JP2554653Y2 - Push button switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button switch which is turned on (or turned off) when a push button is pressed once, and turned off (or turned on) when pressed again.

[0002]

2. Description of the Related Art Conventionally, as this type of push button switch, a push button 1 provided with a movable contact 2 as shown in FIGS. 6 and 7 is known. That is, the push button 1 has its first inner peripheral surface 1a fitted to the guide surface 3a of the housing 3 so as to be movable in the axial direction. It is biased upward. The movable contact 2 is provided at a lower end portion of a sleeve (moving member) 5 fitted to the second inner peripheral surface 1b of the push button 1 so as to be movable in the axial direction. Also,
The housing 3 has a position facing the movable contact 2,
A fixed contact 6 is provided.

The sleeve 5 is urged downward in the figure by a second spring 7 so that the movable contact 2 comes into contact with the fixed contact 6 when it moves downward.
However, the second spring 7 is substantially extended when the push button 1 is not pressed, that is, in the OFF state, and the force for pressing the movable contact 2 against the fixed contact 6 is substantially zero. The movable contact 2 is provided with a cylindrical rubber contact 8 so as to surround the movable contact 2, and the rubber contact 8 is provided with a second spring 7.
When the urging force is substantially zero, the movable contact 2 is held so as not to contact the fixed contact 6. Further, the push button 1 is provided with a heart cam (not shown), and the housing 3 is provided with a pin 9 which operates along the outer periphery of the heart cam.

[0004] The heart cam is constituted by a plate-like cam having a concave portion on the upper side in the figure. When the push button 1 is pushed downward, the pin 9 relatively moves upward along the outer periphery of the heart cam and is locked in the concave portion of the heart cam, and holds the push button 1 in a state where the push button 1 is pushed by a predetermined amount. At the same time, when the push button 1 is further pushed in again, the push button 1 is released from the recess of the heart cam, and the push button 1 is set in a free state.

[0005] In the push button switch configured as described above, when the push button 1 is pressed from the OFF state, the first button is pressed.
The spring 4 and the second spring 7 are compressed, and the urging force of the second spring 7 causes the sleeve 5 to move downward. Then, the rubber contact 8 bends and the movable contact 2 comes into contact with the fixed contact 6. Further, in this state, the pin 9 is locked in the concave portion of the heart cam, and the push button 1 is held in a depressed state, so that the contact is maintained in the ON state.

Next, when the push button 1 is pressed again, the first spring 4 and the second spring 7 are further slightly bent, and the pin 9 comes off from the concave portion of the heart cam. Then, the first spring 4 and the second spring 7
The push button 1 moves upward due to the repulsive force of
The spring 7 is almost completely extended, the force for urging the movable contact 2 downward is lost, and the resilient force of the rubber contact 8 separates the movable contact 2 from the fixed contact 6. That is, the contact is turned off.

[0007]

However, in the above conventional push button switch, the sleeve 5 is connected to the push button 1.
And the push button 1 is attached to the housing 3, so that the fitting tolerance A between the first inner peripheral surface 1a and the guide surface 3a and the fitting between the second inner peripheral surface 1b and the sleeve 5 The sleeve 5 moves with a fitting tolerance of the size of A + B obtained by accumulating the tolerance B. For this reason, the sleeve 5 tends to move with a large inclination, and the movable contact 2 and the fixed contact 6
Inevitably, it is inevitable that the contact is made with a large inclination, and there is a problem that poor contact easily occurs.

The present invention has been made to solve the above-described problem, and has as its object to reduce the inclination of the movable contact and the fixed contact at the time of contact with each other, thereby reducing the contact failure. To provide a switch.

[0009]

In order to achieve the above object, the present invention provides a housing constituting a main body, a fixed contact provided on the housing, and a housing provided so as to be separated from and connected to the fixed contact. A movable member provided movably, a movable contact provided at a position abutting on the fixed contact of the movable member, and a movable member provided on the housing so that the movable member moves to the fixed contact side. A contact button spring provided between the housing and the moving member, for urging the moving member toward the fixed contact, and bringing the movable contact into contact with the fixed contact; It is provided between the housing and the push button, and urges the push button toward the non-fixed contact side with a larger force than the contact connection spring, and counteracts the moving member against the force of the contact connection spring. Solid A contact separating spring for moving the movable contact from the fixed contact by moving the movable contact to a fixed contact, a cam having a concave locking portion provided on the push button, and a cam provided on the housing; When pushed in against the force of the separating spring, the cam is engaged with the engaging portion of the cam and the push button is held in a state of being pushed in by a predetermined amount, thereby enabling the moving member to move to the fixed contact side. hand,
The movable contact is brought into contact with the fixed contact by the force of the contact connection spring, and when the push button is further pressed from this state, the push button is disengaged from the locking portion of the cam and the force of the contact separation spring is applied. A pin for returning the movable member to the side opposite to the fixed contact, thereby separating the movable contact from the fixed contact.

[0010]

In the push button switch configured as described above, when the push button is pressed from the contact OFF state, the push button moves to the fixed contact side against the force of the contact separating spring. Then, the moving member can move to the fixed contact side by an amount that the push button has moved to the fixed contact side. Therefore, the moving member moves to the fixed contact side by the force of the contact connection spring, and the movable contact comes into contact with the fixed contact. At the same time, the pin is locked to the locking portion of the cam, and the push button is held in a state of being pushed by a predetermined amount, so that the state in which the movable contact contacts the fixed contact is continued. That is, the contact ON state continues.

Next, when the push button is pressed again, the push button moves to the fixed contact side against the force of the contact separating spring, and the pin comes off the locking portion of the cam. Therefore, the push button is in a free state and returns to the original position by the force of the contact separating spring. At this time, since the force of the contact separating spring is larger than the force of the contact connecting spring, the moving member moves to the side opposite to the fixed contact together with the push button. For this reason,
The movable contact is separated from the fixed contact and the contact is turned off.

In addition, since the fixed contact is provided on the housing and the movable member having the movable contact is movably provided on the housing, the movable member is inclined only by a fitting tolerance between the movable member and the housing. Therefore, since the moving member does not tilt significantly due to the accumulation of the plurality of fitting tolerances, the tilt at the time of contact between the movable contact and the fixed contact can be extremely small, and contact failure at the contact can be reduced. it can.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1 and FIG. 2, reference numeral 11 denotes a housing constituting a main body of the push button switch. Inside the housing 11, a wiring board 13 having a fixed contact 12 is provided. The housing 11 has a fixed contact 12
The lower guide tube 14 and the upper guide tube 15 are formed so as to extend upward (in the direction away from the fixed contact 12) in the figure.
A partition plate 16 is provided at the boundary between the lower guide tube 14 and the upper guide tube 15.
A through hole 16a is formed in the axis of the partition plate 16. Further, the housing 11 includes an outer guide tube 17 (see FIG. 4) so as to surround the lower guide tube 14 and the upper guide tube 15.
Reference).

The lower guide tube 14 is a sleeve (moving member).
The guide 18 is movably guided in the direction of coming and going to the fixed contact 12, and notches 14 a, 14 a extending downward from the lower surface of the partition plate 16 are formed on the opposing wall surface. The sleeve 18 has a quadrangular prism-shaped outer peripheral surface that fits precisely on the inner surface of the lower guide cylinder 14, and the fixed contact 12.
The low wall portion 1 is located at a position facing the
8a are formed. A columnar projection 18b is formed at the axial center of the lower wall 18a. Further, on the outer periphery of the upper end of the sleeve 18, locking projections 18 c, 18 c which are fitted to the respective notches 14 a and protrude further outward are provided at positions corresponding to the respective notches 14 a of the lower guide cylinder 14. .

The lower surface of the locking projection 18c on the distal end side is locked to a lower end portion 28a of a locking hole 28 of the push button 22, which will be described later. A coil spring 19 for contact connection (contact spring) is provided in the sleeve 18, and a movable contact 20 is provided on the lower surface of the low wall portion 18 a at a position corresponding to the fixed contact 12. . The coil spring 19 for contact connection includes a partition plate 16 and a low wall portion 18.
a is provided in a state compressed by a predetermined amount by
The movable contact 20 is brought into contact with the fixed contact 12 by urging the sleeve 18 downward.

Around the movable contact 20, there is provided a skirt-shaped rubber contact 21 whose lower edge is located below the movable contact 20. This rubber contact 2
1 is formed by a sufficiently soft elastic member so that the movable contact 20 comes into contact with the fixed contact 12 by the biasing force of the contact connection coil spring 19.

On the other hand, at the position of the upper guide tube 15, a push button 22 is provided together with a coil spring 23 for separating contacts. As shown in FIGS. 1 to 3, the push button 22 is a button unit 2 that is directly pressed from the outside.
4. It has a guide wall 25 and a guide column 26. The guide wall portion 25 is, as shown in FIG.
5 is formed in a U-shaped cross section so as to be inserted into a space surrounded by the lower guide tube 14 and the outer guide tube 17, and the guide column 26 is formed with a through hole of the partition plate 16. 16
a.

The opposite wall portions 27 of the guide wall portion 25,
In the position corresponding to each notch 14a of the lower guide cylinder 14, a guide hole 28 (see FIG. 2) is formed in an elongated rectangular shape in the axial direction.
Are formed. Then, the lower end portion 28 of each guide hole 28
The locking projection 18c of the sleeve 18 is locked to a. That is, the push button 22 allows the sleeve 18 to be fixed to the fixed contact 12 by the lower end 28 a of each guide hole 28.
To the side of the guide hole 2
The connection mechanism for connecting the push button 22 and the sleeve 18 is constituted by the lock projection 8 and the locking projection 18c.

The coil spring 23 for contact separation is provided so as to surround the outside of the guide column 26, one end of which contacts the upper end surface of the partition plate 16, and the other end of the button spring 24.
Is in a state of being compressed by a predetermined amount by being in contact with the inner surface of the. The contact separating coil spring 23 urges the push button 22 upward with a larger force than the contact connecting coil spring 19. That is,
Since the force of the contact separating coil spring 23 is greater than the force of the contact connecting coil spring 19, the sleeve 1
8 is pulled up by the push button 22 and is in contact with the partition plate 16.

Further, the guide wall 25 is provided with
As shown in FIG. 5, a cam groove (cam) 30 is formed on the outer peripheral surface of the wall portion 29 sandwiched between the wall portions 27, 27, and the housing 11 is provided with a pin 31 which is engaged with the cam groove 30. ing. The pin 31 is formed by bending the tip of the torsion coil spring vertically toward the bottom surface of the cam groove 30. This pin 31 has a front end surface urged toward the bottom surface of the cam groove 30 and the first end of the cam groove 30.
Are urged toward the reference side surface 32a. Hereinafter, the configuration of the cam groove 30 will be described while describing the operation of the pin 31.

As shown in FIG. 5, the cam groove 30 has a first bottom surface 33a with which the tip surface of the pin 31 contacts when the push button 22 is at the uppermost position. Thus, the state where the push button 22 is located at the uppermost position, that is, the contact O
When the push button 22 is pressed from the FF state, the pin 31 relatively moves upward along the first reference side surface 32a, and when the pin 31 moves by the stroke S1, the pin 31 hits the first upper limit regulating side surface 34a. First upper limit side surface 34a
Are formed continuously from the first reference side surface 32a, and have an upper concave side surface.

In this state, the tip surface of the pin 31 comes into contact with a second bottom surface 33b formed one step deeper than the first bottom surface 33a. Then push button 2
2 is released, the push button 22 is raised by the force of the coil spring 23 for contact connection, and the pin 31 is relatively moved to the first position.
Move downward along the reference side surface 32a of the cam groove 30 and further along the second reference side surface 32b formed as a step at the boundary between the first bottom surface 33a and the second bottom surface 33b. At the time when the stroke has descended by the stroke S2, it is stopped by the locking portion 35 that is concavely curved to the lowermost of the second reference side surface 32b. At this time, the tip end surface of the pin 31 comes into contact with a third bottom surface 33c formed one step deeper than the second bottom surface 33b.

The pin 31 is locked and stably held by the locking portion 35, whereby the push button 22 is stably maintained in a state where the push button 22 is pushed in a predetermined amount (that is, S1-S2). At this time, the sleeve 18 can be moved downward by an amount corresponding to the pushing of the push button 22 by a predetermined amount.
Move downward, the rubber contact 21 abuts on the wiring board 13 and deflects due to the urging force of the coil spring 19, and the movable contact 20 abuts on the fixed contact 12.
That is, the contact is turned on.

From this ON state, the push button 22 is again pressed.
When the button is pressed, the pin 31 moves relatively upward. At this time, the pin 31 moves upward along the third reference side surface 32c formed as a step at the boundary between the second bottom surface 33b and the third bottom surface 33c, and further tilts obliquely upward in the fourth direction. It moves diagonally upward along the reference side surface 32d, and the stroke S3
At this point, it stops by contacting the second upper limit regulating side surface 34b. In this state, the tip of the pin 31 comes into contact with the fourth bottom surface 33d formed one step deeper than the third bottom surface 33c.

When the pin 31 is released from the push button 22 at a position where the pin 31 contacts the second upper limit side surface 34b, the pin 31
Move downward along the fifth reference side surface 32e formed as a step at the boundary between the third bottom surface 33c and the fourth bottom surface 33d. Then, at the time when the stroke S4 has been moved,
The upper end surface of the sleeve 18 comes into contact with the lower end surface of the partition plate 16, and the relative movement of the pin 31 stops. At this time, pin 3
The first end surface moves from the fourth bottom surface 33d to the first bottom surface 33a. The fourth bottom surface 33 d is the second upper limit side surface 34.
The first bottom surface 3 is formed so as to gradually become shallower as it goes downward from the position b.
It is the same depth as 3a.

The portion having the locking portion 35 is the locking portion 3
It is a heart-shaped cam with 5 as a recess. The directions of the arrows of the strokes S1, S2, S3, and S4 indicate the directions in which the pins 31 move relative to the cam grooves 30. That is, the push button 22 faces in the direction opposite to the moving direction.

In the push button switch configured as described above, when the push button 22 is pushed from the contact OFF state, the push button 2
When the movement of the push button 22 is stopped and the hand is released from the push button 22 at this time, the stroke returns to the original position by the stroke S2, and the push button 22 stops at that position.

In this state, the sleeve 18 is movable to a position where the movable contact 20 can sufficiently contact the fixed contact 12, and moves toward the fixed contact 12 by the urging force of the contact connection coil spring 19. . Then, the movable contact 20 comes into contact with the fixed contact 12 by bending the rubber contact 21. That is, the contact is turned on.

When the push button 22 is pressed again from the contact ON state, the movement of the push button 22 stops at the point when the stroke has moved by the stroke S3. At this point, when the hand is released from the push button 22, the push button 22 moves only the stroke S4. It returns and returns to the original position in the OFF state. At this time, guide hole 2
Since the sleeve 18 is also pulled upward through the lock projection 8 and the locking projection 18c, the movable contact 20 is separated from the fixed contact 12, and the contact is turned off.

According to the pushbutton switch configured as described above, the fixed contact 12 is provided on the housing 11, and the sleeve 18 having the movable contact 20 is provided on the lower guide cylinder 14 of the housing 11 so as to be movable. From, sleeve 1
The sleeve 18 is inclined only by a fitting tolerance between the lower guide cylinder 8 and the lower guide cylinder 14. Therefore, since the sleeve 18 does not greatly tilt due to the accumulation of the plurality of fitting tolerances, the tilt at the time of contact between the movable contact 20 and the fixed contact 12 can be extremely small, and the contact failure at the contact is reduced. be able to.

Further, since the urging force of the contact separating coil spring 19 and the urging force of the contact connecting coil spring 23 act in a direction to cancel each other, there is an advantage that the push button 22 can be operated with a small force. is there. Further, since the push button 22 and the sleeve 18 are coaxially arranged, the force of the push button 22 does not act on the eccentric position of the sleeve 18, and the sleeve 18 can be smoothly moved in the axial direction. it can.

[0033]

According to the present invention, the fixed contact is provided on the housing, and the moving member having the movable contact is provided on the housing so as to be movable. Therefore, the moving member is provided only by the fitting tolerance between the moving member and the housing. Tilt occurs. Therefore, since the moving member does not tilt significantly due to the accumulation of the plurality of fitting tolerances, the tilt at the time of contact between the movable contact and the fixed contact can be extremely small, and contact failure at the contact can be reduced. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of a push button switch shown as one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same push-button switch, in a direction orthogonal to FIG.

FIG. 3 is a side view showing a push button of the push button switch.

FIG. 4 is a sectional view of the push button switch,
Sectional drawing along IV-IV.

FIG. 5 is a perspective view showing a cam groove formed in the push button of the push button switch.

FIG. 6 is a sectional view of a push button switch shown as a conventional example.

FIG. 7 is a sectional view showing an ON state of the push button switch.

[Explanation of symbols]

 Reference Signs List 11 housing 12 fixed contact 18 moving member (sleeve) 19 spring for contact connection (coil spring for contact connection) 20 movable contact 22 push button 23 spring for contact separation (coil spring for contact separation) 30 cam (cam groove) 31 pin 35 Locking part

Claims (1)

(57) [Scope of request for utility model registration] 1. A housing constituting a main body, a fixed contact provided on the housing, a moving member movably provided on the housing so as to be in contact with and separated from the fixed contact, and the fixing of the moving member. A movable contact provided at a position abutting on a contact; a push button movably provided on the housing, for regulating movement of the moving member to the fixed contact side; and between the housing and the moving member. A contact connecting spring for urging a moving member toward the fixed contact and bringing the movable contact into contact with the fixed contact; and a contact connecting spring provided between the housing and the push button. With a force greater than the spring, the push button is urged toward the non-fixed contact, and the moving member is moved toward the non-fixed contact against the force of the contact connection spring, thereby separating the movable contact from the fixed contact. A contact separating spring, a cam having a concave locking portion provided on the push button, and a cam provided on the housing, wherein the push button is pressed against the force of the contact separating spring. The push button is held in a state where the push button is pushed in by a predetermined amount by being locked to the locking portion of the cam, whereby the movable member can be moved to the fixed contact side, and the movable contact is fixed by the force of the contact connection spring. While making contact with the contacts, when the push button is further pressed from this state, the push button is released from the locking portion of the cam and returned to the original position by the force of the contact separating spring,
A pin for moving the movable member to the side opposite to the fixed contact, thereby separating the movable contact from the fixed contact.