http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-791660-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3e1018b924ad1e238642eaad9d2172a7 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61F11-14 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61F11-14 |
| filingDate | 1955-05-18^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a9516541f12a6559052ae26c4c9538ad http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f55c3bec138fce360f1ca03482ff4c5b |
| publicationDate | 1958-03-05^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-791660-A |
| titleOfInvention | Ear defender |
| abstract | 791,660. Ear protectors. NATIONAL RESEARCH COUNCIL. May 18, 1955 [May 20, 1954], No. 14350/55. Class 81 (2). An ear protector comprises a rigid non- porous cup to fit over the ear, a cushion supported by the rim of the cup and means for pressing the cushion into engagement with the head around the ear, the cushion having a high spring constant so that it does not vibrate when subjected to sound and being in the form of a non-expansible, non-porous, flexible, endless tube which is partially filled with non-gaseous fluid material having a viscosity below about 1m poises but is substantially free of gas and has no unfilled space. A continuous flexible inexpansible tube 20 is secured to a rigid cup 18 and has a filling tube 21 for a liquid having a viscosity below 1m poises, e.g. cane sugar syrup. The cup 18 is secured to a threaded stub 14 by a ball joint 17, the threaded stub 14 having a wing nut 15 to secure the cup 18 to a resilient head frame 11 having a central sponge rubber head pad 12. The frame 11 presses the cup 18 and the filled tube 20 against the head so that the exposed edges of the tube 20 assume a semicircular shape in cross-section. Seams, wires or other metal structures may be placed so that they extend completely round the inner and outer exposed portions of the tube 20 and so that, when the cup 18 is pressed against the tube 20 and the head, they resist deformation more than the tube wall and form a line of discontinuity in the curvature of the tube wall. The tube 20 is filled so that it is dilated to more than a quarter of its full cross-section but less than its full cross-section. The tube 20 is made of a material, e.g. plasticised polyvinyl chloride resin, having a high dynamic Young's modulus of about 5 Î 10<3> p.s.i., a high internal resistance and a thickness of 0.005 to 0.01 inch. The width of the rim 19 of the cup 18 is substantially the same as the radial width of the filled tube when the latter is pressed against the head. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11633303-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2017167722-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6678897-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-0160293-A1 |
| priorityDate | 1954-05-20^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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