US 4,542,538 AGranted

Disposable protective film accessory for the lens of a respirator hood

AssigneeE. D. Bullard Company

InventorsAnthony L. Moretti, Anselmo P. Pellolio, Jr.

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Abstract

A disposable protective film accessory for use with a hood assembly including an optically transparent lens panel. The accessory includes an elongated sheet of thin, flexible transparent film having a length many times the length of the lens panel and a width which is at least a substantial portion of the width of the lens panel. The sheet of film is tightly rolled about an axis normal to the length thereof. The roll of film is loosely contained in a housing comprising an open sided cavity which is mounted on the exterior surface of the lens panel at one end thereof with the open side of the cavity against the lens panel. A tensioning bar member is mounted across the other end of the lens panel in contact with the exterior surface thereof. The free end of the protective film is pulled out of the cavity between the housing and the lens panel, across the exterior surface of the lens panel and between the lens panel and the tensioning bar member. The edge of the sheet of protective film projecting beyond the tensioning bar member is slit to promote the tearing of the free end of the sheet of protective film by a twisting movement thereof against the tensioning bar member to enable the removal of contaminated portion of the film for disposal.

Claims20

Dependent claims

A disposable protective film accessory for use with a face and head protective hood assembly including an optically transparent lens panel of a given length and a given width, said accessory comprising:

(a) an elongated sheet of thin, flexible transparent protective film having a length many times greater than said given length of said lens panel and a width which is at least a substantial portion of said given width of said lens panel, a longitudinal side of said sheet of protective film having a plurality of short slits therein extending transversely of the length of said sheet and spaced from each other by a distance less than said given length of said lens panel, said sheet of protective film being rolled about an axis extending normally to the length thereof;
(b) a housing loosely containing said rolled sheet of protective film, said housing comprising an elongated open sided cavity having a depth greater than the diameter of said rolled sheet of protective film and a length greater than said given width of said sheet of protective film, said housing including a flat rectangular flange surrounding said open sided cavity;
(c) a tensioning bar member having a length greater than said given width of said sheet of protective film;
(d) means for mounting the ends of said tensioning bar to said lens panel with the portion of said tensioning bar member intermediate the ends thereof extending along one end of said lens panel in compressive unobstructed contact with the exterior surface of said lens panel, and
(e) means for mounting the ends of said rectangular flange of said housing in compressive contact with the exterior surface of said lens panel with one side of said rectangular flange extending along the other end of said lens panel and with the other side of said rectangular flange in spaced generally parallel relation to said tensioning bar member and in compressive unobstructed contact with the exterior surface of said lens panel;
whereby the free end of said sheet of protective film may be pulled out of said housing between said other side of said flange and the exterior surface of said lens panel, across said exterior surface of said lens panel and between said tensioning bar member and said exterior surface of said lens panel to hold a length of said sheet of protective film in contact with said exterior surface of said lens panel and whereby said slits promote the tearing of the free end of said sheet of protective film projecting beyond said tensioning bar by a manual twisting of said free end of said sheet of protective film against said tensioning bar member.

3 more elements

A disposable protective film accessory for use with a face protective assembly including an optically transparent lens panel of a given length and a given width, said accessory comprising:

(a) an elongated sheet of thin, flexible transparent protective film having a length many times greater than said given length of said lens panel and a width which is at least a substantial portion of said given width of said lens panel, said sheet of protective film being rolled about an axis extending normally to the length thereof;
(b) a housing loosely containing said rolled sheet of protective film, said housing comprising an elongated open cavity having a depth greater than the diameter of said rolled sheet of protective film and a length greater than said given width of said sheet of protective film;
(c) a tensioning bar member having a length greater than said given width of said sheet of protective film;
(d) means for mounting the ends of said tensioning bar member to said lens panel with the portion of said tensioning bar member intermediate the ends thereof extending along one end of said lens panel in unobstructed relation to the exterior surface of said lens panel;
(e) means for mounting said housing on the exterior surface of said lens panel with one side of said elongated open cavity extending along the other end of said lens panel and with the other side of said elongated open cavity in spaced generally parallel relation to said tensioning bar member and in unobstructed relation to said exterior surface of said lens panel;
whereby the free end of said sheet of protective film may be pulled out of said housing between said other side of said housing and said exterior surface of said lens panel, across said exterior surface of said lens panel and between said tensioning bar member and said exterior surface of said lens panel to hold a length of said sheet of protective film in contact with said exterior surface of said lens panel and;
(f) a short slit in the edge of said free end of said sheet of protective film on the opposite side of said tensioning bar member from said housing whereby said free end of said sheet of protective film projecting beyond said tensioning bar member may be torn off by manual twisting of said free end of said sheet of protective film against said tensioning bar member.

4 more elements

Dependencies are inferred from the claim text.