Molded head harness

• US 5,481,763 A
• Filed: 12/07/1994
• Issued: 01/09/1996
• Est. Priority Date: 01/28/1993
• Status: Expired due to Fees

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Byram, David C., Brostrom, Gerald M.
• Primary Examiner(s): Crowder, Clifford D.
• Assistant Examiner(s): Neas, Michael A.
• Application Number:
  US08/350,793
• Time in Patent Office: 398 Days
• Field of Search: 2/9, 2/11, 2/452, 2/173, 2/181, 2/209.13, 2/410, 2/424, 128/201.22, 128/201.23, 128/201.24, 128/201.25, 128/201.29, 128/206.12, 128/206.24, 128/206.27, 128/206.28, 128/207.11, 264/252, 264/275, 264/279.1
• US Class Current: 2/452
• CPC Class Codes: A62B 18/084 Means for fastening gas-masks to heads or helmets

Abstract

An insert-molded head harness for use in securing a respirator mask to the face of a wearer, wherein the head harness comprises a web having a central portion and a peripheral portion extending at least partially around the central portion, and a plurality of elastomeric fastening straps having first and second ends, the first ends being integrally bonded to the peripheral portion of the web and the second ends being adapted to be used in securing a respirator mask to the face of a wearer. The head harness can include an elastomeric flange which comprises an elastomeric resin and embeds the peripheral portion of the web. The web preferably comprises a material selected from the group consisting of woven, knitted, and non-woven materials.

Claims

1. A process for making a head harness which is adapted for use in securing a respirator mask to the face of a wearer, comprising the steps of:

a) inserting a moldable web into a mold, the web comprising a central portion and a peripheral portion extending at least partially around the central portion, the mold being adapted to receive the web as an insert and having a mold cavity shaped to permit the molding of a plurality of elastomeric fastening straps formed integrally with the peripheral portion of the web;

b) positioning and securing the web within the mold so that the peripheral portion of the web can extend into the mold cavity during the molding process;

c) clamping the blocks of the mold together at a suitable clamping pressure to thereby clamp the central portion of the web;

d) contacting the peripheral portion of the web with a molten elastomeric resin in a quantity sufficient to embed the peripheral portion of the web in the molten resin and form a plurality of elastomeric fastening straps which are integral with the peripheral portion of the web;

e) maintaining suitable pressure and temperature in the mold for a time sufficient to cure the resin and thereby form the head harness;

f) releasing the clamping pressure of the mold blocks; and

g) removing the head harness from the mold.

2. The process of claim 1, further comprising the step of clamping the peripheral portion of the web immediately prior to contacting the peripheral portion with molten resin.

3. The process of claim 1 wherein the mold includes a recess in at least one of the block surfaces, and the recess houses an adhesive which is used during the fabric positioning and securing step to position and secure the web within the mold.

4. The process of claim 1 wherein the mold includes pins which are received in appropriately sized apertures of the web during the fabric positioning and securing step to thereby assist in positioning and securing the web within the mold.

5. The process of claim 1 wherein the web comprises a material selected from the group consisting of woven, knitted, and non-woven materials.

6. The process of claim 1 wherein the peripheral portion of the web extends substantially completely around the central portion of the web.

7. The process of claim 1 wherein the web comprises a fabric mesh selected from the group consisting of polypropylene fabric meshes and polyester fabric meshes.

8. The process of claim 1 wherein the elastomeric resin is selected from the group consisting of styrene-butadiene-styrene block copolymers, ethylene propylene diene terpolymer, neoprene, and silicone.

9. The process of claim 1 wherein the elastomeric resin comprises a styrene-butadiene-styrene block copolymer.