Importance

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Abstract

A fitting for retaining a cylindrical tube includes a fitting body having a hole extending through it. The hole includes a cylindrical main cavity located at one end of the body into which an end of the tubing can be inserted. A circular retaining shoulder is located on the tubing so that the shoulder is within the main cavity when the tubing is placed in the fitting. A closure, such as a snap ring, is installed at the open end of the main cavity to hold the shoulder within the main cavity. The closure has a circular hole within it to receive the tubing. An elastomeric seal is mounted within the main cavity between the shoulder and the closure. The inner diameter and the outer diameter of the seal cause the seal to be compressed between the tubing and the wall of the main cavity. A preselected shoulder clearance gap is formed between the retaining shoulder and the main cavity, a preselected closure clearance gap is formed between the tubing and a hole in the closure, and an axial gap is formed within the axial length of the main cavity so that the shoulder can move freely within the main cavity as a result of these gaps while being retained within the cavity so as to minimize fatigue on the tubing while the tubing is being retained by the fitting.

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First Claim