公开(公告)号：US5477018A

公开(公告)日：1995-12-19

申请号：US102454

申请日：1993-08-05

Applicant: Hjalmar Fries ,  Per Hedmark

Inventor： Hjalmar Fries ,  Per Hedmark

IPC: G01M3/04 ,  G01M3/16 ,  H01H35/42 ,  H01H35/00 ,  H01H11/00

CPC classification number: H01H35/42

Abstract: One end of a dual-ended housing is closed off by a plug formed of a first constituent which is a water-soluble material and a second constituent which is a thermosetting resin and forms a readily-frangible structure in the plug. An electrical switch which has an actuating plunger is set, in the housing against the plug, so that the latter holds the plunger depressed/retracted. Moisture expands the water-soluble material which, in turn, destroys the plug integrity and, subsequently, the plug is so weakened that the plunger breaks through the frangible structure to actuate the switch.

Abstract translation: 双头壳体的一端由作为水溶性材料的第一成分和作为热固性树脂的第二成分形成的塞子封闭，并在塞子中形成易碎的结构。 具有致动柱塞的电气开关在壳体中抵靠插塞设置，使得该开关保持柱塞被压缩/缩回。 水分膨胀水溶性材料，这反过来又破坏了插头的完整性，随后插头被如此削弱，使得柱塞突破易碎结构以致动开关。