The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 1985
Filed:
Dec. 21, 1982
Peter Jochum, Meiningen, AT;
Hilti Aktiengesellschaft, Schaan Furstentum, LI;
Abstract
A setting device includes a driving piston propelled by high pressure gases through a casing for driving fastening elements into a receiving material. A stop device located within the casing secures a stop element in a recess in the driving piston for holding the piston in the firing position. The stop device includes a first spring and a second spring each biasing the stop element into the recess. The first spring has a greater biasing force than the second spring. To release the driving piston from the firing position so that it can drive a fastening element into a receiving material, the propelling forces acting on the piston displace the stop element against the force of the springs and then the first spring biases the stop element against the second spring. After the stop element is displaced out of the recess only the second spring acts on the stop element so that movement of the driving piston relative to the stop element is effective without any appreciable holding action limiting such movement.