JP2014140765A5 - - Google Patents

Description

Chair with backrest

The present invention backrest to a flexible support sheet (net-like material, a mesh-like material, is referred to as a mesh material is also possible) relates lumbar support function chairs that are using the.

In a chair, for example, so that it has been exemplified in Patent documents 1 and 2, in the support sheet is stretched structure of the net-shaped backrest or seat to a frame (or mesh-like), with support sheet body of the user It is done. The advantage of using the support sheet to the seat and backrest, and that has excellent breathability, suitable elasticity can be cited terms of excellent cushioning there.

  On the other hand, in chairs, in recent years, the importance of supporting the user's lumbar part (particularly the part centered on the third lumbar vertebrae) from behind has been recognized. It is common to provide a curved lumbar support.

  The backrest using a net-like support sheet is also provided with a lumbar support function. In this case, basically, the back of the back frame on which the support sheet is stretched The lumbar support part is formed in the support sheet by making the part located in the contact curved in a convex shape in a side view, but in order to exert the lumbar support function more strongly, on the back side of the support sheet The pressing means (pressing member) is also arranged so that the height can be adjusted. An example thereof is disclosed in Patent Document 1.

JP 2004-49658 A JP 2002-119366 A

By the way, although patent document 2 is provided with the press member which presses a net-shaped support sheet, this press member is arrange | positioned in the state which spreads greatly on the back side of a support sheet. On the other hand, the back of the net-like support sheet can be seen through even if there is a difference in degree. For this reason, when a pressing member is arranged on the back of the net-like material as in Patent Document 2 , this is the front. It can be seen through and can be completely exposed from the back side. However, when the pressing member is too conspicuous, there is a problem that the appearance is not always good.

The present invention has been made in view of such circumstances, is to St. provide lumbar support mechanism that is more improved.

The present invention has a seat and a backrest, and the backrest has a structure in which a flexible support sheet is stretched on a back frame having front and rear closed side members having left and right side members that are vertically long, The lumbar support part that hits the lumbar part of the person seated in the support sea heel is supported from the back by two left and right lumbar pads, and the left and right lumbar pads are located closer to the side member than the left and right middle part of the backrest Is arranged.

The invention of claim 2 is a preferred development of claim 1 , wherein the front surfaces of the left and right lumbar pads are curved in a forward projecting shape in both a side view and a plan view. .

According to a third aspect of the present invention, in the first or second aspect, the left and right lumbar pads are long in the vertical direction.

  In the present invention, since the pressing means for pressing (supporting) the lumbar support portion of the backrest is separated into the left and right lumbar pads, the lumbar pads are not so conspicuous in the back view of the chair, and are therefore excellent in aesthetics.

In particular, even materials show through support sheet, since lumbar pad will not be noticeable at the front view of the chair (front view), and as it can be formed as designed and refreshing as a whole chair, thus In addition, it can be said that the present invention is more effective when a mesh-like support sheet is used .

  Well, the seated person's waist and back naturally hit the backrest, but generally the width of the backrest is set to be larger than the width of the human torso. Often not in contact. In addition, a person's back and waist are rounded in plan view, and even when viewed from this plane, the left and right sides of the backrest are often not in contact with the person.

  Conventionally, the pressing member that supports the lumbar support portion is often arranged at a portion where the human body hits the backrest. For this reason, the human back or waist often hits the pressing member via the backrest. . In this case, when the backrest has a structure in which the cushion is stretched on the inner shoulder, the pressing member rarely gives a feeling of pushing up to the human body, but when the backrest is a support sheet type, the support sheet is thin, so the pressing member The hit feeling will be transmitted to the human body, and there is a concern that it may give a sense of incongruity.

On the other hand, in the present invention, the pressing means is composed of left and right lumbar pads, and the lumbar pads can be arranged at the left and right end portions of the backrest where the human body hardly hits. It is possible to obtain a comfortable feeling of use by preventing or remarkably suppressing the hit feeling.

When the backrest is of the support sheet type, the support sheet may be easily torn when the load is concentrated on a narrow portion. In this respect, if the lumbar pad is rounded in both the side view and the plan view as in claim 2, the contact area between the support sheet and the lumbar pad can be increased and the degree of bending of the support sheet can be increased. The durability of the support sheet can be improved. Further, since the frictional resistance can be reduced when the lumbar pad is moved up and down, operations such as up and down of the lumbar pad can be performed smoothly.

By adopting long in the up and down as according to claim 3 as the shape of the lumbar pad, there is an advantage that can be kept in proper tension state over a long range support sheet vertically. In addition, the use of a long shape at the top and bottom makes the contact area between the lumbar pad and the support sheet larger without telling the user that the lumbar pad is touching, which is particularly excellent in terms of ensuring the durability of the support sheet. .

There are various ways to attach the support material to the back frame, but when the support sheet is attached to the outer end surface of the side member (back frame) as in the embodiment , the area of the backrest as viewed from the front is directly applied to the body by the support sheet. Since it can be used as a supporting area, there is an advantage that a person with a large shoulder width can be stably supported. Furthermore, the lumbar pad can be arranged as close to the left and right outside of the backrest as much as possible without impairing the support function of the support seat. From this aspect as well, the user is prevented from receiving a feeling of hitting the lumbar pad. A comfortable feeling can be obtained.

(A) is a perspective view of the chair which concerns on embodiment, (B) is a partially broken front view of the backrest. It is a side view of a chair. It is a rear view of a chair. It is the isolation | separation perspective view seen from the front. It is the isolation | separation perspective view seen from the front. It is a separation perspective view for explaining a locking mechanism. (A) is a side view of the back frame, (B) is a plan view of the lumbar pad, and (C) is a front view of the lumbar pad. (A) is the isolation | separation side view of the principal part, (B) is the isolation | separation perspective view of the principal part. (A) is a perspective view of the upper part of a back support | pillar, (B) is a fractured perspective view of the side member in a back frame. (A) is a partial side view in a non-locking state, (B) is a partial side view in a locking state. FIG. 11 is a cross-sectional view taken along the line XI-XI in a state where the lumbar pad is slightly shifted downward in FIG. 10. It is a figure which shows 2nd Embodiment.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a swivel chair often used for office work. First, FIGS. 1 to 11 show the first embodiment, and FIG. 12 shows the second embodiment. In the following description, the left and right words for specifying the direction are used, but the left and right directions are based on the direction in which the seated person faces. First, the first embodiment will be described.

(1). Outline of First Embodiment First, an outline of a chair according to the first embodiment will be described with reference to FIGS. 1A is a perspective view of a chair, FIG. 2B is a partially broken front view of a backrest, FIG. 2 is a side view, FIG. 3 is a rear view, and FIGS. 4 and 5 are viewed from the front. FIG. 6 is an exploded perspective view for explaining the locking mechanism.

For example, as shown in FIGS. 1 to 3, the chair is disposed above the base 3 as a main element, a leg device 1 having a leg column 2 (gas cylinder), a base 3 fixed to the upper end of the leg column 2, and the base 3. A seat 4, a backrest 5, and a headrest device 6 attached to the backrest 5 as an optional item are provided. The leg 1 includes a plurality of branch legs 7 extending radially, and a caster is provided at the tip of each branch leg 7.

A pair of left and right swing frames 8 are arranged on the left and right sides of the base 3. Swing frame 8, a base 9 that is tilted backward in a posture which is nearly horizontal at the time of non-locking, is made from the back posts 10 for rising from its rear end. The swing frame 8 has a front end portion of the base portion 9 connected to the base 3 by a left and right support shaft portion 11 so as to tilt backward (turn) around the front end portion. Swing frame 8 is, for example, a metal molded article is adopted as aluminum die-casting, may be the resin molded product, or it is also possible to employ a sheet metal product. The left and right swing frames 8 are connected by a joint frame 11 at a corner where the base 9 and the back column 10 are connected.

The backrest 5 has a configuration the support sheet 14 to the back frame 13 in front view substantially square stretched, back frame 13, the posts 10 of the swing frame 10 is fixed by screws (details will be described later.) . The back frame 13 is gently curved in the side view so that the portion corresponding to the waist of the seated person is the front end in the side view. Therefore, the support seat 14 (or the backrest 5) has the lumbar support portion 14a. Yes. The lumbar pad 14 is in contact with the left and right sides of the lumbar support portion 14a of the support sheet 14 from the back side. The support sheet 14 is recessed in a forward concave shape in plan view. Further, the support sheet 14 of this embodiment has an appearance of sparse portion and the stripes of the dense portion are alternately arranged in the lateral direction of the portrait, the sparse portion seen through the front and rear.

The back frame 13 is a resin molded product. For example, as shown in FIG. 4, left and right side members 13 a extending in the vertical direction, upper members 13 b connected to the upper ends of the left and right side members 13 a, and lower ends of the left and right side members 13 a It consists of the lower member 13c connected to. Therefore, the back frame 13 has a substantially rectangular shape when viewed from the front. Upper member 13b and the lower member 13c is curved loosely forward concave in plan view.

As already mentioned, the swing frame 10 has been connected with the support shaft 11 on the base 3 so as to tilted backward around the front end portion thereof, in this embodiment, as the spring means for locking the support shaft A torsion bar (not shown) built in the unit 11 is employed. Torsion bar, its has right and left middle portion is held unrotatable in the base 3, the left and right end portions are fixed to the front end portion of the swing frame 8. For this reason, the swing frame 8 tilts backward while twisting and deforming the torsion bar.

The support shaft portion 11 protrudes greatly on the left and right outer sides of the base 3, and for this reason, the swing frame 8 is also arranged considerably outside the base 3. However, as can be understood from FIG. 3 (B), the swing frame 8, it is located inside the left and right outer sides of the seat 4. Therefore , the swing frame 8 does not interfere with human walking.

The seat 4 has a resin inner shell (not shown), a cushion stretched on the upper surface thereof, and an outer shell 16 (see FIG. 6) for supporting the inner shell. The outer shell 16 of the seat 4 is attached to an intermediate member 17 disposed below the seat 4 so that it can be moved back and forth. The front bracket 18 is attached to the front of the intermediate member. The front bracket portion 18 and the base 3 are connected by a front link 20. The front link 20 is rotatably attached to a front support shaft 20 ′ inserted through the base 3. The upper end of the front link 20 is connected to the front and rear longitudinal auxiliary frame member 21. The auxiliary frame member 21 is held by the intermediate member 17 so as to be slidable back and forth, and the auxiliary frame member 21 moves integrally with the seat 4 (outer shell 19).

As shown in FIGS. 4 to 6, a rear link 22 is disposed on the inner side surface of the swing frame 10. The rear link 22 is in the form of a side view L-shaped similar to the swing frame 8, the standing portion 22a extends along the inner surface of the back posts 10 in the swing frame 8, and the rear link 22, standing A pivot pin 23 (see FIG. 4) at a position slightly in front of the base of the portion 22a. It is connected to the swing frame 8. The front end of the rear link 21 protrudes upward, and this is connected to the rear end portion of the auxiliary frame member 21 by a rear pin 24.

Therefore, when the backrest 5 (and the swing frame 8) tilts backward , the seat 4 tilts backward while moving backward. On the inner surface of the front / rear intermediate portion of the swing frame 8, there is a guide oblong hole that is slightly tilted backward with respect to the horizontal, while the intermediate member to which the seat 4 is attached has a guide oblong hole. Guide pins 25 (see FIGS. 5 and 7) that are slidably fitted are provided. By the guide pin 25 is guided by the guide slot, the seat 4, without its own retracted and tilted backward, interlocking relationship is enforced with the swing frame 8.

When the seated person leans against the backrest 5, the standing portion 22 a of the rear link 22 also tilts backward, but also tilts relatively backward with respect to the back column 10. That is, the rate at which the upright portion 22a of the rear link 22 tilts backward is greater than the rate at which the back column 10 tilts backward. And the lumbar pad 15 mentioned above is attached to the upper end part of the standing part 22a in the rear link 22 so that height adjustment is possible. Therefore, at the time of locking, the lumbar pad 15 retreats relative to the back column 10, and for this reason, when the support sheet 14 is locked, the tension is loosened.

Now, when a person performs work / work such as personal computer operation in a non-locking state, it is preferable that the upper body supports the lumbar part from behind by the lumbar support part 14a of the support sheet 14. Therefore, in a non-locking state, it is preferable that the lumbar support portion 14a protrudes considerably forwardly convex in a side sectional view. On the other hand, if the lumbar support part 14a is in a state of being largely protruded and is shifted to the locking state, the waist part may be excessively pushed up. Therefore, in this embodiment, at the time of locking, by relatively retracting the lumbar pad 15 with respect to the back posts 10 is're loosen the tension of the support sheet 14.

The headrest device 6 has left and right head columns 27 rising from the left and right inner surfaces of the side member 13a in the back frame 13 (only one head column 13b is shown in FIGS. 1A and 4). The headrest 28 is attached to the head column 27 so that the height can be adjusted.

Head strut 27 is connected to the side members 13a by a pin (or bin unit) to pivot back and forth around the site of the lower end closer, and the lower end of the head post 27, the rotary absorber 29 is connected to the upright portion 22 a of the rear link 22. At the time of locking, the head column 27 rotates so that the upper part thereof moves forward. Accordingly, the seated person has an advantage that the display of the personal computer can be easily viewed without raising his / her head while being in a locked state, and there is no need to lift the book when reading. Further, the rotation absorbing device 29 has a built-in spring, and the head column 27 can be tilted backward against the spring.

(2) Peripheral portion of lumbar pad Next, the peripheral portion of the lumbar pad 15 will be described with reference to the drawings in FIG. 7A is a side view of the back frame 13, FIG. 7B is a plan view of the lumbar pad 15, FIG. 7C is a front view of the lumbar pad 15, and FIG. 9A is an exploded perspective view of the main part, FIG. 9A is a perspective view of the upper portion of the back column 10, FIG. 10B is a cutaway perspective view of the side member 13a in the back frame 13, and FIG. A) is a partial side view in the non-locking state, (B) is a partial side view in the locking state, and FIG. 11 is a cross-sectional view taken along the line XI-XI with the lumbar pad 15 slightly shifted downward in FIG. . First, the swing frame 8 and the joint frame 12 will be described.

Swing frame 8 as described above is a molded article of aluminum, for example, as shown in FIG. 9 (A), the base 9 of the swing frame 8, its inside is formed in a generally trough-shaped and open inwardly Reinforcing ribs are provided. In addition, a rectangular hole 31 (see FIG. 4) that opens outward and slightly protrudes outward is formed in a substantially middle portion of the base 9 of the swing frame 8. The square hole 31 is for attaching an armrest device, and is closed with a cover 32 (see, for example, FIG. 5) when the armrest device is not attached.

For example, as shown in FIG. 6, the base 9 of the swing frame 8 is provided with a lower inside cover 34 for covering the rear link 22. For example, as clearly shown in FIGS. 9 and 11, the back column 10 includes a side plate 35 and a back plate 36. Although side plates 35 extends in the longitudinal direction in a plan view, the rear plate 36 is in the inclined as shifted back toward the center of the backrest 5 in flat cross section, therefore, the back pillar 10 is a flat cross section In FIG. A low inward front rib 37 is formed at the front end of the side plate 35 in the back column 10. Therefore, the inside of the side plate 35 has a shallow groove shape. A group of reinforcing ribs 38 having the same height as the front ribs 37 is formed inside the side plate 35.

The reason why the back column 10 is formed in a modified L shape is that the upright portion 22a of the rear link 22 is arranged in a space surrounded by the side plate 35 and the back plate 36. The standing portion 22 a of the rear link 22 is covered with an upper inside cover 39. For example, as shown in FIG. 9A, a bracket portion 40 for attaching the upper inside cover 39 is provided on the upper portion of the back plate 36 in the back column 10. An inward rear rib 41 extending vertically is formed on the back plate 36 of the back column 10.

As described above, the head column 27 tilts forward in conjunction with the rear tilt of the rear link 22, and the rotation absorbing device 29 is connected to the upper end of the standing portion 22 a in the rear link 22. Then, it may not fitted with a headrest device 6, in this case, for example, as shown in FIG. 11 (A), the upper end of the back posts 10 top cap 42 is attached. At the upper end plane of the back plate 36 in the back post 10, the locking portion 43 for attaching the top cap 42 is provided.

For example, as shown in FIG. 11, the side members 13a of the back frame 13 is overlapped from the left and right outside the back posts 10 of the swing frame 8. The side member 13a has a substantially trapezoidal cross-sectional shape in which the front-rear width gradually decreases toward the left and right outer sides, and both the front and rear surfaces are inclined backward so as to deviate toward the back toward the center of the backrest 5. .

The outer peripheral surface of each member constituting the back frame 13 is a flat surface. And as clearly shown as a representative of the side member 13a in FIG. 11, a groove 46 is formed on the outer side surface (the outer peripheral surface of the back frame 13) of each member so as to extend to the end edge of the support sheet 14. An edge member 47 fixed to the groove 46 is fitted in the groove 46. Incidentally, the edge member 47 are divided for each position of each member.

  Since the support sheet 14 is attached to the outer peripheral surface of the back frame 13, the entire area of the front surface of the backrest 5 is a seating surface, and thus a person with a large shoulder width is stably supported. Further, since the back frame 13 is hidden behind the support sheet 14 (visible through), it has an appearance as if the entire back and backrest 5 are composed of the support sheet 14, and therefore, a unique aesthetic is provided. It is evident.

  Since the support sheet 14 is attached to the outer peripheral surface of the back frame 13, the entire area of the front surface of the backrest 5 is a seating surface, and thus a person with a large shoulder width is stably supported. Further, since the back frame 13 is hidden behind the support sheet 14 (visible through), it has an appearance as if the entire back and backrest 5 are composed of the support sheet 14, and therefore, a unique aesthetic is provided. It is evident.

  For example, as shown in FIG. 10, a portion of the side member 13a that overlaps the back column 10 has a groove shape that opens inward, and a plurality of reinforcing ribs 48 are provided inside. This is for example to equalize the wall thickness as much as possible to prevent sink marks during molding.

As shown in FIG. 11, the back posts 10 is fastened to the back posts 10 in the screw 49 and the nut 50. Bis 49 is inserted from the inside to the side plate 35 of the back pillar 10, the nut 50 is non-rotatably held fitted into the nut hole 51 of forward opening formed in the side members 13a. Since the nut hole 51 is opened to the front, the nut hole 51 is hidden by the support sheet 14 and is hardly visible, and therefore there is no problem in aesthetics. The side member 13a is fixed to the back column 10 at two positions on the upper and lower sides. For example, FIG. 5 shows a screw insertion hole 52 of the side member 13a.

(4) Lumber Pad Next, the lumbar pad 15 will be described. The lumbar pad 15 is a resin product, and for example, as shown in FIG. 7, the lumbar pad 15 is bent vertically and vertically so as to protrude forward in a side view and a plan view. For this reason, the support sheet 14 is smoothly supported without stress concentration on a specific part. Then, the left and right outer end portions of the lumbar pad 15, the receiving portion 54 of the circle grooved fitted from the front to the upright portion 22a of the rear link 22 is protruded backward.

As shown in FIG. 8 (B), a chevron-shaped stopper projection 55 is formed on the inner bottom surface of the receiving portion 54, while a recessed portion 56 into which the stopper projection fits is formed on the standing portion 22 a of the rear link 22 in multiple stages. Is formed. The lumbar pad 15 is pressed against the upright portion 22a of the rear link 22 by the tension of the support sheet 14, and therefore , even if the recess 56 is very shallow , the lumbar pad 15 is held so as not to be displaced downward.

Further, on the back surface of the lumbar pad 15, as an example of the operation unit, a lateral operation piece 57 that can be picked by a person with a finger is integrally formed. Therefore, the user of the chair can adjust the height position of the lumbar support 14 according to his / her preference, physique and the like (the operation piece 57 can be operated behind while sitting). As shown in FIGS. 7 and 8, an inward restricting claw 58 is formed at the lower end and the rear end of one plate constituting the receiving portion 54, while the standing piece 22 a in the rear link 22 has The notch part 59 in which the restricting claw 58 can move up and down is formed.

By restricting the vertical movement range of the restricting claw 58 by the notch 59, the vertical movement stroke of the lumbar pad 15 is restricted and the lumbar pad 15 is held so as not to drop. Therefore, the regulation claws 58 and notch 59, performs the function of the fall prevention means and the stroke limiting means lumbar pad 15. A spacer 60 that stably holds the receiving portion 63 when the lumbar pad 15 is retracted is disposed on the inner surface of the upper inside cover 39.

Now, as best shown in FIG. 11, Oite viewed from the front, the lumbar pad 15 is disposed so as to overlap the back posts 10 and partially, thus, lumbar pad 15, the left and right ends of the backrest 5 It is arranged close by. Therefore , the lumbar pad 15 does not stand out greatly and is excellent in aesthetics. In particular, in the back view of the chair, the lumbar pad 15 is not conspicuous and the support sheet 14 is emphasized, so that it has a simple appearance. In addition, since the front surface of the back frame 13 is inclined so as to be shifted backward as it goes to the left and right inward, the support sheet is allowed to extend backward and deform due to leaning on a person, and to the support sheet 14 The burden is also reduced.

Further, the lumbar pad 15 is curved in a side view and a plan view (particularly the curvature in the side view is important), and the lumbar pad 15 is long in the vertical direction and has a large front area. Since the strong force does not concentrate on the narrow portion of the sheet 14, the support sheet 14 can ensure high durability. The lumbar pad 15 is vertically long the maximum width of elongated form vertically about 3-fold, whereas the outer end face 15a is vertically close form in front view, the inner end face outward The shape is loosely bent on the ridges, and the odor is also rounded when viewed from the front.

With such a shape, an appropriate support function is exhibited following the shape of the support sheet 14. In other words, the support sheet 14, although larger the degree of curvature in a plan view as it goes under the action of the rear link 22 of the back frame 13, a rounded also in a front view in the lumbar pad 15 as in the embodiment In this case, the support sheet 14 is easily bent downward so that the support sheet 14 is fitted to the three-dimensional bending shape of the support sheet 14.

(5). Second Embodiment FIG. 12 shows a second embodiment. This embodiment is basically Ri same der the first embodiment, the difference from the first embodiment, first, the point that the lower member 13c of the back frame 13 is in a member separate from the side member 13a Can be mentioned. In this embodiment, the lumbar pad 15 is formed in a plate shape, and a long flexible sheet 62 is arranged between the lumbar pad 15 and a support sheet (not shown). The flexible sheet 62 is fixed to the side member 13 a with screws or the like, but may be moved up and down together with the lumbar pad 15.

(6). Others present invention can be in addition to various concrete than the above embodiment. For example, the application target is not necessarily limited to a rotating chair, and can be applied to a fixed chair such as a theater chair or a bench . Without even mentioned daringly Ete, lumbar pad 15 is because it is not necessary to retract during locking, thus, it is also possible, such as attached vertically movably lumbar pad to the side members of the back frame. For example , the lumbar pad may be formed in a block shape so that a person can touch it.

DESCRIPTION OF SYMBOLS 1 Leg apparatus 3 Base 4 Seat 5 Backrest 8 Swing frame 10 Back column of rocking frame 13 Back frame 13a Side member of back frame 14 Support sheet 14a Lumber support part 15 Lumber pad 54 Receiving part 57 Operation as an example of operation part Fragment

Claims (2)

The front surfaces of the left and right lumbar pads are in a form that curves forwardly in both a side view and a plan view,
A chair with a backrest according to claim 1. The left and right lumbar pads are vertically long,
A chair with a backrest according to claim 1 or 2.

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