Patent ID: 6715380
Filing Date: 2004-04-06
Classification: B25B

Abstract:
A power screwdriver comprising:a housing having a main housing; a drive received within said main housing, said drive having a first direction of rotation for tightening a screw and a second direction of rotation for loosening a screw; an angle head; a tool spindle received within said angle head and having a tool receptacle for driving a tool; a drive shaft for driving said tool spindle, said drive shaft being arranged at an angle to said tool spindle; an angle head housing enclosing said angle head; a torque limiting coupling having a predetermined release torque and having first and second coupling parts; a spring for axially biasing said first coupling part against said second coupling part; a plurality of roll bodies rolling between said first and second coupling parts and coupling said first and second coupling parts when driving the screwdriver in a first direction of rotation until said predetermined release torque is reached; first catches provided on said first coupling part; second catches provided on said second coupling part, said first and second catches coacting with each other for locking both coupling parts directly when driven in said second direction of rotation; a reduction gear received within said main housing, said reduction gear being configured as a planetary gear having an input end driven by said drive, having an output end driving said drive shaft, and having a hollow wheel within which at least one sun wheel and a plurality of planetary wheels engaging said hollow wheel are received, the latter acting as a reaction part receiving any reaction moment between said input end and said output end; an adjusting device having a first adjusting part connected to said angle head, and having a second adjusting part connected to said main housing, said first and second adjusting parts being arranged rotatably relative to each other, thereby allowing angular adjustment of said angle head housing with respect to said main housing; wherein said first coupling part of said torque limiting coupling is supported by said first adjusting part connected to said angle head housing; and wherein said hollow wheel of said planetary gear is supported by said second coupling part of said torque limiting coupling.