JP2009014007A - Option mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide mounting structure surely mounting an option to a rail groove even with a small operating force. <P>SOLUTION: The mounting structure mounts a mounting device 8 with respect to the rail groove 23. The mounting device 8 comprises: a bracket 81; an operating body 82 disposed to the bracket 81 and receiving the operating force; a pressing part 84 disposed to the bracket 81 and pressing a bottom face 20B and a downward face 234 respectively, and an engagement claw part 83; a fastening mechanism Z1 for making a fastening state Z1 where the rail groove 23 is fastened, by pressing a pressing face 842a and an engagement face 832a against the bottom face 20B and the downward face 234 with the operating force applied to the operating body 82; and a positioning operating body 82b as a width positioning mechanism positioning the bracket 81 to a predetermined position in a width direction of the rail groove 23 in the fastening state Z1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an option mounting structure for mounting an option member to a rail groove.

  2. Description of the Related Art Conventionally, in an office, various option mounting apparatuses and optional mounting structures for mounting optional members such as a desktop panel and a task light have been proposed in an opening including a rail groove provided in a base on which a top plate or the like is mounted.

  In such an embodiment, while suitably supporting the load of the option member itself, the position can be changed by appropriately sliding an option mounting device or a bracket along the rail groove, and the bracket or the like can be changed to the rail groove. The option member can be positioned at a desired position along the rail groove by switching between the fixing mode and the fixing mode (see, for example, Patent Document 1). Also, the applicant of the present application has filed an application for the mounting structure of the optional member in the above-described manner. (See Japanese Patent Application No. 2006-308657).

In the above-described configuration, in order to move the option member suitably along the rail groove, a gap with a certain dimension is provided between the inner wall of the rail groove and the bracket or the like.
JP 2005-102737 A

  However, when fixing a bracket or the like to the rail groove, if the bracket is fixed at the most suitable position in the width direction in the rail groove, it can be attached with a small working force. When fixing in the groove so that it cannot move, the position in the width direction of the optional member differs by the size of the gap, so the bracket is at the most suitable position to obtain sufficient mounting strength regardless of the position in the width direction. An operation force larger than an operation force required for fixing is required.

  That is, the conventional one always requires a large operating force in order to obtain a required mounting strength regardless of the position in the width direction, and the bracket itself is large in order to generate a large operating force. Invite them to use, and require excessive operating force from the user.

  The present invention pays attention to such a problem, and provides an attachment structure capable of reliably attaching an option to a rail groove even with a small operating force.

  In order to achieve such an object, the present invention takes the following measures. That is, the option mounting structure according to the present invention is an option in which an inner surface that stands up against each other from the bottom surface, a rail groove having an opening end surface continuous with the upper end of the inner surface, and an insertion end portion that can be inserted into and removed from the rail groove. A main body for mounting, an operating body provided in the main body for receiving an operating force, a first pressure receiving surface provided in the main body and provided in the rail groove, and a first pressure receiving surface capable of pressing the second pressure receiving surface. The engaging body having the pressing surface and the second pressing surface, and the first pressing surface and the second pressing surface by the operating force applied to the operating body, the first pressure receiving surface and the second pressure receiving surface. A tightening mechanism that presses against a surface to tighten the rail groove, and a width positioning mechanism that positions the main body at a predetermined position in the width direction of the rail groove in the tightened state. Specially To.

  Here, the object to be attached to the rail groove is described by the term “option”, but in this specification, the whole object that can be attached to the rail groove is expressed as an option. In other words, the object to be attached to the rail groove is not limited to “additional addition” as the word “option”, but also has an aspect of attaching “required essential” to the rail groove. Shall be included.

  In this case, the main body is always positioned at a predetermined position in the tightening state by the width positioning mechanism. For this reason, the operating force required to achieve the tightening state is always the operating force required at such a predetermined position. By doing so, it is possible to effectively avoid a configuration in which a larger operating force is output assuming that the positioning is performed at a position other than the predetermined position, and the tightening state can be achieved with the minimum necessary operating force. be able to. Furthermore, various modes can be adopted as the mode of positioning in the width direction. For example, a simple mode in which a component is separately inserted between the rail groove and the main body can be realized. In addition, each component for attaching the option can be set to a minimum size capable of realizing the strength for obtaining such an operation force, which can contribute to the compactness of each component.

As a configuration capable of realizing a necessary and sufficient mounting strength with a smaller operating force, a configuration in which the width positioning mechanism positions the main body at a central position between the inner surfaces of the rail grooves can be exemplified.
Then, as a specific configuration capable of suitably positioning the main body, it is desirable that the width positioning mechanism has a fitting portion that fits between the main body and the inner surface of the rail groove.

  And in order to position a main body suitably in a desired position, it is preferable that the indented part shall be located in the both sides of the main body.

  In order to enable simultaneous positioning by the width positioning mechanism and tightening by the tightening mechanism by simultaneous positioning in the width direction of the main body by simultaneously using the operating force to bring the tightening mechanism into the tightening state. It is desirable that the operating body is a single operating body and the indented portion is provided integrally with the operating body.

  And in order to position a main body suitably with a small operation force, it has a guide surface which guides a main body to a predetermined position with operation of an operating body, and a positioning surface which positions a main body to a predetermined position in order to perform positioning of an operating body. It is desirable to make it.

  According to the present invention, since the main body is always positioned at a predetermined position in the tightened state, the operating force required to achieve the tightened state is always the operation force required at the predetermined position. By doing so, it is possible to effectively avoid a configuration in which a larger operating force is output assuming that the positioning is performed at a position other than the predetermined position, and the tightening state can be achieved with the minimum necessary operating force. . In addition, each component for attaching the option can have a minimum size that can realize the strength for obtaining such an operation force, and can contribute to the compactness of each component.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The optional desktop panel OP mounting structure A according to the present embodiment is applied to an office configuration system formed by connecting two desks 1 shown in FIG. 1, for example.

  The desk 1 in the office configuration system includes a base 2 extending in the horizontal direction, a base support 3 that supports the base 2, a support 4 that is slidably supported along the base 2, and one end on the support 4. And the leg 6 that supports the other end of the top plate 5 and contacts the floor. In this embodiment, as described above, the desktop panel OP, which is an optional member, is attached to the rail groove 23 formed on the upper side of the base 2 via the option attachment device 8 described in detail later.

  As shown in FIG. 1, the base support 3 supports both ends of the base 2. The base support 3 has, for example, a prism shape or a square pipe shape having a depth dimension substantially the same as the short dimension of the base 2, and a plurality of desks 1 are arranged so that each base 2 is continuous along the longitudinal direction. It is something that was connected to.

  As shown in FIGS. 1 and 2, the base 2 has a substantially quadrangular prism shape extending substantially linearly. A top plate guide portion that guides the movement of the support 4 is provided on a pair of standing surface portions of the base 2 that are opposed to each other along the longitudinal direction.

  The upper surface 2B of the base 2 is provided with a rail groove 23 for moving and guiding the desktop panel OP as an optional member. Specifically, a plurality of (four in the illustrated example) rail grooves 23 are formed on the upper surface portion 2B and extend in parallel with each other at a predetermined pitch in the short dimension direction of the base 2. The relative position of the desktop panel OP with respect to the base 2 can be changed by sliding the desktop panel OP along the rail groove 23.

  As the desktop panel OP, in addition to the one-side support type desktop panel OP as shown in the figure, there can be mentioned a mode in which both sides are supported by an attachment device. In addition to these, various existing members such as task lights can be adopted as optional members. Each rail groove 23 is formed from one end of the base 2 to the other end. Further, end caps are detachably attached to both ends of the base 2 (see FIG. 1, and the base 2 with the end cap removed is shown in the drawings other than FIG. 1).

  Here, an optional mounting structure (hereinafter referred to as a mounting structure) A according to the present embodiment is a rail having an inner side surface 231 that stands up against each other from the bottom surface 20B and an open end surface 233 that is continuous with the upper end of the inner side surface 231. An optional attachment device (hereinafter referred to as an attachment device) 8 to be described in detail later is attached to the groove 23. As will be described later, the mounting device 8 includes a bracket 81 as an optional mounting body that can insert and remove the insertion end 81a into and from the rail groove 23, an operating body 82 that is provided on the bracket 81 and receives an operating force, and a bracket 81. The pressing surface 842a as the first pressing surface and the second pressing surface that can press the bottom surface 20B as the first pressure receiving surface and the downward surface 234 as the second pressure receiving surface provided in the rail groove 23, respectively. The engaging surface having the engaging surface 832a, that is, the pressing portion 84 and the engaging claw portion 83, and the pressing surface 842a and the engaging surface 832a to the bottom surface 20B and the downward surface 234 by the operating force applied to the operating body 82. The tightening mechanism Z that is pressed against the rail groove 23 to tighten the rail groove 23 and the bracket 81 is fixed in the width direction of the rail groove 23 in the tightening state Z1. The width positioning mechanism serving positioning operation body 82b to position the location in which are at least provided.

  Hereinafter, the rail groove 23 and the attachment device 8 included in the attachment structure A according to the present embodiment will be described with reference to FIGS. 3 to 11. 6, 7, and 10 are cross-sectional views of the center of the mounting device 8 in the width direction. For convenience of explanation, an operating body 82 including a positioning operation portion 82 b that is a width positioning mechanism is illustrated by a solid line. To do.

  As shown in FIG. 3, the rail groove 23 is provided with respect to the base 2, and has an inner side surface 231 that stands facing each other from the bottom surface 20 </ b> B that is the first pressure receiving surface, and an open end surface that is continuous with the upper end of the inner side surface 231. 233. Further, the inner side surfaces 231 each have a protrusion 232. Specifically, the ridge 232 has a downward surface 234 that is a second pressure receiving surface, and the downward surface 234 and the bottom surface 20B of the ridge 232 are described later, a tightening mechanism Z, which will be described later. By being pressed by the pressing surface 842a and the engaging surface 832a, they are tightened.

  As shown in FIGS. 3, 4, 5, and 6, the attachment device 8 is a main body that is the main body of the attachment device 8 and is configured to be movable along the extending direction of the rail groove 23. A bracket 81; an operating body 82 rotatably attached to the upper side of the bracket 81; an expanding claw portion 83 provided at both longitudinal ends of the bracket 81; a pressing portion 84 provided on the lower surface side of the bracket 81; 81, a link portion 85 that can transmit the operating force of the operating body 82 to the pressing portion 84 and the expansion claw portion 83, and an expansion claw 832 that will be described later according to the operation of the link portion 85. An expansion claw drive unit 86 that can be driven from (Q) to the retracted position (P).

  As shown in the figure, the bracket 81 supports the desktop panel OP by an optional attachment portion 811 that can be attached to the upper portion, and the lower portion is an insertion end portion 81a that can be inserted into and removed from the rail groove 23 provided in the base 2. It is. Such a bracket 81 is mainly composed of a pair of housings 81b and 81b having a halved structure, and can be moved along the extending direction of the rail groove 23 by providing a wheel portion 816 at the insertion end portion 81a. Thus, the desktop panel OP can be suitably arranged according to the arrangement of the top board 5 and the like. Specifically, the bracket 81 can be inserted into an operating body mounting portion 812 that can pivotally mount an operating body 82 described later so that the operating body 82 can be rotated by approximately 90 °, and a transmission plate 861 described later can be accommodated in a predetermined position. It has a plate accommodating portion 813, a spring accommodating portion 814 that can accommodate a coil spring 862 to be described later, a claw mounting portion 815 that attaches the expanding claw portion 83, and a press accommodating portion 817 that can accommodate the pressing portion 84. .

  As shown in the figure, the operating body 82 is attached to the operating body mounting portion 812 of the bracket 81 so as to be rotatable by approximately 90 °. Specifically, the operating body 82 has the distal end side set as the operating end 821, and a pivoting operating body 82a pivotally attached to the link portion 85 in the vicinity of the rotation center, and layers on both sides of the pivoting operating body 82a. And a positioning operation body 82b constituting the width positioning mechanism according to the present invention, which can position the width direction when the bracket 81 is in the tightened state (Z1).

  The pivoting operation body 82a is provided with two link members 85a constituting the link portion 85 at both ends of the link attachment portion 82a1 positioned near the rotation center.

  The positioning operation body 82b constitutes the width positioning mechanism according to the present invention as described above, and the indentation portion X is formed at the end opposite to the operation end 821.

  The intrusion portion X has a guide surface X1 for guiding the bracket 81 to a predetermined position in accordance with the operation of the operating body, and a positioning surface X2 for positioning the bracket 81 to the predetermined position. In the tightened state (Z1) shown in FIG. 3, the bracket 81 is positioned at the center position between the inner side surfaces 231 of the rail groove 23 on both sides of the bracket 81. Will be described in detail later. In the present embodiment, the pivoting operation body 82a and the tightening operation body 82b are integrally attached to the operation body attaching portion 812 of the bracket 81 to constitute a single operation body 82.

  As shown in the figure, the expanding claw 83 is attached to two claw mounting portions on the insertion end 81a of the bracket 81, and has an expanding claw 832 that is symmetrical in cross-section and expanded. A rotating shaft 831 for rotatably mounting the claw 832 with respect to the bracket 81 and a torsion coil spring 833 for biasing the expanding claw 832 to the retracted position (P) are provided. The rotation shaft 831 is, for example, screwed in a state in which the expanding claws 832 are respectively passed through the claw mounting portions 815 of the bracket 81. The expansion pawl 832 includes an engagement surface 832a that can engage with the protrusion 232 of the rail 23a, specifically the downward surface 234, and a contact surface 832b that can contact a transmission plate 841 described later. Yes. In this embodiment, the rotation shaft 831 is provided closer to the insertion tip side in the insertion direction than the engagement surface 832a.

  As shown in the figure, the pressing portion 84 has a pressing portion main body 841 pivotally attached to the link portion 85 and a rubber-like pressing pad 842 attached below the pressing portion main body 841. Such a pressing portion 84 can move up and down in accordance with the operation of the link portion 85 accompanying the operation of the operating body 82. The pressing portion main body 841 has a pressing portion mounting portion 841a pivotally attached to the lower pivoting portion 852 of the link portion 85 on the upper side, and an insertion / extraction posture (Z3), which will be described later, according to the operation of the link portion 85. At this time, it has an upper end 841b that can push up a transmission plate 861 described later. The upper side of the pressing pad 842 is fixed to the pressing portion main body 841, and the lower side is set to the pressing surface 842a on which the first pressing surface according to the present invention is provided.

  The link portion 85 includes a pair of link members 85a and 85a, and is pivotally attached to the pivoting operation body 82a and the pressing portion main body 841 by the link members 85a and 85a. Specifically, the link portion 85 includes an upper pivot portion 851 pivotally attached to the link attachment portion 82a1 of the pivot attachment operation body 82a, and a lower pivot attachment portion 852 pivotally attached to the pressing portion attachment portion 841a of the pressing portion main body 841. And have.

  As shown in the figure, the expansion claw driving unit 86 includes a transmission plate 861 inserted and supported in the bracket 81, a coil spring 862 that is also supported in the bracket 81 and can bias the bracket 81, and an expansion claw. 832 has a claw contact portion 863 that contacts from above. Specifically, the transmission plate 861 is, for example, a resin plate formed in a generally U-shape when viewed in a front view and accommodated in a plate insertion groove 813 provided in the bracket 81, and the above-described coil spring 862 at the upper end. While being energized, a claw contact portion 863 is attached below. Further, the transmission plate 861 can move upward by being pressed from the lower side to the upper end portion 841b of the pressing portion main body 841, and this aspect will be described in detail later. The coil spring 862 can urge the transmission plate 861 from above while being accommodated in the spring accommodating hole 814 of the bracket 81. The claw contact portion 863 contacts the contact surface 832b of the spread claw 832 below the transmission plate, and the spread claw 832 can be set to the spread position (Q).

  The mounting device 8 described above includes the tightening mechanism Z that can be tightened with respect to the rail groove 23 by the above-described operating body 82, the expanding claw portion 83, the link portion 85, and the expanding claw driving portion 86. It is what constitutes.

  Here, as described above, the mounting structure A according to the present embodiment is a positioning operation body 82b that is a width positioning mechanism that positions the bracket 81 to a central position that is a predetermined position in the width direction of the rail groove 23 in the tightening state Z1. have. Then, by operating the positioning operation portion 82b and the tightening mechanism Z, the insertion end portion 81a of the bracket 81 is inserted into the rail groove 23 from above, and the mounting device 8 is positioned with respect to the rail groove 23 and tightened. A series of processes will be described in detail with reference to FIGS. 3 and 6 to 11.

  As shown in FIGS. 7, 8, and 9, the attachment device 8 shows the insertable / removable state (Z <b> 3) in a state where the operation end 821 of the operation body 82 is substantially vertical. That is, in this state, since the pressing portion 84 is raised in accordance with the operation of the link portion 85, the transmission plate 861 is pushed up by the upper end portion 841b of the pressing portion 84, compressing the coil spring 862, and in the operating range. Located at the top. As a result, as shown in FIG. 9, the claw contact portion 863 is separated from the spread claw 832, specifically, by being separated from the contact surface 832 b by the action of the torsion coil spring 833 provided on the spread claw portion 83. The opening claw 832 is positioned at the retracted position (P). That is, in this insertable / removable state (Z3), as shown in FIG. 8, the mounting device 8 has a wheel portion 816 that is in contact with the bottom surface 20B. The mounting device 8 can be easily inserted and removed from the groove 23.

  As shown in FIGS. 10, 11 and 12, when the operation lever 82 is rotated downward, for example, 45 ° from the above-described insertion / removal possible state (Z3), a travelable state (Z2) is established. In such a travelable state (Z2), as the link mounting portion 82a1 of the pivoting operation body 82a descends, the transmission plate 861 descends and the transmission plate 861 descends due to the elastic biasing force of the coil spring 862. Then, the claw contact portion 863 comes into contact with the contact surface 832b of the expanding claw 832 from above. At this time, each of the expansion claws 832 expands to the expansion position (Q) shown in FIG. That is, in this travelable state (Z2), as shown in FIG. 11, in the mounting device 8, the wheel portion 816 is in contact with the bottom surface 20B, so that good movement along the rail groove 23 is ensured. Since the opening claw 832 is at a position where it can face the downward surface 234 of the rail 23a, the attachment device 8 is prohibited from being removed from the rail groove 23.

  As shown in FIGS. 3 and 6, when the operation end 821 is rotated to a substantially horizontal position, the pressing portion 84 moves to a position slightly beyond the bottom dead center of the link positioned at the lowest position. That is, in this embodiment, the tightening state (Z1) is such that the operating body 82, the link portion 85, and the pressing portion 84 are stably positioned by using such a toggle structure. In such a tightened state (Z1), the expanding claw in the expanded position (Q) as the mounting device 8 excluding the pressing portion 84 rises when the pressing surface 842a of the pressing portion 84 presses the bottom surface 20B. The engagement surface 832a of 832 rises and comes into contact with the downward surface 234, so that the tightening mechanism Z stretches the bottom surface and the downward surface. In this way, the attachment device 8 is fixed so as not to move with respect to the rail groove 23.

  In particular, in the present embodiment, as shown in FIG. 3, the insertion portion X formed in the operation body 82, that is, the positioning operation body 82b is inserted, so that the gap between the bracket 81 and the inner side surface 231 is eliminated, and the bracket is It will be suitably positioned at the center position between the side surfaces 231. Specifically, when the operating body 82 is rotated to the tightening state Z (Z1), the guide portion X1 which is a tapered surface is gradually inserted into the gap while the guide surface X1 is in sliding contact with the opening end surface. Then, the positioning surface X2 comes into contact with the inner end surface 231 at the operation end of the operating body 82, so that the bracket 81 is reliably positioned at a predetermined position, that is, the center in the width direction between the inner side surfaces 231.

  With the configuration as described above, the option mounting structure A according to the present embodiment has the bracket 81 always positioned in the tightening state (Z1) by the positioning operation portion 82b as the width positioning mechanism. The operating force required to achieve the state (Z1) is always the operating force required at the center position in the width direction of the rail groove 23 that is the predetermined position. By doing so, it is possible to effectively avoid a configuration in which a large operating force is assumed assuming that the bracket 81 is displaced in the width direction or the operating force is obtained. That is, such an attachment structure A can be brought into the tightening state (Z1) with the minimum necessary operating force. By doing so, each component for attaching the optional desktop panel OP has a minimum size for obtaining such an operating force, so that the mounting structure A by the compact mounting device 8 can be realized. It has become. In addition, in the present embodiment, the indented portion X is further formed only in the positioning operation body 82 as the width direction positioning mechanism, that is, the indented portion X is simply inserted into the gap between the rail groove 23 and the bracket 81 as the main body from above. By adopting an extremely simple configuration, it is possible to obtain such actions and effects.

In this embodiment, since the bracket 81 is positioned at the center position between the inner side surfaces 231 of the rail groove 23, the engaging surfaces 832a of both the expanding claws 832 can suitably press the downward surface 234, respectively. Therefore, the rail groove 23 can be suitably tightened with the least operating force.
And by inserting the insertion part X between the inner surface 231 and the bracket, easy and reliable positioning can be realized. Further, by providing on both sides of the indentation bracket 81, positioning can be performed with a smaller operating force.

  In particular, in this embodiment, since the indented portion X is integrally provided in the single operating body 82, an easy operation is realized by using the operating force for setting the tightening mechanism Z in the tightening state (Z1) as it is. is doing. In other words, in the present embodiment, only by operating the single operating body 82, an insertable / removable state (Z 3) that can be inserted into and removed from the rail groove 23 of the attachment device 8, and the rail groove while prohibiting the removal from the rail groove. 23, a travelable state (Z2) in which a preferable movement along the rail 23 can be realized, and a tightening state (Z1) in which the mounting device 8 can be securely fixed to the rail groove 23 so as to be immovable. It can be realized only by rotating operation.

  Further, it is assumed that the bracket 81 has a guide surface X1 for guiding the bracket 81 to a predetermined position and a positioning surface X2 for positioning the bracket 81 to a predetermined position, so that the bracket 81 can be reliably positioned with a small operating force. Yes.

  Although the embodiment of the present invention has been described above, the specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, the tightening mechanism according to the above embodiment has a mode in which the downward surface and the bottom surface formed on the inner surface of the rail groove are pressed away from each other. However, the present invention is limited to such a configuration. Rather, for example, an aspect in which the upward surface formed on the ridge is pressed and compressed in a direction approaching the downward surface, an aspect in which the opening end surface of the rail groove upper end is pressed, or inner surfaces facing each other are pressed together. For example, the rail groove may be tightened in various modes such as a mode of tightening by stretching.

  Further, for example, the width positioning mechanism according to the above embodiment is provided only at one place in the extending direction of the rail groove, but as a plurality of places in the extending direction, the direction of the bracket as the main body is more accurately positioned. It may be possible.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

The external view which concerns on one Embodiment of this invention. Same as above. Structure explanatory drawing which concerns on the same embodiment. The perspective view which shows the principal part which concerns on the same embodiment. The principal part disassembled perspective view which concerns on the same embodiment. Sectional drawing which concerns on the same embodiment. Operation | movement explanatory drawing corresponding to FIG. Operation | movement explanatory drawing corresponding to FIG. The II sectional view taken on the line which concerns on FIG. Operation | movement explanatory drawing corresponding to FIG. Operation | movement explanatory drawing corresponding to FIG. II-II sectional view taken on the line which concerns on FIG.

Explanation of symbols

20B: Bottom surface, first pressure receiving surface (bottom surface)
23 ... Rail groove 231 ... Inner side surface 233 ... Opening end face 234 ... Second pressure receiving surface (downward surface)
81 ... Body (bracket)
81a ... Insertion end part 82 ... Operation body 82b ... Width positioning mechanism (positioning operation part)
83 ... engaging body (expansion claw part)
832a ... Second pressing surface (engagement surface)
84 ... engaging body (pressing part)
842a ... first pressing surface (pressing surface)
A ... Option mounting structure (Mounting structure)
Z1 ... tightening state Z ... tightening mechanism X ... indented portion X1 ... guide surface X2 ... positioning surface

Claims (5)

A rail groove having an inner surface that stands up against each other from the bottom surface, and an open end surface that is continuous with the upper end of the inner surface;
An optional mounting body that can insert and remove the insertion end into the rail groove,
An operating body provided in the main body for receiving an operating force;
An engagement body having a first pressing surface and a second pressing surface that can press the first pressure receiving surface and the second pressure receiving surface provided in the main body and provided in the rail groove, respectively;
A tightening state in which the rail groove is tightened by pressing the first pressing surface and the second pressing surface against the first pressure receiving surface and the second pressure receiving surface by an operating force applied to the operating body. A tightening mechanism;
An optional mounting structure comprising at least a width positioning mechanism for positioning the main body at a predetermined position in the width direction of the rail groove in the tightened state. The option mounting structure according to claim 1, wherein the width positioning mechanism has a fitting portion that fits between the main body and an inner surface of the rail groove. The optional mounting structure according to claim 2, wherein the indented portion is positioned on both sides of the main body. The operating body is a single operating body,
The option mounting structure according to claim 2 or 3, wherein the indented portion is formed integrally with the operating body. The option mounting structure according to claim 4, wherein the indented portion includes a guide surface that guides the main body to a predetermined position in accordance with an operation of the operating body, and a positioning surface that positions the main body to a predetermined position.

Images