JPH0517764Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a switch that opens and closes an electric circuit.

(b) Prior Art In the above-mentioned switch, the movable contact melts due to the spark generated by switching the movable contact constituting the electric circuit, and the normally closed contact, which is in constant contact, welds to the movable contact due to this melting. As a result, switching of the movable contact may become impossible, and the incidence of such welding increases over time.

Conventionally, there have been switches having means for separating the above-mentioned welds.

That is, as shown in FIG. 1, recesses 2, 2 are formed on each side of the opposite position of the plunger 1, which is biased upward by a suitable spring and can move up and down within a predetermined range, and a movable piece made of a plate spring material. The inner ends of the respective snap pieces 4, 4, which are formed by notching and pulling the center part of 3 left and right, are locked in the aforementioned recesses 2, 2, and by vertically moving the plunger 1, both snap pieces 4, 4 are pulled out. 4, the biasing direction acting in the two vertical directions is switched from one to the other (snap action action), and the position of the movable piece 3 is switched from one to the other (reversal of the movable piece 3). Also, the movable contacts 5, 5 of the electric circuit are fixed to both ends of the movable piece 3, and below the movable contacts 5, 5, the electric circuit is connected to and disconnected from each of the above-mentioned movable contacts 5, 5 at the fixed position. Normally closed contacts 6, 6 are arranged opposite to each other, and normally open contacts 7, 7 of the electric circuit that connects and disconnects are arranged above each of the above-mentioned movable contacts 5, 5 at a fixed position, and the plunger 1 is pushed down. As a result, the above-mentioned movable piece 3 is reversed by the snap action operation, and each movable contact 5,5 is configured to have a switch structure in which each movable contact 5,5 is switched from each normally closed contact 6,6 to each normally open contact 7,7. Furthermore, L-shaped release levers 9, 9 are provided at symmetrical positions across the plunger 1 on the lower surface side of the movable piece 3, and are pivoted in fixed positions by shaft portions 8, 8, respectively. On the lower end sides of the levers 9, 9, there are protrusions 11, 1 which are rotatably operated by cam surfaces 10, 10 formed at positions corresponding to the release levers 9, 9 at the lower part of the plunger 1.
1, and the upper free ends 12, 12 of the release levers 9, 9 are located close to the movable contacts 5, 5.

In the switch configured in this way, when the plunger 1 is pressed down, the movable piece 3 is reversed by the snap action action of both the snap pieces 4, 4, and the movable contacts 5, 5 of the movable piece 3 are rotated. is switched from each normally closed contact 6, 6 to each normally open contact 7, 7, and at the same time each cam surface 10, 10 of plunger 1 abuts each protrusion 11, 11 of each release lever 9, 9, Since this is rotated, if one or both of the movable contacts 5, 5 are welded to one or both of the normally closed contacts 6, 6, the free end side of each release lever 9, 9 will rotate, and each The free ends 12, 12 push up each movable contact 5, 5 side of the movable piece 3 from the lower surface side, and separate the welding of one or both of the above-mentioned movable contacts 5, 5.

(c) Problems to be solved by the invention However, in the case of the switch described above, each time the plunger 1 is pressed down, the protrusions 11, 11 of the release levers 9, 9 move against each cam surface of the plunger 1. 10,10
This contact is due to friction, so when the cam surface 10 and the protrusion 11 wear out and separate the welds that have occurred over time, the degree of mutual wear is already large and the friction occurs. It has the problem that it cannot be strongly separated.

Further, since each of the above-mentioned separation levers 9, 9 obtains the separation action by rotating around each shaft portion 8, 8, the rotation locus of each free end portion 12, 12 becomes an arc. , a slight vertical component of force acts on each of the movable contacts 5, 5 of the movable piece 3, and most of the force is released to the inside of the arc, and in addition, the movable piece 3 is formed of a plate spring material In this case, when the release levers 9, 9 are pushed up for release, the movable piece 3 is warped, and as a result, a sufficient acting force cannot be obtained on each of the movable contacts 5, 5. Has a point.

Furthermore, since the load of the plunger 1 on each release lever 9 is applied to the respective thin shaft portions 8, 8, there is a problem in that these shaft portions 8, 8 are easily damaged.

The object of this invention is to provide a switch whose welding/separating structure is not damaged over time and which can provide reliable welding/separating action.

(d) Means for solving the problem This invention is based on a plunger that is supported to be movable in the vertical direction within a set range when the plunger is pressed down, and a movable piece formed in a plate shape that moves in the vertical direction of the plunger. One end of a snap piece is arranged with the plate surface horizontally and movable in the vertical direction, and the plunger is provided with an elastic biasing direction that can be switched between two directions, up and down. the other end of the snap piece is connected to an operating point of the movable piece that moves the movable piece up and down, and a movable contact of an electric circuit is formed on the lower surface of the side of the movable piece that moves up and down. , a switch in which a normally closed contact of an electric circuit that connects and separates from the movable contact of the movable piece at a fixed position is provided opposite to the movable contact of the movable piece, the side surface of the plunger on the side corresponding to the normally closed contact; A separation rod parallel to the plunger and slidably supported in the vertical direction is provided, and the head of the separation rod is positioned opposite to the movable contact near the lower surface of the movable piece, so that the plunger and the above-mentioned A rack is engraved on each of the surfaces facing the opening rod, and a pinion that meshes with the rack is interposed between these racks, and the opening section is provided on the plate surface portion of the movable piece excluding the movable contact. The switch is characterized in that a replenishing member is fixed to the movable piece for reinforcing the movable piece so that the movable piece does not warp when the rod applies a separating force to the movable piece.

(E) Function In the switch of this invention, when the plunger is pressed down, the snap piece switches the biasing direction upward (snap action action) and moves the movable piece upward (reversing), thereby causing the movable piece to Opens and separates the movable contact from the normally closed contact.

At the same time, the pinion is rotated by the rack of the plunger, which moves the separation rod upward, and the head of the separation rod pushes up the vicinity of the movable contact of the movable piece from the normally closed contact side in the opening direction. The movable contact of the movable piece is separated from the normally closed contact.

The reinforcing member reinforces the load on the movable piece when the movable piece is pushed up as described above, so that the force of the separation lever that acts on the movable piece acts in a direction perpendicular to the movable contact. The movable contacts are opened and opened in parallel.

(f) Effects of the invention As a result of the above, according to this invention, since the opening rod is moved by the gears of the rack and pinion,
Since these movements are by rolling contact, there is no wear due to aging, and therefore a reliable separating action can be obtained even after aging.

Furthermore, since the opening lever moves in the same direction as the opening direction of the movable contact, that is, in the vertical direction, there is no loss of acting force.Moreover, since the plate surface of the movable piece is reinforced with a reinforcing member, When the separating rod presses, there is no warpage in the movable piece, that is, there is no loss of acting force, the movable contact opens parallel to the normally closed contact, and a reliable welding and opening action is obtained. Also,
The structure is strong and can withstand years of use.

(g) Example of the invention An example of the invention will be described below in detail based on the drawings.

The drawings show a switch, and in FIGS. 2 and 3, this switch 21 includes a case 22 and an outer cover 2.
3, inner cover 24, plunger 25, snap pieces 26, 26, movable piece 27, movable contacts 28, 28,
It is composed of normally closed contacts 29, 29 and normally open contacts 30, 30.

The above-mentioned plunger 25 has a hemispherical upper end, a prismatic shaft, and the case 2.
2, and this insertion part is formed in a hollow shape with both sides open, and a receiving plate 31 fixed to the case 22 side is inserted into this hollow part, and this receiving plate 31 and A return spring 32 is interposed between the upper surface of the hollow part and urges the plunger 25 upward, and also positions the plunger 25 at its upper limit, allowing vertical movement within a set range. I support it.

and the upper spherical part of the plunger 25 and the case 2.
2, there is a cap 33 formed of a rubber material.
is fitted and sealed.

The lower portion of the case 22 through which the plunger 25 is inserted is formed into a concave shape, and the outer cover 23 is fitted into the opening of this concave portion through an appropriate sealing material at its joint, and is removably fixed thereto by a plurality of screws 34....

Projections 35, 35 for locking one end of each of the two snap pieces 26, 26 are formed on both positionally opposing sides of the middle part of the plunger 25, and the middle part of the movable piece 27 is , plunger 2
5 can be inserted through it, and two snap pieces 2 can be inserted.
6 and 26 are cut out in the shape of a frame so that they can perform a snap action action (switching action of the biasing direction), and the snap pieces 26 and 26 are provided at both ends of the cutout portion 36.
The other end is locked.

Each of the above-mentioned two snap pieces 26, 26 has a pair of sliders 38, 38 having flanges 37, 37 on one end side, and one spring 39.
The pair of sliders 38, 38 are formed by positioning their flanges 37, 37 on the outside, and inserting their shafts from both ends of the spring 39, so that the shafts overlap. The spring 39 is assembled around the outer periphery, and when the snap piece 26 performs a snap action, the flange 39
The space between 7 and 37 is provided so that it can be expanded and contracted.

Movable contacts 28, 28 constituting an electric circuit are fixed to both ends of the above-mentioned movable piece 27, and below these movable contacts 28, 28, a normally closed contact 29,
29 are provided oppositely, and these normally closed contacts 29,
Reference numeral 29 is fixed to each fixed terminal 40, 40 fixed to the case 22, for example, by insert molding, and to these fixed terminals 40, 40 are mounting screws 41, which fix connecting wires (not shown) constituting an electric circuit.
41 are screwed together.

Further, above each of the movable contacts 28, 28, normally open contacts 30, 30 forming an electric circuit face each other, and these normally open contacts 30, 30 are fixed to each case 22 by insert molding, for example. It is fixed to fixed terminals 42, 42, and mounting screws 43, 43 are screwed into these fixed terminals 42, 42, respectively, for fixing connection wires (not shown) constituting an electric circuit.

In addition, each terminal 40, 42 is provided at the bottom of the case 22.
An insertion hole 44 for a connection wire to be connected to is formed. In addition, the inner cover 24 has the above-mentioned contacts 28 to 30.
It is attached to the inside of the case 22 with screws or the like to cover the parts.

The above-mentioned movable piece 27 is formed of a thin plate-like body, and has an opposing surface facing each normally closed contact 29, 29, that is,
On the lower surface of the plate surface of the movable piece 27, reinforcing members 45, 4
5 is fixed, and this fixation is achieved by inserting a plurality of pins 46 connected to the reinforcing member 45 into pin holes 47 formed in the movable piece 27 in correspondence with the above-mentioned pins 46. ...'s head is caulked.

The above-mentioned reinforcing member 45 is for reinforcing the movable piece 27 so that the operating piece 27 does not warp when a separating force acts on the lower surface side of the movable piece 27.

Further, buffer grooves 48, 48 are cut into the side surfaces of both ends of the above-mentioned reinforcing member 45.

At the bottom of each buffer groove 48, 48 of the above-mentioned reinforcing member 45, each movable contact 28, 2 is located close to the buffer groove 48, 48.
Two separation rods 49, 49 that move up and down in the same direction as the separation direction (contact/separation direction) of 8 are provided facing each other with the plunger 25 in between.
The outer surface of the case 22 slides up and down in contact with sliding surfaces 50, 50 formed on the inner wall of the case 22, and racks 51, 51 are carved on the inner surface, respectively.

Further, the aforementioned plunger 25 is inserted into the intermediate position between the above-mentioned opening levers 49, 49, and racks 52, 52 are provided on both sides of the lower part of the plunger 25 facing each opening lever 49, 49. Between these racks 52, 52 and each of the racks 51, 51 of each of the above-mentioned opening rods 49, 49,
Pinions 53, 53 are interposed and mesh with each other, and both ends of these pinions 53, 53 are pivotally connected to the inner cover 24 of the case 22.

The switch 21 configured in this way has a plunger 2
When the upper spherical part of 5 is pressed down, in Fig. 2,
The outer end side of each snap piece 26, 26 is urged downward and is prevented from moving downward via the movable piece 27 and each movable contact 28, 28, so that each snap piece 26,
Each of the sliders 38, 38 of 26 slides in the contraction direction against the spring 39, and the space between the flanges 37, 37 is contracted, allowing the plunger 25 to move downward.

When the position of each projection 35, 35 of plunger 25 exceeds the horizontal posture position of each snap piece 26, 26, the outer end of each snap piece 26, 26 becomes upward, that is, the biasing direction becomes upward. ,
The upper surface side of the movable piece 37, that is, each movable contact 2
Since the upper surfaces of the snap pieces 8 and 28 are open, the acting force of the spring 39 pushes up the movable piece 27 and switches the urging direction upward, causing the snap pieces 26 and 26 to move upward.
A snap action action occurs.

Therefore, even if the movable piece 27 becomes a rigid body due to the fixation of the reinforcing members 45, 45, a snap action action can be produced.

Therefore, by the snap action action of each of the snap pieces 26, 26, the movable piece 27 moves upward, and each movable contact 28, 28 closes to each normally closed contact 2.
9, 29 to respective normally open contacts 30, 30.

Further, when the plunger 25 is released from being pressed down, the plunger 25 moves upward, and this upward movement causes each snap piece 2 to
6 and 26 perform a reverse snap action movement, the movable piece 27 moves downward, and each movable contact 28, 28 is switched from each normally open contact 30, 30 to each normally closed contact 29, 29.

Next, the operation of each separation rod 49, 49 will be explained based on FIGS. , 53 are rotated, and the respective racks 51, 51 of both opening rods 49, 49 are sent upward, and both opening rods 49, 49 move upward, and their upper ends vertically touch both ends of reinforcing member 45. Push up from a certain direction.

As a result, each movable contact 28, 28 of the movable piece 27
is welded to each normally closed contact 29, 29,
By preventing the movable piece 27 from warping, each normally closed contact 29,
29, push up each movable contact 28, 28 of the movable piece 27 in the perpendicular opening direction,
This can be released.

Incidentally, the shock generated when the separation rods 49, 49 move upward and come into contact with both ends of the reinforcing member 45 is absorbed by the buffer grooves 48, 48 formed at both ends.

As described above, according to the switch of this embodiment, the opening rod 49 is connected to the racks 51, 52 and the pinion 5.
Since these movements are by rolling contact, there is no wear due to aging, and therefore, a reliable opening action can be obtained even after aging.

Furthermore, since the opening rod 49 moves in the same direction as the opening direction of the movable contact 28, that is, in the vertical direction, there is no loss of acting force.Moreover, the plate surface of the movable piece 27 is reinforced with the reinforcing member 45. Therefore, when the separation rod 49 presses, the movable piece 27 does not warp, that is, there is no loss of acting force, and the movable contact 28 is opened and opened parallel to the normally closed contact 29, ensuring reliable welding. It provides a releasable effect, and has a strong structure that can withstand use over time.

The snap piece 26 in the above-mentioned embodiment may be formed by, for example, forming the movable piece 27 from a leaf spring material and pulling up the snap piece from this, or may have another structure.

Furthermore, the reinforcing member 45 can be fixed using an insert,
Alternatively, other fixing means may be used.

[Brief explanation of drawings]

FIG. 1 is a partial front view of a switch equipped with a conventional welding and separating means, and the following shows an embodiment of this invention.
FIG. 2 is a sectional front view of the switch, FIG. 3 is a sectional side view thereof, and FIGS. 4 and 5 are explanatory diagrams showing the operating state. 21... Switch, 25... Plunger, 26...
...Snap piece, 27...Movable piece, 28...Movable contact, 29...Normally closed contact, 30...Normally open contact, 45
... Reinforcement member, 49 ... Separation rod, 51, 52 ...
Lack, 53...Pinion.

Claims (1)

[Scope of Claim for Utility Model Registration] A movable piece formed in a plate shape is arranged on a plunger that is supported so as to be movable in the vertical direction within a set range, and the plate surface is horizontal with respect to the vertical direction of the plunger. , arranged so as to be movable in the vertical direction, one end of a snap piece capable of switching the urging direction of its own elastic force in two directions, up and down, is locked to the plunger, and the other end of the snap piece is connected to an actuation point of the movable piece that moves the movable piece up and down, a movable contact of an electric circuit is formed on the lower surface of the side of the movable piece that moves up and down, and a movable contact of the movable piece is connected to the movable contact of the movable piece at a fixed position. A switch having a normally closed contact of an electric circuit that connects and disconnects with the movable contact of the movable piece, the switch having a side surface of the plunger on the side corresponding to the normally closed contact that slides vertically parallel to the plunger. The opening rods are arranged opposite to each other and the heads of the opening rods are positioned opposite to each other in the vicinity of the movable contact on the lower surface of the movable piece, and a rack is provided on each of the facing surfaces of the plunger and the opening rod. At the same time, a pinion that meshes with the rack is interposed between these racks, and the separation rod applies a separation force to the movable piece on the plate surface portion excluding the movable contact of the movable piece. A switch having a reinforcing member fixed to the movable piece to prevent the movable piece from warping when the movable piece is bent.