Itw Limited

Neil P Blackburn

Alan M Meeks

John P Palmer

Alfred E Piper

A threaded member has an external helical thread 18a presenting a crest 24 of spiral outline whose trailing end is in the form of an abutment 26 for resisting withdrawal from a resiliently deformable workpiece. In a preferred application, the threaded member is a die-cast grub screw S and locates within a hinged plastics furniture fastener F. Advancing the grub screw S by 1/2-turn from its initial position in the fastener F breaks a frangible locating web 28 and allows the abutment 26 to pass an abrupt shoulder 64. This gives a tangible warning to the user that a ridge 12b on the grub screw S is correctly located beneath a head H of an anchor A.

Threaded members

A one-piece plastics moulding includes a pair of flaps 12a, 12b connected by a hinge 14. Both of the flaps 12a, 12b are slotted so that, when they are folded about the hinge 14 to their closed position, a pair of parallel bars 22, 24 is presented for use in adjustably securing a strap 20. Both of the flaps 12a, 12b have spikes 54, 56 for use in trapping a web-like workpiece 48. Any parts of the buckle 10 which touch, such as free ends of the spikes 56 located in complementary apertures 52, can be fixed together by ultrasonic welding, heat sealing or adhesive.

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Winchester, United Kingdom

Neil P Blackburn