Shotgun gunlock
US5012606A · kind A · utility
Inventor
Key dates
| Filing date | Aug 1, 1989 |
| Grant date | May 7, 1991 |
| Priority date | — |
| Expiry date | Aug 1, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05B47/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A solenoid current regulating circuit for use with shotgun gunlocks wherein the circuit provides a high activation current to flow momentarily to the coil so that the bolt of the solenoid controlled gunlock can be drawn back. However, upon continued depression of the activation switch, the circuit of the present invention automatically reduces the holding current to the solenoid coil so that the coil is protected from current damage. The circuit utilizes a resistor/capacitor network having an RC constant of less than one second for providing delayed biasing of a transistor which, when in its conductive state, reduces the gain of a current source transistor thereby reducing the current for the solenoid coil and thereby reducing the current flow through the coil of the solenoid to a level sufficient to hold the solenoid active and retain the bolt in its unlocked position. The reduced current flow will not permit the coil to be overheated and eventually opened by what otherwise would be a continuously high current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.