Operator carried power tool having a four-cycle engine

Details Operator carried power tool having a four-cycle engine Operator carried power tool having a four-cycle engine

F - Mech Eng,Light,Heat,Weapons

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F01M 1/06 (2006.01) B26B 7/00 (2006.01) F01M 1/00 (2006.01) F01M 1/04 (2006.01) F01M 9/06 (2006.01) F01M 9/10 (2006.01) F01M 11/06 (2006.01) F02B 63/02 (2006.01) F02B 75/02 (2006.01) F01M 13/04 (2006.01)

Patent

CA 2124824

A handheld powered tool (20) is provided which is intended to be carried by an operator during use. The power tool (20) has a frame (22), including a handle (24, 26) to be grasped by the operator, an implement (32) affixed to the frame (22) having a rotary input mem- ber (64) and a small four-cycle aluminum internal combustion engine (30) attached to the frame for driving the implement. A crankshaft (36) is journaled to the engine block for rotation about a crankshaft axis. A piston (38) reciprocates within the bore (34) and is connected to the crankshaft by a connecting rod (40) having oil splashes (60) formed thereon for intermittently engaging the oil within the enclosed oil reservoir (58) to splash lubricate the engine. The engine (30) is pro- vided with a cylinder head (42) assembly defining a compact combus- tion chamber (44) having a pair of overhead intake exhaust ports (46, 52) cooperating intake and exhaust valves (50, 56). A lightweight high powered engine (30) is thereby provided having relatively low HC and CO emissiions.

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