JP2002367470A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly fix a fixed terminal without producing resin powder or the like and to avoid adverse effects on a contact part by metal powder produced in tightening of a screw, in a switch equipped equipped in a case, the fixed terminals each provided with a fixed contact and a screw hole for a terminal screw, and moving terminals each provided with a moving contact facing the fixed contact. SOLUTION: The fixed terminals 5, 6 and 9 are inserted and mounted into a terminal support cover 13 built into the case 4, the fixed terminal insertion direction is set in a direction different from the axial direction of the screw holes 15 for mounting the terminal screws, and the fixed terminals 5, 6 and 9 are engaged with the support cover 13, so as to be disengaging only in the fixed terminal insertion/extraction directions. A screw housing chamber 22 into which the tip part of each terminal screw mounted to the screw hole 15 is plunged is formed in the support cover 13, and the contact part is positioned at the outside the housing chamber 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a switch such as a limit switch.

[0002]

2. Description of the Related Art Generally, a limit switch slides a movable member by an externally operated plunger, and moves a movable terminal provided on the movable member toward and away from a fixed terminal fixed to a main body case. The terminal is configured to open and close a contact, and a terminal screw for external wiring is attached to the fixed terminal. The fixed terminal has a structure in which the fixed terminal is pressed into a slit or the like formed inside the main body case from the case opening and fixed.

[0003]

In a conventional switch of this type, the fixed terminal is connected to the direction of the opening of the main body case.
In other words, since the terminal screws were pressed into the main body case from the mounting direction, the fixed terminals may come out if carelessly applying an outward force, such as when performing wiring connection processing. . Therefore, in order to prevent the fixing terminal from easily coming off, the fixing terminal is strongly pressed in to secure a large fastening force.

However, if the fixed terminal is configured to be strongly press-fitted in order to obtain a sufficient fastening force, not only a large operation force is required when assembling the fixed terminal, but also the terminal mounting of the resin body case is performed. The portion is shaved and resin powder is likely to be generated. If the generated resin powder enters the contact portion, the switching operation may be hindered. In particular, in the fixed terminal assembling step, since the fixed terminal is press-fitted from above with the opening of the main body case facing upward, the resin powder generated at the time of terminal press-fitting is likely to fall into contact points in the case and penetrate. Therefore, the resin powder had to be carefully removed after assembling the terminals.

[0005] In addition, terminal screws are mounted on the fixed terminals. In this case, too, the screw holes or the screws of the fixed terminals are cut off by the mounting of the terminal screws, and metal powder is generated. There was a risk of intrusion into the contact.

The present invention has been made in view of such circumstances, and can fix a fixed terminal firmly with less generation of resin powder and the like, and a metal powder generated at the time of screw tightening. It is an object of the present invention to provide a switch capable of avoiding the adverse effects of the switch.

[0007]

In order to achieve the above object, the present invention has the following configuration.

That is, a switch according to the present invention is a switch in which a fixed terminal having a fixed contact and a screw hole of a terminal screw and a movable terminal having a movable contact opposed to the fixed contact are incorporated in a case. The fixed terminal is inserted and mounted on a terminal support cover attached to the case, and the fixed terminal insertion direction is set to a direction different from the axial direction of the screw hole.

According to the present invention, the fixed terminal cannot be moved in the mounting direction of the terminal screw, so that the fixed terminal can be reliably prevented from coming out of the terminal support cover. Therefore, the generation of resin powder during terminal insertion is extremely reduced.

[0010] In another embodiment of the present invention, the fixed terminal and the terminal support cover are respectively formed with engaging portions that are engaged and disengaged only in the fixed terminal insertion and removal direction.

According to the present invention, when the fixed terminal is inserted and mounted on the terminal support cover, the engaging portion of the fixed terminal and the engaging portion of the terminal support cover are engaged, and the movement of the terminal screw in the mounting direction is enhanced. Will be blocked.

In one embodiment of the present invention, the engaging portions of the fixed terminals are formed symmetrically on both sides in the direction of inserting and removing the fixed terminals.

According to the present invention, the fixed terminal can be mounted and used in common on a pair of terminal mounting portions whose mounting directions are opposite to each other, which is effective in reducing the number of parts and reducing costs.

In a preferred embodiment of the present invention, the fixed terminal is prevented from coming out of the terminal support cover by the inner surface of the case when the terminal support cover is fitted inside the case.

According to the present invention, after the fixed terminal is attached to the terminal support cover, the terminal support cover is fitted inside the main body case, so that the fixed terminal cannot completely come out.
Also, when the terminal support cover is removed from the body case, the fixed terminal can be removed from the terminal support cover,
The replacement of the fixed terminal is also easy, and the maintenance is easy.

In another embodiment of the present invention, a screw accommodating chamber is formed in the terminal support cover, into which a tip of a terminal screw mounted in the screw hole enters, and a fixed terminal is provided outside the screw accommodating chamber. Fixed contacts are located.

According to the present invention, even if metal powder is generated when the terminal screw is fastened to the fixed terminal attached to the terminal support cover, the metal powder is received in the screw accommodating chamber and penetrates into the contact portion. There is no.

In still another embodiment of the present invention,
A movable member supporting the movable terminal is movably attached to the case to which the terminal support cover is assembled, and is attached to a main body case having a plunger operated externally.

According to the present invention, a switch unit is constructed by assembling a terminal support cover to a case, and by assembling the switch unit into an arbitrary body case, a limit switch having desired specifications can be assembled. The switch alone can be effectively used as a highly versatile functional unit.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a limit switch will be described below with reference to the drawings.

FIG. 1 is an overall external view of the limit switch, FIG. 2 is a longitudinal front view thereof, and FIG.
The longitudinal side views are shown respectively. This limit switch switches the contacts of the switch A provided by pushing a plunger 2 protruding from the upper end of the main body case 1, and swings around a lower fulcrum x on the front surface of the main body case 1. Front cover 3 that can be opened and closed
By opening the switch, the internal switch A is exposed, and wiring connection can be performed in the same manner as in the related art.

As shown in FIG. 4, the switch A itself includes two sets of upper and lower fixed terminals 5, 6, one pair of left and right parts forming two normally closed circuits, inside a case 4 having an open front.
Two movable terminals 7 and 8 opposed to these from below, a pair of left and right fixed terminals 9 constituting a normally open circuit, a movable terminal 10 opposed to these from above, and three movable terminals 7, 8, 10 Movable member 1 elastically supported so as to be vertically displaceable
1, etc. are incorporated, and the plunger 2
In a normal state where no external force acts on the movable member 11 as shown in FIG.
One normally closed circuit is closed and one normally open circuit is kept open. When the plunger 2 is pushed in and the movable member 11 is displaced downward against the return spring 12, the two One normally closed circuit is opened and 1
One normally open circuit is closed.

FIG. 4 shows the detailed structure of the switch A.
This will be described with reference to FIG.

The fixed terminals 5 and 6 for the normally closed circuit and the fixed terminals 9 for the normally open circuit are inserted into a resin terminal support cover 13 provided separately from the case 4 from a lateral direction. It is attached and fastened as follows.

The uppermost fixed terminal 5 is shown in FIG. 9 and FIG.
As shown in FIG.
The upper side 5a is bent to form a longer U-shape.
A fixed contact 5c is provided on the lower surface of the front end of each of them, and a screw hole 15 for mounting a terminal screw 14 is formed in a central portion 5d serving as a connection seat for external wiring so as to penetrate in the front-rear direction. On the other hand, on the left and right sides of the terminal support cover 13, a recessed step 16 for inserting and mounting the upper side 5a of the fixed terminal 5 from the lateral direction and a mounting groove 17 for inserting and mounting the lower side 5b from the lateral direction are formed. And the upper side 5a of the fixed terminal 5
The lower side 5b is inserted into the recessed step 16 and the mounting groove 17 only from the lateral direction and mounted.

At the left and right edges of the upper side 5a and the lower side 5b, engaging pieces 5e as retaining engagement portions are symmetrically projected, and a recessed step for supporting the upper side 5a and the lower side 5b. An engagement recess 18 as a retaining engagement portion is formed in the portion 16 and the mounting groove 17.
The engagement piece 5e is engaged with the fixed terminal 5
Is prevented from getting out in the front-rear direction. Here, since the fixed terminal 5 is formed symmetrically as described above, it is shared by the left fixed terminal and the right fixed terminal.

The fixed terminal 6 at the next stage also has an upper side 6 in a side view shape.
a is bent and formed in a U-shape longer than the lower side 6b,
A fixed contact 6c is provided on the lower surface of the top end of the upper side 6a, and a screw hole 15 for mounting a terminal screw is formed in the central portion 6d. Then, the upper side 6a and the lower side 6b are inserted into the lateral mounting grooves 17 formed in the upper and lower partitions 19 of the terminal support cover 13 from the lateral direction, and are mounted.
The engagement pieces 5e protruding from the upper side 6a and the lower side 6b are engaged with the engagement recesses 18 formed inside the mounting groove 17, so that the fixed terminal 6 is prevented from coming out in the front-rear direction. It has become.

The lowermost fixed terminal 9 has a lower side 9b longer than the upper side 9a in a side view shape and is formed in a substantially U-shape that is bent downward and extended downward. Is provided with a fixed contact 9c, and a central portion 9d
Is formed with a screw hole 15 for mounting a terminal screw. The partition wall 19 and the bottom wall 20 below the terminal support cover 13
The upper side 9a and the lower side 9b are inserted into the lateral mounting groove 17 formed in
a and an engagement piece 9e projecting symmetrically from the lower side 9b.
Is fixed to an engagement recess 18 formed in the inner side of the mounting groove 17, so that the fixed terminal 9 is prevented from coming out in the front-rear direction.

Further, the terminal support cover 13 is formed with a vertical partition wall 21 which enters between the upper and lower sides at a position corresponding to the inner side of the fixed terminal 5, 6 and 9 for insertion. The front of the wall 21 is formed as a screw housing chamber 22 into which the distal end of the terminal screw 14 mounted in the screw hole 15 of the fixed terminal 5, 6, 9 is inserted. The fixed contacts 5 c, 6 c, 9 c of the fixed terminals 5, 6, 9 are located at positions away from the screw housing chamber 22 on the back side. As described above, by forming the screw housing chamber 22 inside the screw hole 15, the metal powder generated by tightening and mounting the terminal screw 14 can intrude into the contact portion. It is to be blocked by.

As described above, a recess 23 is formed on the back of the terminal support cover 13 in which the fixed terminals 5, 6, 9 are inserted and supported, and a movable member which supports the movable terminals 7, 8, 10 therein. 11 is slidably guided up and down, and the upward movement limit of the movable member 11 is limited to the downward stepped portion 2 shown in FIG.
4 and the upwardly-facing step 25 shown in FIG. 8 formed on the upper part of the movable member 11.

As shown in FIG. 8, the movable member 11 is formed with three horizontal openings 26 through which horizontally long movable terminals 7, 8, 10 having movable contacts 7c, 8c, 10c at both ends are inserted. The guide pin 27 shown in FIG. 4 provided in the opening 26 is inserted into the center of each of the movable terminals 7, 8, and 10, and the movable terminals 7, 8, and 10 are engaged so as to be vertically displaceable. Supported. Each movable terminal 7, 8, 10 is slid in the direction toward the corresponding fixed terminal 5, 6, 9 by a spring 28 externally fitted to each guide pin 27, so that the movable member 11 is at the upper limit. In some cases, the movable terminals 7 and 8 are pressed against the fixed terminals 5 and 6 with a suitable elastic force by the spring 28, and the movable terminal 10 is appropriately pressed against the fixed terminal 9 by the spring 28 in the contact switching state moved downward. They are pressed by elastic force.

When assembling the switch A, the fixed terminals 5, 6, and 9 are inserted into the terminal support cover 13 from the lateral direction and mounted, and then the movable member 1 supporting the movable terminals 7, 8, and 10 is mounted.
1 into the recess 23 of the terminal support cover 13 and the case 4
Spring receiving recess 4a protruding from the lower end of the movable member 1
The terminal support cover 13 is inserted from the front surface of the case 4 with the return spring 12 interposed between the lower end of the terminal support cover 1 and the engagement protrusion 13 a protruding from the upper end of the terminal support cover 13. FIG. 7 shows a state in which the terminal support cover 13 is engaged with the engagement groove 30 formed in
Is engaged with engagement recesses 32 formed on the left and right sides of the lower end of the case 4 so that the movable member 1
1 can be positioned and fixed to the case 4 with the terminal support cover 13 supporting the terminal 1. Note that the upper and lower two-stage partition walls 19 provided on the terminal support cover 13 are recessed at their distal ends, so that the guide projections 3 provided on the left and right inner surfaces of the case 4 are provided.
3 Further, the movable member 11 incorporated in the case 4 is also guided by a pair of left and right guide projections 34 shown in FIG. I have.

Here, when the terminal support cover 13 is inserted and fixed to the case 4, the left and right outer ends of the central portions 5 d, 6 d, 9 d of the fixed terminals 5, 6, 9 are close to the left and right inner surfaces of the case 4. For this reason, the fixed terminals 5, 6, and 9 cannot be pulled out in the direction opposite to the insertion direction, and there is a possibility that the fixed terminals 5, 6, and 9 may come out even if an external force is applied to the fixed terminals 5, 6, and 9 in a forward direction. Absent.

The main body case 1 assembled as described above
The switch A is connected to the main body case 1 with a screw or a caulking via a mounting portion 4c shown in FIG. The plunger 2 is inserted and connected to the connection hole 35, and the rubber boot 3 for sealing is further inserted.
6 is mounted to complete the limit switch.

The present invention can be implemented in the following modes.

(1) In the above embodiment, the switch A is constructed by assembling the terminal support cover 13 to the case 4, and the switch A is assembled to the case body 1 to constitute a desired form of limit switch. However, the case 4 is
The terminal support cover 13 can be directly assembled to the case body 1 to form a switch of a desired form.

(2) Contrary to the above embodiment, the engaging portions formed on the fixed terminals 5, 6, and 9 are formed as engaging concave portions, and the engaging portions formed on the terminal support cover 13 are formed as engaging projections. You can also.

(3) The engaging portions (engaging pieces or engaging concave portions) formed on the fixed terminals 5, 6, and 9 may be formed on only one lateral side and have different right and left sides.

(4) The direction in which the fixed terminal is inserted into the terminal support cover 13 is not limited to the horizontal direction. Depending on the shape of the terminal, it is possible to insert the terminal from the up and down directions. If the direction is different from the center direction, it is possible to prevent the fixed terminal from inadvertently coming out in the case of wiring connection operation or the like.

[0040]

As described above, according to the present invention, the insertion direction of the fixed terminal is made different from the axial direction of the screw hole. It is different from the direction, it can be reliably prevented from falling out of the terminal support cover, and it is not necessary to strongly press-fit so that large removal resistance is exhibited unlike the conventional, Generation of powder is also extremely reduced. As a result, the step of removing the resin powder can be omitted or a simple removal step can be performed, and high switching performance without the influence of the resin powder can be secured while increasing the productivity.

Further, by adopting a configuration in which the tip end of the terminal screw tightened into the screw hole of the fixed terminal enters the screw accommodating chamber of the terminal support cover, even if metal powder is generated during the screwing operation, the screw accommodating can be performed. Intrusion into the outdoor contact portion is prevented, and highly reliable switching performance unaffected by metal powder can be exhibited.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a limit switch using a switch according to the present invention.

FIG. 2 is a vertical sectional front view of a limit switch.

FIG. 3 is a vertical sectional side view of a limit switch.

FIG. 4 is a vertical sectional front view showing a contact portion of a single switch.

FIG. 5 is an external perspective view of a single switch.

FIG. 6 is a cross-sectional plan view of a single switch.

FIG. 7 is an exploded perspective view of the switch alone.

FIG. 8 is an exploded perspective view of a switch component.

FIG. 9 is an exploded perspective view of the fixed terminal mounting structure as viewed from the front.

FIG. 10 is a vertical sectional front view of the terminal support cover.

FIG. 11 is an exploded perspective view of the fixed terminal mounting structure as viewed from the rear.

[Explanation of symbols]

 Reference Signs List 4 case 5 fixed terminal 5e engaging part 6 fixed terminal 6e engaging part 9 fixed terminal 9e engaging part 7 movable terminal 8 movable terminal 10 movable terminal 11 movable member 13 terminal support cover 14 terminal screw 15 screw hole 18 engagement part 22 Screw accommodation room

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01R 9/00 H01R 9/00 Z (72) Inventor Katsumi Katsumi Masaki 801 Fudodoucho Omron Co., Ltd. 801 Shiouji-dori, Horikawa-Higashi-iri, Minami-Fudo-cho, Omron Co., Ltd. Address OMRON Kurayoshi Co., Ltd. F term (reference) 5E086 DD05 DD37 DD44 HH02 HH20 JJ03 LL10 LL20 5G006 AA02 AB38 AC02 BA01 BA02 BB01 BC06 CD01 DD01 5G025 BA04 CA09 DA01 5G051 AA27 AC24 EA02 EA08 EA17

Claims (6)

[Claims] 1. A switch in which a fixed terminal having a fixed contact and a screw hole of a terminal screw and a movable terminal having a movable contact opposed to the fixed contact are incorporated in a case, wherein a terminal support assembled to the case is provided. A switch, wherein the fixed terminal is inserted and mounted on a cover, and a fixed terminal insertion direction is set to a direction different from an axial direction of the screw hole. 2. The switch according to claim 1, wherein the fixed terminal and the terminal support cover each have an engagement portion that engages and disengages only in the fixed terminal insertion / removal direction. 3. The switch according to claim 2, wherein the engaging portions of the fixed terminal are formed symmetrically on both sides in the fixed terminal insertion / removal direction. 4. The switch according to claim 1, wherein the fixed terminal comes out of the terminal support cover by the inner surface of the case in a state where the terminal support cover is fitted inside the case. A switch characterized by being blocked from contact. 5. The switch according to claim 1, wherein a screw accommodating chamber into which a tip end of a terminal screw mounted in the screw hole enters is formed in the terminal support cover. A switch, wherein a fixed contact of a fixed terminal is located outside the screw housing chamber. 6. The switch according to claim 1, wherein a movable member supporting the movable terminal is movably attached to the case to which the terminal support cover is attached, so that external operation is possible. The switch is mounted on a main body case having a plunger to be mounted.