Bellows self-threading seal
First Claim
1. In a pump assembly for pumping fluent materials having a pumping chamber;
- an inlet to said pumping chamber;
an outlet for said pumping chamber;
a piston reciprocal in said pumping chamber; and
a piston rod on said piston, the improvement comprising;
a plurality of circumferential grooves on said piston rod;
an articulating movable seal having a pliant tubular end sealingly positioned on said piston rod over said plurality of circumferential grooves and a second end sealingly engaged with an end wall of an inlet chamber;
self-threading means threaded over said pliant tubular end of said articulating seal to deform said pliant tubular end into said plurality of grooves;
whereby said articulating movable seal is securely sealingly clamped on said piston rod.
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Accused Products
Abstract
A method and apparatus for improving a seal of a pliant tubular member on a cylindrical shaft. The seal is in the form of an articulating seal member positioned on a piston rod of a reciprocating pump and in this invention, is for use in a system that has dual in-line reciprocating pumps. The articulating seal has a tubular end positioned over circumferential grooves on each piston rod of the dual acting piston pump. To provide a tight, intimate seal relationship of the tubular end of the articulating seal with the piston rod, a self-threading member is threaded over the pliant tubular end to crush and deform the pliant tubular end into the circumferential grooves.
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Citations
13 Claims
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1. In a pump assembly for pumping fluent materials having a pumping chamber;
- an inlet to said pumping chamber;
an outlet for said pumping chamber;
a piston reciprocal in said pumping chamber; and
a piston rod on said piston, the improvement comprising;a plurality of circumferential grooves on said piston rod; an articulating movable seal having a pliant tubular end sealingly positioned on said piston rod over said plurality of circumferential grooves and a second end sealingly engaged with an end wall of an inlet chamber; self-threading means threaded over said pliant tubular end of said articulating seal to deform said pliant tubular end into said plurality of grooves; whereby said articulating movable seal is securely sealingly clamped on said piston rod. - View Dependent Claims (2, 3, 4)
- an inlet to said pumping chamber;
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5. A seal assembly for sealing a pliant tubular member on a cylindrical shaft comprising;
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a plurality of circumferential grooves on said cylindrical shaft; said pliant tubular member being positioned on said cylindrical shaft over said plurality of grooves; self-threading means threaded on said pliant tubular member, said self-threading means deforming said pliant tubular member into said plurality of grooves; whereby a tight, secure seal is formed between said pliant tubular member and said cylindrical shaft. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method of forming a seal on a cylindrical shaft comprising;
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cutting a plurality of circumferential grooves in said cylindrical shaft; positioning a pliant tubular member over said plurality of grooves; threading a self-threading member onto said cylindrical shaft over said pliant tubular member to deform said tubular member into said plurality of grooves. - View Dependent Claims (12, 13)
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Specification