Movable terminal unit assembly structure, button switch provided with assembly structure, controller provided with button switch, and

Abstract

The invention provides an assembling structure of a movable terminal unit, which can improve assembling performance. In the assembly structure of the movable terminal unit 7, a containing space S is defined by a first wall part 71 and a second wall part 72 which are oppositely arranged at a specified interval, a movable terminal 8 is contained in the containing space S, and a coil spring 9 which applies force to the movable terminal 8 towards the side of the first wall part 71 is contained in the containing space S. A through-hole (72a) through which the coil spring (9) can be inserted is formed in the second wall section (72), a pressing member (10) for compressive deformation of the coil spring (9) is disposed in the through-hole (72a), and the pressing member (10) has an outer peripheral surface (10A) that is in sliding contact with the arcuate inner peripheral surface of the through-hole (72a) in the circumferential direction. The pressing member is held in the through-hole (72a) by means of an engagement protrusion (72b) and an engagement recess (10a) provided on the inner peripheral surface and the outer peripheral surface.

Description

Technical Field

[0001] The present invention relates to an assembly structure of a movable terminal unit, and more particularly to an improvement of a structure for improving assembly performance. Background Art

[0002] Japanese Utility Model Publication No. 54-19969 describes a movable contact support device for supporting a movable contact by means of a spring in an electromagnetic contactor or the like. In the movable contact support device, as shown in the specification of the publication, page 3, line 15 to page 4, line 20 and Figures 4 to 6, a vertical groove (10) is formed in a movable contact support body (1), and a stopper (12) is provided at an opening edge (11) thereof. After the movable contact (4) and the spring (3) are accommodated in the groove (10), a spring pressing piece (15) is inserted into the groove (10) and locked by the stopper (12), and the movable contact support body (1) is clamped by protruding pieces (13) formed by bending both ends of the spring pressing piece (15).

[0003] A contact piece installation device for an electromagnetic contactor is described in Japanese Utility Model Publication No. 52-26171. In the contact piece installation device, as shown in page 2, line 17 to page 3, line 18 and Figures 1 to 2 of the publication, a longitudinal groove (2) and a concave groove (3) are formed on a movable frame (1), and a locking portion (4) is provided on the opening end side of the groove, and a contact piece (5) is inserted into the longitudinal groove (2) and the concave groove (3), and then a coil spring (7) is inserted, and then an elastic pressing piece (8) is pressed into the opening end side of the groove, and a protrusion (9) of the elastic pressing piece (8) is locked to the locking portion (4) of the movable frame (1).

[0004] Japanese Patent No. 3829963 discloses a movable contact device for a multi-pole switch such as a circuit breaker or an electromagnetic contactor. In the movable contact device, as described in paragraph

[0010] ~

[0013] and Figure 1 to Figure 3 As shown, a groove (21b) is formed in the retainer (21), and a locking protrusion (21c) is formed on the front end side of the retainer foot (21a). After the movable contact piece (8) and the contact spring (12) are inserted into the groove (21b), the front end outer side of the retainer foot (21a) covers the retainer support (22), and the locking protrusion (21c) of the retainer foot (21a) is locked in the narrow slit (22b) of the retainer support (22). Prior art literature Patent Literature Patent Document 1: Japanese Utility Model Application Laid-Open No. 54-19969 (see page 3, line 15 to page 4, line 20, and Figures 4 to 6 of the specification) Patent document 2: Japanese Utility Model Application Publication No. 52-26171 (see page 2, line 17 to page 3, line 18, and Figures 1 to 2) Patent Document 3: Japanese Patent No. 3829963 (see paragraphs

[0010] to

[0013] and Figure 1 to Figure 3 ) Summary of the invention In the movable contact support device described in the above-mentioned Japanese Utility Model Publication No. 54-19969, when the spring pressing member (15) is installed in the groove (10) of the movable contact support body (1), the spring (3) is pushed in and inserted into the groove (10) while the spring pressing member (15) is tilted obliquely relative to the groove (10). At the moment when the spring pressing member (15) passes over the stopper (12), the spring pressing member (15) is returned to a horizontal position, whereby the spring pressing member (15) is stopped by the stopper (12) due to the elastic rebound force of the spring (3) (refer to page 4, lines 5 to 20 and Figure 5 of the publication). Thus, in the technology described in the Japanese Utility Model Publication No. 54-19969, when installing the spring pressing member (15), it is necessary to make the spring pressing member (15) tilt obliquely in the groove (10), and in the tilted state, it is necessary to insert it into the groove (10) while overcoming the elastic rebound force of the spring (3), thereby deteriorating the assembly performance. In addition, in order to prevent the spring pressing member (15) from escaping, a stopper (12) is provided at the opening edge (11) of the groove (10) of the movable contact support body (1), and protrusions (13) are provided at both ends of the spring pressing member (15), and the structure becomes slightly complicated. Furthermore, by providing a protrusion (13) on the spring pressing piece (15), when the spring pressing piece (15) is tilted obliquely, it is necessary to position the protrusion (13) so that it is arranged on both sides of the movable contact piece support body (1), thereby reducing the working efficiency and deteriorating the assembly performance. In the contact piece installation device described in the above-mentioned Japanese Utility Model Publication No. 52-26171, when the elastic pressing piece (8) is installed on the groove opening end side of the movable frame (1), it is necessary to position the protrusion (9) of the elastic pressing piece (8) relative to the locking portion (4) of the movable frame (1) (refer to page 3, lines 11 to 18 and Figures 1 to 2 of the publication), thereby reducing the working efficiency and deteriorating the assembly performance. In the movable contact device described in the above-mentioned Japanese Patent Gazette No. 3829963, when the retainer support member (22) is installed on the front end outer side of the retainer leg (21a), it is necessary to position the narrow slit (22b) of the retainer support member (22) relative to the locking protrusion (21c) of the retainer leg (21a) (refer to paragraphs

[0010] to

[0013] and Figure 1 to Figure 3 ), therefore, the working efficiency is reduced and the assemblability is deteriorated. The present invention has been made in view of such a conventional actual situation, and an object of the present invention is to provide an assembly structure of a movable terminal unit capable of improving assembly performance. The assembly structure of the movable terminal unit involved in the present invention defines a housing space by means of a first wall portion and a second wall portion that are arranged opposite to each other at a predetermined interval. The housing space houses a movable terminal and a force-applying component that applies force to the movable terminal toward the first wall portion. A through hole through which the force-applying component can be inserted is formed in the second wall portion, and a pressing component that compresses and deforms the force-applying component is arranged in the through hole. The pressing component has an outer circumferential surface that slides with the arc-shaped inner circumferential surface of the through hole in the circumferential direction, and the pressing component is retained in the through hole by means of a clamping portion provided on the above-mentioned inner circumferential surface and outer circumferential surface. According to the present invention, a movable terminal and a force-applying member for applying force to the movable terminal toward the first wall are accommodated in a receiving space defined by the first wall portion and the second wall portion, and a pressing member is arranged in the through hole of the second wall portion. The outer peripheral surface of the pressing member slides with the arc-shaped inner peripheral surface of the through hole in the circumferential direction, and the pressing member is retained in the through hole by means of a snap-fitting portion between the inner peripheral surface and the outer peripheral surface. Accordingly, when the pressing member is installed in the through hole by means of the snap-fitting portion, it is sufficient to make the outer peripheral surface of the pressing member slide along the arc-shaped inner peripheral surface of the through hole in the circumferential direction, thereby improving assemblability. The assembly structure of the movable terminal unit involved in the present invention has a receiving portion with an opening at one end, in which a movable terminal is received, and a force-applying component for applying force to the movable terminal toward the other end of the receiving portion is received, the opening at one end of the receiving portion is formed to a size that allows the force-applying component to be inserted, and a pressing component for compressing and deforming the force-applying component is arranged at the opening. The pressing component has an outer peripheral surface that is in sliding contact with the arc-shaped inner peripheral surface of the opening in the circumferential direction, and the pressing component is held in the opening by means of a clamping portion provided on the inner peripheral surface and the outer peripheral surface. According to the present invention, a receiving portion with an opening at one end side receives: a movable terminal, and a force-applying component for applying force to the movable terminal toward the other end side of the receiving portion, and a pressing component is arranged at the opening at one end side of the receiving portion. The outer peripheral surface of the pressing component slides with the arc-shaped inner peripheral surface of the opening in the circumferential direction, and the pressing component is held in the opening by means of a clamping portion between the inner peripheral surface and the outer peripheral surface. Accordingly, when the pressing component is installed in the opening by means of the clamping portion, it is sufficient to make the outer peripheral surface of the pressing component slide along the arc-shaped inner peripheral surface of the opening in the circumferential direction, thereby improving the assemblability. In the present invention, the engaging portion is composed of an engaging protrusion and an engaging recess, wherein the engaging protrusion extends circumferentially on either the inner circumferential surface of the through hole / opening or the outer circumferential surface of the pressing component, and the engaging recess extends circumferentially on either the inner circumferential surface of the through hole / opening or the outer circumferential surface of the pressing component and is capable of engaging with the engaging protrusion. In the present invention, the engaging recess has: an insertion port that allows the insertion of the engaging protrusion; a circumferential movement limiting portion that limits the circumferential movement of the engaging protrusion in the engaging recess when engaged with the engaging protrusion; and an axial movement limiting portion that limits the axial movement of the engaging protrusion in the engaging recess. In the present invention, the engagement portion is composed of a plurality of engagement portions arranged at substantially equal intervals along the circumferential direction. Here, the term "substantially" is added to mean that the intervals may not be strictly equal, and a certain degree of error is allowed. In the present invention, the pressing member has the locking portion that is rotated around the central axis by the rotating tool. In the present invention, the urging member is a coil spring, and the pressing member has a shaft portion extending in a space on the inner peripheral side of the coil spring, and the shaft portion limits the amount of movement of the movable terminal. The push button switch according to the present invention has the assembly structure of the movable terminal unit, wherein the movable terminal is arranged to be movable together with the push button, and is arranged to be able to approach and separate from the fixed terminal through the movement of the push button. In the present invention, the push button switch is an emergency stop switch. A controller according to the present invention includes a push button switch. The assembly method of the movable terminal unit involved in the present invention is a method of assembling the movable terminal unit by accommodating the movable terminal unit in a accommodating portion which is open on one end side and a side side, wherein the movable terminal unit comprises: a movable terminal, a force-applying component for applying force to the movable terminal, and a pressing component of the force-applying component, and the method comprises the following steps. i) inserting the movable terminal into the receiving portion from an opening at one end or a side of the receiving portion and arranging the movable terminal at the other end of the receiving portion, ii) inserting the biasing member into the housing portion from an opening at one end of the housing portion and bringing it into contact with the movable terminal, iii) The pressing component is arranged at the opening of one end side of the accommodating portion and abutted against the force-applying component, the force-applying component is pushed to compress and deform it, and the pressing component is circumferentially slid along the arc-shaped inner circumferential surface of the opening at one end side, thereby the pressing component is maintained at the opening at one end side by means of the inner circumferential surface of the opening at one end side and the engaging portion provided on the outer circumferential surface of the pressing component corresponding to the inner circumferential surface. According to the present invention, first, the movable terminal is inserted from the opening of one end side / lateral side of the receiving portion and is arranged at the other end side of the receiving portion, and the force-applying component is inserted from the opening of one end side of the receiving portion and abuts against the movable terminal. Next, the pressing component is arranged at the opening of one end side of the receiving portion and abuts against the force-applying component, and the force-applying component is pushed to compress and deform, and the pressing component slides along the arc-shaped inner circumferential surface of the opening at one end side in the circumferential direction, thereby, the pressing component is maintained at the opening at one end side by means of the inner circumferential surface of the opening at one end side and the engaging portion of the outer circumferential surface of the pressing component. In this way, when the pressing component is installed at the opening at one end side, it is sufficient to slide the pressing component along the arc-shaped inner circumferential surface of the opening at one end side in the circumferential direction, thereby improving the assemblability. Effects of the Invention As described above, according to the present invention, when the pressing member is mounted in the through hole / opening, the pressing member only needs to be slidably contacted along the arc-shaped inner peripheral surface of the through hole / opening in the circumferential direction, thereby improving assemblability. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 This is an overall perspective view of an emergency stop switch (push button switch) to which an assembly structure of a movable terminal unit according to an embodiment of the present invention is applied. Figure 2 It indicates that the emergency stop switch ( Figure 1 ) is a front view of the internal structure after removing components such as the button, retaining shell and locking nut, and shows the movable terminal, unit shaft and fixed terminal together. Figure 3 yes Figure 2 It is a partial enlarged view of the movable terminal unit. Figure 4 The movable terminal unit ( Figure 3 ) in a stereogram. Figure 5 It indicates that the movable terminal unit ( Figure 3 ) bottom view. Figure 6 It means that the movable terminal unit ( Figure 3) is a front view of the state after being turned upside down. Figure 7 It indicates that the movable terminal unit ( Figure 6 ) is a front view of the housing. Figure 8 The housing is viewed from above. Figure 7 ) in a stereogram. Fig. 9 The housing ( Figure 8 ) above view. Fig.10 It means that the movable terminal, the force applying member and the pressing member are removed from the movable terminal unit ( Figure 6 )Disassembled stereogram. Fig.11 The pressing member ( Fig.10 )’s main view. Fig.12 yes Fig.11 Bottom view of . Fig.13 The movable terminal unit ( Figure 6 ) is a diagram used to sequentially illustrate the assembly steps of the movable terminal unit. Fig.14 It is used to sequentially explain the movable terminal unit ( Figure 6 ) of the assembly steps. Fig.15 It is used to sequentially explain the movable terminal unit ( Figure 6 ) of the assembly steps. Fig.16 It is used to sequentially explain the movable terminal unit ( Figure 6 ) of the assembly steps. Fig.17 It is used to sequentially explain the movable terminal unit ( Figure 6 ) of the assembly steps. Fig.18 It is used to sequentially explain the movable terminal unit ( Figure 6 ) of the assembly steps. Fig.19 It is used to sequentially explain the movable terminal unit ( Figure 6 ) of the assembly steps. DETAILED DESCRIPTION Hereinafter, embodiments of the present invention will be described based on the drawings. Figures 1 to 19 1 is a diagram for explaining a push button switch to which an assembly structure of a movable terminal unit according to an embodiment of the present invention is applied, Figure 1 shows what a push button switch looks like, Figures 2 to 19 The internal structure of the push button switch is shown. Figures 2 to 6shows the movable terminal unit, Figures 7 to 9 The figure shows a housing for accommodating the movable terminal. Figures 10 to 12 shows the movable terminal unit, Figures 13 to 19 The assembly steps of the movable terminal unit are sequentially shown. In addition, here, an emergency stop switch is taken as an example as a push button switch. like Figure 1 As shown, the emergency stop switch 1 comprises: a button 2, a retaining shell 3 that retains the button 2 so as to be movable along the axial direction (the up and down direction in the figure), a locking nut 4 that is threadedly engaged with an external threaded portion formed at an end 30 of the retaining shell 3, a plurality of fixed terminals 5 that extend from the lower surface of the end 30 of the retaining shell 3 toward the bottom of the figure, and a plurality of movable terminals (described later) that respectively correspond to each of the fixed terminals 5. Button 2 is set so that the operator can manually push it in the direction of pushing ( Figure 1 The lock nut 4 is used to mount the emergency stop switch 1 on a panel of a machine or a control machine, etc. Figure 2 It means: in Figure 1 The emergency stop switch 1 is shown in the state after the button 2, the retaining housing 3 and the locking nut 4 are removed. Figure 2 As shown, the emergency stop switch 1 has a shaft portion 6 extending in the axial direction (the vertical direction in the figure). The shaft portion 6 is arranged to: Figure 1 ) operation (push operation or restore operation) and can move along the axial direction together with the button 2. The movable terminal unit 7 is arranged below the shaft portion 6 in the figure. The movable terminal unit 7 has a housing 70. The upper end 70a ( Figure 3 ) is engaged with the shaft portion 6, and the movable terminal unit 7 can move along the axial direction together with the movement of the shaft portion 6. like Figure 3 , Figure 6 as well as Figure 7 ( Figure 6 , Figure 7 is with Figure 3 As shown in the figure (inverted upside down), the housing 70 has a first wall portion 71 and a second wall portion 72 arranged opposite to each other in the up-down direction at a predetermined interval, and the walls 71 and 72 form a pair of left and right receiving spaces (receiving portions) S extending in the up-down direction. Each receiving space S contains a movable terminal 8 and a coil spring (urging member) 9 for urging the movable terminal 8 toward the first wall portion 71. Figure 8As shown, a circular through hole (opening) 72a is formed in the second wall portion 72, which penetrates the second wall portion 72 in the vertical direction. The through hole 72a has a size that allows the coil spring 9 to be inserted. The arc-shaped inner peripheral surface of the through hole 72a is provided with an engaging protrusion 72b extending in an arc shape along the inner peripheral surface in the circumferential direction. Fig. 9 As shown, the engaging protrusion 72b is composed of a pair of engaging protrusions, and the pair of engaging protrusions are arranged at opposing positions (that is, positions separated by about 180 degrees on the circumference) on the arc-shaped inner peripheral surface of the through hole 72a. The through hole 72a of the second wall portion 72 is provided with a pressing member 10 (see FIG. 1 ) for holding (ie, pressing and holding) the coil spring 9 accommodated in the accommodation space S in a compressed and deformed state. Figures 3 to 6 ).like Figures 10 to 12 As shown, the pressing member 10 has: a substantially cylindrical large diameter portion 10A arranged at one end side and mounted in the through hole 72a, and a cylindrical shaft portion 10B arranged at the other end side and having a smaller diameter than the large diameter portion 10A. The shaft portion 10B is used to hold the front end side portion (the end portion on the pressing member 10 side) of the coil spring 9 in the movable terminal unit 7, and extends in the inner peripheral side space of the coil spring 9. The arc-shaped outer peripheral surface of the large diameter portion 10A has a size that can slide in contact (i.e., can slidably contact, i.e., slide contact) with the arc-shaped inner peripheral surface of the through hole 72a in the circumferential direction. An engaging recess 10a is formed on the arc-shaped outer peripheral surface of the large diameter portion 10A. The engaging recess 10a extends in an arc shape along the outer peripheral surface in the circumferential direction and can engage with the engaging protrusion 72b on the inner peripheral surface of the through hole 72a. Fig.11 as well as Fig.12 As shown, the engaging recess 10a is composed of a pair of engaging recesses, which are arranged at opposite positions (that is, positions separated by about 180 degrees on the circumference) on the arc-shaped outer peripheral surface of the large diameter portion 10A. The corresponding engaging protrusions 72b of the through hole 72a of the second wall portion 72 are engaged with the engaging recesses 10a of the large diameter portion 10A of the pressing member 10, so that the pressing member 10 is held in the through hole 72a. The lower end of the large diameter portion 10A is formed with an insertion port 10b extending in the axial direction and communicating with the engaging recess 10a, and the insertion port 10b allows the engaging protrusion 72b on the inner peripheral surface of the through hole 72a to be inserted. The insertion port 10b and the engaging recess 10a form a recess in the large diameter portion 10A that is in the shape of an inverted L when viewed from the front. Fig.11 The left end of the middle part is provided with a protrusion 11 protruding into the engagement recess 10a. The protrusion 11 is a substantially trapezoidal or triangular part, which has: Fig.11 The invention also includes a vertical wall portion 11a extending in the middle and upper direction, and an inclined wall portion 11b extending in a direction obliquely intersecting the axial direction. The circumferential length 10L of the engagement recess 10a is defined by the vertical wall portion 11a. The vertical wall portion 11a functions as a circumferential movement limiting portion when the engagement recess 10a is in a state of being engaged with the engagement protrusion 72b of the through hole 72a. The circumferential movement limiting portion limits the circumferential movement of the engagement protrusion 72b in the engagement recess 10a. Fig.11 The upper middle end portion (middle end portion) 10a1 and the lower side wall portion (lower end portion in the figure) 10a2 act as axial movement limiting portions when engaged with the engaging protrusion 72b in the engaging recess 10a, wherein the axial movement limiting portion limits the axial movement (upper and lower directions in the figure) of the engaging protrusion 72b in the engaging recess 10a. like Fig.10 As shown, a protrusion (stopping portion) 10c is provided on the top surface of the large diameter portion 10A of the pressing component 10 and in the central portion. The protrusion 10c has, for example, a rectangular parallelepiped shape. The protrusion 10c is used to rotate the pressing component 10 around the central axis in the through hole 72a by, for example, stopping with the front end of a special tool (rotation tool) when the pressing component 10 is installed in the through hole 72a. In addition, when the pressing component 10 is formed, the flow channel portion equivalent to the special tool can be integrally formed with the pressing component 10, and the flow channel portion can be operated as a handle, so that after the pressing component 10 is installed in the through hole 72a, the flow channel portion is cut off at a position near the top surface of the large diameter portion 10A. In this case, as long as the cross-sectional area of ​​the flow channel portion is minimized at the cutting position, the flow channel portion can be easily cut off. A notch 10d is formed on the outer peripheral edge of the top surface of the large diameter portion 10A of the pressing member 10. In this example, the notch 10d is composed of two notches substantially arranged at equal intervals on the circumference. The notch 10d is used to lock the front end of the tool and rotate the pressing member 10 in the through hole 72a when the pressing member 10 is removed from the through hole 72a after assembling the movable terminal unit 7. As shown in the exploded assembly diagram of the movable terminal unit 7 Fig.13 As shown in FIG. 1 , the movable terminal 8 is a component extending in a substantially rectangular shape along the length direction, and has movable contacts 8a at both ends. A protrusion 8c is provided at the center of the length direction of the movable terminal 8. The protrusion 8c is used to: Fig.10 ) The lower end of the coil spring 9 shown in the figure is held from the inner circumference side of the coil spring 9. At this time, as Fig.10As shown, the upper end of the coil spring 9 is held from the inner peripheral side of the coil spring 9 by the shaft 10B of the pressing member 10. The axial gap defined by the protrusion 8c and the shaft 10B is the maximum movement amount (the maximum movable stroke, or in other words, the maximum possible compression deformation amount of the coil spring 9) of the movable terminal 8, and the shaft 10B of the pressing member 10 limits the movement amount of the movable terminal 8. The practical movement amount of the movable terminal 8 is set to a value smaller than the maximum movement amount. like Fig.10 As shown, the movable terminal 8 has a narrow width portion 82 at the substantially central portion in the longitudinal direction, the width of which is narrower than the wide width portions 81 at both ends in the longitudinal direction. Figure 7 As shown, the accommodating space S of the movable terminal 8 is open on the side (the front side and the back side of the paper), and is composed of a wide width portion S1 with a wider opening width arranged on the side of the second wall portion 72, and a narrow width portion S2 with a smaller opening width arranged on the side of the first wall portion 71. The wide width portion S1 is formed so that the wide width portion 81 of the movable terminal 8 can be opened from the side (for example Figure 7 The narrow width portion S2 is formed to allow the narrow width portion 82 of the movable terminal 8 to be inserted in the vertical direction ( Figure 7 The wide width portion S1 and the narrow width portion S2 are connected by an inclined surface. like Figure 3 As shown, the fixed terminal 5 is composed of a pair of left and right conductive members bent into a substantially L-shape, and is fixed to the holding housing 3 ( Figure 1 ). Fixed contacts 5a are respectively mounted on the front ends of the fixed terminals 5. Each fixed contact 5a is arranged at a position facing the corresponding movable contact 8a in the up-down direction. When the push button 2 is not pushed, the movable contacts 8a are elastically contacted with the corresponding fixed contacts 5a by the elastic rebound force of the coil spring 9 (see Figure 3 ), a predetermined contact pressure is applied to each fixed contact 5a. On the other hand, when the button 2 is pushed, the movable contact unit 7 moves together with the shaft 6 in the push direction of the button 2 ( Figure 3 The movable terminal 8 also moves in the same direction, and as a result, the movable contact 8a separates from the fixed contact 5a. In addition, during the restoration operation after the push-in operation of the button 2, when the button 2 is moved in the pulling direction ( Figure 3 When the movable contact unit 7 moves in the same direction as the shaft portion 6, the movable terminal 8 also moves in the same direction, and as a result, the movable contact 8a approaches and abuts against the fixed contact 5. In this way, the movable terminal 8 is configured to be able to approach and leave the fixed terminal 5, and the movable contact 8a can approach or leave the fixed contact 5a. Next, refer to Figures 13 to 19 , the assembly steps of the movable terminal unit 7 are described. When assembling the movable terminal unit 7, Fig.13 As shown, first, the housing 70 is mounted on a base surface of an automatic assembly machine (not shown). At this time, the housing 70 is arranged in a state where the through hole 72a faces upward. Next, if Fig.14 As shown, the movable terminal 8 is inserted into the wide portion S1 from the side of the accommodation space S, and the narrow portion 82 ( Fig.13 ) is arranged at the position of the wide width portion S1. In this state, Fig.15 As shown, the movable terminal 8 is moved downward (i.e., toward the first wall portion 71) and brought into contact with the first wall portion 71. At this time, the narrow width portion 82 in the center of the movable terminal 8 is clamped from left and right by the narrow width portion S2 of the receiving space S, and the wide width portions 81 at both ends of the movable terminal 8 are arranged on both sides of the narrow width portion S2 of the receiving space S (see Figure 5 ). Next, if Fig.16 As shown, the coil spring 9 is inserted into the receiving portion S from the through hole 72a so as to abut against the movable terminal 8. At this time, the lower end of the coil spring 9 is held by the protrusion 8c ( Fig.13 ) from the inner side (refer to Figure 3 , Fig.10 ). Next, if Fig.17 As shown, the pressing member 10 is inserted into the through hole 72a. This figure shows: the engaging protrusion 72b ( Figure 8 ) from the insertion opening 10b of the large diameter portion 10A of the pressing member 10 ( Fig.10 During the insertion, the large diameter portion 10A of the pressing member 10 abuts against the coil spring 9 in the receiving portion S and pushes the coil spring 9 to compress and deform it, so that the upper end of the coil spring 9 is held from the inner peripheral side by the shaft portion 10B of the pressing member 10 (see Figure 3 , Fig.10 ). In this state, if Fig.18 As shown, the pressing member 10 is rotated clockwise in the figure. At this time, the outer peripheral surface of the large diameter portion 10A of the pressing member 10 slides (i.e., slides) along the inner peripheral surface of the through hole 72a in the circumferential direction, and the engaging protrusion 72b ( Figure 8 ) passes over the protruding portion 11 of the large diameter portion 10A of the pressing member 10 ( Fig.11) and engage with the engaging recess 10a. When the engaging protrusion 72b passes over the protrusion 11 of the pressing member 10, the inclined wall 11b of the protrusion 11 allows the engaging protrusion 72b to move smoothly toward the engaging recess 10a. Fig.17 as well as Fig.18 By comparison, it can be seen that the rotation of the pressing member 10 is manifested in that the position of the cutout portion 10 d of the large diameter portion 10A of the pressing member 10 changes. Next, once the pushing force acting on the pressing member 10 is removed, the pressing member 10 is pushed toward the outside of the through hole 72a ( Fig.18 The pressing member 10 is slightly moved to the upper middle side, thereby being held in the through hole 72a. Fig.19 As shown, the top surface of the pressing member 10 slightly protrudes from the upper surface of the second wall portion 72. In this way, the assembly of the movable terminal unit 7 is completed. exist Fig.19 In the state shown, the engagement protrusion 72b of the through hole 72a is pressed against the lower side wall portion 10a2 ( Fig.11 Therefore, in this state, if the pressing member 10 is to be rotated only to the left (counterclockwise), the engaging protrusion 72b will engage with the protrusion 11 ( Fig.11 ) interferes with the vertical wall portion 11a, thereby preventing the pressing member 10 from rotating in the detaching direction. Fig.19 In the state shown, in order to remove the pressing member 10, it is sufficient to proceed as follows: while overcoming the elastic rebound force of the coil spring 9, a pushing force is applied to the pressing member 10, and the engaging protrusion 72b is moved toward the upper side wall portion 10a1 ( Fig.11 ) side, and in this state, the pressing member 10 is rotated to the left (counterclockwise) and moved to the position of the insertion port 10b, after which the pushing force on the pressing member 10 is released. In this way, in this embodiment, the movable terminal 8 and the coil spring 9 are accommodated in the accommodating space S defined by the first wall portion 71 and the second wall portion 72, and the pressing component 10 is arranged in the through hole 72a of the second wall portion 72, and the outer peripheral surface of the large diameter portion 10A of the pressing component 10 is circumferentially slidable with the arc-shaped inner peripheral surface of the through hole 72a, and the engaging protrusion 72b provided on the arc-shaped inner peripheral surface of the through hole 72a is engaged with the engaging recess 10a formed on the outer peripheral surface of the large diameter portion 10A of the pressing component 10, thereby holding the pressing component 10 in the through hole 72a. Therefore, when the pressing component 10 is installed in the through hole 72a with the help of the engaging protrusion 72b and the engaging recess 10a, it is sufficient to make the outer peripheral surface of the pressing component 10 slide along the arc-shaped inner peripheral surface of the through hole 72a in the circumferential direction, thereby improving the assemblability. In the above-mentioned assembly step of the movable terminal unit 7, when the pressing member 10 is inserted into the through hole 72a (refer to Fig.16 , Fig.17 ), it is not necessary to align the insertion port 10b of the pressing member 10 with the engaging protrusion 72 of the through hole 72a. Even when the insertion port 10b of the pressing member 10 is not aligned with the engaging protrusion 72b of the through hole 72a, when inserting the pressing member 10 into the through hole 72a, as long as the pressing member 10 is pushed into the through hole 72a and rotated clockwise (or counterclockwise) to rotate slowly, the pressing member 10 can be inserted into the through hole 72a by passing the engaging protrusion 72b of the through hole 72a through the insertion port 10b of the pressing member 10 when the insertion port 10b of the pressing member 10 is aligned with the engaging protrusion 72b of the through hole 72a during the rotation of the pressing member 10, and inserting the pressing member 10 into the through hole 72a. Furthermore, after the pressing member 10 is inserted into the through hole 72 a , the pressing member 10 is rotated clockwise while a pressing force is applied to the pressing member 10 , whereby the engaging protrusion 72 of the through hole 72 a engages with the engaging recess 10 a of the pressing member 10 . Therefore, according to the present embodiment, in order to attach the pressing member 10 to the through hole 72a, it is sufficient to push the pressing member 10 into the through hole 72a and rotate it clockwise, without requiring complicated positioning of the engaging parts. [First variant] In the embodiment, although it is illustrated that the engaging protrusion 72b is formed on the inner peripheral surface of the through hole 72a formed in the second wall portion 72 of the housing 70, and the engaging recess 10a engaged with the engaging protrusion 72b is formed on the outer peripheral surface of the large diameter portion 10A of the pressing member 10, the application of the present invention is not limited to this. Contrary to the above-described embodiment, an engaging protrusion may be formed on the outer peripheral surface of the large diameter portion 10A of the pressing member 10, and an engaging recess that can engage with the engaging protrusion may be formed on the inner peripheral surface of the through hole 72a of the second wall portion 72. In this case, an insertion port that extends in the axial direction in a manner that allows insertion of the engaging protrusion of the pressing member 10 and communicates with the engaging recess is formed in the through hole 72a. [Second variant] In the embodiment, although it is illustrated that the engaging protrusion 72b of the through hole 72a is arranged at two relative positions on the inner peripheral surface, and the engaging recess 10a of the pressing component 10 is formed at two relative positions on the outer peripheral surface, the above-mentioned engaging protrusion 72b and the engaging recess 10a may be arranged at three or more positions substantially at equal intervals along the circumferential direction. [Third Modification] In the embodiment, although it is illustrated that: an arc-shaped engaging protrusion 72b is formed on the inner circumferential surface of the through hole 72a, and an engaging recess 10a capable of engaging with the engaging protrusion 72b is formed on the outer circumferential surface of the large diameter portion 10A of the pressing component 10, thereby preventing the engaging protrusion 72b from falling off in the circumferential and axial directions relative to the engaging recess 10a, the application of the present invention is not limited to this. An internal thread portion extending in a spiral shape may be formed on the inner circumferential surface of the through hole 72a, and an external thread portion threadedly engaged with the internal thread portion may be formed on the outer circumferential surface of the large diameter portion 10A of the pressing component 10, and the large diameter portion 10A of the pressing component 10 may be fastened to the through hole 72a by the above-mentioned thread portion, and then the pressing component 10 may be fixed to the through hole 72a using an adhesive such as a thread lock. [Fourth Modification] In the above embodiment, although the storage space S is defined by the first wall 71 and the second wall 72, the application of the present invention is not limited thereto. The second wall 72 may be omitted and the storage space S may be a space with an upper opening (i.e., an opening at one end). Although not shown, an arc-shaped inner peripheral surface is formed at the opening on one end side (refer to the groove (3) in the first figure of Japanese Utility Model Publication No. 52-26171), and a pair of engaging protrusions 72b are provided on the inner peripheral surface, which is the same as the embodiment, and the outer peripheral surface of the large diameter portion 10A of the pressing member 10 is slidably contacted with the arc-shaped inner peripheral surface of the opening on one end side in the circumferential direction, and the pressing member 10 is held in the opening by the engaging protrusion 72b engaging with the engaging recess 10a of the large diameter portion 10A. In addition, in this case, the insertion of the movable terminal 8 into the accommodating space S is performed, for example, from the opening on one end side. Even in this case, when installing the pressing component 10 in the opening on one end side, it is sufficient to push the pressing component 10 into the opening on one end side and slide it circumferentially along the arc-shaped inner surface of the opening. Therefore, there is no need for complicated positioning of the locking parts, thereby improving the assembly performance. [Fifth Modification] In the above-described embodiment, although it is illustrated that the protrusion (stopping portion) 10c is provided at the central portion of the top surface of the large diameter portion 10A of the pressing member 10, the application of the present invention is not limited to this. Instead of the protrusion 10c, a stopper recess (stopper) (not shown) may be provided at the central portion of the top surface. In this case, by making the stopper recess into, for example, a cross hole shape or a hexagonal hole shape, when the pressing member 10 is mounted in the through hole 72a, a general tool such as a cross screwdriver or a hexagonal wrench having a front end shape corresponding to the above-mentioned stopper recess may be used. [Other variations] All points about the above-mentioned embodiments and various variations should be regarded as merely illustrative of the present invention and are not restrictive. Even if not clearly stated in this specification, a person skilled in the art of the present invention can, taking into account the above-mentioned teachings, construct various variations or other embodiments using the principles of the present invention without departing from the purpose and essential features of the present invention. [Application examples and other application examples] Although an emergency stop switch is used as an example of a preferred application of the assembly structure of the movable terminal unit involved in the present invention, the application of the present invention is not limited to the emergency stop switch, and the present invention can also be applied to other push button switches besides the emergency stop switch. In addition, the emergency stop switch to which the present invention is applied is provided in, for example, various controllers such as machinery and equipment used in factories or their control equipment, and teaching devices connected to the control equipment, so that the machinery and equipment are stopped urgently when the emergency stop switch is operated. Possibility of Industrial Application The present invention is useful in an assembly structure of a movable terminal unit, and is particularly suitable for a structure for improving assembly performance. Description of Reference Numerals 1: Emergency stop switch (push button switch), 2: Push button, 5: Fixed terminal, 7: Movable terminal unit, 71: First wall portion, 72: Second wall portion, 72a: Through hole, 72b: Engaging convex portion (engaging portion), 8: Movable terminal, 9: Coil spring (biasing member), 10: Pressing member, 10a: Engaging concave portion (engaging portion), 10a1: Upper side wall portion (axial movement limiting portion), 10a2: Lower side wall portion (axial movement limiting portion), 10b: Insertion port, 10c: Protrusion (stopping portion), 10B: Shaft portion, 11: Protrusion (circumferential movement limiting portion), S: Accommodating space (accommodating portion).

Claims

1. An assembly structure of a movable terminal unit, characterized in that: The storage space is defined by the first wall portion and the second wall portion which are arranged opposite to each other with a predetermined interval therebetween. The accommodating space accommodates a movable terminal and accommodates a biasing member for biasing the movable terminal toward the first wall portion. The second wall portion has a through hole through which the urging member can be inserted, and a pressing member for compressing and deforming the urging member is arranged in the through hole. The pressing member has an outer peripheral surface that is in sliding contact with the arc-shaped inner peripheral surface of the through hole in the circumferential direction, and the pressing member is held in the through hole by means of engaging portions provided on the inner peripheral surface and the outer peripheral surface.

2. An assembly structure of a movable terminal unit, characterized in that: The assembly structure of the movable terminal unit has a receiving portion with an opening at one end. The housing portion houses a movable terminal and houses a biasing member for biasing the movable terminal toward the other end of the housing portion. The opening at the one end of the housing portion is formed to be large enough to allow the force applying member to pass through. A pressing member for compressing and deforming the force applying member is arranged at the opening, The pressing member has an outer peripheral surface that is in sliding contact with the arc-shaped inner peripheral surface of the opening in the circumferential direction, and the pressing member is held in the opening by means of an engaging portion provided on the inner peripheral surface and the outer peripheral surface.

3. The assembly structure of the movable terminal unit according to claim 1 or 2, characterized in that: The engaging portion is composed of an engaging protrusion and an engaging recess, wherein the engaging protrusion extends in the circumferential direction of either the inner circumferential surface or the outer circumferential surface of the pressing component, and the engaging recess extends in the circumferential direction of either the inner circumferential surface or the outer circumferential surface of the pressing component and can be engaged with the engaging protrusion.

4. The assembly structure of the movable terminal unit according to claim 3, characterized in that: The engaging recess has an insertion port that allows the engaging protrusion to be inserted; and a circumferential movement limiting portion that limits the circumferential movement of the engaging protrusion in the engaging recess when the engaging protrusion is engaged with the engaging protrusion. and an axial movement restricting portion for restricting the axial movement of the engagement protrusion within the engagement recess.

5. The assembly structure of the movable terminal unit according to claim 1 or 2, characterized in that: The engaging portion is composed of a plurality of engaging portions arranged at substantially equal intervals along the circumferential direction.

6. The assembly structure of the movable terminal unit according to claim 1 or 2, characterized in that: The pressing member has a locking portion for being rotated around a central axis by a rotating tool.

7. The assembly structure of the movable terminal unit according to claim 1 or 2, characterized in that: The urging member is a coil spring, and the pressing member has a shaft portion extending in a space on the inner peripheral side of the coil spring, and the shaft portion limits the movement amount of the movable terminal.

8. A push button switch having an assembly structure of the movable terminal unit according to claim 1 or 2, characterized in that: The movable terminal is configured to be movable together with the button, and is configured such that the movable terminal can approach and move away from the fixed terminal through the movement of the button.

9. The push button switch according to claim 8, characterized in that: This push button switch is an emergency stop switch.

10. A controller comprising the push button switch according to claim 8.

11. A method for assembling a movable terminal unit, comprising accommodating the movable terminal unit in an accommodating portion having openings at one end and a side thereof, wherein: The movable terminal unit comprises: a movable terminal, a force applying member for applying force to the movable terminal, and a pressing member of the force applying member, and the method comprises the following steps: The movable terminal is inserted into the housing portion from an opening at one end or a side of the housing portion and arranged at the other end of the housing portion. The urging member is inserted into the housing portion from the opening on the one end side of the housing portion and abuts against the movable terminal. The pressing component is arranged at the opening on the one end side of the accommodating portion and abutted against the force-applying component, the force-applying component is pushed to compress and deform it, and the pressing component is circumferentially slid along the arc-shaped inner circumferential surface of the opening on the one end side, thereby maintaining the pressing component at the opening on the one end side with the aid of a locking portion provided on the inner circumferential surface of the opening and the outer circumferential surface of the pressing component corresponding to the inner circumferential surface.

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