The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 1982
Filed:
May. 07, 1980
Hans Weigert, Ridgewood, NJ (US);
Other;
Abstract
A silicon controlled rectifier trigger circuit is responsive to an input AC voltage and provides at least one drive pulse per switch activation to a load circuit. Such load circuit advantageously includes an electric stapler or an electric brad driver. Such trigger circuit generally comprises: a two-position switch; first and second capacitors; first and second Zener diodes; a transistor; and a silicon controlled rectifier. The drive pulse is provided to the load circuit when the switch is in its second position; the first capacitor is charged by the input AC voltage when the switch is in its first position; the first Zener diode and the transistor are conductive when the input AC voltage is greater than a first predetermined value; the first and second Zener diodes are conductive and the transistor is non-conductive when the input AC voltage is greater than a second predetermined value; the second capacitor is interposed between the first Zener diode and the transistor; the silicon controlled rectifier is conductive when the transistor is conductive and when the switch is in its second position to provide the drive pulse to the load circuit. According to specific embodiments of the present invention, one and only one drive pulse is provided to the load circuit per switch activation; two and only two drive pulses are provided to the load circuit per switch activation; and the time interval between consecutive drive pulses may be varied utilizing a potentiometer.