Respirator headpiece and release mechanism

• US 6,338,342 B1
• Filed: 02/22/1999
• Issued: 01/15/2002
• Est. Priority Date: 02/22/1999
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: Cabot Safety Intermediate Corporation et al
• Inventors: Fecteau, Keith E., Honan, David, Krauss, Kevin
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): SRIVASTAVA, VIRENDRA KUMAR
• Application Number:
  US09/255,601
• Time in Patent Office: 1,058 Days
• Field of Search: 128/207.11, 128/206.12, 128/201.24, 128/202.27, 128/206.27, 128/207.17, 128/206.28, 128/206.24, 128/204.27
• US Class Current: 128/207.11
• CPC Class Codes: A62B 18/084 Means for fastening gas-masks to heads or helmets

Abstract

A quick release mechanism and headpiece for use with a respirator. The quick release mechanism uses an over center latch pivotly attached to a yoke to control the tension in a pair of upper tension cords. In the latched position the upper tension cords traverse the yoke and together with a pair of lower tension cords support and seal the respirator mask against the face of the wearer. In the unlatched position the upper tension cords loosely support the mask below the chin of the wearer in a parked position. The upper and lower tension cords are attached to a circular shaped headpiece having a crown piece fitting to the top of the head of the wearer and a base portion fitting to the back of the head of the wearer. The headpiece is advantageously comprised of multiple layers wherein the outer layer is comprised of a rigid material and the inner layer is comprised of a compliant material. The rigid layer provides necessary structure to headpiece and the inner layer provides compliance and comfort to the head of the wearer.

Claims

1. A respirator to be worn on the head of a wearer, the respirator having a face mask portion to seal against the face of the wearer and cartridge type filters mounted on opposing sides of the mask, the respirator comprising:

a yoke attached to the face mask, the yoke having a pair of openings fitting over the filters, a hinge disposed on a front portion of the yoke, and a pair of guide holes positioned in the yoke;

a latch pivotally attached to the hinge, the latch pivoting between an unlatched and latched position and having a pair of lock holes positioned at an end portion opposite the hinge;

a headpiece forming a continuous substantially ring shape having a crown portion fitting over a top portion of the head, a base portion fitting over a back portion of the head, a side portion positioned on opposite sides of the ring between the crown portion and the base portion, an upper cord attachment hole positioned between each of the side portions and the crown portion, and a lower strap attachment loop positioned between each of the side portions and the base portion;

a pair of upper cords attached to the headpiece at the upper attachment holes and passing through the guide holes and the lock holes; and

a pair of lower straps disposed between the lower strap attachment loops and a pair of attachment points positioned at a bottom portion of the yoke.

2. A respirator as set forth in claim 1 wherein the cords are comprised of a resilient material having a substantially round cross section.

3. A respirator as set forth in claim 1 wherein a tension force is produced in the cords in the latched position biasing the face mask against a face of a wearer and sealing the face mask to the face thereby.

4. A respirator as set forth in claim 1 wherein the attachment points each comprise a cinching mechanism comprising a pair of slots.

5. A respirator as set forth in claim 3 wherein the cinching mechanisms comprise a D-ring attached to the yoke.

6. A respirator as set forth in claim 1 wherein the yoke is comprised of a rigid plastic material.

7. A respirator as set forth in claim 1 wherein the latch is comprised of a rigid plastic material.

8. A respirator as set forth in claim 1 wherein the headpiece comprises a strap having a length, a first end and a second end and wherein the first end and second end are releasably attachable to one another to vary the length of the strap forming the continuous ring shape.

9. A respirator as set forth in claim 8 wherein the strap includes an inside surface and an outside surface and a hooked fastener patch is disposed on either the first end or second end and further on either the inside surface or the outside surface and a looped fastener patch is disposed on the end and on the surface opposite the hooked fastener patch and cooperates with the hooked fastener patch to releasably attach the ends in an overlap fashion.

10. A respirator as set forth in claim 9 wherein the strap includes a plurality of slots and wherein a hook is attached to either the first end or the second end and the hook cooperates with at least one of the slots to releasably attach the ends in an overlap fashion.

11. A respirator as set forth in claim 8 wherein the strap comprises at least an inner layer and an outer layer, wherein the inner layer is comprised of a resilient material and the outer layer is comprised of a rigid material.

12. A respirator as set forth in claim 11 wherein the resilient material is comprised of an elastomeric foam having a density from about 4 pounds per cubic foot to about 8 pounds per cubic foot.

13. A respirator as set forth in claim 11 wherein the rigid material is comprised of a plastic.

14. A respirator as set forth in claim 11 wherein the resilient layer includes a plurality of raised portions distributed along the length of the strap.

15. A respirator as set forth in claim 14 wherein the inner layer and the outer layer are joined in a compression molding process and wherein the raised portions are compression molded thereby.

16. A respirator as set forth in claim 11 wherein the inner layer and the outer layer are bonded together by a third layer positioned therebetween.

17. A respirator as set forth in claim 11 wherein the headpiece further comprises a relief channel disposed within the inner layer from each of the upper cord attachment holes to a periphery of the strap.