1
John Francis Zettler: Brake monitor with self-checking. Xenex Corporation, Reising Ethington Barnard, September 20, 1977: US04048886 (96 worldwide citation)

A monitoring system is disclosed for measuring and classifying the decelerating capabilities of a machine, such as a punch press. The monitoring system includes a timing circuit for measuring the elapsed time from the initiation of brake application to the stopping of the press. Means are provided t ...


2
George L Schofield Jr, James L Lignell: Presence detecting system with self-checking. Xenex Corporation, Reising Ethington Barnard Perry & Brooks, July 20, 1976: US03970846 (85 worldwide citation)

This invention relates to presence sensing systems and more particularly to such systems which utilize beams of radiant energy, such as light beams, to detect the presence of a person or an object within a predetermined space. Additionally the invention relates to presence detecting systems combined ...


3
Dow Frederick J T, Hartung Dudley B: Presence sensing and self-checking control system. Xenex Corporation, Reising Ethington & Perry, May 27, 1975: US3886413 (80 worldwide citation)

A presence sensing system provided with self-checking operation is disclosed. The system is especially adapted for use in a control system for machines to ensure safe operation thereof. The system comprises a presence sensing section capable of producing output signals indicative of normal, intrusio ...


4
John F Zettler, Harold F Twyman: Intrusion detector for press brake. Xenex Corporation, Reising Ethington Barnard Perry & Brooks, February 3, 1981: US04249074 (42 worldwide citation)

An intrusion detection system is disclosed for safeguarding an operator of an industrial machine such as a press brake. A light screen barrier (420) comprises sequentially pulsed beams (422) which are spaced far enough apart to permit penetration by a work piece (144) without obstructing more than o ...


5
Hartung Dudley B: Adaptive control system. Xenex Corporation, Reising Ethington & Perry, October 7, 1975: US3911347 (24 worldwide citation)

An adaptive system is disclosed for controlling the motion of a member which makes successive excursions of a desired path. Dynamic errors which cause deviation from the path are reduced on successive excursions by developing and storing correction signals corresponding to given intervals during eac ...


6
George L Schofield Jr: Solid state self-checking relay. Xenex Corporation, Reising Ethington Barnard Perry & Brooks, September 21, 1982: US04351014 (13 worldwide citation)

A solid state relay is disclosed which is failsafe in the sense that it is prevented from failing in a closed circuit condition. The relay comprises a main switch adapted to be connected in series with a load and voltage source and responsive to relay opening and closing signals. A secondary switch ...


7
Bertil Werjefelt: Decompression and toxic fume protection apparatus. Xenex Corporation, Xenex Systems Partnership I, Shlesinger & Myers, March 12, 1991: US04998529 (8 worldwide citation)

Decompression and toxic fume protection apparatus comprising an inner chamber adapted to surround the head of the wearer, an inflatable and concentric outer chamber, a gas reservoir, means for removal of carbon dioxide and passageways for the circulation of gas through the apparatus.


8
John F Zettler: Switching circuit for eliminating the effects of contact bounce. Xenex Corporation, Reising Ethington Barnard Perry & Brooks, December 25, 1979: US04180747 (1 worldwide citation)

A switching circuit is disclosed for eliminating the effects of contact bounce in a movable contact switch connected between a voltage source and the input of a switching transistor. When the movable contact switch is closed, bouncing of the contacts undesirably produces a momentary voltage pulse wh ...


9
Zettler John F, Twyman Harold F: Detecteur prevenant le fonctionnement dune presse a plier lorsque les mains du mecanicien y sont engagees, Intrusion detector for press brake. Xenex Corporation, MEREDITH & FINLAYSON, July 20, 1982: CA1128161

INTRUSION DETECTOR FOR PRESS BRAKE ABSTRACT An intrusion detection system is disclosed forsafeguarding an operator of an industrial machine suchas a press brake. A light screen barrier (420) comprisessequentially pulsed beams (422) which are spaced farenough apart to permit penetration by a work pie ...


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