초록 ▼

A production assembly tool for securing fasteners to a workpiece such as an automobile body. The production assembly tool of the present invention includes a housing which encases a motor, a transmission, a clutch mechanism and a control module. The control module controls the running and braking of

A production assembly tool for securing fasteners to a workpiece such as an automobile body. The production assembly tool of the present invention includes a housing which encases a motor, a transmission, a clutch mechanism and a control module. The control module controls the running and braking of the motor and prevents both over and under securing of a fastener caused by falsely detected tool clutch conditions. An improved clutch sensor switch is operatively associated with the control module for detecting clutch disengagement. The clutch mechanism is designed to drive the fastener until the clutch sensor switch detects clutch disengagement and signals the control circuit to stop drive and start braking. The production assembly tool further includes a system for ensuring accurate placement of the power tool motor in the power tool housing subsequent to motor servicing or repair. Further, an adjustment collar located in the tool nose allows selective access to a clutch adjustment mechanism of the tool located within the housing for torque level adjustment. In addition, the tool housing is covered by an integral, self-sealing non-marring overmold exterior. The overmold exterior allows a lubrication needle to be inserted through an aperture located beneath the overmold exterior. After the needle is removed, the overmold exterior subsequently self-seals, thereby preventing dirt from entering the interior of the tool housing and the applied lubrication from leaking.

대표청구항 ▼

[ What is claimed is:] [9.] An electrically powered tool for driving a fastener to a predetermined torque level including a housing, a motor disposed within the housing for rotatably driving an output spindle journalled with respect to the housing and adapted for drivingly engaging the fastener, a c

[ What is claimed is:] [9.] An electrically powered tool for driving a fastener to a predetermined torque level including a housing, a motor disposed within the housing for rotatably driving an output spindle journalled with respect to the housing and adapted for drivingly engaging the fastener, a clutch disposed between the motor and the output spindle and movable in response to the torque applied to the output spindle attaining said predetermined torque level from an engaged position wherein torque from the motor is applied to the output spindle to a disengaged position wherein torque from the motor is not substantially applied to the output spindle, and a clutch switch operatively associated with the clutch and responsive to movement of the clutch for switching from a first state when the clutch is in the engaged position to a second state when the clutch is in the disengaged position;the improvement comprising control circuit means for controlling the energization of the motor in response to the position of said clutch switch, said control circuit means energizing said motor when said clutch switch is in said first state, detecting that said clutch switch has remained in said first state for a predetermined period of time, and de-energizing said motor when the clutch switch switches to said second state.