Patent ID: 8549672

Claim:
A protective face mask system comprising: a flexible mask body including an opening for receiving a lens, comprising: a nose portion, a central receiving slot located adjacent the nose portion, right and left temple portions, each temple portion having a shaped receiving opening therethrough, left and right cheek portions, at least one groove located adjacent one of the left and right cheek portions; a lens sized to be received upon and cover the lens opening, the lens including right and left temple portions including openings therein positioned to correspond to and align with an opening of the mask body when the lens is positioned for attachment to the mask body, the lens including at least a portion that snappingly engages the at least one groove when a portion of the lens is inserted into a slot; at least one fastener including a moveable portion, the fastener including an extension portion insertable in an opening in the mask body and the corresponding opening in the lens when the lens is positioned for attachment to the mask body, the fastener securing the lens to the mask body when the moveable portion is turned relative to the extension portion at least about a quarter turn from a first position to a second position; the fastener comprising a retaining element including a retaining wall portion, a retaining extension extending from a face of the retaining wall portion and sized and shaped to insert into one of the mask body openings and the corresponding lens opening, and, a retaining clip rotatable from a first unlocked position to a second lock position, the retaining clip including a retaining clip opening sized and shaped to receive at least a portion of the shaped retaining extension; the retaining extension of the retaining element configured to be inserted from an outside surface of the lens through the opening in the lens and through the corresponding opening in the mask body, and the retaining clip engages the retaining extension adjacent an inner surface of the mask body; the retaining extension comprising a base extending from the retaining wall having a generally trapezoidal shape, a tab having a generally trapezoidal shape, and, a post extending between the base and the tab having a generally ovoid shape; wherein the opening in the retaining clip further comprises a cam surface for engaging the post.