US 4,258,710 AGranted

Mask-type respirator

OwnerFred L. Reberinventor

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Abstract

Respirator of the mask-type covering the nose and mouth of a wearer to protect him from environments containing air-borne obnoxious particles and gases having a combination of a compressed air inlet regulator on the face of the mask, internal baffling which directs inlet air downwardly past the nose of the wearer, and spaces at the mask's sides in the wearer's cheek area and below his mouth to effect an air flow through and out of the mask in a downward direction with little annoyance to the wearer, to assist in exhausting exhaled breath from the mask, and to form an "air-curtain" at the mask's outlet spaces that prevents entry into the mask of obnoxious particles and gases. The mask is further adapted for quick coupling and uncoupling to and from supply lines of air under pressure and for use with air supply lines of widely varying supply pressures.

In a mask-type respirator including a head-supported, cup-like mask opened at the rear and shaped to be adapted to engage the face and to enclose the nose and mouth of a wearer and having air inlet means whereby air under pressure is introduced into the interior of said mask at a point above the mouth of the wearer, the features comprising:

(a) an opening in the front of said mask,
(b) compressed air valve means located in said mask front opening, said valve means having an outlet into the interior of said mask and an exterior inlet for connection to a supply of compressed air, said valve means being adapted to be manually adjusted by the wearer of said mask to thereby vary the flow of air into said mask,
(c) compressed air supply means connected to said valve means inlet,
(d) a coupler element positioned in said air supply means, adjacent said mask valve means whereby said mask can be uncoupled from said air supply,
(e) baffle means located within said mask, intermediate said valve means outlet to said mask interior and the nose of the wearer of said mask, whereby air entering said mask through said valve means is directed downwardly within said mask below the nose of the wearer,
(f) outlet means from said mask for exhaled breath of the wearer, said outlet means comprising the sides of said mask, in the regions of the cheeks of the wearer below the mouth of the wearer, being shaped to be in spaced relationship with respect to the cheeks of the wearer, and provides an essentially tight fit about the bridge of the wearer's nose and chin and along the cheeks of the wearer from the bridge of the nose to a point below the wearers mouth where said outlet means is provided whereby said mask sides and the cheeks of the wearer define therebetween narrow openings to the atmosphere from the interior of said mask, whereby a main flow of air autogenously is established through said mask that follows a path downwardly from said air inlet, then downwardly around said baffle means, then downwardly past the mouth of the wearer, and downwardly then out of said mask through said mask outlet means.

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Abstract

Claims5