JP4546991B2 - Chair - Google Patents

Description

  The present invention relates to a chair that is suitable for operating OA equipment such as a personal computer and that can ensure a stable posture during reclining.

  A chair equipped with a mechanism that tilts the seat and backrest plate to support the body appropriately in response to changes in various postures and work postures in desk work performed using OA equipment such as personal computers. Is known.

In such a chair, when the backrest part is inclined backward, the upper part of the backrest is always kept at the same angle as the rearward inclination angle (for example, see Patent Document 1), or the reclining angle of the backrest part Regardless of this, there is a built-in parallel link mechanism in which the upper part of the backrest is always tilted forward at the same angle.
International Publication No. WO96 / 25072 Pamphlet

  However, among the above-described conventional chairs, the former has a drawback that when the backrest portion is tilted backward, the position of the head of the seated person greatly moves backward, and the display of the personal computer becomes difficult to see. That is, when the seated person is leaning against the backrest, the direction of the line of sight is directed upward from the horizontal, and the angle of viewing the monitor screen on the desk is generally 5 ° from the horizontal. If you try to take a posture that looks -10 ° downward with a conventional chair, you have to turn your head forward and downward, causing stiff shoulders and neck fatigue.

  Also, if you forcibly turn your head forward and downward, the shape of the backrest and the curve of the back do not match, and there will be a part where the body floats from the backrest, so the posture becomes unstable, As a result, it becomes impossible to adopt a stable backward tilted posture, which causes fatigue.

  Among the conventional chairs mentioned above, the latter always keeps the upper part of the backrest at the same inclination angle regardless of the reclining angle of the backrest. I feel it.

The present invention has been made in view of the above-described problems of the prior art, and a chair that can always hold an appropriate posture when working in various postures. The purpose is to provide.
Another object of the present invention is to provide a chair that can take a relaxed posture while turning its line of sight toward the display when using an OA device such as a personal computer.

According to the present invention, the above problem is that the upper and lower portions of the backrest plate that can be elastically bent rearward at the upper and lower portions of the vertical saddle portion of the pair of left and right backrest frames standing from the rear portion of the seating portion. Are attached so that a space is formed between the intermediate portion of the backrest plate and the vertical saddle portion so that the intermediate portion of the backrest plate can be elastically bent backward, and the backrest plate is pressed backward. This is solved by the fact that the intermediate portion of the backrest plate is elastically bent backward.

  According to the present invention, the upper and lower portions of the backrest plate whose middle portion can be elastically bent backward are attached to the upper and lower portions of the vertical saddle portion of the pair of left and right backrest frames that stand up from the rear portion of the seating portion. When the seat is pushed backward, the middle part of the backrest plate is elastically bent backward, so that when the seated person takes a reclining posture, the middle part of the backrest plate protrudes backward. A relaxed posture in which the lower part of the lower back is tilted while looking at the monitor screen with the head raised when using OA equipment such as a personal computer. Can be easily taken.

  In addition, the angle of the dogleg-shaped bending to the back changes according to the degree of the backward leaning posture on which the seated person leans, so that a natural sitting comfort without a feeling of pressure is obtained, and the backrest plate is smooth with changes in posture Because it follows the back, it can fit on the curve of the back and realize a comfortable seat without any pressure.

  In addition, when the back is extended from the bent state, the backrest plate will naturally return from a bent shape to a flat state following the movement of the back, and is most useful for the seated person. You can easily take a relaxed posture and reduce fatigue when sitting on a chair for a long time.

  Next, an embodiment of a chair according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an exploded perspective view showing a structure of a backrest part which is a main part of the chair according to the first embodiment of the present invention. As shown in the figure, the back portion of the chair of this embodiment includes a back frame (10), a pair of left and right reinforcing members (12) and (12), a back plate (14), and a back cushion material (16 ) Etc.

  The back frame (10) is made of a pair of left and right pipe members, and the horizontal flange (10a), which is the lower end of the back frame, extends forward, and its tip is attached to a seat plate (not shown). It is possible to tilt backward with fulcrum as the fulcrum.

On the other hand, the vertical saddle portion (10b) is formed at two locations, upper and lower, and is bent in a rearward convex shape and a forward convex shape in a side view. That is, the upper part of the vertical hook part (10b) is formed with a bent-shaped bent portion that protrudes rearward in a side view and forms a receiving part, and below the vertical hook part (10b) in a side view. In FIG. 5, a convex-shaped bent portion is formed forward.
The upper and lower portions of the left and right vertical hooks (10b) and (10b) are connected by two parallel upper and lower horizontal hooks (18) and (18).

  Between the upper part and the lower part of the vertical collar part (10b) of the backrest frame (10), a pair of elastic reinforcement members (12), (12) of elastic bodies are attached to the left and right. Of these, the rear U-shaped bracket (20) is arranged on the upper part of the vertical hook part (10b) so that the angle can be changed and the vertical hook part (10b) is sandwiched from both sides. Thus, it is pivotally supported with an axis (20a) pointing in the left-right direction.

  At the front portion of the bracket (20), a guide pin (20b) having a flange portion at the front end is projected. The guide pin (20b) is fitted with a vertically extending guide hole (12a) drilled in the upper part of the reinforcing material (12), and the upper end of the reinforcing material (12) is vertically moved within a certain range. It is guided to slide freely.

  The reinforcing material (12) is made of an elastic material, such as a resin, and connects the upper and lower portions of the backrest frame (10) with a certain tension. Near the center of the reinforcing material (12) in the vertical direction, there is a rearward convex bent-shaped bent portion (12b) .When the backrest plate (14) is attached, both sides of the reinforcing material (12) will be bent later. The portions (14c) and (14c) are fitted to each other so that they can bend and bend at the same height as the backrest plate (14).

  The back plate (14) includes an upper shell (14a) and a lower shell (14b) with the bent portions (14c) and (14c) as boundaries, and the upper and lower shells (14a) and (14b) are bent in the front-rear direction. It is connected to bendable. The lower shell (14b) is attached to the lower surface of the reinforcing member (12) and the upper end of the upper shell (14a) is attached to the upper portion of the reinforcing member (12) by a set screw (22), respectively. Is interposed between the backrest plate (14) and the backrest frame (10).

  A vertically long slide hole (24) is formed at the upper end of both sides of the upper shell (14a), and this slide hole (24) is fitted to the above-described guide pin (20b) and guided so as to be movable up and down. Yes. As a result, the backrest plate (14) moves together in the vertical direction when the reinforcing member (12) moves up and down.

  As shown in FIGS. 1 and 2, the backrest plate (14) is generally the same as the curve of the back surface of the back cushion material (16), which will be described later, and an arcuate curved surface with a middle portion recessed backward in a side view. However, when a backward force is applied to the lower shell (14b), the upper shell (14a) has elasticity that tilts forward with respect to the bent portion (14c).

  A back cushion material (16) is attached to the surface of the backrest plate (14) by appropriate means to form the back portion of the chair.

  FIG. 2 is a side view showing the entire chair including the back of the chair of FIG. As shown in FIG. 2, the recumbent portion (10a) of the backrest frame (10) can be tilted to the support base (30) provided on the seat plate (28) of the chair via the mounting piece (26). It is attached. A seat cushion material (32) is attached to the seat plate (28).

  Next, the operation of the chair of this embodiment will be described.

  FIG. 3 shows a state in which the chair back is tilted backward. When the entire backrest is tilted backward, a force is applied to the lower shell (14b) of the backrest plate (14), and the lower shell (14a) tilts backward with the support base (30) as a fulcrum. As the lower shell (14b) moves rearward, the guide pin (20b) guides the guide hole (12a) shown in FIG. 1, and the reinforcing member (12) is slid downward, and further load is applied. Then, the guide pin (20b) comes into contact with the inner upper portion of the guide hole (12a), and the reinforcing member (12) is bent at the bent portion (12b).

  Then, as the backrest plate (14) bends the bent portion (12b) of the reinforcing member (12), the upper shell (14a) is opposed to the lower shell (14b) with the bent portion (14c) as a boundary. Tilt forward and push the upper part of the back cushion material (16) forward. That is, as shown in FIG. 4, when the seated person shifts from the normal upright posture to the posture shown in FIG. 5, the upper part of the back is pushed forward and supported by the back cushion material (16).

  At this time, the bent portion (14c) of the backrest plate (14) and the bent portion (12b) of the reinforcing member (12) are rearwardly convex bent portions that are receiving portions in the backrest frame (10). Therefore, the upper part of the backrest plate (14) can be elastically bent into a rearward convex shape without being obstructed by the backrest frame (10).

  According to the chair of the present embodiment, the angle at which the upper shell (14a) tilts forward changes according to the degree to which the seated person tilts backward, and the back cushion material ( The upper part of 16) is pushed forward to support the upper part of the seated person's back. Accordingly, for example, when using an OA device such as a personal computer, a relaxed posture in which the portion below the waist is tilted backward can be easily taken while raising the head in front and looking at the monitor screen.

  Further, in the chair of the present embodiment, as shown in FIG. 5, when the rear shell is tilted, the upper shell (14a) is tilted forward and supported so as to push the back of the seated person. The line of sight becomes almost horizontal. For this reason, it is possible to easily take an attitude of looking downward from 5 ° to 10 ° from the horizontal suitable for viewing the monitor screen.

  In addition, the angle at which the upper shell (14a) bends forward changes according to the degree of the leaning posture, so that a natural sitting comfort without a feeling of pressure is obtained, and the back cushion material (16) is smooth for posture changes. Because it follows, it fits the curve of the back and can realize a comfortable seat without feeling of pressure.

  That is, as shown in FIG. 6, when the back is extended from the bent state of FIG. 5, the upper shell (14a) smoothly tilts backward to follow the movement of the back. The most relaxed posture can be easily adopted for the seated person, and the fatigue when sitting on the chair for a long time is reduced.

  In addition, because the reinforcements (12) are provided on the left and right sides of the chair, the backrest plate (14) can follow the weight shift in the left-right direction, and flexibly respond to changes in posture during work. be able to. Furthermore, since the mechanism part is concentrated above the back part of the chair, it is possible to reduce the size and weight as compared with the conventional one, and to refine the design.

  In the present embodiment, the reinforcing material (12) is interposed between the backrest plate (14) and the backrest frame (10), but without the reinforcing material (12) interposed, the backrest plate ( The same function can be demonstrated by 14) alone.

  In this embodiment, both the reinforcing member (12) and the backrest plate (14) are slidably attached to the upper end of the backrest frame (10), but one of them may be slidably attached. Good.

  7 to 9 show a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected and shown to the member which is the same as that in the above-mentioned 1st Embodiment, or respond | corresponds.

  The back frame (10) of the second embodiment is made of a pair of left and right metal or hard synthetic resin saddles, and the lower horizontal part (10a) of the lower part extends forward, and its tip is a support base. It is attached to a so-called back seat synchro reclining mechanism attached to (30), and can be tilted backward about a fulcrum near the fulcrum (30).

  The pair of left and right upper gutters (10b) are formed by bending in the shape of a pair of arrows opposite to each other so that the upper part protrudes rearward and the lower part protrudes forward. .

An attachment portion (34) having a vertical slide groove (34a) is fixed to the front surface of the upper end portion of the vertical flange portion (10b) so as to protrude forward. The slide groove (34a) has an arc shape protruding forward, and the outside and at least the top thereof are open.
Further, a horizontal bearing (36) having an open top is fixed to the front surface of the lower bent portion of the vertical flange (10b) so as to protrude forward.

  The backrest plate (14) is, for example, a molded product of a hard synthetic resin material having elasticity, and includes an upper shell (14a) and a lower shell (14b), and the upper shell (14a) and the lower shell (14b) The boundary is set at the same level as the bent portion of the upper part that protrudes rearward from the above-mentioned vertical saddle portion (10b). This position hits the boundary between the seated person's thoracic vertebra and lumbar spine.

  The lower end portion of the upper shell (14a) and the upper end portion of the lower shell (14b) are formed in a corrugated shape in a side view, and a pair of left and right bent portions (14c) that can be elastically bent in the front-rear direction. It is connected.

  In this embodiment, the bent portion (14c) is shown as being integrally formed with the upper and lower shells (14a) and (14b). However, the bent portion (14c) may be separate from the upper and lower shells (14a) and (14b). Further, the bent portion (14c) is not limited to the two rows at the left and right ends, and a plurality of the bent portions (14c) can be provided.

  At the upper end of the upper shell (14a), a pair of left and right pivots facing inward, that is, a horizontal axis (38) is formed so as to protrude rearward from the side edge. The horizontal shaft (38) is fitted in the slide groove (34a) at the upper end of the above-described vertical flange (10b).

  An opening (40) is formed at a position corresponding to the horizontal bearing (36) of the above-described vertical flange (10b) at both side edges of the lower shell (14b), and the left and right directions are formed at the center thereof. The horizontal axis (40a) which faces is formed so as to straddle the opening (40) and to protrude forward.

  In assembly, the horizontal shaft (38) at the upper end of the upper shell (14a) is fitted from above into the slide groove (34a) at the upper end of the vertical flange (10b), and the horizontal bearing ( 36), the horizontal shaft (40a) of the lower shell (14b) is dropped from above to be elastically held.

  In this way, the back plate (14) is attached to the back frame (10), and then the back cushion material (16) is attached to the front and back surfaces of the back plate (14) by a predetermined means, and the back of the chair is attached. It is formed. 7 to 9, the illustration of the back cushion attached to the back side of the backrest plate (14) is omitted.

  Next, the effect | action of this embodiment is demonstrated with reference to FIG.8 and FIG.9.

  When the seated person is sitting in the upright position (Fig. 8), when the backrest is pushed backward with the back and the entire backrest is tilted back to the reclining position, the backrest is applied by the backward force acting on the backrest plate (14). The frame (10) tilts backward about the fulcrum near the fulcrum (30) (FIG. 9).

  Further, the backward pressing force by the seated person's back acts on the lower part of the upper shell (14a) and the upper part of the lower shell (14b), respectively, and as shown in FIG. 9, the bent part (14c) moves up and down. The lower shell (14b) is further tilted backward with respect to the backrest frame (10) and the upper shell is further bent. (14a) is tilted forward with respect to the back frame (10) and the lower shell (14b), but at an absolute level, with an angle smaller than the back tilt angle of the back frame (10) and the lower shell (14b), It is gently tilted backwards.

  At this time, the horizontal shaft (40a) supported by the horizontal bearing (36) is rotated integrally with the lower shell (14b) at that position, and the horizontal shaft (40a) provided at the upper end of the upper shell (14a). The shaft (38) descends along the slide groove (34a) by the amount that the backrest plate (14) is bent and contracted in a square shape.

  Other operations and effects are the same as those of the first embodiment.

FIG. 10 shows a third embodiment of the present invention.
In the present embodiment, the back plate (14) includes an upper shell (14a), a lower shell (14b), and one or more (two in this embodiment) intermediate shells (14d) therebetween. The horizontal shaft (38) provided on the upper part of the upper shell (14a) can be slid almost vertically in the slide groove (34a) of the mounting part (34) provided on the upper part of the backrest frame (10). The lower shell (14b) is attached to the horizontal bearing (36) provided at the lower part of the backrest frame (10) with the horizontal shaft (40a). It is attached so that it can be slightly tilted in the direction, and the U-shaped bend in the front view is bent between the upper shell (14a), the middle shell (14d) and the lower shell (14b) so that it can be elastically bent in the front-rear direction. They are connected to each other via the part (14c).

According to the third embodiment, at the time of reclining, since the entire backrest is bent in a substantially arc shape so as to fit the back of the seated person, there is an advantage that the seating feeling is good. Other configurations, operations, and effects are substantially the same as those of the first embodiment.
The backrest plate (14) should be bent in advance so that the middle portion is recessed backward as shown by the solid line in FIG. 10 even when the load on the back of the seated person is not applied. .

  According to the present invention, many other changes can be made in addition to the above. For example, an upper end of the upper shell (14a) is attached to the upper portion of the backrest frame (10) so as to be slightly tiltable in the front-rear direction, and a lower portion of the lower shell (14b) is attached to the lower portion of the backrest frame (10). It may be attached so that it can slide substantially vertically and can be tilted slightly in the front-rear direction.

It is a disassembled perspective view which shows the principal part of the chair of the 1st Embodiment of this invention. Similarly, it is a side view of a chair. Similarly, it is a side view of a chair showing a state where the backrest is tilted backward. Similarly, it is a side view which shows the use condition of a chair. Similarly, it is a side view which shows the use condition which made the backrest tilt backward. Similarly, it is a side view showing a use state in which the backrest is tilted backward and the back is extended. It is a disassembled perspective view of the 2nd Embodiment of this invention. Similarly, it is a side view in the upright sitting state of this embodiment. Similarly, it is a side view in a backward tilted position. It is a schematic explanatory drawing of the principal part of the 3rd Embodiment of this invention.

Explanation of symbols

(10) Back frame
(10a) Yokohama
(10b) Vertical saddle
(12) Reinforcing material
(12a) Guide hole
(12b) Bend
(14) Back plate
(14a) Upper shell
(14b) Lower shell
(14c) Bent part
(14d) Middle shell
(16) Back cushion material
(18) Horizontal fence
(20) Bracket
(20a) shaft
(20b) Guide pin
(22) Set screw
(24) Slide hole
(26) Mounting piece
(28) Seat plate
(30) Support base
(32) Seat cushion material
(34) Mounting part
(34a) Slide groove
(36) Horizontal bearing
(38) Horizontal axis
(40) Opening
(40a) Horizontal axis

Claims (1)

The top and bottom of the vertical rod portion of the left and right pair of the back frame to be raised from the rear of the seat, the upper and lower portions of the backrest plate a middle portion in the vertical direction is backwards elastically bending, the intermediate portion of said back plate The intermediate portion of the backrest plate is attached so that a space that can be elastically bent rearward is formed between the backrest plate and the vertical saddle portion, and when the backrest plate is pressed rearward, the backrest plate A chair characterized in that an intermediate portion is elastically bent backward.

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