Formation of blind hole, etc. in thermoplastic electrical junction box, etc., includes forming thinner zone of constant thickness, plastifying zone by heating and shaping zone with die or punch

摘要

Formation of a mechanically weakened section in of thermoplastic article includes forming a hollow in a zone of constant thickness, making the zone plastic using a heating probe and using a punch or die to form a hole or a start of a hole in the plastified zone. Independent claims are included for the following: (a) profiled plastic article produced as above; and (b) a junction box, etc. for electric cabling, has a plinth with a profiled section as in (a) and a cover.