Protective helmet with removable protective lining for cushionin

Details Protective helmet with removable protective lining for cushionin Protective helmet with removable protective lining for cushionin

1990-08-10

1992-06-02

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 90, 455350, H04B 138, H04B 108

Patent

active

051195054

ABSTRACT:
Described is a protective helmet comprising an impact-resistant outer helmet shell into which a head padding (10) is removably inserted as separate inner helmet shell. The protective helmet is provided with radiotelephone equipment. With the exception of a microphone and possibly an on/off switch and a battery charge check indicator all the parts of the radiotelephone equipment are provided in recesses (32a 32b, 36-46) provided for them in the head padding (10) at the back at the rear side and at the lower peripheral edge thereof. The two recesses (36, 46) for the two loudspeakers are connected via acoustic passages formed in the head padding (10) to an acoustic cavity provided at ear level. As a result, in the temple and ear region the protective helmet is free from any metal or plastic parts which might cause injury in the event of an impact. In addition, the position of the radiotelephone equipment is chosen so that the equilibrium of the protective helmet is practically not impaired.

REFERENCES:
patent: 4130803 (1978-12-01), Thompson
patent: 4152553 (1979-05-01), White
patent: 4424880 (1984-01-01), Murayama et al.
patent: 4473130 (1984-09-01), Korber et al.
patent: 4475248 (1984-10-01), L'Abbe et al.
patent: 4524461 (1985-06-01), Kostanty
patent: 4945458 (1990-07-01), Batts et al.
Research Disclosure, No. 206, Jun. 1981, "Safety Helmet".

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