Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-12-17
1991-12-10
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6176, 200274, 340548, 340693, 361170, G08B 1308, H01H 316
Patent
active
050722123
ABSTRACT:
A self contained alarm is arranged to be attached to a door or near a building opening. One version uses a spring loaded switch held open by a door frame, which closes and sounds an audible alarm when the door is opened. A relay with normally open contacts is energized with the alarm to maintain the alarm until a reset switch is opened by a card or key inserted into a mating slot. Another version uses a rotary trip switch which is operated by a line. The line is placed across a building opening to be guarded and closes the rotary switch if the line is disturbed. A second embodiment uses an arm-disarm switch also operated by a card or key inserted into a mating slot to control a second relay. This arm-disarm switch is placed in a second box on the outside of a door to be guarded to permit arming the alarm after the door is closed. Here contacts of the second relay keep the alarm circuit open until the card or key is withdrawn to provide an arm-disarm function.
REFERENCES:
patent: 3261010 (1966-07-01), Kardel
patent: 3270333 (1966-08-01), La Barber
patent: 3378830 (1968-04-01), Patrick
patent: 3720937 (1973-03-01), Lang et al.
patent: 3745551 (1973-07-01), Smith
patent: 3878539 (1975-04-01), Gooding
patent: 3887909 (1975-06-01), Beiswenger et al.
patent: 4059832 (1977-11-01), Conklin
patent: 4258359 (1981-03-01), McLamb
patent: 4275391 (1981-06-01), Okamura
patent: 4340884 (1982-07-01), Maizland
patent: 4438428 (1984-03-01), Ober et al.
patent: 4484181 (1984-11-01), Schwartz
patent: 4586028 (1986-04-01), McKinzie
patent: 4808974 (1989-02-01), Cantley
Jacobson Donald A.
Mullen Jr. Thomas J.
Swann III Glen R.
LandOfFree
Entry alarm does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Entry alarm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Entry alarm will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1043535