Chair and attachment structure of front-part structure to base body

Abstract

To provide a chair or the like in which a base body and a front structure constituting a backrest can be suitably assembled.SOLUTION: A backrest (C) of a chair includes a base body (1) and a front-part structure (2) that is provided with a backrest surface, and is provided with one or a plurality of engaging protruding portions (12) that are provided so as to protrude from one of the base body (1) and the front-part structure (2), and one or a plurality of first engaged portions (S) that are provided on the other of the base body (1) and the front-part structure (2) and with which the engaging protruding portions (12) engage. The engagement projection part 12 is moved from the receiving part to the locking part and locked to the locking part, and the elastic engagement part T can be engaged with the second engaged part 13 only when the front structure 2 is moved to the second position with respect to the base body 2.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a chair and to a mounting structure for a front structure to a base body. [Background technology]

[0002] BACKGROUND ART Various chairs having a backrest made of a plate-like member have been known (see, for example, Patent Document 1).

[0003] In this type of chair, an attempt has been made to provide a seated person with a comfortable resting feeling by providing a cushion body on the plate-shaped backrest.

[0004] However, conventional cushioning devices have not been designed to stably and smoothly attach the cushioning body to the plate-like member.

[0005] In other words, in conventional chairs, when the cushion body is subjected to external force from the seated person, the cushion body is easily dislodged from the plate-like member, or the cushion body has to be attached to the plate-like member using a large number of screws. The use of a large number of screws not only mars the appearance of the chair, but also clearly increases the number of man-hours required for assembly workers.

[0006] The above circumstances are not limited to the cushion body. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2023-112388 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in light of the above circumstances, and aims to provide a chair in which at least the base body and front component constituting the backrest can be suitably assembled, and an attachment structure for the front component to the base body. [Means for solving the problem]

[0009] That is, the present invention has the following configuration.

[0010] The invention described in claim 1 is a chair with a backrest, the backrest comprising a base body mainly composed of plate-like portions extending in the up-down and left-right directions, and a front component having a backrest surface and attached to the front side of the base body, the backrest comprising one or more engaging protrusions protruding from either the base body or the front component, and one or more first engaged portions provided on the other and with which the engaging protrusions engage, the first engaged portions comprising a receiving portion into which the engaging protrusions are inserted when the front component is attached to the base body, and a receiving portion provided adjacent to the receiving portion and configured to engage the engaging protrusions in a predetermined direction. a locking portion that can be locked to the base body so as not to move, and an elastic engaging portion that is provided on either the base body or the front structure, and a second engaged portion that is provided on the other and engages the elastic engaging portion so as not to move in a predetermined direction, and the chair is configured so that by moving the front structure from a first position to a second position relative to the base body, the engaging convex portion moves from the receiving portion to the locking portion and is locked to the locking portion, and the elastic engaging portion can be engaged with the second engaged portion only when the front structure has moved to the second position relative to the base body.

[0011] The invention described in claim 2 is the chair described in claim 1, which comprises a plurality of the engaging convex portions and a plurality of the first engaged portions, and in which the engaging convex portions are arranged in the left-right central portion and both left and right portions of either the base body or the front structure, and the first engaged portions are arranged in the left-right central portion and both left and right portions of the other.

[0012] The invention described in claim 3 is the chair described in claim 1, wherein the engaging convex portion and the second engaged portion are provided on the base body, and the first engaged portion and the elastic engaging portion are provided on the front structure.

[0013] The invention described in claim 4 is the chair described in claim 1, wherein the front structure includes a support member made of synthetic resin arranged on the back side and a cushion arranged in front of the support member.

[0014] The invention described in claim 5 is the chair described in claim 1, wherein the first engaged portion is a bellows hole.

[0015] The invention described in claim 6 is a chair described in claim 1, wherein the second engaged portion is constituted by an engagement hole, and the elastic engaging portion has an engaging end that is inserted into the engagement hole.

[0016] The invention described in claim 7 is a chair described in claim 3, in which the backrest comprises a backrest main body constituted by the base body and the front structure, and a support frame that supports the backrest main body, and the second engageable portion is constituted by an engagement hole that is provided so as to penetrate the base body, and the engagement hole is arranged in a position that is hidden by the support frame when viewed from behind.

[0017] The invention described in claim 8 is a mounting structure for a front component to a base body that constitutes a chair, the structure comprising: the base body having a backrest mainly formed of plate-like portions extending in the up-down and left-right directions; and the front component having a backrest surface attached to the front side of the base body; and one or more engaging protrusions protruding from either the base body or the front component, and one or more first engaged portions that are provided on the other and with which the engaging protrusions engage; the first engaged portions having receiving portions into which the engaging protrusions are inserted when the front component is attached to the base body, and a receiving portion that is provided adjacent to this receiving portion and that prevents the engaging protrusions from moving in a first direction. and a locking portion that can be operably locked to the front structure, the locking portion being provided on either the base body or the front structure, and a second engaged portion that is provided on the other and engages the elastic locking portion so that it cannot move in a second direction, and the front structure is configured so that by moving the front structure from a first position to a second position relative to the base body, the engaging convex portion moves from the receiving portion to the locking portion and is locked to the locking portion, and the front structure is attached to the base body so that the elastic locking portion can be engaged with the second engaged portion only when the front structure is moved to the second position relative to the base body. [Effects of the Invention]

[0018] As described above, according to the present invention, it is possible to provide a chair in which at least the base body and front component constituting the backrest can be suitably assembled, and an attachment structure for the front component to the base body. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view showing an embodiment of the present invention; [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5]FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] 5A to 5C are cross-sectional views illustrating an attachment step in the embodiment. [Figure 12] Cross-sectional view taken along line XX in Figure 2. [Figure 13] 5A to 5C are cross-sectional views illustrating an attachment step in the embodiment. [Figure 14] Cross-sectional view of line YY in Figure 2. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, one embodiment of the present invention will be described with reference to FIGS.

[0021] The chair comprises a leg A, a seat B placed on the leg A, and a backrest C supported by the seat B. In this embodiment, a tilting unit (not shown) is interposed between the leg A and the seat B, which tilts the seat B and the backrest C forward and backward together.

[0022] The leg body A comprises four leg bodies a1 extending vertically and a base a2 supported by the four leg bodies a1. The base a2 is mainly composed of a rectangular plate-shaped member in a horizontal position supported by the four leg bodies a1.

[0023] The seat B comprises a cushioned seat body b1 having a seating surface, and a seat shell body b2 attached to the underside of the seat body b1.

[0024] <<Backrest C>> The backrest C comprises a backrest body D and a support frame E that supports the backrest body D. The support frame E that constitutes the backrest C is configured so that it can also function as an armrest.

[0025] <Backrest body D> The backrest body D comprises a base body 1 having a plate-shaped portion extending in the vertical and horizontal directions, and a cushion body 2 which is a front component provided with a backrest surface sm and attached to the front side of the base body 1.

[0026] [Base 1] The base body 1 comprises a base body main body 11 made of plywood, a plurality of, i.e., six, engaging protrusions 12 provided on the base body main body 11, and engaging holes 13, which are second engaging portions provided on the base body main body 11 and are horizontally elongated through holes arranged in pairs on the left and right.

[0027] The base body main body 11 has a horizontally elongated rectangular shape when viewed from the front. The base body main body 11 has a curved shape that is convex backward when viewed from the top. The base body 11 has four rounded corners.

[0028] A plurality of, i.e., six, engaging protrusions 12 are provided protruding forward from the base body main body 11. The six engaging protrusions 12 are arranged at two locations, one at the top and one at the bottom, in the middle of the left-right direction of the base body main body 11, two locations at the top and one at the bottom, in the left portion of the base body main body 11, and two locations at the top and one at the bottom, in the right portion of the base body main body 11. The engaging protrusions 12 are made of metal and are cylindrical overall.

[0029] The engaging protrusion 12 has a base end portion 121 attached by an appropriate method to the base body 11. The protruding end of the engaging protrusion 12 is provided with an expanded diameter portion 123 that is larger in diameter than the other portions.

[0030] The portion of the engaging protrusion 12 between the base end portion 121 and the expanded diameter portion 123 is a main portion 122 that engages with a locking portion s2 of the first engaged portion, which will be described in detail later. The main portion 122 is set to a dimension that is approximately the same as or slightly shorter than the width dimension of the locking portion s2 of the pothole S, which is the first engaged portion.

[0031] The enlarged diameter portion 123 has a retaining function that prevents the engaging protrusion 12 from slipping out in the front-rear direction from the pothole S. The enlarged diameter portion 123 is set to have a dimension longer than the width dimension of the locking portion s2 in the pothole S.

[0032] The engagement holes 13 are through holes. That is, the two engagement holes 13 are drilled so as to penetrate through the base body main body 11 in the thickness direction. The engagement holes 13 engage the elastic engagement portions T provided on the support member 21 so as to be immovable in a predetermined direction, i.e., the second direction, that is, upward (immovable relative to the base body 1).

[0033] The two engagement holes 13 are provided in the left-right center of the left half of the base body main body 11 and in the left-right center of the right half of the base body main body 11. The engagement holes 13 are adapted to engage with elastic engagement portions T provided on the cushion body 2. The engagement holes 13 are arranged in positions that are hidden by the upper frame portions e21 of the left and right frame portions e2 that constitute the support frame E when viewed from behind.

[0034] The hole indicated by the symbol h3 in the base body main body 11 is a screw insertion hole used when fixing the cushion body 2 to the base body 1 using a screw (not shown).

[0035] [Cushion body 2] The cushion body 2 includes a support member 21 made of synthetic resin arranged on the rear side, and a cushion base 22 arranged in front of the support member 21.

[0036] The support member 21 has a horizontally elongated rectangular shape when viewed from the front. The support member 21 has a curved shape that convexly faces rearward when viewed from the top. The support member 21 has four rounded corners. The dimensions of the support member 21 in the up-down and left-right directions are set shorter than those of the base body main body 11.

[0037] The support member 21 is provided with a plurality of, i.e., six, first engaged portions, i.e., bell-shaped holes S, with which the engaging protrusions 12 engage, and a plurality of, i.e., two, elastic engaging portions T, which can engage with the second engaged portions, i.e., the engaging holes 13, by utilizing the elastic deformation of the member, i.e., the synthetic resin.

[0038] The Daruma holes S have a shape similar to that of a Daruma doll (Bodhidharma). The Daruma holes S are provided at positions corresponding to the engaging protrusions 12 provided on the base body 1. That is, the Daruma holes S are provided at two locations, one at the top and one at the bottom, in the middle of the left-right direction of the support member 21, two locations at the top and one at the bottom, in the left part of the support member 21, and two locations at the top and one at the bottom, in the right part of the support member 21.

[0039] The keyhole S includes a receiving portion s1 into which the engaging protrusion 12 is inserted when the cushion body 2 is attached to the base body 1, and a locking portion s2 that is provided adjacent to the receiving portion s1 and that can lock the engaging protrusion 12 so that it cannot move in a predetermined direction, i.e., a first direction, that is, upward and left-right directions (it cannot move relative to the cushion body 2). In other words, the locking portion s2 can lock the cushion body 2 so that it cannot move downward and left-right relative to the base body 1 by engaging with the engaging protrusion 12 of the base body 1.

[0040] The elastic engagement portion T is provided at a position corresponding to the engagement hole 13 provided in the base body 1. That is, the elastic engagement portion T is provided at two locations, one on the left and one on the right side, of the support member 21. The support member 21 is cantilevered, extending in the vertical direction with its upper end as the base end. The elastic engagement portion T is provided at the tip end (lower end) of the cantilevered portion and has an engagement end t1 that is inserted into the engagement hole 13.

[0041] Here, the component designated by the reference numeral 211 in the support member 21 is a nut holding portion that holds a nut (not shown). When the cushion body 2 is fixed to the base body 1 using a screw (not shown), the screw (not shown) inserted into the screw insertion hole h3 of the base body main body 11 is screwed into the nut (not shown) held by the nut holding portion 211.

[0042] The cushion base 22 includes a cushion material (not shown) and a cover material F that encases the cushion material. The edge of the cover material F is sewn to the peripheral edge 21e of the support member 21.

[0043] <Support frame E> The support frame E is made primarily of cylindrical pipe material and includes a central frame section e1 disposed in the left-right middle of the chair, with its lower end connected to the rear of the seat shell body b2 and its upper portion extending in a generally straight line in the vertical direction, and left and right frame sections e2 whose rear ends are connected to the central frame section e1 and whose lower ends are connected to the seat B and the tilting unit, and which can also function as armrests.

[0044] A nut portion n1 is provided in the vertical middle portion of the central frame portion e1. A screw v1 is threadedly fastened to the nut portion n1 of the central frame portion e1, which is inserted into a screw insertion hole h1 provided in the horizontal middle portion of the lower part of the base body main body 11.

[0045] The left and right frame portions e2 comprise an upper frame portion e21 located at the top and arranged along the rear peripheral edge of the seat B, and a front frame portion e22 extending in the vertical direction, with its upper end continuing to the front end of the upper frame portion e21 and its lower end connected to the left and right sides of the rear of the seat shell body b2 and the left and right sides of the rear of the tilting unit.

[0046] The upper frame portion e21 extends in the left-right and front-rear directions, and its middle portion in the left-right direction is connected to the upper end of the central frame portion e1.

[0047] The upper frame portion e21 is disposed behind the base body main body 11 and hides the engagement holes 13 provided in the base body main body 11 so that they cannot be seen from the rear. The upper surfaces of the left and right front portions of the upper frame portion e21 are positioned so as to function as armrests for the seated occupant.

[0048] Nut portions n2 are provided on both the left and right portions of the upper frame portion e21. Screws v2 are threadedly attached to the nut portions n2 of the upper frame portion e21 through screw insertion holes h2 provided on both the left and right portions of the upper part of the base body main body 11.

[0049] <Attachment structure of cushion body 2 to base body 1> The structure for attaching the cushion body 2 to the base body 1 constituting the backrest main body D in the chair of this embodiment will be described with particular reference to FIGS.

[0050] The base body 1 has six engaging protrusions 12 protruding therefrom and two engaging holes 13 drilled therein. On the other hand, the cushion body 2 has six potholes S, which are first engaged portions with which the engaging protrusions 12 engage, and elastic engaging portions T, which can elastically engage with the two engaging holes 13 by utilizing elastic deformation of the member.

[0051] In this embodiment, by moving the cushion body 2 relative to the base body 1 from a first position, which is an installation start position (R), to a second position, which is an installation completion position (P), the engaging protrusion 12 moves from the receiving portion s1 in the bell-shaped hole S to the locking portion s2 and is locked to the locking portion s2.

[0052] Furthermore, in order to prevent the cushion body 2 from moving backward from the installation completion position (P) to the installation start position (R), the elastic engagement portion T is configured to engage with the engagement hole 13 only when the cushion body 2 moves to the installation completion position (P) relative to the base body 1. At the installation start position (R), the elastic engagement portion T is pressed against the base body main body 11, and as a result, the entire portion, including the engagement end t1, is forcibly elastically deformed forward. Then, when the elastic engagement portion T reaches the installation completion position (P), the engagement end t1 of the elastic engagement portion T enters the engagement hole 13 due to the elastic restoring force of the member that attempts to return to its original shape.

[0053] As explained above, the chair according to this embodiment is provided with a backrest C. The backrest C includes a base body 1 mainly composed of plate-like portions extending in the vertical and horizontal directions, and a cushion body 2 which is a front component provided with a backrest surface sm and attached to the front side of the base body 1.

[0054] The base body 1 is provided with a plurality of engaging protrusions 12 protruding therefrom, and a plurality of first engaged portions S that are provided on the cushion body 2 and engage with the engaging protrusions 12. The holes S are provided with a receiving portion s1 into which the engaging protrusions 12 are inserted when the cushion body 2 is attached to the base body 1, and a locking portion s2 that is provided adjacent to the receiving portion s1 and can lock the engaging protrusions 12 so that they cannot move in a predetermined direction.

[0055] It also includes an elastic engagement portion T provided on the cushion body 2 and an engagement hole 13, which is a second engaged portion provided on the base body 1 and engages with the elastic engagement portion T so that it cannot move in a predetermined direction.

[0056] The cushion body 2 is configured so that by moving the cushion body 2 relative to the base body 1 from a first position, which is an installation start position (R), to a second position, which is an installation completion position (P), the engaging protrusion 12 moves from the receiving portion s1 to the locking portion s2 and is locked to the locking portion s2, and the elastic locking portion T can engage with the locking hole 13 only when the cushion body 2 moves to the second position, which is the installation completion position (P), relative to the base body 1.

[0057] Therefore, this embodiment can provide a chair to which the base body 1 and the cushion body 2 that constitute the backrest main body D of the backrest C can be suitably assembled.

[0058] In other words, by moving (sliding) the cushion body 2 relative to the base body 1 from the installation start position (R) to the installation completion position (P), the cushion body 2 can be easily attached to the base body 1 with a single touch, which can contribute to reducing the amount of work required by the assembler.

[0059] Moreover, by moving (sliding) the cushion body 2 relative to the base body 1 from the installation start position (R) to the installation completion position (P), not only do the multiple engaging protrusions 12 engage with the multiple potholes S, but the multiple elastic engaging portions T engage with the multiple engaging holes 13. Therefore, the backrest main body D of this embodiment is designed to suitably prevent the cushion body 2 from moving backward from the installation completion position (P) to the installation start position (R) after assembly is complete.

[0060] It has a plurality of engaging protrusions 12 and a plurality of daruma holes S, and the engaging protrusions 12 are arranged in the left-right central part and on both the left and right sides of the base body 1, and the daruma holes S are arranged in the left-right central part and on both the left and right sides of the cushion body 2.

[0061] For this reason, the cushion body 2, which has a higher degree of freedom in the selection of components than the base body 1, is provided with a bell-shaped hole S having a more complex shape than the engaging protrusion 12, which contributes to improving productivity.

[0062] The engaging protrusion 12 and the engaging hole 13 which is the second engaged portion are provided on the base body 1, and the pothole S and the elastic engaging portion T are provided on the cushion body 2.

[0063] Therefore, the cushion body 2, which has a higher degree of freedom in the selection of components than the base body 1, is provided with not only a bell-shaped hole S having a more complex shape than the engaging protrusion 12, but also an elastic engaging portion T having a more complex shape than the engaging hole 13, which contributes to improving productivity.

[0064] The cushion body 2 includes a support member 21 made of synthetic resin arranged on the rear side, and a cushion base 22 arranged in front of the support member 21.

[0065] Therefore, not only does the support member 21 facilitate the formation of the hole S and the elastic portion, but the cushion base 22 can provide a suitable cushioning effect for the seated person.

[0066] In this embodiment, the first engaged portion with which the engaging protrusion 12 engages is the potbelly hole S, so that a configuration can be suitably realized in which the engaging protrusion 12 does not move in a predetermined direction.

[0067] In this embodiment, the second engaged portion with which the elastic engaging portion T engages is the engaging hole 13, and the elastic engaging portion T has an engaging end t1 that is inserted into the engaging hole 13. Therefore, the engaging hole 13 has a suitable configuration that makes it easy to provide the engaging hole 13 in a base body 1 made of a rigid material such as plywood.

[0068] The backrest C comprises a backrest body D composed of a base body 1 and a cushion body 2, and a support frame E that supports the backrest body D. An engagement hole 13 is provided so as to penetrate the base body 1, and the engagement hole 13 is disposed in a position that is hidden by the support frame E when viewed from behind.

[0069] Therefore, the support frame E prevents the engagement holes 13, which tend to spoil the appearance, from being visible, which contributes to the presentation of a good appearance to the chair.

[0070] The present invention is not limited to the above-described embodiment.

[0071] The chair may be any chair having at least a seat and a backrest.

[0072] The base body is not limited to being made of plywood, but may be made of, for example, synthetic resin, metal, or other materials.

[0073] The front component may be any component that is attached to the front side of the base body, and is not limited to a cushion body.

[0074] The engaging protrusions may be provided on either the base body or the front structure, i.e., the engaging protrusions are not limited to those provided on the base body side as in the above-described embodiment, but may be provided on the front structure side.

[0075] The first engagement portion may be provided on either the base body or the front structure. In other words, the first engagement portion is not limited to being provided on the front structure side as in the above-described embodiment, but may also be provided on the base body side.

[0076] The first engaged portion may have any suitable shape as long as it has a receiving portion and a locking portion. In other words, the first engaged portion may have a shape that is not a pothole.

[0077] The elastic engagement portion may be provided on either the base body or the front structure, i.e., the elastic engagement portion is not limited to being provided on the front structure side as in the above-described embodiment, but may also be provided on the base body side.

[0078] The second engaged portion may be provided on either the base body or the front constituent body. That is, the second engaged portion is not limited to being provided on the base body side as in the above-described embodiment, but may also be provided on the front constituent body side.

[0079] The second engaged portion is not limited to a through hole, but may be a hole with a bottom.

[0080] In the above-described embodiment, the first position is set above the second position, but this is not limiting and the first position may be set below the second position.

[0081] It goes without saying that the support frame that constitutes the backrest can take on a variety of shapes.

[0082] Furthermore, the specific configuration of each part is not limited to the above embodiment, and various modifications are possible within the scope of the present invention. [Explanation of symbols]

[0083] C...backrest D...Backrest body 1...Base body 2...Cushion body (front structure) 11...Base body 12...Engagement convex part 13...Engagement hole (second engaged part) 21...Support member 22...Cushion base S...Dragon-shaped hole (first engaged part) T...Elastic engagement part sm...backrest surface

Claims

1. A chair with a backrest, The backrest includes a base body mainly composed of a plate-like portion extending in the vertical and horizontal directions, and a front component body having a backrest surface and attached to the front side of the base body, one or more engaging protrusions protruding from one of the base body and the front structure, and one or more first engaged portions provided on the other of the base body and the front structure with which the engaging protrusions engage, the first engaged portion comprises a receiving portion into which the engaging convex portion is inserted when the front portion structure is attached to the base body, and a locking portion that is provided adjacent to the receiving portion and can lock the engaging convex portion so that it cannot move in a predetermined direction, an elastic engaging portion provided on one of the base body and the front structure, and a second engaged portion provided on the other of the base body and the front structure, which engages the elastic engaging portion so as to be immovable in a predetermined direction; the front structure is configured so that, by moving the front structure relative to the base body from a first position to a second position, the engaging protrusion moves from the receiving portion to the locking portion and is locked to the locking portion, The chair wherein the elastic engaging portion can engage with the second engaged portion only when the front structure is moved to the second position relative to the base body.

2. The engaging protrusions and the first engaged portions are provided in a plurality of positions, 2. The chair according to claim 1, wherein the engaging protrusions are arranged in a left-right central portion and both left and right portions of one of the base body and the front structure, and the first engaged portions are arranged in a left-right central portion and both left and right portions of the other of the base body and the front structure.

3. the engaging protrusion and the second engaged portion are provided on the base body, 2. The chair according to claim 1, wherein the first engaged portion and the elastic engaging portion are provided on the front structure.

4. 2. The chair according to claim 1, wherein the front structure comprises a support member made of synthetic resin and disposed on the rear side, and a cushion disposed in front of the support member.

5. 2. The chair according to claim 1, wherein the first engagement portion is a pothole.

6. the second engaged portion is configured by an engaging hole, 2. The chair according to claim 1, wherein the elastic engaging portion has an engaging end that is inserted into the engaging hole.

7. The backrest comprises a backrest body constituted by the base body and the front structure body, and a support frame supporting the backrest body, the second engaged portion is configured by an engaging hole provided so as to penetrate the base body, 4. The chair according to claim 3, wherein the engagement hole is disposed at a position hidden by the support frame in rear view.

8. A mounting structure for a front structure to a base body constituting a chair, The backrest includes the base body mainly composed of a plate-like portion extending in the vertical and horizontal directions, and the front component body having a backrest surface and attached to the front side of the base body, one or more engaging protrusions protruding from one of the base body and the front structure, and one or more first engaged portions provided on the other of the base body and the front structure with which the engaging protrusions engage, the first engaged portion includes a receiving portion into which the engaging protrusion is inserted when the front portion structure is attached to the base body, and a locking portion that is provided adjacent to the receiving portion and can lock the engaging protrusion so as to prevent it from moving in a first direction, an elastic engaging portion provided on one of the base body and the front structure, and a second engaged portion provided on the other of the base body and the front structure, the second engaged portion engaging the elastic engaging portion so as to be immovable in a second direction; the front structure is configured so that, by moving the front structure relative to the base body from a first position to a second position, the engaging protrusion moves from the receiving portion to the locking portion and is locked to the locking portion, An attachment structure for a front structure to a base body, wherein the elastic engaging portion is configured to be able to engage with the second engaged portion only when the front structure is moved to the second position relative to the base body.

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