F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
F16B 7/00 (2006.01) B21D 39/04 (2006.01) B60N 2/68 (2006.01) F16B 17/00 (2006.01)
Patent
CA 2377160
A method and apparatus for interlocking at least one first tube having a first diameter with a second tube having a second diameter which is larger than the first diameter. The first tube is loaded over a mandrel having a punching end, and disposed into a holding block having a holding cavity conforming closely to the outer surface of the first tube. The second tube is disposed over a receiving block, which has a receiving cavity conforming closely to the outer surface of the first tube. The punching end of the mandrel is driven through the second tube and into the cavity in the receiving block, followed by the first tube. When the first tube reaches a lower limit of the receiving cavity, the first tube is compressed axially. The mandrel supports the interior of the first tube, the holding cavity prevents the trailing portion of the first tube from swelling outwardly, and the receiving cavity prevents the leading portion of the first tube from swelling outwardly. Thus, the portion of the first tube disposed inside the second tubular member swells under the axial compressive force, permanently interlocking the first tube with the second tube. The punching steps can be separated from the remaining steps of the method of the invention, or the second tube can be pre-punched.
Abel Joe
Skrepnek Andy
Dimock Stratton Llp
Summo Steel Corporation
LandOfFree
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