Company Filing History:
Years Active: 1982-1987
Title: Innovations by Bernhard J Polzer
Introduction
Bernhard J Polzer is a notable inventor based in Riesburg, Germany. He has made significant contributions to the field of fastening technology, holding a total of 3 patents. His work focuses on improving the efficiency and effectiveness of fastening tools.
Latest Patents
One of his latest patents is a method of tightening threaded fasteners. This invention is directed to a method for tightening threaded fasteners by means of a controlled fastener-driving tool. The tightening of the fasteners is controlled by the elastic limit thereof. The slope of the actual load-strain characteristic curve is continuously determined during the fastener-driving operation. This actual slope is compared with a predetermined slope determined with reference to a characteristic curve. When the predetermined slope is reached, a control signal is generated to switch off the fastener-driving tool. In practice, departures occur in the actual characteristic curve of an actual fastener-driving operation. To compensate for such departures from the characteristic reference characteristic curve, a comparison is made in the straight portion of the actual load-strain characteristic curve with the predetermined characteristic slope of the reference characteristic curve. A corrective value for transformation of one characteristic curve to the other is formed in the presence of a departure of the slopes. Before the actual determined slope is compared with the predetermined switch-off slope, one of the two quantities is transformed by means of a corrective value.
Another significant patent is for a power tool, specifically a hand-held compressed air screwdriver. This pneumatic screwdriver or nutsetter includes a manually actuated electrical switch and a solenoid-operated motive air shutoff valve. The valve includes a spring-biased reset element for moving the shutoff valve closure element from a closed position to an open position prior to the introduction of compressed air to the tool motor. The reset element is retracted away from the closure element by pressurized air upon startup of a tool operating cycle. The closure element is released upon deenergization of the solenoid at a predetermined signal to close the shutoff valve. In an alternate embodiment, the switch is replaced by a pneumatic valve, and the reset element is pressure air biased to move the shutoff element from the shutoff valve closed position to the open position.
Career Highlights
Bernhard J Polzer is associated with Deutsche Gardner-Denver GmbH, where he continues to innovate in the field of fastening technology. His work has