JP2925859B2 - Backrest device in chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a backrest device for an office chair or the like.

[0002]

2. Description of the Related Art In office chairs and the like, generally, one backrest is configured to be tilted backward against a spring.
I am trying to take a comfortable posture with my body leaning backwards,
When a person sitting on a chair tilts his / her upper body backward from an upright posture or a slightly slouched posture, the person's waist tends to move slightly forward.

[0003] For this reason, if the backrest is merely configured to be able to tilt backward, when a person leans on the backrest, a gap is created between the lower part of the backrest and the waist. The reaction force due to leaning on the backrest acts only on the back, and there is a disadvantage that the sitting comfort in the backward tilted state is insufficient. As a means for overcoming this drawback, Japanese Utility Model Publication No. Sho 63
Japanese Patent Application Publication No. -10765 discloses that a backrest is formed to be freely bendable in a side view, and that a bent portion of the backrest projects forward when a person leans on an upper portion of the backrest. Are described.

[0004]

However, in this prior art, since only the bent portion of the backrest is in a forwardly convex state when viewed from the side, the bent portion of the backrest excessively presses the waist of the person, and compresses the waist. However, there is a problem that the improvement in sitting comfort is insufficient. Further, each time the backrest is bent, a tensile force is generated in the cushion body and the topsheet of the backrest along the surface direction of the backrest, so that there is a problem that the durability of the backrest is low.

An object of the present invention is to provide a backrest device that solves this problem.

[0006]

SUMMARY OF THE INVENTION To achieve this object the present invention, a backrest which is upright on the rear of the seat body is supported by the seat receiving member, and the upper portion back body you support back of a person, human lumbar and the lower part the backrest body you supported separately formed, the upper backrest member, only mounted on the seat body or seat receiving body so as to be freely rear tilt against the elastic, and, upper and lower Height
Hold the leaning body on both sides with the upper back not tilting backwards.
While the front of the user is set to be substantially continuous
On the seat or seat receiver, upwards behind the seat
Move the slide member with extended support in the front-back direction
Mount freely and non-swingably.
The lower backrest is a space below the lower backrest.
In addition, an interlocking member that moves the slide member forward in conjunction with the backward tilt of the upper backrest body is installed.
It was to kick configuration.

[0007]

Operation and effect of the present invention In this configuration, a seated person
If you are not leaning on your back,
The front of the back body and the lower back body are continuous in approximately the same plane
, So a person almost uprighted his upper body as if he were working
In the non-locking state, the entire back of the person
Can be supported by For this reason, in the non-locking state
The upper body is supported in a stable state. On the other hand, when a person sitting on a chair leans on the upper back, the person's waist tends to move forward compared to when the upper body is upright. The lower backrest body moves forward with the slide body , that is, the lower backrest body moves in accordance with the forward movement of the waist, so that substantially the entire lower backrest body can be kept in close contact with the waist, so that compression on the waist can be performed. The waist can be supported by the lower backrest body without giving a feeling.

Thus, according to the present invention, the non-locking state
Without compromising the stable support of the upper body of the person at
Non-locking without leaning on the back, as the entire back can support the upper body of the person without leaning on the waist when leaning on the back
Comfort in both the state and lean on the locking state Ru can be over the counter. Further, the upper backrest body and the lower backrest body are completely separated, and the cushion body provided on the upper backrest body and the lower backrest body when the upper backrest body tilts back and forth or the lower backrest body moves back and forth. since the tensile force of the surface direction and the topsheet is never acts, Ru can durability of the backrest is also remarkably improved. Further, as in claim 2,
When the moving member is composed of a leaf spring, the structure can be extremely simplified.
There is an advantage that can be.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. Illustrated in Figures 1-5 is a first real施例, reference numeral 1 in these figures, shows the chair with a seat body 2 and the backrest 3. The seat 2 of the chair 1 is fixed to a seat receiving member 5 having an upward opening fixed to the upper end of a leg 4, and a U-shaped cross-section substrate 6 is fixed to the lower surface of the seat 2. doing.

[0010] The backrest 3 includes an upper portion backrest body 3a you support back M1 of human M sitting on the chair 1, into the lower part the backrest body 3b you support lumbar M2 of a person sitting on the chair 1 separation The lower part of the upper backrest 3a is hollowed out in a substantially U-shape when viewed from the front, and the lower backrest 3b is disposed inside the hollow part 7. Therefore, the lower backrest
There is no lower part of the upper backrest 3a below the body 3b.
It is open as a space. Also, from FIG. 1 and FIG.
As can be easily understood, the upper and lower backrest members 3a, 3b
The front surface is substantially flush.

At the left and right ends of the upper backrest body 3a,
A substantially L-shaped tilting rod 8 is fixed to the side view, and a middle part of the horizontal part of the two tilting rods 8 is pivotally connected to left and right side plates 5 a, 5 a of the seat receiving body 5 via a support shaft 9. Is wearing
You. Further, a portion of the both tilting rods 8, 8 near the leading end of the horizontal portion is formed in an obliquely downward inclined shape, and the left and right tilting rods 8,
The gas spring 11 is mounted between the shaft 10 mounted on the front end of the shaft 8 and the lower surface of the front part of the seat 2 . Accordingly
Te, tilting rear upper backrest member 3a against the elasticity of the gas spring 11.

A guide groove 1 extending horizontally is formed on the inner surface of the rear portion of the left and right side plates 5a, 5a of the seat receiving member 5.
Was opposed to 2,12 formed so as to extend, these right and left guide grooves 12, 12 of the slide member 13 is slidably mounted back and forth, a plate-shaped support part 1 which is erected from the slide member 13 4, the lower backrest body 3b is fixed .
Further, the left and right side plates 5a in the receiving seat member 5, a pin 15 which is mounted between the front and rear intermediate portion of 5a, the slide member 13
A leaf spring 16 as an example of an interlocking member is disposed between the supporting portion 14 and the front and back surfaces of the leaf spring 16 in the vertical direction, and one end 16 a of the leaf spring 16 is wound around the pin 15. On the other hand, the other end 16b of the leaf spring 16 is twisted so that the front and back surfaces thereof become vertical, and the other end 16b is inserted into a slit 17 formed in the support portion 14 , and Stop plate 1 inserted into hole 16c formed in end 16b
By screwing the support portion 1 4 8a with screws 18c, it is immovably fixed to the other end 16b of the leaf spring 16 to the support portion 1 4.

Further, a pressing pin 19 is mounted between the horizontal portions of the left and right tilting rods 8, 8 with respect to the upper backrest 3a so as to contact the upper surface of the leaf spring 16 in the middle of the front and rear directions. A cushion body 20 is provided on the upper surface of the seat body 2 and the front surfaces of the upper backrest body 3a and the backrest 3b , respectively.
Is stretched out.

In the above configuration , FIG. 2 shows a solid line.
Thus, the person M sitting in the chair 1 leans forward or straightens his upper body.
In the upright position, the upper body of the person M has upper and lower backrests 3a,
Widely supported throughout 3b. On the other hand, when the person M leans on the upper backrest body 3a, the upper body of the person M changes from a state shown by a solid line to a state shown by a dashed line in FIG.
In general, the waist M2 of the person M tends to move forward with the change of the posture of the upper body. When the upper backrest body 3a leans backward due to the leaning of the person M, the leaf spring 16 is pressed downward by the pressing pins 19 mounted between the left and right tilting rods 8, 8 of the upper backrest body 3a. Is bent downward and convex, and the slide member 13 moves forward, so that the lower backrest body 3a does not change its posture and the waist M2 of the person M.
And the lower backrest body 3b supports the waist M2 of the person M substantially entirely.

Therefore, when the person M leans his upper body backward, the back M1 of the person M is supported by the upper backrest 3a, and the waist M2 of the person M is supported by the entire lower backrest 3b. That is, since the upper body of the person M can be supported by the wide area of the backrest 3, a comfortable sitting comfort can be obtained without giving a feeling of oppression to the waist M2, and the lower backrest body 3b has the lower backrest body 3b. Of the shirt worn by the person M can be prevented from moving upward. Person M leaning on backrest 3
When the body is raised from the state, the upper backrest 3a
Return to the upright state with the ring 11, and the lower backrest body 3b
The spring 16 returns to its original position by the elastic restoring force.

FIGS. 6 to 8 show the upper backrest body 3.
As interlocking member of a and a lower backrest body 3b is a second real施例using wire. In an embodiment of this, the upper backrest member 3a and a lower backrest body 3b each formed in a front view a rectangle, the upper backrest member 3a, to project upward the pair of left and right pipe-shaped support from the rear of the seat body 2 A torsion coil spring 23 is rotatably connected to the upper end of the rod 21 by a horizontal pin 22 at a portion of the pin 22 that enters the inside of the upper backrest 3a. The upper backrest body 3a is configured to be capable of rearward tilting against the elasticity of the torsion coil spring 23 by being engaged with the rear plate 3a in contact with the rear plate 3a .

Further, as in the first real施例, the support to the slide member 13 mounted freely back and forth sliding in the seat receiving member 5
1 4 erected, lower back body 3b on the support portion 1 4
Is fixed . The left and right side plates 5 of the seat receiver 5
a rotary shaft 24 is mounted between a and 5a, and an outer peripheral surface of a first pulley 25 fixed to a substantially right and left intermediate portion of the rotary shaft 24 and a slide member 13 are connected by a first wire 26; Further, the second pulleys 2 fixed to both ends of the rotating shaft 24, respectively.
7, one end of a second wire 28 inserted into the inside of the support rod 21 is engaged, and the other end of the second wire 28 is
It is engaged with the outer peripheral surface of a third pulley 29 fixed to the pivot pin 22 with respect to the upper backrest body 3a .

The slide member 13 is urged by a spring means (not shown) to return to the rear position. In the second embodiment, the person M is placed on the upper back 3a.
When leaning, the slide member 13 is pulled forward through the second and first wires 28 and 26, whereby the lower backrest body 3b moves forward, and the waist M2 of the person M as in the first embodiment. The lower backrest body 3b moves forward following the movement of the lower backrest body 3b, and the waist M2 of M in a state where the upper body is tilted backward is supported by the entire lower backrest body 3b.

The support portion 14 is formed by a leaf spring,
As indicated by the dashed line 14 'in FIG. 8, the slide member 13
The support portion 14 may be configured to be slightly deformed in the front-rear direction. In both of the above embodiments, the person M is not leaning on the backrest 3 and the front surface of the upper backrest body 3a and the front surface of the lower backrest body 3b are substantially flush with each other. In a state in which M is not leaning on the backrest 3, the front surface of the lower back body 3b is formed so as to be located behind the front surface of the upper back body 3a, and only when the person M tilts the upper body backward, The lower backrest body 3b may support the waist M2 of the person M.

[0020] As the interlocking member in the present invention, the leaf spring and limited regardless the wire as described above, it is needless to say that links, etc. can be employed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a chair according to a first embodiment.

FIG. 2 is a side view showing an operation.

FIG. 3 is a perspective view schematically showing an interlocking mechanism.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a perspective view showing a second embodiment.

7 (A) is a sectional view taken along the line VII-VII in FIG. 6, and FIG. 7 (B) is (A)
FIG.

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a sectional view taken along line IX-IX of FIG.

[Explanation of symbols]

Reference Signs List 1 chair 2 seat body 3 backrest 3a upper backrest body 3b lower backrest body 5 seat receiver 8 tilting rod 12 guide groove 13 slide member 14 support portion 16 leaf spring 19 pressing pin

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 2-76931 (JP, U) JP-A 57-50251 (JP, U) JP 2-1075 (JP, Y2) (58) Field (Int.Cl. ⁶ , DB name) A47C 7/44-7/46

Claims (2)

(57) [Claims] The method according to claim 1 Suppositories received back erected behind the support the seat body at body, and the upper portion back body you support back of a person,
Human lumbar and the lower part the backrest body you supported separately formed, the upper backrest member, only mounted on the seat body or seat receiving body so as to be freely rear tilt against the elastic, and, upper and lower
With the backrest in a state where the upper backrest does not tilt backward
Set one so that the front surfaces of both are continuous in substantially the same plane.
On the seat or the seat receiver, upwards behind the seat
Move the slide member with extended support in the front-back direction
Mount freely and non-swingably.
The lower backrest is a space below the lower backrest.
A backrest device for a chair, wherein the backrest device is provided in an open state, and further provided with an interlocking member for moving a slide member forward in conjunction with the backward tilting of the upper backrest body. (2) Place the upper backrest on the seat
While attached to the tilting rod that is mounted to be tiltable,
The member is made of a band-shaped leaf spring, and one end of the leaf spring is seated.
And the other end to the slide member.
The tilt between the one end and both ends of the leaf spring
As a structure in which the middle part is pushed downward by the tilting rod
2. The chair according to claim 1, wherein
Backrest device.