| 摘要 |
A shock-activated, sonic alarm is silent when in an armed or cocked condition. In this condition, a spring-loaded lance (108) is restrained by a ball (104) from activating an alarm (100). When the alarm is tilted, or dealt a sharp blow, the ball (104) is dislodged and frees the lance (108) to pierce a membrane in a gas cylinder (102), resulting in a loud alarm. Alternatively, a normally-closed switch (208) is held in an open condition by a ball (204). When the ball (204) is dislodged from its position on the plunger (207) of the switch (208), a buzzer (212) is activated, resulting in a loud sound. The alarm can be placed in any location where it is desirable to sound an alarm in response to a physical trauma, such as in a traffic barrier or dangerous goods shipment.
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