JPH0239317Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a single-throw circuit type seesaw switch that turns an electric circuit ON/OFF using a contact plate that operates as a seesaw.

[Prior art and its problems]

An outline of a conventional single-throw circuit type seesaw switch will be explained with reference to FIG. 1 (perspective view) and FIG. 2 (longitudinal sectional view).

In the figure, the contact plate 6 is pressed against the switch case 3, and the circuit is turned off. An operating member 2 of this single-throw circuit type seesaw switch 1 is rotatably supported on a switch case 3.
When an external force is applied to the operating member 2 in the clockwise direction (in the direction of the arrow in FIG. 2), the operating member 2 pivots about the pivot point P. Then, this operating member 2
A rod 5 is attached to the lower end of the rod via a compression spring 4.
The spherical tip presses and slides on the contact plate 6. Then, this contact plate 6 rotates counterclockwise (in the direction of the arrow) around the central part placed on the support terminal 7.
pivot to. A contact 6b fixed to one end of the contact plate 6 comes into contact with a contact 8a on a fixed terminal 8 provided inside the switch case 3. As a result, the support terminal 7 and the fixed terminal 8 are brought into conduction via the contact plate 6, and the switch is turned on in a predetermined manner (the state shown in FIG. 3a). In addition, the code|symbol 9 is a protrusion which partitions between the terminals 7 and 8.

Incidentally, FIGS. 3b to 3d show cross-sectional views of the case where the contact plate 6 is incorrectly attached during the assembling work of the seesaw switch. 3rd b
In the figure, when the contact plate 6 is installed with the left and right reversed,
In the figure, when the contact plate 6 is installed upside down,
FIG. 3d shows a case where the contact plate 6 is installed with the left and right sides reversed. If the product is assembled in this state, the switch will operate and the contact will be turned on during a subsequent product inspection, resulting in the problem that abnormalities cannot be detected. In addition, in the case of the contact plate 6 that is incorrectly attached as shown in FIGS. 3b to 3d above, a portion other than the contact 6b (for example, the tip of the contact plate 6) may come into contact with the contact 8a of the fixed terminal 8. Leave. Therefore, contact resistance is large, and arcing occurs when the switch is turned on and off. As a result, the contact portion of the contact plate 6 and the contact 8a are welded together by the arc heat, resulting in the inconvenience that the switch cannot function as a switch.

To deal with this, a contact plate 20 as shown in FIG. 4a has been devised. At one end of this contact plate 20, a contact 6b opposite to the contact 8a of the fixed terminal 8 is fixed as described above, and the other end is folded back to the back side, and the tip of the folded portion 20a is near the support terminal 7. It extends to FIG. 4a shows a case where the contact plate 20 is installed in a normal state. In this case, when the operating member 2 is rotated clockwise, the contact plate 20 is pressed by the rod 5 attached to the tip and rotated, thereby connecting the contacts 6b and 8a. In addition, in the case of incorrect installation, that is, the fourth
If the contact plate 20 is installed with the left and right sides reversed as shown in Figure b, the folded portion 20a of the contact plate 20
comes into contact with the partition protrusion 9 and no longer rotates. Therefore, not only can an abnormality be detected when operating a switch, but also during a continuity test.
Since it is not turned on, an abnormality is detected. Also, the fourth
If the contact plate 20 is installed in an inverted state as shown in Figure c, the tip of the rod 5 will not touch the contact plate 20 when the operating member 2 is turned OFF (swiveled in the counterclockwise direction). It is hooked to the tip of the folded portion 20a. Therefore, the operating member 2 cannot return to its normal state, and it is easy to detect that it is abnormal.Furthermore, as shown in FIG. In this case, when the operating member 2 is rotated clockwise to turn ON, the rod 5 at the tip is hooked to the tip of the folded portion 20a of the contact plate 20, so the operating member 2 does not operate normally. do not. Therefore, in this case as well, it can be easily determined that there is an abnormality.
Additionally, abnormalities can be detected during continuity testing. However, this structure has the disadvantage that the contact plate 20 has a folded portion 20a, which complicates the shape, increases the number of manufacturing steps, and increases the product cost.

[Purpose of this invention]

The present invention has been made in view of the above-mentioned conventional problems, and aims to provide a single-throw circuit type seesaw switch that has a contact plate with a simple shape, can be manufactured at low cost, and can easily detect incorrect assembly. The purpose is

[Structure of the present invention]

The single-throw circuit type seesaw switch according to this invention is
A support terminal is provided in the case, and a fixed terminal is provided on one side of the support terminal and a protrusion is provided on the other side, and the above-mentioned one is provided at one end of the contact plate whose midway portion is supported by the support terminal. A contact point facing the fixed terminal is fixedly installed, and a hole is formed at the other end through which the protrusion is inserted, and the contact plate has a pressing surface that slopes upward from the middle part toward both ends. is formed, an operating member is in sliding contact with this pressing surface, and a protrusion is provided in the case opposite to the lower side of the pressing surface.

By configuring the single-throw circuit type seesaw switch in this manner, the contacts fixed to the contact plate will ride on the protrusions when the contact plate is installed with the right and left sides reversed. If the switch is turned off using the operating member in this state, the feel of the off operation will be different from that in the normal assembled state, making it easy to identify incorrect assembly.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to FIG. 5 and the following drawings.

Figure 5 is a longitudinal sectional view of the single-throw circuit type seesaw switch, Figure 6 is a perspective view showing the contact plate and the bottom of the switch case, and Figure 7a is a cross-section of the single-throw circuit type seesaw switch showing the operating state of the contact plate. Figure, Figure 7b~
FIG. 7d is a cross-sectional view of the single-throw circuit type seesaw switch showing a state in which the contact plate is incorrectly attached.

(Configuration of Embodiment) Reference numeral 1a in the figure is a single-throw circuit type seesaw switch. A partition wall 10 is provided on the bottom surface of the switch case 3 of the seesaw switch 1a to protrude along the longitudinal direction.
A pair of terminal groups is provided. This terminal group includes a support terminal 7 and a fixed terminal 8 on one side of this support terminal 7.
It is made up of. The support terminal 7 protrudes into the switch case 3, and has a notch 7a at its upper end.
is formed (see Figure 6). Further, the fixed terminal 8 is bent into an L shape inside the switch case 3, and a contact point 8a is fixed to the bent surface 8b. In addition, the support terminal 7 inside the switch case 3
A receiving part 21 is located on the opposite side of the fixed terminal 8 across the
is provided. This receiving part 21 has a rib 22 protruding from the bottom of the switch case 3, and
2 and a pin 23 erected on top of the pin 23. Further, the notch 7a of the support terminal 7 is located above the contact 8a in the drawing, and the receiving portion 21 is at approximately the same height as the support terminal 7. In addition, the support terminal 7, the fixed terminal 8 and the receiving part 21 inside the switch case 3
A partition plate 11 is erected between the two. This partition plate 11 is formed integrally with the switch case 3, and has an acute-angled protrusion 11a formed at its tip. Partition plate 11 including this protrusion 11a
The height ha is set lower than the height H of the support terminal 7.

Further, reference numeral 12 is a contact plate. This contact plate 1
A notch 12a is formed on both sides of the center of the support terminal 7, and this notch 12a is connected to the notch 7 of the support terminal 7.
A is equipped as a plaything. Further, both ends of the contact plate 12 are bent obliquely upward in the drawing. Holes 12d are bored at both ends. Further, one of the holes 12d has a contact 6 opposite to the contact 8a.
b is fixedly provided, and the other hole 12d is opposed to the pin 23 of the receiving portion 21. Also, this contact plate 1
2 has a pressing surface 12b formed in a curved shape and inclined obliquely upward from the center toward both ends (the height of the pressing surface 12b is indicated by h). Furthermore, the tip portions 12c of both pressing surfaces 12b are located above the protrusion 11a.

On the other hand, a frame 13 is attached to the upper surface of the switch case 3. Arms 14a projecting from both sides of the operating member 14 are pivotally supported by brackets (not shown) provided on the frame 13. The operating member 14 has a T-shaped cross section, and the arm 14a includes a grip portion 14b extending in the horizontal direction;
It is provided at the intersection with the operating rod 14c extending in the vertical direction. A hole 14d of a predetermined depth is bored at the tip of the operating rod 14c, and a rod 17 is attached to this hole 14d via a compression spring 16 so as to be freely retractable. A hemispherical slider 17a formed at the end of this rod 17 is attached to the contact plate 12.
It is slidably pressed onto the pressing surface 12b of.
Further, the knob portion 14b includes a seesaw cap 1.
5 is snapped in.

(Operation of the embodiment) Next, the operation of the embodiment with the above configuration will be explained.

FIG. 5 shows a state in which the contacts 6b and 8a are open (OFF state). At this time, the hole 12d drilled at the other end of the contact plate 12 is inserted into the pin 23 provided in the receiving part 21 of the switch case 3, and the rib 2 is inserted into the hole 12d.
It is hung on 2. When a force F is applied to one side of the seesaw cap 15 in the state shown in the figure, the operating member 1
4 pivots in one direction (clockwise in the drawing) around the arm 14a. Therefore, the operating rod 14c of the operating member 14 also pivots at the same time, and the slider 17a of the rod 17 attached to the hole 14d of the operating rod 14c via the compression spring 16 presses one side of the contact plate 12. The pressing point is transferred from the surface 12b to the other pressing surface 12b. Then, the contact plate 12 pivots counterclockwise around the notch 12a loosely fitted in the notch 7a of the support terminal 7. When the lower end of the knob 14b of the operating member 14 comes into contact with the frame 13 and its rotation stops, the contact 6b fixed to the end of the contact plate 12 is pressed against the contact 8a of the fixed terminal 8. (Situation in Figure 7a). This pressing force is due to both the pressing force of the compression spring 16 and the force due to elastic deformation of the pressing surface 12b itself. the result,
The support terminal 7 and the fixed terminal 8 are electrically connected via the contact plate 12. At this time, the protrusion 11a on the partition plate 11 faces into the relief hole of the part formed by cutting and raising the pressing surface 12b of the contact plate 12, and the pressing surface 1
The tip 12c of the protrusion 2b does not touch the protrusion 11a but faces above it.

By the way, when assembling the seesaw switch 1a, if the contact plate 12 is placed on the support terminal 7 with the left and right sides reversed as shown in FIG. 7b, the contact 6b fixed to one end of the contact plate 12 is the receiving part 21
It rides on pin 23 of. In this state, when the operating rod 14c of the operating member 14 is turned OFF (swiveled counterclockwise), the pressing surface 12b of the contact plate 12
The tip 17a of the rod 17 will apply an abnormal load to the rod 17. As a result, the operating member 14 feels heavy, and it is determined that the operating member 14 is incorrectly attached.

Further, as shown in FIG. 7c, when the contact plate 12 is assembled in an upside-down state, the tips 12c of both pressing surfaces 12b formed on the contact plate 12 are placed on the projections 11a on the partition plate 11. It is latched. Therefore, even if the operating rod 14c of the operating member 14 rotates back and forth, the contact plate 12 does not rotate and the switch is turned ON.
Since it does not operate, it can be easily determined that the assembly is defective based on the feel when operating the operating member 14 and an electrical continuity test.

Further, as shown in FIG. 7d, when the contact plate 12 is assembled with the left and right sides reversed and the top and bottom turned upside down, the contact 6 fixed to one end of the contact plate 12
The back surface of b is hooked onto the pin 23 of the receiving part 21, and the tip 12c of the pressing surface 12b located on the opposite side from the contact point 6b is engaged with the protrusion 11 on the partition plate 11.
It is hung on a. Therefore, even if the operating rod 14c of the operating member 14 is rotated back and forth, the contact plate 12 does not rotate. Therefore, not only can it be easily determined that the operating member 14 has been installed incorrectly by the feel when operating it, but also an assembly defect can be quickly detected during an electrical continuity test since the contact does not turn ON.

(Modification) Also, in the figure, the notch 12 of the contact plate 12
Although the notch 12a is formed at the center of the contact plate 12, if the notch 12a is formed at an eccentric position on either the left or right side, it is possible to prevent the contact plate 12 from being incorrectly installed in the opposite direction.

[Effects of this invention]

As described above, according to the present invention, the following effects can be achieved.

(1) The contact plate is formed with a pressing surface that slopes upward from a midway position toward both ends, and an operating member is connected to this pressing surface. Since the protrusion is provided, when the contact plate is installed upside down, the pressing surface will come into contact with the protrusion, and the contact plate and the fixed terminal will not come into contact with each other. Therefore, assembly defects can be easily detected by testing continuity between the terminals after assembly or by feeling the operating member.

(2) In addition, a fixed terminal is provided on one side of the support terminal in the case, a protrusion is provided on the other side, a contact opposite to the fixed terminal is fixed on one end of the contact plate, and a switch is provided on the other end. Since we have formed a hole through which the protrusion is inserted when the contact plate is turned off, if the contact plate is installed with the left and right sides reversed, the contact fixed to one end of the contact plate will ride on the protrusion and the operating member will The OFF operation feels heavier than normal operation. Misassembly can be easily determined by the feel of this switch operation.

(3) Furthermore, if the contact plate is installed with the left and right sides reversed and in an upside-down state, the back surface of the contact fixed to the contact plate will ride on the above protrusion, and the pressing surface on the side opposite to this contact will comes into contact with the protrusion. Therefore, in this case as well, since the feeling when operating the operating member is different from that in the normal assembled state, it is not only possible to distinguish, but also easily detected by conducting a continuity test between the terminals.

(4) From the above, in the seesaw switch according to the present invention, all the assemblies of the contact plate can be detected by feeling the operating member or by testing electrical continuity.

(5) Therefore, no defective products will be shipped, and the seesaw switch according to the present invention is guaranteed to be safe and of high quality, and the reliability of the product is greatly improved.

(6) Furthermore, since the contact plate does not have a folded part like the conventional one and has a simple shape, manufacturing is easy and product cost can be reduced.

[Brief explanation of drawings]

Figures 1 to 4d show conventional examples,
FIG. 1 is a perspective view of the seesaw switch, FIG. 2 is a vertical sectional view thereof, FIGS. 3a to 3d are sectional views of essential parts of the seesaw switch showing the assembled state of the contact plate for each aspect, and FIG. Figure 3a shows a normal assembled state, and Figures 3b to 3d show incorrectly assembled states. Figures 4a to 4d are sectional views of the main parts of the seesaw switch showing the assembled states of other contact plates in each aspect, and Figure 4a shows the normal assembled state;
Figures 4b to 4d show incorrect assembly. Figure 5 and subsequent figures show embodiments of the present invention, with Figure 5 being a longitudinal sectional view of the seesaw switch, and Figure 6 being a longitudinal sectional view of the seesaw switch.
The figure is a partial cross-sectional perspective view showing the contact plate and the bottom of the case, Figure 7a is a cross-sectional view of the main parts of the seesaw switch showing the state in which the contact plate is normally assembled, and Figures 7b to 7d are the contact plate and the bottom of the case. FIG. 3 is a sectional view of a main part of the seesaw switch showing various aspects of the incorrectly assembled state. 1a...Single-throw circuit type seesaw switch, 3...
Case, 6a... Contact, 7... Support terminal, 8...
Fixed terminal, 8a...Fixed contact, 11...Protrusion, 1
2...Contact plate, 12b...Press surface, 14...Operation member, 21...Receiving portion, 23...Pin (protrusion).

Claims (1)

[Scope of utility model registration request] A support terminal is provided in the case, and a fixed terminal is provided on one side of the support terminal and a protrusion is provided on the other side, and one end of the contact plate whose midway portion is supported by the support terminal has the above-mentioned A contact point facing the fixed terminal is fixedly installed, and a hole is formed at the other end through which the protrusion is inserted, and the contact plate has a pressing surface that slopes upward from the middle part toward both ends. A single-throw circuit type seesaw switch, in which a pressing surface is formed with an operating member in sliding contact with the pressing surface, and a protrusion facing the lower side of the pressing surface is provided inside the case.