Operator carried power tool having a four-cycle engine
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United States of America Patent
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Sep 7, 1993
Grant Date -
N/A
app pub date -
Dec 2, 1991
filing date -
Dec 2, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hand held powered tool is provided which is intended to be carried by an operator during use. The power tool has a frame, including a handle to be grasped by the operator, an implement affixed to the frame having a rotary input member and a small four-cycle lightweight internal combustion engine attached to the frame for driving the implement. The four-cycle engine is made up of a lightweight aluminum engine block having a cylindrical bore and an enclosed oil reservoir formed therein. A crankshaft is journaled to the engine block for rotation about a crankshaft axis. A piston reciprocates within the bore and is connected to the crankshaft by a connecting rod having oil splasher formed thereon for intermittently engaging the oil within the enclosed oil reservoir to splash lubricate the engine. The engine is provided with a cylinder head assembly defining a compact combustion chamber having a pair of overhead intake exhaust ports cooperating intake and exhaust valves. A lightweight high powered engine is thereby provided having relatively low HC and CO emissions.
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