Chair

Abstract

To provide a chair which is unlikely to tire a user even when he or she does not lean against a backrest part.SOLUTION: In a chair, a reception part 6 which receives the pelvis rear surface including the sacrum of a sitter is fitted to a slide body 5 penetrating a seating face part 3 vertically and moving back and forth. A shaft body 12 rotatably fitted to the lower part of the seating face part 3 has: a rocking body 13 fixed to the center; and a control lever 14 fixed to the right end. A tension member 15 is bridged across a slide body 5 and the rocking body 13 to fix a lock member 17 to the right end of the seating face part 3. When the control lever 14 is rocked downward, the rocking body 13 rocks downward via the shaft body 12, and the slide body 5 is pulled forward by the tension member 15 guided by a guide body 16, and the slide body 5 progresses. When the slide body 5 is in the progressing state, the control lever 14 has vertical rocking regulated by the lock member 17. The sitter can receive the pelvis rear surface including the sacrum with the reception part 6 when he or she does not lean against a backrest part 4.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a chair having a support portion that supports the posterior surface of the pelvis including the sacrum of a seated person without the need to lean against the backrest. [Background technology]

[0002] Conventionally, chairs have been proposed that support the posterior surface of the pelvis, including the sacrum, of a seated person leaning against the backrest, thereby maintaining good posture for the seated person and reducing fatigue when sitting for long periods of time (see, for example, Patent Document 1).

[0003] The chair described in Patent Document 1 comprises a base (legs), a seat support member supported by the legs, a seat and pelvis / lumbar support (receiving portion) attached to the seat support member via a swing link, and a backrest (backrest portion) swingably supported on the upper edge of the receiving portion. The receiving portion is attached to the rear end of the seat so as to be swingable relative to the swing link via a pivot. The receiving portion has a front portion extending rearward from the seat and a rear portion extending downward from the backrest, which are arranged at a substantially right angle.

[0004] In the chair described in Patent Document 1, when the backrest is not tilted backward and the upper body is in an upright working position, the action of the swing link causes the seat to tilt slightly forward, and the front part of the support part is raised relative to the seat part, assuming a working position (see Figure 2 of Patent Document 1). At this time, the front part of the support part supports the posterior surface of the pelvis, including the sacrum, of the seated person. Furthermore, in this working position, the upper end of the rear part of the support part protrudes forward, and this rear part of the support part supports the seated person's lower back.

[0005] In addition, in the chair described in Patent Document 1, when the seated person leans against the backrest and tilts the backrest backward, the chair transitions from the working position to the rest position. In the rest position, the front portion of the seat and the receiving portion tilt slightly backward along the seat, and the rear portion of the receiving portion and the backrest are positioned on the same plane. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 186605 / 1983 Summary of the Invention [Problem to be solved by the invention]

[0007] By the way, when you are sitting in a chair and talking face to face with someone, leaning on the back of the chair may be considered rude to the other person. In this case, you need to sit shallowly in the chair and talk without leaning on the back of the chair. People with a strong and sturdy core do not get tired even if they sit in a chair without leaning on the back of the chair. However, in general, elderly people and people with abdominal muscles, People with weak back muscles or weak stomachs (hereinafter referred to as elderly people) may get tired if they sit without leaning against the back of a chair.

[0008] However, when the chair described in Patent Document 1 is in the working position, if the occupant sits shallowly on the seat, the front part of the support cannot support the posterior surface of the pelvis, including the sacrum, and elderly people and others become tired and are unable to sit for long periods of time.

[0009] Therefore, an object of the present invention is to provide a chair that does not cause fatigue even when not leaning on the backrest. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention has the following configurations 1 to 3. [Configuration 1] The legs and A seat supported by the legs; A chair having a backrest portion provided above the rear end side of the seat portion, a slider that penetrates the seat portion in the up-down direction and is provided so as to be movable in the front-rear direction from a rear end portion of the seat portion; a receiving portion attached to the slide body and positioned on the seat portion, The receiving portion has a support surface portion that receives the rear surface of the pelvis of a seated person sitting on the seat surface portion, The chair is characterized in that it has a locking member that holds the sliding body in an advanced state in which the sliding body moves forward and the support surface portion of the receiving portion is positioned forward of the front surface of the backrest portion.

[0011] In this configuration, when the slider is held in the forward position by the locking member, the support surface of the receiving part of the slider is positioned forward of the front surface of the backrest. Therefore, the occupant can support the posterior surface of the pelvis on the support surface of the receiving part without leaning against the backrest. Here, the posterior surface of the pelvis means the posterior surface of the pelvis including the sacrum.

[0012] [Configuration 2] a shaft body rotatably attached to the rear side of the lower part of the seating surface; a swinging body that is fixed to the shaft body in a state where it protrudes forward and swings up and down around the shaft body as a rotation center; a flexible tension member that is stretched between the slider and the swinging body; a guide body that is brought into contact with the tension member from below and guides the tension member downward toward the swing body; an operating lever that is fixed to the shaft body in a state where it protrudes forward and that swings up and down around the shaft body as a rotation center, The chair described in configuration 1, characterized in that the sliding body is biased rearward and, when the sliding body is in the forward state, the locking member restricts the vertical swing of the operating lever.

[0013] In this configuration, when the operating lever is swung downward, the shaft rotates and the swinging body swings downward. When the swinging body swings downward, the tensioning member is pulled downward, and the tensioning member, guided by the guide member, pulls the sliding body forward, causing the sliding body to move forward. When the sliding body is in the forward position, the locking member restricts the operating lever from swinging up and down.

[0014] [Configuration 3] The operating lever is located outside the seat portion in the left-right direction, The locking member is fixed to one edge of the seat portion in the left or right direction, the locking member is an annular member that opens in the front-rear direction and extends in the up-down direction, and the operating lever is inserted into an inner peripheral portion of the locking member, The upper part of the locking member allows the operating lever to move up and down inside the upper part, The lower part of the locking member is capable of moving the operating lever in the up and down direction on one side in the left and right direction inside the lower part of the locking member, A chair as described in configuration 2, wherein a plurality of locking protrusions are provided at intervals in the vertical direction on the other left-right end of the inner peripheral portion of the lower part of the locking member, and the operating lever can be locked to each of the locking protrusions.

[0015] With this configuration, by locking the operating lever to one of the locking protrusions provided on the inner peripheral portion of the lower part of the locking member, the vertical swing position of the operating lever can be adjusted in stages. Also, the front-rear position of the slider relative to the seat portion can be adjusted in stages according to the vertical swing position of the operating lever. [Effects of the Invention]

[0016] According to this invention, the sliding body can be brought into the forward position relative to the seat portion and maintained in that forward position by the locking member, so that the occupant can support the rear of their pelvis with the support surface of the receiving part without leaning against the backrest, thereby keeping their spine in a nearly normal position. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a chair according to an embodiment of the present invention; [Figure 2] FIG. 10 is a side view showing a state in which the slider has moved rearward in the embodiment; [Figure 3] FIG. 10 is a side view showing a forward movement state of the slider in the same embodiment. [Figure 4] FIG. 2 is a perspective view showing a slider according to the embodiment; [Figure 5] FIG. 10 is a bottom view showing a state in which the slider has moved rearward in the embodiment. [Figure 6] FIG. 10 is a bottom view showing the forward movement state of the slider in the same embodiment. [Figure 7] Cross section along line AA in Figure 5 [Figure 8] FIG. 10 is an enlarged cross-sectional view of a main part showing an attached state of the slide rail according to the embodiment; [Figure 9] FIG. 1A is a longitudinal cross-sectional view showing a state in which the slider of the embodiment has moved rearward; FIG. 1B is a longitudinal cross-sectional view showing a state in which the slider of the embodiment has moved forward; DETAILED DESCRIPTION OF THE INVENTION

[0018] A chair according to an embodiment of the present invention will be described with reference to Figures 1 to 9. As shown in Figures 1 to 3, chair 1 comprises legs 2, a seat 3 supported by legs 2, a backrest 4 provided above the rear end of seat 3, a slider 5 provided so as to be movable in the front-to-rear direction from the rear end relative to seat 3, and a receiving portion 6 attached to slider 5 and located on seat 3. Hereinafter, the terms "front-to-rear" and "left-to-right" refer to directions that correspond to the direction of a seated person seated with their back to backrest 4 and looking directly at seat 3.

[0019] The leg section 2 has multiple legs 2a that extend radially and a pillar 2b that stands upright from the center of the multiple legs 2a. Casters 2c are attached to the tips of the multiple legs 2a.

[0020] The seat 3 has a base plate 3a and a synthetic resin cushion plate 3b fixed to the base plate 3a and covered on its outer surface with upholstery. It has a generally rectangular shape in plan view. The seat 3 is rotatably supported at the center of the base plate 3a by the pedestal 2b of the leg 2. The left and right sides of the cushion plate 3b rise upward from the center toward the rear. The rear end of the seat 3 rises upward to connect with the rear ends of the left and right sides of the seat 3. The seat 3 has a pair of slits 3c extending forward from the rear end. The rear end of the cushion plate 3b, located laterally inward of the pair of slits 3c, does not rise upward and has the same vertical thickness as the center of the cushion plate 3b (see Figure 7). A protruding plate 3d protruding downward is fixed to the rear end of the base plate 3a.

[0021] The backrest 4 extends from the top of the leg posts 2b of the legs 2 to the rear of the seat 3, and is provided above the rear end of the seat 3 via a pair of support posts 4a that extend further upward. The backrest 4 is made of a synthetic resin cushion, the outer surface of which is covered with upholstery.

[0022] As shown in Figures 3 and 4, the slider 5 has a pair of side plates 5a that penetrate the seat 3 in the up-down direction, a front plate 5b that connects the pair of side plates 5a at their lower and front ends, and buffer plates 5c that are fixed to the lower and rear ends of each of the pair of side plates 5a. The pair of side plates 5a face each other in the left-right direction. The pair of side plates 5a are inserted into a pair of slits 3c in the seat 3, respectively. A receiving portion 6 is provided between the upper portions of the pair of side plates 5a.

[0023] As shown in Figure 1, the receiving portion 6 has the same height as the rear end portion of the cushion portion 3b of the seat portion 3. Furthermore, the receiving portion 6 has the same cross-sectional shape in the up-down direction as the rear end portion of the cushion portion 3b at a position closer to the slit 3c. The support surface portion 6a that forms the front surface of the receiving portion 6 is a curved surface that is concave backward from top to bottom so that it can support the rear surface of the pelvis of the seated person.

[0024] A coil spring 7, which is stretched from its natural state, is attached between the front plate 5b and the protruding plate 3d. The elastic restoring force of the coil spring 7 urges the sliding body 5 rearward. The rear end of a tension member 15, which will be described later, is attached to the front surface of the front plate 5b. An elastic body 5d is fixed to the rear surface (the surface facing rearward) of the buffer plate 5c. As shown in FIG. 5, when the sliding body 5 slides rearward, the elastic body 5d of the buffer plate 5c hits the protruding plate 3d of the leg 2, restricting the sliding body 5 from moving rearward. The elastic body 5d of the buffer plate 5c absorbs the impact when it hits the protruding plate 3d.

[0025] As shown in Figures 7 and 8, slide rails 8 are attached between the pair of side plate portions 5a and the base portion 3a of the seat portion 3. The slide rails 8 are arranged in the front-rear direction along the pair of slits 3c of the seat portion 3. The slide rails 8 include a guide rail 9, a slider 10 that moves in the length direction within the guide rail 9, and balls 11 as rolling elements interposed between the guide rail 9 and the slider 10.

[0026] The guide rail 9 has flange portions 9a on both edges of a strip-shaped member. The strip-shaped member of the guide rail 9 is fixed to the base plate portion 3a of the seat portion 3 via fixing pieces 8a. The slider 10 has flange portions 10a on both edges of the strip-shaped member. The strip-shaped member of the slider 10 is fixed to the outer side in the left-right direction of the lower end of the side plate portion 5a. The flange portions 9a of the guide rail 9 and the flange portions 10a of the slider 10 face each other in the vertical direction, and balls 11 held by retainers 11a are arranged rollably between these flange portions 9a, 10a. Note that a commercially available slide rail can be used for this slide rail 8.

[0027] As shown in Figure 6, by moving the slider 10 within the guide rail 9 in the length direction (front-to-back direction) of the guide rail 9, the sliding body 5 can be moved in the front-to-back direction relative to the seat portion 3 along the slit 3c in the seat portion 3.

[0028] A shaft 12 is rotatably supported along the left-right direction on the rear side of the base plate 3a of the seat 3. The shaft 12 is formed from a metal rod. A pair of left and right bearing units 12a, fixed to the base plate 3a and extending downward, support the shaft 12 rotatably about its axis. As shown in FIG. 5, a rocker 13 made of a metal rod and an operating lever 14 are fixed to the shaft 12. The rocker 13 has a pair of support shafts 13a extending forward from the shaft 12 and a front shaft 13b integrally formed between the front ends of the pair of support shafts 13a. The front shaft 13b is arranged along the left-right direction and is located forward of the leg posts 2b of the leg 2. The pair of support shafts 13a are horizontal when the slider 5 is located at the rear end of the seat 3. The rocker 13 rocks up and down as the shaft 12 rotates.

[0029] The operating lever 14 extends forward from one of the left and right ends of the shaft 12 (the right end in FIG. 5). When the sliding body 5 is located at the rear end of the seat 3, the operating lever 14 extends upward as it moves forward. The front end of the operating lever 14 is located at the front end of the seat 3. With this positional relationship, the vertical swing of the operating lever 14 and the vertical swing of the swing body 13 are synchronized and swing in the same vertical direction via the shaft 12.

[0030] As shown in Fig. 5, a plurality of flexible tension members 15 (for example, two in Fig. 5) are spanned between the front plate portion 5b of the sliding body 5 and the front shaft portion 13b of the swinging body 13. In this embodiment, a flexible metal wire that can be easily bent by hand can be used as the tension members 15. Note that the tension members 15 can be made of any flexible material, such as synthetic resin, natural material, or a mixture of these, and can be in the shape of not only a wire but also a string or a band.

[0031] As shown in Fig. 2, a guide body 16 that contacts the tension member 15 from below is fixed to the base plate portion 3a of the seat portion 3. The guide body 16 is rotatably held by a shaft (not shown) such as a pulley or roller. The guide body 16 is positioned above the front shaft portion 13b of the rocking body 13. The guide body 16 in this position guides the tension member 15 downward toward the front shaft portion 13b of the rocking body 13.

[0032] A locking member 17 is fixed to one of the left and right edges of the base plate 3a of the seat 3 (for example, the right end in FIG. 1). The locking member 17 is disposed closer to the front end of the seat 3. As shown in FIG. 7, the locking member 17 is an annular member that opens in the front-rear direction, and the operating lever 14 passes through the inside of it. The inner periphery of the locking member 17 is formed in the shape of an elongated hole that extends in the vertical direction, and the opening width is narrower at the top than at the bottom.

[0033] The upper part of the inner periphery of locking member 17 is formed slightly larger than the thickness (diameter of the metal rod) of operating lever 14, allowing operating lever 14 to move up and down. The lower part of locking member 17 is formed so that the right side (the side farther from seat 3 in the left-right direction) of the upper part of locking member 17 widens outward in the left-right direction. In addition, on the left side of the inner periphery of the lower part of locking member 17 (the side closer to seat 3 in the left-right direction), multiple locking protrusions 17a are provided facing outward in the left-right direction at intervals in the up-down direction.

[0034] The chair 1 according to the embodiment of the present invention is configured as described above. Next, how to use this chair 1 will be described with reference to the drawings. First, the sliding body 5 moves rearward due to the elastic restoring force of the coil spring 7. At this time, as shown in Figures 5 and 9(a), the elastic body 5d of the buffer plate portion 5c of the sliding body 5 abuts against the protruding plate portion 3d of the seat portion 3. In addition, the operating lever 14 is locked to the upper end of the inner periphery of the locking member 17. When a person sitting on the chair 1 in this state leans against the backrest portion 4, the rear surface of the person's pelvis moves forward away from the receiving portion 6.

[0035] 3, the operating lever 14 is swung downward until it approaches a horizontal position, and is moved from the top to the bottom of the locking member 17. Next, the operating lever 14 is further lowered while aligning it with the right side of the inner periphery of the locking member 17 (the side opposite the seat surface 3 in the left-right direction). After the operating lever 14 has moved to the bottom end of the inner periphery of the locking member 17, the operating lever 14 is moved to the left side within the locking member 17 (towards the seat surface 3 in the left-right direction) and the operating lever 14 is engaged with the bottom of the lowest engaging protrusion 17a of the locking member 17.

[0036] When the operating lever 14 is swung downward, the shaft 12, which is attached to one end of the operating lever 14 in the left-right direction, rotates in the forward direction. As the shaft 12 rotates, the swinging body 13 swings downward, and the tensioning member 15 fixed to the swinging body 13 is pulled downward. Since the orientation of the tensioning member 15 is changed by the guide body 16, when the tensioning member 15 is pulled, the sliding body 5 is pulled and moves forward. Here, as shown in FIG. 8 , the slider 10 of the slide rail 8 is fixed to the sliding body 5. In addition, the guide rail 9 of the slide rail 8 is fixed to the base portion 3a of the seat portion 3 via a fixing piece 8a.

[0037] 6 and 9(b), the slider 10 moves forward together with the sliding body 5 along the guide rail 9 via the plurality of rolling bodies 11 held by the retainer 11a. In this way, the sliding body 5 can move smoothly in the front-rear direction because it uses the slide rail 8.

[0038] When the sliding body 5 is moved forward and the operating lever 14 is engaged with the lower part of the lowest locking protrusion 17a of the locking member 17, the sliding body 5 enters an advanced state in which the support surface portion 6a of the receiving portion 6 is positioned forward of the front surface of the backrest portion 4, as shown in Figure 3.

[0039] When the occupant sits on chair 1 in this forward position, the support surface 6a of receiving part 6 can support the rear of the pelvis without leaning against backrest 4. Therefore, even if an elderly person sits shallowly without leaning against backrest 4 of chair 1, the rear of the pelvis is supported by support surface 6a of receiving part 6, and the spine can be kept in a nearly normal position, so that the occupant does not get tired easily.

[0040] Next, to move the receiving portion 6 backward from the forward position, move the operating lever 14 to the right (opposite the seat surface 3 in the left-right direction) to release it from the engagement with the locking protrusion 17a of the locking member 17. Then, while holding the operating lever 14 by hand, place it along the right side of the inner periphery of the locking member 17 (opposite the seat surface 3 in the left-right direction). In this state, the sliding body 5 moves rearward due to the elastic restoring force of the coil spring 7. The sliding body 5 moving rearward pulls the tensioning member 15 rearward. Because the direction of the tensioning member 15 is changed by the guide body 16, the swinging body 13 to which the tensioning member 15 is fixed moves upward, and the shaft body 12 rotates in the reverse direction. The operating lever 14 swings upward together with the shaft body 12 rotating in the reverse direction. When the operating lever 14 reaches the top end of the inner periphery of the locking member 17, release the operating lever 14. Then, the slide body 5 moves back, and the elastic body 5d of the buffer plate portion 5c returns to the state where it abuts against the protruding plate portion 3d of the seat portion 3.

[0041] Furthermore, the locking member 17 has a plurality of locking protrusions 17a provided on the left side of the inner periphery of its lower portion (on the seat surface 3 side in the left-right direction) at intervals in the up-down direction and facing outward in the left-right direction. If necessary, the vertical swing position of the operating lever 14 can be adjusted in stages by locking the operating lever 14 with one of the plurality of locking protrusions 17a. Then, the front-rear position of the sliding body 5 with respect to the seat surface 3 can be adjusted in stages according to the vertical swing position of the operating lever 14. [Explanation of symbols]

[0042] 1 chair 2 legs 3 Seat part 3a Board part 3b Cushion part 3c slit 3d protruding plate part 4 Backrest 5 Slide body 5a Side plate part 5b Front plate part 5c Buffer plate part 5d elastic body 6 Receiving part 6a Support surface part 7 Coil spring 8 slide rails 8a Fixed piece 9 Guide Rails 10 Sliders 11 Ball (rolling element) 12 shaft body 12a Bearing unit 13 Oscillator 14 Operating lever 15 Tensile members 16 Guide body 17 Locking member 17a Locking protrusion

Claims

1. The legs, A seat supported by the legs; A chair having a backrest portion provided above a rear end side of the seat portion, A slider that is provided so as to be movable in the front-rear direction from a rear end portion of the seat portion in a state in which the slider penetrates the seat portion in the up-down direction; a receiving portion attached to the slide body and positioned on the seat portion, The receiving portion has a support surface portion that receives the rear surface of the pelvis of a seated person sitting on the seat portion, A chair characterized in that the sliding body is moved forward and has a locking member that holds the sliding body in an advanced state in which the support surface portion of the receiving portion is positioned forward of the front surface of the backrest portion.

2. A shaft body rotatably attached to a rear side of a lower portion of the seat portion; a swinging body that is fixed to the shaft body in a state where it protrudes forward and swings up and down around the shaft body; a flexible tension member that is stretched between the sliding body and the rocking body; a guide body that is brought into contact with the tension member from below and guides the tension member downward toward the swinging body; an operating lever that is fixed to the shaft body in a state where it protrudes forward and that swings up and down about the shaft body, 2. The chair according to claim 1, wherein the sliding body is biased rearward, and when the sliding body is in the forward position, the locking member restricts the vertical swing of the operating lever.

3. The operating lever is located on one of the outer sides of the seat portion in the left-right direction, and the locking member is fixed to one of the edge portions of the seat portion in the left-right direction, the locking member is an annular member that opens in the front-rear direction and extends in the up-down direction, and the operating lever is inserted into an inner peripheral portion of the locking member, The upper portion of the locking member allows the operating lever to move up and down therein, The lower part of the locking member is capable of moving the operating lever in the up and down direction on one side in the left and right direction inside the lower part of the locking member, 3. The chair according to claim 2, wherein a plurality of locking projections are provided at the other left-right end of the inner peripheral portion of the lower portion of the locking member at intervals in the vertical direction, and the operating lever can be locked to each of the locking projections.

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