Sleeves
AssigneeFisons Limited
InventorGeorge Raymond Cowie
Life of this patent
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Abstract
An improved open ended frusto conical sleeve member suitable for use as a sealing interface between the co-operating mating surfaces of a tapered male/female push fit type glassware joint is disclosed. The sleeve member, which has a wall thickness of less than 1.5 mm includes at least two integral, generally circumferential ribs and an external annular flange for gripping during assembly and disassembly of a joint incorporating the sleeve member. The sleeve member, the ribs and the annular flange are constructed from a material having a static coefficient of friction of less than 0.2, a hardness of from 50 to 80 on the Shore D scale, and which is resistant to thermal degradation up to 200.degree.C and to structural degradation when immersed in a corrosive chemical for 12 hours at 50.degree.C.
Claims9
In an open ended conical sleeve member having a wall thickness of from 0.1 to 1.5 mm and suitable for use as a sealing interface between the co-operating mating surfaces of a tapered male/female push fit type glassware joint, the improvements which comprise:
- said sleeve having a substantially smooth exterior surface;
- at least two generally circumferential ribs integral with the interior surface of said sleeve member;
- an external integral annular flange positioned at the broader end of said sleeve member and extending radially outwardly therefrom, whereby said sleeve member may be gripped during assembly and dismantling of a joint incorporating the sleeve member;
- said sleeve member, said generally circumferential ribs and said annular flange being constructed from a material having a static coefficient of friction of less than 0.2, having a modulus of elasticity in the range of 80 .times. 10.sup.3 to 200 .times. 10.sup.3 at 23.degree.C, having a hardness as measured on the Shore D scale of from 50 to 80, being resistant to thermal degradation at temperatures up to 200.degree.C and being resistant to structural degradation when immersed in a corrosive chemical for a period of 12 hours at 50.degree.C.
Dependencies are inferred from the claim text.