Air escape filter apparatus
First Claim
1. An air escape filter apparatus for emergency use by a person comprising a filter having an exterior filter housing, a half mask defining a space and adapted to engage around the nose and mouth of a person, said half mask having an opening and a sleeve portion defined around said opening, a guide ring carried by said sleeve portion and engaged around said filter housing, said filter housing being slidable on said guide ring from a retracted standby position in and substantially filling said half mask space to an extended use position extending at least partly out of said half mask space in said half mask opening, said filter housing having a length substantially co-extensive to a length of said half mask space, and a bellows connected between filter housing and said half mask for permitting movement of said filter housing between its retracted standby position and its extended use position whereby, with said filter housing in its extended use position, at least some of said half mask space is available for the nose and mouth of a person.
1 Assignment
0 Petitions
Accused Products
Abstract
An air escape filter apparatus for emergency use by a person comprises a filter which is contained within a filter housing which is accommodated within a half mask portion of a breathing mask which is adapted to be engaged over the nose and mouth of a person. The half mask portion includes a sleeve portion having a guide ring which engages over the filter housing and is shiftable along the filter housing while remaining in holding engagement therewith. The filter housing is of a size so that it is retainable within the half mask portion in a standby condition at which time it is substantially coextensive in length with the half mask portion so that the two elements are accommodated within a very small space. The filter is extensible at the end of the sleeve portion to free the interior of the half mask for engagement over the wearer'"'"'s face in a ready condition.
47 Citations
6 Claims
- 1. An air escape filter apparatus for emergency use by a person comprising a filter having an exterior filter housing, a half mask defining a space and adapted to engage around the nose and mouth of a person, said half mask having an opening and a sleeve portion defined around said opening, a guide ring carried by said sleeve portion and engaged around said filter housing, said filter housing being slidable on said guide ring from a retracted standby position in and substantially filling said half mask space to an extended use position extending at least partly out of said half mask space in said half mask opening, said filter housing having a length substantially co-extensive to a length of said half mask space, and a bellows connected between filter housing and said half mask for permitting movement of said filter housing between its retracted standby position and its extended use position whereby, with said filter housing in its extended use position, at least some of said half mask space is available for the nose and mouth of a person.
Specification