| 摘要 |
A switch for closing an electrical circuit upon relative movement of a pair of members includes a hollow cylindrical tube mounted adjacent one end to one of the members. The other end of the tube is provided with a sharpened edge. A support member of shearable insulating material is mounted to the other member and includes a first cylindrical portion receiving and piloting the free end of the tube and a second adjacent cylindrical portion of larger diameter. In one embodiment, a second contact member includes a first cylindrical portion embedded within the first portion of the support member and a second larger cylindrical portion embedded within the second portion. Upon relative movement of the members, the sharpened edge of the tube shears off the outer layer of the second portion and engages the second portion of the second contact member to close a circuit across a source of power. In another embodiment, a rod extends through both portions of the support member and spaced contacts are embedded within the second portion in the path of movement of the tube for electrical contact thereby when the tube shears off the outer layer of the second portion of the support member.
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