| 摘要 |
A mechanism for an air gun uses carbon fibre reinforced composite material in the form of two arms stressed from a planar form to the bowed state, in which state considerable potential energy is stored, and held in this state by a sear (not shown) engaging piston a piston secured to the arms. In the embodiment of Fig. 8, a piston 2 is coupled to the ends of arms 6a, 6b through toggle linkages 5a, 5b through which arms energy is transmitted to the piston on release of the stressed arms to force same along the cylinder 1 communicating by orifice 3 with the gun barrel. The arms are stressed by first drawing back connection blocks 20 along guide 22 with attendant movement back of the arms and piston and thereafter forcing blocks 20, 22 forward whilst holding the piston to bow and stress the arms. The arms preferably are shaped in profile and section to impart a required force/distance characteristic to the piston. In an embodiment of Figure 5, arms 6a and 6b are coupled at their rear ends to blocks 7a, 7b pivoted at 8a, 8b. In operation a block 9, pivoted to the block 7a, 7b through links 10a, 10b, is moved rearwardly to allow the arms 6a and 6b to diverge. At this point the piston is restrained and the block moved forward to stress the arms to the bent position shown and secured against movement. Release of the piston causes it to move forward through the cylinder 1 under the force of the bent arms. <IMAGE>
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