| 摘要 |
<p>Personal alarm device which can be used for a variety of alarm purposes. In one application (Figures 1 through 6), 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 (36) which falls away. In another application of the device (Figure 7), the alarm can be carried in a purse (52) 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 (Figure 8), 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 (Figures 10 through 12), the device is used for detecting the withdrawal of the latch bolt of a door. The device employs an electrically-operated alarm (20), a battery (21) and two switches, all mounted within a housing. The first switch (27) is biased to closed position and is normally held open by a key member which can be withdrawn to permit the switch blade to move to closed position. The key member is always ultimately withdrawn, regardless of which application the alarm is being used for.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 (36) keeps the switch from closing. The other switch (41) is employed in connection with several of the other applications and is connected in series with the first switch.</p> |
