Thermoplastic article having accessible wall cavities...

F - Mech Eng,Light,Heat,Weapons – 16 – B

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F16B 37/12 (2006.01) E03F 5/04 (2006.01) F16B 37/04 (2006.01)

Patent

CA 1107994

ABSTRACT A nut retaining formation is made in the wall of a thermoplastic (metal or plastic) article, such as the flange of a floor drain fitting, by a one step die forming operation. The formation has a cavity within the thickness of the flange, the height of the cavity being such that a screw threaded apertured nut is a close sliding fit therein. A sloping recess provides access to the cavity from the top surface of the flange at one side thereof, the nut being slidable down the recess into the cavity. An aperture through the top surface provides access for a bolt shank to be inserted into the cavity to engage the nut positioned therein. The top and botton walls of the cavity are formed by discontinuous nut retaining formations in the top part and bottom part of the wall thickness, surrounding the aperture. The formations in the top part of the wall thickness align vertically with gaps or separations between the nut retaining formations in the bottom part of the wall thickness, and the nut retaining formations in the bottom part of the wall thickness align vertically with gaps or separations between the nut retaining formations in the top part of the wall thickness. By this means, the formations, the recess and the nut receiving cavity can be stamped in the wall by a one step pressing operation between a pair of co-operating dies, approaching from above and below the wall.

301501

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