Handheld portable tool having an internal combustion engine

Details Handheld portable tool having an internal combustion engine Handheld portable tool having an internal combustion engine

1986-12-19

1989-06-06

Yost, Frank T.

Tool driving or impacting

Including means to vibrationally isolate a drive means from...

74603, E21B 300

Patent

active

048362972

ABSTRACT:
A handheld portable tool has a drive unit connected to the handle via damping elements. The drive unit includes an internal combustion engine having a crankshaft. To reduce the vibration transmitted by the drive unit to the handles, a static or dynamic imbalance of defined position and quantity is provided on the crankshaft of the engine, as a result of which vibration in the handles is considerably reduced. An imbalancing weight may for instance be provided in the fan wheel, so that the crankshaft and its elements are manufactured and balanced in the same manner as before, and only the fan wheel has to be structurally modified.

REFERENCES:
patent: 3525373 (1970-08-01), Kobayashi
patent: 4632072 (1986-12-01), Brogdon

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