JPS5936388B2 - Blade holder spring - Google Patents

Description

[Detailed description of the invention] This invention relates to a blade holder spring for an electrical outlet.

Conventionally, in this type of plug, when the gap between the tongues is narrow, it is difficult to insert the plug blade, and when the gap is wide, the retaining force of the blade holder spring decreases, and the plug may come off from the outlet. In order to save material, the blade holder spring mouth supported only one side of the tongue piece A, and in order to increase the holding force, a separate process was required to bring the tips closer together as shown in Figure 1, which also resulted in excessive bending. In some cases, the plug blade C may come into contact with a narrow part of the gap S, as shown in FIG. 2c, making it difficult to insert the plug. This invention was made in view of the above-mentioned circumstances, and its purpose is to allow the tips to be brought close to each other when forming the blade retaining spring without requiring a separate process, and to provide a large holding force. To provide a blade holder spring.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 4c.

Reference numeral 1 denotes a blade receiving spring, which is formed by bending both ends of a terminal portion 4 for connecting an electric wire (not shown) corresponding to the locking piece 3 of the locking spring 2, and a support for supporting the locking spring 2. It consists of a hanging piece 6 formed by cutting and raising the portion 5 alternately from the left and right sides, and a pair of tongue pieces Ba and 8b formed at both ends of this hanging piece 6 via a U-shaped connecting piece T. , 8b bends the lower end A in parallel to bring the tongues Ba and 8b closer to each other, and then bends them at an inclination θ relative to the lower end A to form a contact portion 10 that presses the plug blade 9; By forming the contact portion 10 in a trapezoidal shape, the gap S between the contact portions 10, 10 becomes gradually narrower toward the tip, as shown in FIG.

Reference numeral 12 denotes a bridging piece between the connecting pieces T.

As shown in FIG. 4a, when inserting the plug blade 9, first insert the plug blade 9 into the contact portion 10 with the widest gap S.
As shown in Fig. 4c, gradually insert the
The retaining force of the blade receiving spring 1 is provided by the springiness of the narrow contact portion 10.

As explained above, the present invention comprises bending the lower ends of a pair of tongues forming a blade retaining spring in parallel to bring them close to the other tongue, and then bending them at an angle of θ with respect to the lower ends. The upper side is bent parallel to form a trapezoidal contact portion that presses the plug blade, and the gap between the contact portions is gradually narrowed toward the end, thereby forming the blade receiving spring 1. When doing so, the tips between the contact portions 10, 10 can be successively narrowed, and a blade receiving spring with a large holding force can be obtained.

[Brief explanation of the drawing]

Figures 1 to 2c show a conventional example; Figure 1 is a perspective view;
FIG. 2a is a plan view of the portion, and FIGS. 2b and 2c are enlarged views of the main parts showing the inserted state of the plug blade. Figures 3 to 4c show one embodiment of the present invention;
The figure is a perspective view, and FIG. 4a, FIG. 4b, and FIG. 4c are enlarged views of main parts showing the inserted state of the plug blade. 1...
・Blade holder spring, 2...Lock spring, 3...
Locking end, 4...Terminal part, 5...Support part, 6...Descent piece, T...Connecting piece, 8
a, 8b... tongue piece, 9... plug blade, 10... contact part, 11... guide part,
12...Bridging piece, A...Lower end, θ・
... Slope, S ... Gap.

Claims (1)

[Claims] 1. The lower ends of the pair of tongues forming the blade retaining spring are bent parallel to each other, brought close to the other tongue, and then bent at an angle of θ with respect to the lower end, and the upper sides are bent parallel. 1. A blade receiving spring characterized in that the contact portions for press-contacting the plug blade are formed into a trapezoid shape so that the gaps between the contact portions are gradually narrowed toward the ends.