and serves to control a valve 27 in a casing, to which pipes 26, 28 are coupled. The controlling- mechanism for the low-pressure pipe 6 consistsof a valve 7, which is connected by a rod n to a piston 29 working in a cylinder r, connected to. the pipes 14, 28. A lever 30 coupled to the rod n, or an arm attached to the rod, serves to operate a valve 31 arranged in a casing s in communication with the pipes 25, 34. The pipe 25 communicates with the pipes 24, 26. When the piston 5 is to be moved downwards, the lever 11 is moved. to the position II, thereby allowing water to pass from below-the piston and through the pipe 20, past the valve 19, to the exhaust pipe 10 ; at the same time the space above the piston is filled with lowpressure water, the valve 7 being open. If the lever 11 is then moved to the position III, the pipe 20 is still open to the exhaust, the valve 16 is opened and the valve 17 closed. Water now passes from the pipe 14, by the channel 23, pipes 24, 26, valve 27, and pipe 28, to the cylinder r and raises the valve 7 to shut off the low-pressure supply. At the same time the valve 31 is opened and high-pressure water passes, by way of the pipes 25,32, to the cylinder h, to raise the piston 33 and open the valve 34 to admit high-pressure water to the pipe 36 leading to the space above the piston 5. The operation of the valve 34 causes the lever 35 to move, so as to allow the valve 27 to close. Upon moving the lever 11 back to the position I, the pipe 20 is shut off from the exhaust, the valve 16 is closed, and the valve 17 is opened. The valve 31 being still open, the pipes 32, 24, 25 are relieved of pressure. The piston 22 is forced downwards closing the valve 34, and at the same time opening the valve 27 thereby allowing the piston 29 to be forced downwards to open the valve 7. Upon moving the lever 11 to the position IV, the pipe 15 is placed in communication with the pipe 20, and high-pressure water passes into the space below the piston 5 to raise the same, the water in the space above the piston being forced back into the supply pipe 6. When the piston is raised, the lever 11 is moved back to the position I, so as to break the connection between the pipes 15, 20, and the operation can be repeated. In a modification, two of the chambers are dispensed with and the pistons 29, 33 are replaced by piston valves or slides, which control the valves 7, 34, and also the pipes 25, 32, 13. This modification is also shown as described in a practical form, in which some of the conical valves are replaced by slide valves, and the parts are more conveniently arranged, the valve 7 being connected to the controlling-slide by a rocking lever and links. In another modification, the valves 27, 31 are dispensed with, and a mechanical connection is arranged between the valves 7, 34. The end of the lever 35 is connected, through a link, to one arm of a bell-crank lever, the other arm of which is hook-shaped and adapted to engage beneath or bear against a projection on the rod n, to control the action of the valves.