| 摘要 |
A percussion apparatus, for example for driving nails or staples, having an auxiliary piston which when released thrusts a main operating piston to an intermediate position. The auxiliary piston transfers a metered quantity of gaseous fuel together with combustion supporting air to a space between the main piston and cylinder head separating the auxiliary piston cylinder from the main piston cylinder. The explosive mixture in the space is then ignited and the main piston is thrust in a first direction displacing a driver member and simultaneously the auxiliary piston is thrust in the opposite direction to its initial position where it is retained until released to start another operating cycle; the main piston automatically returns to its initial position as the combustion gases are exhausted to the atmosphere.
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