| Patent Number |
Title Of Patent |
Date Issued |
| 4562389 |
Automatic screwdriver or torquing tool control system |
December 31, 1985 |
| To permit reliable turn-OFF of the motor when the torque of the motor is sufficient to provide for reliable seating of a screw or nut being driven thereby, start conditions of the motor are sensed, either in form of low-current condition or high power factor; high-torque conditions are |
| 4502549 |
Spring-coupled power screwdriver |
March 5, 1985 |
| A helical spring couples a drive shaft geared to the motor with the work spindle. With this arrangement hard screwdriving operations can be extended in time so that time is added for the drive motor to come a stop after it is switched off. Transducers are provided for measuring the t |
| 4463293 |
Method and apparatus for shutting off a power screwdriver |
July 31, 1984 |
| A power screwdriver that is equipped with a spring coupling between the motor drive and the tool spindle, a signal that indicates that a certain value of torque has been overstepped, at which the screwdriver must be sopped, first causes reversal of the motor, but before the motor app |
| 4458565 |
Torque limiting power screwdriver |
July 10, 1984 |
| A torque limiting power screwdriver includes a housing in which there is supported for rotation and axial displacement a screwdriver spindle. A transmission transmits power from a motor to the screwdriver spindle. A torque overload coupling and a separating coupling are interposed in the |
| 4368784 |
Power screwdriver |
January 18, 1983 |
| 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 |
| 4274642 |
Tool chuck |
June 23, 1981 |
| In order to improve the holding power of a tool chuck, especially a tool chuck for use with percussion or impact drills, without the use of elastic friction elements that impede intentional opening and closing, the invention describes a tool chuck in which cooperating, preferably conical |
