Patent GB-190222905-A (GB)
Title: Improvements in Fluid Pressure Brakes for Ordnance.
Inventor: REICHWALD AUGUST
Filed: 1902-10-21
Granted: 1903-06-18
Abstract: 22,905. Reichwald, A., [Krupp, F.]. Oct. 21. Mountings. -Relates to means for varying, during the recoil and return strokes, the size of the passage communicating between the two sides of the piston in those forms of ordnance recoil apparatus in which liquid flows from one side of the piston to the other through apertures in the piston or grooves in the piston or cylinder. Fig. 1 shows one form of recoil apparatus. Rotation of the piston B is prevented by a rib on the piston engaging in a straight groove in the cylinder. A rotary piece C is fitted between the rear of the piston and a carrier D rigidly secured to a rotary socket J fitted in the body of the piston. The piston B and the rotary piece C are each provided with two diametricallyopposite grooves E, H. Two flap valves d, connected to the carrier D, are normally pressed by a spring K against a conical seating on the rotary piece C, and are provided with stops M to regulate the amount of opening. When the gun is in the firing position, the flaps d nearly cover the ends of the groove H, and the grooves H, E are in line. A projection on the piece C engages in a curved grooved in the cylinder, so that, during recoil, the piece C is turned relatively to the piston, and the passages between the two pairs H, E of grooves are gradually constructed. The flap valves are held in the open position during recoil by the rush of liquid, and are turned during the first portion of the recoil by means of a projection on the carrier D engaging in another groove in the cylinder. The movement of the piece C during the first portion of the return stroke gradually enlarges the passages for the liquid, but, during the remaining portion of the stroke, the flap valves d are gradually moved over the ends of the grooves H back to their initial positions, thereby gradually retarding the passage of liquid. Instead of the grooves T, E, diametrically-opposite sector-shaped openings may be formed in the body of the piston and the piece C. In the form of apparatus shown in Fig. 10, liquid passes from one side of the piston B to the other side through diametrically-opposite grooves P in the cylinder, the breadth of the grooves gradually diminishing in the direction of recoil. The piston B is guided by a projection engaging in a straight groove in the cylinder, and is provided with ribs engaging in the grooves P and bearing against the straight side p<2> thereof. The flap valves d are mounted on the piston B, as before described, and the ends of the valves d engage in the grooves P. The flap valves are turned relatively to the piston, during recoil and return, by a lateral extension of the piston engaging in a curved groove in the cylinder. During the first part of the return stroke, liquid can flow from one side of the piston to the other through a graduallydiminishing space between the edges of the flap valves and the curved edges of the grooves P. The further movement of the valves d during the remainder of the stroke allows liquid to pass through a gradually-increasing space between the edges of the valves and the ribs on the piston.