Patent ID: 8561869
Filing Date: 2013-10-22
Classification: B25C

Abstract:
1. A compressed air driven setting tool for driving in fastening elements, comprising a guide ( 12 ); a drive-in piston ( 13 ) displaceable in the guide by a compressed air; a chamber ( 17 ) adjoining the guide ( 12 ) and having an opening ( 18 ) connecting the chamber ( 17 ) with the guide ( 12 ) and closed by the piston ( 13 ) in an initial position of the setting tool, the chamber ( 17 ) serving as a storage chamber for the compressed air in the initial position of the setting tool for storing the compressed air and serving as an expansion chamber in an operational positions of the setting tool and the piston ( 13 ); a compression device ( 30 ) for producing the compressed air and for feeding the compressed air into the chamber ( 17 ) in the initial position of the setting tool; at least one check valve ( 44 , 54 , 142 ) arranged between the compression device ( 30 ) and the chamber ( 17 ) for enabling flow of the compressed air from the compression device ( 30 ) into the chamber ( 17 ); and a piston retaining device ( 47 ) for retaining the drive-in piston ( 13 ) in the initial position ( 80 ) thereof against the pressure of the compressed air in the chamber ( 17 ).