Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1995-05-26
1997-02-04
Sough, Hyung S.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
285323, H02G 318
Patent
active
056000944
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a fixing device for a cable, tube or similar flexible or rigid filamentary product and, more particularly, to a fixing device of the kind which both anchors and seals around the filamentary product, and which does not require disassembly before the filamentary product is introduced for this purpose.
BACKGROUND ART
There are a number of fixing devices of the type or kind identified above which are known in the prior art. See, for example, those described in U.S. Pat. Nos. 3,055,972, 4,145,075, 4,371,173 and 4,513,172, and in French patent specification 2517132 A1.
Ideally, a fixing device of the subject type should be capable of performing substantially all of the following tasks to a generally satisfactory degree: product is flexible and has a core suceptable to damage no damage is sustained. of withstanding a significant pressure differential. sizes of filamentary products. prevent damage to the product.
None of the prior art fixing devices adequately perform the above identified functions.
In this regard, fixing devices of the prior art have generally either compromised universality--the ability to anchor and seal around a range of different cross-sectional shapes and sizes of filamentary products--or sealing and anchoring performance.
Another common failing is that to achieve the required anchoring effect in many prior art fixing devices a tough plastics component is caused to bite into the filamentary product, causing high load pressure which, where the product is, for example, a sheathed electrical cable, can result in damage to the conductors. This may then produce short circuits and a risk of electrocution. This problem is exacerbated where no kink protector is provided leading out from the anchoring point and the free end of the electrical cable is subject to movement.
It is an object of the present invention to at least go some way towards overcoming the above noted difficencies of the prior art, moving closer towards the above outlined ideal.
SUMMARY OF THE INVENTION
In a broad aspect of this invention there is provided a fixing device for anchoring and sealing around a filamentary product, the device comprising a body, an annular cap, a clamping ring and an elastomeric sealing sleeve, wherein: screw threaded end portion; screw threaded end portion of the body; extend a plurality of spaced apart gripping fingers; and gripping fingers of the clamping ring but extending beyond the tips thereof; the bore of the body such that the free ends of the gripping fingers are slidably engageable with an inwardly tapered portion of the bore, and the urging means of the annular cap can act directly or indirectly on the annular base member of the clamping ring to urge the free ends of the gripping fingers into the tapered portion of the bore, the free ends of the gripping fingers being configured and arranged on such urging to press the sealing sleeve against the filamentary product, thereby anchoring it in position and sealing around it, the sealing sleeve being substantially prevented from extruding passed the gripping fingers or passed the urging means.
"Filamentary product", as used in the context of this patent specification, is intended to include flexible and rigid sheathed electrical or other cabling, and flexible or rigid bars, tubes, hoses or like products.
Conveniently, the gripping fingers can slidably overlap in fan-like formation to press the sealing device against the filamentary product.
An advantage of the fixing device of the present invention is that, as any pressure differential acting across it will produce a resultant pressure from the annular cap side, the sealing sleeve is unable to extrude passed the fingers of the clamping ring. In this connection, any pressure will serve only to increase the seal integrity as the sealing sleeve is forced deeper into the tapered space created between the tips of the gripping fingers and the filamentary product.
Preferably in from the inwardly tapered portion of the bore in the body the bore increases in diameter again.
D
REFERENCES:
patent: 3055972 (1962-09-01), Peterson
patent: 4145075 (1979-03-01), Holzmann
patent: 4767135 (1988-08-01), Holzmann
patent: 4787657 (1988-11-01), Henniger
patent: 5048872 (1991-09-01), Gehring
patent: 5350204 (1994-09-01), Henniger
Reichard Dean A.
Sough Hyung S.
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