JP6097049B2 - Chair - Google Patents

Description

  The present invention relates to a chair provided with a headrest device that is rotatable around a pivot in the left-right direction with respect to the backrest.

  As a chair provided with a headrest device on the backrest, for example, those disclosed in Patent Documents 1 to 4 below are known. In the chairs disclosed in these patent documents, the headrest device includes a support member that is fixedly supported on the backrest of the chair, and a headrest body that can adjust the vertical position with respect to the support member. Since the seated user can move and adjust the headrest body to his / her optimum position, the headrest can be adjusted to the optimum state according to the user's various work forms, which is very convenient It is expensive.

  And in the chair shown by patent document 2, although a headrest main body can be moved up and down, in the chair shown by patent documents 1, 3, and 4, a headrest apparatus has a pivot in the left-right direction. In addition, the headrest body can be adjusted to rotate back and forth in accordance with the posture of the seated person.

Japanese Patent No. 4202691 Japanese Patent No. 4278793 European Patent No. 1186257 Japanese Patent Laid-Open No. 2003-079474

  For example, in the highly functional chair disclosed in Patent Document 1, in addition to the vertical movement of the headrest body, the headrest body can be adjusted to rotate back and forth according to the posture of the seated person. And as a structure, the headrest body has a support cylinder as a support member, and a pillow body supported by an elevating rod that can move up and down with respect to the support cylinder can be raised and lowered. It is hinged. However, since the left and right width of the support cylinder as the support member of the headrest body is formed to be narrower than the left and right width of the headrest body, a twisting force is likely to occur around the holding cylinder. In use, the headrest body is twisted due to the movement of the seated person's head, causing discomfort to the user.

  Further, in Patent Document 2, since the support rod as the support member is in a lot shape, twisting is likely to occur around the support rod, and when the headrest body is twisted, the torsional force is a force that bends the support rod. There is a possibility that the support rod is likely to be deteriorated by acting.

  And in patent document 3, while the headrest support | pillar as a support member is spaced apart from the left and right of the headrest, the right and left headrest support | pillar is connected by the connection member. As a result, the durability against the twisting force of the headrest column is enhanced, but the headrest is attached to the headrest column while bending the headrest, which may make it difficult to mount the headrest.

  Furthermore, in patent document 4, the headrest support | pillar as a support member has comprised frame shape, and is a structure which supports a headrest from right and left back. As a result, the durability against the torsional force of the headrest support is enhanced, but there is a problem that the frame always appears behind the headrest in terms of design, and restrictions on the design of the chair increase.

  As described above, when the strength of the support member is insufficient, the headrest body is twisted due to the movement of the seated person's head during use, which causes discomfort to the user. Further, when the strength of the headrest support is increased, the support becomes thicker and the aesthetic appearance is deteriorated, and the handling of the headrest device itself is complicated, which is not practical.

  The present invention has been made paying attention to such problems, and in a chair including a headrest device that can be rotated around a pivotal axis in the left-right direction formed on the backrest, the headrest body can be turned on a support member. It aims at providing a chair provided with a headrest device which can prevent a twist etc. of a headrest main part generated by a headrest pillar by giving a function.

In order to solve the above problems, the chair of the present invention is:
In a chair provided with a headrest device that is rotatable about a pivot in the left-right direction with respect to the backrest,
The headrest device is used for coupling the backrest and the headrest body, and provides a fixed portion that is fixed to the backrest, and a pivot shaft that provides a left and right pivot portion on the top of the fixed portion and outside the backrest. And a plate having a predetermined width extending at least in the internal space of the headrest body, and pivoted at the pivot portion together with the headrest body with respect to the pivot shaft portion. And an extending member.
According to this feature, since the extending member rotates together with the headrest body around the rotation shaft portion provided at the upper portion of the fixing portion fixed to the backrest of the support member, the fixing portion The rotating shaft portion is provided close to each other. Moreover, the headrest body is supported from the inside with a predetermined width by the extending member, and the headrest body can be prevented from being twisted due to the headrest column. Further, since the extending member having a plate shape can be accommodated in the internal space of the headrest body, the appearance is preferable.

The chair of the present invention
The extending member includes at least pivoting portions formed on the left and right ends of the extending member that are pivotally connected to the rotating shaft portion of the supporting member, and includes a left-right positioning means for the supporting member. It is characterized by having.
According to this feature, since the left and right ends of the plate-like extending member having a predetermined width in the left-right direction are pivotally attached to the rotation shaft portion of the support member, the strength is secured against the torsional force in the left-right direction. Thus, it is possible to reliably prevent the headrest body from being twisted. In addition, since the extending member includes positioning means in the left-right direction with respect to the support member, the attaching operation of the extending member to the support member can be facilitated.

The chair of the present invention
A plurality of recesses are formed in the extension member in the front-rear direction on the inside of the pivoting portion as the positioning means, and the rotation shaft portion of the support member is guided by the recess of the extension member. A plurality of convex portions are formed.
According to this feature, in addition to facilitating the attaching operation of the extending member to the support member by the positioning means, the positioning means is used when the headrest body is rotated and adjusted in the front-rear direction. Since the extending member and the rotating shaft portion are relatively rotated in the front-rear direction in a state where the protrusion and recess are fitted to each other, the strength is secured against the torsional force in the left-right direction, and the headrest body is twisted. It can be surely prevented.

The chair of the present invention
A stopper mechanism for restricting the rotation of the extension member and the support member is provided in a space sandwiched between pivoting portions formed at the left and right ends of the extension member, and the space is formed by a cover member. It is characterized by being shielded.
According to this feature, since the stopper mechanism is shielded by the cover member, it is possible to reduce the risk of pinching fingers with the stopper mechanism. Further, the rotating part can be effectively concealed by the cover member, and the design can be improved.

The chair of the present invention
The extension member is a plate-like member having a predetermined width extending at least into the internal space of the headrest body, and the headrest body is movable in the vertical direction with respect to the plate-like extension member. It is characterized by being.
According to this feature, even when the headrest body is moved upward, a plate-like extending member having a predetermined width is interposed between the headrest body and the upper end of the backrest of the chair. The gap between them is always closed. Therefore, since no gap is formed between the headrest body and the upper end of the backrest of the chair, the headrest body is not only a chair having a good-looking headrest device but also a plate-like extending member having a predetermined width. By supporting, the twist etc. which generate | occur | produce in a headrest main body can be prevented.

The chair of the present invention
The headrest body includes a pillow portion that elastically supports a head of a seated person, a main plate that supports the pillow portion, and a pair of left and right guide members provided on the main plate, and the pair of left and right guides The member is guided by the plate-like extending member in the vertical direction so as to be movable.
According to this feature, the pair of left and right guide members are fixed to the main plate that supports the pillow portion, and the pair of left and right guide members are relatively moved while being supported accurately and reliably by the extending member in the vertical direction. Therefore, the twist etc. which generate | occur | produce in a headrest main body can be prevented more reliably.

The chair of the present invention
The plate-shaped extending member has a vertical length that is at least shorter than the vertical length of the main plate, and a deformation-allowing space in which the plate-shaped extending member does not exist can be disposed at an upper position of the headrest body. It is characterized by that.
According to this feature, it is possible to secure a deformation-allowing space in which the plate-like extending member is not located at the upper position of the headrest body that supports the head of the seated person. Can be properly protected. In addition, by ensuring this space, the seated person's head feels the hardness of the headrest body when the seated person applies a force to rotate the headrest body to his / her optimal position. The headrest device can be used comfortably.

It is a front view which shows the chair in an Example. It is a side view which shows a chair. (A) is a front view which shows a headrest apparatus, (b) is a rear view similarly. It is a front side perspective view which shows the structural member of a headrest apparatus. (A) is a front side perspective view showing a cushion member, (b) is a front side perspective view showing a main plate, and (c) is a front side perspective view showing a back cover. (A) is a front side perspective view which shows an extending member and a latching tool, (b) is a front side perspective view which shows a guide member. (A) is a front side perspective view which shows an internal fitting member, (b) is a front side perspective view which shows a supporting member, (c) is a front side perspective view which shows a front cover. (A) is an AA end view in FIG. 3, (b) is a BB end view, and (c) is a CC end view. (A) is DD end elevation in FIG. 3, (b) is also EE end elevation, (c) is also FF end elevation. (A) is a perspective view which shows a frictional force provision member and a to-be-frictioned force provision member, (b) is a sectional side view which shows the aspect of a fitting with a frictional force provision member and an extending member. It is a GG end elevation in FIG. (A) is a side end view which shows the aspect of rotation and a vertical movement of a headrest main body, (b) is a front side perspective view which shows the aspect of the vertical movement of the internal fitting member with respect to an extending member. It is a front side perspective view of the partial cross section which shows the internal structure of a headrest apparatus. It is a back side perspective view which shows the attachment aspect to the backrest frame of a headrest apparatus.

  EMBODIMENT OF THE INVENTION The form for implementing the chair which concerns on this invention is demonstrated below based on an Example.

  The chair according to the embodiment will be described with reference to FIGS. First, reference numeral 1 in FIG. 1 is a chair to which the present invention is applied. The chair 1 includes a leg 4 in which five leg rods 3 each having a caster 2 at a distal end thereof are radially arranged, a telescopic leg 5 erected at the center of the leg 4, and a leg 5 A support base 6 fixed to the upper end of the support base 6, a seat 7 disposed above the support base 6, and two backrest support rods 9 pivotally attached to the left and right sides of the support base 6 so as to be pivotable in the front-rear direction. , 9, a backrest 10 supported on the back upper part of the backrest supporting saddles 9, 9, and a headrest device 40 attached to the upper back of the backrest 10.

  As shown in FIGS. 1 and 2, the support base 6 has a box shape that is long in the front-rear direction, and the rear end portion is fixed to the pedestal 5. The support base 6 accommodates a compression coil spring (not shown) that constantly urges the upper surface of the seat 7 forward, and an adjusting means (not shown) that adjusts the urging force of the compression coil spring. .

  Further, the seat 7 is formed by attaching a synthetic resin seat plate (not shown) whose upper surface and side peripheral surface are covered with a cushioning material 16 to a seat frame 15 having a substantially square frame shape when viewed from above. And the front part and the rear part of the support ring 17 which make | form a square ring shape by upper surface view are each fixed to the front part and rear part of the seat frame 15. As shown in FIG. The left and right sides of the support ring 17 are inclined outward and upward in a front view, and the front and rear sides are inclined outward and downward in a side view. The left and right sides of the support ring 17 are as shown in FIG. Moreover, it is connected to a seat support portion 30 provided on the front side of the backrest support rod 9 so as to be rotatable. The front portion of the support ring 17 is urged forward by a compression coil spring provided on the support base 6.

  Thereby, when the backrest 10 is inclined backward by the seated person, the backrest supporting collar 9 is inclined rearward and downward, and the rear portion of the seat 7 is moved downward and downward. As the rear portion of the seat 7 moves, the support ring 17 slides rearward and downward against the urging force of the compression coil spring, while the front portion of the seat 7 moves rearward and downward. Then, due to the urging force of the compression coil spring, a back turning force is generated in the backrest 10, and a returning force is generated in the front and upper direction in the seat 7, thereby improving the sitting comfort for the seated person.

  Alternatively, the backrest 10 and the support base 6 may be connected via a gas spring (not shown) so that the backrest 10 is always urged forward by the gas spring. Thereby, the return turning power of the backrest 10 by the gas spring and the return force of the seat 7 are generated, and the sitting comfort can be further improved.

  Next, as shown in FIG. 2, the backrest support rod 9 extends in the front-rear direction and is curved upward on the rear side. And the front-end part of the backrest support rod 9 is attached to the side of the support base 6 via the rotating shaft 8 extended in the left-right direction. Thereby, the backrest support rod 9 can be rotated in the vertical direction about the rotation shaft 8 as a central axis.

  Further, the backrest support rod 9 has a substantially triangular seat support portion 30 protruding slightly from the side of the backrest support rod 9 slightly behind the pivot shaft 8. Both left and right side portions of the support ring 17 are attached to the seat support portion 30 via rotating shafts 31 extending in the left-right direction. Further, at the rear end portion of the backrest support rod 9, a convex engagement convex portion (not shown) that can be engaged with an engagement concave portion (not shown) in the lower portion of the backrest frame 18 described later, and a vertical direction A through-hole (not shown) penetrating through is formed.

  The backrest support rod 9 has an optional support portion 32 that is substantially square and recessed inward on the outer side surface behind the seat support portion 30. An optional support rod (not shown) for supporting an armrest or a memo stand as an option of the chair 1 can be attached to the option support portion 32.

  As shown in FIG. 1, the backrest 10 includes a backrest frame 18 made of a frame-like body made of a substantially square hard synthetic resin, and a tension material 19 made of a mesh material. This frame-like body has an opening surface 12 whose lower side gradually becomes slightly narrower when viewed from the front, and the mesh material processed into a substantially rectangular shape is in front of the opening surface 12 in a state of being strained vertically and horizontally. It is stretched from. The upholstery material 19 may be made of a material other than the mesh material, such as a woven fabric or a canvas. Further, instead of the tension member 19, a cushion material or the like whose back side is supported by a plate-like body may be disposed at the center of the backrest frame 18.

  The backrest frame 18 includes a pair of left and right horizontal frames 20 and 20 extending in the vertical direction, and an upper frame extending in the horizontal direction so as to connect the upper ends of the horizontal frames 20 and 20 to each other. 21 and a lower frame 22 extending in the left-right direction so as to connect the lower ends of the lateral frames 20, 20 (see FIG. 2).

  The lower frame 22 has a shape that is gently curved so that the center in the left-right direction protrudes most backward when viewed from above. On the left and right sides of the lower portion of the lower frame 22, there are recessed engagement recesses (not shown) that engage with engagement protrusions (not shown) of the backrest support rod 9, and the inner side of the lower frame 22. A through-hole (not shown) extending toward is provided at a predetermined position corresponding to the engaging convex portion and the through-hole. The backrest frame 18 and the backrest support rod 9 are firmly fixed by the concave-convex engagement between the engagement convex portion and the engagement concave portion and the fastener (not shown) inserted into the through hole. It has become.

  Further, the upper frame 21 has a shape that is gently curved so that the center in the left-right direction protrudes most rearward and downward when viewed from above. As shown in FIG. 14, a concave fitting recess 13 is formed in the central portion on the back side of the upper frame 21 and has a substantially trapezoidal shape extending in the left-right direction and recessed toward the front side. . This fitting recessed part 13 can fit the convex fitting convex part 95 of the headrest apparatus 40 mentioned later inside. Furthermore, two insertion holes 25 penetrating inward of the upper frame 21 are formed in the fitting recess 13 on the left and right sides. The headrest device 40 according to the present invention is fixed to the upper frame 21 as shown in FIGS. 1 and 2 using the fitting recess 13 and the insertion hole 25.

  Next, the headrest device 40 according to the present invention will be described with reference to FIGS. 8, the left side of the sheet is described as the front side of the chair 1, and in FIG. 9, the upper side of the sheet is described as the front side of the chair 1. FIG. 9 is a lower end view.

  As shown in FIG. 3, the headrest device 40 includes a headrest body 41 that supports the head of the seated person from behind, an attachment portion 42 that supports the headrest body 41 and is attached to the backrest 10, and a headrest body that is attached to the attachment portion 42. The rotary shaft part 112 which rotatably supports 41 is comprised.

  As shown in FIG. 4, the headrest body 41 includes a cushion member 43 that protects the seated person's head, a main plate 44 that supports the cushion member 43 from the rear, and a back cover member 45 that covers the back of the main plate 44. An extension member 46 that supports the main plate 44 on the mounting portion 42, a guide member 47 that is fixed to the main plate 44 and holds the extension member 46 so as to be movable up and down, and an internal fitting member 48 that covers the lower surface of the main plate 44. Become.

  On the other hand, the attachment portion 42 is provided on a support member 49 that supports the extending member 46 of the headrest body 41 so as to be rotatable in the front-rear direction and is attached to the backrest 10. Further, the rotation shaft portion 112 is provided on the upper side of the support member 49, and the frictional force applying member 50 that allows the extending member 46 to be relatively rotatable with respect to the support member 49 and can be fixed at a predetermined angle. And a frictional force applying member 51, and a connecting bolt 82 that connects the support member 49 and the extending member 46 via the frictional force applying member 50 and the frictional force applying member 51.

  Next, members relating to the headrest body 41 will be described with reference to FIGS. As shown in FIG. 3, the cushion member 43 of the headrest body 41 has a substantially rectangular shape that gradually becomes slightly wider downward when viewed from the front. Further, as shown in FIG. 8, the cushion member 43 is gently curved so that the center in the vertical direction protrudes most forward in a side sectional view, and the upper end portion is rearward with a larger curvature than this curve. It has a bent shape. Further, as shown in FIG. 9, the cushion member 43 is gently curved so that the center in the left-right direction is recessed most backward in the upper cross-sectional view, and both left and right ends are bent backward with a larger curvature than this curve. It has a different shape. And the cushion member 43 comprises the pillow part of this invention.

  Further, the cushion member 43 is made of a cushion material that is an elastic material entirely covered with a cloth, and covers a main plate 44 described later from above and from the side. And the cushion material is arrange | positioned thickly in the upper part of the cushion member 43 compared with another site | part. Thereby, a pillow part comes to be able to support a seated person's head elastically.

  Thus, when the head of the seated person comes into contact with the headrest body 41 from the front or the front upper side, the impact of the contact is absorbed by the cushion member 43 so that the head is supported and protected.

  Next, as shown in FIG. 5, the main plate 44 has substantially the same outer shape as the cushion member 43, and is formed of a thin plate-like body having a substantially rectangular shape that gradually becomes slightly wider downward when viewed from the front. Further, as shown in FIGS. 8 and 9, the main plate 44 has a shape that is gently curved so that the center in the vertical direction protrudes most forward in a side view, and the center in the left and right direction in a top view. It has a shape that is gently curved so as to be recessed most rearward. Further, the main plate 44 is formed so that the vertical width and the horizontal width are slightly narrower than the cushion member 43 so as to be covered by the cushion member 43.

  A thick plate-like forward portion 53 that protrudes forward and extends in the left-right direction is provided at the lower portion on the front side of the main plate 44. In addition, the forward portion 53 is formed with a slit-like through-hole portion 54 that penetrates in the vertical direction and extends in the horizontal direction. Further, screw holes 55 and 55 are provided on both the left and right sides of the lower surface of the forward portion 53.

  In addition, a bent portion 56 that is bent forward with a curvature larger than the curvature of the main plate 44 in the left-right direction and the left-right direction as a whole is formed on the outer peripheral edge of the main plate 44. Further, a plurality of linear protrusions 57 protruding forward are formed in the thin plate-like portion of the main plate 44 in the left-right direction, the up-down direction, and the oblique direction. As a result, the main plate 44 has increased strength against stress in the front-rear direction, the left-right direction, and the up-down direction, and withstands the impact when the seated person's head comes into contact with the headrest body 41, the front plate 44 Can be supported.

  Further, as shown in FIGS. 8B and 9B, the predetermined protrusion 58 of the main plate 44 is lowered from the vicinity of the center so that the front surface of the protrusion 58 contacts the back surface of the extending member 46. The width in the front-rear direction is wider than the upper part. Using these protrusions 58, the main plate 44 supports the extending member 46 from the rear. As a result, the contact area between the main plate 44 and the extending member 46 is reduced. Therefore, when the height of the headrest body 41 is adjusted by a seated person or the like as will be described later, the contact between the main plate 44 and the extending member 46 is reduced. The sliding resistance is reduced, and the seated person can easily adjust the height.

  Furthermore, screw holes 59 for fixing the guide member 47 to the main plate 44 are provided at the four corners of the main plate 44. Further, the back surface of the main plate 44 is covered with a back cover member 45 formed in substantially the same shape as the main plate 44.

  Next, as shown in FIG. 6A, the extending member 46 has a shape in which a cylindrical body facing the left-right direction is continuously formed at the lower part of the plate-shaped body curved in the front-rear direction. . Further, as shown in FIGS. 8 and 9B, the plate-like body portion of the extending member 46 is curved forward along the front of the main plate 44 in a side sectional view, and the main plate 44 in an upper sectional view. It has a shape that curves backward so as to follow the front face. The length of the extending member 46 in the left-right direction is formed to have a predetermined width that is sufficient to support the headrest main body 41 without twisting or the like.

  Further, as shown in FIG. 6A, an important notch 60 that is wide in the left-right direction and greatly cut downward is formed in the center of the upper part of the plate-like body of the extending member 46. . By providing the important cutout portion 60, the vertical length of the central portion of the extending member 46 is formed shorter than the vertical length of the main plate 44. Thereby, the headrest device 40 provided with the extending member 46 secures a space V in which the extending member 46 does not exist at the upper center position of the headrest body 41 (see FIG. 13).

  In this space V, the cushion member 43 disposed in front of the extending member 46 is not supported from the rear by the extending member 46. The space V functions as a deformation allowing space for the cushion member 43 to be deformed when the seated person's head or the like comes into contact with the headrest body 41. By disposing the cushion member 43 as an elastic material in the space V, the seated person's head is appropriately protected. Also, as shown in FIG. 12A, when the headrest body 41 is pulled up, a space S is created above the extending member 46, the deformation-allowing space further expands, and the head of the seated person comes into contact. The shock is absorbed well.

  And the concave wide groove part 61 wide in the left-right direction is extended in the up-down direction in the center part of the front side of a plate-shaped object. A slit hole 62 is formed in the center of the wide groove portion 61. The slit hole 62 is a hole having a predetermined length that communicates in the front-rear direction and extends in the up-down direction. A guide pin 63 described later can be inserted into the slit hole 62. Instead of the slit hole 62 of the present embodiment, a groove having a predetermined length extending in the vertical direction may be formed in the center of the wide groove portion 61, and the guide pin may be movably fitted along the groove.

  Further, the vertical length of the slit hole 62 is determined when the headrest body 41 and the mounting portion 42 are relatively moved while the slit hole 62 and the guide pin 63 are engaged, that is, by a seated person or the like. When the height of the headrest device 40 is adjusted, the headrest device 40 is formed to have a predetermined length so that a seated person or the like can adjust the headrest device 40 to a comfortable height.

  Further, on the left and right sides of the wide groove portion 61, a plurality of narrow groove portions 64 having a narrower width in the left-right direction than the wide groove portion 61 and extending in the vertical direction are formed side by side in the left-right direction. And on the back side of the plate-like body, narrow groove portions 65 similar to those on the front side are formed between the narrow groove portions 64 on the front side so that the thickness in the front-rear direction of the plate-like body is substantially equal in the left-right direction. A plurality of them are formed between them (see FIG. 9B). By making the thickness of the plate-like body in the front-rear direction substantially uniform in the left-right direction, it is possible to prevent the impact when the head of a seated person or the like comes into contact with the headrest device 40 from being concentrated on a part of the plate-like body. Is done.

  Further, on the front side of the plate-like body on both the left and right sides of the important notch 60, a substantially rectangular recess 66 that is recessed rearward is formed. The upper and lower inner peripheral wall portions of the rectangular recess 66 are communication ports 67 and 67 that communicate with the rear, respectively. A hem portion 70 of a hook 69 that is engaged with a wave-like groove portion 68 of a guide member 47 described later is inserted into the communication port 67 (see FIG. 8C).

  As shown in FIG. 6A, the latch 69 is formed of a belt-like body extending in the vertical direction. A hook portion 71 is formed at the central portion in the vertical direction of the hook 69 so as to have a substantially U shape protruding forward in a side sectional view and to be hooked to the waved groove 68 of the guide member 47 as will be described later. (See FIG. 8C). In addition, hem portions 70 extending in the vertical direction are provided on the upper and lower sides of the engaging portion 71. The skirt portion 70 can be inserted into the communication ports 67 and 67 of the extending member 46. Furthermore, the hook 69 is made of a metal plate such as iron and has flexibility in the front-rear direction. The hook 69 may be made of, for example, a synthetic resin as long as it has flexibility in the front-rear direction.

  On the other hand, the cylindrical body provided in the lower part of the plate-like body is formed so that the outer diameter of the central portion in the left-right direction becomes gradually larger than the outer diameters on both sides. Further, notches 72 and 72 as positioning means of the present invention are provided on both the left and right sides of the cylindrical body so as to be notched up to the plate-like body. An attachment cylindrical portion 73 of a support member 49 to be described later is fitted into the notches 72 and 72. When the extending member 46 is attached to the support member 49, the extending member 46 is attached so that the mounting cylindrical portions 73 and 73, which are positioning means for the support member 49, are fitted into the notches 72 and 72. By causing the support member 49 to approach from above, the extending member 46 and the support member 49 can be easily positioned in the left-right direction.

  And the wide recessed part 74 which was dented toward the upper side and was formed comparatively wide on the lower surface of the cylindrical body in the notch parts 72 and 72 is extended in the circumferential direction of the cylindrical body, respectively. Yes. A projecting surface portion 75 of a support member 49 described later is fitted into the wide concave portion 74 so as to be slidable in the circumferential direction.

  Further, an opening 76 is formed at the central portion in the left-right direction of the cylindrical body of the extending member 46 so that the front side is opened so that the inner peripheral surface on the back side is exposed. And the notch recessed part 77 as a positioning means of this invention notched in the circumferential direction and back toward the back of the cylindrical body is formed in the left-right direction at the lower end of the wall surface on the back side of the remaining cylindrical body. A plurality (11 in this embodiment) of a predetermined distance are provided. The notch recess 77 is in contact with a narrow protrusion 78 of the support member 49 described later. When the extension member 46 is attached to the support member 49, the extension member 46 is supported so that the predetermined notch recess 77 abuts on a predetermined narrow protrusion 78 that is a positioning means of the support member 49. By approaching the member 49 from above, the extension member 46 can be easily positioned in the left-right direction with the support member 49.

  The width and number of the notch recesses 77 and the narrow protrusions 78, the separation distance, and the like are determined by the notch recesses 77 and the narrow widths of the load applied when the head of the seated person contacts the headrest body 41 of the headrest device 40. It may be changed as appropriate as long as the protrusion 78 can withstand.

  Further, inside the cylindrical body between the cutout portion 72 and the open portion 76, as shown in FIG. 9C, there are a large diameter insertion hole 79 and a small diameter insertion hole 80 having a coaxial line with the cylindrical body. It has been drilled. Further, as shown in FIG. 10B, a support concave groove 81 that is spaced 120 degrees in the circumferential direction and extends in the left-right direction and that is recessed in the outer diameter direction is formed on the inner circumferential wall surface of the small-diameter insertion hole 80. Three are formed.

  A frictional force applying member 50 and a connecting bolt 82, which will be described later, can be inserted into the cylindrical body, and a protruding strip 83 of the frictional force applying member 50 can be fitted into the support groove 81. It has become.

  Further, the outer sides of the notches 72, 72 in the cylindrical body, that is, the left and right ends of the extending member 46 are provided with insertion holes 113 that are connected in the left-right direction and into which connection bolts 82 to be described later are inserted. The pivot part 111 is pivotally attached to the part 112.

  Next, as shown in FIG. 6B, the guide member 47 includes a left piece guide member 47L and a right piece guide member 47R that are paired on the left and right. These two piece guide members 47L and 47R are gently curved along the main plate 44 in a side sectional view as shown in FIG. Further, on the opposing surfaces of the two guide members 47L and 47R, there are slit-shaped guide holes 84L and 84R that are endless at the upper end side and endlessly opened at the lower surfaces of the guide members 47L and 47R at the lower end side. Each piece guide member 47L, 47R is formed in an inward substantially U-shape in which the opening portions are opposed to each other in a top sectional view. These guide holes 84L and 84R can be inserted in the left and right sides of the extending member 46 (see FIGS. 9A, 9B and 13).

  And as shown in FIG.8 (c), the wavy groove part 68 which makes a wave shape in an up-down direction is formed in the inner wall surface of the front side of the guide holes 84L and 84R in a side sectional view. The hooking portion 71 of the hooking tool 69 is hooked to the wave portion of the wave-like groove portion 68. In addition, communication holes 85 and 85 communicating in the front-rear direction are provided at upper and lower end portions outside the guide members 47L and 47R so as to correspond to the screw holes 59 and 59 of the main plate 44, respectively.

  In the present embodiment, the outer wall surface on the front side of the guide members 47L and 47R is formed in a substantially flat shape that curves along the main plate 44, but the thickness of the outer wall on the front side of the guide member is vertical. The outer wall surface may be formed in the same wave shape as the inner wall surface so as to be uniform. Thereby, in the process which shape | molds a guide member with a synthetic resin etc., it can make it easy to remove a guide member from a formwork, and can improve the manufacturing efficiency of a headrest apparatus.

  Furthermore, the wavy groove 68 has a substantially sinusoidal shape so that when the seated person or the like adjusts the height of the headrest device 40, the seated person or the like is given a moderate feeling of moderation. As long as it is possible, for example, a substantially triangular wave shape or a substantially square wave shape may be used. Thereby, a sense of moderation can be given to a seated person or the like.

  Next, as shown in FIG. 7A, the inner fitting member 48 is formed of a rectangular cylindrical body having a slit-like lower opening 86 that communicates in the vertical direction and extends in the horizontal direction. A plate-shaped flange 87 extending in the left-right direction and bent at the left and right ends toward the inner side is provided at the lower portion of the rectangular cylindrical body. The rectangular cylindrical body is formed to have a height lower than the inner peripheral wall of the through hole portion 54 of the main plate 44 and is fitted into the through hole portion 54. Further, the flange portion 87 covers the lower surface of the main plate 44.

  Furthermore, a locking hole 88 communicated in the front-rear direction is provided in the central portion of the front and back wall surfaces of the rectangular cylindrical body so as to correspond to the left and right positions of the slit hole 62 of the extending member 46. ing. Further, a guide pin 63 described later can be locked in the locking hole 88.

  A plurality of linear protrusions 90 extending in the vertical direction are formed in the circumferential direction on the outer peripheral wall of the rectangular cylindrical body forming the inner fitting member 48. Accordingly, the strength of the lower opening 86 in the vertical direction and the front-rear direction is increased, so that even when a load such as the head of the seated person is brought into contact with the headrest body 41, the lower opening 86 86 is not deformed, and the guide pin 63 is prevented from being detached from the locking hole 88.

  Further, screw holes 89 and 89 communicating in the vertical direction are provided on both the left and right sides of the lower opening 86 of the rectangular cylindrical body. The screw holes 89 and 89 are used when the inner fitting member 48 is fixed to the main plate 44.

  Further, since the flange 87 of the rectangular cylindrical body covers the lower surface of the main plate 44, the inner fitting member 48 and the main plate 44 are displaced from each other after the inner fitting member 48 is attached to the main plate 44. It is prevented.

  Next, the member regarding the attachment part 42 is demonstrated. As shown in FIG. 3, the support member 49 including the attachment portion 42 is formed of a substantially trapezoidal body whose lower side width is gradually smaller than the upper side width in a front view. On both the left and right sides of the upper surface of the substantially trapezoidal body, as shown in FIG. 7 (b), cylindrical mounting cylinders 73, 73 having a cylindrical shape facing the left-right direction are formed in the notches 72, 72 of the extending member 46. It is provided at the corresponding position. The mounting cylindrical portions 73 and 73 are formed to be continuous with the cylindrical body of the extending member 46 so that the inner outer diameter gradually becomes larger than the outer outer diameter in the left-right direction. Is formed. The mounting cylindrical portions 73 and 73 are loosely fitted into the cutout portions 72 and 72.

  Further, the upper surface of the support member 49 between the mounting cylindrical portions 73 and 73 has a substantially arc-shaped upward surface continuously provided along the outer peripheral surface of the mounting cylindrical portion 73, and faces upward. Projecting surface portions 75 and 75 are formed. The projecting surface portions 75 and 75 are fitted into the wide concave portions 74 and 74 of the extending member 46 so that each upward surface can be in sliding contact with each inner surface of the wide concave portion 74.

  Further, on the upper surface of the support member 49 between the projecting surface portions 75, 75, a narrow projecting portion 78 projecting forward and upward and formed narrow in the left-right direction is connected to the notch recess 77 of the extending member 46. Correspondingly, a plurality (11 in this embodiment) are provided at a predetermined distance in the left-right direction.

  Further, as shown in FIG. 9C, a large-diameter insertion hole 92 and a small-diameter insertion hole 93 having coaxial lines with the mounting cylindrical portion 73 are formed on the inner peripheral surface of the mounting cylindrical portion 73. An attachment groove (not shown) that is recessed in the outer diameter direction and extends in the left-right direction is formed on the inner wall surface of the small-diameter insertion hole 93. A frictional force applying member 51 (to be described later) and a connecting bolt 82 can be inserted into the mounting cylindrical portion 73, and a protrusion 94 of the frictional force applying member 51 (to be described later) is provided in the mounting groove. It can be fitted.

  Furthermore, as shown in FIG. 7B, a convex fitting convex portion 95 is formed on the front side of the support member 49 so as to extend in the left-right direction and form a substantially trapezoidal shape and protrude forward. Yes. The convex fitting convex portion 95 is fitted into a concave fitting concave portion 13 provided at the upper back of the backrest frame 18. Further, the wall surface on the front side of the substantially trapezoidal body of the support member 49 is formed in accordance with the backrest frame 18 so as to be in close contact with the wall surface around the fitting recess 13 of the backrest frame 18 without a gap. . The fitting convex portion 95 is provided with an insertion hole 96 penetrating in the front-rear direction at a common position corresponding to the insertion hole 25 of the fitting concave portion 13 of the backrest 10.

  The fitting convex portion 95 and the front side wall surface of the substantially trapezoidal body constitute a mounting portion 42 as a fixing portion of the present invention, and the headrest device 40 is fixed to the backrest using the mounting portion 42. Further, on the back side of the support member 49, there is provided a concave fitting concave portion 97 having a substantially trapezoidal shape similar to the fitting concave portion 13 of the backrest 10 and being recessed forward (see FIG. 14).

  Next, as shown in FIG. 7C, the cover member 52 is formed of a horizontally long plate-like body that has a substantially semicircular arc shape so as to protrude forward. At the lower end of the plate-like body, a plurality of cutouts (11 in this embodiment) are formed that are spaced apart from each other by a predetermined distance so as to correspond to the narrow protrusion 78 of the mounting portion 42. ing.

  Moreover, as shown in FIG. 11, the engagement piece 98,98 which protrudes in the center direction of a circular arc by side sectional view and makes a pair is provided in the back side of a plate-shaped object. The distal end portions of these engagement pieces 98, 98 are formed in an arc shape so that the two distal end portions are combined to form a substantially C shape. By the pair of engagement pieces 98, 98, the cover member 52 can hold a connection bolt 82 described later.

  Next, the frictional force applying member 50 and the frictional force applying member 51 will be described with reference to FIG.

  As shown in FIG. 10A, the frictional force imparting member 51 is composed of a cylindrical body having a cylindrical cylindrical portion 99 extending in the left-right direction. A conical flange portion 100 having a tapered surface whose diameter gradually increases is provided. In addition, a protruding portion 94 that protrudes in the outer diameter direction is connected to a part of the outer peripheral surface of the cylindrical portion 99 from the conical flange portion 100. The cylindrical body is integrally formed of a hard synthetic resin (for example, polyacetal resin).

  Further, the frictional force imparting member 51 is not rotatable relative to the support member 49 by fitting the protruding portion 94 into the mounting concave groove formed in the mounting cylindrical portions 73 and 73 of the support member 49. Attached to.

  On the other hand, the frictional force imparting member 50 is composed of a cylindrical body having a cylindrical small-diameter cylindrical portion 101 having a long and small diameter extending in the left-right direction, and a short-diameter large-diameter flange 102 on one end side of the cylindrical body. Is provided. Further, as shown in FIG. 10B, three protruding pieces 82 that are spaced 120 degrees in the circumferential direction and project in the outer diameter direction are connected to the outer diameter surface of the small diameter cylindrical portion 101 from the large diameter flange portion 102. It is installed. Further, a tapered hole portion (not shown) having a tapered inner peripheral surface into which the conical flange portion 100 of the frictional force applying member 51 is fitted is formed on the inner end side of the small diameter cylindrical portion 101. . In this cylindrical body, the frictional force applying member 50 is integrally formed of a synthetic resin material (for example, polyurethane-based elastomer) that is softer and slightly elastic than the frictional force applying member 51.

  In addition, the frictional force applying member 50 is made non-rotatable relative to the extending member 46 by fitting the protruding piece 83 into the supporting concave groove 81 of the cylindrical body of the extending member 46. Yes.

  Next, the assembly procedure and operation of the headrest device 40 according to the present embodiment will be described with reference to FIGS. 4, 8, 9, and FIGS. 12 to 14.

  First, as shown in FIG. 4, the frictional force imparting member 51 is inserted into the mounting cylindrical portions 73 on both the left and right sides of the support member 49 from the inside. In addition, the frictional force applying member 50 is inserted from the inside on both the left and right sides through the opening 76 of the cylindrical body of the extending member 46. Then, the mounting cylindrical portion 73 of the support member 49 is fitted into the cutout portion 72 of the extending member 46.

  Thereafter, as shown in FIG. 9 (c), the connecting bolt 82 is inserted into the mounting cylindrical portion 73 from the side of the extending member 46 via the pivotal attachment portion 111, and is screwed into the hooked nut 103. Let Then, the outer peripheral surface of the conical flange portion 100 of the frictional force applying member 51 and the inner surface of the tapered hole portion of the frictional force applying member 50 are slidably contacted with each other (see FIG. 9C).

  As a result, the rotation shaft portion 112 having the connecting bolt 82 as the pivot portion in the left-right direction is formed on the upper portion of the fixing portion of the support member 49, and the extending member 46 is in the headrest body 41 with respect to the rotation shaft portion 112. And it becomes possible to turn at the pivot part. That is, as shown in FIG. 12A, the headrest main body 41 of the headrest device 40 can be rotated in the front-rear direction (arrow A direction) with the connecting bolt 82 as a pivot.

  Further, since the wide concave portion 74 of the extending member 46 and the protruding surface portion 75 of the support member 49 are fitted to each other, and the notched concave portion 77 and the narrow protruding portion are fitted to each other, the extending member 46 and the rotation shaft portion 112 are in a state in which the concave and convex portions are engaged with each other, and can be relatively rotated in the front-rear direction.

  Further, when the headrest body 41 is inclined forward by a predetermined angle with respect to the mounting portion 42, the front end of the wide recess 74 of the extending member 46 is brought into contact with the front end of the protruding surface portion 75 of the support member 49. On the other hand, when the headrest main body 41 is inclined backward by a predetermined angle, the rear end of the wide recess 74 comes into contact with the rear end of the protruding surface portion 75. That is, the range in which the headrest main body 41 can rotate with respect to the attachment portion 42 is limited to a predetermined angle in the front-rear direction. Thereby, the 1st stopper mechanism which controls rotation of the extending member 46 and the supporting member 49 is comprised.

  Further, when the headrest body 41 is inclined rearward by a predetermined angle, the notch recess 77 of the extending member 46 is formed on the narrow protrusion 78 of the support member 49 as shown in FIGS. The abutting member 46 is supported so that the extending member 46 is not inclined backward by a predetermined angle or more. Thereby, even when the headrest main body 41 strongly contacts the seated person's head, the extending member 46 is reliably supported at a predetermined inclination angle. Thereby, the 2nd stopper mechanism which controls rotation of the extending member 46 and the supporting member 49 is comprised.

  Next, as shown in FIG. 4, the extending member 46 is inserted into the lower opening 86 of the inner fitting member 48 from below. Then, the guide pin 63 is inserted into the locking hole 88 on the front side of the inner fitting member 48, and the guide pin 63 is inserted into the locking hole 88 on the back side through the slit hole 62 of the extending member 46. Is done. And the guide pin 63 is latched by the locking holes 88, 88 on the front side and the back side. The guide pin 63 is movable in the vertical direction in the slit hole 62, and the internal fitting member 48 is supported in the horizontal direction with respect to the extending member 46.

  As a result, when the headrest body 41 is moved in the vertical direction, the headrest body 41 is moved with the engagement between the slit hole 62 and the guide pin 63, and the extending member 46 and the headrest body 41 are moved in the left-right direction. Are supported accurately and reliably.

  Further, as shown in FIG. 12B, the inner fitting member 48 can move in the vertical direction (arrow B direction) with respect to the extending member 46. Since the movement range of the guide pin 63 is limited by the slit hole 62, the extended member 46 is prevented from coming out of the lower opening 86 of the inner fitting member 48.

  Moreover, since the positioning of the extending member 46 in the left-right direction with respect to the internal fitting member 48 is performed only by inserting the guide pin 63 into the slit hole 62, the assembly work of the headrest device 40 can be facilitated.

  In addition, the lower opening 86 of the inner fitting member 48 restricts the extension member 46 from moving in the front-rear direction and the left-right direction, so that the extension member 46 is guided in the up-down direction. The extending member 46 can be smoothly moved up and down. Furthermore, the lower end of the headrest body 41 is sealed by the internal fitting member 48, and entry of dust, dirt, etc. into the headrest body 41 is reliably prevented.

  Next, as shown in FIG. 13, the pair of left and right guide members 47 </ b> L and 47 </ b> R are screwed to the main plate 44. And the latching tools 69 and 69 are inserted from the back side into the communicating ports 67 and 67 of the left-right upper part of the extending member 46. FIG. Thereafter, the extending member 46 is inserted into the through hole portion 54 of the main plate 44 from below. Further, both side portions of the extending member 46 are inserted into the guide holes 84L and 84R of the left and right guide members 47L and 47R.

  As a result, the engaging portion 71 of the latching tool 69 is engaged with the corrugated portion of the corrugated groove 68 of the guide member 47 in the guide hole 84, and the extending member 46 is urged rearward by the latching tool 69 and guided. The extending member 46 is held in the guide hole 84 of the guide member 47 by being brought into contact with the inner wall of the hole 84. Further, when the headrest body 41 is pulled up or pushed down with respect to the mounting portion 42, the hook 69 is bent in the front-rear direction, so that the hook 71 and the wave groove 68 are not hooked. Therefore, the extending member 46 can move up and down with respect to the guide member 47.

  Therefore, as shown in FIG. 12, the headrest body 41 can move in the vertical direction (arrow B direction) with respect to the mounting portion 42, and the seated person can adjust the height of the headrest body 41 as appropriate. Even when the headrest body 41 is moved upward with respect to the attachment portion 42, a gap is formed because the plate-like portion of the extending member 46 exists between the headrest body 41 and the attachment portion 42. There is nothing. Therefore, the headrest body 41 is supported by the plate-like extending member 46 having a predetermined width as well as the chair 1 having the gorgeous headrest device 40, thereby preventing torsion and the like generated in the headrest body 41. It will be possible.

  Further, since the extending member 46 is urged rearward by the latch 69, the extending member 46 does not rattle in the front-rear direction in the guide hole 84, and the head of the seated person can be seen from the headrest body 41. Even when the extension member 46 is strongly abutted against the guide hole 47, the extension member 46 is held by the guide member 47 without coming out of the guide hole 84.

  As a result, the pair of left and right guide members 47 are guided in the vertical direction by the plate-like extending member 46 and can be moved. A pair of left and right guide members 47 are fixed to the main plate 44 that supports the cushion member 43, and the pair of left and right guide members 47 and the plate-like extension member 46 are supported while being supported accurately and reliably in the vertical direction. Since it is moved, the twist etc. which generate | occur | produce in the headrest main body 41 are prevented more reliably.

  Next, as shown in FIG. 4, the rectangular tubular body of the internal fitting member 48 is inserted from below into the through-hole portion 54 of the forward portion 53 of the main plate 44, and the flange portion 87 is screwed to the lower surface of the forward portion 53. Stopped. And the sheet-like member 104 which consists of a nonwoven fabric with favorable sliding property is arrange | positioned at the front side of the extending member 46. FIG. Thereafter, the cushion member 43 is pressed from the front side of the main plate 44 and the like, and the back cover member 45 is pressed to the back side of the main plate 44 so that the cushion member 43 is fitted into the back cover member 45.

  Even if the guide pin 63 locked in the locking hole 88 of the inner fitting member 48 is displaced in the front-rear direction by inserting the inner fitting member 48 into the through-hole portion 54 of the main plate 44, the guide pin 63. Is prevented from coming out of the locking hole 88 by being brought into contact with the inner peripheral wall surface of the through-hole portion 54.

  Finally, the cover member 52 is attached to the opening portion 76 so that the connection bolt 82 of the opening portion 76 of the extending member 46 is clamped by the engagement pieces 98, 98 of the cover member 52, and this embodiment The assembly of the headrest device 40 according to the above is completed. As described above, the cover member 52 is attached to the opening portion 76 and the rotating portions of the headrest body 41 and the attachment portion 42 are covered, so that the first and second stopper mechanisms are shielded. This reduces the risk of fingers or clothing such as being caught in the stopper mechanism.

  Next, as shown in FIG. 14, the attachment portion 42 of the support member 49 is fixed to the backrest frame 18 of the chair 1 from the back side. At that time, the fixing bolt 105 is inserted into the insertion hole 25 in a state where the fitting convex portion 95 of the support member 49 is fitted in the fitting concave portion 13 of the backrest 10, and the inner side of the backrest frame 18 is inserted. The nut 106 is fastened. Thereby, the backrest 10 of the chair 1 and the headrest main body 41 are couple | bonded using the supporting member 49 (refer FIG. 1 and FIG. 2).

  In addition, a thin plate-shaped decorative cap 107 formed in a shape matching the inner shape of the fitting recess 97 is fitted into the fitting recess 97 on the back side of the support member 49 of the headrest device 40, thereby forming a concave groove. Is covered (see FIG. 3B). The headrest device 40 of this embodiment includes a concave fitting recess 97 common to the fitting recess 13 of the backrest frame 18 on the back side of the support member 49. Thereby, as an optional member of the chair 1, for example, a fitting convex portion 109 or a fitting concave portion 110 having a shape common to the fitting convex portion 95 of the headrest device 40 is formed on the hanger device 108 as shown in FIG. Thus, an optional member can be further mounted on the back side of the headrest device 40, and the convenience of the seated person can be enhanced.

  As described above, the headrest device 40 is used for coupling the backrest 10 and the headrest main body 41, and provides a mounting portion 42 (fixed portion) that is fixed to the backrest 10 and a pivot portion in the left-right direction at the top of the mounting portion 42. A rotating shaft portion 112, and a plate member having a predetermined width extending at least in the internal space of the headrest body 41, and the headrest body 41 with respect to the rotating shaft portion 112. And an extending member 46 that rotates at the pivot portion, and around the rotation shaft portion 112 provided at the upper portion of the mounting portion 42 fixed to the backrest 10 of the support member 49, Since the extending member 46 rotates together with the headrest body 41, the attachment portion 42 and the rotation shaft portion 112 are provided close to each other. In addition, the headrest body 41 is supported with a predetermined width from the inside by the extending member 46, and the headrest body 41 caused by the headrest support can be prevented from being twisted. Further, since the extending member 46 having a plate shape can be accommodated in the internal space of the headrest body 41, the appearance is preferable.

  Further, the extending member 46 has pivoting portions 111 formed at least at both left and right ends of the extending member 46 pivotally connected to the rotation shaft portion 112 of the supporting member 49, and in the left-right direction with respect to the supporting member 49. Since the positioning means is provided, both left and right ends of the plate-like extending member 46 having a predetermined width in the left-right direction are pivotally attached to the rotation shaft portion 112 of the support member 49, so that the torsional force in the left-right direction is reduced. In contrast, the strength is ensured, and the headrest body 41 can be reliably prevented from being twisted. In addition, since the extending member 46 is provided with positioning means in the left-right direction with respect to the support member 49, the attaching operation of the extending member 46 to the support member 49 can be facilitated.

  The extending member 46 has a plurality of wide recesses 74 (recesses) and notch recesses 77 (recesses) in the front-rear direction on the inner side of the pivoting portion 111 as positioning means. 112 has a plurality of protruding surface portions 75 (convex portions) guided by the wide concave portions 74 of the extending member 46 and a plurality of narrow protrusion portions (convex portions) guided by the notched concave portions 77. Thus, in addition to facilitating the attachment work of the extending member 46 to the support member 49 by the positioning means, when the headrest body 41 is rotated and adjusted in the front-rear direction, the positioning means is used, Since the extending member 46 and the rotation shaft portion 112 are relatively rotated in the front-rear direction in a state where the protrusion and recess are fitted to each other, the strength is secured against the torsional force in the left-right direction, and the headrest body 41 is twisted. Reliably prevent It becomes possible way.

  Further, a stopper mechanism for restricting the rotation of the extending member 46 and the support member 49 is provided in a space sandwiched between the pivoting portions 111 formed at the left and right ends of the extending member 46, and the space is Since the stopper mechanism is shielded by the cover member 52 by being shielded by the cover member 52 (cover member), the risk of pinching fingers by the stopper mechanism can be reduced. Further, the rotating part can be effectively concealed by the cover member 52, and the design is improved.

  The extending member 46 is a plate-like member having a predetermined width extending at least into the internal space of the headrest main body 41, and the headrest main body 41 is movable in the vertical direction with respect to the plate-like extending member 46. Thus, even when the headrest body 41 is moved upward, a plate-like extending member 46 having a predetermined width is interposed between the headrest body 41 and the upper end portion of the backrest 10 of the chair 1. As a result, the gap between them is always closed. Therefore, since no gap is formed between the headrest body 41 and the upper end portion of the backrest 10 of the chair 1, not only the chair 1 provided with the headrest device 40 having a good appearance but also a plate-like extension having a predetermined width is provided. By supporting the headrest main body 41 with the member 46, the twist etc. which generate | occur | produce in the headrest main body 41 can be prevented.

  The headrest body 41 includes a cushion member 43 (pillow part) that elastically supports the head of the seated person, a main plate 44 that supports the cushion member 43, and a pair of left and right guide members 47 provided on the main plate 44. , And the pair of left and right guide members 47 are guided by the pair of left and right guide members 47 so as to be movable in the vertical direction. Is fixed, and the pair of left and right guide members 47 and the holding member 46 are relatively moved while being supported accurately and reliably in the vertical direction, so that twisting and the like occurring in the headrest body 41 can be prevented more reliably. .

  Further, the plate-shaped extending member 46 has a length in the vertical direction that is at least shorter than the vertical length of the main plate 44, and the deformation-allowable space V where the plate-shaped extending member 46 does not exist at the upper position of the headrest body 41. Since the plate-shaped extending member 46 is not located at the upper position of the headrest body 41 that supports the head of the seated person, a deformation-allowable space V can be secured, and this space V is used. Thus, the head of the seated person can be properly protected. In addition, by ensuring this space V, when the seated person applies a force to rotate the headrest body 41 to his / her optimum position, the hardness of the headrest body 41 is applied to the head of the seated person. The headrest device 40 can be used comfortably without making it feel.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the pair of left and right guide members 47L and 47R and the main plate 44 are configured as separate members. For example, the guide plate is formed by forming a pair of left and right guide holes on the left and right side portions of the main plate. You may comprise a member and a main plate as one member.

  In the above embodiment, the guide member 47 is composed of two guide members 47L and 47R, and the guide members 47L and 47R are provided with the guide holes 84L and 84R. The body may be used as a guide member, and the left and right end portions of the plate-like body may be folded back to the front side, and a gap generated in the folded portion may be used as a guide hole. That is, the guide member may be constituted by one member, and the guide hole may be formed endlessly in the vertical direction.

  In the above embodiment, the extending member 46 is mainly formed of a single plate and the left and right side portions are held by the guide member 47. However, the supporting member is held by a plurality of members, for example, the guide member. In addition to being divided into a two-piece holding member and an erection member constructed between the retention members, the erection member is formed into a thin sheet or formed of an elastic material that easily deforms in the front-rear direction. Also good.

  Moreover, in the said Example, the positioning means of the extending member 46 and the support member 49 is made into the uneven | corrugated | grooved part engaged with uneven | corrugated, and when the extending member 46 side is provided with the notch recessed part 77 and the notch part 72 as a recessed part. At the same time, the support member 49 is provided with the mounting cylindrical portion 73 and the narrow protrusion 78 as the convex portion. For example, the convex portion may be provided on the extending member side and the concave portion may be provided on the supporting member side. Good. Also, instead of positioning by concave-convex engagement, a hole is formed in one member and a pin or the like is locked, and a groove or a hole for receiving the pin or the like is provided in the other member, so that the extending member and the support member It is good also as a positioning means of the horizontal direction with.

DESCRIPTION OF SYMBOLS 1 Chair 10 Backrest 18 Backrest frame 40 Headrest apparatus 41 Headrest main body 42 Attachment part (fixed part)
43 Cushion material (pillow part)
44 Main plate 45 Back cover member 46 Extension member 47 Guide member 48 Internal fitting member 49 Support member 50 Friction force application member 51 Friction force application member 52 Cover member 62 Slit hole 63 Guide pin 72 Notch (positioning means)
73 Mounting cylindrical part 74 Wide recessed part 75 Projecting surface part 77 Notch recessed part (positioning means)
78 Narrow protrusion 95 Fitting protrusion 111 Pivoting part 112 Rotating shaft part

Claims (7)

In a chair provided with a headrest device that is rotatable about a pivot in the left-right direction with respect to the backrest,
The headrest device is used for coupling the backrest and the headrest body, and provides a fixed portion that is fixed to the backrest, and a pivot shaft that provides a left and right pivot portion on the top of the fixed portion and outside the backrest. And a plate having a predetermined width extending at least in the internal space of the headrest body, and pivoted at the pivot portion together with the headrest body with respect to the pivot shaft portion. And a extending member.   The extending member includes at least pivoting portions formed on the left and right ends of the extending member that are pivotally connected to the rotating shaft portion of the supporting member, and includes a left-right positioning means for the supporting member. The chair according to claim 1, wherein   A plurality of recesses are formed in the extension member in the front-rear direction on the inside of the pivoting portion as the positioning means, and the rotation shaft portion of the support member is guided by the recess of the extension member. The chair according to claim 2, wherein a plurality of convex portions are formed.   A stopper mechanism for restricting the rotation of the extension member and the support member is provided in a space sandwiched between pivoting portions formed at the left and right ends of the extension member, and the space is formed by a cover member. The chair according to claim 2 or 3, wherein the chair is shielded.   The extension member is a plate-like member having a predetermined width extending at least into the internal space of the headrest body, and the headrest body is movable in the vertical direction with respect to the plate-like extension member. The chair according to any one of claims 1 to 4, wherein the chair is provided.   The headrest body includes a pillow portion that elastically supports a head of a seated person, a main plate that supports the pillow portion, and a pair of left and right guide members provided on the main plate, and the pair of left and right guides 6. The chair according to claim 5, wherein the member is guided and moved in the vertical direction by the plate-like extending member.   The plate-shaped extending member has a vertical length that is at least shorter than the vertical length of the main plate, and a deformation-allowing space in which the plate-shaped extending member does not exist can be disposed at an upper position of the headrest body. The chair according to claim 6, which is configured as described above.

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