JP2022047716A - Chair, option member attachment tool and attachment structure of option member attachment tool to chair - Google Patents

Abstract

To enable an option member attachment tool to be attached/detached to/from a backrest that has a curved square frame shape of a chair with one touch, and to enable the arrangement position in the height direction of an option member to be easily adjusted.SOLUTION: An option member attachment tool is fixed to a lower end part of an upper side rod part 11 so as to surround a protrusion part 25, a lower end surface 23 and an outer side surface 27 of the lower end part of the upper side rod part 11 of a backrest of a chair, a locking slider S is slidably inserted and arranged in a slider arrangement space 33 of an attachment tool body B in such a state of being biased to the back side by the elastic resilience of a compression spring 51, a rod insertion ring part 34 is integrally provided on the back side of the attachment tool body B, and a locking part 46a on the tip of each slider plate 46 is engaged with a locking hole 63 formed on a rod 62 of a hanger H inserted and arranged in the rod insertion ring part 34.SELECTED DRAWING: Figure 12

Description

The present invention relates to a chair in which an optional member attachment can be attached / detached with a single touch to a curved square frame-shaped backrest of a chair, an optional member attachment, and an attachment structure of the optional member attachment to the chair. be.

As the backrest of the chair, there is a structure in which the central part is opened by forming a curved square frame, and many applications have been filed for a structure in which optional members such as hangers can be detachably attached to the backrest of this structure. For example, Patent Document 1 discloses a chair backrest having the above structure and a mounting structure for optional members.

In Patent Document 1, a protruding portion 35 composed of first and second wall portions 36 and 37 having an L-shaped cross section is provided on the upper side of the backrest having a curved square frame shape, and the protruding portion is provided. The second wall portion 37, which constitutes 35 and is arranged substantially horizontally, is sandwiched between the first and second members 51 and 61, and the base end side contact portion provided on the second member 61 in an upright state. Disclosed is a structure for attaching an optional member attachment to a backrest of a structure in which the members 51 and 61 are connected by two fastening bolts 72 with the 63 applied to the back surface side of the first wall portion 36. ing. The second member 61 is provided with a holder 41 for supporting the hanger 46 so that the arrangement position along the height direction can be adjusted.

The attachment structure of the optional member attachment to the backrest of the chair disclosed in Patent Document 1 requires two independent members 51 and 61 as optional members, and the optional member attachment is required. As the mounting structure of the fitting, the work is performed in a state where the above-mentioned first and second members 51 and 61 are arranged with respect to the first and second wall portions 36 and 37 of the upper side chair portion of the backrest. By holding the first and second members 51 and 61 with two fastening bolts 72 in this state, the second wall portion 37 is sandwiched between the members 51 and 61. It is fixed.

Therefore, regarding the attachment of the optional member attachments to the backrest of the chair, the above-mentioned first and second members 51 and 61 are attached to the first and second wall portions 36 of the upper side of the backrest. It is extremely troublesome because it is necessary to hold the state arranged with respect to 37 by the operator's hand and connect the first and second members 51 and 61 with two fastening bolts 72 in this state. .. Moreover, although it is a normal design to place and fix the optional member attachment at the center of the upper side of the backrest in the longitudinal direction, the placement and fixing position is also marked in advance for the positioning of the placement and fixing position. It is necessary to keep it in place, which is also troublesome.

Japanese Unexamined Patent Publication No. 2017-79875

The present invention ensures accurate positioning of the optional member attachment to the curved square frame-shaped backrest of the chair and makes it removable with one touch, and the optional member for the optional member attachment. The challenge is to make it easy to adjust the placement position in the height direction.

The invention of claim 1 for solving the above-mentioned problems includes a curved square frame-shaped backrest having an open central portion, and the cross-sectional shape of the upper side of the backrest is connected to the bottom surface and the bottom surface. A chair having a shape in which an optional member attachment tool to which an optional member can be attached can be fitted to the lower end portions of the inner side surface and the outer side surface.
A protrusion is projected inward at the lower end of the inner surface of the upper side of the backrest.
The attachment main body of the optional member attachment is provided with a protrusion contact portion that abuts on the outside of the protrusion of the upper side rod portion and an outer surface contact portion that abuts on the outer surface of the upper side rod portion. Be,
In a state where the protrusion contact portion of the attachment main body is in contact with the outside of the protrusion of the upper side rod portion, the optional member attachment is rotated upward around the contact portion. By contacting the outer surface contact portion of the optional member attachment to the outer surface of the upper side rod portion, the optional member attachment portion is fitted to the lower end portion of the upper side rod portion in a temporarily fixed state. It is characterized by that.

According to the first aspect of the present invention, the optional member is attached centering on the contact portion in a state where the protrusion contact portion of the attachment main body is in contact with the outside of the protrusion of the upper side rod portion. By rotating the tool upward and the outer surface contact portion of the optional member attachment abuts on the outer surface of the upper side rod portion, the inner end surface, the lower surface surface, and the said portion of the protrusion portion of the upper side rod portion are brought into contact with each other. The lower end of the outer side surface is covered with the optional member attachment, and the optional member attachment is fitted to the lower end of the upper side rod portion in a temporarily fixed state. After that, the optional member attachment is fixed to the upper side rod via a bolt. As a result, the optional member attachment can be fitted to the lower end of the upper side of the chair with one touch, and the fixing work becomes easy.

The invention of claim 2 is an optional member to which an optional member can be attached to the upper side of the backrest of a chair having a curved square frame-shaped backrest with an open central portion, and to the back side of the backrest. It is a structure to attach the attachment,
The upper side rod portion includes a bottom surface and an inner side surface and an outer side surface connected to the bottom surface, and a protrusion is provided at the lower end portion of the inner side surface of the upper side rod portion of the backrest.
The attachment main body of the optional member attachment is provided with a protrusion contact portion that abuts on the outside of the protrusion of the upper side rod portion and an outer surface contact portion that abuts on the outer surface of the upper side rod portion. Be,
In a state where the protrusion contact portion of the attachment main body is in contact with the outside of the protrusion of the upper side rod portion, the optional member attachment is rotated upward around the contact portion. By contacting the outer surface contact portion of the optional member attachment to the outer surface of the upper side rod portion, the optional member attachment portion is fitted to the lower end portion of the upper side rod portion in a temporarily fixed state. It is characterized by that.

The invention of claim 2 is an expression of the invention of claim 1 grasped from the aspect of "a structure for attaching an optional member attachment to a chair", and a substantial effect is the invention of claim 1. Is equivalent to.

The invention of claim 3 is characterized in that, in the invention of claim 2, the angle between the bottom surface of the upper side of the backrest and the outer surface connected to the bottom surface is an acute angle.

According to the third aspect of the present invention, since the angle between the bottom surface of the upper side rod portion of the backrest and the outer surface is an acute angle, the optional member attachment is fitted to the lower end portion of the upper side rod portion of the backrest. The state is easily maintained, and the fitting cannot be easily released. Therefore, temporary fixing (temporary holding) of the optional member attachment tool to the lower end portion of the upper side rod portion of the backrest is ensured.

The invention of claim 4 is provided in the invention of claim 2 or 3 at a portion corresponding to the optional member attachment to the portion on the inner surface of the upper side of the backrest to which the optional member attachment is attached. A convex or concave portion corresponding to the concave or convex portion for positioning provided is provided, and the concave portion or the concave portion is provided.
In a state where the concave portion or the convex portion for positioning of the upper side rod portion of the backrest and the convex portion or the concave portion of the corresponding portion of the optional member attachment are fitted, the fitting portion is used as a fulcrum. It is characterized in that the optional member attachment is configured to rotate upward.

According to the fourth aspect of the present invention, in a temporarily fitted state in which the optional member attachment is partially fitted to the upper fulcrum portion of the backrest, the optional member attachment is mounted on the longitudinal portion of the upper fulcrum portion. When slid in the direction, the concave or convex portion for positioning provided on the inner surface of the upper side of the backrest is fitted with the convex or concave portion of the corresponding portion of the optional member attachment. In this state, when the optional member attachment is rotated upward with the fitting portion as a fulcrum, the optional member attachment is temporarily fixed to the lower end of the upper side of the backrest. Will be done. In this way, the mounting position of the optional member mounting tool can be reliably determined with respect to the longitudinal direction of the upper side rod portion of the backrest, and the optional member mounting tool can be fixed to the upper side rod portion of the backrest. Therefore, when the optional member attachment is bolted to the upper side of the backrest, the optional member attachment does not shift with respect to the upper side of the back. The work of fixing the bolts is also easy.

The invention of claim 5 is for attaching an optional member which is attached to the upper side of the backrest of a curved square frame shape in which the central part of the chair is opened and is arranged on the back side of the upper side of the chair. It is an optional member attachment,
The rod of the optional member is slidably inserted by being fitted to the lower end portion of the upper side rod portion so as to cover the lower surface of the upper side rod portion and arranged on the back surface side of the backrest in the fitted state. The attachment body, which is integrally provided with the rod insertion ring,
The tip of the attachment body is provided with a locking portion that is locked to any of a large number of locking holes provided along the longitudinal direction of the rod of the optional member inserted into the rod insertion ring portion. The internal slider arrangement space is provided with a locking slider that is slidably arranged in the width direction of the upper side rod portion while being urged to the side of the rod insertion ring portion by the urging means.
By opening the locking slider in a state where the locking slider is retracted with respect to the rod insertion ring portion of the attachment body against the urging force of the urging means, the tip of the locking slider is engaged. The stop portion is locked to any of the locking holes of the rod of the optional member, so that the rod cannot slide with respect to the rod insertion ring portion.

According to the fifth aspect of the present invention, a locking slider is provided on the side of the rod insertion ring portion by the urging means in the slider arrangement space of the attachment body fitted to the lower end portion of the upper side rod portion of the backrest of the chair. The locking slider is slidably arranged in the width direction of the upper side chair portion in a state of being urged to the urging means, and the locking slider is inserted against the urging force of the urging means to the rod insertion ring portion of the attachment body. By opening the locking slider in a state of being retracted with respect to the rod, the locking portion at the tip thereof is locked to any locking hole of the rod of the optional member, and the rod insertion ring portion is engaged. On the other hand, the rod cannot slide. As described above, according to the fifth aspect of the present invention, the locking slider is arranged in the slider arrangement space inside the fitting body, and the locking slider is inserted into the rod insertion ring against the urging force of the urging means. Unless the rod is retracted with respect to the portion, the locking hole of the rod of the optional member and the locking portion of the tip of the locking slider are not released. There is no problem that the member is suddenly lowered. That is, since the structure is arranged inside the attachment main body without providing a locking mechanism for locking the rod with the rod of the optional member to prevent the rod from moving downward in the rod insertion ring portion, the optional member. The overall configuration of the attachment is simplified, and the operation part of the locking slider has a structure that protrudes downward from the attachment body that is fitted to the lower end of the upper side rod of the backrest. Compared with the configuration in which the stopping mechanism is arranged in the rod insertion ring portion, the possibility that the locking portion of the locking slider and the rod of the optional member will be released is reduced.

The invention of claim 6 is the invention of claim 5, wherein the locking slider slidably arranged in the slider arrangement space of the attachment body is behind a pair of slider plates arranged at predetermined intervals. The ends are connected by an operation lever, and the inner portion of the locking portion, which is the tip of the pair of slider plates, is the elastic contact plate portion to which the front end of the compression spring constituting the urging means comes into contact. The rear end of the compression spring that is connected is elastically contacted with a compression spring elastic body that is fixedly arranged between the pair of slider plates, and the side of the rod insertion ring portion is cantilevered and held, and the slider of the attachment body is held. The slide guide rods arranged so as to project in the slide direction in the arrangement space are characterized in that they are inserted into the guide holes of the elastic contact plate portion to guide the sliding of the locking slider.

The invention of claim 6 specifies the fixation embodied as a subordinate concept of the invention of claim 5, and is a specification formed on the rod of the optional member inserted into the rod insertion ring portion of the attachment body. The rear end of the pair of slider plates is locked with the locking hole of the above and the locking portion of the tip of each slider plate of the locking slider arranged in the slider arrangement space of the attachment body. When the operating lever that integrally connects the two is slid inward (to the side of the seat of the chair) against the urging force (elastic restoring force) of the compression spring, the locking is released and the optional member is released. The arrangement position in the height direction of is adjustable. After changing the height position of the optional member, when the locking slider retracted inward is released, the locking slider is slid toward the rod insertion ring portion by the urging force of the compression spring. , The locking portion at the tip of each slider plate is locked in a locking hole different from the immediately preceding locking hole among a large number of locking holes provided in the rod of the optional member, and the height of the optional member is increased. The placement position in the direction is changed.

According to the first aspect of the present invention, in a state where the protruding portion contact portion of the mounting tool main body is in contact with the outside of the protruding portion of the upper side rod portion, the optional member mounting tool is centered on the contact portion. Is rotated upward so that the outer surface contact portion of the optional member attachment abuts on the outer surface of the upper side rod portion, whereby the inner end surface, the lower surface surface, and the outer surface of the protrusion portion of the upper side rod portion are brought into contact with each other. The lower end of the side surface is covered with the optional member attachment, and the optional member attachment is fitted to the lower end of the upper side rod in a temporarily fixed state, and then to the upper side rod via a bolt. The optional member attachment is fixed. As a result, the optional member attachment can be fitted to the lower end of the upper side of the chair with one touch, and the fixing work becomes easy.

In particular, as in the invention of claim 4, the optional member attachment is temporarily fitted to the upper fulcrum portion of the backrest, and the optional member attachment is slid in the longitudinal direction of the upper fulcrum portion. And, the concave portion or the convex portion for positioning provided on the inner surface of the upper side of the backrest and the convex portion or the concave portion of the corresponding portion of the optional member attachment are fitted, and in this state, the said When the optional member attachment is rotated upward with the fitting portion as a fulcrum, the optional member attachment is temporarily fixed to the lower end of the upper side rod portion of the backrest. In this way, the fixing position of the optional member attachment can be reliably determined with respect to the longitudinal direction of the upper side of the backrest, and the optional member attachment can be fixed to the upper side of the back.

According to the sixth aspect of the present invention, a locking mechanism for locking the rod with the rod of the optional member to prevent the rod from moving downward is arranged inside the attachment body without providing the rod insertion ring portion with the locking mechanism. The structure simplifies the overall configuration of the optional member attachment, and the operation part of the locking slider protrudes below the attachment body that is fitted to the lower end of the upper side rod of the backrest. Since it has a structure, there is less possibility that the locking portion of the locking slider and the rod of the optional member will be disengaged as compared with the configuration in which the locking mechanism is arranged in the rod insertion ring portion.

It is a perspective view which looked at the chair C which concerns on this invention from the back side. It is a side view of a chair C. The rod 62 is inserted and supported by the upper side rod portion 11 of the backrest 6 of the chair C, the optional member attachment A attached to the upper side rod portion 11, and the rod insertion ring portion 34 of the optional member attachment A. It is a perspective view of the separated state from the hanger H. It is a partial perspective view of the central portion of the upper side of the backrest 6 in the curved longitudinal direction as viewed from the inside. (A) is a cross-sectional view of a general portion of the upper side rod portion 11 of the backrest 6, and (b) is a cross-sectional view of a portion in which the nut body 31 of FIG. 4 is embedded. It is an exploded perspective view of the optional member attachment A and the hanger H. (A) and (b) are perspective views of the optional member attachment A as viewed from different directions. (A) and (b) are perspective views of the optional member attachment A, which is partially broken, as viewed from different directions. The optional member attachment tool A temporarily fitted to the lower end of the upper side rod portion 11 of the backrest 6 is slid in the longitudinal direction of the upper side rod portion 11 to form a positioning convex portion 29 of the upper side rod portion 11. FIG. 3 is a plan view showing a state in which the positioning recess 39 of the attachment main body B is fitted and positioned. (A) is a cross-sectional view showing a state in which the optional member attachment tool A temporarily fitted while being positioned with respect to the longitudinal direction of the upper side rod portion 11 of the backrest 6 is rotated upward to be fitted. It is a figure, (b) is an enlarged view of the part represented by W of (a). It is a partial cross-sectional view which shows the bolt fixing structure of the optional member attachment A with respect to the upper side of a backrest 6. In (a) and (b), the locking portion 46a at the tip of the locking slider S of the optional member attachment A and the locking hole 63 formed in the rod 62 of the hanger H are locked. It is a vertical sectional view of the state and the state in which the lock is released. FIG. 12 (a) is an enlarged cross-sectional view taken along the line XX.

Hereinafter, the present invention will be described in more detail with reference to the best examples. First, the chair C provided with the backrest 6 to which the optional member attachment A according to the present invention is attached will be described with reference to FIGS. 1 to 4, and then the optional member attachment A will be described in detail. explain.

As shown in FIGS. 1 to 3, the chair C has a plurality of legs 2 radially arranged around the pedestal 1 and a box-shaped chair C integrally provided at the upper end of the pedestal 1. A support base 3, a seat 4 integrally provided on the upper portion of the support base 3, a pair of armrests 5 standing upright on both sides of the seat 4 in the support base 3, and the support base. A backrest 6 is provided on the back surface side of the seat 4 in No. 3 so as to be arranged so as to be slightly inclined toward the rear. The backrest 6 has a portion 1/3 from the lower end protruding most forward along the height direction, and the overall shape thereof is a curved rectangular frame shape that is curved in a side view. The central portion is a large opening 7. Therefore, the backrest 6 includes an upper side rod portion 11 that is curved in a plan view so as to have a gentle concave shape inward on the side of the seat body 4, and a lower side rod portion 12 that is curved in substantially the same shape. The optional member attachment A according to the present invention is composed of a pair of left and right side rod portions 13a and 13b, and is fitted to the lower end portion of the curved longitudinal central portion of the upper side rod portion 11 of the backrest 6. It can be attached with a wearing structure. The inner surface side of the opening 7, the upper side rod portion 11, the lower side rod portion 12, and the pair of left and right side side rod portions 13a, 13b of the backrest 6 is covered with a sheet 14 made of a mesh material.

As shown in FIGS. 1 and 3, the backrest 6 is formed by injection molding of a resin, and the overall shape of the upper side rod portion 11 is concave on the inside (side of the seat 4) in a plan view. As shown in FIG. 5, the cross section is U-shaped, and the thick-walled side wall portion 21 is arranged so as to be slightly inclined inward in the used state. At the upper end of the side wall portion 21, a seat end locking portion 22 having a curved surface on the entire circumference and having a shape in which a part of the side wall portion 21 protrudes inward is integrally provided, and the optional member can be removed. The lower end surface 23 of the lower end portion of the side wall portion 21 to which the fitting A is fitted is formed in a planar shape, and the inner side surface 24 of the lower end portion of the side wall portion 21 has a thick plate-shaped protrusion toward the inside. By forming 25, an inner recess 26 is formed between the protruding portion 25 and the seat end locking portion 22. The wall thickness of the thick side wall portion 21 is constant along the height direction, the inner side surface 24 and the outer surface 27 are parallel to each other, and the outer surface 27 and the lower end surface 23 of the main body portion. The crossover angle (θ) of is an acute angle. In FIG. 5, 28 shows a sheet insertion fixing groove for inserting and fixing the upper end portion of the sheet 14.

Optional members are taken so as to surround the protruding portion 25, the lower end surface 23, and the outer surface 27 at the lower end portion of the central portion in the longitudinal direction of the upper side rod portion 11 gently curved so that the inside is concave. The fitting A is fitted. Therefore, as shown in FIGS. 4 and 5, the positioning recess 39 of the mounting tool main body B of the optional member mounting tool A is provided on the end surface of the central portion of the protruding portion 25 of the upper side rod portion 11 in the longitudinal direction. A positioning protrusion 29 is provided so as to be fitted to the object and perform positioning. As shown in FIGS. 3, 4 and 11, in the portion corresponding to both sides of the positioning convex portion 29 at the lower end portion of the upper side rod portion 11, the nut body embedded protrusion 30 thicker than the side wall portion 21 is formed. Is partially projected toward the tip end side of the protruding portion 25, and the nut body 31 is embedded in the nut body embedded protrusion 30. Since the nut body 31 is inserted (set) in the cavity of the molding die at the time of injection molding of the backrest 6, it is integrally embedded in the lower end portion of the upper side rod portion 11 to be injection molded. Bolt insertion holes 32a and 32b communicating with the female threaded portion are formed through the upper and lower portions of each nut body 31 embedded in the nut body embedded protrusion 30. In addition, in FIG. 11, the space portion 20 having a predetermined height is provided between the nut body embedded protrusion 30 and the seat end locking portion 22 immediately above the nut body embedded protrusion 30, which enables a thick portion in the side wall portion 21. At the time of injection molding of the upper side rod portion 11, "sink marks" are generated on the outer surface 27 of the side wall portion 21 corresponding to each nut body embedded protrusion 30, and the appearance of the outer surface 27 is reduced as much as possible. This is to prevent it from being harmed.

Next, with reference to FIGS. 6 to 13, the back of the backrest 6 of the chair C is fitted to the lower end of the curved longitudinal center portion of the upper side of the backrest 6 of the chair C. An optional member attachment tool A for arranging the hanger H on the side with adjustable height will be described. The optional member attachment A is provided in the attachment body B fitted to the lower end of the upper rod portion 11 and the slider arrangement space 33 inside the attachment body B, and the back surface of the attachment body B. It is composed of a locking slider S arranged so as to advance and retreat with respect to the rod insertion ring portion 34 integrally provided on the side. The overall shape of the optional member attachment A is three-dimensionally symmetric with respect to the left-right symmetry line K (see FIG. 9). Both the attachment body B and the locking slider S are formed by injection molding of resin. Since the attachment main body B has a function of being fitted to the lower end portion of the upper side rod portion 11 and a function of enabling the locking slider S to be arranged in the internal slider arrangement space 33, "slider arrangement" is performed. It can also be called "body".

A rod insertion ring portion 34 is integrally provided on the back surface side of the attachment main body B in a state of being fitted to the lower end portion of the upper side rod portion 11. Since the attachment main body B is fitted to the lower end portion of the upper side rod portion 11, the upper surface 36 of the attachment main body B can be brought into close contact with the flat lower end surface 23 of the upper side rod portion 11. The upper surface 36 of the attachment body B is formed in a flat shape as described above, and a horizontally long thick plate-like protrusion that is in close contact with the tip surface of the protrusion 25 of the upper side rod portion 11 and the outer surface 27, respectively. The portion contact portion 37 and the block-shaped outer surface contact portion 38 are provided so as to project upward in a state of facing each other along the slide direction P of the locking slider S. The inner surface of the protrusion contact portion 37 is the contact surface 37a, and the outer surface contact portion 38 has the surface facing the contact surface 37a as the contact surface 38a. The protrusion contact portion 37 is provided over the entire width of the attachment main body B, but the outer surface contact portion 38 is provided only at the central portion of the attachment main body B in the width direction. The contact surface 37a of the protrusion contact portion 37 and the contact surface 38a of the outer surface contact portion 38 are curved corresponding to the shape in which the upper side rod portion 11 is gently curved along the longitudinal direction. At the same time, the angle (θ) formed by the upper surface 36 of the attachment body B and the contact surface 38a of the outer surface contact portion 38 is the angle formed by the lower end surface 23 of the upper side rod portion 11 and the outer surface 27 (the angle formed by the lower end surface 23 of the upper side rod portion 11). It is formed at the same acute angle as θ). A positioning recess 39 fitted with a positioning protrusion 29 formed on the protrusion 25 of the upper side rod portion 11 of the backrest 6 is formed at the central portion of the contact surface 37a of the protrusion contact portion 37 in the longitudinal direction. Has been done.

A slider arrangement space 33 (see FIGS. 8, 12, and 13) slightly wider than the width of the locking slider S is formed in the central portion of the attachment body B in the width direction. Since the slider arrangement space 33 is formed in a form in which a total of four surfaces, upper and lower and both sides, are closed with respect to the attachment main body B, and a part of the front surface and the entire back surface are opened. The main body B has a solid structure except for the slider arrangement space 33 and the lid arrangement space 40 in which the lid portion 52a of the compression spring bullet contact body 52 described later is arranged. The slider arrangement space 33 has a hollow shape corresponding to a rectangular parallelepiped shape which is the overall shape of the locking slider S, and the cross-sectional shape thereof corresponds to a horizontally long rectangular shape which is the cross-sectional shape of the locking slider S. It has a rectangular parallelepiped shape. Here, the shape in which a part of the front surface of the slider arrangement space 33 is opened means that, as shown in FIGS. 8 and 13, the lateral central portion of the horizontally long rectangular opening is the total height due to the closing plate portion 41. The pair of left and right locking portions 46a of the locking slider S, which will be described later, are inserted into both sides of the closing plate portion 41 to enter the insertion space 34b of the rod insertion ring portion 34. A pair of locking portion insertion holes 42 are formed over the entire height. The closing plate portion 41 is provided with a slide guide rod 43 for guiding the slide of the locking slider S so as to project inside the slider arrangement space 33 in a cantilever shape.

As shown in FIGS. 6, 8, 12, and 13, the locking slider S is integrally connected to the rear ends of a pair of slider plates 46 at predetermined intervals in the lateral direction by an operation lever 47. At the same time, the inner portion of the locking portion 46a at the tip of the pair of slider plates 46 is connected by the bullet contact plate portion 48 to which the front end portion of the compression spring 51, which will be described later, comes into contact with each other. A rod insertion hole 48a through which the slide guide rod 43 is inserted is formed in the bullet contact plate portion 48.

Then, as shown in FIGS. 6, 8, 12, and 13, the compression spring 51 is arranged on the back surface side of the bullet contact plate portion 48 between the pair of slider plates 46 constituting the locking slider S. In this state, the locking slider S is inserted into the slider arrangement space 33 of the attachment main body B, and the locking portion 46a at the tip of each slider plate 46 is inserted into the locking portion 46a provided on the attachment main body B. In the state of being inserted into the insertion hole 42 [the state shown in FIG. 12A], the rectangular block-shaped compression spring bullet contact body 52 is arranged between the pair of slider plates 46 through the lid portion arrangement space 40. , The lid portion 52a of the compression spring bullet contact body 52 is arranged in the lid portion arrangement space 40 of the attachment main body B, and the compression spring bullet contact body 52 is attached on the bottom surface side of the attachment main body B. When the tool body B is fixed to the bottom plate portion 44 via the screw 53, the locking slider S is slidably incorporated into the slider arrangement space 33 of the tool body B. In this assembled state, the slide guide rod 43 integrally provided in the attachment body B is inserted into the rod insertion hole 48a of the bullet contact plate portion 48, and the locking slider S moves in all directions when sliding. Is regulated, and the slide guide rod 43 is inserted inside the compression spring 51 to stabilize the slide motion.

The bottom plate portion 44 forming the slider arrangement space 33 is cut off in the middle along the slide direction P of the locking slider S, and the rear end surface thereof is with the stopper surface 44a to which the operating lever 47 constituting the locking slider S abuts. The position of the forward end of the locking slider S is restricted. The operating lever 47 of the locking slider S extends downward beyond the bottom plate portion 44, and the operating portion 47a is extended downward from the rod insertion ring portion 34 by a human fingertip against the elastic restoring force of the compression spring 51. By pressing it to the separated side, it is possible to release the locking portion 46a at the tip of the locking slider S and the locking hole 63 formed in the rod 62 of the hanger H. As shown in FIG. 12, the stopper surface 44a of the bottom plate portion 44 is flush with a specific surface of the rectangular parallelepiped block-shaped compression spring bullet contact body 52.

Optional member attachments A are positioned and fitted to the lower ends of the backrest 6 of the chair C on both sides of the lid arrangement space 40 in the attachment main body B along the longitudinal direction of the backrest 6. In the state of being temporarily fixed, a pair of bolt insertion holes 45 for fixing the optional member attachment A to the backrest 6 is formed through the pair of holed bolts 71. As shown in FIG. 11, the pair of perforated bolts 71 are screwed to the pair of nut bodies 31 embedded in the lower end portion of the backrest 6.

A flat annular rod insertion ring portion 34 for inserting and supporting the rod 62 of the hanger H is integrally formed on the back surface side of the attachment main body B. The hanger H has a thick plate-shaped rod 62 at the center in the longitudinal direction of the linear lower half portion 61a of the hanger main body 61 having a large hollow portion formed therein and forming an irregular annular shape as a whole. It is provided so as to be perpendicular to the half portion 61a. On the front surface of the plate-shaped rod 62, a plurality of sets of locking holes 63, which are a pair of left and right pairs, are formed at regular intervals along the longitudinal direction.

The rod insertion ring portion 34 has a length in which two sets of locking holes 63 among a plurality of sets of locking holes 63 formed on the front surface of the rod 62 of the hanger H are completely inserted and arranged inside. The attachment main body B is integrally provided at the front portion of the rod insertion ring portion 34. The attachment main body B is integrally provided at substantially the center of the rod insertion ring portion 34 along the insertion direction of the rod 62, so that the rod insertion ring portion 34 has a predetermined length with respect to the attachment main body B. Only extends both upwards and downwards. The upper surface of the outer surface contact portion 38 of the attachment body B is flush with the upper end surface of the rod insertion ring portion 34. As shown in FIGS. 7, 8 and 13, a plurality of sliding contact protrusions 34a that partially slide against the outer peripheral surface of the rod 62 of the hanger H are provided on the inner peripheral surface of the rod insertion ring portion 34. , Are formed along the insertion direction of the rod 62 at predetermined intervals along the circumferential direction.

Next, with reference to FIGS. 9 and 10, a method of fitting the optional member attachment tool A to the central portion in the longitudinal direction of the lower end portion of the upper side rod portion 11 of the backrest 6 of the chair C will be described. First, as shown in FIG. 9, the attachment main body B of the optional member attachment A is arranged at the lower end of the backrest 6, and the protrusion contact portion 37 and the outer surface contact portion 38 are used. When the lower end of the upper side rod portion 11 of the backrest 6 is temporarily fitted and the optional member attachment tool A is slid along the longitudinal direction of the upper side rod portion 11, the solid line in FIG. 9 and the two points in FIG. As shown by the chain line, the upper surface 36 of the attachment body B and the lower end surface 23 of the upper side rod portion 11 are separated from each other, and the positioning convex portion 29 at the tip of the protrusion 25 of the upper side rod portion 11 and the take-off portion 29. The position of the optional member attachment tool A with respect to the longitudinal direction of the upper side rod portion 11 is determined by fitting the positioning recess 39 of the attachment body B and making it non-slideable. After that, when the entire optional member attachment A is slightly upwardly rotated around the fitting portion between the positioning protrusion 29 and the positioning recess 39, the outer surface of the attachment body B is contacted. The contact surface 38a of the contact portion 38 and the outer surface 27 of the upper side rod portion 11 are in close contact with each other, and the upper surface 36 of the attachment body B and the lower end surface 23 of the upper side rod portion 11 are in close contact with each other. The optional member attachment tool A is fitted to the lower end portion of the above with one touch. In this state, the perforated bolts 71 are inserted into the pair of bolt insertion holes 45 of the attachment main body B, and each perforated bolt 71 is embedded in each nut body 31 at the lower end of the upper side rod portion 11. When screwed to, the optional member attachment tool A is fixed to the lower end portion of the upper side rod portion 11 in a positioned state. Further, by performing the reverse operation of the above, the optional member attachment tool A attached to the upper side rod portion 11 of the backrest 6 of the chair can be removed with one touch. In FIG. 9, 31a indicates a female threaded portion formed on the nut body 31.

In this way, with the optional member attachment tool A temporarily fitted to the lower end of the upper side rod portion 11 of the backrest 6 of the chair, the option member attachment tool A is slid in the longitudinal direction of the upper side rod portion 11. Then, the positioning convex portion 29 provided on the upper side chair portion 11 and the positioning concave portion 39 provided on the attachment main body B are fitted, and the entire optional member attachment A is centered on the fitting portion. If The member attachment tool A can be fitted and temporarily fixed with one touch. Therefore, the optional member attachment tool A can be easily and accurately attached to and detached from the upper side rod portion 11 of the backrest 6 of the chair.

Then, as shown in FIGS. 12A and 13, the rod 62 of the hanger H is inserted into the rod insertion ring portion 34 of the optional member attachment tool A, and a plurality of sets of locking provided on the rod 62 are engaged. The locking portion 46a at the tip of the locking slider S enters the specific locking hole 63 of the holes 63 by the elastic restoring force of the compression spring 51, so that the locking hole 63 and the locking portion 46a are locked. In this state, the position of the rod 62 in the vertical direction with respect to the rod insertion ring portion 34 is determined, and the rod 62 cannot move up and down. As a result, as shown in FIG. 1, the hanger H is attached to the back side of the upper side rod portion 11 of the backrest 6 of the chair C via the optional member attachment tool A, and the hanger H is attached to the hanger main body 61 for office work. An unnecessary jacket 72 is hung during work.

In the above state, in order to change the height position of the hanger H with respect to the backrest 6 of the chair C, as shown in FIG. 12 (b), the locking protruding downward from the lower surface of the attachment body B. When an operating force F is applied to the operating portion 47a of the operating lever 47 of the slider S toward the front (the side of the seat 4 of the chair C) by a human fingertip, the operating force F is applied against the elastic restoring force of the compression spring 51. The stop slider S retracts, the locking hole 63 of the rod 62 and the locking portion 46a of the locking slider S are released, and the rod 62 of the hanger H can move up and down with respect to the rod insertion ring portion 34. .. When the rod 62 of the hanger H is moved in the vertical direction with the locking slider S retracted against the elastic restoring force of the compression spring 51 opened, a different set of locking holes from the immediately preceding one is used. The locking portion 46a at the tip of the locking slider S is inserted and locked with respect to 63, and the height position of the hanger H with respect to the backrest 6 of the chair C is changed.

Further, the angle (θ) formed by the lower end surface 23 and the outer surface 27 of the upper side sword portion 11 is an acute angle in order to ensure that the optional member attachment tool A is fitted to the lower end portion of the upper side sword portion 11. It is desirable that the angle is 90 ° as long as the fitted state can be maintained by the frictional force between the outer surface 27 and the contact surface 38a of the outer surface contact portion 38 of the optional member attachment A, unless the angle is obtuse. But it is possible.

Further, regarding the configuration of the locking slider in which the locking portion is formed at the tip, the locking portion of the locking slider is urged to the side of the rod insertion ring portion of the optional member attachment by the urging means. The present invention is not limited to the above embodiment as long as the configuration can maintain the locking of the optional member with the locking hole of the rod.

The uneven portions of the positioning convex portion 29 provided on the protruding portion 25 of the upper side rod portion 11 of the backrest 6 and the positioning concave portion 39 provided on the protruding portion contact portion 37 of the attachment main body B shall be reversed from each other. Is also possible.

In the above embodiment, the hanger H is exemplified as an optional member, but other members such as a cane may be used.

A: Optional member mounting tool B: Mounting tool body C: Chair H: Hanger (optional member)
S: Locking slider θ: Formation angle between the lower end surface and the outer surface of the upper side spring portion 6: Backrest 11: Upper side rod portion 21: Side wall portion 25: Protruding portion 27: Outer surface 29: Positioning convex portion 33: Slider arrangement Space 34: Rod insertion ring portion 37: Protruding portion contact portion 37a: Protruding portion contact portion contact surface 38: Outer surface contact portion 38a: Outer surface contact portion contact surface 39: Positioning recess 43: Slide Guide rod 46: Slider plate 46a: Sliding plate locking part 47: Operation lever 48: Bullet contact plate part 51: Compression spring 52: Compression spring bullet contact body 62: Hanger rod 63: Rod locking hole

Claims (6)

It has a curved square frame-shaped backrest with an open central part, and the cross-sectional shape of the upper side of the backrest is such that the bottom surface and the lower ends of the inner and outer surfaces connected to the bottom surface. It is a chair with a shape that allows the optional member attachment to be attached to the back side of the backrest.
A protrusion is projected inward at the lower end of the inner surface of the upper side of the backrest.
The attachment main body of the optional member attachment is provided with a protrusion contact portion that abuts on the outside of the protrusion of the upper side rod portion and an outer surface contact portion that abuts on the outer surface of the upper side rod portion. Be,
In a state where the protruding portion contact portion of the mounting tool main body is in contact with the outside of the protruding portion of the upper side chair portion, the optional member mounting tool is rotated upward around the contact portion. By contacting the outer surface contact portion of the optional member attachment to the outer surface of the upper side sill portion, the optional member attachment is fitted to the lower end portion of the upper side sill portion in a temporarily fixed state. A chair that features that. With a structure in which an optional member attachment tool that can attach an optional member to the back side of the backrest is attached to the upper side of the backrest of a chair equipped with a curved square frame-shaped backrest with an open central part. There,
The upper side rod portion includes a bottom surface and an inner side surface and an outer side surface connected to the bottom surface, and a protrusion is provided at the lower end portion of the inner side surface of the upper side rod portion of the backrest.
The attachment main body of the optional member attachment is provided with a protrusion contact portion that abuts on the outside of the protrusion of the upper side rod portion and an outer surface contact portion that abuts on the outer surface of the upper side rod portion. Be,
In a state where the protruding portion contact portion of the mounting tool main body is in contact with the outside of the protruding portion of the upper side chair portion, the optional member mounting tool is rotated upward around the contact portion. By contacting the outer surface contact portion of the optional member attachment to the outer surface of the upper side sill portion, the optional member attachment is fitted to the lower end portion of the upper side sill portion in a temporarily fixed state. The mounting structure of the optional member attachment to the chair is characterized by this. The structure for attaching an optional member attachment to a chair according to claim 2, wherein the angle formed by the bottom surface of the upper side of the backrest and the outer surface connected to the bottom surface is an acute angle. On the inner surface of the upper side of the backrest, where the optional member attachment is attached, a concave portion or a convex portion corresponding to the positioning concave portion or the convex portion provided in the corresponding portion of the optional member attachment is provided. Is provided,
In a state where the concave portion or the convex portion for positioning of the upper side chair portion of the backrest and the convex portion or the concave portion of the corresponding portion of the optional member attachment are fitted, the fitting portion is used as a fulcrum. The structure for attaching an optional member attachment to a chair according to claim 2 or 3, wherein the optional member attachment is configured to rotate upward. It is an optional member attachment tool for attaching the optional member arranged on the back side of the upper side of the chair, which is attached to the upper side of the backrest in the shape of a curved square frame with the central part open. hand,
The rod of the optional member is slidably inserted by being fitted to the lower end portion of the upper side rod portion so as to cover the lower surface of the upper side rod portion and arranged on the back surface side of the backrest in the fitted state. The attachment body, which is integrally provided with the rod insertion ring,
The tip of the attachment body is provided with a locking portion that is locked to any of a large number of locking holes provided along the longitudinal direction of the rod of the optional member inserted into the rod insertion ring portion. The internal slider arrangement space is provided with a locking slider that is slidably arranged in the width direction of the upper side rod portion while being urged to the side of the rod insertion ring portion by the urging means.
By opening the locking slider in a state where the locking slider is retracted with respect to the rod insertion ring portion of the attachment body against the urging force of the urging means, the tip of the locking slider is engaged. An optional member attachment having a structure in which the stop portion is locked to any of the locking holes of the rod of the optional member so that the rod cannot slide with respect to the rod insertion ring portion. .. The locking slider, which is slidably arranged in the slider arrangement space of the attachment body, has a pair of slider plates arranged at predetermined intervals, and the rear ends thereof are connected by an operation lever and the pair. The inner portion of the locking portion, which is the tip end portion of the slider plate, is connected by the elastic contact plate portion to which the front end of the compression spring constituting the urging means comes into contact, and the rear end of the compression spring is the pair. The slide guide is elastically contacted with a compression spring elastic body fixedly arranged between the slider plates, and the side of the rod insertion ring portion is cantilevered and is arranged so as to project in the slider arrangement space of the attachment body in the slide direction. The optional member attachment according to claim 5, wherein the rod is inserted into a guide hole of the elastic contact plate portion to guide the locking slider by sliding.

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