JP5795142B2 - Rocking chair - Google Patents

Description

The present invention is inclined backward while sinking is lean back, and at the same time the seat is related to locking a chair to move forward.

As a type of rocking chair in which the backrest tilts backward, the base of the back strut that supports the back of the backrest is movably connected to the seat support that is supported by the legs, and between the seat support and the back support linked at the same time the seat when the backrest is tilted backward while sink against the spring force include the structure to move forward, the other of Patent Document 1 and 2, it is disclosed in a number.

As another type, for example, in Patent Document 3, an intermediate fitting having a seat cushion on the upper surface is arranged on the seat receiving portion (chassis) so as to be movable back and forth, and a base portion of an L-shaped guide track is seen on the intermediate fitting in a side view. On the other hand, the base of an L-shaped back support (back support) is fixed to the rear end of the seat receiving part in a side view, and this back support is arranged behind the chair rather than the guide track. .
And the up-and-down slide part provided in the back surface of the backrest with respect to the horizontal pin of the upper end of a back support | pillar is mounted | worn so that a vertical movement is possible. Further, the rollers on both sides of the lower horizontal pin attached to the lower side of the bracket extending downward on the back of the guide track with the backrest are transferred to the guide groove extending in the vertical direction provided on the guide track below the vertical slide portion. A configuration that is movably fitted is disclosed (see FIG. 5). According to this configuration, when a seated person leans on the backrest, the backrest is lowered while being tilted backward, and the seat moves forward as a whole.

JP 2000-236977 A Japanese Patent No. 3160826 US Patent Application Publication: US2009 / 0152921A1

However, in the configuration of Patent Document 1 or 2, members for coupling the Zajo gold tool for moving back and forth relative to the support to the seat receiving portion supporting rod Toka seat cushion of the backrest comprises a plurality of link members, structure Therefore, there is a problem that the number of necessary parts and the mounting process increase, resulting in an increase in cost.
On the other hand, the configuration of Patent Document 3 also has a problem that the backrest is lowered while being tilted backward and the connecting configuration for moving the seat forward is complicated. Furthermore, in the configuration of Patent Document 3, when the guide track with a backrest sinks downward, the movement of the lower end of the guide track to the front with respect to the seat receiving portion is increased and smoothed. 10 and fig. As shown in FIG. 11, a roller is rotatably provided at the lower end of the guide track, and this roller must be slidably fitted into a longitudinal guide groove formed on the side surface of the seat receiving portion. There was a problem that the configuration was complicated.

  The present invention has been made to solve such problems of the prior art.

The invention of claim 1 of the present application is a rocking chair in which the backrest leans backward while the backrest sinks and the seat moves forward with respect to the back column body fixed to the seat receiving portion of the upward opening supported by the legs. And
The backrest is attached to the upper portion of the back strut body by fitting the vertical guide groove provided in either one of the backrest or the back strut body and the left and right lateral pin provided in the other. While being connected to be movable up and down and having a base portion extending forward toward the lower side of the seat,
The seat receiving portion is provided with elongated holes on the left and right sides in the front-rear direction of the chair, and a seat bracket that supports the seat is slidable in the front-rear direction and mounted in a non-rotatable side view.
By connecting a pair of left and right downward mounting portions provided on the seat bracket and a bearing portion provided on the base of the backrest with one connecting shaft inserted through the left and right elongated holes, the seat is It is allowed to tilt backward while moving back and the backrest sinking,
In addition, a locking spring supported from behind by a spring support piece projecting downward on the seat bracket before the connecting shaft extends and contracts without changing the side view posture while hidden inside the seat receiving portion. Are arranged to be.

According to the present invention, by tilted backward while sinking backrest, seat simultaneously moves forward, in the locking state, since a small tilt movement amount after the top of the backrest relative to the reclining angle of the backrest, the seating Since the person does not greatly warp backward, and the seat moves forward at the same time, the body does not move greatly away from the desk at the time of locking when performing desktop work such as operating a personal computer. You can continue working while picking.

In addition, since the seat bracket and the back side member are connected by a single connecting shaft, the number of parts for connecting the seat bracket and the back side member is reduced, Since the assembly process of the chair is also reduced, the cost can be reduced.

Furthermore , there is an effect that the connection work between the seat receiving portion, the backrest and the seat bracket is extremely simple.

Furthermore, the locking spring can be mounted in the seat receiving portion at a stage before the seat bracket is mounted on the seat receiving portion so as to be movable back and forth.

It is a front side perspective view of the whole rocking chair concerning a 1st embodiment. (A) is a vertical side view in a normal state, and (B) is a vertical side view in a rocking (backward tilt) state. It is a perspective view of the back side. It is a perspective view of the back side in the state where the back support cover body was removed. It is the perspective view which isolate | separated the back cushion, the back outer shell, the back inner shell, and the back support cover body. It is a perspective view which shows the inner surface side of a back support cover body. It is a side view which shows the structure in the seat base which shows a seat base with a dashed-two dotted line. It is a lower surface side perspective view which shows the duplication part of a back outer shell and a seat outer shell. It is a lower surface side perspective view of the state where the seat outer shell was removed. FIG. 9 is a top perspective view of FIG. It is a lower surface side perspective view of a seat inner shell. It is an upper surface side perspective view in the state where the seat inner shell was separated from the seat outer shell. It is a perspective view which shows a back outer shell, a back support | pillar body, and a slide guide member. (A) is explanatory drawing of the operation | work which mounts a slide guide member (back outer shell) to a back support | pillar body, (B) is explanatory drawings, such as the inclination angle of the slide guide member (back outer shell) in that case. It is a perspective view in the state where a seat bracket etc. was removed from a seat receiving part. It is a lower surface side perspective view in the state where a base part of a back outer shell, a seat metal fitting, etc. were attached to a seat receiving part. XVII-XVII sectional view of FIG. It is a partially notched upper side perspective view which shows the connection part with respect to seat receiving parts, such as a back outer shell and a back support | pillar body. It is the XIX-XIX sectional view taken on the line of FIG. It is a front side perspective view which shows a back outer shell, a seat receiving part, a back support | pillar body, etc. It is XXI-XXI arrow expanded sectional view of FIG.

Next, an embodiment of the present invention will be described with reference to the drawings . Contact name but uses wording such as "front-rear", "front", "rear", "left" to indicate the direction in the following description, these words are rocking chair (hereinafter, simply referred to as a chair) of the person seated in the Based on posture. “Front view” is a state viewed from the direction facing the seated person.

<Overview>
FIG. 1 is a front side perspective view of the entire chair. First, an outline will be described. This embodiment is applied to a so-called swivel chair for office use, and the chair includes, as main elements, a leg device 1 (corresponding to a leg in the claims), a seat receiving portion 2, a seat 3, a backrest 4, and a back column. It has a body 5 and an armrest device 7.

A leg column 6 made of a gas cylinder constitutes a part of a leg device 1 having a conventionally known configuration. The leg column 6 is a leg body having a plurality of (generally five) branch legs extending radially. It is fitted in the center. Armrest apparatus 7 is optional component, the proximal end on the left and right sides of the seat base 9 (described in detail later) is detachably mounted, are erected on right and left sides of the seat 3. Since the armrest device 7 is not a main part of the present invention, a detailed description is omitted. In the state where the armrest device 7 is removed, the armrest mounting portions 9d on the left and right sides of the seat base 9 are covered with a removable resin cover 8 (see FIGS. 7 and 8). In Figure 7, the seat outer shell 11, the seat outer shell 14 and the back pillar cover member 18 is abbreviated saving.

Seat receiving unit 2 is provided with an upward opening Hokatami shaped seat base 9 fixed to the upper end of the leg support post 6. On the other hand, the seat bracket 10 to which the seat 3 is attached is slidably attached to the upper end of the seat base 9 (see FIGS. 2, 7, 13, 20, etc.).

Seat 3 includes a seat outer shell 11 attached to the upper surface of the seat on the bracket 10, a seat inner shell 12 attached to the upper surface of the seat outer shell 11, a seat cushion body 13 mounted on the upper surface of the seat inner shell 12 are Bei Ete (2, 7, see FIG. 12 etc.). Seat outer shell 11 and the seat inner shell 12, POM, but is an injection molded article with the material of the synthetic resin material such as PP, it may be a metal or wood.

The backrest 4 includes a back outer shell 14, a back inner shell 15 attached to the front surface of the back outer shell 14, and a back cushion body 16 attached to the front surface of the back inner shell 15 (FIGS. 2 and 3). (See FIGS. 8, 12, and 13). The back outer shell 14 and the back inner shell 15 are injection molded products made of a synthetic resin material such as POM or PP. The back outer shell 14 as an example of the back side member is formed in an L shape in a side view, and a main body portion 14a that supports the back inner shell 15, and a front direction from the lower end of the main body portion 14a toward the lower side of the seat 3 And a base portion 14b extending to the bottom.

In the embodiment, the back strut body 5 includes a back strut 17 having a pair of left and right pipe members 17 a formed in an L shape in side view, and a detachable back strut cover body 18 that covers the back side of the back strut 17. It has. As another example, the back support 17 and the back pillar cover 18 constituting the back support column 5 may be a form that is integrally formed for example by a resin material or aluminum shaped articles.

The base of the pair of pipe members 17a in the back support column 5 is fixed by welding to the base substrate 19 that is fixed to the inner surface of the metallic seat base 9, further welded to the base substrate 19 is covered with a metal fitting 20 Etc. (see FIGS. 13 and 18). In addition to this, it may be screwed.

The seat base 9 has a box shape with an upward opening, and a metal base substrate 19 is fixed to the inner surface of the rear portion thereof by welding. The rear end of the seat base 9 is open. The seat base 9 and the bush 21 which is fixed to the base substrate 19, and fitting the upper end of the leg support post 6. An elevating lever 22 for operating the push valve of the leg support 6 (gas spring) and an operation lever 23 for switching the backrest 4 between a locking operation disabled state and a locking operation enabled state protrude from the left and right sides of the seat base 9. Provided (see FIGS. 3, 13, 15 to 17, etc.).

  The left and right side plates 9 a of the seat base 9 have long holes 24 that are long in the front-rear direction, and resin bushes 24 a are mounted in the long holes 24. The connecting shaft 25 is arranged so as to penetrate the inner diameter long holes of the left and right bushes 24a to the left and right and to be slidable in the front-rear direction (see FIGS. 2, 7, 13, 15, etc.). ).

For example, as can be understood from FIGS. 2, 8, and 9 , a flat plate-like metal fitting 10 is at least screwed to the lower surface of the seat outer shell 11 , and a mounting portion 26 projecting downward on the left and right sides of the rear end portion. The connecting shaft 25 penetrates. As can be understood from FIGS. 13, 15, and 19, a rear spring receiving body 31 a that is fitted to a rear end of a locking spring 30 described later is provided at the rear end portion of the seat bracket 10 and at an intermediate position in the left-right direction. the spring supporting pieces 29 for supporting the can, that is extended downward. Then, as shown in FIG. 21, a horizontal piece 9b facing left and right outward is integrally provided at the upper ends of the left and right side plates 9a of the seat base 9, and a holding portion having a U-shaped cross section is formed on the horizontal piece 9b. A resin slider member 28 is externally fitted and fixed so as not to move back and forth. The slider holding portions 27 having a U-shaped cross section on both the left and right sides of the seat bracket 10 are configured to fit over the slider member 28 so that the seat bracket 10 can slide back and forth with respect to the seat base 9.

On the outside of the left and right side plates 9a in the seat base 9, a pair of left and right bearings 32 as mounting portions provided at the front end of the base 14b at the lower end of the back outer shell 14, and a pair of left and right mounting portions in the seat bracket 10 26 , the connecting shaft 25 passes therethrough . The mounting portion 26 is disposed at a position spaced from the outside of the left and right side plates 9a, and the bearing portion 32 is disposed close to the outside (see FIGS. 9, 16, 17, and 16). In FIG. 13 and FIG. 15, in order to show the state of the connecting shaft 25, the seat bracket 10 is illustrated with respect to the connecting shaft 25. The mounting operation of the connecting shaft 25 will be described in detail later.

As a result, when the backrest 4 tilts backward during the locking operation, the seat bracket 10 moves forward. These loads are elastically supported by the rocking spring 30.

In addition, the seat outer shell 11 engaged and connected to the lower surface side of the seat inner shell 12 is formed with a mounting opening portion 11a opened rearward. Therefore, the seat outer shell 11 by inserting from the front of the seat base 9, both when the lower upper-side portion and the seat on the fitting 10 of the outer right and left side plates 9a of the seat base 9 is divided covered, the long hole 24 and the bush 24a is also covered from the outside (see FIG. 8).
Further, a substantially semicircular arc shaped shaft front cover 33 formed integrally with the rear end portion of the seat outer shell 11 and a bearing portion 32 formed integrally with the front end of the base portion 14 b at the lower end of the back outer shell 14. a shaft portion rear cover of the substantially semicircular is, by overlapping part at the lower side, the lower part of such connecting shaft 25 and the inner and outer bushes 52, 53 are covered. The presence of the outer plate 33a in the shaft front cover 33 prevents the connecting shaft 25 from coming out in the axial direction (see FIGS. 8 and 9).

Further, the shaft portion front cover 33 and the rear shaft cover portion because it is formed on (the bearing portion 32) Togaryaku semicircular, the傾時after backrest 4, the shaft portion front cover 33 and the shaft portion rear cover (Bearing portion 32) does not interfere with each other and can be rotated in a partially overlapping state. Furthermore, a stepped portion 34 is formed at the rear end of the seat outer shell 11 so as to overlap with the front end edge of the base portion 14b at the lower end of the back outer shell 14 by an appropriate size from above (see FIG. 12).

A lock arm 34 is attached to a base receiver 36 fixed in the seat base 9 so as to be rotatable in the vertical direction. On the free end side of the lock arm 34, a long hole 35 into which the distal end crank portion 23a of the operation lever 23 is fitted is formed (see FIG. 7). The operating lever 23 in the pivoted at distal crank portion 23a pushes up the locking arm 34 through a long hole 35, increasing the free end of the locking arm 34, formed recess on the upper surface of the lock arm 34 The connecting shaft 25 is fitted into the stopper engaging portion 34a (see FIG. 7), and the connecting shaft 25 is prevented from moving forward. As a result, the forward movement of the seat bracket 10 and thus the seat 3 can be prevented, and the backward tilting of the backrest 4 is prevented, and the locking operation is disabled.
As shown in FIG. 7, when the lock arm 34 is in the down position, the stopper engaging portion 34 a is disengaged from the connecting shaft 25 and allows the connecting shaft 25 to move forward. Thereby, the forward movement of the seat bracket 10 and by extension, the seat 3 can be allowed, and the backward tilting while the backrest 4 is depressed is allowed, so that the rocking operation is possible. In this way, the forward movement of the seat 3 can be prevented by simply pushing up the lock arm 34 and the locking operation cannot be performed. Since it is substantially parallel to the direction of expansion and contraction, the rigidity of the lock arm 34 can be made smaller and smaller than that which can withstand shearing.

Next, a connection structure between the back outer shell 14 as an example of the back side member and the back column body 5 will be described. In the present embodiment , as will be described later, the opening 40 is formed in a vertically long view in the rear view, and the back support body 5 has an opening in both the normal state (non-locking state) and the locking state of the backrest 4. 40 is blocked. Further, when the back outer shell 14 is attached to the back strut body 5, at least the upper side of the back strut body 5 (particularly the back strut cover body 18) can pass through the opening 40 to the inner surface side of the back outer shell 14. It is formed (see FIGS. 3 to 5, 12, 13, 18, and 20).

For example, as shown in FIG. 5 , the opening 40 is formed so as to continuously extend from the front end of the base portion 14 b on the left and right center side of the back outer shell 14 to the midway height position of the main body portion 14 a. However, the middle part in the front-rear direction of the base part 14 b and the middle part in the vertical direction of the main body part 14 a are integrally connected by a plurality of connecting members 41 so as to straddle the opening 40 on the inner surface side of the back outer shell 14. (See also FIGS. 12, 13, 18, and 20). This prevents the left and right members of the back outer shell 14 separated by the opening 40 from being inadvertently deformed. A large number of grid-like reinforcing ribs 42 are integrally formed on the outer periphery of the opening 40 and on the inner surface of the back outer shell 14 in order to improve its rigidity.

For example, as shown in FIG. 5, left and right laterally long lateral pins 43 for connection to the back outer shell 14 are fixed to the upper end portion of the back strut 17 in the back strut body 5, and both left and right end portions of the lateral pin 43 are outside. Is exposed. On the other hand, in the opening 40 in the back outer shell 14, a pair of upper and lower longitudinal mounting grooves 44 are formed at positions facing each other along the left and right side edges extending vertically on the main body 14a side. A guide member 45 having a slide groove (guide groove) 45a formed in a recess is fitted in each mounting groove 44 (see FIGS. 7 and 13) . In the embodiment, as shown in the figure, the sliding groove 45a is vertically long and is formed in a gentle arc shape. The center of this arc is located on the back cushion body 16 side (the front side of the chair).

The guide member 45 may be made of a high-functional resin that has low sliding resistance with both ends of the metal lateral pin 43 and has wear resistance, and the sliding portion with the lateral pin 43 is coated with fluorine. The metal member which gave can also be used. When the back outer shell 14 is mounted on the back column 17, a configuration in which the guide member 45 can be fixed to the inner surface of the back outer shell 14 may be employed. As another example, directly to the back outer shell 14, it may form the shape of the upper and lower longitudinal sliding groove 45a and the upper and lower longitudinal hole, on the contrary, a guide member 45 to the back support column 5 side, The lateral pins 43 may be provided on the back outer shell 14 (back side member). In these cases, you may comprise by a long hole and a link member.

Against the back support 17, the back post cover 18 is detachably attached. As shown in FIG. 8, on the inner surface of the back strut cover body 18, there are a plurality of support ribs 46 in which U-shaped fitting grooves 46a for supporting each of the pair of pipe members 17a are cut out. Is formed. The width dimension of the open end of the U-shaped groove 46a is formed slightly narrower than the diameter of the pipe member 17a, and a retaining claw 47 disposed in the vicinity thereof is provided. Does not fall off easily. Further, notches 48 for avoiding both ends of the lateral pin 43 are formed on the left and right side plates of the back column cover body 18. Further, a housing-like fitting portion 49 opened downward is formed at the upper part of the inner surface of the back column cover body 18, and an engaging claw portion 50 is provided at the lower part of the inner surface of the back column cover body 18. .

Therefore, in order to firmly attach the back strut cover body 18 to the back strut 17, as shown in FIG. 15, the fitting portion 49 is attached to the upper end of the reinforcing bracket 51 that connects the upper ends of the pair of pipe members 17 a from above. On the other hand, the engaging claw portion 50 may be engaged by being pushed into an engaging hole (not shown) formed in the rising piece at the rear end of the base substrate 19. Incidentally, with respect to the back support 17, a back outer shell 14, the opening 40 to the transverse pin 43 of the back support 17 from the front side is moved closer at an oblique posture with respect to the pair of guide members 45 at the opening 40 Then, both ends of the horizontal pin 43 are fitted (details will be described later).

  Note that the order in which the back strut cover body 18 is attached to the back strut 17 first, the back outer shell 14 is attached to the back strut 17, and then the back inner shell 15 is fixed to the back outer shell 14 is preferable. . The back strut cover body 18 may be attached to the back strut 17 later. FIG. 4 shows this state.

  Next, an operation for fitting the pair of guide members 45 in the back outer shell 14 into both ends of the lateral pin 43 in the back column 17 will be described.

When the distance between the pair of guide members 45 is larger than the dimension between both ends of one horizontal pin 43, generally, at least one guide member 45 is placed on the back support member such as the back outer shell 14. Although the structure which can be attached or detached, or the structure which retrofits the horizontal pin 43 with respect to the back support | pillar 17 of the back support | pillar body 5 is employ | adopted, since it requires a fixing means separately that it is removable, there are many components. There was a problem of becoming.

  Therefore, for example, in Japanese Patent No. 4119300, as a configuration for connecting the back of a chair and a back support member that supports the chair, a horizontal shaft provided on the back support member and protruding in the width direction, and a part of the back And a pair of restricting portions provided on the inner surface of the back cover for covering the back side of the back. When the horizontal axis is inserted obliquely inside the pair of standing walls, both ends of the horizontal axis are inserted through the insertion holes, and the back cover is attached to the back of the back, the pair of standing walls are paired inside the pair of standing walls. The structure which inserts a control part and controls the horizontal movement of a back support member by the said control part is disclosed.

However, even with this configuration, there are problems that the number of necessary parts is large, the number of man-hours for connection is large, and it is troublesome, resulting in high manufacturing costs.

On the other hand, in the present embodiment, the pair of guide members 45 mounted on the back outer shell 14 has a longitudinal sliding groove 45a in the vertical direction, and the horizontal lateral pins 43 in the back column body 5 On the other hand, on the premise that the pair of guide members 45 can relatively move up and down, a configuration that can reduce the number of necessary parts and the mounting process is adopted.

  That is, the back outer shell 14 in which a pair of guide members 45 are mounted so as to be opposed to both the left and right sides of the vertically long opening 40 is arranged with respect to the horizontal pins 43 whose left and right side edges in the opening 40 are horizontal. Approach the horizontal pin 43 so as to be inclined. In the embodiment, when the length L1 of the lateral pin 43 is L2 and the distance between the inner sides of the pair of guide members 45 is L2 (<L1), the back outer shell 14 is inclined as shown in FIG. The back outer shell 14 is rotated so that the lateral pin 43 can be inserted between the inside of the pair of guide members 45, and then the lateral pin 43 fits into the sliding groove 45a of the pair of guide members 45 (see FIG. (See solid line state in FIG. 14A). As a result, as shown in FIGS. 9, 10, and 15, the posture of the back outer shell 14 can be returned so that the left and right side edges of the vertically long opening 40 are vertical, and the horizontal horizontal pins The pair of guide members 45 can move up and down relatively with respect to 43.

The length of the line segment OP (= the distance between the insides of the pair of guide members 45) is L2, and the length of the line segment OQ (= the length of the horizontal pin 43) is L1. At that time, as can be understood from FIG. 14B, the angle θ at which the back outer shell 14 is first tilted has a relationship of cos θ = L2 / L1. Therefore, when the length of the Ru distance der relatively shifting for the vertical direction of the one end of the slide groove 45a with respect to the horizontal transverse pin 43 line segments PQ L4, sinθ = L4 / L1. Therefore, as described above, the horizontal pin 43 is inserted between the inner sides of the pair of guide members 45 so that the back outer shell 14 (the left and right side edges of the opening 40) is inclined with respect to the horizontal horizontal pin 43. In order to make this possible, the distance in the vertical direction of the sliding groove 45a is at least L4.

If the vertical distance of the sliding groove 45a required before the backrest 4 is almost in the upright state to the rocking state is shorter than L4, the back outer shell 14 is attached to the back column without removing the guide member 45. In order to attach to the body 5, the distance in the vertical direction of the sliding groove 45a may be formed slightly longer than L4. Conversely, as the vertical distance L3 sliding grooves 45a required before the backrest 4 is locking state from a substantially upright state when larger than the L4 requires long distance L3, a pair of guide members 45 is formed. In any case, if configured as in the present embodiment, it is only necessary to fix in advance the pair of guide members 45 having the vertically long sliding grooves 45a on the left and right sides of the vertically long opening 40, and the necessary number of parts and as mounting Engineering is an effect that very Umate less.

  The arrangement position of the upper end of the guide member 45 is set to a higher (upper) position than the upper edge 40a of the opening 40 (see FIGS. 2 to 4, FIG. 20, etc.).

The lateral pin 43 is axially connected to the guide member 45 so that it can move up and down, so that the inner surface side of the back outer shell 14 in the backrest 4 (the space between the back outer shell 15) and the back strut body. The upper part of the back strut body 5 is connected to the upper part of 5 so that it can move up and down, and the backrest 4 is in the normal state (see FIG. 2A) and the locking state (see FIG. 2B). On the other hand, the back outer shell 14 is covered on the back side (main body portion 14a). Accordingly, since the connecting portion that can be moved up and down by the lateral pin 43 and the guide member 45 is always hidden by the back outer shell 14, the appearance of the back side of the chair is improved.
In particular, as shown in FIG. 19, when the backrest 4 is in the normal state, the upper end 18 a of the back strut body 5 (with the back strut cover body 18 attached to the back strut 17) is positioned on the inner surface side of the back outer shell 14. In this state, the upper edge 40a of the opening 40 overlaps with the dimension H1 and the upper end 18a is located close to the inner surface of the main body 14a of the back outer shell 14, so that the opening 40 (particularly the upper edge of the main body 14a Even if a person's finger touches the vicinity of 40a), the finger does not get caught in the gap between the back outer shell 14 and the back strut body 5 (back strut cover body 18). Of course , human clothes are not caught in the gap.

  In the rocking state of the backrest 4, the backrest 4 tilts backward while sinking with respect to the back column body 5 having a constant posture. Also at this time, the back side of the back outer shell 14 covers the upper portion of the back column body 5 (see FIG. 2B). In that case, the upper part of the back strut body 5 (upper part of the back strut cover body 18) greatly enters the inner surface side of the back outer shell 14 (the space between the back outer shell 15). The back shape of the back strut cover body 18 should be designed so that the back face of the back strut cover body 18 is close to the edge 40a and no gap is formed. The rocking state includes a backward tilting posture in the middle from the normal state where the backrest 4 is substantially upright to the maximum backward tilting posture.

  Further, in either the normal state (see FIG. 2A) of the backrest 4 or the locking state (see FIG. 2B), the side edge of the opening 40 extending in the vertical direction and the back strut cover body 18 It is preferable that the gap formed between the side surfaces extending in the vertical direction is set to be as small as possible. This is to prevent clothes or the like of a person approaching or contacting the back side of the back outer shell 14 from being caught in the gap.

  Furthermore, in any state of the backrest 4 in the normal state (see FIG. 2A) and the rocking state (see FIG. 2B), a part of the side surface of the back column cover body 18 in the side view of the chair. The back strut cover body 18 and the back outer shell 14 are shaped so that there is no gap between them and the back of the back outer shell 14.

<Keru Replacing the seat base 9 via the connecting shaft 25 and a base portion 14b and the seat on the bracket 10 structure>
As shown in FIG. 17, the input-fit the inner bushing 52 to the bearing portion 32 at the base 14b of the back outer shell 14. Next, as described above, the slider holding part 27 having a U-shaped cross section on both the left and right sides of the seating bracket 10 is fitted on the slider member 28, so that the seating bracket 10 is attached to the horizontal piece 9 b of the seat base 9. On the other hand, it is inserted from the front (see FIG. 15), and then the outer bush 53 is fitted into the mounting portion 26 of the seat bracket 10 from the outside of the bearing portion 32, whereby the seat bracket 10 and the base portion of the back outer shell 14 are connected. They are connected so as not to separate.
Then, insert the connecting shaft 25 from the outside of one of the outer bush 53, on the outside of the bush 24a of the seat base 9 is to concatenation of a base 14b of the seat on the bracket 10 and the back outer shell 14. Further, the left and right sides of the U-shaped cross section of the slider holding portion 27 of the seat on the bracket 10, you fitted on the slider member 28. Then, since the slider member 28 in which the horizontal piece 9 of the seat base 9 is housed is vertically surrounded by the slider holding portion 27, it is possible to remove it from the seat receiving portion 3 even if the seat bracket 10 is lifted by hand during assembly work. Absent. Further, the seat bracket 10 only slides back and forth and does not tilt after side view.

The front end of the locking spring 30 is fitted to the front spring receiving body 31b fixed to the inner surface of the front plate 9c of the seat base 9 before the seat bracket 10 is attached to the seat base 9. A rear spring receiving body 31 a is disposed at the rear end of the locking spring 30. When the upper end of the back outer shell 14 is pulled forward before the connecting shaft 25 is attached, the base 14b of the back outer shell 14 and the seat bracket 10 are retracted by rotating around the lateral pin 43. Since the position of the spring support piece 29 is also retracted, the rear spring receiving body 31a is fixed to the spring support piece 29, and then the connecting shaft 25 is moved from the outside of one outer bush 53 while pushing the upper end of the back outer shell 14 backward. Insertion and the connecting shaft 25 can be inserted at a stretch.
By releasing the hand from the back outer shell 14 and positioning the connecting shaft 25 at the rear end of the bush 24a, the locking spring 30 can be pre-tensioned. By this pretension (initial biasing force of the locking spring 30), the seat bracket 10, and thus the seat 3 as a whole, is biased to the rear of the chair with respect to the seat receiving portion 2, and the backrest 4 takes an upright posture.

In addition, as shown in FIG.11 and FIG.12, the structure of the overlap coupling | bonding (lap joining) of the seat outer shell 11 and the seat inner shell 12 is the female of the several places provided in the seat inner shell 12 and the seat front part 12a. This is a fitting structure of the mold engaging part 61 and a plurality of male engaging parts 62 projecting upward on the surface of the seat outer shell 11, and a plurality of female engaging parts provided on the seat rear part 12b. This is a fitting structure of the part 63 and a plurality of male engaging parts 64 projecting upward on the surface of the base part 14b of the back outer shell 14, and the seat rear part 12b with respect to the sinkable base part 14b. for coupling, and the female engaging portion 66 and the corresponding left and right pair of male engagement portion 65 is provided.
In addition, as shown in FIG. 5, the configuration of the overlapping connection (lap joining) between the back outer shell 14 and the back inner shell 15 is such that the plurality of female engaging portions 67 provided on the back inner shell 15 and the back are connected. The outer shell 14 has a fitting structure with a plurality of male engaging portions 68 projecting upward on the surface of the main body portion 14a.

< Pip tilt configuration of seat inner shell >
The structure of the pip tilt in which the seat inner shell is constituted by separate parts of the seat front portion and the seat rear portion, and the seat rear portion can sink and move relative to the seat front portion is disclosed in Japanese Patent Laid-Open No. 2002-10859 (Patent No. 3863353). As shown in Japanese Laid-open Patent Publication No.), the engagement between the rear end of the seat front part and the front end part of the seat rear part can be turned up and down relatively and can be pivoted up and down. It is known that the structure and the front part of the seat and the rear part of the seat are separate parts connected by a hinge (not shown).

  However, in these configurations, since the front and rear members only bend at the straight and left longitudinal straight portions such as the fitting component and the hinge portion, the front-rear direction region of the bent portion is narrow and the flexibility is low. Therefore, even if the upper surface of the seat inner shell is covered with a seat seat made of a cushion material, the bent portion presses the lower surface of the thigh of the seated person within a narrow range, and the sitting comfort is not necessarily good. In addition, because it is a separate part, assembly work was required to connect both parts.

On the other hand, in the present embodiment, a configuration is adopted in which the sitting comfort is good and the assembling work is simplified. That is, the seat inner shell 12 has a seat front portion 12 a and a seat rear portion 12 b, and a large number of slits 12 c that are long in the left-right direction of the seat 3 between the seat front portion 12 a and the seat rear portion 12 b. A large number of slits 12c are formed in a zigzag shape in the left-right direction and the front-rear direction of the seat 3 around the portion where the body pressure of the seated person acts strongly (see FIGS. 10 to 12). It should be noted that the width of the slit 12c is such that cracks do not enter the end of the slit 12c due to repeated bending action at the end of the slit 12c (excluding those opened at the left and right side edges of the seat inner shell 12). A corner portion such as a round circle having a diameter slightly larger than the dimension is formed.

  Further, as shown in FIG. 11, a U-shaped cross-section reinforcing portion 12 d is continuously provided on the lower surface side of the seat inner shell 12 so as to straddle the lower surfaces of several slits 12 c. The group of slits 12c having such a configuration allows downward stretching and deformation due to the body pressure of the seated person, and as a result, high fit is obtained. Further, since the seat inner shell 12 is connected to the seat front portion 12a and the seat rear portion 12b via a bendable region having a large number of slits 12c corresponding to the seat 3, the seat 3 is allowed to bend. Has been. The central portion of the bend of the seat 3 is set approximately at the position where the seat bone of the seated person hits or slightly in front of it. Furthermore, since only the rear seat portion 12b is engaged with or connected to the base portion 14b of the back outer shell 14, when the back outer shell 14 tilts backward while sinking, only the rear seat portion 12b can be bent so as to sink downward.

  Since it comprised as mentioned above, the seat inner shell 12 can be integrally formed with a synthetic resin, and the connection operation | work with the seat front part 12a and the seat rear part 12b becomes unnecessary.

  As another embodiment, a connecting portion capable of moving up and down with the upper portion of the back column body may be provided in a space between the back cushion body 16 and the back side member supporting the back side.

Furthermore, as another example of the back side member, there is one in which an L-shaped frame in a side view is fixed to the back surface of the back member that supports the back surface of the back cushion body 16. This frame may be made of metal.
That is, first, it is a gate-shaped frame as viewed from the back, consisting of a pair of left and right L-shaped vertical frame portions and an upper frame portion connecting the upper ends of the vertical frame portions. Fix to the left and right center of the member. A portion surrounded by a pair of left and right vertical frame portions and an upper frame portion is defined as an opening 40. Furthermore, the lower end base part of a pair of left and right vertical frame parts extends in the direction of the seat base 9, and the front end of the lower end base part is configured to be rotatably connected to a connecting shaft 25 described later. The back column body 5 fixed to the seat base 9 is disposed in the opening 40, and there is a connecting portion that can move up and down between the upper portion of the back column body 5 and the inner upper portions of the pair of left and right vertical frame portions. It is set as the provided structure.
Even with this configuration, regardless of the posture of the backrest, the vertically movable connecting portion between the back side member (= back member and frame) and the upper portion of the back column body is always hidden by the back side member. become.

DESCRIPTION OF SYMBOLS 1 Leg apparatus 2 Seat receiving part 3 Seat 4 Backrest 5 Back support body 9 Seat base 10 Seat upper bracket 11 Seat outer shell 12 Seat inner shell 13 Seat cushion body 14 Back outer shell 14a Main part 14b Base 15 Back inner shell 16 Back cushion Body 17 Back strut 17a Pipe member 18 Back strut cover body 19 Seat base 24a (having a long sliding groove) Bush 25 Connecting shaft
26 Mounting portion 28 Slider member
29 Spring support piece 30 Locking spring 40 Opening 43 Horizontal pin 45 Guide member
45a Sliding groove (guide groove)

Claims (1)

A rocking chair in which the backrest leans backward while the backrest sinks and the seat moves forward at the same time with respect to the back column body fixed to the seat receiving part of the upward opening supported by the legs,
The backrest is attached to the upper portion of the back strut body by fitting the vertical guide groove provided in either one of the backrest or the back strut body and the left and right lateral pin provided in the other. While being connected to be movable up and down and having a base portion extending forward toward the lower side of the seat,
The seat receiving portion is provided with elongated holes on the left and right sides in the front-rear direction of the chair, and a seat bracket that supports the seat is slidable in the front-rear direction and mounted in a non-rotatable side view.
By connecting a pair of left and right downward mounting portions provided on the seat bracket and a bearing portion provided on the base of the backrest with one connecting shaft inserted through the left and right elongated holes, the seat is It is allowed to tilt backward while moving back and the backrest sinking,
In addition, a locking spring supported from behind by a spring support piece projecting downward on the seat bracket before the connecting shaft extends and contracts without changing the side view posture while hidden inside the seat receiving portion. Arranged to
Rocking chair.

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