JP5467753B2 - Rocking chair - Google Patents

Description

  The present invention relates to a rocking function of a type in which a seat moves backward and backwards in conjunction with the backward tilting of the backrest.

  Chairs whose seats are retracted and tilted in conjunction with the back tilt of the backrest are widely used, including office chairs, and various configurations have been proposed or implemented for mechanisms for interlocking the seat with the backrest. For example, in Patent Document 1, in a chair of a system in which a backrest is attached to a back frame that is connected to a base so as to be tiltable rearwardly, a downward projection is provided at the front of the seat, and the downward projection is coupled to the seat. Further, it is disclosed that the seat is allowed to tilt backward while being slightly retracted, and that the seat and the back frame are connected by a link.

On the other hand, in Patent Document 2 relating to the invention of the present inventor, the seat is connected to the base by the front and rear links of the first link and the second link, thereby allowing the seat to move backward and backward, and the seat. It is disclosed that the seat and the back frame (backrest) are interlocked by connecting the back frame and the back frame by a third link.
JP 2003-250651 A US Pat. No. 6,709,057

  One of the purposes of retreating and tilting the seat in conjunction with the back tilt of the backrest is to prevent as much as possible the gap between the seat and the backrest from being widened when locking and to suppress the phenomenon of back slip or shirt drooping. There is. In other words, when the seat and the backrest are relatively separated during rocking, the back of the seated person slips downward with respect to the backrest, causing the shirt to bend and giving the person a sense of incongruity and discomfort. Therefore, in order to prevent the relative distance between the seat and the backrest from changing as much as possible during locking, the seat is moved backward while being retracted.

Therefore, Patent Documents 1 and 2 are considered. Patent Document 1 essentially connects the front part of the seat to the base, and the height and the front-rear position of the front part of the seat when not locked and when locked. Since there is almost no difference, the function of making the seat follow the backrest cannot be expected. Therefore, it can be said that the effect of preventing the back slip or shirt dripping phenomenon cannot be expected.

  On the other hand, in Patent Document 2, since the link mechanism close to the parallel link mechanism is configured by the first link and the second link, by selecting the length and the backward tilt angle between the first link and the second link, It can be said that the seat can be retreated greatly, and therefore, it is excellent in the function of preventing back slip or shirt drooping phenomenon. Further, the interlocking mechanism using the link has an advantage that the structure is simple.

  The invention of the present application is to improve the function of the chair accurately while following the method of connecting the seat to the base with a link as in Patent Document 2.

  A rocking chair to which the present invention is directed is a seat on which a person sits, a backrest on which a seated person can lean, a base disposed below the seat, and a base that is tiltable to the back. A back frame provided with a backrest, and the backrest and the back frame are integrally tilted backward. As for the back frame, “the back is provided” includes both the case where the back frame forms a part of the back and the case where the back and the back frame are separate members. .

In the invention of claim 1, the seat and the base are connected by a front link so that the seat tilts backward while retracting from the base, and the seat and the back frame are further connected to the back frame. The seat and the back frame are connected by a rear link so that the seat tilts backward at a smaller angle than the back frame when the back is tilted, and the seat and the back frame prevent the seat alone from moving alone. The guide means is connected with a pin provided on a seat with a guide long hole provided in the back frame, or a pin provided on the back frame. Is fitted with a guide slot provided in the seat.
The front link and its function rotate with respect to the seat and the base, and the rear link also rotates with respect to the seat and the back frame.

Rocking chair according to the invention of claim 2, in claim 1, before SL front links arranged in front of the pivot point of the back frame, wherein the rear link is arranged behind the pivot point of the back frame Yes.

  In the present invention, the seat includes a plurality of members that are vertically overlapped. In this case, the upper layer member may be attached to the lower layer member so that the front-rear position can be adjusted.

  In the present invention, the seat is connected to the base and the back frame by a link, but the length and position of the link can be arbitrarily selected as necessary, so that the seat can be largely retracted following the backrest. As a result, it is possible to prevent or remarkably suppress the so-called shirt turn-up phenomenon caused by the relative separation of the seat and the backrest during locking.

  And since the seat is held by the guide means so as not to rotate alone, the seat is held in a stable state regardless of whether it is not locked or not locked, but the guide means is held between the seat and the back frame. Since the seat is provided, the seat can be moved backwards greatly (in the case of Patent Document 2, the seat is controlled by the rotation of the link 8 shown in FIG. There is a limit to how much the seat can be retracted.)

Can employ various aspects as the guide means, when employing the fitting because alignment between the pins and slots as claimed in claim 2, since the long hole becomes longer extending form roughly longitudinal direction, the load of the seated person pins Thus, there is an advantage that the stability of the seat can be further improved. In addition, if a link is used as a guide means, the seat moves up and down while moving back and forth with respect to the back frame, but if a combination of a pin and a long hole is used, the seat hardly moves up and down with respect to the back frame. Therefore, the seat can move smoothly .

The positional relationship between the pivot point of the back frame, the front link, and the rear link can be set in various ways. However, if the pivot point of the back frame is too close to the front, the rocking angle of the backrest cannot be increased. If the pivot point is too close to the rear, the backrest tends to retreat excessively at the time of locking, and the measure for causing the seat to follow is troublesome. In this respect, if the front link and the rear link are arranged before and after the rotation fulcrum of the back frame as in claim 2, the seat can be accurately adjusted to the movement of the backrest while maintaining the back tilt angle appropriately. It can be made to follow and is suitable.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a swivel chair frequently used for office work. 1 to 14 show the first embodiment, and FIG. 15 shows the second embodiment. Hereinafter, the first embodiment will be described in order.

(1). Outline of First Embodiment FIG. 1 is a side view of a chair, FIG. 2 is a rear view with a part omitted, FIG. 3 is a side view with a member separated, and FIG. 4 is a schematic side view in a locked state. 5A is a partially broken side view, FIG. 5B is a schematic rear view with members separated, FIG. 6A is a longitudinal side view of a chair, and FIG. 5B is a backrest. 6 is a vertical side view of the lower part of FIG. 6, and (C) is a vertical side view of the upper part of the backrest 6. First, an outline of the chair will be described based on these drawings.

  As shown in FIG. 1, the chair has, as main elements, a leg device 1 having a leg column 2, a base 3 fixed to the upper end of the leg column 2, a seat 4 disposed above the base 3, and a backrest. 6, a frame device 5, a headrest device 7 attached to the backrest 6, and armrest devices 8 arranged on the left and right of the seat 4. The armrest device 8 is fixed to the frame device 5. However, since the armrest device 8 is not related to the present invention, a description thereof will be omitted below. The armrest device 8 is an optional item and may not be attached.

  The leg 1 is provided with a plurality of branch legs 9 extending radially, and a caster 10 is provided at the tip of each branch leg 9. The leg support 2 uses a gas cylinder that can be expanded and contracted, and thus includes an outer cylinder and an inner cylinder. The back frame 5 includes swing frames 11 that extend in the front-rear direction on both the left and right sides of the base 3.

  The swing frame 11 is connected to the base 3 by a first shaft 12 so as to tilt backward about its front end. A back column 11a extending upward is integrally formed at the rear portion of the swing frame 11, and a back frame 13 constituting an outline (periphery) of the backrest 6 is fixed to the left and right back columns 11a with screws. In the present embodiment, the back frame 5 includes the swing frame 11 and the back frame 13, but the back frame 13 is also a constituent element of the backrest 6.

The back frame 13 basically has a shape close to a vertically long quadrangle (substantially trapezoidal) when viewed from the front . Therefore, the vertically long side members 14 constituting the left and right side portions of the backrest 6 and the upper portion of the backrest 6 are configured. The upper member 15 is substantially horizontally long (horizontal), and the lower member 16 is substantially horizontally long and constitutes the lower part of the backrest 6. The backrest 6 is configured by stretching a net-like material 17 on the back frame 13.

  As shown in FIGS. 6B and 6C, the net-like material 17 is attached by forming grooves 46 on the outer peripheral surface of each member constituting the back frame 13 and A fixed edge member 45 is fitted in the groove 46. Of course, it can be attached by other means.

The front part of the seat 4 and the front part of the base 3 are connected by a front link 18, and the seat 4 can be tilted backward while moving backward by tilting the front link 18 backward. Further, left and right guide pins 19 projecting sideways toward the swing frame 11 are provided near the rear portion of the seat 4, while the guide pins 19 slide on the opposite inner surfaces of the left and right swing frame 11. The guide slot 20 that can be fitted is open in a laterally open state. The guide pin 19 and the guide slot 20 are examples of guide means for preventing only the seat 4 from moving.

  As can be understood from FIG. 3, the seat 4 is tilted backward, retracted, and lowered together with the backward tilting of the backrest 6 by the guide action of the front link 18, the guide pin 19, and the guide slot 20. In this case, since the guide slot 20 extends approximately in the front-rear direction (that is, tilted in a non-locking posture and tilted in a side view but in a horizontal posture), the guide pin 19 is used as a guide. The seat 4 is supported on the lower inner surface of the long hole 20 so as not to slide, and the seat 4 is held in a stable state even when a load is applied. Needless to say, the degree of backward inclination of the seat 4 is smaller than the degree of backward inclination of the backrest 6.

  For example, as shown in FIG. 3, the chair includes left and right rear links 21 connected to the seat 4 and the frame device 5 so as to be rotatable relative to each other, and left and right lumbar pads overlapping the front surfaces of the upper ends of the left and right rear links 21. (Spacer) 22. The lumbar pad 22 supports the left and right side portions of the net-like material 17 from the back side. The rear link 21 includes a lower portion 21a that substantially overlaps the swing frame 11 and an upright portion 21b that extends upward from the rear end thereof, and has a generally L-shaped shape. The lower link 21a and the upright portion 21b Are connected to the side member 14 of the back frame 13 by a pin 51, and an upward projection 21c formed at the front end of the lower portion 21a is connected to the rear portion of the seat 4 by a pin 49.

The rear link 21 and the lumbar pad 22 constitute tension adjusting means for the net-like material 17, and when the backrest 6 tilts backward, the upright portion 21 b of the rear link 21 tilts backward relative to the back frame 13. Thus, the net-like material 17 is loosened around the portion supported by the lumbar pad 22 during locking.

The headrest device 7 includes a headrest 23 against which a person's head hits and left and right support frames 24 to which the headrest device 7 is attached. The left and right support frames 24 are connected to each other by a horizontally long reinforcing frame 25. The bottom portions of the left and right of the support frame 24 has become a pivot portion 24a overlapping the four sides of the side members 14 of the back frame 13, the upper end of the pivot portion 24a is connected to the side members 14 at the left and right horizontal pin 26.

  When the backrest 6 is tilted backward, the lower end of the pivotal support 24a is pushed backward by the pin 58 provided at the upper end of the rear link 21, thereby the headrest 23 moves forward relative to the backrest 6. In FIG. 4, the headrest device 7 is displayed in (A), but the headrest device 7 is not displayed in (B).

It is one of the features of the present embodiment that the headrest 23 moves forward relative to the backrest 6 at the time of locking, but this feature can suppress the person's head from warping too much at the time of locking. Therefore, for example, there is an advantage that the display of the personal computer can be easily viewed without raising the head in the locked state, and there is no need to lift the book when reading.
As can be inferred from FIGS. 3 and 6, the lumbar pad 22 is formed with a groove 55 that fits in the upper portion of the rear link 21, and one chevron 56 is formed in this groove 55 so as to protrude backward. On the other hand, the rear link is formed with multiple recesses 57 into which the projections 56 are fitted and removed. Therefore, the height of the lumbar pad 22 can be adjusted stepwise.

(2) Details of the locking mechanism Hereinafter, the structure and movement of each part will be described in detail with reference to the drawings in FIG. First, the basic structure of the chair such as the structure of the base 3 and the locking mechanism will be described with reference to FIGS. 7 is a partially broken plan view of the seat portion, FIG. 8 is a partial plan view of the location of the locking spring, FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 7, and FIG. It is.

  As shown in FIG. 6 (A), the base 3 is formed in a hollow shape by a shallow box-shaped main body 28 opened upward and a lid 29 having a downward opening fixed to the upper surface thereof with a bolt. As shown in the figure, the planar shape is slightly longitudinally narrowed backward (of course, the shape can be freely selected). The leg support 2 is fitted to the rear part of the main body 28. The first shaft 12 is sandwiched between the main body 28 and the lid 29 from above and below. For this reason, the main body 28 and the lid 29 are formed with a halved bearing portion 30 projecting leftward and rightward. .

  There is a gap between the half-shaped bearing portion 30 and the swing frame 11, and for this reason, a collar 31 is fitted on the first support shaft 12. The first support shaft 12 is fixed to the left and right swing frames 11 so as not to rotate relative to each other.

  A downwardly-facing recess 28b is formed in the body 28 constituting the base 3 at a position in front of the leg column 2, and a substantially vertical support shaft 32 is attached to the recess 28a by screwing. A locking spring (coil spring) 33 is fitted from above. The first shaft 12 is attached with an arm-shaped spring retainer 34 extending rearward from the first shaft 12 so as not to be relatively rotatable. The tip of the spring retainer 34 is bifurcated so as to overlap the locking spring 33 from above without interfering with the support shaft 32, and the backrest 6 tilts backward against the locking spring 33.

  In the present embodiment, the first shaft 12 is circular, and the spring retainer 34 is fixed to the first shaft 12 by welding or pinning. For example, the first shaft 12 is formed in a square shape such as a square cross section. Thus, the spring retainer 34 and the first shaft 12 can be fitted so as not to rotate relative to each other (this is the same for the fixing structure of the first shaft 12 and the swing frame 11). Also, the form and arrangement of the locking spring can be embodied in various ways. For example, a torsion spring, a leaf spring, or a torsion bar can be used as the spring means.

  A horizontally long cylindrical bearing portion 28b for connecting the front link 18 is integrally formed at the front portion of the main body 28 constituting the base 3, and the second shaft 35 inserted through the cylindrical bearing portion 28b. The lower part of the front link 18 is connected to the main body 28. The cylindrical bearing portion 28b may be provided separately on both the left and right sides of the main body 28, and the second shaft 35 can be separated separately on the left and right.

For example, as shown in FIGS. 3, 6A, and 9, the seat 4 has a structure in which an inner shell 37 is fixed to a resin seat receiver 36 and a cushion 38 is stretched on the upper surface thereof. The seat receiver 36 has a left-right width that enters between the left and right swing frames 11, and includes a side plate 36a facing downward on the left and right . A thick-walled front bearing portion 39 is integrally formed at the front portion of the left and right side plates 36a of the seat receiver 36, and the upper end of the front link 18 is respectively connected to the front bearing portion 39 by a horizontally elongated third shaft 40. It is connected. Note that the third shaft 40 can be continuous.

As shown in FIG. 7, the seat receiver 36 has a large hole 41 for allowing the seat inner shell 37 to sink and deform due to human body pressure (of course, there is no hole 41). It is also possible to adopt a mesh structure for the seat 4). For example, in Figure 9, the seat 4 depicts the state in which the inner shell 37 and the seat supports 36 are in close contact, in fact, between the seat 4 and the inner shell 37 and the seat supports 36, at its most There is a gap.

The left and right side plates 36a of the seat support 36 are integrally formed with a thick rear-facing rear bracket 42 at a portion close to the rear end thereof , and the guide guide pin 19 is attached to the lower end of the rear bracket 42. Protrusively facing. On the other hand, as shown in FIGS. 7 and 10, the swing frame 11 has a guide slot 20 into which the guide guide pin 19 is slidably fitted, as described above. The swing frame 11 is a metal processed product such as an aluminum die-cast, and basically has a hollow shape opened inside, and a reinforcing rib is provided in the hollow portion.

(3). Summary swing frame 11 of the first embodiment has a posture tilted forward in a loose angle to the horizontal in a side view, but for example, as shown in FIG. 10, the oblong guiding hole 20, In a side view, the posture is inclined forward by a slight angle relative to the swing frame 11. Due to the tilt angle relationship between the swing frame 11 and the guide slot 20, the seat 4 is tilted backward, retracted, and lowered in conjunction with the backrest 6, and a comfortable feeling of use that is ergonomically comfortable. Can be obtained.

Now, when a link is used as the guide means for the seat 4, the change rate of the rotation angle of the link and the change rate of the retraction amount and the lowering amount of the seat 4 are not proportional to each other. There is a risk that the movement will not be smooth as it descends or retreats. When employing guide means the guide pin 19 and guide slot 20 as in this embodiment, on the other hand, since the guide slot 20 extends linearly, hand seat 4 upon locking the swing frame Therefore, the seat 4 moves without a sense of incongruity.

  Furthermore, since the guide slot 20 is tilted forward in a non-locking state, the degree of backward tilting of the seat 4 relative to the degree of backward tilting of the backrest 7 during locking is reduced, and the body bends and becomes selfish when locking. Is prevented. As described above, since the elongated guide hole 20 extends linearly and tilts forward, it is possible to obtain a comfortable feeling of use that is ergonomically comfortable when locking.

As shown in FIG. 1, in the non-locking state, the seat 4 is in a substantially horizontal posture in a side view, and the swing frame 11 is in a backward tilted posture. Therefore, the seat 5 and the swing frame 11 intersect at a certain angle θ. When rocking, the seat 4 moves backward while tilting in conjunction with the backward tilting of the backrest 5, but the front link 18 rotates and the seat 4 moves down as a whole, and the seat 4 swings. Since the relative position with respect to the frame 11 is regulated by the guide pin 19 and the guide slot 20, the rearward tilt angle of the seat 4 is much smaller than the rearward tilt angle of the swing frame 11. For this reason, although it is a chair which can rock the backrest 5 largely, it can prevent that a body bends and becomes selfish at the time of rocking.

  In the present embodiment, the rear link 21 is connected to the back frame 13, but the rear link 21 may be connected to the swing frame 11. The pin 51 is a concept including screws, rivets and the like, and a boss portion corresponding to the pin 51 can be formed on the back frame 13 or the swing frame 11. Further, the swing frame 1 and the back frame 13 can be integrated.

  When only the front link 18 and the rear link 21 are present, or when only the front link 18 and the guide means 19 and 20 are not present, the seat 4 cannot move independently and maintain stability. Since the rear link 21 and the guide means 19 and 20 exist and are regulated to each other, the seat 4 moves in conjunction with the back frame 5 and the backrest 6 without moving independently.

(4) Other Embodiments and Reference Examples In the first embodiment, the rear link 21 has a function of moving the lumbar pad 22 back and forth. However, as shown in FIG. 11 as the second embodiment, the rear link 21 It is also possible to adopt a configuration that merely has a function of connecting the seat 4 and the back frame 5 (or the swing frame 11).

FIG. 12 shows a reference example similar to the present invention. This reference example is common to the first and second embodiments in that the rear link 21 is not provided, and the first embodiment and the second embodiment are the auxiliary link 115 with the seat 4 and the base 3. Are different in that they are connected. The upper end of the auxiliary link 60 is connected to the guide pin 19, but may be connected to other parts of the seat 4 with other pins. In connecting the auxiliary link 115 to the base 3, the seat 4 is allowed to move backward by making the hole into which the pin 61 fits into the long hole 62.

(5). Others The present invention can be embodied in various ways other than the above embodiment. For example, the application target is not necessarily limited to the rotary chair, and can be applied to a fixed chair such as a theater chair or a bench. The backrest can be a system in which a cushion is stretched on a resin back plate (inner shell) .

It is a side view of the chair concerning a 1st embodiment. It is the rear view which abbreviate | omitted one part. It is a side view in the state where a member was separated. It is a schematic side view of a rocking state, (A) displays a headrest device, (B) does not display a headrest device. (A) is a partially broken side view, (B) is a schematic rear view with the members separated. (A) is a vertical side view of the chair, (B) is a vertical side view of the lower part of the backrest, and (C) is a vertical side view of the upper part of the backrest. It is a partially broken top view of a seat part. It is a partial top view of the location of a locking spring. FIG. 8 is a cross-sectional view taken along the line IX-IX in FIG. 7. FIG. 8 is a cross-sectional view taken along line XX in FIG. 7. It is a figure which shows 2nd Embodiment. It is a figure which shows a reference example.

DESCRIPTION OF SYMBOLS 1 Leg apparatus 3 Base 4 Seat 5 Frame apparatus 6 Backrest 7 Headrest apparatus 11 Swing frame which comprises back frame 13 Back frame which comprises backrest and back frame 14 Back frame side member 19 Guide pin 20 which comprises guide means Guide hole that constitutes the guide means

Claims (2)

A seat on which a person sits, a backrest on which a seated person can lean, a base disposed below the seat, and a back frame connected to the base so as to be able to tilt backward and provided with a backrest. And the backrest and the back frame are configured to tilt backward integrally.
The seat and the base are connected by a front link so that the seat tilts backward while moving backward with respect to the base, and further, the seat and the back frame are separated from the back frame when the back frame is tilted backward. It is connected with a rear link so as to tilt backward at a small angle,
The seat and the back frame are connected by guide means so as to allow relative movement between the seat and the back frame while preventing the seat alone from moving alone, and the guide means is connected to the back frame. Fitting with the pin provided on the seat with the guide long hole provided on the pin, or the pin provided on the back frame with the guide long hole provided on the seat,
Rocking chair. The front link is disposed in front of the pivot point of the back frame, and the rear link is disposed behind the pivot point of the back frame;
The rocking chair according to claim 1.