Spark unit for combustion-powered driving tool

F - Mech Eng,Light,Heat,Weapons – 02 – P

Patent

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Details

F02P 15/00 (2006.01) B25C 1/08 (2006.01) H01T 13/20 (2006.01)

Patent

CA 2393493

A spark unit for an internal combustion fastener-driving tool comprises a spark plug body mounted within a boss portion of the tool cylinder head, and a spark unit cathode electrode is mounted within the spark plug body in such a manner that the tip portion of the spark unit cathode electrode projects below or away from the bottom or under-surface portion of the cylinder head mounting boas. In this manner, the tip portion of the spark unit cathode electrode is not disposed within a recess or pocket region so as not to tend to accumulate dirt or oil deposits which can tend to foul or otherwise adversely affect the sparking and ignition characteristics of the spark plug assembly and the operation of the fastener-driving tool.

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