JP4456265B2 - Lumber support device in chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lumbar support device that is provided on a backrest of a chair and supports a waist of a seated person.
[0002]
[Prior art]
Some chair backs are provided with a lumbar support that can comfortably support the lumbar part of the occupant so as to relieve fatigue when sitting for a long time.
This lumbar support is normally provided between the back plate and the cushion body covering the surface so that the vertical position can be adjusted, and thus is not exposed to the outside.
[0003]
Therefore, the color of the conventional lumbar support is determined without harmonizing with the color of the back plate. For example, when molding with synthetic resin, the color of the least expensive black or the material itself is often used.
[0004]
[Problems to be solved by the invention]
Some backboards of a chair are provided with a number of lightening holes in order to provide air permeability and flexibility to improve the feel during backrest.
[0005]
If a lumbar support such as black, which is different from the color of the back plate as described above, is provided on the backrest having such a hollow hole, this is conspicuously exposed through the numerous hollow holes, and the appearance of the chair as a whole The appearance of is impaired.
[0006]
In addition, since the conventional lumbar support is also non-translucent, the light that has passed through the lightening hole does not hit the back cushion body, and if the lumbar support is used for a long time at a fixed position, the back cushion body The hue becomes darker due to fading in other parts.
[0007]
In this case, when the position of the lumbar support is shifted up and down, it is revealed that the shade of the cushion body is shaded through the lightening hole, and the appearance is deteriorated.
[0008]
The present invention has been made in view of the above problems, and by reducing the presence of the lumbar support and making it less conspicuous, the appearance of the chair is improved and the shade of the cushion body is prevented from being shaded. In addition, an object of the present invention is to provide a lumbar support device for a chair that improves operability when adjusting the vertical position of the lumbar support, and improves flexibility of the back plate.
[0009]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) A transparent lumbar support with translucency is mounted between the front of the back plate with a large number of holes in the backrest and a cushion covering the front so that the vertical position can be adjusted. To do.
[0010]
(2) In the above item (1), slits facing in the vertical direction are formed in the left and right side portions of the back plate, so that the inner back receiving portions of both slits have flexibility in the front-rear direction.
[0011]
(3) In the above item (2), a horizontal slit connected to the left and right slits is also formed in the middle part of the back plate, and the opposing ends of the upper and lower back support parts facing each other with the horizontal slit interposed therebetween. The proper places are connected by flexible pieces.
[0012]
(4) In any one of the above items (1) to (3), the left and right side portions of the lumbar support are engaged with the left and right side portions of the back support portion so as to be vertically movable in the left and right slit portions.
[0013]
(5) In the above item (4), the lumbar support can be locked and held at any position by elastically engaging the left and right sides of the lumbar support and the left and right sides of the back support. A suitable engaging means is provided.
[0014]
(6) In the above item (5), the engaging means includes a plurality of corrugated locking grooves provided in the vertical direction and an elastic engagement piece that can selectively engage with the locking grooves. Shall.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a chair to which the present invention is applied, and FIG. 2 is a rear view of the chair, and a caster is attached to the tip of a support leg (1) consisting of five radially extending from the center. (2) is provided, and a support base (4) is fixed to an upper end portion of a pedestal (3) erected at the center of the support leg (1).
[0016]
The support base (4) has an L-shape in a side view and extends rearward and upward, and a lower front end of a pair of left and right dorsal fins (6) supporting the back plate (5) has a shaft (7 ), And the back plate (5) and the dorsal fin (6) are tilted at a desired angle backward from the standing position shown in FIG. 1 by a reclining mechanism (not shown) provided in the support base (4). It can be done.
[0017]
Above the support base (4), the seat (8) moves rearward and downward through the seat support (9) in conjunction with the back tilt of the back plate (5) and the back saddle (6). It is supported by.
On both sides of the seat receiver (9), armrests (10) are provided via supports (9a) extending in the left-right direction.
[0018]
As shown in the front view of FIG. 3, the back plate (5) is integrally formed of a synthetic resin in a substantially rectangular shape, and slits (11) and (11) facing upward and downward are formed on both sides thereof. Thus, the outer side is a high-rigidity side frame (12), and the inner side of the slit (11) is a flexible, low-rigidity backrest (13).
[0019]
The thickness of the back support portion (13) in the front-rear direction is smaller than that of the side frame portion (12), thereby making the back support portion (13) flexible.
[0020]
Near the back of the back support (13), a horizontal slit (14) is formed that faces in the left-right direction and both ends are continuous with the center of the left and right slits (11). The opposing end edges of the upper and lower back support portions (13) sandwiching the slit (14) are connected by a forward-facing U-shaped flexible piece (15) formed integrally with the upper and lower ends.
[0021]
The back receiving portion (13) can be largely bent when the back is stood by the action of the left and right slits (11), the horizontal slit (14), and the flexible piece (15).
[0022]
The back support portion (13) is provided with a number of horizontally-extended hexagonal hollow holes (16), and the whole is made into a mesh shape, thereby further improving air permeability and flexibility.
[0023]
The lower half of the back of both sides of the back plate (5) is screwed to the front of the left and right dorsal fins (6).
[0024]
(17) is a cushion body that covers the entire front surface of the back plate (5), and a winding portion (17a) for winding the upper end of the back plate (5) rearward is formed at the upper end thereof. The winding portion (17a) is fastened to the plurality of engagement holes (18) drilled in the upper end portion of the back plate (5) so as to be detachable.
[0025]
As shown in FIG. 3, guide ridges (19) and (19) for holding a lumbar support (20), which will be described later, adjustable in the vertical position, are provided on the left and right sides of the front surface of the intermediate portion of the back support (13) The left and right slits (11) protrude in the up-down direction substantially parallel to the lower ends of the slits (11).
[0026]
A plurality of corrugated locking grooves (19a) are formed in the vertical direction on the inner surfaces of the both guide protrusions (19) facing each other.
[0027]
As shown in FIGS. 4 to 8, the lumbar support (20) includes a horizontally long main body (21) having a substantially semi-cylindrical shape and a pair of suspension arms (22) extending upward from the upper surfaces of both left and right ends. (22) and a support portion (23) connected to the upper ends of both suspension arms (22), which are made of translucent transparent synthetic resin material such as styrene resin, methacrylic resin, AS or ABS. It is integrally formed of a colorless, transparent and relatively hard synthetic resin such as resin or polycarbonate.
[0028]
The main body (21) is curved so that the outer peripheral surface faces frontward and the central portion gently bulges rearward.
[0029]
A corrugated flexible part (22a) is formed in the middle part of the suspension arm (22), and the suspension arm (22) can be bent back and forth around the flexible part (22a).
[0030]
As shown in FIGS. 4 and 6 in an enlarged manner, both support portions (23) protrude rearward into a U-shaped holding piece (24) facing inward in plan view and a vertical piece (24a) on the rear side. A pair of upper and lower grip pieces (25) and (25) provided, and extends slightly rearward at the inner end of the vertical piece (24b) on the front side of the holding piece (24), A pair of upper and lower elastic engagement pieces (26a) and (26b) are formed integrally, with their opposite end portions bent slightly inward and the inner side surfaces thereof being curved in an arc shape.
[0031]
On the inner opening edge of each holding piece (24), vertically extending ridges (27) and (27) are formed facing each other, and the spacing between the opposed surfaces of both ridges (27) is The thickness of the back support (13) is equal to or slightly smaller than the plate thickness.
[0032]
The distance between the front and rear vertical pieces (24a) and (24b) in the holding piece (24) is such that it can be inserted into the back support (13) with a margin (see FIG. 4).
[0033]
To attach the lumbar support (20) having such a structure to the back support (13), as shown in FIGS. 3 and 4, the cushion (17) is removed and the back support (13) is removed. From the front side, the holding pieces (24) in the left and right support portions (23) are positioned in the space portion (S) where the left and right slits (11) and the horizontal slit (14) are continuous, and the front and rear vertical pieces ( 24a) and (24b) are inserted from above so that both sides of the lower half back support (13) are held from the outside.
[0034]
At this time, if the dimension between the protrusions (27) formed at the opening end of the holding piece (24) is set slightly smaller than the plate thickness of the back receiving part (13), the holding piece (24) By elastically deforming in the expanding direction, the front and back surfaces of the back support portion (13) can be held without being affected by the elastic force.
[0035]
After inserting both holding pieces (24) up to the upper end of the guide ridge (19) formed on the front of both sides of the back support (13), the upper and lower elastic engagement pieces (26a) (26b) guide Push it down until it rides on the ridge (19). Then, in a state where the elastic engagement pieces (26a) and (26b) are elastically deformed forward, any one of the corrugated locking grooves (19a) on the inner surface of the guide protrusion (19) is elastically engaged.
[0036]
Thus, the lumbar support (20) is prevented from moving loosely in the vertical direction, and the vertical position can be adjusted stepwise by the number of the locking grooves (19a). At this time, since the flexible arm (22a) is formed on the suspension arm (22), the suspension arm (22) can be moved up and down without any trouble even if the lower portion of the back support (13) is curved forward.
[0037]
In order to adjust the vertical position, it is only necessary to pinch and move the grip pieces (25) at the rear of the support portions (23) from the rear of the back plate (5).
[0038]
As described above, since the lumbar support (20) of the above embodiment is formed entirely of a light-transmitting colorless and transparent synthetic resin material, its presence is thin and the back plate (5) is thinned. Even if it is visible through the hole (16), it does not stand out.
[0039]
In addition, since the light that has passed through the lightening hole (16) passes through the lumbar support (20) and hits the back surface of the cushion body (17), even if the lumbar support (20) is used at a fixed position for a long time, The shade between the back side cushion body (17) and the other parts does not cause shade. Therefore, when the lumbar support (20) is moved up and down, the shading is not exposed to the lightening hole (16), and the appearance is not impaired.
[0040]
【The invention's effect】
According to the first aspect of the present invention, since the presence of the lumbar support becomes thin, the presence or absence of the lumbar support is clearly recognized through the lightening hole (16) regardless of the color of the back plate and the cushion body. It will not be done and the appearance will improve.
[0041]
In addition, even if the lumbar support is used at a fixed position for a long period of time, there is no color shade between the back cushion body and other parts, and this is exposed from the lightening holes and the appearance is impaired. There is nothing.
[0042]
According to the second aspect of the present invention, since the back support portion is appropriately bent so as to bend backward when the backrest is seated, the sitting comfort is good and the feeling of fatigue is alleviated.
[0043]
According to the third aspect of the present invention, since the bending allowance of the back support portion is large, the sitting comfort and the feeling of fatigue are further improved.
[0044]
According to the fourth aspect of the present invention, since the engaging portion between the lumbar support and the back plate is concealed by the cushion body, the appearance is improved.
[0045]
According to the fifth aspect of the present invention, the vertical position of the lumbar support can be easily adjusted according to the seated height of the seated person.
[0046]
According to the sixth aspect of the present invention, the vertical position of the lumbar support can be adjusted smoothly step by step and with a sense of moderation.
[Brief description of the drawings]
FIG. 1 is a side view of a chair to which the present invention is applied.
FIG. 2 is also a rear view.
FIG. 3 is a front view of the back plate with the lumbar support attached thereto.
4 is an enlarged cross-sectional plan view taken along the line IV-IV in FIG. 3;
FIG. 5 is a perspective view of the lumbar support of the present invention as seen from the back.
FIG. 6 is an enlarged perspective view of a support portion in the same manner.
FIG. 7 is a front view of the same.
FIG. 8 is also a plan view.
[Explanation of symbols]
(1) Support legs
(2) Casters
(3) pedestal
(4) Support base
(5) Backboard
(6) Backpack
(7) Axis
(8) Seat
(9) Seat receiver
(9a) Support
(10) Armrest
(11) Slit
(12) Side frame
(13) Back support
(14) Slit
(15) Flexible piece
(16) Meat hole
(17) Cushion body
(17a) Entrainment part
(18) Engagement hole
(19) Guide ridge
(19a) Locking groove
(20) Lumber support
(21) Body
(22) Suspended arm
(22a) Flexible part
(23) Support part
(24) Holding piece
(24a) (24b) Vertical piece
(25) Grip piece
(26a) (26b) Elastic engagement piece
(27) Projections
(S) Space

Claims (6)

A transparent lumbar support with translucency is mounted between the front surface of the back plate in which a number of lightening holes in the backrest are perforated and the cushion covering the front surface so that the vertical position can be adjusted. A lumbar support device for a chair as a feature. The lumbar support device for a chair according to claim 1, wherein slits directed in the vertical direction are formed in both left and right side portions of the back plate so that the inner back receiving portion of both slits has flexibility in the front-rear direction. A horizontal slit connected to the left and right slits is also formed in the middle part of the back plate, and appropriate positions between opposite ends of the upper and lower back receiving parts facing each other across the horizontal slit are connected by a flexible piece. The lumbar support device for a chair according to Item 2. The lumbar support device for a chair according to any one of claims 1 to 3, wherein left and right side portions of the lumbar support are engaged with left and right side portions of a back support portion so as to be vertically movable in left and right slit portions. 5. An engagement means capable of locking and holding the lumbar support at an arbitrary position by elastically engaging the left and right side portions of the lumbar support and the left and right side portions of the back support portion. Lumber support device in the described chair. The chair according to claim 5, wherein the engaging means includes a plurality of corrugated locking grooves provided in the vertical direction and an elastic engagement piece selectively engageable with the locking grooves. Lumber support device.

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