Safety edge for a door
OwnerNorman K. Millerinventor
Life of this patent
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Abstract
A safety door edge switch including a flexible sheath, an internal resiliently compressible foam formation in the sheath and providing fluid communication therealong, a relatively rigid transverse structure at one region in the sheath and containing a pressure sensitive switch element communicating with the inner formation for sensing pressure throughout the sheath and a pair of spaced confronting flexible contact sheaths engageable to provide a secondary switch.
Claims6
A safety edge for a door or the like comprising an elongate outer sheath fabricated of flexible air impervious material and adapted for attachment to a door edge, airtight end closures on said sheath, an elongate inner formation of resiliently compressible foam configured to conformably occupy the interior of said outer sheath and being compressible under external pressure applied to said outer sheath, said inner foam including a longitudinally extending intermediate layer having transverse through openings defining therebetween partitions having longitudinal openings communicating between the transverse through openings, and a substantially rigid incompressible transverse structure in one region of said sheath, and having a configuration conforming to the interior cross-section of said sheath to effectively prevent deformation of the sheath, and fluid passage means communicating from said one region throughout the remaining interior region of said sheath, and a pressure sensitive switch element protectively located in said transverse structure within said sheath for sensing pressure change throughout said sheath without subjecting the switch element to external pressure.
Dependencies are inferred from the claim text.