JPS6222066Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrical contact receptacle for receiving a flat blade contact, and more particularly, to British patent no.
of the type disclosed in No. 28306/78 (application number 28306/78);
The present invention relates to an electrical contact receptacle connected to a flat blade fuse.

Fuses of this type are used in automobiles, particularly in the United States, and are increasingly being used in automobiles produced in Japan and Europe. As a technical requirement, the fuse must be able to withstand the rated circuit current and break at no transient overload current. Blade fuses of this type have been found to be satisfactory, especially for rated currents up to 30A, but provide an electrical contact receptacle that maintains a satisfactory releasable electrical connection without adversely affecting the fuse characteristics. There were considerable difficulties. Many known receptacles that are easy to manufacture at a reasonable cost exhibit contact resistance such that the heat generated at the contact interface between the contact receptacle and the fuse adversely affects the characteristics of the fuse and its susceptibility to blowing at its rated current. .

It is customary for fuses of this type to be mounted in a junction box to which the operating circuits are interconnected, the circuits within the box being constructed by flat conductive strips mounted on an insulating layer. The substantially rigid ends of the conductive strips are bent out of the plane of the insulating layer and extend out of the box for external connection, such as to a fuse.

The ends of such conductive strips can be formed into conventional blade receptacles by suitable stamping operations, but the desired metal thickness for obtaining adequate performance in the receptacle is determined by the thickness of the metal on the insulating layer. The thickness is excessive compared to the thickness required to provide the circuit portion with its current capacity.

It is an object of the present invention to provide an electrical contact receptacle for flat blades which can meet the operating requirements in an advanced manner when used with flat blade fuses.

An electrical contact receptacle for a flat blade according to the present invention comprises a metal spring clip attached to a generally flat metal tab, characterized in that the spring clip is formed from a strip-like member and is attached to each side near one end. a pair of wing-like lateral extensions, one each, which extensions are folded back with inwardly bent edges facing one side of the strip-like member to provide a receptacle portion for the tab; A strip-like spring extending from the section in the direction of the free end of the tab first moves away from one side of the tab approximately at right angles and then approaches that tab side obliquely to a contact zone on the tab side where it becomes convex towards the tab side. It curves away from the tab and widens towards the end.

The spring clip is suitably attached to the tab by engaging a boss formed in the tab surface with a hole in the receptacle portion opposite the inwardly bent edge.

It is also suitable for the spring clip to be bifurcated at its end opposite the receptacle part by a split groove starting at its free end and extending towards a part substantially perpendicularly away from the tab surface.

Furthermore, each of the bifurcated spring parts is formed with a contact protrusion facing the tab by pressing into the convexly curved part, the tab extending from the contact zone towards the receptacle part, about a third of the width of the tab. A width of
It is appropriate that the recess is formed in the center.

Suitably, the tab is reduced in width at its free end and extends obliquely away from the spring end to present a diverging entrance to the mating blade. Suitably, the width of the reduced width tab portion is less than the mutual spacing of the inwardly bent edges of the receptacle portion to facilitate assembly of the spring clip onto the tab. It is also suitable that the end of the inwardly bent edge remote from the contact zone is beveled, and the receptacle part is pressed into the center of the bottom opposite to this beveled part. This facilitates insertion of the tab into the receptacle portion and entry of the tab boss into the hole in the bottom of the receptacle portion.

Next, embodiments of the present invention shown in the drawings will be described.

The electrical contact receptacle of FIGS. 1-4 includes a generally flat tab 1 of conductive metal, such as brass or copper, to which is attached a spring clip 2 of metal, such as steel or phosphor bronze. The spring clip 2 has a generally strip-like configuration and has a receptacle portion 3 at its lower end from which a spring portion 4 extends. The receptacle portion 3 is constituted by a pair of wing-like extensions 5 extending one from each side of the strip-like portion, and both wing-like extensions are folded back to the same side to form respective side edges 6. is opposite one side of the strip-like portion forming the base of the receptacle portion 3.

The tab 1 is pressed in and has a boss 7 on one side which engages a hole 8 in the base of the receptacle to secure the spring clip to the tab.

The lower ends of both side edges 6 of the receptacle are beveled 9 to facilitate the entry of the tab 1 into the receptacle part 3 from the lower end, and the base of the receptacle part is provided with an indentation 10 at its end to facilitate access to this receptacle end. The entrance to Boss 7 has been made larger.

The strip-like part 4 extending above the receptacle part 3 first moves away from the tab 1 at an approximately right angle and then bends and approaches the tab 1 obliquely upwards until it reaches the contact zone 11 . Here, this spring portion 4 is curved convexly toward the tab side, and widens away from the tab.
and the tab 1 defines a diverging entrance through which a mating blade (not shown) enters the contact zone 11 .

The spring part 4 is bifurcated from its free or upper end by a split groove 12 which reaches approximately the midpoint between the contact zone 11 and the part which runs away from the tab at approximately right angles. In the contact zone 11, an indentation 13 is applied to the bifurcated convex curved portion to define a contact projection protruding toward the tab 1 side.

The tab 1 is indented in its central part and defines on the side of the spring part 4 a recess 14 extending from the contact zone 11 down to the receptacle part. This push-in facilitates assembly so that the width of the tab 1 on the side opposite the spring section 4 is smaller than the mutual spacing of the inwardly bent edges 6 of the receptacle section.

Above the recess 14 , the tab reduces in width to form a central tab section 15 , whose width is also smaller than the mutual spacing of the edge sections 6 and which extends obliquely away from the spring section 4 . It helps define a widening insertion opening for the mating blade.

As seen in Figure 5, the receptacles of Figures 1-4 are electrically conductive, mounted on a circuit board layer 17 forming part of a junction box assembly of the general type described, for example, in British Patent No. 2022333. A strip 16 can be arranged on the tab 1 which is bent upwards.

When assembling the spring clip 2 to the tab 1, the free end of the tab is engaged with the lower end of the receptacle part 3;
The receptacle portion is forced along the tab until the boss 7 engages the hole 8 under the spring action of the inwardly bent edge 6. In this state, the spring portion 4 is preferably deflected by engagement with the tab, so that the spring is preloaded before the mating blade is inserted.

Alternatively, the receptacles of FIGS. 1-4 may be provided with crimp ferrules for connecting conductors. To do this, it is sufficient to stamp the tab 1 to form a U-shaped ferrule that is crimped onto the conductor.
By integrally bonding the ferrule to a carrier strip common to a series of receptacles, the receptacles can be handled in strip form and applied to conductors by automatic or semi-automatic wire termination equipment.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional elevation view of the electrical contact receptacle of the present invention, FIGS. 2 and 3 are elevational views seen from the left and right sides of FIG. 1, respectively, and FIG. 4 is a view of FIGS. FIG. 5 is a cutaway perspective view of the receptacle of the present invention constructed on a conductive strip bent out from a layered circuit structure used in a junction box. 1...Tab, 2...Spring clip, 3...Receptacle part, 4...Spring part (strip-like spring),
5... Lateral extension portion, 6... Inward bent edge, 7...
Boss, 8...hole, 9...beveled end, 10...push, 11...contact zone, 12...split groove, 13...
Push-in, 14... Recess, 16... Conductive strip, 17
...Circuit board layer.

Claims (1)

[Claims for Utility Model Registration] (1) An electric contact receptacle for a flat blade, which comprises a metal spring clip attached to a substantially flat metal tab, and receives a flat blade between the clip and the tab, A spring clip 2 is formed from a strip-like member and has a pair of wing-like extensions 5 near one end, which extensions 5 are folded back with an inwardly bent edge 6 facing one side of said strip-like member. and insert the receptacle part 3 into the tab 1.
and from the receptacle portion 3 to the tab 1
A strip-like spring 4 extending in the direction of the free end of said tab 1 first moves away from one side of said tab 1 at an approximately right angle and then approaches said tab face obliquely to reach a contact zone 11 on said tab face where it reaches said tab 1 side. An electrical contact receptacle characterized in that it is curved in a convex shape and widens away from the tab 1. (2) The utility model registration claim is characterized in that the spring clip 2 is attached to the tab 1 by engaging the hole 8 of the receptacle part 3 with the boss 7 formed on the tab surface. An electrical contact receptacle according to scope 1. (3) A claim for registration of a utility model, characterized in that said strip-like spring 4 is bifurcated by a split groove 12 that starts at its free end and extends toward a part that goes away from said tab 1 at an approximately right angle. An electrical contact receptacle according to scope 1. (4) Both of the bifurcated spring parts are formed with a contact protrusion facing the tab 1 by an indentation 13 in the convex curved part, and the tab 1 is formed in the contact zone 11.
The electric contact according to claim 3 of the utility model registration claim, characterized in that a recess 14 having a width of about one-third of the tab width is formed in the central part and extends from the center toward the receptacle portion 3. receptacle. (5) said tab 1 is reduced in width at its free end to define a central tab portion 15;
5 defines a diverging inlet obliquely away from the spring end, and the width of the tab portion 15 is smaller than the mutual spacing of the inwardly bent edges 6. An electrical contact receptacle according to scope 1. (6) One end 9 of the inwardly bent edge 6 is obliquely cut, and the receptacle portion 3 is placed opposite the obliquely cut portion 9.
The electric contact receptacle according to claim 5, wherein the electric contact receptacle is pressed into the center of the bottom.