초록 ▼

The gas admitted into the combustion chamber (10) is compressed by relative sliding of the cylinder (3) and the sleeve (4). Ignition is effected by a spark plug (13). During compression, the piston (35) is fixed in position by a retaining ring (32). The cylinder (3)/sleeve (4) assembly is connected

The gas admitted into the combustion chamber (10) is compressed by relative sliding of the cylinder (3) and the sleeve (4). Ignition is effected by a spark plug (13). During compression, the piston (35) is fixed in position by a retaining ring (32). The cylinder (3)/sleeve (4) assembly is connected to the housing (1) of the apparatus by return springs. The apparatus is very suitable for fastening straps to steel or concrete.

대표청구항 ▼

Apparatus for securing an element within a substrate, comprising: a housing having a longitudinal axis; a sleeve member disposed within said housing; a combustion chamber defined within said sleeve member; a cylinder disposed within said sleeve member; a guide member, for gliding an element as said

Apparatus for securing an element within a substrate, comprising: a housing having a longitudinal axis; a sleeve member disposed within said housing; a combustion chamber defined within said sleeve member; a cylinder disposed within said sleeve member; a guide member, for gliding an element as said element is being driven by said apparatus into a substrate, fixedly attached at one end thereof to said cylinder and having a second end thereof for engaging a substrate; and a piston axially movable within said cylinder for movement between a first ready position at which said piston is disposed so as to subsequently drive an element, disposed within said guide member, into a substrate, and a second fired position at which said piston drives an element, disposed within said guide member, through said guide member and into a substrate; said cylinder being axially movable within said sleeve member, as a result of said guide member engaging said substrate, between a first position at which said cylinder cooperates with said sleeve member so as to sealingly close one end of said combustion chamber, and a second position at which said cylinder continues to cooperate with said sleeve member so as to maintain said one end of said combustion chamber sealed closed and reduces the volume of said combustion chamber prior to ignition of a combustible charge within said combustion chamber so as to increase the combustion power developed within said combustion chamber and imparted to said piston, and an element driven thereby, when a combustible charge is ignited within said combustion chamber.