Abstract:
An electrical connection of a terminal contact to an electrical conductor is crimped by applying compressive force to the right and left sides of the barrel of the contact but not at the center and not applying it directly toward the center, thus forming an "oblique" crimp. Such an oblique crimp can be formed using a punch die and an opposing anvil die each having a crimping surface with a central recessed relief area whereby the crimping surface does not compress the center of the contact barrel. On each side of the relief area is a substantial diagonal portion of the crimping surface, and outward therefrom is a transverse shoulder, both of which engage the contact barrel during crimping. This crimp is especially useful for contacts having closed or seamless barrel walls and also especially for crimping a slightly oversized barrel to a many-stranded conductor without an intermediate sleeve, and it is particularly useful where confined crimping is required. The use of only two opposing dies more economically and efficiently enables a fully automated feeding and terminating procedure; the dies can also be used in a manual crimping tool.
Abstract:
A contact terminal for insertion into a plated through-hole of a printed circuit board is formed from thin metal stock of uniform thickness with a tubular compliant mounting section. A plurality of spring vanes are spaced around the mounting section and extend tangentially outwardly to be deflected radially inwardly by the plated through-hole when inserted, to mechanically secure the terminal therein. Outer edges on the free ends of the spring vanes penetrate the plating material during insertion. A method for making such a terminal includes piercing the mounting portion area of the blank, forming slits therein, and rolling at least that portion into a tubular shape so that short tab-like metal portions extend tangentially outwardly to become the spring vanes.
Abstract:
An electric switch mounted within an enclosure having a hinged cover is manually operated from outside the enclosure by a handle mechanism secured to the enclosure. The cover is provided with a single aperture near the edge thereof remote from the cover hinges, with this aperture providing clearance for the operating handle and housing of the mechanism when the cover is closed and also providing clearance for a catch which holds the cover closed. A defeatable cover interlock prevents opening of the cover when the switch is closed, and a defeatable switch interlock prevents closing of the switch when the cover is open. The handle mechanism housing is provided with a front recess having a pivoted indicator member therein which is connected by a wire link to the cradle of the trip free contact operating mechanism. When the cradle is in its tripped position the indicator member is operated so as to be viewable through a transparent cover portion of the recess to indicate that opening of the switch resulted from fault conditions.