Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-11-02
1997-04-01
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
340539, 340574, 455100, 200532, G08B 2300
Patent
active
056170742
ABSTRACT:
A child finder basically consists of a transmitter which is concealingly attachable to a child's body and which sends a signal to a conventional receiver so that the child's location can be continually monitored. The transmitter will typically be carried in an article of jewelry, such as a watch, bracelet, ring, or the like, and will use a special on/off switch which allows the transmitter to be activated only when the jewelry is being worn by the child. The switch includes a reciprocal push button which closes the transmitter's electrical circuit when depressed, and the button is spring-biasedly moved away from electrical contact with the transmitter's circuit when the article of jewelry is not being worn. To protect against inadvertent partial movement of the button which could break electrical contact thus deactivating the transmitter an electrical contact surface of the button is provided with an upwardly extending electrically conductive spring finger which maintains continual electrical contact irrespective of temporary and inadvertent reciprocal movement of the push button. When the push button is totally depressed, the spring finger recedes into a provided groove on the electrical contact surface of the button so as to prevent the finger from causing interference between the primary electrical contact surfaces.
REFERENCES:
patent: 4063410 (1977-12-01), Welling
patent: 4591836 (1986-05-01), Feigenblatt, Jr. et al.
patent: 4694284 (1987-09-01), Leveille et al.
patent: 4736196 (1988-04-01), McMahon et al.
patent: 5223818 (1993-06-01), Polo
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