Fittings help novel knee brace take the strain
A
Lee Products product story
Edited by the Engineeringtalk editorial team
Mar 17, 2004
The ability to handle high pressures, light weight and flexibility were the essential requirements when the Penske company was sourcing components for its high-tech knee brace.
The ability to handle high pressures, light weight and flexibility were the essential requirements when the Penske company was sourcing components for its high-tech knee brace.
Clearly, the physical demands placed on the materials and components within such a product are unusual, if not unique.
The Lee Minstac system of tubing and fittings were chosen by Penske because of their ability to be flexible, yet strong enough to provide a leak-free performance, even under high pressure.
On one side of the knee brace is a cylinder which acts as a reservoir for the hydraulic fluid, and on the other side of the brace is another cylinder which acts as a damper to control the rate of movement of the knee joint.
The basis of the Minstac tubing connection system is a collet-lock device that allows the end of the Teflon tubing to be chamfered and then threaded into a specially designed collet.
This assembly provides a leak-proof connection from the Teflon tubing to the wide range of Minstac components and fittings, all without the problems associated with Teflon's cold flow characteristics.
The Penske knee brace features 156 Minstac fittings and Teflon tubing, which has an outside diameter of 3.96mm and uses a 0.25-28 UNF fitting end.
An internally threaded collet grips the outer diameter of the Teflon tubing end, preventing cold flow.
The chamfered end of the tubing is pressed against one end of the ferrule by the collet, while the other end is pressed against the sealing surface in the boss by a coupling screw.
Minstac tubing end connections are available in three standard outside diameter sizes - 1.57, 3.18 and 3.96mm - with one or two fitting ends installed to satisfy most fluid handling requirements.
Special lengths and fitting assembly tool kits are also available.
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Contact Lee Products
Tel +44 1753 886664
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