JPH0828160B2 - Auxiliary switch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary switch.

[0002]

2. Description of the Related Art Auxiliary switches used for power switches and circuit breakers have large voltage and current, and use silver contacts at the contact parts. A contact part is required even for low voltage and low current regions,
Gold plated contacts have come to be used.

[0003]

Even if a gold-plated contact is used, fine dust adhering to the surface of the gold contact causes a current non-conduction in a minute current region, causing a failure.
Also, it is difficult to apply the good points of the gold material because the gold under the contact part of the gold plating hangs on the surface from the pinhole etc. and forms an oxide film. This led to higher prices, and there were many problems, requiring an auxiliary switch with a new structure.

Although the use of a reed switch has been generalized in electronic equipment, the magnetic circuit cannot be housed in a compact size when it is used inside an auxiliary switch.
It has been difficult to compact magnetic circuits. Regarding the reed switch, the characteristics of the reed switch and the permanent magnet differ greatly in the operating characteristics depending on the direction of the permanent magnet and the moving direction of the reed switch.When assembled in the equipment, the stroke of the permanent magnet is too short in the horizontal direction, The direction is long,
The positional relationship between the "ON" and "OFF" permanent magnets and the reed switch also greatly varied, and sometimes the balance with external equipment could not be balanced. In addition, there is always a risk that the adjacent contactor is affected in the vertical direction requiring the stroke of the permanent magnet and a malfunction occurs.

In addition, when the reed switch is incorporated in the main body of the auxiliary switch, it is necessary to integrate the reed switch with terminals as much as possible to improve the strength in order to prevent breakage that impairs the function of the reed switch. Furthermore, the normally open contact (hereinafter referred to as “a contact”) and the normally closed contact (hereinafter referred to as “b contact”) that are the same size and have a large number of parts must be configured with two types of integrated parts. Therefore, rationalization of molds and parts management has been desired by using unified components.

Furthermore, it is necessary that the interlocking bar for driving the reed switch is easily assembled, and the contact point a and contact point b must be accurately mounted and the reliability must be improved. . An object of the present invention is to provide an auxiliary switch which can be used for digitization and electronic control which will increase in the future by configuring a reed switch having a good environmental adaptability as a contact portion of the auxiliary switch.

[0007]

In order to achieve the above object, the present invention comprises a reed switch as a contactor of an auxiliary switch and a permanent magnet for driving. The present invention is based on the mutual operation characteristics of the contact reed switch and the permanent magnet, and as a basic structure, the S and N poles of the magnet are arranged on the same plane with respect to the reed switch, and the permanent magnet is arranged in the thrust direction of the reed switch. On the other hand, the contact is repeatedly turned on and off by moving the side of the reed switch in parallel at an angle. With this operation, the reed switch can increase the operating distance of the permanent magnet in the vertical operation which is the basic operation of the permanent magnet. This leads to a larger stroke of the interlocking bar and maintains the stability of the operation of the auxiliary switch. Further, by this, it is possible to suppress the deviation of the ON / OFF operating points due to the hysteresis of the operation of the permanent magnet of the reed switch.

In the auxiliary switch, it is necessary that the operation of the a-contact and the operation of the b-contact are not overlapped in terms of its function. Therefore, in the operation characteristics of the reed switch and the permanent magnet, the reed switch is in a non-conducting OFF region. Since the HOLD region and the ON region where the reed switch conducts have a short stroke, wrapping between contacts does not occur. Therefore, by using the operating line C shown in FIG. 5, proper and accurate characteristics of FIG. 7 can be obtained. . Fig. 7 shows that even if the contact b is changed from the ON state to the contact a, the movement of the permanent magnet is short.
mm means there is no wrap between the a and b contacts.

Adjacent reed switches are secured by increasing the distance between a-contacts and a-contacts adjacent to each other in order to prevent malfunctions due to influences other than the permanent magnets that make up the adjacent reed switches. However, between the a-contact and the b-contact, the pair of permanent magnets have N and S poles in the directions in which they affect each other, so the pair of permanent magnets completely polarizes the reed switch to protect it. are doing.

The reed switch and the permanent magnet ensure a position in the structure which does not affect each other and a position in which the reed switch can be reliably operated. The a-contact and the b-contact are composed of a small number of parts, and the a-contact is composed of the same part. Configure the b contact. The reed switch terminal portions are shown in FIGS. 10, 11, 12, and 13. Fig. 14 shows the disassembled arrangement of the reed switch terminal parts. Further, in FIG. 15, the drive permanent magnet holding structure is entirely configured by one-touch assembly. The permanent magnet is attached to the magnet case, and the assembled magnet case is hooked from the left and right of the interlocking bar to the magnet case. Since it is formed, the interlocking bar is mounted and formed so as to sandwich the interlocking bar, and the interlocking bar holding the permanent magnet can be easily formed.

[0011]

[Operation] The basic operation of the permanent magnet and the reed switch is shown in FIG.
As shown in, the thrust direction of the reed switch L (X-
(X) is moved in the direction perpendicular to the direction (Y-Y) by the permanent magnet M magnetized with N and S poles in the direction of the arrow, the reed switch L is in the ON part where it conducts, and HOLD in the intermediate state between conduction and non-conduction.
Section, the reed switch L is in a non-conductive OFF section.

The HOLD portion is large in the vertical direction, and the HOLD portion is small in the thrust direction. In this relationship diagram, HOL
It is necessary to make the D part as small as possible to turn the switch on and off.
It is essential for the stability of. As described above, the present invention realizes that two parts based on the reed switch and the permanent magnet are built in, and the size of the switch and the stroke required for the switch are integrated in one auxiliary switch. For example, as shown in FIG. 6, when the operation stroke required for an arbitrary position in the operation characteristics of the reed switch due to the movement of the permanent magnet is obtained and drawn by a straight line, the inclination angle of the reed switch becomes Decided. This determines the size of the switch in the reed switch and the size of the switch.

When the reed switch and the permanent magnet move on the straight line of the straight line A in FIG. 6, the a contact changes from OFF to ON as shown in the mutual relationship diagram of the a contact and the b contact in FIG. When the b-contact is mutually configured at a position where the straight line B changes from ON to OFF, a relational diagram shown in FIG. 7 is obtained. FIG. 8 shows the standard state in which this positional relationship is built in the switch. In FIG. 8, the reed switch L ₁ is a permanent magnet M ₁
Under the direct influence of, the contact ensures the ON state. Also, the reed switch L ₂ is a little away from the permanent magnet M _2, is under the influence of the permanent magnet M ₂ is to ensure the state of OFF. This positional relationship is ON in FIG.
It agrees with the areas indicated by the area and the OFF area. a
At the contact, the permanent magnet M ₃ is OF with respect to the reed switch L _2.
Although it has a slight influence of being in the F state, this can perform a more stable opening / closing operation in the direction of assisting the operation. Each of the permanent magnets M ₂ and M ₃ acts on the reed switch L in the function and the forward direction, and the permanent magnets M ₁ and M ₂ are one of the permanent magnets M.
_{Even if 2} acts in reverse, the permanent magnet M ₁ is completely on the reed switch L, and the influence of other permanent magnets M is negligible.

FIG. 9 shows a state in which the interlocking bar 12 moves from the standard state in the direction of the arrow D, and it can be said that the basic operation is completely opposite to the standard state. Therefore, both the a contact and the b contact operate stably. When the reed switch is housed and formed in the case inside the auxiliary switch, the reed switch shown in FIG.
And the holding structure of the reed switch shown in FIG. 9 is important, and two reed switches are put in parallel to improve the reliability of the reed switch. These are shown in Figures 10, 11, 12, and 13.

In the reed switch terminal portion 24 which holds the reed switch L and is connected to the terminal fitting 35 with the solder 22, the reed switch L is mounted in the same direction with an oblique angle.
The reed switch terminal portions 24 mounted in the same direction are inserted and fixed in the case 11 of the auxiliary switch. The fixing method is to fix the reed switch terminal portion 24 by fitting it into the case 11.

The reed switch L is formed by inserting the a contact and the b contact in opposite directions. The formed state is shown in FIG. When incorporating a permanent magnet for driving a reed switch in the auxiliary switch,
Generally, it is engraved or adhered in the interlocking bar 12, but in the present invention, the permanent magnet M is fitted in the magnet case 52, and the magnet case 52 attaches to the interlocking bar 12 a contact and b.
The contacts can be fitted in arbitrary positions, and as one example, as shown in FIG. 4, the right three points can be set to the b contacts and the left four points can be set to the a contacts. Although it is necessary to coordinate the fitting direction with that of FIG. 3, it is possible to form the a contact point and the b contact point arbitrarily in the case of the auxiliary switch by matching the direction of the reed switch L and the direction of the permanent magnet M. it can. In the present invention, the permanent magnets M are arranged with respect to the reed switch L in the same distance over the entire length of the permanent magnet M, and the polarity of the permanent magnet M is provided in the same direction (parallel) as the reed switch L. So,
The arrangement of the permanent magnet M with respect to the reed switch L of the permanent magnet M of the present invention is such that the distance between one end and the other end of the permanent magnet M with respect to the reed switch L is different, and the permanent magnet M is not parallel to the reed switch L. Than reed switch L
The contact part of is easily excited. The one in which the permanent magnets M are arranged non-parallel to the reed switch L with different distances at one end and the other end is one that facilitates stable catching of movement from a distant place to a near place. Different from the invention.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a front view of the auxiliary switch of the present invention, and FIG. 2 is a side view of the case 11 in which a reed switch terminal portion 24 is inserted into a case 11 and an interlocking bar 12 is incorporated therein, and the interlocking bar 12 is attached to the upper part of the case 11. A cover 13 is assembled and fixed for protection. Interlocking bar
A return spring 14 is attached to 12 so that the return operation is automatically performed after the pushing operation, thereby forming an auxiliary switch. Sign
15 is a terminal screw.

FIG. 3 shows a state in which the reed switch L is assembled to the reed switch case 17 and soldered to the terminal portion 24, and is inserted into the reed switch case 17, and the b contact portion has three circuits. , A contact part has four circuits incorporated therein. FIG. 4 shows an interlocking bar 12 in which a corresponding drive permanent magnet is assembled. FIG. 14 shows the reed switch L and the terminal portion 24 as an exploded view of the parts to be assembled.

The reed switch case 17 is a plate-shaped rectangular parallelepiped made of synthetic resin and has an oblique storage hole 31, a support pin 32 projecting from the side surface, and a projecting wall 33 projecting from the other side surface. Forming 34. In addition, the thin metal terminal fitting 35 extends downwardly from both edges of the seat plate 37 engraved with the terminal holes 36 for receiving the terminal screws 15 and extends downward from the other edge of the seat plate 37. The connecting piece 39 is extended toward, the bottom piece 40 is orthogonally extended from the lower end of the connecting piece 39, the two standing pieces 41, 42 are raised from the bottom piece 40, and one standing piece 41 has a tip end. A support groove 44 for supporting the lead wire 43 of the reed switch L is engraved, and a hole 45 for fitting the support pin 32 of the reed switch case 17 is formed in the central portion and a support hole 47 for the lead wire 43 is formed in the lower part. A support groove 44 is also formed in the upper end of the other standing piece 42, and a notch 46 for fitting the protruding wall 33 of the reed switch case 17 is formed in the center, and a support hole 47 for the lead wire 43 is formed in the lower part. Has been drilled.

The reed switch terminal portion 24 has the same reed switch L and reed switch case as shown in FIG.
17 and two terminal fittings 35 are prepared. The reed switch L is housed in the housing hole 31 of the reed switch case 17, and the support pin 32 of the reed switch case 17 is attached to the terminal fitting.
The upright piece 42 is fitted in the hole 45 and the notch 46 is engaged with the projecting wall 33 to be mounted in the vertical groove 34, and the lead wire 43 is fitted in the support groove 44 and fixed by soldering. When assembled,
This is shown in FIGS.

Further, as shown in FIG. 15, the interlocking bar 12 is
It is an elongated plate-shaped rectangular parallelepiped made of synthetic resin and slides on the central portion of the case 11, and the reed switch L attached to the case 11 by the reed switch terminal portion 24 is turned on by a permanent magnet M.
N / OFF. The interlocking bar 12 is provided with a plurality of (seven in this embodiment) window holes 51, and the magnet case 52 in which the permanent magnet M is fitted is fitted into the window hole 51.
At the periphery of the window hole 51 of the interlocking bar 12, there is formed a fitting hole 54 that fits with a projection 53 projecting near the outer periphery of the back surface of the magnet case 52, and a hook 55 is projected at the center.
A projection wall surface 56 for receiving the permanent magnet M is formed on the surface of 52. When the magnet case 52 is fitted from both sides of the interlocking bar 12, the hooks 55 engage with each other and are attached.

The permanent magnet M has N and S poles formed on the same outer surface facing the reed switch L. Figure
Fig. 16 shows a conventional auxiliary switch with a silver contact specification, and Fig. 17 shows its sectional view. The interlocking bar 112 slides in the central part of the case 111, and the movable terminal plate 162 of the interlocking bar 112 is arranged to face the stationary terminal plate 161 fixed to the case 111. It is silver plated. A reed switch and a permanent magnet can also be incorporated in this conventional auxiliary switch.

[0023]

As described in detail above, in the present invention,
It is possible to control in the minute voltage / current region by changing the generalized auxiliary switch of the method of gold-plating the silver contacts to a reed switch in which the contacts are filled with gas, and used in the environment of gas and fine dust. By constructing an endurance auxiliary switch, it will be possible to directly connect to electronic devices and digital devices, which have not progressed at present, and contribute to expansion of applications and reliability.

Further, the present invention does not consider that the reed switch simply performs the "ON" and "OFF" operations,
It can be generally provided that the advantages of the reed switch in terms of operating characteristics can be easily configured in the device, and that the device can be set by determining the storage space and the operating stroke from the basic operation. Moreover, in the present invention, the use of the reed switch in the device to prevent wrapping can greatly change the conventional concept.

Further, according to the present invention, it is possible to use reed switches in parallel in the storage method for improving reliability with a simple method and a small number of parts. Recombining can be done with one touch, which saves labor and labor. Furthermore, in the present invention, even the interlocking bar can be easily assembled with one touch and the structure is simple, so that even an unskilled person can easily assemble without error. Since the housing of the contact terminal part of the case is shared, it is possible to assemble using both the voltage / current region and the minute current region, which require the conventional silver contacts, and the connection with control devices will be further expanded.

[Brief description of drawings]

FIG. 1 is a front view of an auxiliary switch according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a sectional view taken along the line AA ′ in FIG.

FIG. 4 is a side view of an interlocking bar.

FIG. 5 is a characteristic diagram of movement of a permanent magnet with respect to a reed switch.

FIG. 6 is an operation characteristic diagram of a reed switch according to movement of a permanent magnet.

FIG. 7 is a diagram showing the relationship between an a-contact and a b-contact.

FIG. 8 is a side view of the interlocking bar in a standard state.

9 is a side view showing a state where the interlocking bar has moved in the direction of arrow D. FIG.

FIG. 10 is a plan view of a reed switch terminal portion.

FIG. 11 is a side view of a reed switch terminal portion.

FIG. 12 is an enlarged view of AA ′ of FIG. 11.

FIG. 13 is an enlarged view of BB ′ in FIG. 11.

FIG. 14 is an exploded view of components of a reed switch terminal portion.

FIG. 15 is an exploded view of parts of the permanent magnet and the interlocking bar.

FIG. 16 is a side view of a conventional auxiliary switch using a silver contact.

FIG. 17 is a sectional view of a conventional auxiliary switch using a silver contact.

[Explanation of symbols] 11 ... Case 12 ... Interlocking bar 13 ... Cover 14 ... Return spring 15 ... Terminal screw M ... Permanent magnet L ... Reed switch 17 ... Reed switch case 35 ... Terminal metal 24 ... Reed switch terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Okawa 8 Horai-cho, Marugame-shi, Kagawa Mitsubishi Electric Corporation Marugame Plant (72) Inventor Shigeru Nakajima 3-4-1 Nomura, Kusatsu-shi, Shiga Fuji Electric Co., Ltd. Kusatsu Manufacturing Co., Ltd. (72) Inventor Yoshihiro Tanaka 3-4-1 Nomura, Kusatsu City, Shiga Prefecture Fuji Electric Co., Ltd. Kusatsu Manufacturing Co., Ltd. (56) Reference JP-A-60-181838 (JP, A)

Claims (6)

[Claims] 1. An auxiliary switch for opening and closing a reed switch L by moving the permanent magnet M, wherein the permanent magnet M is arranged in parallel with the reed switch L so that the polarity of the permanent magnet M is in the same direction as the reed switch L. Provided, permanent magnet M
Is an oblique switch with respect to the thrust direction of the reed switch L, and the side of the reed switch L is moved parallel to the auxiliary switch. 2. A reed switch L is opened and closed by moving the permanent magnet M, the permanent magnet M is arranged in parallel with the reed switch L, and the polarity of the permanent magnet M is provided in the same direction as the reed switch L. In an auxiliary switch in which M is moved obliquely to the thrust direction of the reed switch L and parallel to the side of the reed switch L, the moving range in the pushing direction and the returning direction in which the permanent magnet M is provided is set to be short. , Auxiliary switch which is characterized in that the normally open contact and normally closed contact of the reed switch L are not overlapped on and off operating points. 3. Reed switches adjacent to each other between the reed switches L and between the normally open contact and the normally closed contact by moving the reed switch driving permanent magnet M obliquely with respect to the thrust direction of the reed switch L. The auxiliary switch according to claim 1, wherein the influence of the driving permanent magnet M is reduced. 4. A case 17 for holding the reed switch L and a terminal fitting 35 for external connection are integrally assembled, and are built in one direction for normally open contacts and in the opposite direction for normally closed contacts. The auxiliary switch according to claim 1. 5. In a structure in which a permanent magnet M for driving a reed switch is attached to the interlocking bar 12, the permanent magnet M is fitted in the magnet case 52, and the magnet case 52 with the permanent magnet M is fitted in the interlocking bar 12 from the left and right to be integrated. 2. The auxiliary switch according to claim 1, wherein the normally open contact is mounted in the direction of the normally open contact, and the normally closed contact is mounted in the opposite direction to drive the normally closed contact. 6. The auxiliary switch according to claim 1, wherein the reed switch driving interlocking bar 12 can be fitted with a reed switch driving permanent magnet M and a silver contact.