Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1996-09-16
1998-04-07
Cummings, Scott
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277227, 277DIG6, F16J 1516
Patent
active
057355282
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/SE93/01086 filed Dec. 17, 1993.
BACKGROUND OF THE INVENTION
The present invention relates to elastically deformable seals, and particularly to packing pieces for cable and/or pipe lead-throughs or bushings, wherein the seals are composed of material which possesses self-lubricating properties. The present invention also relates to such material and also to the use of such seals and materials.
By seals is meant Application mainly articles of deformable materials which are intended to be used in bushings, lead-throughs, throughlets and the like to seal cables, pipes and the like in walls and like structures against the through-passage of water, dust, flames, gas, pressure and explosions, for instance.
A cable or pipe bushing will normally include at least two packing pieces, which are most often comprised of elastically deformable material. When installing a bushing, it is necessary to grease or lubricate the packing pieces used in the bushing, partly to impart desired sealing properties to the bushing and partly to facilitate the actual process of installation.
Hitherto, the packing pieces have been greased by hand, the lubricant used to this end being delivered separately in a stick-like form, for instance. The lubricants are typically comprised of conventional greases or fats and lubricating greases such as Vaseline, .TM.Petroleum silicone fats, animal fats, etc.
As will be understood, the aforedescribed method of greasing packing pieces is a particularly time-consuming task. There is also a risk that some part of the packing piece will be left ungreased or will not be greased adequately enough, due to the human factor. The dependency on lubricants that are delivered in separate packages also has a number of drawbacks: The lubricant may be completely used-up before all packing pieces have been greased; it is necessary for the fitter to unpack the lubricant at the same time as he/she is engaged with fitting the actual bushing; and the use of separately packaged lubricants constitutes a load on the environment, etc.
SUMMARY OF THE INVENTION
An object of the present invention is to provide seals of the aforesaid kind, particularly seals in the form of packing pieces, which will assist in eliminating the aforesaid problems and drawbacks associated with the known technique, these problems and drawbacks having prevailed for many years.
Another object of the present invention is to provide a material from which the aforesaid seals can be formed, this material also assisting in avoiding the aforesaid drawbacks and problems.
Other objects of the present invention will be apparent from the following.
The aforesaid objects are achieved partly with the aid of elastically deformable seals in the form of so-called packing pieces or the like which are comprised of a material composition which is based on at least one type of elastomer, these seals being characterized in that there is included in the material composition 1-10 percent by weight, calculated on the total weight of the material composition, of a lubricant which in manufacturing the packing pieces or the like, is admixed substantially uniformly in the composition and which is chemically substantially non-combinable with the composition and which in use, migrates to the surface of the seal and therewith imparts self-lubricating properties to the surface of the seal, and partly with the aid of a material composition for forming the elastically deformable seals, the material composition including at least one type of elastomer and being characterized in that the composition includes 1-10 percent by weight, calculated on the total weight of the composition, of a lubricant which is chemically substantially non-combinable with the material composition.
By packing pieces is meant such elements as those which are intended to be fitted, preferably stationarily, in cable and pipe bushings or lead-throughs and to contribute therein towards a substantial part of the sealing properties of said bushings
REFERENCES:
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Tekniska nomenklaturcentralen, "Glossary of plastic and rubber terms," TNC 84, Nov. 15, 1986, pp. 142, 61.
"Plaster och deras anvandning inom industrin," (Plastic and their industrial uses) p. 62. Klaas Stoeckhert, Forum publ. Stockholm, 1955.
Patent Abstract of Japan, vol. 9, No. 192, C-296, abstract of JP,A,60-60141 (Nippon Oil Seal Kogyo K.K.) 6 Apr. 1985.
Cummings Scott
Lycab AB
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