JP3137906B2 - Microswitch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a microswitch,
In other words, a contact mechanism that has a minute contact interval and a snap action mechanism, and that opens and closes with a specified movement and a specified force is covered with a case, and an actuator is provided outside the case to make it compact. The present invention relates to a microswitch which can be used not only as a detection switch of an industrial processing machine but also as a switch for various consumer appliances.

[0002]

2. Description of the Related Art A conventional microswitch has a structure generally shown in FIG. 10, in which a switch has a small stroke and an operating force is regulated. To compensate for this drawback, the actuator (here, "part of the switch,
A mechanism that transmits an external force applied to this to an internal spring mechanism and operates a movable contact to open and close a switch ”. ), Various modifications are made, but in this case, there is a disadvantage that the height of the switch is increased.

[0003]

Since the conventional microswitch has the above-mentioned drawbacks, the present invention has no such drawbacks, that is, it has a simple structure and an increased height. Sufficient stroke is obtained as a switch, not only as a detection switch for industrial processing machines,
It is an object to provide a microswitch that can be used as a switch for various consumer appliances.

[0004]

According to the present invention, there is provided a plunger having a housing and a switch on / off drive button disposed on an upper surface thereof, the plunger being provided at the center of the back surface of the button.
The, above-HaiSo the housing central supporting cylinder erected on the said of the support cylinder plunger - due to the operation, a micro switch that enables driving a switching mechanism disposed around the support tube The switch
A reversing spring support is provided at the center of the housing.
Common terminal plate that opposes the wall and the switch handle support wall
-One end of the switch handle support wall
Switch on the other end of the switch handle
An arm support wall is provided, and the plunge is provided on both sides thereof.
A stopper wall which abuts on the lower surface of the lock pin is provided opposite to the other end.
A switch supported by the switch arm support wall.
A contact is placed at the other end of the switch arm and the counter
A reversing spring locking portion is provided, and the reversing spring is supported by the reversing spring support.
Between the holding wall and the reversing spring engaging portion,
The contact terminals for normally closed and normally open
The above problem has been solved by a micro switch characterized by being installed .

[0005]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a microswitch according to the present invention, in which 1 is a housing mounted on a base 2. An annular bezel 3 is fixed to the periphery of the upper surface of the housing 1. Reference numeral 4 denotes an annular cover having a bellows shape or the like, the lower edge of which is held down by a bezel 3, and the upper edge of which is an edge of a spherical button 5 disposed on the center of the housing 1. Fixed to The cover-4 moves following the movement of the button 5 to prevent dust from entering between the button 5 and the bezel 3.

A plunger 6 is fixed to the center of the back surface of the button 5, and the plunger 6 is a plunger tube 7.
It is slidably inserted into the inside from above. The plunger tube 7 is slidably fitted in a support cylinder 8 formed upward at the center of the housing 1. In the example shown,
A concave portion 1a is formed in the center of the housing 1, and the support cylinder 8 stands upright in the concave portion 1a. At the lower part of the plunger tube 7, a stopper for restricting the ascent operation of the plunger tube 7 by contacting the lower bottom surface of the support cylinder 8.
7a is installed.

A pair of pin grooves 9 are vertically provided on the support cylinder 8 from above (FIG. 2). A vertically elongated hole 10 penetrating in the horizontal direction is formed in the lower portion of the plunger 6, and a pin hole 11 communicating in the horizontal direction is formed in the upper half of the plunger tube 7 (FIG. 3). Then, the plunger pin 12 is inserted from the pin hole 11 into the vertically long hole 10. The length of the plunger pin 12 is set such that when the plunger pin 12 is inserted into the pin hole 11, both ends protrude from the pin hole 11 by a length slightly shorter than the thickness of the support cylinder 8. Plunger
In the tube 7, a plunger spring 13 which is in contact with the bottom surface of the plunger 6 and acts to constantly push up the plunger 6 is provided.

A switching mechanism, which will be described later, is provided in the central recess 1a of the housing 1, and a switching case 15 is provided in the switching mechanism.
And a strobe so as to surround the switch case 15.
The spring 16 is arranged. The upper surface of the stroke spring 16 is in contact with the rear surface of the button 5, and by changing its constant, the operating force for producing an operational feeling can be arbitrarily set.

The switching mechanism includes a common terminal plate 18 fixed to the recess 1a of the housing 1, a switch handle 19 having one end locked to the common terminal plate 18, and a switch handle 19 having one end locked to the switch handle 19. An annular switch arm 20, one end of which is supported by the common terminal plate 18,
The other end comprises an annular reversing spring 21 which is locked to the switch arm 20, an NC terminal (normally closed terminal) 22, and a NO terminal (normally open terminal) 23.

The shape of the common terminal plate 18 is as shown in FIG. 4 and has a substantially C-shape as a whole. A spring support wall 25 is provided upright at an intermediate portion, and a reversing spring 21 is provided at an upper portion thereof. A support groove 26 for fitting one end is formed. Further, a common terminal 27 protruding from the spring support wall 25 and protruding through the recessed portion 1a is provided. And the spring support wall 25
The two open ends opposite to each other are raised to form a switch handle support wall 28 in which the switch handle 19 described later is formed.
Locking groove 29a and locking hole 29 for locking both open ends of
Is formed. Further, on both sides of the spring support wall 25, rising walls 31 are provided opposite to each other.

The shape of the switch handle 19 is as shown in FIG. 5 and has a substantially C-shape as a whole, and a switch arm support which is located outside the spring support wall 25 during assembly at an intermediate portion thereof. A wall 32 is erected. A locking groove 33 for locking the switch arm 20 is formed on the outer surface of the switch arm support wall 32. Switch handle 19
At both open portions, a projection 34 to be inserted into the locking hole 29 of the common terminal plate 18 and an edge 34a supported by the locking groove 29a are formed. Switch arm support wall 32
The stopper wall 35 which contacts the lower surface of the plunger pin 12 is opposed to both sides of the plunger pin 12.

The shape of the switch arm 20 is as shown in FIG. 6, which is annular and has a contact mounting portion 36 projecting from a part thereof.
The contact 37 is attached there. Contact installation part 36
A concave portion 3 for locking the reversing spring 21 is
8 is formed, and a straight portion 39 is formed on the inner side surface opposite to the contact placement portion 36, and the straight portion 39 comes into contact with the locking groove 33 of the switch arm support wall 32.

The reversing spring 21 has an annular shape as shown in FIG. 7, and FIG. 7A shows an extended state when no load is applied.
(B) and (C) show the curved state at the time of assembly and operation. The reversing spring 21 has a switch arm 2 at one end.
The common terminal plate 18 has, on the outside of the other end, a linear portion 42 which is locked in the support groove 26 of the spring support wall 25 of the common terminal plate 18. . 43 indicates a bent portion.

FIG. 8 shows an example of the shapes of the NC terminal 22 and the NO terminal 23 and the positional relationship between the two at the time of assembly. Both the contact terminals 44 and 45 with which the contacts 37 of the switch arm 20 abut are shown. Have. NC terminal 22 and NO terminal 2
The lower end portions 3 protrude from the lower surface of the concave portion 1a, and are provided with wiring (not shown) together with the COM terminals 27 of the common terminal plate 18.

In the above structure, when no pressing force is applied to the button 5, the button 5 is pushed up by the stroke spring 16 so that the plunger 6 is pulled up. Is pulled up in contact with the lower bottom of the vertically long hole 10 (the state shown by the solid line in FIGS. 1 and 9). As a result, the plunger pin 1
2, the plunger tube 7 is moved to its stopper.
7a is pulled up until it hits the lower surface of the support cylinder 8 (see FIG. 1).

The reversing spring 21 is forcibly pressed into a curved state between the support groove 26 of the common terminal plate 18 and the recess 38 of the switch arm 20 and is loaded. Since the common terminal plate 18 to be supported is in a fixed state, the leading end of the common terminal plate 18 tends to jump up by the elastic force, and as a result, the switch arm 20 tends to jump up. Since the end of the switch arm 20 is locked in the locking groove 33 of the switch handle 19, the switch arm 20 is supported by the switch arm support wall 32 of the switch handle 19 in accordance with the flip-up operation.
The side acts to pull up until the stopper wall 35 of the switch handle 19 hits the plunger pin 12.

The switch handle 19 is supported by the common terminal plate 18 so as to be rotatable up and down about the projection 34 forming side, so that the movement of the switch arm 20 during the above operation is restricted. The contact 37 is always N
It is guided so as to contact the contact terminal 44 of the C terminal 22. This state is a switch-off state, and this state continues until the button 5 is pressed against the push-up force of the stroke spring 16.

When the button 5 is pressed against the above-mentioned spring pressure and the plunger 6 is lowered, the plunger tube 7 is pushed down via the plunger spring 13, and the plunger pin 12 is connected to the plunger pin 6. The switch handle 19 is pushed down through the stopper wall 35 which is in contact with the lower side of the vertically long hole 10 while being in contact with the lower surface. Accordingly, the switch handle 19 pivots downward about the edge portion 34a and pulls the switch arm 20 against the elastic force of the reversing spring 21. As a result, the contact 37 separates from the contact terminal 44 of the NC terminal 22 and comes into contact with the contact terminal 45 of the NO terminal 23 below, so that the switch is turned on.

After the switch is turned on, if the button 5 is further depressed, the plunger tube 7 is restrained from moving downward due to the flange 7b hitting the upper surface of the support cylinder 8 (FIG. 2). reference). At this point, the button 5 is lowered until the plunger pin 12 has left the lower surface of the elongated hole 10 of the plunger 6 and hits the upper surface. This is the overstroke stroke after the switch is turned on.

[0020]

As described above, the present invention has a structure in which the plunger fixed to the button is vertically movably disposed in the central cylindrical portion, so that a sufficient switch can be provided without increasing the height. A stroke can be obtained, and the overpressing stroke after the switch-on operation can be set sufficiently within the height range of the switch itself. The operating force for producing the operational feeling is the constant of the stroke spring. It can be set arbitrarily by changing. In addition, this micro switch can be finished with a sense of familiarity and good operation in terms of design, and is suitable not only as a detection switch for industrial processing machines but also for consumer equipment. It is.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view illustrating a configuration of a central portion of a housing according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a configuration of a plunger and a plunger tube in the embodiment of the present invention.

FIG. 4 is a plan view, a front view, and a side view showing a configuration of a common terminal plate according to the embodiment of the present invention.

FIG. 5 is a plan view, a front view, and a side view showing a configuration of a switch handle according to the embodiment of the present invention.

FIG. 6 is a plan view and a longitudinal sectional view showing a configuration of a switch arm according to the embodiment of the present invention.

FIG. 7 is a plan view and a side view when the reversing spring according to the embodiment of the present invention is extended and curved.

FIG. 8 shows an NC terminal and NO according to the embodiment of the present invention.
It is a figure which shows the example of a shape of a terminal, and the positional relationship at the time of an assembly.

FIG. 9 is a longitudinal sectional view showing the operation of the embodiment of the present invention.

FIG. 10 is a diagram illustrating a configuration example of a conventional microswitch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Depression 4 Cover 5 Button 6 Plunger 7 Plunger tube 7b Flange 8 Support cylinder 10 Vertical hole 12 Plunger pin 13 Plunger spring 18 Common terminal plate 19 Switch handle 20 Switch arm 21 Reversing spring 22 NC terminal 23 NO terminal 25 Spring support wall 28 Switch handle support wall 32 Switch arm support wall 35 Stopper wall 37 Contactor 44 Contact terminal 45 Contact terminal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 13/18 H01H 13/20 H01H 13/38

Claims (4)

(57) [Claims] 1. A housing having a housing and a switch on / off drive button disposed on an upper surface thereof, wherein a plunger installed at the center of the back surface of the button is arranged in a support cylinder provided upright at the center of the housing. A micro-switch for driving a switching mechanism disposed around the support cylinder in accordance with the operation of the plunger in the support cylinder.
Wherein the switching mechanism comprises the housing
In the center of the reversing spring support wall and switch handle support wall
A common terminal plate is installed opposite to
Switch housing supported on switch handle support wall
When a switch arm support wall is provided at the other end of the handle,
Contact the lower surface of the plunger pin on both sides thereof
A stopper wall is provided opposite to the end of the switch arm.
Connect the other end of the switch arm supported by the retaining wall
A stylus is arranged and a locking portion for the reversing spring is provided.
The reversing spring is connected to the reversing spring support wall and the reversing spring locking portion.
For a normally closed circuit where the contactor contacts
And a contact switch for a normally open circuit . 2. The plunger is slidably fitted into the support cylinder, and slidably fitted into a plunger tube having a plunger spring disposed on an inner bottom thereof.
2. The microswitch according to claim 1, wherein a plunger pin is inserted through the support cylinder, the plunger tube and the plunger, and the switching mechanism is driven via the plunger pin. 3. A plunger tube has a flange formed at an upper end thereof for abutting against an upper surface of the support cylinder to regulate a lowering operation end, and an insertion portion of the plunger for inserting the plunger pin is vertically elongated. 3. The microswitch according to claim 2, wherein the microswitch is formed as a hole so that an overpressing stroke corresponding to the length of the vertically long hole is enabled. 4. A periphery of the button and a periphery of the housing.
Install a flexible cover between the rim and the edge
The microswitch according to claim 1, 2, or 3.