Tamper resistant speaker grille for intercom module

Details Tamper resistant speaker grille for intercom module Tamper resistant speaker grille for intercom module

1989-06-08

1990-04-24

Fuller, Benjamin R.

Acoustics

Sound-modifying means

181150, G10K 1100

Patent

active

049192272

ABSTRACT:
A speaker grille is provided which protects the speaker diaphragm from tampering or vandalism. Speakers which are used in public places for intercoms, message transmission, voice synthesis instructions, or the like will be covered by the speaker grille which has two sets of misaligned sound transmitting apertures, which will allow sound to emanate from the speaker, but will prevent objects from being pushed through the grille apertures to the diaphragm. Each set of apertures is found in a separate grille component, and the components are then assembled to form the improved grill. The construction of the grilled assembly is such that it will resist most attempts to break it with commonly carried items.

REFERENCES:
patent: 3909530 (1975-09-01), Gosswiller
patent: 3989909 (1976-11-01), Hodsdon et al.
patent: 4832150 (1989-05-01), Juset et al.

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