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tappet
A tappet is a projection that imparts a linear motion to some other component within a mechanism.
== Beam engines ==
The term is first recorded as part of the valve gear of Thomas Newcomen's atmospheric beam engine, a precursor to the steam engine. The first Newcomen engines had manually worked valves, but within a few years, by 1715, this repetitive task had been automated. The beam of the engine had a vertical 'plug rod' hung from it, alongside the cylinder. Adjustable blocks or 'tappets' were attached to this rod and as the beam moved up and down, the tappets pressed against long levers or 'horns' attached to the engine's valves, working the cycle of steam and injection water valves to operate the engine. This operation by tappets on a plug rod continued into the early twentieth century with the Cornish engine.
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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