Shading device for welding helmet

Details Shading device for welding helmet Shading device for welding helmet

2005-12-23

2011-10-11

Wong, Tina M (Department: 2874)

Liquid crystal cells, elements and systems

Liquid crystal system

Liquid crystal eyewear

C349S016000, C002S008600

Reexamination Certificate

active

08035761

ABSTRACT:
Disclosed is a shading device for a welding helmet in which a circuit portion (the second frame) having a high error rate and the remaining portion can be separated from each other and only the circuit portion separated from the device can be repaired or changed, thereby the maintenance and repair are harmoniously. The shading device for a welding helmet comprising a first frame comprises a first body having a LCD module with contacting portions formed at both sides of a LCD window and a first joint portion formed at one end portion of the first body, a second frame comprising a second body32having a power supplying portion and a second joint portion attachable and deattachable to the first joint portion of the first frame at one end portion thereof, a pair of electrodes having one side thereof electrically contacted with the contacting portions respectively, and an electrically conductive means for electrically connecting the power supplying portion with the corresponded electrodes.

REFERENCES:
patent: 5533206 (1996-07-01), Petrie et al.
patent: 6070264 (2000-06-01), Hamilton et al.
patent: 6973672 (2005-12-01), Huh
patent: 7342210 (2008-03-01), Fergason
patent: 2004/0179149 (2004-09-01), Wang-Lee

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