Powered air respirator
AssigneeMinnesota Mining and Manufacturing Company
InventorsRichard C. Berg, Emil J. Kvall
Life of this patent
Estimating the term…
Abstract
A powered air respirator which provides hardhat (safety helmet), respiratory, eye and face protection and comprises a hardhat, a shell member spaced from and overlying the hardhat, air filtering means in the space between the shell member and the hardhat, a face shield assembly attached to and depending from the front of the shell member, a transparent face shield in said face shield assembly, face sealing means on the peripheral edge of said face shield assembly to seal against a user's face from temple to temple and an air circulating means located in the rear portion of the shell member is disclosed.
Claims6
A powered air respirator providing hardhat, respiratory, eye and face protection comprising a hardhat, a shell member secured to said hardhat and spaced therefrom to form a generally dome shaped passageway therebetween, a face shield assembly attached to and depending from the front of said shell member having a peripheral edge which extends down the sides of the user's face from a point just slightly below the temples and across the bottom of the chin, a transparent face shield in said face shield assembly, face sealing means on the peripheral edge of said face shield assembly and terminating adjacent each temple of the user, to seal against a user's face from temple to temple, the terminal ends of said face sealing means being spaced from said shell member to define air exists from each side of said face shield assembly adjacent the temples of the user, and means for providing filtered air through said dome shaped passageway in a stream over the user's face and through said air exits above the user's temples.
A powered air respirator comprising a hardhat having inner and outer surfaces, said hardhat having a lower open portion for receiving a user's head;
- supporting harness means located within the hardhat for supporting the hardhat on and spacing the inner surface thereof from the user's head;
- an outer shell member having inner and outer surfaces overlying the outer surface of said hardhat, said shell member and said hardhat being sealingly connected to each other along the superposed side peripheries and being otherwise in spaced relation defining between the outer surface of said hardhat and the inner surface of said shell member a domed longitudinal passageway extending between the front portion and rear portion of said shell member and having a slotted front opening formed between the outer surface of said hardhat and the inner surface of said shell member;
- filter means in said passageway extending substantially the full length thereof;
- a protective face shield assembly attached to and depending from the front edge of said outer shell member, said protective face shield assembly including a frame which extends down the sides of the user's face from a point just slightly below the temples and across the bottom of the chin;
- a transparent face shield fitted within the frame;
- face sealing means disposed along the peripheral edge of the frame and terminating adjacent each temple of the user to sealingly engage the user's face from temple to temple, the terminal ends of said face sealing means being spaced from said shell member to define air exits from each side of said face shield assembly adjacent the temples of the user and air circulating means mounted on a flange which sealingly engages the outer shell member to close the rear opening of said longitudinal passageway, said air circulating means extending into the space between the outer surface of said hardhat and the inner surface of said outer shell member and being connected to said filter means for directing air through said filter means, along the passageway forwardly of the outer surface of said hardhat, through the slotted front opening, downwardly across the face of the user and through said air exists at the user's temples.
Dependencies are inferred from the claim text.