JP2011238554A - Switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lever-type switching device having excellent mechanical durability, involving a small number of parts and being easy to assemble due to a simple structure.SOLUTION: A switching device includes: a shaft with a permanent magnet fixed on a tip fitted on an elastically deformable plate material; and a magnetism detection element for detecting magnetism. The switching device performs a switching operation by converting a displacement of the permanent magnet resulting from a rotation of the shaft into a change in the output voltage of the magnetism detection element. Thus, a switching device including no sliding mechanism other than elastic deformation between the shaft and the plate material can be configured, whereby providing excellent mechanical durability, a simple structure, and a good assemblability.

Description

  The present invention relates to a switch device that outputs an on / off signal by moving a lever.

There are many types of switches for manual operation, such as push button type, rotary type, lever type, etc., depending on the purpose of use and installation conditions, etc., but assortment of goods in warehouses and parts assembly work at production sites Since a so-called picking operation such as that requires simple operability and reliable operation, a lever-type switch is generally used.
Since the lever type switch can have a large operating stroke depending on the size of the lever, if the mechanism is designed so that the switch operates with a small stroke, the switch can be operated stably regardless of the strength of the operating force. Since things can be realized, there is an advantage that it is possible to concentrate on other work without using extra nerves such as force adjustment like a push button type switch.
For these reasons, lever-type switches have been often used for picking operations.

JP 2009-26509 A

However, the lever type switch generally has a structure that combines a contact type switch (micro switch, tact switch, etc.) and a lever mechanism, and the life of the switch contact and the mechanical life due to wear of the rotating mechanism and the peristaltic mechanism are often problematic. It has been.
As for the durability of the switch, for example, a non-contact type switch such as an optical sensor or magnetic detection disclosed in Japanese Patent Application Laid-Open No. 2009-26509 has been proposed, and the life of the switch contact is intended to be extended. Has been.

On the other hand, in this example as well, several types of embodiments have been proposed for the lever mechanism in order to achieve smooth operability and reliable switch operation. The problem of life cannot be avoided, and there is still room for reduction in the number of parts and the number of assembling steps.
The present invention is intended to solve the problems of such a conventional switch device, and ensures a sufficient mechanical life in combination with smooth operability and reliable switch operation, and has a simple structure. Accordingly, it is an object of the present invention to realize a switch device that can reduce the number of parts and the number of assembly steps as compared with the prior art.

  In order to achieve the above object, the present invention fixes a plate material that can be elastically deformed to the switch casing, and attaches a rod-shaped shaft body with a permanent magnet fixed to the end portion to the plate material, The casing is provided with a magnetic sensing element for detecting a change in the magnetic field.

  The effect | action by the said problem-solving means is as follows. That is, the invention according to claim 1 of the present invention is a plate material that can be elastically deformed and has a through hole, a box-like case in which the plate material is fixed by a fixing member, and an outer diameter larger than that of the through hole. A rod-shaped shaft body, a permanent magnet provided at an end portion of the shaft body, and a magnetic sensing element disposed in the box-shaped case, the shaft body is provided with a groove portion, and the width of the groove portion Is approximately equal to the plate thickness of the plate material, and the outer diameter of the bottom surface portion of the groove portion is substantially equal to the diameter of the through hole, and the plate member is fitted and mounted in the through hole portion of the plate material. The switch device is configured to detect a switch state change by converting the rotational displacement of the shaft body into a change in output voltage by the magnetic sensing element. If the shaft is rotated, the shaft The relative position of the permanent magnet of the part and the magnetic detection element in the box-shaped case changes, and the change in the output voltage is caused by the change in the magnetic field intensity detected by the magnetic detection element, and this is regarded as a change in the switch state. .

  With this configuration, there is no member that causes mechanical displacement during switch operation other than the elastically deformable plate with the shaft attached thereto, and the switch can be used if a highly durable material such as silicon rubber is used for this elastic plate. It has the effect of extending the life of the device.

  In addition to the combination of the permanent magnet and the magnetic sensing element described above, the conversion means for capturing the change in the switch state may be, for example, arranging a light emitting element and a light receiving element on the substrate and using a part of the shaft as a reflecting surface. Optical displacement detection means may be used.

  As described above, according to the switch device of the present invention, since the switch mechanism can be configured without using a wear member caused by peristaltic movement, it is possible to provide a switch device having a longer life than the conventional one.

  Further, since the shaft body can be assembled and attached to the elastic plate member by press fitting, it can be assembled very easily as compared with the conventional switch mechanism, and the number of assembling steps can be reduced.

Side surface sectional drawing of the switch apparatus which shows embodiment of this invention Perspective view from the bottom of the same appearance External view of coaxial body External view of the same plate material External view of assembly of coaxial body and plate Perspective view with the outer case removed

      Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a side sectional view of a switch device showing an embodiment of the present invention. In FIG. 1, reference numeral 1 is a shaft body made of an insulating resin such as acrylonitrile butadiene styrene, and a permanent magnet 5 is press-fitted and fixed in a hole in the center of the end. Reference numeral 2 denotes an elastic plate material having elasticity such as silicon rubber, and a metal substantially box-shaped plate material mounting case 3 having a hole portion sufficiently larger than the outer diameter of the shaft body 1 at the center, so that an inner side made of metal, etc. It is fixed to the case 4a.

  The Hall element 6 is mounted and fixed on the substrate 7 attached to the inner case 4a via the spacer 8.

  FIG. 2 is an external perspective view of the same case as viewed from below, and the elastic plate member 2 is attached to the inner case 4a by means of a plate member attachment case 3 using attachment screws 9.

  FIG. 3 is an external view of the shaft 1, and the width of the groove provided in the body portion is substantially equal to the thickness of the elastic plate member 2, and the outer diameter of the groove bottom portion is substantially equal to the diameter of the hole penetrating the center of the elastic plate member 2.

  FIG. 4 is an external view of the elastic plate member 2, and a hole having a diameter substantially equal to the outer diameter of the groove bottom portion of the shaft body 1 is provided at the center.

  FIG. 5 is an external view of the assembly of the shaft body 1 and the elastic plate member 2. The shaft body 1 is press-fitted and fixed to the elastic plate member 2 using the elastic deformation of the elastic plate member 2.

  As an assembly order, after the shaft body 1 is pressed into the elastic plate member 2 as shown in FIG. 5, it can be attached and fixed to the inner case 4 a using the attachment screw 9 through the plate member attachment case 3. It is also possible to put only the elastic plate material 2 in the plate material mounting case 3 first and fix it to the inner case 4a using the mounting screws 9, and finally press-fit the shaft body 1 to the elastic plate material 2.

  Thus, the press-fit mounting of the shaft body 1 is very simple and has a high degree of freedom in the assembly order, but at the same time, the shaft body 1 once press-fit mounted can be easily pulled out after the case assembly is completed. Even when a dimensional defect of the shaft body 1 or a magnetic force defect of the permanent magnet 5 occurs, it can be easily replaced, which is extremely useful in process management.

  For example, when it is better to change the length of the shaft body 1 according to the site where it is used, the user can exchange the shaft body 1, which leads to expansion of product functions.

  FIG. 6 is a perspective view in a state where the inner case 4 a is removed, and the Hall element 6 is disposed in the vicinity of the permanent magnet 5 fixed to the end of the shaft body 1.

In FIG. 6, the shaft body 1 is held by the elastic plate material 2 fixed to the inner case 4 a by the plate material mounting case 3, but a force is applied in either the front, rear, left or right direction near the lower end of the shaft body 1. In this case, the shaft body 1 is displaced using the elastic plate member 2 as a pivot.
Due to this displacement, the output voltage level of the Hall element 6 changes due to the change of the magnetic field intensity generated from the permanent magnet 5 applied to the Hall element 6 disposed in the vicinity of the shaft body 1, so that the switch state change is electrically It can be taken out as a signal.

DESCRIPTION OF SYMBOLS 1 Shaft body 2 Elastic plate material 3 Plate material mounting case 4a Inner case 4b Outer case 5 Permanent magnet 6 Hall element 7 Substrate 8 Spacer 9 Fixing screw

Claims (1)

  A plate member that can be elastically deformed and has a through hole, a box-like case in which the plate member is fixed by a fixing member, a rod-shaped shaft body having an outer diameter larger than that of the through hole, and an end portion of the shaft body A permanent magnet and a magnetic sensing element disposed in the box-like case, the shaft body is provided with a groove, and the width of the groove is substantially equal to the plate thickness of the plate material. The outer diameter of the bottom surface portion is substantially equal to the diameter of the through hole, and the shaft member can be pivotally supported by fitting the groove portion of the shaft body into the through hole portion of the plate material. A switch device characterized in that it is used as means for detecting a switch state change by converting a rotational displacement into a change in output voltage by the magnetic sensing element.