JP7448354B2 - Chair - Google Patents

Description

TECHNICAL FIELD The present invention relates to a chair that can adjust the front and rear positions of the seat.

BACKGROUND OF THE INVENTION In chairs such as office rotary chairs, the front and back positions of the seats are adjustable to accommodate the user's physique and preferences. In this case, for example, in Patent Document 1, the seat support is supported by a base provided at the upper end of the leg support, the seat is attached to the seat support so as to be slidable back and forth, and a support is provided on one side of the seat for adjusting the front and back position. A lever is attached.

Japanese Patent Application Publication No. 2012-254309

Now, in Patent Document 1, the seat support protrudes below the seat plate. However, if the seat support protrudes below the seat, for example, the seat support will be easily seen by a person sitting on another chair, which may impair the aesthetic appearance.

To explain further, a seat generally has a structure in which a cushion body is stretched over the seat plate, and the cushion body is covered with a skin material such as cloth from above, and the skin material is rolled downward and covers the seat board. The underside is often covered with a skin material, but if the seat support protrudes below the seat, the contrast between the color of the skin material and the seat support will make the seat stand out, giving the viewer a sense of design. There was a risk that it would make people feel uncomfortable.

The present invention aims to improve this current situation.

The present invention, as claimed in claim 1,
"Equipped with a seat support shell body supported by a base provided at the upper end of the leg support, and a seat attached to the seat support shell body so as to be movable back and forth,
The seat includes a seat plate, a cushion body disposed on the upper surface of the seat plate, and a skin material covering the cushion body from above.
In the basic configuration,
"A recess that is recessed upward so that the seat support shell body can fit into the lower surface of the seat is formed to be longer than the longitudinal length of the seat support shell body so as to allow fore and aft movement of the seat,"
Furthermore, the skin material is rolled up below the seat plate and reaches into the recess .
It retains that characteristic.

The present invention can be developed in various ways, and as an example, in claim 2,
"An operating lever for adjusting the front and back position of the seat is arranged on one or both of the left and right sides of the seat plate in a state exposed from the skin material."
The structure is as follows.

Furthermore, in claim 3, in claim 2 ,
"A relief part for exposing the operating lever is formed in the skin material, and a peripheral edge of the relief part is covered with a cover having a hole for exposing the operating lever."
The structure is as follows.

In the present invention, since the seat support shell body is inserted from below into the downward opening recess formed in the seat plate, the seat support shell body does not come into view even if a person sitting on another chair sees it. . Therefore, although the seat can be adjusted in the front and rear positions, the design of the seat can be streamlined and the aesthetics can be improved.

Furthermore, in the present invention, since the skin material is rolled up to the recess of the downward opening of the seat plate, it is possible to achieve a clean appearance as if the seat part was composed only of the cushion body. This makes it possible to simplify the design of the seat and ensure a high aesthetic appearance.

In the second aspect of the present invention, the operating lever is exposed from the skin material and is visible to the user of the chair, so that it is obvious to the user that the chair can adjust the front and rear positions of the seat. Therefore, it is possible to realize a simple design and improve the product value while making the user aware of the function of adjusting the seat's longitudinal position.

In claim 3, the relief portion of the skin material can be fixed, for example, with a tacker, and since the fixing portion is covered with a cover, the relief portion can be beautifully processed. Excellent aesthetics can be achieved in this aspect as well.

It is a figure showing the appearance of the chair concerning an embodiment, (A) is a perspective view seen from the front, (B) is a side view, and (C) is a perspective view seen from the lower side. (A) is an exploded perspective view, and (B) is an exploded perspective view of the seat support shell body and the support mechanism. It is a perspective view of the state where a seat is turned over. FIG. 3 is an exploded perspective view of the seat and the seat support shell body in an upside down state. FIG. 2 is an exploded perspective view of the seat and the seat support shell body in a state where the seat support shell body is turned over and the seat support shell body is raised; It is a perspective view in which the seat and the seat support shell body are turned over and separated, and the lever device is separated.

Next, embodiments of the present invention will be described based on the drawings. In this embodiment, words such as front and back and left and right are used to specify the direction, but these are based on the state seen from a person sitting normally on a chair. The front view direction is the direction facing the seated person.

(1).Outline of the chair First, the outline of the chair will be explained with reference to FIGS. 1 and 2. As shown in FIG. 1, the chair includes a leg device 1, a seat 2, and a backrest 3 as main elements, and a headrest 4 is disposed above the backrest 3. Further, the chair of this embodiment is equipped with an armrest 5 as a standard item. The leg device 1 has a leg support 6 made of a gas cylinder and branch parts extending in the radial direction, and a caster is provided at the tip of each branch part. A substantially box-shaped base 7 with an upward opening is fixed to the upper end of the leg support 6.

As shown in FIG. 2(B), a pair of left and right front links 9 are attached to the front end of the base 7 via a front shaft 8 so as to be tiltable rearward.

Similarly, as clearly shown in FIG. 2(B), forward-facing arm portions 11 of the tilting frame 10 are arranged on both left and right sides of the base 7, and the forward-facing arm portions 11 are attached to the base 7 by a hollow shaft (not shown). It is connected so that it can be tilted backwards. Furthermore, left and right support sections 12 are provided at the rear of the tilting frame 10, and a backrest 3 and armrests 5 are attached to the support support sections 12.

The front end of the forward-facing arm portion 11 constituting the tilting frame 10 is connected to the base 7 via the left and right longitudinal hollow shafts as described above, and therefore the backrest 3 is centered around the front end of the tilting frame 10. Tilt backwards. A torsion bar (not shown) as an example of a spring means is built into the hollow shaft, and the tilting frame 10 tilts backward against the elasticity of the torsion bar.

As shown in FIG. 2(B), in the tilting frame 10, the left and right support portions 12 are integrally formed with a lower stay 13 and an upper stay 14 that are gently curved so as to bulge out backward (concave in front) in a plan view. The left and right support portions 12 and the upper and lower stays 13 and 14 constitute a base of the tilting frame 10, and separate forward arm portions 11 are fixed to both left and right ends of the base. The backrest 3 is attached to a support column 12 and an upper stay 14.

As shown in FIG. 2(A), the seat 2 includes a seat plate (inner shell) 15 made of synthetic resin and a cushion body 16 disposed on the upper surface of the seat plate 15. covered from above. As shown in FIG. 2(A), a large number of reinforcing ribs are formed on the upper surface of the seat plate 15. As shown in FIG. 6, a recess 16a into which the seat plate 15 fits is formed in the lower surface of the cushion body 16. Therefore, the outer peripheral portion of the cushion body 16 protrudes to the outside of the seat plate 15, and the lower surface of the cushion body 16 and the lower surface of the seat plate 15 are smoothly continuous.

The seat plate 15 is attached to a seat support shell body 18 disposed below the seat plate 15 so as to be adjustable in its longitudinal position. As shown in FIG. 2(B), the front part of the seat support shell body 18 is connected to the previously described front link 9 with left and right longitudinal front pins 19, and the rear part of the seat support shell body 18 is connected to the tilting frame 10. It is connected to a rear link 20 projecting upward from the forward arm portion 11 by left and right longitudinal rear pins 21. Therefore, when the backrest 3 tilts back, the seat 2 also moves backward and tilts back.

The front part of the seat support shell body 18 is provided with left and right front bearings 23 into which the front pin 19 is fitted, and the rear part of the seat support shell body 18 is provided with left and right rear bearings 24 into which the rear pin 21 is fitted. . Note that a rod portion 25 projects downward from the rear bearing located inside of the left and right rear bearings 24, and this bar-shaped rod portion 25 tilts the headrest 4 forward relative to the backrest 3 when rocking. It is for.

(2) Seat and seat support shell body As shown in FIGS. 3 to 6, the seat plate 15 and seat support shell body 18 have a substantially rectangular shape with rounded corners. A recess 27 with a downward opening (concave upward) is formed in which the seat supporting shell body 18 is completely inserted. Therefore, even when viewing the chair from the side, the seat support shell body 18 is difficult to see.

The recess 27 is considerably longer than the longitudinal width of the seat support shell body 18 in order to allow the seat plate 15 to slide back and forth. A group of slits 28 are formed in the interior of the recess 27 where the body pressure of the seated person is most strongly applied to stretch and deform the seat to improve cushioning and fit. Note that the seat plate 15 and the seat support shell body 18 are molded products of synthetic resin.

As shown in FIG. 5, a lower front rail 29 and a lower rear rail 30 are formed on the upper surface of the seat support shell body 18 near both left and right ends, while a lower front rail 29 and a lower rear rail 30 are formed in the upper surface of the seat plate 15. An upper front rail 31 that is slidably mounted on the lower front rail 29 from above, and an upper rear rail 32 that is slidably mounted on the lower rear rail 30 from above are formed on both sides.

The lower rear rail 30 has a shorter length than the lower front rail 29 and is higher than the lower front rail 29. Corresponding to the difference in height between the lower rails 29 and 30, the upper rear rail 32 is lower than the upper front rail 31.

In addition, a front-rear longitudinal retaining protrusion 34 having a pair of horizontal pieces 33 projecting on both left and right sides is provided upwardly protruding from the left and right intermediate portions of the approximately front half of the seat support shell body 18 . A hook-shaped holding body 35 that holds the horizontal piece 33 of the retaining protrusion 34 is protruded downward on the lower surface, and these retaining protrusions 34 and the holding body 35 hold the seat plate. 15 is held upward and cannot be removed.

Further, a hook-shaped retaining pawl 36 facing outward when seen from the front is provided at a portion near the front end of the seat support shell body 18 to protrude upward, while a portion of the recess 27 in the seat plate 15 is located closer to the group of slits 28 . A long hole 37 is formed in the front portion, into which a retaining pawl 36 enters, and the retaining pawl 36 and the long hole 37 also prevent the seat plate 15 from coming off upward from the seat support shell body 18. is maintained.

Furthermore, a front bulge 38 into which the upper end of the front link 9 shown in FIG. There is. Further, the seat support shell body 18 is formed in the shape of a shallow tray with a downward opening, and the outer peripheral part is constituted by a peripheral wall 40, and the rear part of the seat plate 15 is in contact with or in close proximity to the rear part of the peripheral wall 40. There is.

Furthermore, groups of reinforcing vertical ribs 41 and reinforcing lateral ribs 42 that intersect with each other are formed on the upper surface of the front half and the upper surfaces of both left and right sides of the seat support shell body 18. Further, in the recess 27 of the seat plate 15, the position of the elongated elongated hole 37 serves as a longitudinal auxiliary rail 43 that is slidably mounted on the reinforcing horizontal ribs 42 of the seat supporting shell body 18.

Note that the longitudinal length of the recess 27 is slightly larger than the maximum stroke of the longitudinal movement of the seat 2, and when the seat 2 is fully advanced, the seat plate 15 is placed on the seat support shell body 18 from above. By overlapping, the fitting between the retaining protrusion 34 and the holding body 35 and the fitting between the retaining claw 36 and the elongated fixing hole 37 are allowed. In this state, the slider 50 of the lever device 48 is located in front of the group of engaging portions 55, and by retracting the slider 50, the seat 2 is fully retracted and the slider 50 is positioned in front of the group of engaging portions 55. Can be installed. Then, when the seat plate 15 is moved back a little while the slider 50 is kept retreating, and the slider 50 is positioned in the area where the engaging portion 55 is located, the seat plate 15 is held so as not to be detachable in the forward direction.

(3).Lever Device As shown in FIGS. 5 and 6, a lever device 48 for adjusting the front and back position of the seat plate 2 is attached to the right side of the seat plate 15. As shown in FIG. 6, the lever device 48 includes a slider 50 disposed in a land portion 49 formed in the recess 27 of the seat plate 15 so as to be slidable left and right, and a spring 51 that biases the slider 50 in the forward direction. It includes a rotary operation lever 52 that allows the lock portion 54 to retreat against a spring 51, and a cover 53 that holds the slider 50 and the operation lever 52 so that they do not separate from the seat plate 15.

The land portion 49 is formed between the lower front rail 29 and the lower rear rail 30, and forms a rib 49a that holds the slider 50 so that it does not shift back and forth. Therefore, the land portion 49 has a groove shape.

On the other hand, by intermittently providing a plurality of outward ribs on the lower front rail 29 on the right side of the seat support shell body 18, the plurality of engaging portions 55 into which the lock portions 54 provided on the slider 50 engage and disengage can be aligned in the front-rear direction. It is formed by lining up. Therefore, by changing the position of the engaging part 55 into which the locking part 54 fits, the front and back position of the seat 2 can be adjusted in multiple stages.

Further, the slider 50 is formed with a left and right longitudinal downward bulging portion 57, and a locking portion 54 is provided to protrude downward from the downward bulging portion 57, and a spring 51 is disposed inside the downward bulging portion 57. are doing. The left end of the spring 51 is in contact with the slider 50, and the right end of the spring 51 is in contact with a spring receiving projection 58 provided on the land portion 49. As a result, the slider 50 is urged in the forward direction so that the lock portion 54 fits into the engagement portion 55. Further, a downward stopper piece 59 that corresponds to the rear end (right end) of the land portion 49 is provided at the rear end (right end) of the slider 50, thereby defining the forward position of the slider 50.

A horizontal recess 60 is formed on the right side of the seat plate 15 and is located on the right side of the land portion 49 and communicates with the recess 27. The upward base 52a of the operating lever 52 is inserted into the horizontal recess 60. There is. The upward base 52a of the operating lever 52 is formed with a frame 61 that opens left and right, while the horizontal recess 60 is formed with a locking piece (not shown) that fits into the frame 61. Thereby, the operating lever 52 can be rotated around the longitudinal axis. The cover 53 fits into the stepped portion 67.

Further, a downward hook piece 62 is formed on the upward base portion 52a of the operating lever 52, while a shaft portion 63 with which the downward hook piece 62 engages is formed on the right end of the slider 50. Due to the engagement relationship between the piece 62 and the shaft portion 63, when the operating lever 52 is pulled upward and rotated, the slider 50 retreats against the spring 51.

A relief hole 64 into which the operating lever 52 enters is formed in the cover 53, and a pair of front and rear engagement pieces 65 are fitted into engagement holes 66 formed in a horizontal recess 60 of the seat plate 15. Therefore, the cover 53 is held by the seat plate 15 so as not to come off. Further, the slider 50 is held by the cover 53 so that it does not fall downward (the slider 50 is supported by the seat supporting shell body 18, so it is held so that it cannot fall. Therefore, the cover 53 and the seat plate It is flush with the side part of 15.

As shown in FIGS. 4 and 5, a dummy land portion 69 symmetrical to the land portion 49 is formed on the left side of the recess 27 of the seat plate 15.

(4).Skin material/Summary In Figures 1, 3 to 5, the skin material 17 is partially shaded, and the area where the skin material 17 is placed is shown with parallel diagonal lines (therefore, the skin material 17 is shown with parallel diagonal lines). (Diagonal lines do not indicate cross sections). As clearly shown in FIGS. 3 to 5, the peripheral edge of the skin material 17 is rolled up below the seat plate 15 and then reaches the recess 27.

The peripheral edge of the skin material 17 is fixed to the seat plate 15 inside the recess 27, but as a fixing means, the peripheral edge of the skin material 17 can be extended to the bottom surface of the recess 27 and fixed to the bottom surface by tacking or welding. Alternatively, it is also possible to fix the peripheral portion to the inner peripheral surface or bottom surface of the recess 27 by adhesive. In any case, since the skin material 17 is inserted into the recess 27, the material color of the seat plate 15 is not exposed to the outside.

Since the operating lever 52 must be exposed, a relief portion 68 (see FIGS. 3 to 5) is formed in the skin material 17 to expose the operating lever 52. The relief portion 68 is formed in the shape of a square hole in FIGS. 3 and 4, and is formed as a U-shaped cutout in FIG. In any case, the inner peripheral edge is fixed to the stepped portion 67 of the seat support shell body 18 with a tacker, and the tacker is covered with a cover 53. Therefore, the inner peripheral portion of the relief portion 68 overlaps with the cover 53.

In the above configuration, the seat support shell body 18 is entirely inserted into the recess 27 of the seat plate 15 and does not protrude below the seat plate 15, so that it cannot be seen by a person sitting on another chair, for example. , the seat support shell body 18 does not come into view. Since the skin material 17 wraps around the seat plate 15 and reaches the recess 27, the seat board 15 is also covered by the skin material 17. Therefore, the seat of the chair looks as if it is formed only by a cushion body, and although the chair can adjust the front and back position of the seat 2, it has a simple design. This can be said to improve the product value.

On the other hand, since the operating lever 52 is exposed on the outside of the skin material 17, it is obvious at a glance that the chair 2 can adjust the front and back position of the seat 2, and there is no problem of failing to recognize the function of adjusting the front and back position of the seat 2. be. Therefore, the design can be simplified while ensuring the ability to adjust the front and back position of the seat 2.

In particular, when the seat support shell body 18 is supported by the base 7 via the front and rear links 9 and 20 as in the embodiment, a large space is left below the seat 2, so that the seat support shell body 18 If the seat support shell body 18 is exposed below the seat board 15, it becomes easy to see the seat support shell body 18, which tends to cause aesthetic problems. However, in this embodiment, the skin material 17 is hidden inside the seat board 15 and cannot be seen. Therefore, even if there is a large space below the seat 2, the appearance will not deteriorate due to the exposure of the seat support shell body 18.

As in the embodiment, if the inner peripheral part of the relief part 68 for allowing the operation lever 52 to come out is covered with the cover 53 while being fixed with a tacker, there is an advantage that the outer skin material 17 can be maintained in a taut state and the appearance can be improved. be.

The present invention can be embodied in various other ways. For example, the seat support shell body does not necessarily need to be supported by links (it is also possible to attach it directly to the seat support shell body base). Furthermore, the seat back and forth sliding mechanism and lever device can be embodied in various ways.

The present invention can be embodied in a chair. Therefore, it can be used industrially.

1 Leg device 2 Seat 6 Leg support 7 Base 9 Front link 15 Seat plate 16 Cushion body 17 Outer skin material 18 Seat support shell body 20 Rear link 27 Recess 48 Lever device 50 Slider 52 Operation lever 55 Engagement portion 60 Sideways recess 68 Relief Department

Claims (3)

It includes a seat support shell body supported by a base provided at the upper end of the leg support, and a seat attached to the seat support shell body so as to be movable back and forth,
The seat includes a seat plate, a cushion body disposed on the upper surface of the seat plate, and a skin material covering the cushion body from above,
A recess that is recessed upward so that the seat support shell body can fit into the lower surface of the seat is formed to be longer than the longitudinal length of the seat support shell body so as to allow fore and aft movement of the seat,
Furthermore, the skin material is rolled up below the seat plate and reaches into the recess .
Chair. An operating lever for adjusting the front and back position of the seat is arranged on one or both of the left and right sides of the seat plate in a state exposed from the skin material.
A chair according to claim 1. A relief portion for exposing the operating lever is formed in the skin material, and a peripheral portion of the relief portion is covered with a cover having a hole for exposing the operating lever.
A chair according to claim 2 .

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