JP2011231550A - Magnet catch with switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnet catch with a switch, which exhibits impact durability and high waterproofness while preventing generation of dust caused by collision of metals between an adsorption plate and a yoke.SOLUTION: A body 1 of a magnet catch with a switch includes a nonmagnetic case 3 with storage space 4, a permanent magnet 5, a yoke 6, and a microswitch 7 air-tightly stored in the storage space 4. The case 3 includes a case body 9 and a lid body 10 for closing an opening 16. A drive plate 27 of the yoke 6 drives an actuator 26 by approaching and separating from the microswitch 7. When an adsorption plate 2 abuts against a second side wall 12, the permanent magnet 5 is pulled toward the second side wall 12 together with the yoke 6. A spring 29 constantly keeps the yoke 6 in a position to depress the actuator 26 of the microswitch 7. When the adsorption plate 2 abuts against the second side wall 12, the yoke 6 compresses the spring 29 to separate from the microswitch 7 so that the actuator 26 protrudes.

Description

  The present invention relates to a magnet catch in which a micro switch is accommodated inside a case.

  2. Description of the Related Art Conventionally, a magnet catch is known that includes a main body that houses a permanent magnet and a yoke in a case, and an attracting plate that magnetically attracts the edge of the yoke exposed from the case. In addition, the micro switch is housed in the main body case, the actuator of the micro switch is protruded from the case, and when the suction plate is attracted to the yoke, the actuator is pushed to operate the micro switch. A magnet catch with a switch that emits an electrical signal is known (see Patent Document 1).

Japanese Utility Model Laid-Open No. 02-118075

The conventional magnet catch with a switch has the following problems. First, since there is a problem of dust generation due to collision between the metal of the suction plate and the yoke, it is not suitable for use in a clean room. Secondly, the service life of the switch is shortened by the impact when the actuator and the suction plate directly collide. Third, the operation of the actuator is not stable due to the contact between the suction plate and the yoke. Fourth, since the actuator is exposed from the case, the built-in member is likely to be corroded by being immersed in the case.
Therefore, an object of the present invention is to provide a magnet catch with a switch that solves the above-mentioned problems.

Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
In order to solve the above problems, a main body 1 of a magnet catch with a switch according to this application includes a non-magnetic case 3 having a storage space 4 inside, and a permanent magnet 5 hermetically stored in the storage space 4, A yoke 6 and a microswitch 7 are provided. The case 3 includes a case main body 9 that is integrally molded and a lid body 10 that closes an opening 16 of the case main body 9. The case body 9 includes first to fourth side walls 11, 12, 13, and 14 that surround the four sides of the storage space 4, a fifth side wall 15 that closes one end side of these four side walls, and first to fourth side walls. And an opening 16 that opens the other end of the side wall. The first side wall 11 of the case has an insertion portion 17 that communicates with the inside and outside of the storage space 4. The second side wall 12 of the case faces the first side wall 11 and is arranged so that the suction plate 2 abuts on the outer surface. The microswitch 7 is fixed on the first side wall 11 with the terminal or lead wire 25 exposed from the insertion portion 17 and the actuator 26 facing the second side wall 12 side of the case 3. The yoke 6 includes a drive plate portion 27 that drives the actuator 26. The drive plate portion 27 faces the first side wall with the microswitch 7 interposed between the first side wall 11 of the case and can drive the actuator 26 by approaching and moving away from the first side wall. Composed. The permanent magnet 5 is attracted and fixed on the drive plate portion 27 of the yoke, and has a magnetic force that is attracted to the second side wall 12 together with the yoke 6 when the attraction plate 2 contacts the second side wall 12. A spring 29 is interposed between the drive plate portion 27 of the yoke 6 and the second side wall 12. By this spring 29, the yoke 6 is normally urged toward the first side wall 11 and is held at a position where the actuator 26 of the microswitch 7 is pushed. When the suction plate 2 abuts against the second side wall 12, the magnetic force causes the yoke 6 to compress the spring 29 and be pulled together with the permanent magnet 5 toward the second side wall 12, and the actuator 26 of the microswitch 7 protrudes.

  According to the magnet catch of the invention according to this application, the metal of the suction plate and the yoke do not collide with each other, so that dust generation can be suppressed and use in a clean room is not hindered. Since the actuator and the suction plate do not collide directly, the impact applied to the switch is small and the service life can be extended. Depending on the contact state between the suction plate and the yoke, the operation of the actuator is less affected and the operation of the switch is stabilized. Since the actuator is not exposed from the case, it is possible to prevent water from entering the case from the exposed portion, thereby preventing corrosion of the built-in member.

It is a disassembled perspective view of the magnet catch which concerns on this invention. It is a front view of the magnet catch of FIG. It is a side view of the magnet catch of FIG. It is a top view of the magnet catch of FIG. It is VV sectional drawing in FIG. It is VI-VI sectional drawing in FIG. It is VII-VII sectional drawing in FIG. It is a front view of the magnet catch concerning other embodiments of the present invention. It is IX-IX sectional drawing in FIG. It is XX sectional drawing in FIG. It is a rear view of the state which removed the cover body of the magnet catch of FIG.

Embodiments of the present invention will be described with reference to the drawings.
The magnet catch with a switch includes a main body 1 and a suction plate 2 that magnetically attracts to the main body 1. For example, the main body 1 is fixed to the opening frame of the box, and the suction plate 2 is fixed to its door. When the door is closed, the suction plate 2 is magnetically attracted to the main body 1, and the door is held in a closed state by the suction force.

  The main body 1 of the magnet catch includes a case 3 having a storage space 4 inside, and a permanent magnet 5, a yoke 6, a micro switch 7, and a spacer 8 that are sealed and stored in the storage space 4.

  The case 3 includes a nonmagnetic case main body 9 and a nonmagnetic lid body 10 that closes an opening 16 of the case main body. The case main body 9 includes attachment plate portions 18 on both sides and a central bulging portion 30 and is integrally formed by, for example, drawing of a stainless steel plate. A storage space 4 is formed inside the bulging portion 30. The bulging portion 30 includes first to fourth side walls 11, 12, 13, 14 that surround the four sides of the storage space 4, a fifth side wall 15 that closes one end side of these four side walls, and other side walls. And an opening 16 for opening the end side.

  The first side wall 11 of the case 3 has a rectangular insertion hole 17 that communicates with the inside and outside of the storage space 4. The second side wall 12 of the case faces the first side wall 11 and is arranged so that the suction plate 2 abuts on the outer surface. At the edges of the side walls 13, 14, a mounting plate portion 18 extends perpendicular to the side walls 13 and 14 in parallel with the side wall 15.

  The lid body 10 is integrally formed of an elastic member, and includes a lid plate portion 19 and an inner protruding portion 20. The lid plate portion 19 is fitted into the opening 16 of the case 3 so as to seal it. The inner projecting portion 20 is formed so as to project from the cover plate portion 19 toward the housing space 4 side of the case.

  The inner projecting portion 20 of the lid body 10 is fitted into the switch holding portion 21 that fits and holds the substantially rectangular parallelepiped main body of the microswitch 7 and the insertion hole 17 of the first side wall 11. And a joint portion 22. The fitting portion 22 surrounds the outer periphery of the portion of the main body of the microswitch 7 that protrudes from the insertion hole 17, and is interposed between the insertion hole 17 to hermetically seal between the two.

  The spacer 8 is made of synthetic resin, and is combined with the lid 10 and stored in the storage space 4. The spacer 8 is in close contact with the inner surface of the lid plate portion 19 of the lid body 10 and fits into the opening 16 of the case 3, and the holder 8 protrudes from the support plate portion 23 toward the case storage space 4. And a frame portion 24. The holding frame portion 24 has a rectangular shape in plan view, surrounds and holds the outer periphery of the microswitch 7 body, and the front surface 31 on the protruding side comes into contact with the inner surface of the fifth side wall 15.

  The lid 10 is made of an elastic member and is soft and is in close contact with a portion that contacts the case main body 9 or the microswitch 7 to maintain airtightness. However, the shape retention is low, and the internal housing member is removed from external force. It cannot be protected. On the other hand, the spacer 8 has high rigidity, the support plate portion 23 overlaps the lid body 10, the holding frame portion 24 surrounds the microswitch 7, and the front surface abuts against the side wall 15 of the case body 9. A predetermined distance between the side wall 15 and the lid body 10 is maintained, the microswitch 7 is protected from an external force, and is securely fixed in the accommodation space 4.

  The microswitch 7 is fixed on the first side wall 11 with the terminal or lead wire 25 exposed from the insertion hole 16 and the actuator 26 facing the second side wall side 12 of the case.

  The yoke 6 includes a drive plate portion 27 and a pair of leg portions 28 extending at right angles from both sides of the drive plate portion. The driving plate portion 27 is opposed to the first side wall 11 with the microswitch 7 sandwiched between the first side wall 11 of the case, and moves toward and away from the first side wall 11 to move the actuator 26. It is configured to be drivable. The leg portion 28 extends from both sides of the drive plate portion 27 toward the first side wall 11 along both side surfaces of the microswitch 7.

  The permanent magnet 5 is attracted and fixed on the drive plate portion 27 of the yoke 6, and when the attracting plate 2 comes into contact with the second side wall 12 of the case 3, the magnetic force attracted to the second side wall 12 side together with the yoke 6. Have.

  A spring 29 is interposed between the drive plate portion 27 of the yoke 6 and the second side wall 12. By this spring 29, the yoke 6 is constantly biased toward the first side wall 11, and in this state, the drive plate portion 27 is held so as to push the actuator 26 of the microswitch 7. When the suction plate 2 abuts against the second side wall 12, the yoke 6 compresses the spring 29 and is attracted to the second side wall side 12 together with the permanent magnet 5, and the actuator 26 of the microswitch 7 projects to project the switch. Switches.

  Since the magnet catch with a switch of this embodiment does not collide directly with the metal of the adsorption | suction board 2 and the yoke 6, dust generation can be suppressed and it is suitable for the use in a clean room. Since the actuator 26 and the suction plate 2 do not collide directly, the impact applied to the switch 7 is small, and the service life can be extended. If the suction plate 2 approaches the main body 1 to a predetermined distance, the yoke 6 moves reliably regardless of the posture of the suction plate 2 (even when the door is incompletely closed due to an incompletely closed state). Thus, since the actuator 26 is reliably operated, the operation of the switch 7 is stabilized. Since the actuator 26 is not exposed from the case 3, it is possible to prevent water from entering the case from the exposed portion, thereby preventing corrosion of the built-in member.

  8 to 11 show other embodiments. The same components as those of the previous embodiment are denoted by the same reference numerals and description thereof is omitted.

  In this embodiment, the case body 9 and the lid body 10 are each molded with a synthetic resin. A support piece 30 that supports the yoke 6 extends in parallel with the side wall 11 inside the side walls 13 and 14 of the case body 3. The yoke 6 is always held on the support piece 32 by the spring 29, and the actuator 26 of the microswitch 7 is pushed in this state.

DESCRIPTION OF SYMBOLS 1 Magnet catch main body 2 Adsorption plate 3 Case 4 Storage space 5 Permanent magnet 6 Yoke 7 Micro switch 8 Spacer 9 Case main body 10 Cover body 11 First side wall 12 Second side wall 13 Third side wall 14 41st side wall 15 Fifth side wall 16 Opening 17 Insertion hole 18 Mounting plate portion 19 Lid plate portion 20 Inner protruding portion 21 Switch holding portion 22 Fitting portion 23 Support plate portion 24 Holding frame portion 25 Lead wire 26 Actuator 27 Drive plate portion 28 Leg portion 29 Spring 30 bulge 31 front 32 support piece

Claims (4)

A main body fixed to one of the two members to be joined and detached, and a suction plate fixed to the other member and magnetically attracted to the main body when joined to the other member;
The main body includes a non-magnetic case having a storage space inside, and a permanent magnet, a yoke, and a micro switch that are sealed and stored in the storage space.
The case includes a case body that is integrally molded, and a lid that closes the opening of the case body.
The case body opens first to fourth side walls that surround the four sides of the storage space, a fifth side wall that closes one end side of the four side walls, and the other end side of the first to fourth side walls. Comprising the opening,
The first side wall of the case has an insertion portion that communicates with the inside and outside of the storage space,
The second side wall of the case is disposed so as to face the first side wall and the suction plate abuts on an outer surface.
The microswitch is fixed on the first side wall by exposing a terminal or a lead wire from the insertion portion and directing the actuator toward the second side wall of the case.
The yoke is configured to be able to drive an actuator by facing the first side wall with the micro switch sandwiched between the yoke and the first side wall of the case, and approaching and moving away from the first side wall. It has a plate part,
The permanent magnet is attracted and fixed on the drive plate portion of the yoke, and has a magnetic force attracted to the second side wall side together with the yoke when the attraction plate abuts on the second side wall.
A spring is interposed between the drive plate portion of the yoke and the second side wall, so that the yoke is always urged toward the first side wall and is held in a position to push in the actuator of the micro switch. When the suction plate comes into contact with the second side wall, the yoke compresses the spring and is pulled together with the permanent magnet to the second side wall side so that the actuator of the microswitch protrudes. Magnetic catch with switch.   The yoke is configured to be able to drive an actuator by facing the first side wall with the micro switch sandwiched between the yoke and the first side wall of the case, and approaching and moving away from the first side wall. The switch according to claim 1, further comprising: a plate portion; and a pair of legs extending from both sides of the drive plate portion along the both side surfaces of the microswitch toward the first side wall. magnet catch. The lid body is made of an elastic member, and a lid plate portion that is fitted into the case so as to seal the opening in the case, and a lid plate that protrudes from the lid plate portion toward the storage space of the case An inner protrusion formed integrally with the portion,
The inner projecting portion includes a switch holding portion that fits and holds the microswitch body, and a fitting portion that closely fits the insertion portion of the first side wall,
The fitting portion surrounds the outer periphery of the protruding portion from the insertion portion of the first side wall in the micro switch, and is interposed between the insertion portion and the micro switch so as to hermetically seal between the two. The magnet catch with a switch according to claim 1 characterized by things. In the housing space of the case, a synthetic resin spacer for holding the microswitch in a predetermined position is stored in combination with the lid,
The spacer includes a support plate portion that is in close contact with the lid plate portion of the lid body and fits into the opening of the case, and a holding frame that protrudes from the support plate portion toward the case storage space and surrounds the outer periphery of the microswitch. The magnet catch with a switch according to claim 3, wherein the magnet catch includes a switch.

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