Power wrench with reaction bar controlling means

A power wrench comprising:

• a housing with a first part containing a rotation motor and a handle for manual support of the wrench, a second part containing a reduction gearing, and an output shaft,
• a swivel connection between said first part and said second part, and
• a laterally extending reaction bar rigidly secured to said second part and intended to take support against a stationary object (A),
• wherein an angle sensing means is provided at said swivel connection and arranged to deliver signals in response to angular movements between the first part and the second part, and a power control unit is connected to the motor and to said angle sensing means, and
• wherein said power control unit is arranged to at least substantially reduce the power supply to the motor as a preset maximum angular movement (α) between the first and second housing parts is exceeded as the motor is started.