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Velocette Spring-heeled Jack
The Velocette Spring Heeled Jack is a motorcycle built by Velocette at Hall Green, Birmingham, England. This famous works KSS 350cc, sprung frame, Velocette was a prototype and as such the only one ever built by the Hall Green factory. The bike was christened Spring-heeled Jack by Harold Willis, and has been known by that name ever since by enthusiasts all over the world. First registered in May 1927, the motorcycle was a one-off built for Alec Bennett, the factory's number one rider, and was unsuccessfully tried in the practice sessions of the 1928 Isle of Man TT. This bike retained the factories hand change mechanism although the positive stop foot change was to be seen on the other race bikes of that year, and also had a straight through exhaust pipe.
==Sprung frame==
The bike had a prototype sprung frame built under the Bentley and Draper patents. The frame as far back as the gearbox bracket was normal K. Behind this however is a triangulated tubular swinging fork assembly worked in a trunnion bearing. From the rear fork-ends two seta-stays were pivoted and connected to the sprung part of the frame below the saddle by a system of links and spindles incorporating two coil springs. Friction dampers were fitted to these links and there were also two more at the bottom pivots at the fork-ends.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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