| 摘要 |
An electrical switch mechanism which operates in response to predetermined deceleration and/or acceleration is especially adapted for use on board trains for brake assurance purposes. Switch contacts biased to a safe switching condition are actuated by an arm. A pendulum pivots a predetermined distance with respect to the vertical in response to a predetermined acceleration or deceleration. The arm is carried by the pendulum and may be mounted on a bracket plate such that the arm is set at a predetermined inclination with respect to the vertical. The arm actuates the switch contact only when the train reaches the predetermined acceleration or deceleration. The switch mechanism is vital in operation in that the safe switching state is maintained in the absence of actuation. By adjustment of the bracket and arm inclination, the mechanism can be set to respond to different selected accelerations and/or decelerations. Two sets of contacts biased in opposite directions may be actuated by separate arms each carried by the pendulum. The mechanism is then responsive to deceleration in opposite directions and is especially useful in trains which run in opposite directions without turning around, such as subway trains. |
