Stanley Bostitch, Inc.

Walter G Lemos

Arthur E Perra

Leo E La Barre

Rudolph J Kellerman

An internal combustion actuated fastener driving device in which a simple container supply of fuel under pressure carried in a handle portion of the portable housing assembly feeds to a supply chamber controlled by an actuating valve operable in response to a manual acuating procedure to be spring moved into an operative position. The movement of the actuating valve into its operative position communicates a previously formed charge of gaseous fuel under pressure in a separate charge chamber with a series of nozzles so as to discharge in jet stream formations which aspirate fresh air through inlets to mix therewith in a mixing chamber for passage into a combustion chamber in open condition controlled by a main valve. The main valve moves under spring bias into a closed position in response to the depletion of gaseous fuel pressure within the charge chamber in timed relation with the crowding of the spent gases from the combustion chamber by the new combustible mixture. Ignition is in response to the closing of the main valve by a piezoelectric unit. The piston is driven by the energy of the combustion of mixture which initially is at generally atmospheric pressure. The return stroke of the piston is effected by a spring system which is active only at the end of the drive stroke and beginning of the return stroke.

Internal combustion actuated portable tool

A portable power actuated fastener driving device having an improved actuating mechanism which includes a spring biased slide member mounted on the trigger member of the device for rectilinear sliding movement thereon between (1) an abutment position with respect to the actuating member and (2) a non-abutment position with respect to the actuating member. A spring biased slide moving member is mounted on the trigger member for movement with respect thereto between first and second positions and has a motion transmitting relationship with a movable member of the work contacting assembly and with the slide member for (1) causing the slide member to be in the non-abutting position thereof when the slide moving member is in the first position thereof so that when the trigger member is manually moved into the operative position thereof without the device being in cooperating relation with a workpiece, the actuating member remains in the inoperative position thereof and (2) enabling the slide member to be biased into the abutting position thereof when the movable member is moved into the operative position thereof so that a manual movement of the trigger member thereafter into the operative position thereof causes the slide member to move the actuating member into the operating position thereof.

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North Smithfield, RI, United States of America

Walter G Lemos