JP2005279115A - Back panel structure for chair and chair using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an unconventional, novel back panel structure for a chair, permitting easily and almost fixedly changing the shape of a back panel which highly matches the personal characteristics of a user, varying according to users, by simple operation, and speedily changing the shape of the back panel when the user is changed or the size of the user's body is changed. <P>SOLUTION: The back panel structure has a rigid support base material 52 whose position can be adjusted in the height direction of a back frame 16. A flexible back plate 64 is supported to the support base material 52, and both end edges of the back plate 64 are connected to the support base material and supported. The tension applied in the longitudinal direction of the back plate 64 can be adjusted. The back panel structure also has a traction means 80 for tightening the back plate 64 to the support base material at a plurality of positions in the intermediate area in the longitudinal direction of the back plate 64 and holding the back plate 64 in the deformed state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chair size adjustment and a body fit adjustment for realizing a chair that is highly compatible with a user's physical characteristics, and in particular, a backrest in a sitting chair or a wheelchair. The present invention relates to a novel back plate structure capable of realizing a function of advanced body adaptation adjustment for a person having various postures and physical characteristics, and a novel chair using the same.

  2. Description of the Related Art Conventionally, a chair with a backrest provided with a seat that supports a person's buttocks and a back that holds the upper body of the person has been widely used. In such a chair, it is desirable to particularly associate the shape of the backrest surface so that a preferred sitting posture can be supported according to the physical characteristics of the person who is seated. For example, it is the same with ordinary work chairs and easy chairs, but especially for those who are difficult to take a normal sitting position with a general chair due to problems with the person's sitting posture maintenance function such as the elderly or disabled people. It is an important requirement that the backrest surface matches the physical characteristics.

  Conventionally, in order to meet such demands, cushioning materials such as urethane foam are frequently used on the surface of the back plate provided on the back frame of the chair, or the shape of the cushioning material is appropriately changed. However, there was a problem that urethane foam was too soft, and molding corresponding to different physical characteristics was troublesome. Especially for people with disabilities, the skeleton was not only curved left and right and back and forth, but also often twisted, making it difficult to respond to various demands.

  Therefore, in order to deal with such a problem, in Japanese translations of PCT publication No. 10-502836 (Patent Document 1), a plurality of tape-like bands that are easily bent are arranged in the height direction, A chair has been proposed in which both ends are supported by a frame-shaped back frame and a mechanism for adjusting the tensile force in the longitudinal direction of each band is provided. Further, in Japanese translations of PCT publication No. 8-502187 (Patent Document 2), Japanese Patent Publication No. 9-507034 (Patent Document 3), and Japanese Patent Publication No. 2000-517220 (Patent Document 4) By supporting the upper and lower edges of a single concavo-convex sheet with a wire and adjusting the tension of the two stretching wires, the chair can be adjusted in elevation angle and overhead angle along with the amount of curvature of the concavo-convex sheet. Has been proposed.

  However, even if the back plate structure of the chair described in any of these Patent Documents 1 to 4, the back plate is simply composed of a tape-like band that is loosely stretched left and right with a small tension, The band is passively deformed by using the body pressure of the user leaning on, and is merely deformed along the user's body. Further, even in the mechanism for adjusting the elevation angle and the overhead angle described in Patent Documents 2 to 4, eventually, the belt is passively deformed along the user's body using the leaning user's body pressure. I just made it happen.

  Therefore, in the back board structure of these patent documents 1-4, according to a user's individual state, the back board provided with the shape corresponding highly to it cannot be realized, but a user's seat posture It was extremely difficult to actively support and support That is, in the back plate structures described in Patent Documents 1 to 4, if the user moves, the belt constituting the back plate is also deformed accordingly, and therefore the user cannot maintain the sitting posture. Even if the body falls down, it cannot be supported to prevent the body from falling down, and the shape of the back plate is simply deformed according to the body shape change of the user who falls down.

  In this case, a chair that can individually support different physical characteristics for each user and can exhibit an effective support function for the sitting posture could not be realized. It has been eagerly desired in society to provide an inexpensive and efficient service.

Japanese National Patent Publication No. 10-502836 JP-T 8-502187 Japanese National Patent Publication No. 9-507034 Special Table 2000-517220

  Here, the present invention has been made in the background of the circumstances as described above, and the problem to be solved is the shape of the back plate that is highly matched individually to different physical characteristics for each user. Can be realized easily and substantially in a simple manner, and the back plate shape can be changed quickly in response to changes in the user and body shape. The object is to provide a chair backboard structure.

  In addition, by adopting such a chair backboard structure, the present invention can be used not only by a healthy person but also by an elderly person or a handicapped person, and appropriately supports the person's sitting posture maintenance function. It is also an object to provide a chair with a novel structure that can be used.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

(The present invention relating to a back plate structure for a chair)
The features of the present invention relating to the back plate structure for a chair are as follows: (a) a chair back that forms a backrest surface by being attached to a back frame that protrudes upward from the seat frame. A plate structure, (b) a plurality of rigid support bases each having a split structure attached to a plurality of different locations in the height direction of the back frame and extending in the left-right direction; A) fixing means capable of positioning and fixing the plurality of support bases so as to be position-adjustable with respect to the back frame; and (d) a band plate shape that is positioned in front of each support base. A plurality of flexible back plate plates arranged to extend in the left-right direction with a predetermined width, and (e) connecting both longitudinal edges of the back plate plates to the support bases. And support the back Connecting means for adjusting the tension applied to the longitudinal direction of the back plate plate by adjusting the connecting position of the back plate plate to the support base in the left-right direction at at least one end edge in the longitudinal direction of the plate And (f) traction means for tightening the back plate against the support base and holding the back plate in a deformed state at a plurality of locations in the longitudinal middle portion of each back plate. Located in chair backboard structure.

  In such a chair back plate structure according to the present invention, the tension applied to the back plate by the connecting means is adjusted and set by the connecting means, so that the degree of curvature of the back plate plate as a whole is adjusted. In addition to being able to set as appropriate, by setting the middle part of the backplate plate to the supporting base material fixedly by the traction means, the overall shape of the backplate plate is set to a predetermined deformation state , It can be held in the deformed state.

  Therefore, according to such a back plate structure, according to the individual state of the user, it is possible to realize a back plate having a shape that corresponds to a high degree in a fixed manner. It is possible to actively support and support the sitting posture.

(The present invention relating to a chair)
In addition, the present invention relating to a chair is characterized by comprising a back frame protruding so as to extend upward from the seat frame, and the back frame is structured in accordance with the present invention as described above. At least three chair backboard structures are mounted, and the backrest plate in the chair backboard structure cooperates to form a backrest board surface.

  In such a chair according to the present invention, the chair back plate structure having a specific structure according to the present invention as described above is used, so that different physical characteristics for each user can be obtained. A chair that can be individually matched and can exhibit an effective support function for the sitting posture can be advantageously realized. In particular, the chair according to the present invention is to provide a chair having a common structure even when a wide variety of back plate shapes are required corresponding to a wide variety of body shapes. Thus, the shape of the back plate can be changed and adjusted in an easy and accurate manner in accordance with each user, and even with the same user in accordance with changes in body shape over time.

(Preferred embodiment adopted in the present invention)
In the present invention, the following configurations can be arbitrarily and suitably employed.

  That is, in the present invention, for example, a configuration in which the supporting base can be adjusted in any of the height direction, the left-right direction, and the front-rear direction with respect to the back frame by the fixing means is preferably used. Adopted. By adopting such a configuration, it becomes possible to cope with higher accuracy with respect to the height of the user and the degree of distortion of the front and rear, left and right body shapes, and more advanced support functions can be realized. Become.

  In the present invention, for example, a configuration in which an elevation angle and an overhead angle with respect to the support base material at the end edge in the longitudinal direction of the back plate can be adjusted by the connecting means is preferably employed. By adopting such a configuration, it becomes possible to cope with the degree of distortion in the front-rear direction of the user's body shape with particularly high accuracy, and a more advanced support function can be realized.

  Furthermore, in the present invention, for example, a configuration in which different elevation angles and overhead angles can be set independently from each other at both end edges in the longitudinal direction of the back plate by the connecting means is preferably employed. The By adopting such a configuration, it is possible to cope with a high degree of accuracy even in the case of complicated twisting difference between the left and right sides of the user's body shape, and a more advanced support function can be realized.

  Further, in the present invention, for example, the connecting means is capable of independently adjusting the connecting position of the back plate with respect to the support base at the upper and lower portions of the back plate. A configuration is preferably employed in which the tension exerted in the longitudinal direction of the plate plate can be adjusted differently at both side edge portions in the width direction of the back plate plate. By adopting such a configuration, it becomes possible to set the overall degree of curvature in both side portions in the width direction (vertical direction) of the back plate so that it is different from the upper portion of the back plate. Different back plate surface shapes can be set in the lower portion, and it is possible to cope with the user's body shape with higher accuracy, thereby realizing a more advanced support function.

  In the present invention, for example, a configuration in which the traction means is provided near both end edges in the width direction of the back plate is preferably employed. By adopting such a configuration, it is possible to set different back plate surface shapes on the upper and lower portions of the back plate, and it is possible to respond to the body shape of the user with higher accuracy. It becomes.

  Furthermore, in the present invention, for example, a configuration in which the back plate is formed of a synthetic resin material that can be elastically deformed but does not substantially expand and contract is suitably employed. By adopting such a configuration, it is possible to set the target shape according to the user to the back plate with higher accuracy and to suppress deformation from the set shape, thereby Therefore, it is possible to realize a support function for a user with a more advanced sitting posture.

  As is clear from the above description, by adopting the chair backboard structure according to the present invention, a backboard having a shape corresponding to a high degree according to the individual state of the user can be provided. It can be realized, and it becomes possible to support the user's sitting posture positively. In particular, by adjusting and setting the back plate plates divided and arranged in a plurality in the height direction independently of each other, it is possible to cope with a complicated shape on the back of the upper body of the user as a whole with high accuracy.

  In addition, in the chair backboard structure having the structure according to the present invention and the chair employing the same, the shape of the backboard surface can be fixedly designed in a wide range, and the set shape It is also possible to quickly and easily change and set. Therefore, it is sufficient to provide a single or a small number of varieties to users with a wide variety of body shapes and users whose body shape changes. Can also be realized.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows a wheelchair 12 as a chair provided with a back plate structure 10 having a structure according to the present invention. The wheelchair 12 of the present embodiment includes a seat formed by a seat frame 14 or the like, and a back formed by a back frame 16 or the like. In the following description, the up-down direction and the front-rear direction refer to the up-down direction and the front-rear direction in the wheelchair 12 in principle, and the up-down direction and the left-right direction in FIG. The left-right direction of the wheelchair 12 refers to the left-right direction of the back frame 16 that is the left-right direction of the person who is seated.

  More specifically, the seat frame 14 is made of a rigid material such as metal, and has a rectangular frame or a ladder frame structure as a whole. On the seat frame 14, a seat cushion 18 having a substantially square shape in a plan view is placed and fixed so as to cover the seat frame 14 almost entirely. Thus, a seating surface is formed. The seat cushion 18 supports the occupant's buttocks and thighs from below. A step frame 20 that extends obliquely forward and downward is attached to the front edge of the seat frame 14, and a step 22 that supports the sole of the seated person is attached to the lower end of the step frame 20. Has been.

  On the other hand, the back frame 16 is formed of a rigid material such as a metal, and has a rectangular frame or a ladder frame structure as a whole including a pair of left and right vertical rods 24 and 24 (see FIG. 2). Furthermore, a plurality of (three in this embodiment) back plate structures 10 are mounted on the back frame 16 at a predetermined distance from each other in the height direction (vertical direction). And, for the back plate surfaces 26, 26, 26 formed by these three back plate structures 10, one back cushion that is substantially rectangular in plan view is not shown in the drawing, By covering and wearing the back plate surfaces 26, 26, 26 so as to cover the whole, the body portion from the back to the shoulder of the seated person is supported from behind.

  As shown in FIGS. 2 to 4, each back plate structure 10 has a base member 30 attached to the vertical rods 24, 24 of the back frame 16 so as to be slidable in the vertical direction. The base member 30 includes front and rear plates 34 and 34 that sandwich the vertical rods 24 and 24 from the front and rear directions via non-slip members 32 and 32 such as rubber sheets. These front and rear plates 34, 34 are tightened in the overlapping direction by tightening bolts 38, 38 via spacers 36, 36, so that the front and rear plates 34, 34 are pressed against the vertical rods 24, 24. It is supposed to be fixed. Further, by loosening the tightening bolts 38, 38, the front and rear plates 34, 34 can be slid up and down along the vertical rod 24 to adjust the position.

  A rod insertion hole is formed in each central portion of the front and rear plates 34, 34 constituting the base member 30, and the support main shaft 42 is inserted through the rod insertion hole. The support main shaft 42 is composed of straight pipe fittings, and is guided by sliding guide rings 44, 44 made of a synthetic resin material fixed to the front and rear plates 34, 34 to change the protruding amount in the axial direction. It can be adjusted. The rear plate 34 is provided with a screw-type fastening fixture 46. By operating a fastening handle 47 of the fastening fixture 46, the support main shaft 42 can be slid in the axial direction. The protruding amount in the axial direction can be adjusted, or the supporting main shaft 42 can be fixed in the axial direction and the protruding amount in the axial direction can be fixed.

  Further, a support bush 48 extending in the vertical direction is fixed to the front end of the support main shaft 42 protruding forward by welding or the like. A metal plate 52 as a support base is attached to the support bush 48. The metal plate 52 is formed of a metal rigid material. In the present embodiment, the metal plate 52 spreads in a strip shape in the left-right direction with a predetermined width in the up-down direction, and at the left and right side edge portions of the metal plate 52. Is formed integrally with a pair of left and right support pieces 54, 54 that bend and extend forward.

  Further, a pair of upper and lower attachment pieces 56 and 56 projecting rearward are integrally formed on the back surface of the metal plate 52. The pair of upper and lower mounting pieces 56, 56 are formed with slit-like slide holes 60, 60 extending substantially in the left-right direction. Then, a support bush 48 is fitted between the pair of upper and lower attachment pieces 56, 56, and the tightening bolt 62 is inserted into the slide holes 60, 60 of the upper and lower attachment pieces 56, 56 and the center hole of the support bush 48. It is inserted.

  With this tightening bolt 62, the metal plate 52 is connected to the support bush 48 so as not to be detached. Further, by loosening the tightening bolt 62, the tightening bolt 62 inserted into the support bush 48 is allowed to move along the slide holes 60, 60 of the pair of upper and lower mounting plates 56, 56. By such an operation, the position of the metal plate 52 can be adjusted by slidably moving in the left-right direction with respect to the support bush 48. On the other hand, by tightening the tightening bolt 62, the metal plate 52 is fixedly connected to the support bush 48 and is connected to position fixing.

  As is clear from this, in the present embodiment, the base member 30 that is movably fixed to the back frame 16 and the support that is fixed to the base member 30 so as to protrude and displace in the front-rear direction. The metal plate 52 serving as a support base is connected to the back frame 16 so that the position of the metal plate 52 can be adjusted by the connecting structure of the main plate 42 and the metal plate 52 fixed to the support main shaft 42 so as to be slidable in the lateral direction. Thus, a fixing means capable of positioning and fixing is configured.

  Further, as shown in FIGS. 2 to 9, a back plate 64 is disposed in front of the metal plate 52 so as to be spaced apart. The back plate 64 has a large tensile strength and does not substantially stretch or deform, but can be deformed relatively easily. Preferably, the back plate 64 quickly returns to its original shape by removing external force after the deformation. A thing with the elasticity which can be recovered is employ | adopted. Specifically, those made of a suitable synthetic resin material are desirable.

  The back plate 64 has a thin plate shape as a whole, has a vertical dimension that is substantially the same as or slightly larger than that of the metal plate 52, and is substantially the same as or slightly smaller than the metal plate 52. It has a length dimension in the left-right direction. Further, reinforcing connecting metal fittings 66 and 66 are superposed on the surface of the back plate 64 at both ends in the longitudinal direction so as to straddle the front and rear, and are laminated and fixed. Drive blocks 68 and 68 are fixed to the rear surface of each connection fitting 66 so as to be located near both edge portions in the vertical direction and project rearward. Each drive block 68 is provided with a screw hole penetrating in the left-right direction.

  Further, a channel fitting 74 that extends in the vertical direction with a U-shaped cross section is superimposed on the back surface of each connecting fitting 66. These channel fittings 74, 74 are overlapped on the outer wall portion with respect to the support pieces 54, 54 provided at both ends in the longitudinal direction of the metal plate 52, and are connected by connecting bolts 58, 58 at the substantially central portion. Connected and fixed.

  Here, the front end surfaces of the support pieces 54 and 54 have a substantially arc shape with a center point on the connection bolt 58 side, and by loosening the connection bolt 58, the mounting direction of the channel fitting 74 with respect to the support piece 54 can be changed. It can be adjusted by swinging up and down around the central axis of the connecting bolt 58. Further, by tightening the connecting bolt 58, the mounting position of the channel fitting 74 can be fixedly set and held.

  Further, the channel fitting 74 is formed with slit holes 70 extending in the left-right direction near the upper and lower end edges. Through these slit holes 70, 70, drive blocks 68, 68 fixed to the connecting metal fitting 66 are positioned so as to protrude from the rear surface, and each drive block 68 is arranged in the longitudinal direction (left and right) in the slit hole 70. Direction).

  In addition, adjustment screws 72 and 72 extending between both side wall portions are attached to the channel fitting 74 near the upper and lower end edges. The adjusting screws 72 and 72 are screwed into the screw holes of the drive blocks 68 and 68 fixed to the connection fitting 66 at the intermediate portion in the axial direction, respectively.

  Thus, by rotating the adjusting screws 72, 72, the position of the longitudinal end edge of the back plate 64 can be adjusted in the horizontal direction with respect to the channel fitting 74 at the upper and lower portions, respectively. In addition, it can be fixedly held at that position.

  That is, the back plate 64 is connected to the metal plate 52 via the channel fittings 74 at both ends in the longitudinal direction, and is supported in a state of spreading substantially in the vertical and horizontal directions. Then, the back plate surface 26 is formed in cooperation with the front surfaces of the back plate plates 64, 64, 64 of the three back plate structures 10, 10, 10 arranged vertically apart from each other. It has become.

  Here, the back plate 64 can be adjusted and set in tension by changing the support position in the longitudinal direction by separately operating the adjusting screws 72 and 72 respectively provided at the upper and lower portions. It has become. That is, in this embodiment, a connection means is comprised by this connection support mechanism.

  Further, by operating the connecting bolts 58 and 58 separately, the elevation angle and the overhead angle of the left and right channel fittings 74 can be arbitrarily adjusted and set, and the elevation angle and overhead angle of the left and right side portions of the back plate 64 can be independently set. It can be set.

  In addition to this, each back plate plate 64 is provided with belt latching portions 76, 76, 76 at the center portion in the longitudinal direction and at the left and right side portions near the upper edge portion and near the lower edge portion, respectively. . Further, each metal plate 52 arranged opposite to the back of the back plate 64 with a predetermined distance is also provided with a belt lock at a position corresponding to each belt lock 76, 76, 76 near both upper and lower edges. Holes 78, 78, 78 are formed. The traction belts 80 are respectively mounted across the six belt locking portions 76 of the corresponding back plate plates 64 and the belt locking holes 78 of the metal plate 52.

  The pulling belt 80 is advantageously configured by Velcro tape or Velcro tape (trade name), and the length can be arbitrarily adjusted and set.

  Then, by tightening a plurality of portions of the backplate plate 64 with the metal plate 52 with the plurality of traction belts 80, each portion within the range of the amount of curvature allowed by the tension applied to the backplate plate 64 is mutually connected. A complicated and arbitrarily settable shape with different radii of curvature is provided. In the drawing, a curved shape having a substantially constant radius of curvature is shown in the longitudinal direction as a whole. However, by making the lengths of the three traction belts 80 different from each other in the longitudinal direction, for example, It is easy to understand that the radius of curvature of the backplate plate 64 can be made partially different by setting the length of the traction belt 80 at the right end shorter than the length of the traction belt 80 at the left end. It is where it is done.

  In addition, in the present embodiment, since the traction belts 80 are independently provided at the upper and lower end edge portions, an arbitrary inclination can be given even in the width direction (vertical direction) of the back plate plate 64. In addition to the overall adjustment mechanism of the elevation angle and the overhead angle based on the rotation around the connecting bolt 58 as described above, the elevation angle at each part of the back plate 64 can be obtained even if the traction belt 80 is used. It is possible to appropriately adjust and set the overhead angle.

  Therefore, in the wheelchair 12 equipped with the back plate structure 10 having the above-described structure, the body profile formed by the individual shape such as a vertical S-shaped bend of the spine with the back of the body or a person with a circular back is formed. In addition to being able to adjust, it is possible to adjust the elevation angle and overhead angle of each divided surface and to respond to three-dimensional torsion of the body. Moreover, since the shape of the back plate 64 is fixedly set by the metal plate 52 and the traction belt 80 and is set with an arbitrary curved shape or an elevation angle or an overhead angle, it is disclosed in the aforementioned Patent Documents 1 to 4. Unlike a passive chair that uses the body pressure of a user (sitting person) like a conventional chair, it is possible to positively set a fixed shape.

  Therefore, the shape of the back plate corresponding to the body shape of each user can be easily formed with high accuracy, and the seating posture of the user can be effectively supported by the fixed surface shape. Is possible.

  In the present embodiment, the back plate 64 can be attached by covering the front surface of the back plate 64 with a back cushion (not shown) formed of urethane foam or various cushion materials. Even if there is a difference in the shape or the like of the plates 64, it can be softened to give a soft feel to the whole.

As described above, the mechanism described below has the following function of adjusting the spatial position of the backrest surface in contact with the body. First, the depth at the backrest surface, the elevation angle, the overall position in the left-right direction, the height from the seating surface, the twisted shape, the curvature in the horizontal direction by adjusting the tension from the left and right four positions of the soft backrest surface, It is possible to adjust the partial curvature with the traction belt, and various support surfaces can be realized by changing the shape of the back plate plate 64 made of soft synthetic resin plate. It can be done. The characteristics are shown below again.
(1) Change of the depth of the backrest surface with one of the support surface position adjustment mechanisms having 5 degrees of freedom (2) Angle of the backrest surface with respect to the sagittal surface with one of the support surface position adjustment mechanisms with 5 degrees of freedom (3 ) The amount of lateral movement of the backrest surface relative to the chair body with one of the support surface position adjustment mechanisms having 5 degrees of freedom. (4) One of the support surface position adjustment mechanisms with 5 degrees of freedom of the unit (back plate structure 10). Height from the seat surface (5) Elevation angle of the backrest surface formed on the unit (backboard structure 10) in one of the support surface position adjustment mechanisms having 5 degrees of freedom (6) The backrest surface formed on the unit The mechanism that makes the value of the radius of curvature of the horizontal cross section of the support surface by adjusting the length of the support surface in the left-right direction. Mechanism to change by doing

  In other words, in the present embodiment, the seven adjustment mechanisms are all or partly combined to provide a mechanism for highly realizing rear body adaptation.

  As mentioned above, although one embodiment of the present invention has been described in detail, this is merely an embodiment, and the present invention is not construed as being limited by the specific description in the embodiment.

  For example, in the present invention, the support surface by the back plate can be freely set along the body, and the three-dimensional torsion can be adjusted in addition to the adjustment of the inclination amount in the vertical direction. It is possible to employ a mechanical belt tension adjusting mechanism such as a screw mechanism as well as a cloth belt type adjusting method such as a magic tape as a traction belt.

  Moreover, although the specific example of what was applied to the wheelchair was shown in the said embodiment, this invention can be applied with respect to various chairs, such as an easy chair, a work chair, a car chair, and a seat chair. it can.

  In addition, although not enumerated one by one, the present invention can be implemented in an embodiment to which various changes, modifications, improvements, etc. are added, and any such embodiment can be used as long as it does not depart from the gist of the present invention. It goes without saying that it is included in the scope of the invention.

It is explanatory drawing of the use condition which shows the side surface of the wheelchair as one Embodiment of this invention. It is a perspective view which shows the backplate structure in the wheelchair shown by FIG. FIG. 3 is an explanatory plan view of the back plate structure shown in FIG. 2. It is side surface explanatory drawing of the backplate structure shown by FIG. FIG. 3 is an explanatory rear view of the back plate structure shown in FIG. 2. It is side surface explanatory drawing which notches and shows a part of back board structure shown by FIG. It is front explanatory drawing which shows the edge part structure of the backplate structure shown by FIG. It is a plane explanatory view in FIG. It is a cross-sectional explanatory drawing of the backplate plate equivalent to the IX-IX cross section in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Back board structure 12 Wheelchair 14 Seat frame 16 Back frame 24 Vertical rod 26 Back board surface 30 Base member 38 Clamping bolt 42 Supporting spindle 46 Tightening fixture 52 Metal plate 58 Connection bolt 62 Tightening bolt 64 Back board plate 66 Connecting bracket 72 Adjustment screw 74 Channel bracket 80 Traction belt

Claims (8)

A back plate structure for a chair that forms a backrest surface by being attached to a back frame projecting so as to extend upward from a seat frame,
A plurality of rigid support bases each having a split structure attached to a plurality of different locations in the height direction of the back frame and extending in the left-right direction;
A fixing means capable of positioning and fixing the plurality of supporting base materials so as to be positionally adjustable with respect to the back frame;
A plurality of flexible back plate plates that are spaced apart in front of each of the support bases and are arranged to extend in the left-right direction with a predetermined width with a strip shape;
Both end edges in the longitudinal direction of the respective back plate plates are connected to and supported by the respective support base materials, and the support base material of the back plate at the at least one end edge in the longitudinal direction of the back plate plate. A connecting means for adjusting the connecting position with respect to the longitudinal direction of the back plate so that the connecting position can be adjusted in the left-right direction;
And a traction means for holding the back plate plate in a deformed state by tightening the back plate plate with respect to the support substrate at a plurality of locations in the longitudinal intermediate portion of each back plate. Chair backboard structure.   2. The chair backboard structure according to claim 1, wherein the fixing member is capable of adjusting the position of the support base material in any of a height direction, a left-right direction, and a front-rear direction with respect to the back frame.   The back plate structure for a chair according to claim 1 or 2, wherein an elevation angle with respect to the support base material at an edge portion in a longitudinal direction of the back plate is adjustable by the connecting means.   The chair backboard structure according to claim 3, wherein different elevation angles can be set independently from each other at both longitudinal ends of the backboard plate by the connecting means.   The connecting means is capable of independently adjusting the connecting position of the back plate with respect to the support base in the upper part and the lower part of the back plate, and the tension exerted in the longitudinal direction of the back plate The back plate structure for a chair according to any one of claims 1 to 4, wherein the back plate structure can be adjusted to be different from each other at both side edges in the width direction of the back plate.   The chair backboard structure according to any one of claims 1 to 5, wherein the pulling means is provided near both end edges in the width direction of the backboard plate.   The back plate structure for a chair according to any one of claims 1 to 6, wherein the back plate is formed of a synthetic resin material that is elastically deformable but does not substantially expand and contract. A back frame that protrudes upward from the seat frame is provided, and at least three chair backboard structures according to any one of claims 1 to 7 are attached to the back frame. Further, a backrest substrate surface is formed in cooperation with the backplate plate in the chair backplate structure.

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