JPS649697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a movable contact support device for a switch,
It is particularly suitable for small and inexpensive electromagnetic contactors.

Among conventional supports, those in which a protrusion 15 is provided at the center of the upper surface of the window 14 of the support 16 as shown in FIGS. 1 to 3 have the disadvantage that it is difficult to assemble the spring 13. Note that related devices of this type include, for example, Utility Model Publication No. 47-23021. In addition, as shown in Figures 4 to 6, the protrusion 17 provided near the opening on the top surface of the window is easy to install, but the structure of the mold for molding becomes complicated, increasing the cost of mold production and repair. Moreover, since the mold is formed by fitting the upper and lower (left and right) molds, it is necessary to divide the mold more than necessary for machining and polishing burrs, which makes the process complicated. The protrusions of each mold (indicated by a dashed line in FIG. 6) are thin and long, and there is a risk of breakage or deformation during molding.

The present invention eliminates the need for a jig when assembling a contact spring, and also simplifies the dividing surface of a molding die without impairing ease of assembling.

The window portion of the movable contact support inevitably becomes a portion where the top and bottom or left and right circles are butted against each other during molding. It is desirable that the mold abutment surfaces be on the same plane in view of ease of mold processing and polishing of burrs during repair.

Examples of the present invention will be described below.

A first embodiment is shown in FIGS. 7 to 9. Reference numeral 1 denotes a movable contact, which is inserted into the window 4 of the support 6 and attached to the bottom of the window 4. Reference numeral 5 designates a spring receiving protrusion that protrudes downward from the upper surface (ceiling surface) of the window portion 4, and has a prismatic side surface that bulges outward. It has a sloped surface 8 which slopes from both side hem portions 5a toward the cutting top portion 5c so as to be mid-height, and is curved and recessed in a valley shape. The four corner portions 5b (locking portions) of the protrusion 5 fall vertically from the upper surface of the window portion 4, and the radius of curvature formed by the corner portion 5b and the base portion 5a as shown in FIG. r ₁
(the arc is shown by a dashed-dotted line) is set so that it is larger (r ₁ > r ₂ ) than the inner radius r ₂ (the arc is shown by a dashed-double line) of the spring 3 that fits into it.

In the above configuration, how to attach the contact spring 3 will be explained. First, as shown in Fig. 1, the lower end of the spring 3 is fitted into the protrusion 12 of the movable contact, and then as shown in Fig. 12.
As shown in FIG. 13, the other end 3a of the spring 3 is brought into contact with the ceiling surface of the support body 6 and brought close to the base portion 5a of the protrusion 5 inside the window hole 4.

Next, a base portion 5a that protrudes from the end portion 3a of the spring 3
from the slope 8a to the slope 8a.
It is made to gradually approach the top portion 5c along the line a. At this time, since the spring 3 rises along the inclined surface 8a, the operation becomes smooth (see FIGS. 14 and 15).

When the end 3a of the spring 3 is further pushed from the state shown in FIGS. 14 and 15 and climbs over the top of the protrusion, it follows the slope 8b on the opposite side and reaches the base on the opposite side, and the spring 3 moves over the protrusion 5. surround the corner portion 5b of and fit into it. At this time, if the inner diameter of the spring 3 is made slightly smaller than the outer diameter of the corner portion 5b of the projection, the spring 3 will clamp the corner portion 5b.

After the assembly is completed as described above, even if an external force is applied to move the contact spring 3, the inner side 3b of the contact spring 3 is engaged with the corner portion 5b of the protrusion 5. It doesn't come off.

In other words, since this corner portion is almost perpendicular to the direction of penetration of the window hole 4, when the spring 3 is engaged, there is a risk of excessive pushing when assembling the contact spring 3, or vibrations after assembling.・It serves as an effective stopper to prevent the contact spring 3 from coming off due to impact. In addition, a vertical portion formed perpendicular to the inner surface of the window hole 4 is provided on the side surface of the protrusion 5 in a direction perpendicular to the insertion direction of the contact spring 3, and functions as a stopper in the direction perpendicular to the insertion direction of the spring 3. do.

A second embodiment of the present invention is shown in FIG.
The figure shows a third embodiment of the invention.

In the second embodiment, the protrusion 25 has a substantially square prism shape,
As in the first embodiment, there are sloped surfaces 28a and 28b on both sides of the window hole in the penetrating direction, and these sloped surfaces are concave in the shape of an angle.

In the third embodiment, the protrusion 35 has a substantially hexagonal prism shape,
Similar to the second embodiment, it has angularly recessed inclined surfaces 38a and 38b on both sides of the window hole in the penetrating direction.
In both the second and third embodiments, as shown in FIG. 18, the radius of curvature r ₁ formed by the corner portions (25b and 35b, respectively) is larger than the inner diameter r ₂ of the spring 3 (r ₁ > r ₂ ). corner part 25
b, 35b are formed vertically downward from the ceiling surface of the window hole. Also, the outer diameter between the corners is set to be slightly longer than the inner diameter of the spring 3.

The dividing plane of the mold for forming each protrusion formed as described above is shown by dashed lines in FIGS. 7 and 9 to 11. Therefore, as shown in FIG. 7, this mold has a shape in which the window 4 of the movable contact support 6 is divided into two in the opening direction, and the tip protrusion of the mold is different from the conventional one shown in FIG. Because it is thicker, it is stronger and less likely to deform or break the mold. In addition, since the dividing surface of the mold is a single line, burrs are less likely to form in this area, and even if they do occur, the burrs will form in a straight line across the inner surface of the window hole of the support and the spring receiving protrusion. Therefore, deburring work can be done from one direction, improving work efficiency.

As is clear from the above description, according to the present invention, the spring can be easily inserted along the slope, so the contact spring can be assembled into the window of the movable contact support very easily, and the locking The built-in spring can be prevented from easily coming off due to external force. Furthermore, the mold for forming the spring receiving protrusion has a simple shape, which is advantageous in terms of strength and cost.Furthermore, even if burrs occur, it is extremely easy to remove them.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a conventional example of a spring receiver device, Fig. 2
The figure is a cross-sectional view taken along line - in Fig. 1, Fig. 3 is a perspective view of the spring receiving protrusion, Fig. 4 is a front view of another conventional example, and Fig. 5 is taken along line - in Fig. 4. 6 is a cross-sectional view taken along the line ``-'' in FIG. 5, FIG. 8 is a vertical sectional view of the first embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along the line ``-'' in FIG. 8. Figure 9 is a perspective view of the spring receiving protrusion, Figure 10 is a perspective view of the second embodiment, Figure 11 is a perspective view of the third embodiment,
Figure 12 is a partially enlarged view of the contact spring before it is installed.
Figure 3 is a bottom view taken along the - line in Figure 12, and Figure 14.
The figure is a partial enlarged view of the contact spring in the middle of installation, Fig. 15 is a bottom view taken along the - line of Fig. 14, Fig. 16 is a partial enlarged view of the contact spring in the installed state, and Fig. 17 is a partial enlarged view of Fig. 16 -. Bottom view along the line, Figure 18 is the 3rd
FIG. 6 is an explanatory diagram showing the relationship between the inner diameter of the contact spring and the radius of curvature of the protrusion in the example. 1: Movable contact, 3: Contact spring, 4: Window hole,
5, 25, 35: Spring receiving projection, 6: Movable contact support, 8a, 8b, 28a, 28b, 38a,
38b: Slanted surface, 5b, 25b, 35b: Locking portion.

Claims (1)

[Claims] 1. Fit a movable contact into the window hole of the movable contact support, place a contact spring between the movable contact and the opposing inner surface of the window hole, and connect the movable contact to the window hole. In a spring receiving device for a switch configured such that a spring receiving projection is provided on at least one of the inner surfaces and the spring is inserted in a direction toward the center of the window hole, the spring receiving projection has a polygonal column shape. The side surface in the direction perpendicular to the insertion direction of the spring has a vertical portion formed perpendicular to the inner surface of the window hole, and the base portion is formed perpendicularly to the inner surface of the window hole in the insertion direction of the spring. It has an inclined surface having the same height and formed to have a middle height toward the center of the window hole, and a locking part formed perpendicularly to the inner surface of the window hole on both sides of the slope, and the locking part has A spring support device for a switch, characterized in that a radius of curvature formed by the stop portion and the base portion is set larger than an inner radius of the spring.