Patent ID: 8215224
Filing Date: 2012-07-10
Classification: F41A

Abstract:
1. A recoil brake, comprising: a cylinder; a piston disposed in the cylinder for reciprocation therein; a piston rod attached to the piston, the piston rod and piston having a central opening therethrough; a single control rod which provides both long and short recoil braking, which control rod is disposed in the central opening in the piston rod and piston, the control rod having a diameter that varies along its length substantially in accordance with the following number pairs, wherein a first number in each pair is an axial location along the control rod and a second number in each pair is a diameter of the control rod at that axial location: (0.00, 0.6250); (0.50, 0.6250); (1.00, 0.6250); (1.50, 0.6250); (2.00, 0.7641); (2.50, 0.9093); (2.75, 0.9150); (3.00, 0.9195); (3.50, 0.9250); (4.00, 0.9270); (4.50, 0.9285); (5.00, 0.9310); (5.50, 0.9335); (6.00, 0.9365); (6.50, 0.9395); (7.00, 0.9425); (7.50, 0.9460); (8.00, 0.9500); (8.50, 0.9540); (9.00, 0.9575); (10.00, 0.9660); (11.00, 0.9750); (12.00, 0.9850); (13.00, 0.9975); (14.00, 1.0150); (15.00, 1.0300); (15.50, 1.0350); (16.00, 1.0420); (16.50, 1.0475); (17.00, 1.0530); (17.50, 1.0560); (18.00, 1.0610); (18.50, 1.0670); (19.00, 1.0750); (19.50, 1.0830); (20.00, 1.0926); (20.50, 1.0999); (21.00, 1.1073); (21.50, 1.1170); (22.00, 1.1300); an end cap rotatably disposed in one end of the cylinder, one end of the control rod being fixed to the end cap and the other end of the control rod being free; at least one fluid passage from the piston to the control rod; a long stroke body fixed to the piston, the long stroke body defining a long stroke orifice around the control rod, a diameter of the long stroke orifice being about 1.14 inches; and a short stroke body removably disposed in the long stroke orifice, the short stroke body defining a short stroke orifice around the control rod, a diameter of the short stroke orifice being about 1.05 inches; wherein fluid flow through the at least one fluid passage may be selectively directed through one of the long stroke orifice and the short stroke orifice by rotation of the end cap.