JP6533394B2 - Chair - Google Patents

Description

The present invention relates to body pressure supporting surface of the well back to the chair element constituting a flexible sheet material. The flexible sheet material includes various materials typified by mesh materials such as woven fabrics and knitted fabrics.

  In a chair, it is widely practiced to make a backrest and a seat a looped frame material and a flexible sheet material such as a mesh material (net material) stretched. In that case, as one of methods for attaching the flexible sheet material to the frame material, as disclosed in, for example, Patent Document 1, a tape-like edge member is fixed by sewing or the like to the periphery of the flexible sheet material. In some cases, this edge member is fitted into a groove (long groove) formed on the outer periphery of the frame material.

However, in the configuration in which the edge member is fitted to the outer periphery of the frame material in this way, about half a circumference of the flexible sheet material can be easily fitted to the groove, but as the flexible sheet material is attached, the flexible sheet a force stretching against the wood on the elasticity becomes stronger, forcibly not a pull Shin Basanebanara a flexible sheet material to fit the last piece, Thus, the work of attaching the flexible sheet material It was very troublesome.

  Therefore, in the patent document 2, the applicant of the present application attaches a part of the outer periphery of the flexible sheet material to the second edge member of the rigid body structure in a pivoting manner, and first, the second of the outer periphery of the flexible sheet material. After attaching the first edge member fixed to the portion excluding the edge member to the frame material, the flexible sheet material is held in a taut state by rotating the second edge member to a predetermined posture. Disclosed a possible chair.

Unexamined-Japanese-Patent No. 2006-110000 JP, 2013-244253, A

  According to Patent Document 2, in the state in which the second edge member is turned to the surface side of the flexible sheet material, the flexible sheet material is in a slack state, so the first edge member to the frame material The second edge member can be pivoted with a light force using the lever principle. Therefore, the flexible sheet material can be easily attached. In addition, since the flexible sheet material can be easily tensioned, the quality of the chair can be improved.

  The present invention is a further improvement to the prior invention, and aims to make the mounting operation easier.

The chair of the present invention is
Comprise a flexible sheet material for receiving the body pressure of Regachaku seat's was also "back, said flexible sheet material is mounted substantially at the entire periphery on an annular seat frame, the seat frame , Is attached to the back frame placed behind it,
And, to the seat frame, the bending portion from the reference position to be used as a chair may be rotated to the side of the seated person's body pressure is applied surfaces and forms the shape of and rotates the bent portion on the surface side by flexible sheet material is loosened, the when the bent portion to the reference position, the flexible sheet material to a predetermined tension is applied "
It is the basic composition of.

  Here, "predetermined tension" means tension appropriate for use as a chair, and does not mean a specific number. Since the tension strength of the flexible sheet material varies depending on the preference among people, it is possible to prepare a chair with different tension strength of the flexible sheet material, in this case , "Predetermined tension" will be different.

The present invention further relates to the above basic configuration,
"The backrest has a structure in which a flexible sheet material is stretched on the seat frame, and the lower portion of the seat frame is the bent portion.
Furthermore, the seat frame and the back frame are seated on the flexible sheet member by forming the seat frame and the back frame in a forwardly convex shape in a side view so as to be most forward at the height position of the seat occupant's waist. A lumbar support that supports the lower back of the person, and the lower part of the seat frame is a bend, and the pivot point of the bend is located above the apex of the lumbar support ing"
It has the composition.

The invention of claim 2 is characterized in the structure for attaching the flexible sheet material to the seat frame, and in claim 1 ,
" The outer peripheral part of the flexible sheet material is wound on the back side of the seat frame from the outer peripheral outer side, and the outer peripheral part of the flexible sheet material is attached to the back side of the seat frame "
It has the composition.

In the present invention, since the flexible sheet material and the seat frame constitutes a single body pressure support unit, shea over preparative frame, for example using engagement means such as catch system, the other members such as the back frame It can be easily attached (mounted) in an overlapping manner. That is, it is possible to attach in a tactile manner. Therefore, the enable assembly of the even back easy replacement of the flexible sheet material is easy.

Also, since in the state in which rotates the bent portion on the surface side loose flexible sheet material, the attachment of the flexible sheet material of the seat frame also easily with high dimensional accuracy.

In applying the backrest, a flexible sheet material is intended to adopt a configuration for mounting the back frame, since the conventional basic structure is similar, the bent portion provided in the design to be advantageous (back frame Although it is possible to attach a flexible sheet material to the back frame itself, in this case, there is a risk that the calculation of strength and the like will be troublesome and the design will take time and effort).

When mounting the seat frame to the back frame and the lower or upper or top and bottom of the sheet over preparative frames constituting the bent portion, for at least the right and left side portions of the seat frame can firmly attached to the back frame, the supporting stability that is excellent.

Although the backrest often has a lumbar support portion projecting forward, since the flexible sheet material has a three-dimensional shape at the lumbar support portion, a strong tension is applied. Then, in the present invention, it constitutes a lower portion of the seat frame to the bent portion, that the pivot point than the apex of the lumbar support portion and is positioned on the upper side, in a state in which rotates the flexion bends on the surface side Since the flexible sheet material is in a slack state as a whole, the attachment of the flexible sheet material to the seat frame can be more reliably performed with high dimensional accuracy, and the seat frame It also improves the ease of attaching it to the

  Therefore, although it is a chair provided with a lumbar support portion, high tension is applied to the flexible sheet material at the location of the lumbar support portion while being used as a chair while securing the ease of manufacturing and assembling the backrest. Can maintain high quality.

  Furthermore, when attaching the seat frame to the support member behind it, if tension is applied to the flexible sheet material, the tension also spreads to the seat frame, and the lateral distance of the seat frame is larger than the reference dimension. A narrowing phenomenon occurs, which may make it difficult to attach the seat frame. However, according to the configuration of claim 3, since the elastic deformation of the portion of the seat frame above the bending portion can be prevented or suppressed, Attaching the seat frame to the back frame using a method or the like can also be performed accurately and easily.

As in the second aspect , when the flexible sheet material is wound on the back side of the seat frame from the outer periphery outside, the surface of the seat frame facing the seated person is hidden by the flexible sheet material, so that the appearance is excellent. In addition, since the outer peripheral portion of the flexible sheet material is bent in a U-turned state, there is an advantage that the flexible sheet material is held in a state in which the flexible sheet material is not easily detached from the seat frame.

(A) is a perspective view which shows the external appearance of the chair which concerns on embodiment, (B) is a perspective view in the state which abbreviate | omitted the flexible sheet material and the seat cushion. (A) is a perspective view showing a framework of a backrest, (B) is a side view of a chair. (A) is a separation perspective view of a main member of a chair, (B) is a separation perspective view of a back and a pressing member, and (C) is a perspective view of the pressing member seen from below. It is a separation perspective view of a back frame and a seat frame, and (A) is a figure in the state where a bent part is made into a use posture, and (B) is a figure where a bent part is rotated to the front. (A) is a separation perspective view of a back frame and a seat frame , (B) is a partial perspective view of a back frame. It is a figure which shows a seat frame , (A) is a perspective view seen from the back side, (B) is a perspective view in the state where a bent part was removed. It is a rear view of a flexible sheet material. (A) is a separation side view of a seat frame and a back frame, (B) is a perspective view of a seat frame in the state where a bending part was rotated. (A) is a cross-sectional view of the backrest as viewed from the direction of IXA-IXA in FIG. 7, (B) is a cross-sectional plan view of the backrest as viewed from the direction of IXB-IXB in FIG. It is a vertical side view of the center part of the lower part of a backrest. (A) is a perspective view of the back frame as viewed from the rear, (B) is a partial perspective view of the back frame with the upper cover removed, and (B) is a perspective view of the upper cover.

  Next, an embodiment of the present invention will be described based on the drawings. In the present application, front and back, and left and right words are used to specify a direction, but these words are based on a state in which a person who normally sits on a chair is facing. The front view is a state viewed from the direction opposite to the person sitting on the chair.

(1). Outline of Chair First, an outline will be described based on FIGS. The chair of this embodiment is a rotary chair widely used for office work, and the chair is a leg device 1 having a leg support as a gas cylinder, a base 2 supported by the leg device 1, and a base 2 It has a seat 3 arranged above and a backrest 4 on which the seated person can lean. The base 2 is made of sheet metal, and as shown in FIG. 3 (A), has a box-like form opened upward.

As shown in FIG. 1A, the seat 3 has a structure in which a seat cushion 6 is stretched on the upper surface of a seat inner shell 5 made of resin, and the rear portion of the seat inner shell 5 rotates downward. as described above, to form a hinge portion 5a behind side portion. That is, of the seat inner shell 5, a portion on the front side of the hinge portion 5a is slidably mounted on the base 2 back and forth, and on a portion of the seat inner shell 5 on the front side of the hinge portion 5a Is attached from.

  As clearly shown in FIG. 4, the backrest 4 includes a seat frame 8 that opens in the front and back, and a back frame 9 that supports the seat frame 8 from behind, and the seat frame 8 is a flexible sheet material 10 such as a mesh material. Is covered. Accordingly, the back frame 9 is a strength member supporting the body pressure, and the seat frame 8 is attached thereto. The seat frame 8 can also be called an inner frame or a front frame, and the back frame 9 can also be called an outer frame or a rear frame.

  The seat frame 8 and the back frame 9 respectively include upper and lower long side members 8a, 9a, upper members 8b, 9b connected to the upper ends thereof, and lower members 8c, 9c connected to lower ends of the left and right side members 8a, 9a. It has a trapezoidal shape (generally square shape) slightly narrowed in a front view. Although both the seat frame 8 and the back frame 9 adopt resin molded products, it is also possible to adopt aluminum die-cast products and sheet metal products.

The lower member 9c of the back frame 9 is integrally formed with a pair of left and right arm portions 11 extending toward the front, and a laterally long pin (not shown) inserted into the front end of the left and right arm portions 11 is a base A portion of the seat inner shell 5 slightly in front of the hinge portion 5a is fixed to the slider which is fitted in the front and rear long holes formed in 2 and through which the pin is inserted. The back frame 9, Ru are guides in the base 2 as the arm portion 11 while tilted backward to move forward.

  The rear end of the seat inner shell 5 is connected to the lower members 8 c and 9 c of the back frame 9. Therefore, when the backrest 4 tilts backward, the seat 3 bends while moving forward while the seat 3 advances. The rearward tilt of the backrest 4 and the forward movement of the seat 3 are performed against the spring built into the base 2. The lower member 9 c and the arm portion 11 of the back frame 9 form a large number of reinforcing ribs.

(2) Details of Backrest Next, the details of the backrest 4 will be described with reference to the drawings from FIG. Each member 9a to 9c of the back frame 9 basically has a channel structure (a grooved structure) that opens forward, and the seat frame 8 is disposed in such a state as to close the groove of the back frame 9. ing.

  Specifically, as shown in FIG. 9, the upper members 9b and the side members 9a of the back frame 9 have a convex shape in the backward direction, and as shown in FIG. 10, the lower members of the back frame 9 9c has a substantially U-shaped cross-sectional shape. The lower members 8c and 9c of the back frame 9 are larger in width (upper and lower width) than the other members, because a large load is applied.

  As shown in FIGS. 3 and 10, a metal holding member 12 is fixed to the lower member 9c of the back frame 9 with a screw (not shown). The pressing member 12 functions to press the lower member 8 c of the seat frame 8 from the front side, and to restrict the retracted position of the seat 3. As shown in FIGS. 3B and 3C and FIG. 10, the left and right end portions of the pressing member 12 are provided with protruding pieces 14 that contact the lower member 8c of the seat frame 8 from the front and the top. Accordingly, the seat frame 8 is held immovable upward.

  For example, as can be understood from FIG. 5, each member of the seat frame 8 basically has a plate-like structure, and a thick centering protrusion 13 is provided on only the left and right middle portions of the upper member 8b. ing. Further, as shown in FIGS. 7, 9 (B) and 10, an edge member 15 such as a resin sheet is fixed to the periphery of the flexible sheet material 10 by means such as sewing, and the edge member 15. Is caught from the outside of the outer periphery of the seat frame 8 and overlaps the back surface of the seat frame 8.

  As shown in FIGS. 11 (A) and (B), the rear surface of the upper member 9b in the back frame 9 is a stepped portion 16 which is turned to the front side and the lower side. The holder portion 17 to which a hanger or the like can be attached is integrally formed. Usually, the holder portion 17 is covered by the upper cover 18 from behind and below.

  Further, as shown in FIG. 9A, the center projection 13 of the seat frame 8 penetrates the step portion 16 from above. For this reason, the positioning hole 19 in which the center protrusion 13 fits is vacant in the step part 16. For this reason, the upper member 8 b of the seat frame 8 is held by the upper member 9 b of the back frame 9 so as not to be displaced in the front-rear direction.

  Further, the upper cover 18 is provided with a claw 20 which is fitted to the center projection 13 of the seat frame 8 from the rear. For this reason, the seat frame 8 is also held by the upper cover 18 so as not to shift upward. The center projection 13 can also be called a positioning projection, and may be provided not only at the left and right middle portions but also at other portions. The number can also be set arbitrarily.

For example, as shown in FIG. 7, the edge member 15 is fitted in a stopper projection 21 which is intermittently provided on the back surface of the seat frame 8. Accordingly, the edge member 15 is formed with a group of engagement holes 22 that fit into the stopper projection 21.

  In addition, the edge member 15 does not need to be sheet-like, for example, it is also possible to use a metal wire material. Alternatively, various methods can be adopted as a fixing means of the flexible sheet material 10, such as, for example, the periphery of the flexible sheet material 10 is tacked to the seat frame 8 with a tacker. In the case of stopping with the tacker, the flexible sheet material 10 may be directly pressed or may be fixed via a pressing plate.

  As means for attaching the seat frame 8 to the back frame 9, in the present embodiment, as shown in FIGS. 5, 6, 9 (B), etc., the hook-like locking claws 23 are provided downward on the side members 8a of the seat frame 8. On the other hand, the side members 9a of the back frame 9 are provided with catches 24 which are opened up and down, and the engaging claws 23 are fitted in the catches 24. The catches 24 are formed in such a manner as to fill the grooves of the side members 9a, and thus also play a role as reinforcing ribs for the side members 9a.

Of the side member 8a of the seat frame 8, a portion between the engaging claws 23 which are neighboring in the vertical direction, while being protruded rearward positioning ribs 23 'of the narrow, lateral side members 9a of back frame 9 The positioning groove portion 24 'is formed in which the positioning rib 23' is inserted. The stopper projection 21 is disposed between the engagement claw 23 and the positioning rib 23 '. Needless to say, the edge member 15 is formed so as not to hit the engaging claw 23 and the positioning rib 23 '(the engaging claw 23 and the positioning rib 23' are formed from the holes provided in the edge member 15). May be exposed).

  As shown in FIG. 9B, the side members 9a of the back frame 9 are V-shaped expanding toward the front, and therefore, when the side members 8a of the seat frame 8 are fitted, the engaging claws 23 form the back frame 9 Guided automatically towards the back of the ditch. Therefore, when the side members 8a of the seat frame 8 are overlapped with the side members 9a of the back frame 9 and shifted downward, the engaging claws 23 are smoothly attracted to the catch portion 24. Therefore, the seat frame 8 can be attached easily and accurately by one touch.

As best shown in FIG. 8 (A), the and the back frame 9 and the seat frame 8, so that the height per the seated person's waist is located foremost, bent in the form of a forward collision in side view Thus, the flexible sheet material 10 is provided with a lumbar support portion for supporting the pelvic region of the seat occupant (particularly, around the third lumbar spine) from behind. Although the lumbar support portion is formed on the flexible sheet material 10, for convenience, the forward projecting portions of the seat frame 8 and the back frame 9 are also referred to as lumbar support portions and denoted by reference numerals 25 and 26.

  Both the upper members 8b and 9b and the lower members 8c and 9c are curved forward in a plan view in the forward direction in the seat frame 8 and the back frame 9. For this reason, the flexible sheet material 10 is also curved so as to be concave in a plan view forward over the entire height.

  For example, as shown in FIGS. 6-8, the seat frame 8 is divided up and down at a position slightly above the apex of the lumbar support portion 25, and the entire lower member 8c and the lower end portions of the left and right side members 8a , And the bent portion 27 described in the claims. The left and right ends of the bent portion 27 are provided with bearing claws 28 opened forward and protruding upward, while the lower ends of the remaining portions of the left and right side members 8a are horizontally long pivots via left and right backward facing ribs 29. A bearing claw 28 is fitted on the support shaft 30 from behind. Accordingly, the pivot point (or connecting portion) of the bending portion 27 is located slightly above the lumbar support portion 25.

As shown in FIG. 6 (A), the rear surface of the bearing pawl 28 has a semicircular shape in a side view, while the side member 9a of the back frame 9 has a bearing pawl as shown in FIG. 28 has a recess 31 is formed to penetrate and thus, the bearing pawl 28 is held so as not to escape from the support shaft 30. Also, the bearing claws 28 can be rotated about the support shaft 30 inside the recess 31.

In the above-described configuration, the seat frame 8 can attach the portion excluding the bending portion 27 to the back frame 9 in a posture in which the bending portion 27 is pivoted to the front side (bent), and further, the bending portion 27 can be a by Rukoto is rotated downward, back to a predetermined in position.

And since the flexible sheet material 10 is slack in the state which rotated the bending part 27 in front, while being able to attach the flexible sheet material 10 to the seat frame 8 can be performed very easily, Attachment of the seat frame 8 to the back frame 9 can also be easily performed. On the other hand, after attaching the seat frame 8 to the back frame 9, when the bending portion 27 is turned back to the reference posture to be used as a chair, the flexible sheet material 10 can be tightened with a pin and the seat occupant can be properly supported. . The pivoting operation of the bending portion 27 can be easily performed with a light force using the principle of leverage.

  In the present embodiment, the seat frame 8 is attached to the back frame 9 and the bending portion 27 is rotated to return to a predetermined posture, and then the pressing member 12 is fixed to the lower member 9 c of the back frame 9 with a screw. Then, the bending portion 27 is held so as not to be pivotable toward the front, and the seat frame 8 is held so as not to be able to move upward as a whole. As can be understood from FIG. 1B, since the pressing member 12 is hidden below the seat 2 and can not be visually recognized, the appearance of the pressing member 12 is not deteriorated. Note that the bending portion 27 may be fixed to the back frame 9 with a screw instead of using the pressing member 12.

  Since the pivot point of the bending portion 27 is located near the top of the lumbar support 25, when the bending portion 27 is returned to the reference posture, the elastic force of the flexible sheet material 10 is It acts to hold the bending portion 27 in the reference posture. The body pressure of the seated person also acts to hold the bending portion 27 in the reference posture. Therefore, as a means for holding the bent portion 27 in the reference posture, a catch method of the engagement claw and the engagement hole may be used.

(3). Others The present invention can be embodied variously in other ways. For example, it is also possible to form a bending part in the upper part of a seat frame, or to form in two places of an upper part and a lower part. Alternatively, it is also possible to make the seat frame into a two-fold view in a side view with the bending portion at the mid-upper and lower height position as a fulcrum. Alternatively, it is also possible to bend the seat frame in the vertical direction around a long axis (that is, to bend it in two in a plan view).

  The seat frame and the back frame are not limited to the loop structure, and may be a shell structure. The point is that deformation of the flexible sheet material may be acceptable. Therefore, the seat frame may be provided with an annular portion to which the flexible sheet material is attached.

  The present invention is practically applicable to a chair. Therefore, it can be used industrially.

2 base 3 seat 4 backrest 8 backrest sheet over preparative frame 8a side members 8b upper member 8c lower member 9 back back frame 9a side member 9b upper member 9c lower member 10 the flexible sheet material (mesh)
12 pressing member 15 edge member 21 stopper projection 22 engagement hole 23 engagement claw 24 catch portion 27 bent portion 28 bearing claw 30 support shaft

Claims (2)

Comprise a flexible sheet material for receiving the body pressure of the back was also Regachaku seat's said flexible sheet material is the substantially entire circumference is attached to an annular seat frame, the seat frame, It is attached to the back frame placed behind it,
And, to the seat frame, the bending portion from the reference position to be used as a chair may be rotated to the side of the seated person's body pressure is applied surfaces has multiple form, rotates the bent portion on the surface side The flexible sheet material is slackened, and when the bent portion is in the reference posture, a predetermined tension is applied to the flexible sheet material ,
The backrest has a structure in which a flexible sheet material is stretched on the seat frame, and a lower portion of the seat frame is the bent portion.
Furthermore, the seat frame and the back frame are seated on the flexible sheet member by forming the seat frame and the back frame in a forwardly convex shape in a side view so as to be most forward at the height position of the seat occupant's waist. A lumbar support that supports the lower back of the person, and the lower part of the seat frame is a bend, and the pivot point of the bend is located above the apex of the lumbar support ing,
Chair. The outer peripheral portion of the flexible sheet material is wound from the outer periphery on the back side of the seat frame, and the outer peripheral portion of the flexible sheet material is attached to the back surface of the seat frame.
A chair according to claim 1.

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