| 摘要 |
A security timer, add-on device, for an automated, electrically-powered, garage door causes the door to close after it has been opened for predetermined time, e.g., four and a half minutes. The security timer consists of a relay, two micro switches, bell wire, and electrical wire. The relay, in parallel with the electric light, which is controlled by the automatic electric garage door opener, is thus energized, i.e., the points are opened, when the light is energized. Thus, the normally closed (N/C) relay opens and remains open while the light is lit. The first micro switch (M/S), normally opened (N/O), is in series with the relay, and is attached to one of the points of the relay, the other end, of the M/S, is attached to a push-button wall switch, which can also be used to control the garage door openings or closings. This M/S has a whisker which comes in contact with the door when it is fully open; thereby closing the M/S. If the first M/S is closed while the relay is closed, then this will cause the garage door opener to close the door. This is equivalent to pushing the button, on the garage wall, to close the door. Since reversing operation is required, in case of obstructions, etc., in the path of the closing door; this security timer will not interfere with the reversing safety feature since the door must be in the fully opened position for the M/S to be activated, i.e., the whisker to make contact. The optional second M/S, which could be an ordinary push-button switch, is in parallel with the first M/S in order to provide deactivation of the first when it is desired that the door remain open, i.e., deactivation of the automatic closing feature, or to effectively close the first M/S. The particular garage door opening system depicted in this application also has an open door indicator light option, installed inside of the house. Thus, this device will prevent the garage door from being inadvertently left opened, or if accidentally opened by stray radiation, e.g., from aircraft or a neighbor's transmitter, automatically closed.
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