JPH0330977Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Field of the Invention>> The present invention relates to a switch in which a reversing spring is reversely operated by a push operation of an operator to drive a movable contact, and in particular, the present invention relates to a switch in which a movable contact is driven by the operating force of an operator. This invention relates to a switch equipped with a rack-and-pinion mechanism that can be reliably opened and closed from a fixed contact.

<Summary of the invention> In this invention, a groove is formed on the surface on which the pinion slides up to the rack provided on the side of the operator, and the pinion slides on the tooth passing within the groove and the edge of the groove. Alternating moving teeth are formed.

<<Background of the Idea>> In a conventional switch of this type, a movable contact is driven from one fixed contact to the other fixed contact in the following manner.

In FIG. 8, the operator 1 is shaped like a prism.
Operation side racks 12A and 12B are on both sides of the lower side of 0.
are respectively provided, and their upper and lower side surfaces are used as pinion sliding parts 14A and 14B.

Then, along the push operation direction X of the operator 10,
On the left side in the figure is a pair of fixed contacts 16A, 16.
B is a pair of fixed contacts 16 on the right side in the figure.
C and 16D are respectively arranged.

Furthermore, the movable piece 18 is moved in the push operation direction X of the operator 10.
The movable piece 18 has a movable contact 20A in contact with either the fixed terminals 16A or 16B, and a fixed contact 1 on both sides of the movable piece 18.
Movable contact 20B in contact with either 6C or 16D
are provided for each.

Further, when the operating element 10 is pushed in the X direction, the pinions 22A and 22B are slid on the pinion sliding portions 14A and 14B, respectively, and are engaged with the operating side racks 12A and 12B.

These pinions 22A, 22B are connected to drive-side racks 26 formed on the movable contact drivers 24A, 24B.
A and 26B, respectively, and when the operator 10 is operated in the X direction, the tip side pinion sliding parts 14A and 14B slide respectively, and then the pinions 22A and 22B are engaged with the racks 12A and 12B.
B rotates. As a result, the movable contact driver 24
A and 24B are driven upward in the figure by the operating force of the operator 10 applied via pinions 22A and 22B.

The movable piece 18 is driven upward in the figure by these movable contact drivers 24A and 24B.

As a result, as shown in FIG.
A and 20B are separated from fixed contacts 26A and 26C, respectively.

Therefore, when the operator 10 is pressed, the fixed contacts 16A, 16C are reversed to move from the movable contacts 20A, 20A, 20C.
If the reversing spring (not shown) that drives 0B to the fixed contacts 26B and 26D is damaged, or if the fixed contact 16
Even if the movable contacts 20A, 20B are welded to the movable contacts 20A, 20B, the movable contacts 20A, 20A, 20B can be moved from the fixed contacts 16A, 16C by pressing the operator 10.
20B can be forcibly separated.

However, in this type of conventional switch, the pinions 22A and 22B slide on flat pinion sliding parts 14A and 14B as shown in FIG. from the center O of the pinion sliding part 14
Since the difference between the distance A to A and 14B and the distance B to the tooth surface in contact with this is small, the pinion sliding part 1
There are burrs on 4A and 14B or the operator 10
When the pinions 22A, 2 are operated rapidly, the pinions 22A, 2
2B rotates, resulting in a problem that it becomes impossible to separate the movable contact A from the fixed contact 16A, as shown in FIG. 11, for example.

<<Purpose of the invention>> The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a switch of this type that can effectively prevent rotation of the pinion during sliding.

<Structure and Effects of the Invention> In order to achieve the above object, the present invention includes: a columnar operator which is provided with a pinion sliding part and an operating side rack on the side surface and which is operated by pressing; a pair of fixed contacts that are pressed, a reversing spring that presses a movable contact toward one fixed contact and presses the movable contact toward the other fixed contact by a reversal action caused by a push operation of an operator; A pinion that slides on the pinion sliding part and meshes with the sliding rack, and a drive rack that meshes with the pinion are provided, and the pinion is movable by the operating force of the operator obtained through the drive rack. a movable contact driver that drives the contact from one fixed contact to the other fixed contact; a tooth passage groove is formed in the pinion sliding part in the pushing operation direction of the operator, and the pinion has a tooth width. It is characterized in that teeth set at widths below and above the width of the tooth passage groove are alternately formed, and narrow teeth are passed through the tooth passage groove.

According to the present invention, as can be understood from FIG. 1, the narrow tooth whose width is less than the width of the tooth passage groove 28 passes through the tooth passage groove 28, and the tooth width is made larger than the width of the tooth passage groove 28. Since the teeth on both sides slide on the edges of the groove, the difference between the distance A from the center of the pinion to the surface of the sliding part of the pinions 22A and 22B and the distance B to the tooth surface in contact with this is expanded. Even if a burr exists or the operator is operated at high speed, it is possible to reliably prevent the pinion from rotating.

As a result, it becomes possible to reliably separate the movable contact from the fixed contact, which had been pressed by the reversing spring, by pushing the operator.

<<Description of Embodiments>> Hereinafter, preferred embodiments of the switch according to the present invention will be described based on the drawings.

FIG. 2 shows a front view of this embodiment, and FIG. 3 shows a side cross-section thereof, in which an operator (plunger) 10 is inserted into a case 30 from the top.

The operator 10 is formed into a prismatic shape, and the portion inserted into the case 30 is hollow with both sides open.

A receiving plate 32 fixed to the case 30 side is inserted into this hollow portion as shown in FIG. 3, and a return spring 34 is inserted between this receiving plate 32 and the upper surface of the hollow portion. ing.

Therefore, the spring 34 urges the operator 10 upward, thereby positioning the upper surface of the operator 10.

The head of the operator 10 is formed into a hemispherical shape, and a sealing cap 36 is fitted between the hemispherical head and the case 30.

As shown in FIG. 3, a cover 38 is fitted to the front opening of the case 30 via a sealing material (not shown), and the cover 38 is fixed to the case 30 with screws 40. .

Further, as shown in FIG. 2, projections 42 are formed on both sides of the intermediate portion of the operator 10, and one end of a snap piece 44 is respectively locked by these projections.

Furthermore, an insertion hole through which the operator 10 is inserted is formed in the center of the movable piece 18, and frame holes are formed on both sides of the insertion hole, and the other ends of the snap pieces 44 are engaged with both ends of these frame holes. has been done.

Each of the snap pieces 44 has a pair of sliders 45, and the shaft teeth of the sliders 45 are overlapped with each other.

A protrusion 42 and a jaw 46 which are respectively engaged with the ends of the frame holes are formed at the tips of these shaft parts, and a reversing spring 48 is mounted on the overlapping shaft parts.

Further, movable contacts 20 are provided at both ends of the movable piece 18.
A and 20B are provided, respectively, and fixed contacts (normally closed contacts) 16A and 16C are arranged below them.

Furthermore, fixed contacts 16B and 16D are arranged above the movable contacts 20A and 20B, respectively, and are opposed to the fixed contacts 16A and 16C, respectively.

Note that the fixed contacts 16A and 16C are each provided on a fixed terminal 50 fixed in the case 30, and a screw 52 for fixing a connecting wire is screwed into each of these fixed terminals 50.

The fixed contacts 16B and 16D are each provided at the lower part of a fixed terminal 54 fixed to the case 30, and a screw 56 for fixing a connecting wire is screwed into each of these fixed terminals 54.

Further, at the bottom of the case 30, these terminals 50,
An insertion hole 58 for a connecting wire connected to the contact point 54 is formed as shown in FIG.
The inner covers 60 of 6B, 16C, 16D, 20A, and 20B are screwed inside the case 30.

As understood from the above explanation, the operator 10
When the head of is operated toward the bottom of Figure 2,
The movable contacts 20A, 20 are moved by the reversing action of the reversing spring 48.
B is pulled upward, and the movable contacts 16A, 16
B is 1 from the pressed state to the fixed contacts 16A and 16C.
The state is switched to the pressed state of 6B and 16D.

In this way, the child switch is opened and closed by the snap action, but the movable contact 20A,
In order to ensure that the fixed contacts 20B and the fixed contacts 16A and 16C are separated even when they are welded together, this embodiment has the following rack and pinion mechanism.

The movable piece 1 drives the movable contacts 20A and 20B to open.
8 is pulled upward using the operating force of the operation 10, and the lifting drive is performed by movable contact drivers 24A and 24B.

The upper parts of the movable contact drivers 24A and 24B are connected by a connecting part 62, forming a U-shape as a whole as shown in FIG. 2, and are movable by the connecting part 62 through which the operator 10 is inserted. Piece 1
8 is being driven.

Further, drive-side racks 26A, 26B are formed on the inner facing surfaces of the movable contact drivers 24A, 24B, and pinions 22A, 22B are mounted on them.
are interlocked with each other.

Further, the left and right sides of the slider 10 facing the drive-side racks 26A and 26B are provided with pinion sliding portions 14, respectively.
A and 14B, and operating side racks 12A and 12B are formed above them, respectively.

Therefore, when the operator 10 is pushed downward in FIG. 2, the pinions 22A and 24B slide on the pinion sliding parts 14A and 14B, respectively, and then engage with the operating side racks 12A and 12B, respectively. Rotate.

Due to the rotation, the pushing force of the operator 10 is applied to the connecting portion 6 via the drive-side racks 26A and 26B.
As a result, the movable piece 18 is driven upward, and the movable contacts 20A and 20B are driven to open and separate from the fixed contacts 16A and 16C, respectively.

Here, as shown in FIG. 4, passage grooves 64A and 64B are formed in the pinion sliding parts 14A and 14B of the operator 10, respectively, in the push operation direction X of the operator 10, and as shown in FIG. As can be understood, the operating racks 12A and 12B are formed across the width of the operating element 10.

FIG. 6 is a perspective view of the operator 10, in which the pinion 22B slides on the pinion sliding portion 14B as shown in FIG. 7, and the pinion 22A slides on the pinion sliding portion 14A. Passing groove 64A, 6
The depth of 4B is set deeper than the total tooth depth of pinions 22A, 22B, and
Teeth 22B are alternately formed with tooth widths set to be less than and greater than the widths of the tooth passage grooves 64A and 64B.

As can be understood from FIGS. 7 and 2, teeth with narrow tooth widths pass through the tooth passage grooves 64A, 64B, and teeth with wide tooth widths slide on both edges of the tooth passage grooves 64A, 64B. do.

As can be understood from FIG. 1, in this case, the distance A from the center of the pinions 22A, 22B to the pinion sliding parts 14A, 14B, and the wide teeth from the center O to the pinion sliding parts 14A, 14B. 1
The difference between the distance B and the position where the pinions 22A,
The rotation during sliding of 2B is the pinion sliding part 14.
This is effectively prevented despite burrs A and 14B and high speed operation of the slider 10.

As explained above, according to this embodiment, when the pinions 22A, 22B slide on the pinion sliding parts 14A, 14B by the push operation of the operator 10, rotation of the pinions 22A, 22B is effectively prevented. 2
It becomes possible to reliably drive opening and closing of 0A and 20B from fixed contacts 16A and 16C, and opening and closing operations are ensured.

Further, since both pinions 22A and 22B are prevented from rotating during sliding, there is no possibility of tooth misalignment between them, and therefore the movable piece 18
is driven in a horizontal position in FIG. 2, and as a result, the movable contacts 20A, 20B are reliably prevented from opening incorrectly and from stopping at the neutral position.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the sliding posture of the pinion in the embodiment, Fig. 2 is a front view of a preferred embodiment of the device according to the present invention, Fig. 3 is a side sectional view of the embodiment of Fig. 2, and Fig. 4 2 is a sectional view of the operator in the embodiment shown in FIG. 2, FIG. 5 is a side view of the operator in the embodiment shown in FIG. 2, FIG. 6 is a perspective view of the operator 10 in the embodiment shown in FIG. Fig. 2 is an explanatory diagram of the main parts of the embodiment, Fig. 8 is an explanatory diagram of the configuration of the conventional device, Fig. 9 is a perspective view of the operator in the conventional example in Fig. 8, and Fig. 10 is a pinion in the conventional example in Fig. 2. FIG. 11 is an explanatory diagram of the sliding posture of FIG. 8, and FIG. 8 is an explanatory diagram of malfunctioning operation of the conventional example. 10...Operator, 12A, 12B...Operation side rack, 14A, 14B...Pinion sliding part, 16
A, 16B, 16C, 16D... Fixed contact, 20
A, 20B...Movable contact, 22A, 22B...Pinion, 24A, 24B...Movable contact driver, 2
6A, 26B... Drive side rack, 45... Reversing spring, 64A, 64B... Tooth passage groove.

Claims (1)

[Scope of Claim for Utility Model Registration] A column-shaped operator that is provided with a pinion sliding part and an operating side rack on the side surface and that is operated by pressing, a pair of fixed contacts that are arranged along the pushing direction of the operator, and one of the following: a reversing spring that presses the movable contact against the fixed contact of the other fixed contact and also presses the movable contact against the other fixed contact by a reversal action caused by the push operation of the operator; A pinion that moves and meshes with the sliding rack, and a drive rack that meshes with the pinion are provided, and the operating force of the operator obtained through the drive rack moves the movable contact from one fixed contact to the other. a movable contact driver that drives toward the fixed contact; a tooth passage groove is formed in the pinion sliding portion in the direction of the pushing operation of the operator; and the pinion has a tooth width that is less than or equal to the width of the tooth passage groove. 1. A switch characterized in that the teeth each set in the width direction are alternately formed, and the narrow teeth are passed through a tooth passage groove.