JP2008302083A - Rocking chair - Google Patents

Abstract

In a synchro-type chair in which a seat is attached to an intermediate bracket that is retracted and tilted backward during locking, safety exceeding a standard excellent in a child guard function is ensured.
The seat 3 is provided with a seat outer shell 15, and the seat outer shell 15 is attached to the side frames 31 'and 31 "of the intermediate bracket 17 so that the front and rear positions can be adjusted. The base 2 is covered with a base cover 52, and intermediate covers 55 and 56 are attached to the side frames 31 'and 31''. The lower ends of the intermediate covers 55 and 56 are in close contact with the outer surface of the base cover 52 over the entire longitudinal direction. For this reason, even if the infant is rocking while the chair is touching, the finger is not pinched between the intermediate bracket 17 and the base cover 52.
[Selection] Figure 11

Description

  The present invention relates to a synchro-type rocking chair in which a seat tilts backward (and retreats) in conjunction with a backrest.

  As one type of rocking chair, there is a synchro type in which when the backrest tilts backward (locks), the seat also recedes back together. This synchro-type chair can prevent or suppress so-called shirt drooping and back slippage by retreating the seat when rocking, and can improve comfort by tilting the seat backward when rocking. For this reason, it is widely used in office chairs.

  Various mechanisms have been proposed and implemented as means for synchronizing (synchronizing) the seat with the backrest. As an example, a base fixed to the upper end of the leg strut and an intermediate bracket (intermediate) to which the seat is attached. There is a kind of link system in which three members of a support body and a tilting frame to which a backrest is attached are connected so as to be relatively rotatable by a shaft (pin), and examples thereof are disclosed in Patent Documents 1 and 2.

The seat may have an outer shell made of resin or the like as a strength member. In this case, it is possible to directly connect the outer shell to the base and tilting frame. As disclosed in the literature, there is an advantage that the seat can be attached to the intermediate metal fitting so that the front-rear position can be adjusted.
JP 2003-135196 A Japanese Utility Model Publication No. 2005-131251

  In both cited references, there is a gap between the intermediate metal fitting and the base, and the interval between the gaps tends to be reduced by locking. For this reason, if a person locks with a finger inserted in the space between the intermediate metal fitting and the base, the finger may be pinched between the intermediate metal fitting and the base, resulting in injury. However, it is assumed that the chairs of Patent Documents 1 and 2 are mainly used by adults in the office, and it is possible for the user to lock with the finger inserted between the intermediate bracket and the base. Absent.

  Moreover, there is no risk that a person who is not a user will bother to insert a finger between the intermediate bracket and the base. Furthermore, there may be cases where adults use it in an environment where there are infants due to the spread of telecommuting and the penetration of home offices, but when the infant is nearby, the chair user is careful, so in reality There is no danger. Therefore, it can be said that safety is clear when used by adults.

  By the way, there is a possibility that the infant recognizes the chair as a kind of toy, and without being aware of the danger, take actions such as unconsciously touching around the chair with fingers or inserting a finger if there is a gap It cannot be said that there is no (it is very unlikely). In this case, there is no problem because the chair user is an adult, so there is no problem, but if the chair user is a child or a student, the infant (for example, brother or sister) is not careful, It cannot be said that there is no possibility of rocking while the infant is touching the chair.

  Whether an infant touches the chair as a toy, a user rocks while the infant is touching the chair, or rocking can lead to injury of the infant. It is unknown whether or not, but it can be said that it is the furniture manufacturer's responsibility to eliminate the foreseeable danger as much as possible.

  The present invention is based on such recognition, and an object of the present invention is to provide a chair in which a higher grade of safety is ensured than a normal acceptance standard.

  The chair of the present invention includes, as main elements, a base fixed to an upper end of a leg post, a seat disposed above the base, and a backrest disposed behind the seat, and The front part is connected so that the intermediate fitting to which the seat is attached can tilt at least rearward, and a tilting frame provided with the backrest is provided at a part of the base behind the connection part of the intermediate fitting. The seat is tilted backward at least in conjunction with the backward movement of the backrest by connecting the intermediate metal fitting and the tilting frame so as to be capable of rotating relative to each other. This is the basic configuration.

  And in invention of Claim 1, in said basic structure, the said intermediate | middle metal fitting is provided with a pair of front-and-back longitudinal side parts arrange | positioned on the right-and-left outer side or upper direction of the base, The part is connected to the base so that it can be tilted backwards and retracted, and the rear part of the side part is connected to the tilting frame so as to be relatively rotatable. Further, the side part of the intermediate fitting is connected to the side part and the base. An intermediate cover that prevents a person from inserting a finger is installed between the two.

  According to a second aspect of the present invention, in the first aspect, a seat is attached to the intermediate fitting so as to be adjustable in the front-rear position, while at least the left and right side surfaces of the base are covered with a base cover. The distance between the inner surface of the base cover and the outer surface of the base cover is set to a narrow distance where a human finger cannot be inserted.

  In the present invention, since the intermediate bracket is provided with the intermediate cover, even if an infant or the like tries to insert a finger between the intermediate bracket and the base, the finger is guarded by the intermediate cover and between the intermediate bracket and the base. For this reason, even if a situation occurs in which the user rocks while the infant is still touching the chair, there will be no accident in which the finger is injured.

  As described above, the synchro-type chair in the present invention can ensure a safety level higher than a normal standard. Therefore, the chair according to the present invention is used by children / students (or elderly people) at home. It is suitable as a chair to do. In other words, according to the present invention, the child guard function can be enhanced in an environment where the chair is used, and as a result, the synchro-type chair can be spread as a chair used by children and students at home. I can say that.

  Next, an embodiment of the present invention will be described with reference to the drawings. The present embodiment is applied to a chair used by a child / student as a set with a learning desk, but of course, it can also be used for an adult chair such as an office chair.

(1). Outline of Chair First, an outline will be described with reference to FIGS. FIG. 1 is a perspective view of a chair as viewed from the front, FIG. 2A is a front view, FIG. 3B is a side view, FIG. 3 is a longitudinal side view, and FIG. FIG. 5 is a perspective view of the tilting frame and the back frame.

  The chair includes, as main elements, a leg 1 with casters, a base 2 fixed to the upper end of the leg 1, a seat 3 disposed above the base 2, and a backrest 4 disposed behind and above the seat 3. The armrest device 5 is provided as an optional product (the armrest device 5 is not shown in FIG. 2B). The leg 1 is provided with a leg column (gas cylinder) 6 that is freely extendable and rotatable, and a base 2 is fixed to the upper end of the leg column 6.

  Further, the leg 1 includes five branch legs 7 extending radially, and a step plate 8 having an arc shape in plan view is fixed to three adjacent branch legs 7. Needless to say, the step board is for putting a foot on when the child does not reach the floor with the desk properly used. On the outside of the base 2, there are a handle 9 for adjusting the elasticity of the locking spring, a lifting lever 10 for releasing the lock of the leg column 6 when adjusting the height of the seat 3, and a lock for adjusting the front and rear position of the seat 3. The front / rear lever 11 for releasing is exposed.

  As shown in FIGS. 3 and 4, the seat 3 includes a resin seat inner shell (seat plate) 12 and a seat cushion 13 stretched on the upper surface thereof, and the seat cushion 13 is covered with a cloth. .

  A large number of slits 14 are formed in the seat inner shell 12 in order to be deformed so as to sink downward and to improve cushioning properties. The slit 14 is mainly formed in the rear half of the seat inner shell 12. The seat inner shell 12 is fixed to a seat outer shell (seat receiving member) 15 disposed below the seat inner shell 12 with screws 16. The seat outer shell 15 functions as a strength member that supports the seat inner shell 12, and is supported by a metal intermediate metal member 17 disposed below the seat inner shell 12 so that the front and rear positions can be adjusted (details will be described later).

  The backrest 4 includes a rectangular metal back frame 18 shown in FIG. 5, and a back inner shell 19 (see FIG. 1) is attached to the front surface of the back frame 18. A back cushion 20 is stretched on the front surface. The back cushion 20 and the back inner shell 19 are completely covered with a bag-like cloth 21. The back frame 18 is covered from the back side with a back cover 22 (see FIG. 2B) having a shape similar to the back frame 18 (square shape).

  The rear ends of the left and right tilt frames 23 extending substantially in the front-rear direction on the left and right outer sides of the base 2 are fixed to the lower end of the back frame 18 by welding. The tilt frame 23 is connected to the base 2 so as to freely tilt backward, and the armrest device 5 described above is fixed to the tilt frame 23.

(2) Details of the member / locking mechanism / synchronizing mechanism The backrest 4 tilts backward (locks), and the seat 3 tilts backward while moving backward (synchronized) in conjunction with the backward tilting of the backrest 4. Next, details of the locking mechanism, the seat synchronization mechanism, and the peripheral members will be described with reference to FIGS. 6 to 9 in addition to the previous drawings.

  6A is a perspective view of the support mechanism section centered on the base 2 as viewed from above, FIG. 7B is a perspective view of the support mechanism section as viewed from below, and FIG. 8A is a perspective view of the seat outer shell 15 turned upside down and viewed from the back, and FIG. 8B is a cross-sectional view of the intermediate bracket 17 separated from BB. FIG. 9C is a perspective view of the intermediate cover, and FIG. 9 is an exploded perspective view mainly showing the relationship between the base 2 and the back frame 18.

  In the present embodiment, the front portion of the intermediate bracket 17 is connected to the front portion of the base 2 by the first shaft 25 so as to be tiltable rearward and retractable, and the tilting frame 21 is tilted rearward by the second shaft 26 to the rear portion of the base 2. Further, the rear portion of the intermediate metal member 17 is connected to the front and rear middle portion of the tilting frame 21 so as to be rotatable by the third shaft 27, and the backrest 4 is locked (rearly tilted) by these kinds of link mechanisms. In addition, the seat 3 is tilted backward while being retracted in conjunction with the backward tilting of the backrest 4, and the locking of the backrest 4 and the synchronization of the seat 3 are mainly elastically supported by the locking spring 28. Has been. This will be described below.

  For example, as clearly shown in FIGS. 7 and 9, the base 2 is formed in a box shape having an upward opening with left and right side plates 2 a, and an inner bracket 29 to which the leg support 5 is fitted is fixed to the rear part. Yes.

  The intermediate bracket 17 includes left and right side frames 31 ', 31 "extending in parallel in the longitudinal direction, and a first shaft 25 made of a round pipe is welded to the front of the left and right side frames 31', 31". The third shaft 27 made of a round pipe is fixed to the rear portion by welding. The side frames 31 ′ and 31 ″ have an inverted L-shaped cross section having an upper flange 31a. The seat outer shell 15 is slidably fitted to the upper flange 31a by the following means.

  First, the side frames 31 ′ and 31 ″ will be described. In the middle of the front and rear of the flange 31 a in the left and right side frames 31 ′ and 31 ″, a flange portion 32 extending in the front and rear direction is formed. On the other hand, as shown in FIGS. 8A and 8B, on the lower surface of the seat outer shell 15, the left and right inner guide ribs 33 positioned on the inner side surfaces of the side frames 31 ′ and 31 ″ and the side frames 31 ′ and 31 are provided. A group of right and left outer guide pieces 34 and 35 holding the upper flange 31a is formed. The outer guide pieces 34 and 35 are formed by a so-called extraction method in injection molding, and the seat outer shell 15 is attached to the side frame 31 so as to move back and forth by a group of the outer guide pieces 34 and 35.

  In this case, there is a certain distance between the group of outer guide pieces 34 located on the near side and the group of outer guide pieces 35 located on the far side. The front / rear length dimension L1 of the entire group of outer guide pieces 35 located on the back side is slightly smaller than the front / rear length dimension L2 of the bent portion 32 of the side frames 31 ', 31' ', and the front / rear outer dimension The distance L3 between the guide pieces 34 and 35 is larger than the length L4 of the upper flange 31a of the side frames 31 ′ and 31 ″ in front of the turn part 32.

  Due to the dimensional relationship of L1 to L4, the group of the outer guide pieces 35 on the back side of the seat outer shell 15 is fitted into the turn portion 32 of the side frame 31 from above, and then the entire seat outer shell 15 is slid to the back side. The seat outer shell 15 can be attached to the side frames 31 ′ and 31 ″ according to the procedure.

  As shown in FIG. 7, the upper flange 31a of the left side frame 31 'is formed with a plurality of cutout engagement grooves 36 for front-rear position adjustment, while the seat outer shell 15 is formed with the engagement grooves 36. A front / rear lever 11 having a claw portion to be engaged and disengaged is attached. When the front / rear lever 11 is fitted in the engagement groove 36, the seat outer shell 15 is held so as not to be detached from the side frames 31 'and 31' '.

  As shown in FIG. 7, an auxiliary notch 37 is formed in a portion of the upper flange 31a of the left side frame 31 'in front of the group of engaging grooves 36, and a part of the front and rear lever 11 is notched. It is located at 37 points. In other words, the auxiliary notch 37 is formed in the left side frame 31 ′ in order to avoid buffering with the front and rear levers 11.

  For example, as can be understood from FIG. 7, a forward opening groove 39 for supporting the first shaft 25 is formed in the front portion of the left and right side plates 2 a in the base 2. The first shaft 25 is fitted with left and right front bushes 40 that enter the forward opening groove 39 of the base 2 and a front spring receiver 41 sandwiched between the left and right front bushes 40. The left and right front bushes 40 are fixed to the base 2 with screws.

  A stopper member 42 for preventing lateral deviation is fixed to the left and right intermediate portion of the first shaft 25. The left and right front bushes 40 are made of synthetic resin and are formed in a U shape when viewed from the side, and the first shaft 25 is slidably fitted back and forth in the space. The front spring receiver 41 is formed in a U shape in a side view of the rearward opening so that the first shaft 25 is fitted.

  Inside the base 2, a spring receiving slider 43 is disposed so as to be slidable left and right on the front wall surface of the inner bracket 29, and the rear spring receiving 44 is fitted into the spring receiving slider 43. The locking spring 28 is sandwiched between the front and rear spring receivers 41 and 44. When the handle 9 is rotated, the spring receiving slider 43 moves left and right, and then the rear spring receiving 44 moves back and forth due to the wedge action. As a result, the initial elastic force of the locking spring 28 changes.

  The tilting frame 21 uses a metal pipe (steel pipe) having an oval cross section, and is arranged on the left and right outer sides of the base 2 as described above. A second shaft 26 made of a round pipe is fixed to the front end portion of the left / right tilt frame 21. As can be easily understood from FIG. 9, the first shaft 25 is sandwiched from above and below by an upper center bush 45 and a lower center bush 46, and the upper and lower center bushes 45, 46 are bases via a center metal fitting 47. 2 is fixed to the lower surface. The upper center bush 45 is fitted to the base 2 so as not to move left and right.

  As shown in FIG. 3 (B), the third shaft 27 has a metal plate bridge member 48 arranged so as to be bridged over the left and right tilt frame 21, a split synthetic resin rear bush 49 and a pressing rear. They are connected by a metal fitting 50. The bridge member 40 is fixed to the back frame 18 by welding.

  Between the rear end of the base 2 and the lower end of the back frame 18, a back gas cylinder 51 that can hold the backrest 4 at an arbitrary rearward tilt angle is disposed (the gas cylinder 51 is used for locking and synchronizing the seat 3). It also has an elastic support function.) The back gas cylinder 51 is connected to the base 2 and the back frame 18 so as to be relatively rotatable. For this reason, as shown in FIG. 5, for example, a connecting projection 52 is provided on the left and right middle portion of the lower portion of the back frame 18, and a bracket 53 is fixed to the rear portion of the left tilting frame 21. The bracket 53 is provided with a lever (not shown) that switches the back gas cylinder 51 between a locked state and a free state.

  As described above, when a seated person leans on the backrest 4, the backrest 4 tilts backward about the second shaft 26 against the elasticity of the locking spring 28 and the back gas cylinder 51, while the seat 3 Is moved backward while being tilted by the pulling action of the third shaft 27 and the sliding of the first shaft 25. Needless to say, the degree of backward inclination of the seat 3 is much smaller than the degree of backward inclination of the backrest 4. The back tilt angle of the backrest 4 and the seat 3 is regulated by the bridge member 48 hitting the stopper member 2 c provided at the rear portion of the base 2. The stopper material 2c is made of a soft material such as hard rubber.

  As clearly shown in FIG. 3 (A), the base 2 is inclined in a side view so that the front portion thereof is higher. On the other hand, as shown in FIG. 3 (A), FIG. 4 and FIG. 8 (A), the seat outer shell 15 is basically a shallow dish that opens upward, and the seat inner shell is formed on the left and right sides thereof. By fixing 12, the seat inner shell 12 is allowed to extend and deform downward (bending) with human body pressure, thereby ensuring cushioning and fit.

  In this case, the seat inner shell 12 only needs to be greatly sunk and deformed around the portion where the seated person's buttocks abut, and the front half of the seat inner shell 12 need not substantially sink and deform (in the first half of the seat inner shell 12 Because it does not take much load, there is no tension against the thigh even if it does not sink and deform.)

  Therefore, as can be easily understood from FIGS. 3 (A) and 4, an upward concave portion that is wider than the base 2 and protrudes toward the seat inner shell 12 in the front half portion and the left and right middle portions of the seat outer shell 15. The space between the front portion of the base 2 and the seat outer shell 15 is made as small as possible (the seat 2 can be lowered as much as possible for users with low height). Therefore, the distance between the base 2 and the seat outer shell 15 is preferably as small as possible.)

  As shown in FIGS. 2 and 3A, the base 2 is almost entirely covered with a base cover 54. The base cover 52 is divided into upper and lower parts and is attached to the base 2 so that it does not interfere with the first shaft 25, the second shaft 26, and the levers 9 and 10.

(3). Intermediate cover As shown in FIGS. 2, 6, and 7 and the like, intermediate covers 55 and 56 are attached to the side frame 31 of the intermediate fitting 17 from the outside. This point will be described with reference to FIGS. 10 and 11 in addition to the previous drawings. 10 is a side view showing the positional relationship between the base cover 54 and the intermediate covers 55 and 56, and FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. Dotted parallel diagonal lines are not for displaying cross sections but for showing the form.)

  As clearly shown in FIG. 11, the intermediate covers 55 and 56 cover portions of the side frames 31 ′ and 31 ″ excluding the upper flange portion 31 a from the outside, and have an outer plate and a peripheral wall 57. It has a container-like shape opened toward the side frames 31 ′ and 31 ″. In addition, a front boss body 58 that elastically fits to the first shaft 25 and a rear boss body 59 that elastically fits to the third shaft 27 are provided inside, and these front and rear boss bodies 58 and 59 are provided. Thus, the side frames 31 ′ and 31 ″ are detachable.

  Further, as shown in FIGS. 7, 8C, 11 and the like, ribs 60 are provided inside the intermediate covers 55 and 56 so as to overlap the vertical portions of the side frames 31 ′ and 31 ″. The lower part protrudes inwardly. Therefore, the lower part of the intermediate covers 55 and 56 protrudes inside the side frames 31 ′ and 31 ″. In other words, the intermediate covers 54 and 55 have a lower width on the bottom surface that is larger than a width on the upper surface. This is because the gap between the intermediate covers 55 and 56 and the base cover 52 is made as small as possible because there is a certain amount of left-right spacing between the base 2 and the side frames 31 ′ and 31 ″.

  Further, although the upper surface of the right intermediate cover 55 is flat over the entire length, a two-stepped step portion for avoiding interference with the front and rear levers 11 is provided at the front portion of the upper surface of the left intermediate cover 54. 61 is formed.

  The vertical pieces of the side frames 31 ′ and 31 ″ constituting the intermediate metal fitting 17 are generally shaped such that the front and rear portions are scooped in a side view so that the mounting portions of the shafts 25 and 27 protrude downward. On the other hand, the side view form of the intermediate covers 55 and 56 is also substantially the same as the side view form of the side frames 31 ′ and 31 ″, and is formed such that the front and rear intermediate parts are opened downward in the side view. (The right intermediate cover 56 is bent so as to open downward, so that interference with the lifting lever 10 is avoided).

  As shown in FIG. 10, the intermediate covers 55 and 56 and the base cover 54 overlap with each other so that no gap is generated between them, and as shown in FIG. The space S between the cover 56 and the base cover 52 is very small. Therefore, even an infant cannot insert a finger into the space S between the two. Thus, the chair of this embodiment has an extremely high child guard function.

  As a method of attaching the intermediate covers 55 and 56 to the side frames 31 'and 31 ", for example, an engagement hole is formed in the side frames 31' and 31" and a boss provided on the intermediate covers 54 and 55 is elastically fitted thereto. However, if the boss bodies 58 and 59 are fitted to the first shaft 25 and the third shaft 27 made of pipes as in this embodiment, the side frames 31 ′ and 31 ″ are used. Since no special processing is required, there is an advantage that the cost can be avoided, and it is also possible to hold the shafts 25 and 27 from the outside with a cylindrical boss body.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, the intermediate metal fitting may be formed in a downward opening U-shape in which downward side plates are formed on the left and right sides of the upper plate. Moreover, this invention is applicable also to what is supporting the seat by the right-and-left both sides of an intermediate metal fitting like patent document 1. FIG. Further, in the present invention, the seat may be fixed to the intermediate fitting so that the front / rear position cannot be adjusted.

  Further, although the name of the “metal fitting” is given to the intermediate metal fitting, the material is not necessarily made of metal, and may be made of resin. In some cases, the base may not have a base cover. In this case, the intermediate cover may be brought close to the side surface of the base. The present invention can also be applied to a chair whose seat only tilts backward in conjunction with rocking.

It is the perspective view which looked at the chair concerning an embodiment from the front. (A) is a front view and (B) is a side view. It is a vertical side view. It is the isolation | separation perspective view centering on the seat. It is a perspective view of a tilting frame and a back frame. (A) is the perspective view which looked at the mechanism part centering on the base 2 from upper direction, (B) is the perspective view which looked at the mechanism part from the downward direction. It is a separation perspective view mainly showing the relation between an intermediate metal fitting and a base. (A) is a perspective view of the seat outer shell turned over and viewed from behind, (B) is a sectional view taken along the line BB of (A), with the intermediate bracket separated and displayed, and (C) is a perspective view of the intermediate cover. is there. It is a separation perspective view mainly showing the relation between a base and a back frame. It is a side view which shows the positional relationship of a base cover and an intermediate | middle cover. FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 10 in a state where other members are also displayed.

Explanation of symbols

1 leg device 2 base 3 seat 4 backrest 15 seat outer shell 17 intermediate bracket 25, 26, 27 shaft 31 ', 31 "side frame 54 base cover 55, 56 intermediate cover 58, 59 boss body

Claims (2)

An intermediate bracket having a base fixed to the upper end of the leg post, a seat disposed above the base, and a backrest disposed at the rear of the seat, with the seat attached to the front portion of the base Are connected so as to be able to tilt at least rearwardly, and a tilting frame provided with the backrest is connected to a portion of the base behind the connecting portion of the intermediate bracket so as to be tiltable rearwardly. By connecting the tilting frame and the tilting frame so that they can rotate relative to each other, the seat tilts backward at least in conjunction with the backward movement of the backrest.
A chair called
The intermediate bracket includes a pair of longitudinal front and rear side portions arranged on the left and right outer sides or the upper side of the base, and the left and right side portions are connected to the base so that they can be tilted backward and retracted. And the rear part of the side part is connected to the tilting frame so as to be relatively rotatable, and an intermediate cover for preventing a person from inserting a finger between the side part and the base is provided on the side part of the intermediate fitting. Installed,
Rocking chair. While the seat is attached to the intermediate bracket so that the front-rear position can be adjusted,
At least the left and right side surfaces of the base are covered with a base cover, and the interval between the inner surface of the intermediate cover and the outer surface of the base cover is set to a narrow interval where a human finger cannot be inserted,
The rocking chair according to claim 1.

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