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US 3,972,112 AGranted
Method and apparatus for forming tube coupling joint
AssigneeParker-Hannifin Corporation
InventorsLawrence B. O'Sickey, Jerry V. Koski
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AssigneeParker-Hannifin Corporation
InventorsLawrence B. O'Sickey, Jerry V. Koski
Estimating the term…
A tube coupling joint comprising a tube having an enlarged end, a body having a bore to receive the tube end and having a cam surface leading to the bore, a sleeve having an inner end with a transverse shoulder contracted to a diameter less than the tube diameter with the sleeve shoulder embedded within the tube adjacent the expanded portion of the tube, and a nut holding the sleeve into engagement with the cam surface whereby the cam surface maintains the sleeve shoulder in its embedded position. The method of forming the joint includes the use of an apparatus wherein the sleeve is held in a fixed position relative to the tube and spaced from the end of the tube while the tube end is being expanded, moving a punch into the tube to expand the end thereof, and then axially moving the tube relative to the sleeve while a die member having a camming surface thereon radially contracts the end of the sleeve to a diameter less than the initial diameter of the tube whereby a shoulder on the sleeve cuts its way into the wall of the tube to become embedded therein closely adjacent the expanded end of the tube.
The method of mounting a sleeve on a tube of predetermined diameter wherein the sleeve has a contractible portion at one end thereof provided with a generally transverse shoulder and wherein said transverse shoulder has an initial inside diameter no smaller than said predetermined diameter, said method comprising telescoping the sleeve over the tube to a fixed axial position relative to the tube and in which position said shoulder faces toward one end of the tube and is axially spaced therefrom, holding the tube and sleeve in said fixed position relative to each other, expanding said end of the tube to a diameter larger than said sleeve shoulder initial diameter, then contracting said sleeve portion to reduce the inside diameter of said sleeve shoulder to cause said sleeve shoulder to engage said tube immediately adjacent said expanded portion.
Apparatus for mounting a sleeve upon a tube of predetermined diameter wherein the sleeve has a contractible portion at one end thereof provided with a generally transverse shoulder that has an initial inside diameter no smaller than said predetermined diameter, said apparatus including a first means for holding the sleeve and tube in a fixed axial position relative to each other with the sleeve shoulder axially spaced from one end of the tube, second means for expanding said end of the tube, and third means for contracting said sleeve contractible portion to reduce the inside diameter of said sleeve shoulder.
Dependencies are inferred from the claim text.