Patent ID: 9114516
Filing Date: 2015-08-25
Classification: B25C

Abstract:
1. A combustion-powered fastener-driving tool, comprising: a combustion-powered power source including a combustion chamber defined by a cylinder head, a valve sleeve, a cylinder and an upper surface of a reciprocating piston; said valve sleeve reciprocable relative to said cylinder head between a rest position where said combustion chamber is unsealed and a pre-firing position where said combustion chamber is sealed; a reciprocal work contacting element connected to said valve sleeve by a combustion chamber support bracket, said reciprocal work contacting element being movable toward said cylinder head to an elevated position when pressed against a workpiece thereby moving said valve sleeve and said combustion chamber support bracket toward said cylinder head to said pre-firing position; a trigger arranged on a handle for operating an electrical switch when depressed to generate a spark in said combustion chamber; a lockout device mounted to the tool and having an actuated position configured for preventing movement of said valve sleeve away from said cylinder head while said trigger is depressed; and said lockout device including a protrudable element movable by means of depression of said trigger and a recess in the form of an opening extending through said combustion chamber support bracket engageable by said protudable element when said trigger is depressed and said work contacting element is pressed against said workpiece, to prevent movement of said combustion chamber support bracket so long as said trigger remains depressed, said protrudable element comprising a pin having a first cylindrical portion with a cylindrical first free end facing towards the valve sleeve and carried in a slide track to reciprocate towards and away from said combustion chamber support bracket and a second portion extending perpendicular from the first portion and being captured in a cam slot on the trigger such that movement of the trigger causes the second portion to move from one portion of the cam slot to a different portion of the cam slot which reciprocally slides the first cylindrical portion of the pin in the slide track, the cylindrical free end of the pin, upon movement of the trigger, when the combustion chamber support bracket is moved to the elevated position, being moved into insertion in the opening through the combustion chamber support bracket, the free end of the pin remaining engaged with the opening through the combustion chamber support bracket so long as the trigger remains depressed.