1
Konrad K Kettner: Reversible twin-chambered compressed-air motor. Cooper, Alan R Thiele, Eddie E Scott, April 18, 1989: US04822264 (20 worldwide citation)

In reversible compressed air rotary motors for compressed air tools, particularly for wrenches, it is known to discharge the waste air radially from the casing of the motor, which results in a considerable nuisance, in particular as regards noise. Furthermore, due to the close positioning of the com ...


2
Konrad K Kettner, Heinz Gerhard Anders, Eugen Mattheiss: Hydro-impulse screwing device. Cooper, Alan R Thiele, David A Rose, June 8, 1993: US05217079 (16 worldwide citation)

A hydro-impulse screwing device comprises a rotary drive motor, a power source for the motor, a drive shaft, a pulsating hydraulic drive connecting the motor to the shaft and a power cut-off for the motor. The load at which the power cut-off functions is adjustable. The tool has a borehole extending ...


3
Konrad K Kettner: Hydraulic impulse screwdriver particularly for tightening screw connections. Cooper, Burns Doane Swecker & Mathis, October 22, 1996: US05567886 (12 worldwide citation)

A hydraulic impulse screwdriver includes a control circuit, a drive shaft, a compressed-air motor having a motor shaft, a compressed air inlet, and an outlet, a striker having a pressurizing cylinder chamber, the striker connected to the outlet of the compressed-air motor for impulse-like driving of ...


4
Heinz G Anders, Konrad K Kettner: Compressed-air screw or bolt tightener, especially an impulse or a torque screw or bolt tightener. Cooper, William B Patterson, Eddie E Scott, August 8, 1995: US05439063 (12 worldwide citation)

A compressed-air screw or bolt tightener having a driving motor which drives a driving shaft for a screwing or tightening tool is disclosed. The motor is operated by compressed air and a control valve for switching the compressed-air supply to the screw or bolt tightener on or off. A pressure-regula ...


5
Konrad K Kettner, Heinz Gerhard Anders: Hydro-impulse screw tool. Cooper, Alan R Thiele, Eddie Scott, Bruce Patterson, December 22, 1992: US05172772 (7 worldwide citation)

This invention relates to a rotary impulse screwing device which generates only one pulse per rotation of the output shaft. Two main and two additional lamellas are adjustably positioned in the output shaft. The two main lamellas seal at a minimum of two times per rotation of the output shaft. The t ...