Patent ID: 8826464

Claim:
A filter holding system for holding an optical filter to a mask casing of a welding mask, the filter holding system comprising: a holding frame body configured to support and accommodate the optical filter; and a connecting mechanism provided on the holding frame body, the connecting mechanism being configured to connect and disconnect the holding frame body to and from the mask casing, wherein the connecting mechanism is moveable between a disconnect position and a connect position; wherein, when at the disconnect position, the connecting mechanism disconnects the holding frame body from the mask casing such that the holding frame body and the mask casing are separable from each other; wherein, when at the connect position, the connecting mechanism connects the holding frame body to the mask casing; wherein the connecting mechanism further comprises a connecting pin and a manipulating unit; wherein the connecting pin is accommodated in a connecting pin accommodating cavity of the holding frame body; wherein, when at the connect position, the connecting pin extends laterally out of the connecting pin accommodating cavity of the holding frame body such that the connecting pin is adapted to be disposed in an accommodating cavity of the mask casing and wherein, when at the disconnect position, the connecting pin does not extend laterally out of the connecting pin accommodating cavity of the holding frame body, such that at the disconnect position the connecting pin is not adapted to be disposed in the accommodating cavity of the mask casing; wherein the manipulating unit is connected to the connecting pin such that movement of the manipulating unit is configured to switch the connecting pin between the disconnect position and the connect position; and wherein a plurality of rails are provided on a side wall of the connecting pin accommodating cavity of the holding frame body, and the manipulating unit is disposed on the holding frame body such that the manipulating unit is slidable along the rails.