초록 ▼

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 t

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.

대표청구항 ▼

A percussion apparatus comprising a first housing, a main operating piston displaceable in said first housing from a rest position to a driven position and connected to a driver member; a second housing, an auxiliary piston displaceable in said second housing between a top and bottom end of stroke p

A percussion apparatus comprising a first housing, a main operating piston displaceable in said first housing from a rest position to a driven position and connected to a driver member; a second housing, an auxiliary piston displaceable in said second housing between a top and bottom end of stroke positions, retaining means for retaining said auxiliary piston in its top end of stroke position and actuating means for releasing said retaining means to initiate an operating cycle of said apparatus, means on said auxiliary piston for engaging said main operating piston to displace said main operating piston from its rest position to an intermediate position, a cylinder head disposed between said first and second housings and having an opening therethrough receiving said auxiliary piston and being closed thereby, air inlet means into said first housing for admitting combustion supporting air, said auxiliary piston defining a predetermined storage capacity for fuel and having means to transfer the fuel together with combustion supporting air to a space between said main operating piston in its intermediate position and said cylinder head in the course of its displacement between its top and bottom positions, the volume of said space being dependent upon the length of stroke of said auxiliary piston, ignition means for igniting the explosive mixture composed of the fuel and the combustion supporting air in said space when said auxiliary piston is in its bottom end of stroke position to thrust said main operating piston to its driven position and concomitantly return said auxiliary piston to its top end of stroke position, and exhaust means for evacuating exhaust gases produced by combustion of the explosive mixture.