KR101680372B1 - Multi-functional switch - Google Patents

Abstract

The present invention is directed to providing a multi-functional switch, wherein the structure of the multi-functional switch according to the present invention comprises a connector (10) coupled to a switching contact (40) connected to an electrical circuit of the device; A switching unit (30) connected to the connector (10) and electrically connected to the switching contact (40); A picking pin (20) provided on an upper surface of the connector (10) so as to be able to move up and down; And an elastic body for resiliently biasing the picking pins 20 to protrude from the upper surface of the connector 10, wherein the connector 10 includes a connector base 12; A base cover 14 having a locking piece 14LP and coupled to the connector base 12; And an eject body (16) for opening the locking piece (14LP) of the base cover (14) so that the locking piece (14LP) is disengaged from the locking groove (18LG) of the return pawl And the switching unit 30 is provided with a locking groove 18LG to which the locking piece 14LP of the base cover 14 is coupled so that the switching unit 14 is connected to the base cover 14 and the connector base 12, And a return pawl (18) for coupling the locking piece (14LP) of the base cover (14) to the locking groove (18LG) in a state of being inserted together with the locking pawl (30).

Description

Multi-functional switch < RTI ID = 0.0 >

The present invention relates to a multi-functional switch, and more particularly, to a new multi-functional switch that can be stably positioned at a stable position due to its satisfactory fixation force when mounted on a fixed object, .

In addition, the present invention provides a new composite switch capable of easily switching the switching unit in all types of switches including the emergency switch, and switching the switching unit into a state in which the switching unit can be easily separated simply by operating the main unit when the switching unit is separated To a functional switch.

The exterior panels of the control boxes of the various machines are equipped with switches for operating the main parts of the machine. On the other hand, an emergency switch is installed in various mechanical devices to prevent a problem caused by a mechanical error or a person's mistake during the process stopping the devices. For example, in the case of a semiconductor manufacturing apparatus, if the semiconductor manufacturing apparatus is stopped due to a mechanical error or a mistake of a person during the process, productivity of the semiconductor, enormous economic loss, and serious situation may occur. Emergency switch is provided.

The switch includes a switch contact electrically connected to a main part inside the machine, an operation button provided in front of the switch contact, a push button built in the switch contact, And a switching part (switching operation part) for switching on / off the internal circuit of the switching contact in accordance with the releasing operation to apply or cut off power to a main part of the mechanical equipment. In other words, among the switches, there are a switching contact electrically connected to the internal circuit of such a switching contact, and an operation for switching on and off the internal circuit of the switching contact in accordance with the push operation or the push- Button. In the case of an emergency switch, there are many such structures.

However, since all kinds of switches including the emergency switch often have insufficient force to be fixed to a mounting object (for example, a mounting panel provided in a control box of a mechanical device or the like) provided in a mechanical device, . For example, in the case of an emergency switch, it is fixed to a mounting panel, which is an object to be mounted. In many cases, when the emergency switch is fixed to the mounting panel, There is a problem such that the fixing structure itself becomes complicated in order to firmly fix the mounting member to the mounting object. In addition, in the switch including the emergency switch, when the switching unit is electrically connected to the internal circuit of the switching contact, the mounting is quick and the means is required to easily and quickly disconnect the switch from the switching contact. When the switching unit is connected to the switching contact, it is difficult to disconnect the switching unit even if the switching unit is coupled by a one-touch method. This is inconvenient and time-consuming due to the separation of the switching unit is required. Thus, the switching unit can be quickly and easily connected There is a need for a means for easily separating the switching unit.

Korean Patent Publication No. 10-2005-0099296 (published on October 13, 2005) Korean Patent Laid-Open No. 10-2006-0068101 (published on June 21, 2006) Domestic Public Utility Model Office 2001-0002061 (Published Jan. 26, 2001)

It is an object of the present invention to provide a new multifunctional switch which is firmly fixed in place without stiffness or the like due to its satisfactory fixing force when mounted on a fixed object, .

In addition, in the present invention, when the switching unit is simply coupled in one-touch manner in all kinds of switches including the emergency switch, and when the switching unit is separated, the switching unit can be easily separated And it is an object of the present invention to provide a new multifunctional switch which is very desirable in terms of workability and the like because the switching part can be easily separated quickly. The present invention can be widely applied to all kinds of switches, though it is easily adopted as an emergency switch capable of easily and quickly disconnecting the switching unit from the switching contact as well as one-touch coupling of the switching unit to the switching contact.

According to an aspect of the present invention, there is provided a connector comprising: a connector base; A base cover having a locking piece and coupled to the connector base; Wherein the base cover has a locking groove to which the locking piece is coupled and is coupled to the switching unit and inserted into the base cover and the connector base together with the switching unit, Paw; And an eject body provided between the connector base and the base cover to open the locking piece of the base cover to convert the locking piece into a detached state in the locking groove of the return pawl. A switch is provided.

The connector base has a first switching portion connection hole penetrating from the upper surface to the bottom surface, and the base cover has a second switching portion connection hole coaxially aligned with the first switching portion connection hole of the connector base And a plurality of locking pieces arranged in the radial direction around the second switching portion connection hole, wherein the plurality of locking pieces of the base cover are arranged in the radial direction in the second switching portion connection hole as the eject body is rotated And the locking piece is detached from the locking groove formed in the return pole.

Wherein the eject body includes a plurality of unlocking block portions arranged radially with respect to a central portion on an upper surface thereof, and the unlocking block portion has an unlocking operation side portion extending in a direction intersecting the rotation direction of the eject body, Wherein the unlocking operation side portion of the unlocking block portion is in contact with the inner surface of the locking piece of the scraper base cover in accordance with the rotation of the eject body in one direction, So that the locking piece is released from the locking groove of the first switching portion connection hole of the connector base and the locking groove of the return pole inserted in the second switching portion connection hole of the base cover .

The locking piece is provided with a locking protrusion (14HP) on the inner circumferential surface so that when the locking protrusion (14HP) is engaged with the locking groove of the return pawl, the locking piece The locking protrusions 14HP are simultaneously opened and released from the locking grooves.

Wherein the eject body has a third switching portion connection hole coaxially aligned with the first switching portion connection hole of the connector base and the second switching portion connection hole of the base cover to have a constant width between the inner peripheral surface and the outer peripheral surface And the returning pole is simultaneously inserted into the first switching portion connection hole, the second switching portion connection hole and the third switching portion connection hole, and the unlocking block portion on the upper surface of the eject body Wherein the unlocking operation side surface portion and the second side surface portion are formed in a straight line shape extending in a direction parallel to a direction of advancing from the inner circumferential surface of the eject body to the outer circumferential surface, Wherein the locking piece of the base cover is provided on one side of the adjacent unlocking block portions of the eject body Locking operating side portion of the locking block portion and the second side surface portion of the other unlocking block portion so that the inner peripheral surface of the locking piece is disposed at a position where the unlocking operation side portion is in contact with the outer peripheral surface of the locking piece, Position.

The ejection body is provided with a rotary operation lever at one side thereof, and the rotary operation lever is exposed to the outside through a lever hole formed between the connector base and the base cover.

The upper cover (17) is coupled to the connector base, and a picking pin is vertically movable on the upper surface of the upper cover (17). The picking pin is inserted into the upper cover And an elastic body for elastically protruding from the upper surface of the elastic member.

The return pawl is further provided with an extension extending radially outward to face the upper end of the picking pin.

The picking pin has a support pin portion whose tip has a sharp peak at an outer peripheral portion of the picking pin gradually decreasing in the direction from the proximal end toward the distal end, and the peak is provided in the longitudinal centerline path of the support pin.

Wherein the picking pin has a supporting pin portion whose tip has a smaller diameter as the outer diameter of the picking pin gradually decreases from the proximal end portion toward the distal end portion and the peak portion is provided in the longitudinal center line path of the supporting pin portion, A first support pin portion having one of the peak portions with respect to the center line of the sink pin; and a second support pin portion disposed on the side of the first support pin portion with respect to the center line, the tip portion of the first support pin portion being located between the tip portion of the first support pin portion And a second support pin portion for forming a stepped portion on the second support pin portion.

Wherein the pinching pin has a supporting pin portion whose tip is gradually reduced in outer diameter from a proximal end portion toward a distal end portion thereof and the peak portion is provided in a longitudinal center line path of the supporting pin portion, And a plurality of pin protrusions arranged in the radial direction with respect to the base.

The movable contact piece provided on the second eject body is exposed to the outside of the switching contact and is disposed at a position opposite to the movable contact piece of the second eject body And wherein the connector base is provided with a mounting engagement hole on both sides thereof for respectively engaging with the movable locking piece and the locking locking piece of the second ejecting body.

According to the present invention, there is also provided a connector, comprising: a connector coupled to a switching contact connected to an electrical circuit of a device; A switching unit connected to the connector and electrically connected to the switching contact; A picking pin movably provided on an upper surface of the connector; And an elastic body for resiliently biasing the picking pin to protrude from the upper surface of the connector.

According to the present invention, there is also provided a connector comprising: a connector base having a first switching unit connection hole for inserting a switching unit having an operation button of a switch; A base cover having a second switching portion connection hole aligned with the first switching portion connection hole of the connector base and having a locking piece around the second switching portion connection hole and coupled to an upper side of the connector base; And an eject body rotatably coupled between the base cover and the connector base so as to open the locking piece of the base cover in a radially outward direction of the second switching portion connection hole by a rotation operation thereof. A connector capable of being easily detached and attached to the switching unit is provided.

In the present invention, the picking pins are provided on the main connector to which the switching unit is connected. The picking pins are configured to protrude from the upper surface of the connector by the elastic force of the elastic body. The picking pins have support pin portions having sharp- The connector and the switching contact and the switching unit are fixed in a state in which the supporting pin of the picking pin digs a predetermined depth into the surface of the object to be mounted such as a mounting panel of a mechanical apparatus or the like due to the elastic force of the elastic body. Can be more firmly fixed to the mounting object.

In addition, the present invention can easily separate the switching unit by rotating the eject body provided in the connector, and when the switching unit is engaged, the return pole can be inserted into the switching unit connection hole of the connector, It is effective.

1 is a perspective view showing a disassembled state of a main part of a switch according to the present invention;
2 is an external perspective view of a switch according to the present invention.
FIG. 3 is a perspective view showing a state in which the switching unit, which is the main part shown in FIG. 2,
Fig. 4 is a perspective view of the connector base shown in Fig.
Fig. 5 is a plan view of Fig. 4
6 is a perspective view of the base cover shown in Fig.
Fig. 7 is a plan view of Fig. 6
Fig. 8 is a perspective view of the eject body shown in Fig.
Fig. 9 is a plan view of Fig. 8
10 is a perspective view showing the structure of an eject body, a base cover and a picking pin portion,
11 and 12 are plan views showing a state in which the locking piece of the base cover is opened by the eject body shown in Fig.
Figs. 13 and 14 are longitudinal sectional views showing a main part structure of the switch according to the present invention shown in Fig. 2 and a state in which a locking piece of the base cover is opened
15 and 16 are side views schematically showing a coupling structure of a second ejector body and a connector base, which are another essential part of the present invention.
17 is a plan view of a connector adopting a modified embodiment of a picking pin which is a main part of the present invention
18 is a plan view of a connector adopting another modified embodiment of a picking pin which is a main part of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected,""coupled," or "connected. &Quot;

Referring to the drawings, the present invention comprises a connector 10 coupled to a switching contact 40 connected to an electrical circuit of a device, a switching part 30 connected to the connector 10 and electrically connected to the switching contact 40, A picking pin 20 provided on the upper surface of the connector 10 so as to be able to move up and down and an elastic body that protrudes from the upper surface of the connector 10 such that the picking pin 20 protrudes from the upper surface of the connector 10. Here, the term " apparatus " in the present invention refers to all types of mechanical devices to which switches, including emergency switches, are mounted. The present invention also provides a connector comprising a connector base coupled to a switching contact and a base cover coupled to the connector base and having a locking piece, A return pawl 18 provided in the switching unit 30 and a locking pawl 18LG in which the locking pawl 14LP of the connector base 12 and the base cover 14 are coupled, And the ejection body 16 that opens the locking piece 14LP of the base cover 14 and turns the locking piece 14LP in the locking groove 18LG of the return pawl 18 into a detached state Respectively. It is to be noted that the present invention is mainly intended to provide an emergency switch, but it can be widely applied to other switches in addition to an emergency switch. It should be understood that the present invention describes an emergency switch as an embodiment.

In the present invention, the switching contact 40 includes a contact body provided with a terminal portion. To the terminal portion of the switching contact 40, a wire connected to an electric circuit of an apparatus using electricity such as a mechanical device is connected. At this time, the terminal portion is connected to the conductive clip connected to the electric wire between the terminal bolt and the screw, so that the switching contact 40 can be electrically connected to the electric circuit. The present invention is a switch configured to be attachable to and detachable from a switching contact (40), which is a main part, and is mainly employed in an emergency switch. The switching unit 30, which is a main part of the switch of the present invention, includes a return pawl 18 in the form of a sleeve having a hollow portion therein, a return pawl 18 provided in the return pawl 18, A contactor provided inside the return pawl 18 to be disposed at a lower end of the insert pawl 18; a contactor provided to cover the upper end and the outer peripheral surface of the return pawl 18, And a push button 32 (push and return button).

When the push button 32 of the emergency switch is pressed, the push button 32 presses the contact button 44 provided on the switching contact 40 so that the switching contact 40 ) By opening the electrical circuit connected between the terminals of the emergency switch. The push button 32 and the contactor are returned to the original position and the contact button 44 of the switching contact 40 is returned to the original position by pushing the push button 32 again after taking a normal action in the emergency stop state of the mechanical device, Thereby short-circuiting the electric circuit connected between the terminal portions of the switching contact 40. [ The emergency stop of the mechanical device or the like by blocking the electric circuit by the switching contact 40 by depressing the emergency switch as described above is a well-known structure, and a detailed description thereof will be omitted.

The movable contact piece 40 is provided with a second eject body 42 and the movable contact piece 42a provided on the second eject body 42 is exposed to the outside of the switching contact 40 . The second eject body 42 is coupled to the contact body constituting the body of the switching contact 40 with reference to the hinge portion of the base end so that the second eject body 42 is positioned in the up and down direction of the switching contact 40 As shown in FIG. The distal end of the second eject body 42 is exposed to the outside of the contact body. The second eject body 42 exposed to the outside of the contact body is provided with a movable blocking piece 42a. When the second eject body 42 is rotated with respect to the hinge portion, the movable blocking stone piece 42a rotates and protrudes to the outer side of the switching contact 40. [ The second eject body 42 is rotated to return to its original position by a return spring when the distal end side of the second eject body 42 is pivoted toward the inside of the switching contact 40 with respect to the hinge portion. That is, the movable stopper piece 42a of the second eject body 42 is rotated so as to be exposed to the outside of the switching contact 40. At this time, the return spring is made of a substantially V-shaped leaf spring so that one spring piece of the return spring is connected to the contact body and the return spring is arranged so that the other spring piece is in contact with the inner surface of the second eject body When the second eject body 42 is pivoted toward the inside of the contact body with respect to the hinge portion of the base end portion and the pressing force of the V-shaped return spring is pressed and the second eject body 42 is released, The eject body 42 can be pivotally protruded (projected in place) with reference to the base end side hinge portion of the second eject body 42 by the elastic force of the return spring. At this time, the return spring is formed in a V shape so that one spring piece is accommodated and coupled to the inside of the second eject body 42, and the other spring piece of the return spring contacts the support provided in the switching contact 40 So that the resilient restoring force of the return spring acts on the second eject body 42 because the second eject body 42 is pressed toward the inside of the switching contact 40 by pushing the hinge portion of the base end as the center, When the force for pressing the second eject body 42 is released, each spring piece of the return spring is unfolded in the state where the spring pieces of the return spring are pressed. Therefore, the elastic force of the return spring causes the second eject body 42 Can be pivoted and protruded to the original position with reference to the hinge portion of the base end portion. The upper surface of the movable stopper piece 42a of the second eject body 42 is formed as a guide surface inclined downward from the upper portion of the switching contact 40 downward. A second eject body 42 is provided on one side of the contact body and a connector base 12 is coupled and supported on a face opposite to the side where the second eject body 42 of the contact body is formed. And a locking protrusion piece 40a is provided on the coupling support protrusion of the connector base 12. [ The upper surface of the fixed contact piece 40a also has a guide surface inclined downward from the upper portion of the switching contact 40 downward. In addition, a post-type insert bar is provided at the center of the upper surface of the contact body, and a hollow contactor inside the return pawl 18 to be described later is inserted into the insert bar. When the push button 32 of the emergency switch is pressed, the contact button is pressed by the push button 32 to switch the contact. The contact button 44 provided in the contact 40 is pressed to open the electric circuit connected between the terminal portions of the switching contact 40. [

The return pawl 18 is a circular sleeve structure having a circular section and a hollow inside. The return pawl 18 is coupled to the outer circumferential surface of the return pawl 18 of the switching unit 30 as described above, and the return pawl 18 insert and the return pawl 18 are concentrically arranged.

The return pawl 18 has a locking piece 14LP extending from a lower end to an upper end thereof and has a lower locking groove 18LG forming a top and a lower spacing in the locking piece 14LP, And the locking groove 18LG is formed on the outer peripheral surface of the return pawl 18 by the upper locking groove 18LG forming piece. The bottom surface of the lower locking groove 18LG is formed with a surface inclined upwardly to the upper end of the return pawl 18 and the bottom surface of the upper locking groove 18LG is formed to be orthogonal to the length direction of the return pawl 18. [ As shown in FIG.

The return pawl 18 provided in the switching unit 30 is connected to the first switching unit connection hole of the connector base 12 and the second switching unit connection hole of the base cover 14, 3 switching part.

The connector base 12 has a rectangular box-like structure whose lower portion is opened by side walls provided at front, rear, left and right peripheral portions. The connector base 12 has two side wall portions opposed to each other and provided with a locking hole fitting hole. The engaging hole engaging hole has a substantially rectangular hole shape. Further, an ejection body 16 mounting groove is provided on the upper surface of the connector base 12. The mounting groove of the eject body 16 has a circular groove shape. At one side of the eject groove of the eject body 16, a lever rotation operation space is provided. And the lever rotation operation space is pulled to one side of the mounting groove of the eject body 16. On the bottom surface of the eject groove of the eject body 16, a guide piece of the eject body 16 is provided. The eject guide body 16 has an annular projection structure. The connector base 12 is provided with a button engagement hole communicated from the upper surface to the lower surface of the eject groove 16 of the eject body 16. The connector base 12 is provided with a fastener hole communicated from the upper surface to the lower surface. Since the connector base 12 is in the shape of a rectangular box, the fastener holes are provided at positions adjacent to the four corners of the connector base 12.

An eject body (16) is rotatably coupled to the connector base (12). The connector base 12 is provided with an eject groove 16 in the form of a circular groove and the eject body 16 is formed in the shape of a circular ring so as to be inserted into the upper surface of the connector base 12, The body 16 is accommodated and becomes rotatable. At this time, an annular rotating guide groove is provided on the bottom surface of the eject body 16, and the rotation guide groove is formed in the bottom surface of the eject body 16 of the connector body 12, . The rotation guide groove is rotated relative to the rotation guide member of the eject body 16 of the connector base 12 when the eject body 16 is rotated. The eject body 16 is guided so as to be pivoted at a predetermined position by the pivotal guide piece of the eject body 16 of the connector base 12. [ Further, a lever is projected to one side of the eject body 16. The lever of the eject body 16 is seated in the lever turning operation space of the connector base 12.

In addition, the eject body 16 has a plurality of unlocking block portions 16UB arranged on the upper surface in the radial direction with respect to the central portion. At this time, the unlocking block portion 16UB is a block structure protruding upward from the upper surface of the eject body 16. The unlocking block portion 16UB is formed in a direction intersecting the rotation direction of the ring-shaped eject body 16 And has an extended unlocking working side portion 16S1. The unlocking block portion 16UB has an unlocking operation side face portion 16S1 and a second side face portion 16S2 which are parallel to each other when viewed from the upper surface of the eject body 16. The unlocking operation side face portion 16S1 has an inner end portion and an outer end portion And the second side portion 16S2 also has an inner side and an outer side. At this time, the angle between the normal line passing through the outer end of the second side surface portion 16S2 of each unlocking block portion 16UB and the second side surface portion 16S2 in the normal line passing the outer circumferential surface of the eject body 16 is 80 - And the angle between the normal line passing through the inner end of the second side surface portion 16S2 of each unlocking block portion 16UB and the angle between the normal line passing through the inner surface of the eject body 16 and the angle between the second side surface portion 16S2 A normal line passing through an outer end of an unlocking operation side portion 16S1 of each unlocking block portion 16UB in a normal line passing through the outer circumferential surface of the eject body 16, The angle between the locking operating side portions 16S1 is in the range of 35 to 40 占 and the angle between the inner side of the unlocking operation side portion 16S1 of each unlocking block portion 16UB in the normal line passing through the inner circumferential surface of the eject body 16 How to pass And wherein the angle between the second side surface (16S2) are in a range of 0 ~ 1 °. The angle between the normal line passing through the inner end of the unlocking operation side portion 16S1 of each unlocking block portion 16UB and the second side portion 16S2 in the normal line passing the inner circumferential surface of the eject body 16 is 0 Means that the normal line passing through the inner end of the unlocking operation side portion 16S1 of the unlocking block portion 16UB coincides with the unlocking operation side portion 16S1 on the same line.

The width between the inner end and the outer end of the second side portion 16S2 in each unlocking block portion 16UB is made smaller than the width between the inner end and the outer end of the unlocking operation side portion 16S1. That is, the unlocking block portion 16UB on the upper surface of the eject body 16 has another second side portion 16S2 at a position opposite to the unlocking operation side portion 16S1, and the unlocking operation side portion 16S1 The second side surface portion 16S2 is formed of a straight line surface extending in a direction parallel to the direction of advancing from the inner circumferential surface to the outer circumferential surface of the eject body 16 and the unlocking operation side surface portion 16S1 and the second side surface portion 16S2 However, the width between the inner end and the outer end of the unlocking operation side face 16S1 is larger than the width between the inner end and the outer end of the second side face 16S2.

The eject body 16 is formed in a ring shape having a constant width from the inner circumferential surface to the outer circumferential surface. Therefore, the eject body 16 has the third switching portion connection hole. The third switching portion connection hole of the eject body 16 is coaxially aligned with the first switching portion connection hole of the connector base 12 and the second switching portion connection hole of the base cover 14 described later. Therefore, the switching portion 30 is simultaneously inserted into the first switching portion connection hole, the second switching portion connection hole, and the third switching portion connection hole. That is, the return pawl 18 provided in the switching unit 30 is simultaneously inserted into the first switching unit connection hole, the second switching unit connection hole, and the third switching unit connection hole. At this time, the unlocking block portion 16UB on the upper surface of the eject body 16 has another second side portion 16S2 at a position opposite to the unlocking operation side portion 16S1, and the unlocking operation side portion 16S1 The second side surface portion 16S2 is formed of a straight line surface extending in a direction parallel to the direction of advancing from the inner circumferential surface to the outer circumferential surface of the eject body 16. The locking piece 14LP of the base cover 14, Between the unlocking operation side face portion 16S1 of one unlocking block portion 16UB and the second side face portion 16S2 of the other unlocking block portion 16UB among the neighboring unlocking block portions 16UB adjacent to each other . The inner circumferential surface of the locking piece 14LP of the base cover 14 is disposed at a position where the unlocking operation side surface portion 16S1 contacts and the outer circumferential surface of the locking piece 14LP is disposed at a position facing the second side surface portion 16S2 . On the other hand, the eject body 16 is provided with a rotation operation lever at one side thereof, and the rotation operation lever is exposed to the outside through a lever hole formed between the connector base 12 and a base cover 14 to be described later.

On the upper surface of the connector base 12, a base cover 14 covering the eject body 16 is disposed. The base cover 14 has a structure in which the support leg 14SL extends downward. In addition, a second switching portion connection hole is provided at the center of the base cover 14. The first switching portion connection hole communicates from the upper surface of the base cover 14 to the lower surface. A locking piece 14LP is provided around the insertion hole of the first switching unit 30 of the base cover 14. The locking pieces 14LP are in the form of a columnar piece when viewed in plan view and are arranged at regular intervals along the circumferential direction around the second switching unit connection hole. And a plurality of locking pieces 14LP are disposed circumferentially around the first switching portion connection holes. The locking piece 14LP is connected at its upper end to the bottom surface of the base cover 14 so that the locking piece 14LP can be opened at the lower end with respect to the center of the first switching portion connection hole. The locking piece 14LP is provided with a locking projection 14HP on its inner peripheral surface. The locking projection 14HP is formed in a columnar projection shape so as to correspond to the sectional shape of the locking piece 14LP. Further, the latching protrusion 14HP protrudes in the direction of the center of the second switching portion connection hole. The locking projection 14HP protrudes inward in the direction orthogonal to the longitudinal direction (vertical direction) of the locking piece 14LP. The locking piece 14LP of the base cover 14 is engaged with the unlocking operation side portion 16S1 of one unlocking block portion 16UB among the adjacent unlocking block portions 16UB of the eject body 16, And the second side portion 16S2 of the other unlocking block portion 16UB. The inner circumferential surface of the locking piece 14LP of the base cover 14 is disposed at a position where the unlocking operation side surface portion 16S1 contacts and the outer circumferential surface of the locking piece 14LP is disposed at a position facing the second side surface portion 16S2 . The locking protrusion 14HP protruding from the inner circumferential surface of the locking piece 14LP is configured such that the bottom surface is located above the lower end of the locking piece 14LP so that the lower portion of the locking protrusion 14HP Locking operation block portion 16UB of the unlocking block portion 16UB adjacent to the ejection body 16 and the unlocking operation side portion 16S1 of the other unlocking block portion 16UB Two side portions 16S2. Meanwhile, the base cover 14 is provided with an eject body supporting piece 16ES between the locking pieces 14LP. The inner circumferential surface of the locking piece 14LP of the base cover 14 is disposed at a position where the unlocking operation side surface portion 16S1 contacts and the outer circumferential surface of the locking piece 14LP is disposed at a position facing the second side surface portion 16S2 will be. The upper end of the eject body supporting piece 16ES is connected to the bottom surface of the base cover 14. The eject body (16) extends in the vertical direction of the base cover (14). The base cover 14 is formed in a rectangular block shape. The four corners of the base cover 14 are provided with concave grooves in the direction of the center of the second switching portion connection hole.

As described above, the return pawl 18 provided in the switching unit 30 is connected to the first switching unit connection hole of the connector base 12, the second switching unit connection hole of the base cover 14, The locking protrusion 14HP provided on the inner circumferential surface of the base cover 14 is inserted into the third switching portion connection hole of the return pawl 17 by the locking of the outer circumferential surface of the return pawl 18. [ Is inserted into the locking groove 18LG formed by the groove forming piece 18LF to maintain the locking state in which the return pawl 18 is held by the locking projection 14HP of the locking piece 14LP of the base cover 14. [ At this time, the lower end of the locking projection 14HP is formed as an upward inclined surface to the upper end of the base cover 14 having the locking piece 14LP. Preferably, the upper surface of the locking projection 14HP is formed as a plane orthogonal to the up-down direction of the base cover 14 so as to abut the bottom surface of the upper locking groove 18LG.

The base cover 14 is accommodated in the upper cover 17. At this time, in the present invention, the upper cover 17 is composed of the lower first upper cover 17A and the upper second cover 17B.

The first upper cover 17A has a rectangular box-like structure whose lower portion is opened by side walls provided at front, rear, left and right sides. A fastening boss is provided on the bottom surface of the first upper cover 17A so as to be adjacent to the four corner portions. An elastic body receiving groove is provided inside the fastening boss. The elastic receiving groove communicates with the upper surface of the first upper cover 17A. The fastening boss has a fastening hole (bolt fastening hole) communicating with the inner bottom surface of the elastic body receiving groove at the lower end.

Therefore, the first upper cover 17A is fastened to the fastening holes formed in the fastening bosses of the first upper cover 17A and the connector bases 14A, When a fastener (such as a bolt) is fastened on the bottom surface of the connector base 12 so as to be simultaneously engaged with the fastening hole formed in the fastening hole and the fastening hole formed in the first upper cover 17A, The eject body 16 and the base cover 14 may be interposed between the connector base 12 and the first upper cover 17A. At this time, each of the eject body supporting pieces 16ES provided on the base cover 14 is disposed at the upper surface position of the eject body 16 so that the eject body 16 can not be pushed toward the base cover 14, Lt; / RTI > The lower end portion of the eject body supporting piece 16ES is disposed above the upper surface of the unlocking block portion 16UB protruding from the upper surface of the eject body 16 to support the eject body 16 so as not to be heard toward the base cover 14 do. In addition, the first upper cover 17A is provided with a third lower switching portion connection hole. The third lower switching portion connection hole communicates from the upper surface of the first upper cover 17A to the lower surface.

In addition, the first upper cover 17A is provided with a projection engaging hole for engaging with an engaging projection of a second upper cover 17B to be described later. The projection engaging hole communicates with the bottom surface from the upper surface of the first upper cover 17A. The projection engaging hole is provided at a position away from the fastening boss.

An elastic body is seated in the elastic body receiving groove of the first upper cover (17A). In the present invention, the elastic body is composed of a spring. The coil-shaped spring is inserted into the elastic receiving groove of the first upper cover 17A. At this time, the spring 22 is configured so that at least two springs having different outer diameters are coupled in a concentric shape. That is, by inserting the inner placement spring 22B having a smaller outer diameter inside the outer placement spring 22A having a larger outer diameter, the outer placement spring 22A and the inner placement spring 22B having two different outer diameters are formed in a concentric shape As shown in FIG. In addition, the spiral portions of the outer placement spring 22A and the inner placement spring 22B are configured to be arranged to be intersecting with each other. When the spiral portion of the outer placement spring 22A is positioned at a higher position on the right side than the left side as viewed from the side of the outer placement spring 22A and the inner placement spring 22B, The left side is positioned higher.

And a picking pin 20 is coupled to a part of the upper end side of the spring. In the present invention, the picking pin 20 is provided at its lower side with an elastic coupling sleeve portion having a relatively larger outer diameter, and the elastic coupling sleeve portion is engaged with a part of the upper end side of the spring. In addition, the spring enters the elastic receiving groove formed in the first lower cover, so that the lower elastic connector sleeve of the picking pin 20 enters the elastic receiving groove of the first lower cover. The upper surface of the elastic coupling sleeve portion is flush with the upper surface of the first lower cover. That is, the height difference between the upper surface of the elastic coupling sleeve portion of the picking pin 20 and the upper surface of the first lower cover is prevented.

The picking pin 20 is provided with a support pin portion 20SP having a tip portion 20EP having a smaller tip diameter from the proximal end toward the distal end. The support pin portion 20SP has a conical shape with a pointed tip portion 20EP. In the present invention, the support pin portion 20SP has a conical shape. Therefore, the tip portion 20EP is provided in the longitudinal centerline path of the support pin portion 20SP. The tip portion 20EP allows the surface of the mounting panel (the mounting panel provided in the control panel of the machine device) of the present invention to smoothly penetrate the supporting pin portion 20SP of the picking pin 20. The return pawl 18 of the switching unit 30 further includes an extension extending radially outward to face the upper end of the picking pin 20. The sharp tip portion 20EP provided at the tip of the four picking pins 20 is disposed at a position facing the bottom surface of the extension portion of the return pawl 18. [

Like the first upper cover 17A, the second upper cover 17B has a rectangular box-like structure whose lower portion is opened by side walls provided at front and rear left and right peripheral portions. However, the volume of the second upper cover 17B is larger than the volume of the first upper cover 17A so that the first upper cover 17A can be received therein. The second upper cover 17B is provided with a pin coupling hole at a position adjacent to the four corner portions. The second upper cover 17B covers the first upper cover 17A, and the picking pins 20 are engaged with the pin coupling holes. And the picking pin 20 protrudes from the upper surface of the second upper cover 17B. The inner diameter of the pin coupling hole is smaller than the inner diameter of the elastic receiving groove of the first upper cover 17A so that the upper surface of the elastic coupling sleeve of the picking pin 20 on the lower side of the second upper cover 17B, So that the picking pins 20 can be stably lifted up from the upper surface of the second upper cover 17B without being released to the upper surface of the second upper cover 17B. In addition, the second upper cover 17B is provided with a third upper switching portion connection hole communicated from the upper surface to the lower surface.

The first cover 17A and the second cover 17B cover and protect the eject body 16 and the base cover 14 while simultaneously forming the upper cover 17 for supporting the picking pins 20 do. The third lower switching portion connection hole of the first upper cover 17A and the third upper switching portion connection hole of the second upper cover 17B constitute the third switching portion connection hole of the upper cover 17.

In addition, a coupling protrusion is provided on the bottom surface of the second upper cover 17B. And the engaging projection is disposed in an area between the third upper switching portion connecting hole and the pin engaging hole. Therefore, since the engaging projection is fitted into the projection engaging hole formed in the first upper cover 17A in a state in which the second upper cover 17B covers the first upper cover 17A, The first upper cover 17A is prevented from being separated from the first upper cover 17A. At this time, the outer diameter of the coupling protrusion on the bottom surface of the second upper cover 17B is larger than the inner diameter of the protrusion coupling hole of the first upper cover 17A, so that the coupling protrusion is tightly coupled to the protrusion coupling hole, The second upper cover 17B on the first upper cover 17A is maintained in a state of firmly covering the first upper cover 17A unless the cover 17B is intentionally pulled over the first upper cover 17A .

The present invention having the above-described configuration includes, as main parts, a switching contact 40, a connector 10, and a switching unit 30. At this time, the connector 10 includes a connector base 12, an eject body 16, a base cover 14, and an upper cover 17. The switching unit 30 is provided with a return pawl 18.

A process of fixing the switch of the present invention to the mounting panel will now be described.

The switching contact 40 and the connector 10 are disposed at a position on one side of the mounting panel and connected to the switching unit connection hole of the connector 10, The second switching portion connection hole of the connection hole and the base cover 14 and the third switching portion connection hole of the upper cover 17 are aligned with the insertion hole of the switching portion 30 formed on the mounting panel.

Next, the return pawl 18 provided in the switching unit 30 is inserted into the switching unit connection hole provided in the connector 10 through the insertion hole of the switching unit 30 of the mounting panel. Since the locking projection 14LP of the connector 10 (specifically, provided on the base cover 14) is engaged with the locking groove 18LG provided on the outer peripheral surface of the return pawl 18, The connector 10 and the switching unit 30 are connected in a state in which the switching contact 40 and the connector 10 are disposed on one side with respect to the mounting panel and the switching unit 30 is disposed on the other side . At this time, the picking pin 20 extending to the upper surface of the connector 10 has a supporting pin portion 20SP having an apex 20EP whose tip is gradually reduced in outer diameter from the proximal end toward the distal end, The picking pin 20 is elastically deformed and is connected to the connector 10. When the returning pawl 18 of the picking pin 20 is coupled with the switching unit 30 connected to the connector 10, The support pin portion 20SP with the head portion 20EP can dig into the mounting panel to securely fix the picking pin 20 to the mounting panel. A sealing ring made of rubber or the like is provided on the bottom surface of the return pawl 18 (that is, the surface facing the picking pin 20), so that the bottom surface of the return pawl 18 and the sealing ring It is possible to press-contact the surface of the mounting panel by the force of an elastic body (spring) which exerts an elastic force so that the picking pin 20 can be inserted into the mounting panel.

The switching unit 30 is disconnected from the connector 10 by releasing the locking state of the return pawl 18 provided in the switching unit 30, The process of separating from

The locking piece 14LP provided on the base cover 14 of the connector 10 is coupled to the locking groove 18LG formed on the outer peripheral surface of the return pawl 18 of the switching unit 30, ). The ejection body 16 is pivoted by gripping a lever that protrudes from the one side of the eject body 16 to the outside of the connector 10. [

The ejection body 16 is rotated so that the unlocking operation side portion 16S1 which is one side of the unlocking block portion 16UB provided on the upper surface of the eject body 16 and the second side portion 16S2 which is the other side, Locking unlocking side 16S1 of the unlocking block 16UB is locked with the locking of the base cover 14 during the rotation of the eject body 16. [ Since the area for pushing the locking piece 14LP from the central portion (that is, the central portion of the base cover 14) gradually increases in the state of being in contact with the inner peripheral surface of the piece 14LP, The locking pieces 14LP of the inner cover 14 spread radially outward (i.e., in the direction away from the center of the base cover 14). More specifically, the stumbling block protruding from the inner peripheral surface of the locking piece 14LP is disposed on the upper surface of the unlocking block portion 16UB of the eject body 16, and the unlocking block portion 16UB The inner end of the side portion 16S1 is disposed on a rotation locus of the locking piece 14LP so that the lower portion of the locking piece 14 can pass while the unlocking operation side portion 16S1 is in contact therewith, The unlocking operation side portion 16S1 of the unlocking block portion 16UB rotates and slips along the inner circumferential surface of the lower portion of the locking stone piece so that the locking piece 14LP is pushed outward from the center portion of the base cover 14 The locking grooves 18LG provided on the outer circumferential surface of the return pawl 18 of the switching portion 30 are extended as the locking pieces 14LP extend outward from the central portion of the base cover 14, ) Books are out. The unlocking state is such that the engaging stones provided on the locking pieces 14LP of the base cover 14 are engaged with the locking grooves 18LG of the outer peripheral surface of the return pawl 18 of the switching unit 30. [

The locking pieces 14LP of the base cover 14 holding the return pawl 18 of the switching unit 30 are spread radially outward from the outer peripheral surface of the return pawl 18 and the locking grooves 14LP of the return pawl 18 18LG), the switching unit 30 and the return pawl 18 can be pulled to separate the switching unit 30 from the connector 10.

When the pressing force for releasing the switching body 30 from the connector 10 and releasing the pressing force for rotating the eject body 16 is released, the locking pieces 14LP of the base cover 14 are retracted by the self- The portion of the locking piece 14LP below the locking projection 14LP in the direction in which the ejection body 16 is rotated and the portion in which the locking piece 14LP is lowered in the process of returning to the original position Locking operation side portion 16S1 of the unlocking stone piece in the opposite direction so that the eject body 16 is automatically moved by the force that each locking piece 14LP of the base cover 14 returns to the original position (Return) to its original position. Since the base cover 14 itself is made of a plastic material such as synthetic resin and the upper end portion of the locking piece 14LP is integrally connected to the bottom surface of the base cover 14, the locking pieces 14LP are opened So that the locking pieces 14LP can be retracted to their original positions by the self-elastic return force, so that the eject body 16 can be returned to its original position.

According to the present invention, the switching contact (40) provided on one side with respect to the mounting panel and the switching unit (30) on the other side of the mounting panel are connected to the connector (10) The switching member 30 is electrically connected to the switching contact 40 so that the switching unit 30 can be separated from the connector 10 when necessary and the mounting object 2 (For example, a mounting panel of a mechanical device, etc.), the effects of the present invention are as follows.

1. A picking pin 20 is provided on a connector 10 to which a switching unit 30 is connected and the picking pin 20 is configured to protrude from the upper surface of the connector 10 by an elastic force of the elastic body, The picking pin 20 is provided with a support pin portion 20SP having a pointed tip portion 20EP so that the support pin portion 20SP of the picking pin 20 is fixed to the mounting object 2 The switching contact 40 and the switching unit 30 are fixed in a state where the connector 10, the mounting panel, and the like are pinched at a predetermined depth. Thus, the switch of the present invention is more firmly fixed to the mounting object 2 So that it can be fixed.

2. The switching unit 30 can be easily separated by rotating the eject body 16 provided on the connector 10. When the switching unit 30 is engaged, the return pawl 18 is connected to the connector 10 The switching unit 30 can be easily attached to and detached from the switching unit connection hole.

3. At least two springs having different outer diameters are connected in a concentric circular shape so that the elastic force applied to the picking pin 20 can be twice or more, (The mounting panel provided on the control panel of the machine or the like) to which the switch of the present invention is fixed can be doubled or more, and the picking pin 20 can be inserted into the mounting panel The function of fixing the switch of the present invention by allowing the picking pin 20 to penetrate the mounting panel as much as twice the force is obtained.

4. The spring for resiliently urging the picking pin 20 to protrude from the upper surface of the connector 10 is configured such that the spirals of the outer placement spring 22A and the inner placement spring 22B having different outer diameters cross each other, The spiral portion of the placement spring 22A and the spiral portion of the inner placement spring 22B are not twisted or entangled with each other so that the case where the elastic force of the outer placement spring 22A (and the inner placement spring 22B) The reliability of the spring is improved and reliability of operation of the spring is high so that each picking pin 20 penetrates into the mounting panel and reliability of mounting the switch of the present invention is further increased.

5. The connector base 12 of the connector 10 is provided with two engaging holes in opposite side walls thereof and the switching contact 40 has a second eject body 42 on one side of the contact body While the second eject body 42 is provided with the movable stopper piece 42a and the fixed contact piece 40a is provided on the surface of the contact body opposite to the surface on which the second eject body 42 is formed Is formed in the other sidewall of the connector base (12) by fitting one of the locking pawl pieces (40a) of the switching contact (40) into an engaging pawl engaging groove formed in one side wall of the connector base (12) Since the connector base 12 can be coupled to the switching contact 40 by engaging the movable engagement piece 42a of the second eject body 42 of the second ejection body 42 of the switching contact 40 with the engagement groove, The combination of the contact 40 and the connector 10 It belongs and it is easy. When the second eject body 42 provided on the switching contact 40 is pressed, the movable stopper piece 42a is detached from the one-side engagement pawl engaging groove of the connector base 12, Disconnection from the contact 40 is also quick and easy. At this time, the movable stopper piece 42a of the second eject body 42 is formed as a guide surface whose top surface is inclined downward, so that the engaging pawl engaging groove of one side wall of the connector base 12 is engaged with the engaging recess of the switching contact 40 The lower end of the other side wall portion of the connector base 12 is pushed in contact with the guide surface of the upper end portion of the movable stopper piece 42a of the second eject body 42 in a state where the lower end of the other side wall portion of the connector base 12 is fitted The second eject body 42 is retracted to the inside of the switching contact 40 and the second eject body 42 is returned when the movable hook piece 42a is brought into contact with the hook hole of the connector base 12, The engagement of the connector 10 and the switching contact 40 is facilitated since the return spring of the spring automatically enters and engages with the engaging groove of the connector base 12.

17 is a plan view of a connector 10 employing a modified embodiment of a picking pin 20, which is a major part of the present invention. 17, the picking pin 20 has a support pin portion 20SP having a tip portion 20EP having a sharp tip with its outer diameter gradually decreasing from the proximal end toward the distal end, And the support pin part 20SP includes a first support pin part 20SP1 having a tip portion 20EP with respect to the center line of the picking pin 20, And a second support pin portion 20SP2 which is disposed on the side of the first support pin portion 20SP1 with respect to the center line and has a tip portion formed with a step between the tip portion 20EP of the first support pin portion 20SP1 and the second support pin portion 20SP2, .

17, in the state in which the support pin 20SP of the picking pin 20 digs into the surface of the mounting object 2, the flat surface portion of the first supporting pin portion 20SP1 contacts the surface of the mounting object 2 (For example, when the switching unit 30 of the emergency switch is pushed and then turned on), the first and second switching units 30 and 30 are turned on and off, Since the flat surface portion of the support pin portion 20SP1 has a large latching action, it is possible to more reliably prevent the rotation of the mounting object 2 even when the switching portion 30 is rotated and operated.

18 is a plan view of the connector 10 employing another modified embodiment of the picking pin 20 which is the main part of the present invention. 18, the picking pin 20 is provided with a support pin portion 20SP having a tip portion 20EP having a sharp tip with its outer diameter gradually decreasing from the proximal end toward the distal end, The support pin portion 20SP includes a plurality of pin protrusions 20PR disposed in the radial direction with respect to the tip portion 20EP. The plurality of pin flakes 20PR are arranged in a star shape with respect to the tip portion 20EP having a sharp tip.

In the embodiment of the present invention shown in Fig. 18, in the state in which the respective pin projection pieces 20PR forming the support pin part 20SP of the picking pin 20 dig into the surface of the mounting object 2, When the switching unit 30 is rotated and operated as described above (that is, when the switching unit 30 of the emergency switch is pressed down) The operation of the switching unit 30 according to the present invention is also applied to the case of Fig. 18, since the respective pin projection pieces 20PR constituting the support pin unit 20SP also have a greater engagement with the mounting object 2, It is possible to more reliably prevent the case of returning from the mounting object 2 when operating.

The specific embodiments of the present invention have been described above. It is to be understood, however, that the scope and spirit of the present invention is not limited to these specific embodiments, and that various modifications and changes may be made without departing from the spirit of the present invention. If you have, you will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

10. Connector 12. Connector Base
12mH. Mounting coupling hole 14. Base cover
14LP. Locking Section 16. Ejection Body
16UB. Unlocking block section 16S1. Unlocking Operation Side
16S2. The second side portion 18. Return Foul
18LG. Rocking Home 20. Pick Singh
20SP. Support pin 20EP. Tip
20SP1. The first support pin portion 20SP2. The second support pin portion
20PR. Pin stones 22. spring
30. Switching part 40. Switching contact
40a. Fixed obstacle piece 42. Second eject body
42a. Moving obstacle piece

Claims (12)

A connector (10) coupled to a switching contact (40) connected to an electrical circuit of the device;
A switching unit (30) connected to the connector (10) and electrically connected to the switching contact (40);
A picking pin (20) provided on an upper surface of the connector (10) so as to be able to move up and down;
And an elastic body elastically biasing the picking pin 20 so as to protrude from the upper surface of the connector 10,
The connector (10)
A connector base (12);
A base cover 14 having a locking piece 14LP and coupled to the connector base 12;
And an eject body (16) for opening the locking piece (14LP) of the base cover (14)
The switching unit 30 is provided with a locking groove 18LG to which the locking piece 14LP of the base cover 14 is coupled so that the switching unit 30 is connected to the base cover 14 and the connector base 12, And a return pawl 18 for coupling the locking piece 14LP of the base cover 14 to the locking groove 18LG in a state of being inserted together with the locking pawl 18LG,
The picking pin 20 is provided with a support pin portion 20SP having a tip portion 20EP having a sharp tip with its outer diameter gradually decreasing from the proximal end toward the distal end, Characterized in that the tip portion (20EP) is provided on the switch (20).
delete The method according to claim 1,
The connector base (12) has a first switching portion connection hole penetrating from the upper surface to the lower surface, and the base cover (14) is coaxially aligned with the first switching portion connection hole of the connector base And a plurality of locking pieces 14LP arranged in the radial direction around the second switching portion connection holes. The base cover 14 And the locking piece (14LP) is configured to be detached from the locking groove (18LG) formed in the return pawl (18) by opening the plurality of locking pieces (14LP) Wherein the switch comprises a plurality of switches.
The method of claim 3,
The eject body 16 includes a plurality of unlocking block portions 16UB disposed on the upper surface in the radial direction with respect to the central portion of the eject body 16, Locking working side portion 16S1 of the unlocking block portion 16UB in accordance with rotation of the eject body 16 in one direction, The locking piece 14LP is brought into contact with the inner surface of the locking piece 14LP of the cover 14 so as to exert a force to open the second switching portion connection hole center portion of the base cover 14 radially outward In the locking groove (18LG) of the returning pawl (18) inserted into the first switching portion connection hole of the connector base (12) and the second switching portion connection hole of the base cover (14) 14LP) are deviated from each other Multi-functional switch.
5. The method of claim 4,
The locking piece 14LP is provided with a locking protrusion 14HP on its inner circumferential surface so that the ejection body 14HP is engaged with the locking groove 18LG of the return pawl 18, When the locking piece 14LP is extended radially outward from the center of the base cover 14 by the rotation of the locking protrusion 14HP, the locking protrusion 14HP is released from the locking groove 18LG at the same time. Multiple Functional Switches.
5. The method of claim 4,
The eject body 16 has a third switching portion connection hole which is coaxially aligned with the first switching portion connection hole of the connector base 12 and the second switching portion connection hole of the base cover 14 , And the return pawl (18) is simultaneously inserted into the first switching portion connection hole, the second switching portion connection hole and the third switching portion connection hole , The unlocking block portion 16UB on the upper surface of the eject body 16 has another second side portion 16S2 opposite to the unlocking operation side portion 16S1 and the unlocking operation side portion 16S1, And the second side surface portion 16S2 is formed of a straight line surface extending in a direction parallel to a direction of advancing from the inner circumferential surface to the outer circumferential surface of the eject body 16, 14LP) Between the unlocking operation side face portion 16S1 of one unlocking block portion 16UB and the second side face portion 16S2 of the other unlocking block portion 16UB among the adjacent unlocking block portions 16UB adjacent to each other The inner circumferential surface of the locking piece 14LP is disposed at a position where the unlocking operation side surface portion 16S1 contacts and the outer circumferential surface of the locking piece 14LP is disposed at a position facing the second side surface portion 16S2 Wherein the switch comprises a plurality of switches.
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