Shock isolation for selective call receivers

Details Shock isolation for selective call receivers Shock isolation for selective call receivers

1991-05-13

1994-04-26

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455 90, 455351, 361753, 361814, 34082544, H04B 700

Patent

active

053075080

ABSTRACT:
A shock isolator (30) is provided within the housing (38) of a selective call receiver to substantially increase the natural frequency of vibration of the housing (38) and the printed circuit boards (54, 56) within the housing. The shock isolator (30) is a body of elastomeric material, preferably butyl rubber, which has component receiving apertures (32) molded therein for receiving the components (46, 48, 50) on the printed circuit board while at the same time contacting the printed circuit board. The butyl rubber has a damping of at least 25% (preferably 50%) and a Durometer of between 50 and 70 type A (preferably 60).

REFERENCES:
patent: 3443661 (1969-05-01), Sciver
patent: 3693089 (1972-09-01), Hutchinson et al.
patent: 4001655 (1977-01-01), Voyles et al.
patent: 4414606 (1983-11-01), Anderson et al.
patent: 4694555 (1987-09-01), Russell et al.
patent: 4833726 (1989-05-01), Shinoda et al.

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