JPH1064360A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly versatile switch by which manufacturing performance can be improved with simple constitution and which has high durability and by which highly accurate detection can be easily performed. SOLUTION: A moving part 30 in which a steel ball 32 and a magnet part 37 are arranged from the body part 4 side of a main body part 3 installed in an assembling jig, is inserted from the steel ball 32 side. The moving part 30 is put in a position retreated by a prescribed distance in the main body part 3. A pedestal part 11 in which a reed switch device 20 and a coil spring 28 are installed are temporarily fastened by fitting and inserting the reed switch 21 side from the body part 4 side of the main body part 3. After a connector is connected to a detecting device, a retaining ring metal fitting 15 is pressed in the body part 4 of the main body part 3 together with the pedestal part 11 from a surface on the opposite side of the side where claw parts 17 and 17 incline. Press-in is stopped in a position detecting that a reed switch 21 of the detecting device is closed, and it is positioned and fixed. It is removed from the assembling jig 40, and a filler 27 is filled by covering the retaining ring metal fitting 15, and a switch main body 1 is assembled and formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch that opens and closes when a sphere moves forward and backward.

[0002]

2. Description of the Related Art Conventionally, as this type of switch, for example, Japanese Patent Application Laid-Open No.
The configuration described in Japanese Patent Publication No. 187030 is known.

A switch described in Japanese Patent Application Laid-Open No. 62-122015 is a switch for opening and closing the contact portions in conjunction with the pressing operation of a steel ball as a sphere in a bottomed cylindrical metal cover. The part is slidably mounted. Then, at the base end of the shaft of the moving portion, a seating surface of a returning spring supported by a seating surface provided on the plunger is formed, and the returning spring is inserted into this portion. Form the bearing surface of the biasing spring of the contact piece, b
An engaging step portion for receiving the movable contact piece at the time of the contact type is formed, and a support portion for slidably supporting the movable contact piece is formed, and the movable contact piece is supported on this portion, and the outer end of the support portion On the side, there is provided a detachable locking member that restricts the position of the movable contact piece urged by a biasing spring from the base end side in the a contact type and removes the movable contact piece in the b contact type. Also, the movable contact piece and the a-contact type are separated from the outer surface when the plunger is formed with the seating surface of the biasing spring for the b-contact type inside the seat surface of the return spring. A pair of terminal plates having an L-shape that comes into contact with and separated from each other are implanted at positions corresponding to each contact type so as to be selectively set.
In the case of the contact type, a biasing spring is interposed between the seating surface of the biasing spring of the movable contact piece of the moving part and the movable contact piece supported by the support and received by the locking member. An urging spring is interposed between the movable contact piece supported by the support of the moving part and received on the inner surface of the L-shaped terminal plate and the seating surface of the urging spring for the b-contact type of the terminal base. The configuration is adopted.

[0004] However, Japanese Patent Application Laid-Open No.
In the device described in JP-A No. 15, the contact is brought into and out of contact by sliding movement of the moving unit. Therefore, when a pressing operation for further moving the moving unit is performed after the contact comes into contact, the contact or the moving unit, The terminal base may be damaged. In addition, contact damage of the contact portion due to contact and separation of the contact occurs, and the increase in durability is also restricted. Further, in order to hold the steel ball between the opening edge of the metal cover whose diameter is reduced and the moving portion, when the steel ball is pressed down to move the moving portion, the steel ball and the metal member are moved. Open between the opening edge of the cover,
The foreign matter can enter, and if the foreign matter enters, the foreign matter may be caught between the steel ball and the opening edge of the metal cover, which may cause a malfunction that the contact remains in contact. is there.

On the other hand, the switch described in Japanese Utility Model Laid-Open Publication No. 59-187030 has a movable contact movable along the axial direction of the main body at one end of a substantially cylindrical main body having both ends opened. There is provided a switch unit having a first coil spring for urging a contact that is short-circuited and closed by contact of the contact and a movable contact at all times to separate the contact from the contact. Also,
A moving part having a housing for rotatably holding a steel ball at one end is slidably accommodated in the main body. The steel ball of the moving portion is movably housed by being urged by the first coil spring in a direction protruding from the opening at the other end of the main body. Further, a second coil spring having an urging force stronger than the urging force of the first coil spring is provided in the moving portion, and the second coil spring is moved in the direction in which the steel ball moves backward in the moving direction. An operator that moves by the urging force and moves the movable contact of the switch unit against the urging of the first coil spring is housed at the distal end.
When the movable contact comes into contact with the contact and the movement is restricted, when a force for moving the moving part is applied, the operating member relatively moves against the urging force of the second coil spring. It is provided movably in the moving part so as to move backward in the part.

However, Japanese Utility Model Application Laid-Open No. 59-1870
The device described in Japanese Patent Publication No. 30 is operated even when a force for moving the movable portion is applied after the movable contact and the contact of the switch portion are brought into contact and closed by the sliding movement of the movable portion and the movement of the movable contact is regulated. Although the switch unit can be prevented from being damaged by moving the child, the movable range of the moving unit can be set wide. However, it is necessary to separately provide an operation element, and the first element having a different urging force is required.
It is difficult to set the balance between the biasing forces of the coil spring and the second coil spring, which causes a decrease in productivity and an increase in cost. The biasing force of the coil spring moves backward in the moving portion against the biasing force of the second coil spring, and the movement of the moving portion due to a variation in the biasing force or a change in balance due to a decrease in the biasing force during use. The relationship between the moving distance and the closing of the switch section is different, and it is difficult to obtain highly accurate detection. Further, similar to the one described in Japanese Patent Application Laid-Open No. 62-122015, the contact portions come into contact with and separate from each other, resulting in fatigue damage of the contact portions, and the increase in durability is also restricted.

[0007]

As described above, in the conventional switch described in Japanese Patent Application Laid-Open No. 62-122015, the contacts are brought into and out of contact by the sliding movement of the moving part, so that the durability is increased. However, the moving range of the moving part where each part is not damaged is limited, the versatility is limited, and a malfunction may occur due to invasion of foreign matter. Further, in the conventional switch described in Japanese Utility Model Laid-Open No. 187030/1984, a plurality of coil springs having different urging forces are provided in order to prevent damage to the switch section even if the moving section moves further after the contacts are closed. In addition, the relationship between the moving distance of the moving unit and the opening and closing of the switch may be changed due to the balance of the urging force of the coil spring, and it is difficult to obtain highly accurate detection.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a highly versatile switch that has a simple configuration, has high durability, and can perform highly accurate detection.

[0009]

According to a first aspect of the present invention, there is provided a switch having a substantially cylindrical main body having an opening at both ends and having a retaining portion having a small diameter protruding inward on an inner peripheral surface thereof. A pedestal portion fitted to one end of the main body, an elongated rod-shaped reed switch having one end fixed to the pedestal, and an opening at one end of the main body provided at one end of the main body. A positioning member for positioning the pedestal portion so as to be insertable and immovable in a direction toward an opening on one end side of the main body portion; A housing that is provided at a distal end portion that advances and retreats from the portion and rotatably holds a sphere; a housing portion that is provided at a base end side and into which the reed switch can be inserted; A moving part having a restricting part for restricting the projection of the housing, Urging means provided between the base and the moving part for urging the moving part in a direction protruding from an opening on one end side of the main body part; and urging means for the urging means provided on the moving part. A magnet unit for opening and closing the reed switch when the moving unit retreats into the main body unit, and a moving unit that holds a sphere in a housing rotatably in advance through an opening provided at one end. With the sphere inserted into the substantially cylindrical main body so as to be able to advance and retreat, and with the moving part held at a position retracted by a predetermined distance, the pedestal part to which one end of the elongated rod-shaped reed switch is fixed is connected to the moving part. With the biasing means interposed between the reed switch and the body, inserted into the main body, and the bias of the biasing means is adjusted to the position where the reed switch is closed or opened by the magnetism of the moving part. Positioning member against Both are inserted into the main body and the pedestal is positioned and fixed.Since it is simply inserted into the position where the reed switch opens and closes according to the moving distance of the moving unit, a normally open type or normally closed type can be selected as appropriate. It is easy to set the moving distance of the moving part and opening and closing of the reed switch, improving manufacturability and obtaining high accuracy detection, and using a non-contact type reed switch makes it more fatigue than the contact type Damage is reduced and durability is improved,
Since the moving unit is provided with a housing into which the reed switch can be relatively inserted, the moving unit can be further moved after the reed switch is opened and closed, so that the movable range of the moving unit is widened and versatility is increased.

According to a second aspect of the present invention, in the switch according to the first aspect, the moving portion is formed of a synthetic resin containing a magnetic material, and the magnet portion magnetizes at least a part of the moving portion. This eliminates the need to provide a separate magnet, reduces the number of components, simplifies the structure, and improves manufacturability.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a switch according to an embodiment of the present invention will be described below with reference to the drawings.

1 to 4, reference numeral 1 denotes a switch body used for a brake system of a vehicle, for example.
The switch main body 1 has a substantially cylindrical main body 3 made of metal such as stainless steel and having openings 2a and 2b at both ends.
In the main body 3, a substantially cylindrical body 4 and a substantially cylindrical mounting part 5 having an inner diameter smaller than the body 4 are formed substantially coaxially and integrally. The end of the small-diameter mounting portion 5 on the side of the body 4 becomes a retaining portion 6 in a state of protruding from the inner surface of the body 4, and the end surface of the retaining portion 6 facing the body 4 becomes the contact surface 7. The outer end face of the body part 4 on the mounting part 5 side becomes the reference plane 8. A male screw portion 9 is provided on the outer peripheral surface of the mounting portion 5, and the outer peripheral surface of the body portion 4 on the mounting portion 5 side is substantially engaged with a tool (not shown) for rotating the main body 3 around a central axis as a rotation axis. It is formed in a regular hexagonal column shape.

An opening 2a at one end is provided in the main body 3.
A pedestal portion 11 is fitted and fixed in a position inside the body portion 4 on the side opposite to the mounting portion 5. The pedestal portion 11 includes a substantially cylindrical terminal base portion 12 made of a synthetic resin or the like, and
A substantially cylindrical holding portion 13 which is provided substantially coaxially on one end side and has a smaller diameter than the terminal block portion 12 is integrally formed. And
The pedestal portion 11 is inserted into the main body 3 from the holding portion 13 side. Further, a snap ring fitting 15 as a positioning member is fitted and fixed at an end of the pedestal section 11 facing the opening 2a on one end side of the main body section 3. This snap ring fitting 15
A plurality of claw portions 17 protruding outward in a substantially oblique direction from an outer peripheral edge of a ring-shaped annular portion 16 abutting on an end of the terminal base portion 12 of the pedestal portion 11;
17 is formed of a steel plate for spring, for example,
It has a one-way characteristic that it can be inserted in the direction opposite to the inclined side of 17, 17 and cannot move in the direction of the inclined side of the claws 17, 17. And this snap ring metal fitting 15 is
7 and 17 are inserted into the main body 3 so that the inclined side is the opening 2a on one end side of the main body 3, and the tips of the claws 17 and 17 are engaged with the inner peripheral surface of the main body 3. The pedestal 11 is fixed so as not to move in the direction of one end by this fixation.

A reed switch device 20 is attached to the pedestal portion 11. This reed switch device
Reference numeral 20 denotes a substantially elongated rod-shaped reed switch 21, and a pair of terminals 23 provided integrally with one end of the reed switch 21 and electrically connected to a pair of contacts 22 of the reed switch 21, respectively. And a terminal 24. In the reed switch device 20, the terminal portion 24 is accommodated in the terminal base portion 12 of the pedestal portion 11, the reed switch 21 is inserted and fixed in the holding portion 13 of the pedestal portion 11, and the reed switch 21 is connected to the pedestal portion. It is mounted so that it projects substantially coaxially from 11. Furthermore, terminals 23 of the terminal section 24,
Lead wires 25 are respectively connected to 23 via the inside of the annular portion 16 of the snap ring fitting 15, and a connector 26 is attached to the tip of each of the lead wires 25, 25. If the connector 26 is too large to be inserted through the annular portion 16 of the snap ring 15, the snap ring 15 must be connected before the connector 26 is connected to the lead wire.
Lead wires 25, 25 are inserted through
26 is attached to the ends of the lead wires 25 and 25.

Further, on one end side of the main body 3, lead wires 25, 25 covering the snap ring fitting 15 are connected to an opening 2 a on one end side of the main body 3.
And a filler 27 such as an epoxy resin.

On the other hand, reference numeral 28 denotes a coil spring as an urging means.
And is disposed in the main body 3 so that the reed switch 21 is inward on the central axis.

A moving unit 30 is provided in the main body 3. The moving part 30 is made of a high-rigidity synthetic resin and has an outer diameter substantially the same as the inner diameter of the mounting part 5 of the main body part 3, and the reed switch 21 can be inserted into the center axis. An accommodating recess 31 as a large-diameter accommodating portion is formed in a substantially bottomed cylindrical shape that is open at one end, which is the base end. In addition, a housing 33 that opens in the axial direction and rotatably holds a steel ball 32 as a sphere is integrally formed at the other end of the moving unit 30 that is the front end side on the side where the housing recess 31 is not open. Is provided. The inner peripheral surface of the housing 33 has a steel ball 32
A groove 34 for interposing a lubricant or the like is formed between the groove 34 and the outer peripheral surface. Further, on the outer peripheral surface of the moving portion 30, the outer diameter of the body portion 4
There is provided a restricting portion 35 which protrudes in a flange shape in the outer peripheral direction so as to have substantially the same size as the inner diameter of.

The axial dimension of the housing concave portion 31 of the moving portion 30 is such that the steel ball 32 is completely retracted into the main body portion 3 and the coil spring 28 interposed between the steel ball 32 and the pedestal portion 11 is completely crushed. The end of the reed switch 21 is set so as not to come into contact with the end surface of the housing recess 31 of the moving unit 30 even if the moving unit 30 moves near the closed state.

Further, an annular magnet portion 37 is inserted between the end surface of the regulating portion 35 and the end surface of the moving portion on the outer peripheral surface of the end of the moving portion 30 on the side where the housing recess 31 is opened. Fixed. The end face of the magnet part 37 constitutes the end face of the moving part 30 which is continuous with the end face of the moving part 30 in one plane and the other end of the coil spring 28 comes into contact with. And this magnet part 37
Opens and closes the reed switch 21 by the movement of the moving unit 30. Note that the magnet section 37 may be attached with an adhesive or the like.

Next, the assembling operation of the above embodiment will be described.

First, the reed switch 21 is always open, and the reed switch 21 is closed by the movement of the moving unit 30, that is, the normally open type switch body 1, that is, the off-on type switch body 1.
Will be described.

A steel ball 32 is rotatably held in a housing 33 provided at one end of the moving unit 30 in advance.
The magnet section 37 is fitted and fixed to the outer peripheral surface of the other end of the moving section 30. Further, the reed switch device 20 is assembled on the pedestal portion 11. Further, one end of the coil spring 28 is a pedestal portion.
The coil spring 28 is fitted from the reed switch 21 side until it comes into contact with the end surface of the eleventh part 11 and is attached to the holding part 13 of the pedestal part 11.

On the other hand, as shown in FIG. 2, the main body 3 is attached to a jig 40 for assembly. That is, the jig 40 for assembly is attached to the mounting portion 5 of the main body 3 on the substantially plate-shaped holding plate 41.
And a substantially plate-shaped positioning plate 43 that faces the holding plate 41 with a predetermined distance therebetween so as to cover the female screw portion 42. The female screw portion 42 of the holding plate 41 is provided with the reference surface 8 of the main body 3.
The male screw part 9 of the mounting part 5 of the main body part 3 is screwed and attached until the abutment with the holding plate 41.

Then, the moving part 30 provided with the steel ball 32 and the magnet part 37 is inserted from the steel ball 32 side through the opening 2a on the body part 4 side of the main body part 3. The inserted state of the moving part 30 is
32 comes into contact with the positioning plate 43 of the jig 40 for assembly, and the moving unit 30 is set in the main body 3 by a predetermined distance, for example, 1.5 mm.

Next, the pedestal 11 to which the reed switch device 20 and the coil spring 28 are mounted is inserted to some extent on the reed switch 21 side from the opening 2a on the body 4 side of the main body 3. Then, the connector 26 is connected to a detection device (not shown) so that the open / closed state of the reed switch 21 can be detected in a temporarily fixed state in which the pedestal portion 11 is inserted to the extent that the pedestal portion 11 does not fall off the main body portion 3.

Thereafter, the snap ring fitting 15 is inserted into the opening 2a of the main body 3 on the side of the body 4 from the surface opposite to the side where the claws 17, 17 are inclined to resist the elasticity of the claws 17, 17. And press in with the pedestal 11. Then, when the detection device detects that the reed switch 21 is in the closed state, the press fitting of the snap ring fitting 15 is stopped, and the pedestal portion 11 is stopped.
Is positioned and fixed. That is, the claw portion 1 of the snap ring fitting 15
The snap ring fitting 15 is inserted into the main body 3 in such a state that the tips of the claws 17, 17 bite into the inner peripheral surface of the main body 3 by the elastic force of 7, 17.
Is fixed, and since the retaining ring 15 has a unidirectionality, the retaining ring 15 and the pedestal 11 do not move again toward the opening 2a of the main body 3 on the body 4 side.

It should be noted that the closing of the reed switch 21
When the jig 40 for assembly is set to correspond to the movement distance of 30, for example, when the reed switch 21 is closed when the moving unit 30 moves 3 mm into the main body 3, the jig for assembly is used. Between the holding plate 41 and the positioning plate 43 of the tool 40,
What is necessary is just to set in the main-body part 3 so that the moving part 30 may hold | maintain at the position retracted 3 mm.

Then, it is detached from the jig 40 for assembling, and the retaining ring fitting 15 is inserted into the opening 2a of the main body 3 on the side of the body 4.
The switch body 1 is assembled by filling a filler 27 such as an epoxy resin in a state where the lead wires 25 and 25 are drawn out from the opening 2a of the main body 3 while covering the lead body 25.

Next, the operation of the switch body will be described.

For example, as shown in FIG. 5, the switch body 1 is disposed so as to be substantially perpendicular to the axial direction on the rod-shaped body 51 which is the object to be detected that moves along the axial direction. The male screw part 9 of the part 5 is screwed into the female screw part 53 provided in the vehicle body constituent part 52 until the reference surface 8 of the main body part 3 comes into contact, and the steel ball 32 is attached to the inclined surface 54 provided on the moving rod 51.
Are arranged facing each other.

When the inclined surface 54 of the moving rod 51 comes into contact with the steel ball 32 and the rod 51 further moves, the inclined surface 54 moves.
, The steel ball 32 is moved back into the main body 3.
In addition, since the steel ball 32, which is a spherical body, is rotatably held by the moving unit 30, the steel ball 32 rotates regardless of the direction in which the rod-shaped body 51 is moved, so that the rod-shaped body 51 moves. It is transmitted to the moving unit 30 smoothly. The urging of the steel ball 32 due to the movement of the rod-shaped body 51 is opposed to the urging of the coil spring 28.
The moving unit 30 having a housing 33 at one end where the housing 32 is held is moved. When the moving unit 30 moves within a predetermined distance, for example, the 1.5 mm main body unit 3 set at the time of manufacturing, the magnet unit 37 provided at the other end of the moving unit 30 magnetizes the moving unit 30.
The reed switch 21 is closed. The closing of the reed switch 21 detects that the brake has been operated.

Next, the reed switch 21 is always closed, and the reed switch 21 is opened by the movement of the moving unit 30, that is, the normally-closed type switch body 1.
Will be described.

In the same manner as the above-described assembling operation of the off-on type switch body 1, a steel ball is previously inserted through the opening 2 a on the body 4 side of the body 3 attached to the assembly jig 40.
The moving part 30 provided with 32 and the magnet part 37 is inserted from the steel ball 32 side. Note that the assembling jig 40 is located at a position where the steel ball 32 abuts against the positioning plate 43 of the assembling jig 40 and the moving unit 30 is retracted within the main body 3 by a predetermined distance, for example, 1.5 mm. Thus, the space between the holding plate 41 and the positioning plate 43 is set in advance.

Then, the reed switch device 20
The pedestal 11 to which the coil spring 28 is attached is inserted into the reed switch 21 to some extent from the opening 2a of the main body 3 on the body 4 side. Then, the connector 26 is connected to a detection device (not shown) so that the open / closed state of the reed switch 21 can be detected in a temporarily fixed state in which the pedestal portion 11 is inserted to the extent that the pedestal portion 11 does not fall off the main body portion 3.

Thereafter, the snap ring fitting 15 is inserted into the opening 2a of the body 3 on the side of the body 4 from the side opposite to the side where the claws 17, 17 are inclined to resist the elasticity of the claws 17, 17. And press in with the pedestal 11. Then, when the detection device detects that the reed switch 21 is in the closed state, and further press-fits and detects that the reed switch 21 is in the opened state again, it stops. Wheel bracket 15
Is stopped, and the pedestal portion 11 is positioned and fixed by engaging and fixing the claw portions 17, 17 of the retaining ring fitting 15. After that, a filler 27 such as an epoxy resin is filled in the same manner to assemble and form the switch body 1.

According to the above-described embodiment, the pedestal 11 to which the reed switch device 20 is attached is inserted into the main body 3 together with the one-way snap ring fitting 15 for positioning and holding.
A coil spring is located between the pedestal 11
The movable portion 30 having the housing 33 rotatably holding the steel ball 32 with which the rod-shaped body 51 abuts is interposed with the steel ball 32 by the urging of the coil spring 28 so that the steel ball 32 is opened at one end of the main body 3.
The pedestal portion 11 is slidably housed in the main body portion 3 so as to be able to advance and retreat from 2b. In order to open and close the reed switch 21 provided, simply insert the reed switch 21 in the position where the reed switch 21 opens and closes in a simple configuration corresponding to the moving distance of the moving unit 30. The switch body 1 that can perform high-precision detection without using or removing the switch body can be easily manufactured,
The relation between the moving distance of the moving part 30 and the opening and closing of the reed switch 21 corresponding to the moving state of the rod 51 is determined by the pedestal part to which the reed switch device 20 provided with the snap ring fitting 15 is attached.
It can be easily set according to the insertion amount of 11 and can improve manufacturability and versatility.

Also, the housing recess 31 into which the reed switch 21 can be relatively fitted is provided in the moving part 30 so that the end of the reed switch 21 does not come into contact even when the moving part 30 moves.
The relationship between the moving distance of the moving unit 30 and the opening and closing of the reed switch 21 can be easily set, and after the opening and closing of the reed switch 21, the moving unit 30 can be moved further so that the reed switch 21 does not come into contact with the contact. In the conventional contact type that opens and closes, the moving part cannot move further than the state where the contacts are joined, and the moving range is limited.
The moving range of the moving unit 30 can be increased with a simple configuration in which the moving recess 30 is formed into a substantially cylindrical housing recess 31. For example, the reed switch 21 is turned on from the off state by moving the moving unit 30. It can also be set to the off state, it can prevent damage due to the contact between the moving part 30 and the reed switch 21, can cope with the moving state of the rod 51 that is different, and easily open and close the reed switch 21. Can be changed and set, and versatility can be improved.

Further, the edge of the opening 2b at the end where the end of the moving portion 30 of the main body 3 advances and retracts is not formed by reducing the diameter as in the conventional case, and the moving portion 30 holding the steel ball 32 advances and retreats. Main body 3 possible
Is formed in a cylindrical shape, and the stopper of the moving part 30 from the opening 2b of the main body part 3 is prevented by providing the stopper part 6 in the main body part 3 and the regulating part 35 in contact with the retaining part 6 in the moving part 30. When the moving unit 30 retreats into the main body 3, even if foreign matter such as dust or metal powder enters through the opening 2 b at the end of the main body 3, the moving unit 30 returns to the original position. At the end of the moving part 30, foreign matter is discharged so as to be pushed out from the opening 2b of the main body part 3. Therefore, when the steel ball 32 returns to its original position in a conventional diameter reducing device, the steel ball 32
The steel ball 32 cannot be returned to the original position due to the interposition of a foreign object between the steel ball 32 and the opening edge of the main body. It is also possible to prevent the edge of the opening 2b of the main body 3 from being damaged.

Further, since the non-contact type reed switch 21 is used, there is no fatigue damage of the contact portion due to repetition of contact and separation of the contact caused by the conventional contact type which is opened and closed by contact and separation of the contact, and the durability is improved. it can.

Then, the steel ball 32 which holds the steel ball 32 and has good abrasion resistance, for example, is formed of nylon or the like.
Since the steel ball 32 is rotated without backlash by attaching the magnet part 32, which is a magnet,
The wear of the switch 33 can be prevented, the detection position accuracy as a switch can be increased and the reliability can be improved, and the reliability can be improved because no other members are used.

In the above embodiment, the moving unit 30
In the above description, the annularly formed magnet portion 37 is attached, but may be provided integrally. That is, for example, a magnetic material such as strontium (Sr) -ferrite sized to a powder of 200 mesh or less is mixed with a synthetic resin such as nylon as appropriate and injection molded, and the end opposite to the housing 33 is magnetized. Thus, the moving unit 30 having the magnet unit 37 at the end may be formed. According to this configuration, the number of parts can be reduced, and assembling manufacturability can be improved.

Further, a plurality of magnet portions 37 may be provided. According to this configuration, the reed switch 21 can be opened and closed a plurality of times by moving the moving unit 30, and for example, by detecting the opening and closing interval time of the reed switch 21, the detection status such as the moving speed of the moving unit 30 is also detected. can do.

The positioning member for positioning the pedestal 11 is not limited to the snap ring 15, but can be inserted into the main body 3 but positioned so as not to fall off by the bias of the coil spring 28 as the biasing means. Any one-way configuration, such as a configuration in which a plurality of claws or the like are provided on the inner peripheral surface of the main body 3 and which are inclined in the insertion direction side of the pedestal 11 such as a downer, etc. The unit 3 may be configured. According to this configuration, although the manufacturability of the main body portion 3 is reduced, it is not necessary to use the snap ring fitting 15 as a separate member, the number of parts can be reduced, and the assembling manufacturability can be improved.

On the other hand, a plurality of reed switches 21
May be arranged so that the operating position is different in the axial direction of the main body 3. According to this configuration, it is possible to detect a detection state such as the moving speed of the moving unit 30 as in the case where a plurality of magnet units 37 are provided.

The jig 40 for assembly is preferably formed to have a thickness in which the end surface of the main body 3 is continuous with one surface of the holding plate 41 when the main body 3 is attached. According to this configuration, the distance between the holding plate 41 and the positioning plate 43 for setting the position by contacting the steel ball 32 is equal to the distance for holding the moving unit 30 by retracting to the predetermined position in the main body 3. This makes it easy to set the distance between the positioning plate 43 and the holding plate 41, thereby improving manufacturability.

On the other hand, the main body 3 is connected to the body 4 having different diameters.
The mounting portion 5 is formed integrally on the same axis to form the retaining portion 6, and the regulating portion 35 is formed on the outer peripheral surface of the moving portion 30 in a flange shape.
However, the main body 3 is formed in a cylindrical shape in which the body portion 4 and the mounting portion 5 have substantially the same diameter, and the stopper portion 6 is formed on the inner peripheral surface in a claw shape inward. Moving part to this retaining part 6
Any configuration can be adopted in which the contact of the moving unit 30 with the moving unit 30 restricts the moving unit 30 in the protruding direction.

The urging means is not limited to the coil spring 28, but may be any means for urging the moving portion 30 in a direction in which the moving portion 30 projects from the main body 3.

Further, the sphere is not limited to the steel ball 32 but may be any sphere formed of hard synthetic resin or ceramics.

[0049]

According to the switch of the first aspect, the moving portion holding the steel ball rotatably in the housing is inserted into the substantially cylindrical main body so that the steel ball can advance and retreat, and this moving portion is moved by a predetermined distance. In a state where the reed switch is held at the retracted position, a pedestal portion to which one end of the reed switch that can be relatively inserted into the housing of the moving portion is fixed, and a biasing means is interposed between the reed switch and the reed switch. From the side and inserted into the main body together with the positioning member against the urging of the urging means to the position where the reed switch is closed or opened by the magnetism of the moving part. The pedestal is positioned and fixed, so that it can be easily manufactured by simply inserting it into the position where the reed switch opens and closes in accordance with the moving distance of the moving unit. Reed switch by moving distance Opening and closing can be easily set, manufacturability is improved, high-precision detection is obtained, and non-contact reed switches are used, so fatigue damage is reduced compared to contact types and durability can be improved. After the reed switch is opened and closed, the moving unit can be further moved, so that the movable range of the moving unit is widened and versatility can be increased.

According to the switch of the second aspect, in addition to the effect of the switch of the first aspect, at least a part of the moving portion formed of a synthetic resin containing a magnetic material is magnetized to move the magnet portion. Since it is formed integrally with the part, it is not necessary to use a separate magnet, the number of parts can be reduced, the structure is simple, and the manufacturability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a switch of the present invention.

FIG. 2 is an explanatory diagram showing a closed state of a reed switch of the switch body.

FIG. 3 is a front view showing the switch body.

FIG. 4 is an explanatory view showing a state in which a snap ring of the switch body is attached.

FIG. 5 is an explanatory diagram showing a state where the switch body is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switch main body 2a, 2b opening 3 Main body part 6 Retaining part 11 Pedestal part 15 Retaining ring metal fitting as a positioning member 21 Reed switch 28 Coil spring as urging means 30 Moving part 32 Steel ball as a sphere 33 Housing 31 As a housing part Accommodation recess 35 Regulator 37 Magnet

Claims (2)

[Claims] 1. A substantially cylindrical main body portion having a retaining portion having a small diameter protruding inward from an inner peripheral surface and having both ends opened, and a pedestal portion fitted to one end of the main body portion. An elongated rod-shaped reed switch having one end fixed to the pedestal; and one end of the main body provided at one end of the main body and capable of fitting the pedestal through an opening at one end of the main body. A positioning member for positioning so as not to be movable in the direction toward the opening on the side; and The housing includes a housing that is freely held, a housing portion provided on the base end side and into which the reed switch can be inserted, and a restricting portion that protrudes from the outer peripheral surface and contacts the retaining portion to restrict the protrusion of the housing. Moving part, provided between the pedestal part and the moving part. Urging means for urging the moving part in a direction protruding from an opening on one end side of the main body part; and the moving part provided in the moving part to move the moving part into the main body part against the urging of the urging means. A switch for opening and closing the reed switch when retracted. 2. The moving part according to claim 1, wherein the moving part is formed of a synthetic resin containing a magnetic material, and the magnet part is formed by magnetizing at least a part of the moving part. switch.