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:
Jan. 18, 1983
Filed:
Apr. 15, 1981
Steffen Wunsch, Dettenhausen, DE;
Heinz Walz, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A power screwdriver has a drive motor and a tool holder arranged in a housing, a driving coupling including a driving coupling part driven by the motor and a driven coupling part, and a locking coupling arranged between the driving coupling and the tool holder, wherein the couplings are arranged so that when the tool holder is pressed against a screw the coupling parts of the driving coupling are connected with one another and torque from the motor is transmitted to the tool holder in a normal manner, when thereafter a limit torque is attained the locking coupling is overrun, the driving coupling part of the driving coupling is arrested, and the driven coupling part of the driving coupling is disconnected from the driving coupling part, and when the tool holder is pressed stronger against the screw which is difficult to screw in the driven coupling part displaces and follows the driving coupling part and is again connected with the latter so as to again provide for transmission of the torque from the motor to the tool holder.