Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-03-30
1986-12-30
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6167, 200 6193, 340546, 340571, 340574, 340687, 340689, G08B 1300, G08B 1308, G08B 1314
Patent
active
046332324
ABSTRACT:
The invention is concerned with a personal alarm device which can be used for a variety of alarm purposes. In one application, the device is used to sound an alarm when there is an impending attack. This is accomplished, after cocking of the alarm, by simply releasing a removable member which falls away. In another application of the device, the alarm can be carried in a purse or other receptacle and is effective to sound the alarm if the purse is moved away from the hand of the user. In still another application, the device may be used to detect the opening of a window or the relative movement of two members which are normally in substantial engagement with each other. In still another arrangement, the device is used for detecting the withdrawal of the latch bolt of a door.
The device employs an electrically-operated alarm, a battery and two switches, all mounted within a housing. The first switch is biased to closed position and is normally held open by a key member which can be withdrawn to permit the switch blade to move to closed position. The key member is always ultimately withdrawn, regardless of which application the alarm is being used for. Where it is being used as a manually-carried alarm, the engagement of the hand with a release plate keeps the switch from closing. The other switch is employed in connection with several of the other applications and is connected in series with the first switch.
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Radio Shack Catalog, p. 108.
Advertisement and Order Blank for Startler Alarm.
Selected advertisements on door hanger alarms, including advertisement of DOOR-ALERT, WATCHDOG Intruder Alarm and Intruder Alarm and doorknob alarm.
Advertisement of Amway door alarm.
Jamieson John R.
Nelson Frederic P.
Mullen Jr. Thomas J.
Nelson Frederic P.
Rowland James L.
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