Reclining chair

Abstract

To provide a chair in which a headrest rotates frontward relative to a backrest, which provides an improved use feeling by reducing a displacement between the headrest and a head.SOLUTION: A head rest 4 includes a body 72 connected to the backrest 3 by right-left connection members 81, 82 in a vertically movable and front-rear rotatable manner. A lower connection member 82 includes an arc groove 85, and the headrest 4 rotates below the contact part (head point) which is in contact with a head of a user and rotates about a center 85a of a curvature radius of a side arc groove 85. Since the rotation center 85a is positioned near a neck of the user, the head point 125 which is a contact point with the head of the user does not change much when the headrest 4 rotates frontward. This configuration provides an excellent use feeling by preventing a displacement of the head rest 4 with respect to the head of the user.SELECTED DRAWING: Figure 15

Description

[Technical Field]

[0001] The present invention is Reclining It's about chairs. [Background technology]

[0002] In a chair, headrest Set up It is common to make the height and front-rear position of a headrest adjustable. For example, Patent Documents 1 and 2 disclose a configuration in which a headrest is attached to a support member so that the height is adjustable and the headrest can be rotated up and down. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-79474 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-57397 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Documents 1 and 2, the rotation fulcrum (rotation center) of the headrest is located behind the rear surface of the headrest. However, with this configuration, when the headrest is rotated, the point of contact between the user's head and the headrest moves up and down. Therefore, in order to maintain the optimum height, the height of the headrest must be changed, which results in the problem that adjusting the headrest is time-consuming.

[0005] Furthermore, in order to find the optimum position for the headrest, the headrest may be rotated while the head is placed against it. However, in this case, when the headrest is rotated while the head is placed against it, a phenomenon known as "head shift" occurs, in which the headrest shifts vertically relative to the head, which may cause discomfort to the user.

[0006] Furthermore, in reclining chairs with rearward tilting backrests, it has been proposed to rotate the headrest forward relative to the backrest in conjunction with the rearward tilting of the backrest. However, even in this case, if the rotation fulcrum of the headrest is located behind the rear surface of the headrest, the contact surface between the user's head and the headrest will move downward, causing a "head shift" phenomenon that could cause discomfort to the user.

[0007] The present invention has been made to improve this current situation. [Means for solving the problem]

[0008] The present invention has various configurations, typical examples of which are specified in each claim. Of these, the invention of claim 1 is a generic concept. , targeting reclining chairs, " It has a seat and a backrest, The backrest has a base portion attached to a tilting frame that tilts rearward against a spring means, and an upper portion that can tilt forward relative to the base portion, The base and upper portions have an appearance of being integral and continuous, and are configured so that the upper portion tilts forward relative to the base portion while the base portion tilts backward as a whole. " The structure is as follows.

[0009] The invention of claim 2 is a development example of claim 1, "The upper part of the backrest is provided with a head support body that supports the head of the seated person, The tilting fulcrum at the top of the backrest is located below the head point, which is the part where the occupant's head comes into contact with the head support body. The structure is as follows. where: Head support body When the front surface of the cushion body (for example, the front surface of the cushion body) is bulging forward in a side view, the apex of the front surface becomes the head point, which is the part that the user's head (occipital region) touches. Head support body If the front of the head is not bulging in side view, the head point is usually roughly midway between the top and bottom, but this may vary from person to person. Head support body Since your head may hit the bottom of the front of the chair, we assume that the head point may be at the bottom of the front. Head support body The center of rotation of Head support body It is advisable to place it below the bottom edge of the

[0010] Claim 3 The invention of claim 1 or 2In " The seat tilts backward while moving backward in conjunction with the backward tilting movement of the backrest. " The structure is as follows.

[0011] Claim 4 The invention is 2 In " The upper part of the backrest has a main body connected to the base of the backrest, and the head support body is attached to the main body in a height-adjustable manner. " The structure is as follows.

[0012]

[0013] Claim 5 is a claim Any of 1 to 4 This is an example of the expansion of " The upper and base portions of the backrest are recessed forward in a plan view, and the upper and base portions are allowed to tilt relative to each other while maintaining a continuous, integral state. " The structure is as follows.

[0014] Claim 6 The invention is 1~5 one of This is an example of the expansion of , " The rear surface of the upper portion of the backrest and the rear surface of the base portion are aligned in the same plane. " The following configuration is adopted.

[0015] The invention of claim 7 is also a development example of any of claims 1 to 5. , " The tilting fulcrum of the upper part of the backrest is located between the lower end of the upper part and the front and rear surfaces of the upper end of the base. " The structure is as follows. The invention of claim 8 is also a development example of any of claims 1 to 5, "The upper and base portions of the backrest each have a shell body made of synthetic resin and a cushion body placed in front of it, and the upper shell body and the base shell body are connected so as to be able to rotate relative to each other." The structure is as follows. The invention of claim 9 is also a development example of any of claims 1 to 5, " In the reclined state, the upper part of the backrest can be tilted backward relative to the base against the spring from a position tilted forward relative to the base. The structure is as follows. [Effects of the Invention]

[0016] In the present invention, The design unity between the upper part and base of the backrest is maintained even when the chair is reclined, thereby adding high commercial value to the chair. In the invention of claim 2, a head support body The center of rotation is below the head point Towards Because it is located Head support bodyWhen the seat is rotated forward, the head point, which is the contact point with the user's head (occipital region), can be prevented from moving downward or significantly suppressed. Head support body This can prevent or suppress the phenomenon of "head slippage" in which the head support body and the head support member slip relative to each other, thereby improving the comfort of use. In other words, it can improve the ability of the head support body to follow the user's head.

[0017] Claim 4 When the configuration of Head support body This unitization improves assembly ease.

[0018] Claim In the case of 7, the connecting part between the upper part of the backrest and the base part is arranged inside the thick part of the backrest, and the head support body The center of rotation can be easily moved to the user's neck. Me, head This is preferable because it can reliably prevent the slippage phenomenon.

[0019] The backrest is often recessed forward in plan view to ensure a good fit to the body. 5 When the configuration of The backrest is both top and base Concave forward in plan view Therefore, the head support body This has the advantage of ensuring a unified design between the seat and the backrest. As in the embodiment, the head support body (upper part of the backrest) Supported at two points on the left and right Then It also has excellent stability.

[0020] Now, The top of the backrest The backrest is supported by hinges and horizontal pins. The base of It is also possible to connect it to, but in this case, the center of rotation is seated person Because it is located far behind the neck, the top of the backrest By rotating forward, Head support body (upper part of backrest) may be bowed and slip off the user's head.

[0021] In contrast, Embodiment As shown in the figure, the guide means is formed on the arc-shaped guide portion, and the center of the curvature radius is Head support body When set as the center of rotation, Head support body Since the robot rotates forward while rising, Head support bodyThis has the advantage that the movement of the head can be reliably made to follow the movement of the user's head, thereby accurately preventing the phenomenon of head slippage.

[0022] back leaning The top and base To enhance the unity of The top and base While overlapping, relative Rotation It must be configured to When the shell bodies are connected as shown in 8, the upper and base parts Ensures overlapping and improves aesthetics do. [Brief explanation of the drawings]

[0023] [Figure 1] 1A and 1B are diagrams showing the appearance of an embodiment, in which (A) is a perspective view seen from the front, (B) is a side view, and (C) is a perspective view seen from the rear. [Figure 2] (A) and (B) are perspective views with some components separated, and (B) is a perspective view showing the framework. [Figure 3] (A) is an entire separated perspective view, (B) is a separated perspective view of the seat outer shell, (C) is a partially enlarged view of the seat outer shell, and (D) is a separated perspective view of the wire cable and holder. [Figure 4] 1A is a perspective view of the base shell body and the tilting frame separated from each other, and FIG. 1B is a perspective view of the tilting frame. [Figure 5] (A) is an exploded perspective view of the entire back section, and (B) is an exploded perspective view of the base shell body. [Figure 6] FIG. 2 is a perspective view of a base shell body. [Figure 7] (A) and (B) are exploded perspective views of the upper part of the backrest, and (C) is an exploded perspective view showing the nut holding structure. [Figure 8] (A) is an exploded perspective view of the upper part of the backrest, (B) is a perspective view of the upper shell body seen from behind, and (C) is an enlarged perspective view of the rectangular recess that holds the slide block. [Figure 9] 1A is a perspective view showing the upper part of the backrest and the middle shell body as viewed from the front, and FIG. 1B is a perspective view showing the upper part of the backrest and the middle shell body as viewed from the rear. [Figure 10]FIG. 2 is a separated perspective view of the upper shell body and the middle shell body as seen from the rear. [Figure 11] FIG. 2 is a front perspective view of an upper shell body and a middle shell body separated from each other. [Figure 12] FIG. 1A is a perspective view of the interlocking means and the middle shell body separated from each other, and FIGS. 1B to 1D are perspective views of the connecting member. [Figure 13] 13 is a cross-sectional view taken along line XIII-XIII in FIG. 6. [Figure 14] FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. 7(B). [Figure 15] FIG. 7 is a cross-sectional view taken along the XV-XV direction in FIG. 6. [Figure 16] (A) is a plan view of the backrest, (B) is a bottom view of the upper part of the backrest, (C) is a schematic diagram for explaining the movement of the embodiment, and (D) is a schematic diagram showing the movement of the comparative example. [Figure 17] 10A is a schematic side view showing the mechanism by which the wire loosens, and FIG. 10B is a cross-sectional side view showing the movement of the connecting member when the wire is loosened. DETAILED DESCRIPTION OF THE INVENTION

[0024] Next, an embodiment of the present invention will be described with reference to the drawings. In this application, the terms "front, back, left, right" and "right" are used to specify directions, but these are based on the state seen from a person normally sitting in a chair. Front view direction is the direction facing the seated person.

[0025] (1) Chair overview First, an outline of the chair will be described mainly with reference to FIGS. 1 to 5. As shown in FIG. 1, the chair has, as its main elements, a leg assembly 1, a seat 2, and a backrest 3. The backrest 3 is composed of a base 3a and an upper part 3b. Backrest 3 Head support body at top 3b 4 is placed (Hereinafter, the "base 3a of the backrest 3" will be abbreviated as the "backrest base 3a", and the "upper part 3b of the backrest 3" will be abbreviated as the "upper part 3b of the backrest") . The chair of this embodiment is also equipped with armrests 5 as standard. The leg device 1 has leg supports 6 made of gas cylinders and branches extending radially, with casters attached to the tip of each branch. A roughly box-shaped base 7 that opens upward is fixed to the upper end of the leg supports 6.

[0026] As shown in Figure 3(B), a front block 8 made of resin or aluminum die-cast is bolted to the front end of the base 7, and a pair of left and right front links 9 are attached to the front block 8 via front shafts so that they can tilt rearward. In the neutral state where no one is seated, the front links 9 are tilted slightly rearward relative to the vertical line in a side view.

[0027] 3(B), forward-facing arm portions 11 of a tilting frame 10 are disposed on both the left and right sides of the base 7, and the tips of the forward-facing arm portions 11 are connected to the base 7 by hollow shafts 11a so as to be able to tilt rearward. In addition, left and right support portions 12 are provided at the rear of the tilting frame 10, and the backrest 3 and armrests 5 are attached to the support portions 12. As described above, the front end of the forward arm 11 that constitutes the tilting frame 10 is connected to the base 7 via the left-right longitudinal hollow shaft, and therefore the backrest 3 tilts rearward around the front end of the tilting frame 10. A torsion bar (not shown), which is an example of spring means, is built into the hollow shaft, and the tilting frame 10 tilts rearward against the elasticity of the torsion bar.

[0028] For example, as shown in Figure 4, in a tilting frame 10, lower stays 13 and upper stays 14, which are gently curved so as to bulge backward (concave forward) in plan view, are integrally connected to the left and right support columns 12, and the left and right support columns 12 and the upper and lower stays 13, 14 form the base of the tilting frame 10, with separate forward arms 11 fixed to both left and right ends of the base. Naturally, it is possible to form the forward arms 11 integrally with the base. The base and forward arms 11 of the tilting frame 10 are each aluminum die-cast products, but resin products can also be used.

[0029] As shown in Figure 3(A), the seat 2 has a structure in which a cushion body 16 is stretched over a resin seat plate (seat inner shell) 15, and the seat plate 15 is fixed to a seat support shell 17 arranged below it. A pair of left and right front bearing portions 17a are provided on the front underside of the seat support shell 17, and the upper ends of the front links 9 are connected to the front bearing portions 17a by front pins 18. Meanwhile, a pair of left and right rear bearing portions 19, 20 are provided on the rear underside of the seat support shell 17, and the upper ends of rear links 21 protruding from the forward arm portions 11 of the tilting frame 10 are connected to the rear bearing portions 19, 20 by rear pins 22. Therefore, when the backrest 3 tilts backward, the seat 2 moves backward and tilts backward together.

[0030] As shown in FIG. 3, an auxiliary link 23 is provided to protrude downward from the inner rear bearing portion 20 of the pair of left and right rear bearing portions 19, 20. Upper backrest 3b One end of a wire cable 24 is engaged as interlocking means for operating the auxiliary link 23. To be precise, the wire cable 24 has a structure in which a wire 26 is slidably inserted into a flexible tube 25, and a lower engaging tool 27 provided at one end of the tube 25 is held to the arm portion 11 by a holder 35, while a lower ball 28 provided at one end of the wire 26 is engaged with the lower end of the auxiliary link 23.

[0031] Therefore, at the lower end of the auxiliary link 23, a ball insertion hole 29 opens inward to the left and right, and a wire insertion groove 30 that communicates with the ball insertion hole 29 opens backward. The holder 35 is fixed to the forward arm portion 11 of the tilting frame 10 with a screw 31.

[0032] As shown in FIG. 3(D), the holder 35 is U-shaped when viewed from the front so that the lower fastening device 27 of the wire cable 24 can be partially fitted into it. The holder 35 opens toward the inner surface of the forward arm portion 11, and a rib 32 formed inside the holder 35 fits into the annular groove 33 of the lower fastening device 27, thereby holding the lower fastening device 27 immovable in any direction relative to the forward arm portion 11 of the tilting frame 10.

[0033] When the tilting frame 10 tilts backward and the backrest 3 reclines, the seat support shell 17 and the seat 2 move backward relative to the tilting frame 10, and the wire 26 of the wire cable 24 becomes loose during reclining. This point will be explained with reference to Figure 17(A).

[0034] The tilting frame 10 rotates around the axis of the hollow shaft 11a as a fulcrum, but because the seat support shell 17 is connected to the rear link 21 by the rear pin 22, the rear pin 22 rotates downward around the center of the hollow shaft 11a as a fulcrum. The holder 35 also rotates downward (descends) together with the forward arm portion 11.

[0035] On the other hand, since the front end of the seat support shell 17 is connected by a front pin 18 to the rear link 9 which is rotatably connected to the base 7, the front link 9 is pulled and tilts backward, but since it is located behind the rotation fulcrum O1 of the rear pin 22 and the forward arm section 11, and the span from the rear pin 22 to the rotation axis of the front link 9 is longer than the span from the rear pin 22 to the rotation axis of the forward arm section 11, the rotation angle of the front link 9 is smaller than the rotation angle of the forward arm section 11, and therefore the amount of descent of the front pin 18 is less than the amount of descent of the rear pin 22, and therefore the seat support shell 17 (and seat 2) moves downward while moving backward and tilting backward relative to the forward arm section 11 (tilting frame 10).

[0036] In this way, as the seat receiving shell 17 moves backward relative to the forward arm portion 11, the distance between the lower end of the auxiliary link 23 and the holder 35 decreases from L1 to L2. This causes a slack of the dimension (L1-L2) in the wire 26. Utilizing this slack, When reclining, the upper part of the backrest 3b (head support body 4) is against forward tilt (Forward movement) This point will be explained in more detail later.

[0037] Although not shown, a wedge member (placed inside the space surrounded by the base 7 and the front block 8) that adjusts the elastic resistance during reclining is fitted onto the hollow shaft 11a to which the front link 9 is attached, and by rotating a handle 34 (see FIGS. 3A and 3B) provided at one end of the front shaft, the aforementioned torsion bar is adjusted. initial The resistance to reclining can be adjusted by changing the elastic force.

[0038] As shown in Figure 5, Backrest base 3a is made of synthetic resin Lower row Shell body 36 and middle row and a shell body 37. base The device has a shell body 38, as shown in FIG. base Front of shell body 38 At the base A cushion body 39 is provided. base Shell body 38 and base The entire cushion body 39 is covered with a bag-shaped covering material (not shown). base Although the ribs, holes, recesses, etc. formed on the shell body 38 are shown in the drawing, in reality, these are covered with a skin material and are not exposed.

[0039] As shown in Fig. 2, a lumbar pad 40 is arranged so as to be able to slide up and down on the front surface of the lower shell body 36. Meanwhile, as clearly shown in Fig. 4, a slide lever 42 having a knob 42a exposed downward is attached so as to be able to move left and right in a groove frame portion 41 provided on the upper stay 14 constituting the tilting frame 10, and the slide lever 42 and the lumbar pad 40 are connected by an elastic wire 43 such as spring steel. Therefore, when the slide lever 42 is moved left and right, the lumbar pad 40 moves up and down.

[0040] In this embodiment, base The shell body 38 is made of upper and lower shells. body Although it is configured with 36 and 37, the whole can also be configured as one unit.

[0041] (2) Backrest Next, referring to the previous figures and the following figures, backrest 3 (3a, 3b) and Head support body 4 First, the backrest 3 will be described.

[0042] Regarding backrest base 3a , as already mentioned base The shell body 38 is made up of upper and lower shells. body 36, 37, as shown in Figure 2. base The shell body 38 has a generally trapezoidal shape with a width gradually increasing from bottom to top. As can be seen from FIG. 5(B), middle row The lower part 37a of the shell body 37 Lower row It overlaps the upper part 36a of the shell body 36 from behind. Lower row The shell body 36 is formed with a rear step portion 36b, middle row The shell body 37 is formed with a front portion 37b.

[0043] and, middle row A plurality of positioning protrusions 44a are provided at the lower end of the shell body 37. Lower row The rear step 36b of the shell body 36 is formed with a positioning hole 44b into which the positioning protrusion 44a fits. Middle shell 37 and Lower rowThe overlapping parts of the shell body 36 are fixed with multiple screws on the left and right. The screws are inserted from the back, Lower row It is screwed into a nut 45 disposed on the front surface of the shell body 36 .

[0044] For example, as shown in Figure 5, Lower row The lower part of the shell body 36 protrudes forward, and as shown in Figure 4, for example, a dovetail-shaped female rail section 46 that opens downward is formed at the front end of the left and right protruding sections, while a dovetail-shaped male rail section 47 into which the female rail section 46 fits from above is integrally formed on the rear surface of the support section 12 of the tilting frame 10, and the male rail section 47 is fitted into the female rail section 46 from above. Lower row The shell body 36 is fastened to the upper stay 14 of the tilting frame 10 with a plurality of bolts.

[0045] As shown in Figure 4(A), the support post 12 has a hollow structure that opens upward, and a cylindrical receiving member (not shown) with a bottom is fitted inside it. The receiving member is fixed to the support post 12 by screwing a forward-facing bolt from behind into a tapped hole formed in the receiving member that opens toward the rear. The armrest 5 has a main body with a boss that fits into the receiving member, and a pad attached to the top surface of the main body, and the main body is fixed to the receiving member by a bolt inserted from above.

[0046] The upper stay 14 of the tilting frame 10 has the above-mentioned groove frame portion 41 and positioning rib 48 protruding from the upper surface thereof. Lower row A long groove 49 is formed on the underside of the shell body 36 to fit over the groove frame portion 41 and the positioning rib 48. The lower shell body 36 is firmly fixed to the upper stay 14 of the tilting frame 10 with bolts.

[0047] (3) Lumbar support device and wire cable routing structure As can be seen from Figure 4(A), a long hole 50 is formed in the upper bottom of the long groove 49, into which the connecting part 42b protruding upward from the slide lever 42 slides freely, and one end of the elastic wire 43 is engaged with the connecting part 42a (in Figure 4(B), the elastic wire 43 is shown separated from the connecting part 42a).

[0048] For example, as shown in Figure 6, Lower row At the lower end of the shell body 36, a bottom plate 51 positioned at the lowest level and extending in the left-right direction and a shelf-like plate 52 positioned above it are formed, and the connecting portion 42a of the slide lever 42 is exposed in a lower horizontally elongated space 53 surrounded by the bottom plate 51 and the shelf-like plate 52. Lower row A center guide groove 55 sandwiched between left and right center ribs 54 is formed in the left-right intermediate portion of the shell body 36, and a rearward-facing, U-shaped center guide 56 is attached to the center guide groove 55, and the elastic wire 43 is arranged inside the center guide 56.

[0049] 2(B), a guide rail portion 58 is formed on the rear surface of the lumbar pad 40 in a U-shape with an opening facing backward, and is elongated in the up and down direction. This guide rail portion 58 is fitted into a center guide groove 55 shown in FIG. 6 so as to be freely slidable up and down, and the upper end of the elastic wire 43 is engaged with the upper end of the guide rail portion 58. Therefore, when the slide lever 42 is moved left and right, the lumbar pad 40 moves up and down due to the pushing and pulling action of the elastic wire 43.

[0050] Lower row The shell body 36 is formed with curved guide grooves 59 that guide the sliding of the elastic wire 43, and are formed in a state where they are bitten into the shelf-like plate 52. Also, as shown in FIG. 2(B), side guide pieces 60 are provided on both the left and right ends of the lumbar pad 40, and as shown in FIG. Lower row The shell body 36 is formed with a side guide 61 into which the side guide piece 60 is fitted so as to be immovable forward but movable up and down.

[0051] base Constituting the shell body 38 Lower rowThe shell body 36 is formed with a bottom plate 51 and a shelf-like plate 52 as part of the horizontal ribs, and the upper and lower shell bodies 36, 37 are also formed with multiple first ribs 62 extending left and right as part of the horizontal ribs. The center rib 54 is also formed as part of the vertical ribs, and multiple second ribs 63 extending up and down are also formed as part of the vertical ribs. These multiple vertical and horizontal ribs base The shell body 38 has a sturdy structure.

[0052] 6, forward-facing notches 64 are formed in the first rib 62 and the second rib 63 at two locations near the left and right ends of the upper and lower shell bodies 36, 37, thereby forming a wire passage for arranging the wire cable 24. Therefore, the wire cable 24 is arranged away from the cushion body 39, and the weight of a seated person does not act on the wire cable 24. The wire passage is arranged so as not to be impacted by the ramp pad 40. Lower row The lower part of the shell body 36 is formed on the outside of a ramp pad 40 .

[0053] As shown in FIG. 6, the wire cable 24 passes through base A hook 64a that prevents the wire cable 24 from moving forward is formed approximately in the middle of the top and bottom of the shell body 38. When the wire cable 24 is pushed in, the hook 64a first elastically deforms and then returns to its original shape, thereby embracing the wire cable 24 with the hook 64a.

[0054] 6, a holding groove 68 is formed in the first rib 62 located at the upper end to mount an upper locking device 67 provided at the other end of the wire cable 24 so that it cannot move up and down. That is, the annular groove 33 of the upper locking device 67 fits into the inner peripheral edge of the holding groove 68, thereby holding the upper locking device 57 so that it cannot move up and down.

[0055] As shown in Figure 6, Lower rowA lower cutout 65 for drawing the wire cable 24 into the lower horizontally elongated space 53 is formed in the left-right intermediate portion of the bottom plate 51 of the shell body 36. Side passages 66 communicating with the spaces above and below the shelf plate 52 are formed on the sides of both left and right ends of the shelf plate 52. The lower cutouts 65 may be formed in multiple locations spaced apart in the left-right direction.

[0056] As shown in Figure 4(B), the lower stay 13 of the tilting frame 10 has an inverted L-shaped cross section, and by arranging a center cover 69 and a side cover 70 on the underside thereof, a horizontally elongated recess that opens forward is formed in the lower stay 13, and the wire cable 24 is partially laid in the horizontally elongated recess. The wire cable 24 is pulled out upward from the horizontally elongated recess. base It is retracted into the shell body 38. The center cover 69 is fixed to the lower stay 13 with screws 71, and the side covers 70 are engaged with the lower stay 13 and are held down by the center cover 69.

[0057] (4). Upper backrest and head support Basic structure and swing mechanism As mentioned above, Backrest base 3a The shape of the trapezoid is such that the width of the left and right decreases upward. For example, as shown in Figure 1, The upper backrest 3b is connected to the base backrest 3a. The left and right width of the As a result, the rear surface of the backrest upper portion 3b and the rear surface of the backrest base portion 3a are aligned. Therefore, the design is such that the backrest is 3 teeth It has a high degree of unity.

[0058] And as shown in Figure 5, The upper backrest 3b is located in the middle of the base backrest 3a. The shell body 37 is connected to the housing 34 so as to be rotatable forward and backward. The head support body 4 has an upper shell body 72. A movable plate 73 is arranged in front of the movable plate 72 so as to be movable up and down, and a cushion body 74 is stretched on the front of the movable plate 73. The upper part of the backrest 3b is an upper shell body Back cover 7 that covers 72 from behind 5 The rear cover 75 is attached by snap engagement using engaging claws. Upper shell body It is attached to the 72. middle row A top cap 76 is placed on the top surface of the shell body 37 .

[0059] In this embodiment, Upper shell body 72, the movable plate 73, the cushion body 39 and the rear cover 45 , the movable body relative to the backrest base 3a The headrest device is configured together with the other members.

[0060] The movable plate 73 and the cushion body 74 support the user's head. Lifting type Head support body 4 If the head support is not a lift-up type, 4 The cushion body 74 as Upper shell body Alternatively, the movable plate 73 may be disposed in front of the cushion body 74. In this case, the movable plate 73 may be omitted. Also, the body pressure support may be configured with something other than the cushion body 74. For example, a structure in which a mesh material is stretched over a frame-shaped support or the like as the body pressure support may be adopted. Therefore, the movable plate 73 is an example of a support body, and the cushion body 74 is an example of a body pressure support body. 4 It may consist of a support and a body pressure support, or it may consist of only a body pressure support.

[0061] In this embodiment, a head support body is formed by a movable plate 73 and a cushion body 74. 4 Since it is a lift-up type, the head support body, which is the lift-up part, 4 and the non-lifting part Upper shell body The cover 72 and the rear cover 75 are covered with different skin materials. Upper shell body The front surface of the movable plate 72 is covered with a covering material in the portion that is exposed when the movable plate 73 moves up and down. Regarding the movable plate 73 and the cushion body 74, only the cushion body 74 may be covered with a covering material, or both may be covered with a covering material together. In either case, since they move up and down as a unit, the head support body is formed by the two. 4 If it is not a lift-up type, Upper shell body 72 and head support body 4 The cushion body 74 may be integrally covered with a skin material.

[0062] As shown in Figure 9, middle row A positioning protrusion 78 is provided on the top surface of the shell body 37, while a downwardly opening long groove 79 is formed in the top cap 76 to fit onto the positioning protrusion 78. As shown in FIG. 10, the top cap 76 is fitted with a plurality of screws 80. middle row The backrest 3 is fixed to the shell body 37. The backrest 3 is gently curved so that it is concave toward the front (bulges toward the rear) in a plan view. Head support body Like the backrest 3, the backrest 4 is also gently curved so that it is concave toward the front when viewed from above.

[0063] The top cap 76 is an example of a top member as claimed, and as can be clearly seen from Fig. 11, when viewed from the front, the top surface is gently curved so that it becomes lower on both the left and right sides, and when viewed from the side, it is gently tapered so that the front-to-back width becomes smaller toward the top. middle row The positioning projection 78 of the shell body 37 also has a curved upper surface so that both the left and right sides are lower when viewed from the front, and tapers upward when viewed from the side (see also FIG. 14).

[0064] For example, as can be seen from Figure 5, middle row The upper surface of the shell body 37 is slightly curved so as to bulge upward when viewed from the front, head support The lower surface of the main body 32 of the body 4 is slightly curved so as to be concave upward when viewed from the front.

[0065] next, Upper backrest 3b (head support 4) For example, as shown in Figures 11 and 12, Upper shell body 72, two parts near the left and right ends are connected by upper and lower connecting members 81, 82 so that they can rotate back and forth. middle row It is attached to the shell body 37.

[0066] 11 and 15, the upper connecting member 81 has a generally upper half portion that is a vertically elongated plate-like portion 81a, and a generally lower half portion that is a circular arc boss portion 81b that is recessed forward in side view. The plate-like portion 81a is Upper shell bodyThe hole 83 is formed in the bottom of the casing 72, and is inserted into the recess 83 from below, and is fastened by two screws 84 (see Figure 15). Upper shell body It is fixed at 72.

[0067] 12 and 15, the lower connecting member 82 has a holder portion 82a having a side arcuate groove (main arcuate groove) 85 into which the arcuate boss portion 81b of the upper connecting member 81 fits laterally, and a plate-like portion 82b protruding downward from the holder portion 82a. middle row The shell body 37 is fitted into a recess 86 formed in the shell body 37 and fastened by a screw 87. middle row It is fixed to the shell body 37.

[0068] 12 and 15, a bushing 88 made of resin with a small coefficient of friction is interposed between the arc portion 81b of the upper connecting member 81 and the holder portion 82a of the lower connecting member 82. In this embodiment, the upper connecting member 81 slides up and down relative to the lower connecting member 82, Upper shell body 72 moves up and tilts forward relative to the backrest 3. Therefore, the arc boss portion 81b and the side arc groove 85 Is, Ga An arc-shaped guide portion is configured as an example of a guide means.

[0069] As shown in FIG. 15, the arc boss portion 81b and the side arc groove 85 of the connecting members 81 and 82 are connected to the main body 32. middle row The center 85a of the curvature radius of the side arc groove 85 of the lower connecting member 82 is Upper backrest 3b (head support 4) The rotation center 85a is located in front of the arc boss portion 81b and arc groove 85, which are the guide means.

[0070] As shown in FIG. 15 and FIG. 17(B), the rotation center 85a is located at the connecting members 81 and 82. Upper shell body 72, while being located near the front end of the lower end of Upper shell body Since 72 is curved, as shown in Figure 16(A)(B), Upper row Shell body 72 (or Head support body4) In the left and right intermediate portion, the rotation center 85a is Upper row The lower end of the shell body 72 extends forward by a large amount beyond the front end (located around the back of the user's neck). Head support body 4 (and upper backrest 3b) The rotation center 85a is set to be located at the neck of the user.

[0071] For example, as shown in FIG. 13, in this embodiment, Head support body 4 Since the cushion body 74 bulges forward in side view (and plan view), the user's head hits the apex of the cushion body 74 that is located most forward in side view or at a height position near that. Therefore, in this embodiment, the apex of the cushion body 74 that is located in the middle of the left and right and protrudes forward becomes the head point 125. As shown in FIG. 15, Head support body Since the rotation center 85 a of the cushion body 74 is located below the cushion body 74 , the rotation center 85 a is necessarily located below the head point 125 .

[0072] As shown in Figure 12(C), the upper connecting member 81 is formed with a ball holding hole 90 into which the upper ball 89 of the wire cable 24 is fitted from above, and a wire insertion groove 91 through which the upper end of the wire 26 passes, both of which are in communication with each other. As described with reference to Figure 6, the upper locking device 67 of the wire cable 24 is middle row Since the wire 26 is fitted into the holder groove 68 of the shell body 37, Upper backrest 3b is held in a fully rotated rearward position, and when the wire 26 is loosened, Upper backrest 3b The spring 100 pushes the lever 102 upward and rotates it forward.

[0073] in this case, Head support body 4 When it rises, the main body 32 and Middle shell 13 to 15, the main body 32 is fitted into the top cap 76, so the gap is not noticeable. Also, the top cap 76 is tapered upward when viewed from the side and curved so that both the left and right sides are lower when viewed from the front. Upper shell 72 When rotating back and forth Upper shell 72There is no twisting between the top cap 76 and the Upper shell 72 can be rotated smoothly.

[0074] When the wire cable 24 is used as the interlocking means, the upper ball 89 Upper shell 72 However, when the upper connecting member 81 is engaged as in the embodiment, there is an advantage that the structure can be simplified.

[0075] (5). Head support body biasing structure As shown in FIGS. 11 to 13, a relief hole 92 is formed in the middle of the left and right of the top cap 76, and a fixed guide body 93 is fitted into the relief hole 92 from above with a screw 94. middle row The fixed guide body 93 is fixed to the positioning protrusion 78 of the shell body 37. As shown in FIG. 12(A), the fixed guide body 93 has left and right side plates 93a, and a center arc groove 95 is formed on the inner surface of the left and right side plates 93a. The center arc groove 95 also forms part of the arc-shaped guide portion. The center of the radius of curvature of the center arc groove 95 coincides with the center 85a of the radius of curvature of the side arc groove 85 formed in the lower connecting member 82.

[0076] A movable guide body 96 having left and right side plates 96a is disposed inside the fixed guide body 93, and a guide shaft 97 is provided protruding laterally from the left and right side plates 96a, and is slidably fitted into a central arc groove 95 of the fixed guide body 93. As shown in FIG. 13, the upper end of the movable guide body 96 is secured by a screw 98. Upper shell body The movable guide body 96 is fixed to the main body 72. A screw 98 is inserted into the movable guide body 96 from the rear and is screwed into a nut 99 disposed on the front side of the main body 72.

[0077] As shown in FIG. 13, the movable guide body 96 is biased upward by a spring (compression coil spring) 100. middle rowA spring receiving recess 101 (see also FIG. 12(A)) into which the spring 100 fits is formed on the upper surface of the shell body 37. A receiving tray 102 that holds the upper end of the spring 100 so that it does not shift sideways is placed on the lower surface of the movable guide body 96, and round bar-shaped guide shafts 103 that fit slidably into the center arc groove 95 of the fixed guide body 93 are formed on both left and right ends of the receiving tray 102.

[0078] The guide shaft 97 of the movable guide body 96 and the guide shaft 103 of the tray 102 are rod-shaped, so the movable guide body 96 and the tray 102 can move up and down while being guided by the center arc groove 95 of the fixed guide body 93, while changing their positions by rotating around the axes of the guide shafts 96, 103. Upper shell body 72 is guided by upper and lower connecting members 81 and 82 and is allowed to rotate back and forth.

[0079] In this embodiment, in the non-reclining state, the upper connecting member 81 is pulled downward by the wire 26, Upper shell body 72 (head support The seat body 4 is held in a state of being rotated backward against the spring 100. As already explained, in the reclining state, the seat support shell 17 moves backward relative to the tilting frame 10, and the wire 26 is loosened. Upper backrest 3b with head support 4 The spring 100 causes the lever 104 to rotate forward.

[0080] That is, as shown in FIG. 17(B), the wire 26 of the wire 24 is loosened by (L1-L2) at the lower part. Upper shell body 72 is pushed by the spring 100 and moves upward by (L1-L2), but since the side arc groove 85 of the lower connecting member 82 is recessed forward in side view, The upper backrest 3b (head support body 4) is connected to the base backrest 3a. It rotates (moves forward) relative to the In this embodiment, the upper backrest portion 3b and the head support body 4 are tilted forward by being pushed by the spring 100, so that even in the reclined position, the upper backrest portion 3b and the head support body 4 can be tilted backward relative to the backrest base portion 3a against the force of the spring 100.

[0081] In an embodiment, the backrest base 3a A little before the Upper backrest 3bIn other words, the wire 26 is set to be fully loosened at the end of the backward tilt of the backrest 3. Therefore, the backward tilt of the backrest 3 is not hindered by the wire 26.

[0082] (6) Movable plate lifting mechanism Next, the mechanism for raising and lowering the movable plate 73 will be described. For example, as shown in Figures 7 and 8(A), a slide block 106, which is T-shaped in a side view, overlaps the rear of the movable plate 73 at approximately the middle height in the vertical direction near both the left and right ends. The front end of the slide block 106 fits into a rectangular recess 107 formed in the rear surface of the movable plate 73, while the rear end of the slide block 106 is inserted into a vertically elongated side guide groove 108 formed in the main body 72, and a cover member 109 shown in Figure 8(B) is fixed to the rear surface of the slide block 106 with screws 110.

[0083] A nut holding portion 112 into which a T-nut 111 fits non-rotatably is protruded from the movable plate 73 on the front side of the rectangular recess 107, and a screw 110 is screwed into the T-nut 111 to fasten the cover member 109 and the slide block 106 together to the movable plate 73. As shown in Figure 8(C) , left and right anti-vibration protrusions 113 are provided on the left and right side edges of the rectangular recess 107 to improve the posture retention of the slide block 106.

[0084] 7 and 8, a rod 114 extending longitudinally from front to rear is disposed at the horizontally intermediate portion of the movable plate 73 and approximately the vertically intermediate portion. The rod 114 is rotatably mounted to a damper case 116 having flanges extending laterally, and the flanges of the damper case 116 are fixed to vertically elongated flange plates 115. Meanwhile, a recess 117 into which the damper case 116 and flange plate 115 fit is formed on the rear surface of the movable plate 73, and the flange 115 is fixed to the movable plate 73 with upper and lower screws 118 shown in FIG. 7(A) and FIG. 13. The recess 117 of the movable plate 73 forms a land portion 117a that protrudes forward.

[0085] The rear end of the rod 114 is Upper shell body The rod 114 is inserted into a vertically long center slot 119 formed in the damper case 116, and a pinion (gear) 120 is fixed to the rod 114 with a screw 122. The pinion 120 is engaged with a rack 121 provided in the center slot 119. A one-way clutch mechanism built into the damper case 116 is configured so that the rod 114 generates resistance to the downward movement of the movable plate 73 but does not generate resistance to the upward movement of the movable plate 73. In other words, the one-way type rotary damper applies resistance only to the downward movement of the movable plate 73. To be precise, the rod 114 and the damper case 116 constitute the rotary damper.

[0086] It is also possible to apply resistance to the up and down movement of the movable plate 73 by pressing the pinion 120 against the rack 121 with a certain degree of force without using a rotary damper. As shown in Figure 8(B), the center elongated hole 119 is provided with a stopper plate 119a that prevents the pinion 120 from coming off backward.

[0087] In the embodiment, the pinion 120 and one-way rotary damper are used as the damper means, but other damper means such as elastic rollers such as rubber rollers can also be used. The damper means may also be provided on the left and right sliding portions. Head support body 4 The height can be adjusted to any desired height, but it is also possible to adjust the height in stages by using the engagement of the claws and recesses, etc. However, if a structure with a damper function that can be adjusted to any desired height is adopted as in the embodiment, it can be fitted to the user's preference, and a luxurious feel can be created by eliminating the clicking sensation.

[0088] (7) Summary As shown in Figure 16(A)(B), Upper shell body 72 (upper backrest 3b) is curved forward in a concave state when viewed from above, Upper shell body To allow 72 to rotate forward relative to the backrest 3, Upper shell bodyThe left and right ends of 72 must be rotated in a state where they do not come into contact with the top of the backrest 3.

[0089] In this case, as shown in FIG. 16(D), Upper shell body The rotation axis 123 of 72 is Upper shell body 72 and fixed at the rear end thereof, the backrest 3 and Upper shell body 72, and the bearing member 124 protruding from the rear end of the backrest 3. Upper shell body 72 must be connected, but in this case, Upper shell body When 72 rotates forward relative to the backrest 3 as shown by the dotted line, Head support body 4 Any contact point where the front face contacts the user's head will move significantly downward.

[0090] For this reason, when reclining, Head support body 4, the cushion body 74 may slide downwards (head slippage), which may cause discomfort or an unnatural feeling to the user. The same applies when returning from the reclining position to the neutral position, where the cushion body 74 may slide upwards.

[0091] In contrast to this, in the present embodiment, as shown in FIG. 15 and FIG. 17(B), Head support body 4 rotates around a rotation center 85a near the user's neck at a position below the head point 125, Head support body 4 can be rotated to follow the user's head, which eliminates head slippage and provides a comfortable feel.

[0092] In addition, in this embodiment, Upper shell body 72 (or upper backrest 3b) The connecting members 81 and 82 are arranged on both the left and right sides while being curved. Upper shell body Using the middle part of the 72 as a reference, place it as far forward as possible. Backrest 3 It can be stored inside Upper backrest 3b The thickness of the cover 85 can be made as thin as possible, and the rotation center 85a can be positioned around the neck of the user, providing a comfortable feeling to the user.

[0093] In Figure 16(C), Head support body 4 pivot point 123 Upper shell body It can be seen from this figure that by positioning the rotation center 123 as far forward as possible, it is possible to suppress the up and down movement of the head point 125, which is the contact point with the user's head. Head support body It can be seen that head misalignment can be suppressed simply by positioning the rotation center 123 in front of the rearmost end of the lower end of the head 4.

[0094] In this embodiment, the rotation fulcrum 123 in FIG. 16(C) moves up and down along the side arc groove 85, and moves around the rotation center 85a. Head support body 4 moves up and down while changing its posture when viewed from the side, which significantly improves its ability to follow the user's head.

[0095] In addition, in this embodiment, Upper shell body 72 is fitted into the top cap 76 provided on the top surface of the backrest 3, Upper backrest 3b Even if it rotates, Upper shell body 72 and backrest base 3a Therefore, the gap between the seat and the seat is not noticeable. Backrest top 3b and backrest base 3a This allows the chair to maintain a design unity with the surrounding area, giving it high commercial value.

[0096] Heaven The parts include the same protrusions as the top cap 76. Base shell body 38 (middle shell body 37) In this case, Base shell body 38 (middle shell body 37) may be troublesome to mold. Middle shell body 37 If you use the separate top cap 76, the top cap 76 will also middle row The positioning projections 78 of the shell body 37 can also be formed in a state that allows them to be easily removed from the die, which is advantageous in terms of processing.

[0097] In addition, in this embodiment, Head support body 4 has a three-point support structure with the left and right connecting members 81, 82 and the spring 100 located in the middle between the left and right. Head support body 4 (and upper backrest 3b) can be moved easily.

[0098] The present invention can be embodied in various other ways. For example, Upper backrest When a wire cable is used as the interlocking means as in the embodiment, the rotation of the Upper backrest 3b It is also possible to rotate it forward.

[0099] As shown in Figures 16(A) and (B), in this embodiment, the front surface of the cushion body 74 is bulged forward in plan view so that the middle left and right portions are most forward, but it is also possible to form the front surface of the cushion body 74 in a concave shape facing forward in plan view.

[0100] Head support body While moving up and down Upper backrest As the interlocking member for tilting the front and rear, a combination of a pipe curved in an arc and a rod fitted into the pipe can also be used. Upper shell and base It is also possible to form an arc-shaped hole (or arc-shaped groove) integrally with either the shell body or the boss body, and fix the arc-shaped boss body to the other.

[0101] Furthermore, Head support body uses hinges and pins Upper backrest In this case, the center of rotation is below the head point. And the upper part of the backrest Front of the rear end (user's neck (cervical vertebrae) of It is preferable to place it around stomach. [Industrial Applicability]

[0102] The present invention is Reclining chair Therefore, the present invention can be applied industrially. [Explanation of symbols]

[0103] 2nd seat 3 Backrest 3a Backrest base 3b Upper backrest 4 Head support body 10 Tilting Frame 24 Wire cable constituting interlocking means 36 Lower shell body 37 Middle shell body 38 Base shell body 72 Upper shell body (upper backrest body) 73 Head Support body The movable plate that constitutes 74 Head Support body The cushion body that constitutes 75 Upper backrest Back cover of 81, 82 Connecting member 81a: Arc portion constituting the arc-shaped guide portion 85 Side arc groove (main arc groove) that constitutes the arc-shaped guide section 85a Head support body Rotation center (center of curvature radius of arc groove) 95 Center arc groove that supplements the arc-shaped guide section 97,102 Guide shaft 100 springs 125 head points

Claims

1. A headrest is disposed above the backrest so as to be able to rotate forward relative to the backrest, The rotation center of the headrest is located below the head point, which is the part where the user's head hits, and forward of the rearmost surface of the headrest. Chair with headrest.

2. The headrest is composed of a main body disposed above the backrest and a seat cushion disposed in front of the main body. and a head support body for supporting the user's head, and the rotation center is located at least forward of the front surface of the left-right center part of the main body. A chair with a headrest according to claim 1.

3. The headrest is attached to the backrest via a guide means disposed within a thick portion of the headrest, and the rotation center of the headrest is located forward of the guide means. A chair with a headrest according to claim 1 or 2.

4. The main body has a shape recessed forward in a plan view, the guide means are disposed at two locations near both left and right ends of the headrest, and the rotation center of the headrest is located at least forward of the front surface of the left and right intermediate portion of the main body. A chair with a headrest according to claim 3.

5. The guide means is an arc-shaped guide portion that is recessed forward in a side view, and the center of the curvature radius of the arc-shaped guide portion is the rotation center of the headrest. A chair with a headrest according to any one of claims 2 to 4.

6. A top member that fits into the main body is disposed at the upper end of the backrest, and the top member is gently curved so that the upper surface bulges upward when viewed from the front, and is gently tapered so that the front-to-back width narrows toward the top when viewed from the side. A chair with a headrest according to any one of claims 2 to 5.

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