SELF-CONTROLLED PORTABLE TOOL Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: tool has housing 2, lengthened cylinder 6 arranged inside the housing, and piston 11 provided with top side 49 and bottom side 47, combustion chamber 29 made in housing, means for obtaining an air- fuel mixture in combustion chamber 29, and means 30 for ignition mixture in the combustion chamber. Piston 11 is mounted inside cylinder 6 for movement between the top rest position and bottom position and defines an engine member. The combustion chamber serves for driving piston 11 from the top position to the bottom position to actuate the working member. The top side 49 of piston 11 defines the wall of combustion chamber 29. The means for moving piston 11 upward through back throw from the bottom position to the top rest position has openings 9 made in lengthened cylinder 6 between its faces for connection of cylinder 6 with the atmosphere and underlies the top rest position and is above the bottom position of piston 11. As a result, when piston 11 is in the bottom position, it can move behind openings 9 for connection of the combustion chamber with openings 9 and for discharging from the combustion chamber. In addition, tool has a means positioned at the bottom face of cylinder 6 and used as a buffer which provides initial movement of piston 11 upward from the bottom position. Piston 11 is positioned at the top rest position for the next upward throw under the action of atmospheric pressure which effects on bottom side 47 of the piston and heat vacuum created in the combustion chamber. EFFECT: improved design. 11 dwg