| 摘要 |
1,197,687. Clay pigeon trap or launching device. P. CULAS. 17 Sept., 1968 [19 Sept., 1967], No. 44051/68. Heading A6D. A device for projecting into the air clay pigeons and other target projectiles comprises a curved tubular member into which the projectile to be launched is placed, said tubular member being closed at one end and open at the other and having means for admitting a compressed gas into the closed end, said tubular member being provided with a sunway of frictional material extending at least part way along its internal wall having the greatest radius of curvature and wherein the cross-section of the tubular member is such that the projectile is a sufficiently close sliding fit to prevent undue escape of the compressed gas, the coefficient of friction of the frictional material being such that a rotary motion is imparted to the projectile as it is launched. As shown in Fig. 1, the device comprises a rigid curved tubular member 1, its curvature being preferably elliptical, and the portion 2 of the member at its open end being straight. As shown in transverse section in Fig. 2, one wall 3 of the member is smooth and flat while the opposing wall 4 is internally profiled to fit the shape of the stepped face of the clay pigeon or projectile 5 which is a circular disc one face of which is flat and the other stepped. There is a small clearance between the stepped face of the projectile 5 and the wall 4 of the tubular member. The wall of the tubular member I having the larger radius of curvature is provided along its length with a strip 6 of frictional material which cooperates with a running edge of the projectile 5 during the launch of the projectile and cause it to rotate as it is launched. The closed end 8 of the member 1 is provided with an inlet valve 9 through which a compressed air or other gas can be admitted into the member 1. The valve 9 is adapted to open and close automatically. When the projectile 5 is inserted up to the end of the tubular member I as shown in Fig. I and the valve 9 is opened the projectile is forced to the open end of the tubular member at high speed, and at the same time rolls along the runway 6 so that it is also caused to rotate at a high speed. As a result of the gyroscopic effect thereby produced the path of travel of the projectile through the air is stable over the whole of its trajectory. |
