Patent ID: 6964362

Claim:
A combustion chamber assembly for use in a combustion-powered fastener driving tool, comprising: a cylinder body; a reciprocating probe assembly slidably disposed relative to said cylinder body between a first, extended position and a second, retracted position, said probe assembly configured for contacting a workpiece; and at least one shock-absorbing member operationally associated with at least one of said cylinder body and said probe assembly for reducing shock load generated by said tool during combustion and transmitted between said probe assembly and said cylinder body; said probe assembly includes an upper probe including at least one arm portion configured for sliding relationship relative to said cylinder body and having an upper end, said at least one shock-absorbing member disposed between said upper end and a corresponding element of said cylinder body for transmitting loads from said probe assembly to said cylinder body; wherein said at least one shock-absorbing member is configured for reducing load forces generated in a combustion chamber of said assembly upon said probe assembly reaching said second position, and being configured to have sufficient rigidity to limit the travel of said probe assembly relative to said cylinder body and also sufficient resilience for absorbing shock forces generated by the tool in said second position.