JP2008302063A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair permitting easy assembly of an armrest device and having an excellent strength for supporting the armrest device. <P>SOLUTION: The armrest device 5 has an armrest support 47, and an inward part 47a extending under a seat is integrally formed in the armrest support 47. An attaching plate 50 is fixed to the end of the inward part 47a, and the attaching plate 50 is fixed to the outer side face of a tilting frame 21 with a screw 51. An upper piece 50a and an upper locking piece 54 are integrally attached to the upper end of the attaching plate 50, and an engagement hole 55 into which the upper locking piece 54 is inserted is bored in a bridge member 40 of the tilting frame 21. The position of the engagement hole 55 serves as an engagement part 56. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chair provided with an armrest device.

  There are various attachment structures for the armrest device in the chair. For example, when viewed from the mounting position of the armrest device, in general, a) a mode of mounting on the base fixed to the upper end of the leg column, b) a mode of mounting on the lower surface of the seat (for example, Patent Document 1), and c) a backrest Are roughly divided into aspects (for example, Patent Documents 2 and 3) that are attached to the tilting frame to which is attached.

The armrest device generally includes an elbow strut that extends in the vertical direction, and an inward portion that enters the lower portion of the seat is continuous with the lower end of the elbow strut, and the tip of the inward portion is screwed to the seat, the base, and the tilting frame. It is fixed with. And patent document 1, 2 has fitted the front-end | tip of the inward part in an armrest apparatus to the seat or the receiving part of the tilting frame from the horizontal direction, and is fixing with the screw in that state.
Japanese Patent Laid-Open No. 10-127410 JP 2004-49735A JP 2005-152157 A

  Among these patent documents, the one of Patent Document 2 is provided with an elbow mounting projecting from the tilting frame toward the left and right outer sides, and the end surface of the elbow mounting portion and the end surface of the inward portion of the elbow support are overlapped to be horizontally long. When fixing with bolts, the end face of the elbow mounting part and the end face of the inward part of the elbow post are positioned to form an unevenness that fits each other. The load on the arm directly acts on the screw, so the support strength is low, and when installing the armrest device, the person must hold the armrest device by hand and screw in the screw while holding the position and posture. Work is troublesome.

  On the other hand, the configurations of Patent Documents 1 and 3 have excellent support strength because the downward load acting on the armrest device is supported not only by the screw but also by a wide range of seats and receiving members. Since it is temporarily held by the seat or the tilting frame before fixing, the mounting workability is excellent.

  Patent document 3 relates to the prior application of the applicant of the present application, but the present invention partially follows the idea of the prior application invention, and further simplifies and assembles the structure while ensuring high support strength. It is an object to ensure ease.

  The chair of the present invention includes a seat and an armrest device, and the armrest device includes an elbow strut positioned outside the seat and an armrest supported by the elbow strut, and a lower end of the elbow strut The inward portion that has entered the lower portion of the seat is continuous, and the tip of the inward portion is fixed to a receiving member disposed below the seat with a screw.

  According to the first aspect of the present invention, in the above configuration, an attachment plate fixed to a side surface of the receiving member with a lateral screw is provided at a tip of the inward portion of the elbow strut. An upper locking piece that extends toward the center of the seat in a front view is integrally formed at the upper end, while an engagement portion having an engagement hole into which the upper locking piece can be inserted from the outside is formed on the receiving member. In the state where the mounting plate is formed and fixed to the side surface of the receiving member, the base portion of the upper locking piece overlaps the receiving member from above, and the portion of the upper locking piece that enters the engagement hole Is in contact with or in close contact with the engaging portion of the receiving member from below.

  According to a second aspect of the present invention, the invention according to the first aspect is applied to the rocking chair described in Patent Document 3, and in this invention, the receiving member is provided on both the left and right sides of the base fixed to the upper end of the leg column. The tilt frame has a backrest and a front end connected to the base so that the tilt frame can be tilted rearward. Further, the left and right tilt frames include the tilt frame. The bridge and the bridge member are connected so as to be relatively rotatable so that when the tilting frame is tilted backward, the seat is also retracted and tilted backward.

  In the second aspect of the present invention, the bridge member is further formed with an engagement hole into which the upper locking piece can be inserted when the elbow post is tilted toward the seat so that the elbow post can be inserted. In a state in which the mounting plate overlaps the side surface of the tilting frame in the posture, the upper locking piece overlaps a portion of the bridge member that is on the inner side of the engagement hole as viewed from the front.

  According to a third aspect of the present invention, in the first or second aspect, the upper locking piece is formed in the front / rear intermediate portion of the mounting plate, and the mounting plate has a shape of a front / rear object. The board can be used for left and right armrest devices.

  In the present invention, since the upper locking piece of the inward portion of the elbow strut overlaps the receiving member from above, a large load can be accurately supported. In addition, since there is a certain size between the elbow rest and the tip of the inward portion, the load acting on the elbow rest acts as a moment on the inward portion of the elbow strut. The applied downward load acts to separate the upper part of the mounting plate from the side surface of the receiving member (or to tilt the elbow struts outward), but in the present invention, the upper part of the mounting plate is separated from the receiving member. When trying to do so, the upper locking piece comes into contact with the engaging portion of the receiving member from below according to the seesaw principle, thereby preventing the separation action of the mounting plate.

  Thus, the present invention is capable of accurately supporting a large downward load and has a strong resistance to the action of tilting the elbow struts outward, and the armrest device ensures a remarkably high support strength. Can do.

  Further, in the present invention, the armrest device is temporarily held even when it is not held by a person during installation. Furthermore, the mounting plate is fixed to the side of the receiving member with a screw, and the screw is rotated in a sideways position. Therefore, the armrest device can be easily operated by rotating the screw while the chair is normally placed on the floor. Can be attached to or removed from. As described above, the armrest device can be temporarily held on the receiving member and the screw can be easily rotated, so that the armrest device can be easily attached and detached. It can be easily realized by the user.

  And, as the fixing means of the armrest device, it is sufficient if the elbow strut of the armrest device is provided with a mounting plate having an upper locking piece, and the receiving member has a simple structure having only an engagement hole. Therefore, it is easy to process and contributes to cost reduction. In particular, in the configuration of claim 2, a part of the bridge member for interlocking the backrest and the seat is also used as the engaging portion, and the engaging portion is automatically formed only by opening the engaging hole. Therefore, the processing is very simple and is therefore particularly suitable.

  If the structure of Claim 3 is employ | adopted, since one type of attachment plate can be used for both right and left armrest apparatuses, the effort of member management and a process can be reduced, and it can contribute to a cost reduction. It is also possible to make the elbow struts have a symmetric shape / structure, or the entire armrest device can have a symmetric shape / structure, which can further contribute to cost reduction.

  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 based on FIGS. 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. 4 is a perspective view of a tilt frame and a back frame. It is.

  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 FIG. 3, 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. The seat inner shell 12 is fixed to a seat outer shell (seat receiving member) 14 disposed below the seat inner shell 12 with screws. The seat outer shell 14 functions as a strength member that supports the seat inner shell 12, and is supported by a metal intermediate fitting 17 disposed below the seat inner shell 12 so that the front and rear positions can be adjusted.

  The backrest 4 is provided with a metal back frame 16 having a quadrilateral front view shown in FIG. 4 and a back inner shell 17 (see FIG. 1) attached to the front surface thereof. A back cushion 18 is provided on the front surface of the back inner shell 17. It is stretched. The back cushion 18, the back inner shell 17, and the bag-like cloth 19 are covered. The back frame 16 is covered from the back side with a back cover 20 (see FIG. 2B) having a shape similar to the back frame 16 (square shape).

  The rear ends of the left and right tilt frames 21 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 16 by welding. The tilt frame 21 is connected to the base 2 so as to be tiltable rearwardly, and the armrest device 5 is attached to the tilt frame 21, as will be described in detail later.

(2). 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, the locking mechanism, the seat synchronization mechanism, and the surrounding structure will be described with reference to FIGS. 5 and 6 in addition to the previous drawings. 5 and 6 are separated perspective views of members constituting the locking mechanism and the seat synchronization mechanism.

  In the present embodiment, the front part of the intermediate metal fitting 15 is connected to the front part of the base 2 by the first shaft 23 so as to be tiltable rearward and retractable, and the tilting frame 21 is tilted rearward by the second shaft 24 to the rear part of the base 2. Further, the rear part of the intermediate metal fitting 15 is connected to the middle part of the tilting frame 21 so as to be rotatable by the third shaft 25, and the backrest 4 is locked (backward tilted) by these kinds of link mechanisms. At the same time, the seat 3 tilts backward while moving backward in conjunction with the back tilt of the backrest 4, and the locking of the backrest 4 and the sync of the seat 3 are mainly elastically supported by a locking spring 26. ing. This will be described below.

  As clearly shown in FIGS. 5 and 6, the base 2 is formed in a box shape having an upward opening with left and right side plates 2a, and an inner bracket 27 to which the leg support 5 is fitted is fixed to the rear part. A forward opening groove 28 for supporting the first shaft 23 is formed in the front portion of the left and right side plates 2 a in the base 2.

  The intermediate metal fitting 15 is provided with left and right L-shaped side frames 29 extending in parallel. A first shaft 23 made of a round pipe is fixed to the front part by welding, and a round pipe made of a round pipe is attached to the rear part. The three shafts 25 are fixed by welding. A guide groove (not shown) formed in the lower surface portion of the seat outer shell 16 is slidably fitted to the flange view of the side frame 29. As shown in FIG. 5 and FIG. 1 (B), a cover 30 is attached to the intermediate bracket 15 from both the left and right sides.

  As can be understood from FIG. 5, a portion of the first shaft 23 inside the base 2 includes a left and right front bush 31 entering the forward opening groove 28 of the base 2 and a front portion sandwiched between the left and right front bushes 31. The partial spring receiver 32 is fitted. The left and right front bushes 31 are fixed to the base 2 with screws. A stopper member 33 for preventing lateral deviation is fixed to the left and right intermediate portion of the first shaft 23. The left and right front bushes 31 are made of synthetic resin and formed in a U-shape (bifurcated shape) when viewed from the side, and the first shaft 23 is slidably fitted back and forth in the space. The front spring receiver 32 is formed in a U shape in a side view of the rearward opening so that the first shaft 23 is fitted.

  Inside the base 2, a spring receiving slider 34 supported so as to be slidable to the left and right on the front surface of the inner bracket 27 is disposed, and a rear spring receiving 35 is fitted on the spring receiving slider 34. The locking spring 26 is sandwiched between the front and rear spring receivers 32 and 35. When the handle 9 is rotated, the spring bearing slider 34 moves left and right, and then the rear spring bearing 35 moves back and forth due to the wedge action. As a result, the initial elastic force of the locking spring 26 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 24 made of a round pipe is fixed to the front end portion of the left / right tilt frame 21. As can be understood from FIG. 6, the second shaft 24 is sandwiched from above and below by the upper center bush 37 and the lower center bush 38, and the upper and lower center bushes 37, 38 are connected to the base 2 via the center metal fitting 39. It is fixed to the lower surface. The upper center bush 37 is fitted to the base 2 so as not to move left and right.

  As shown in FIG. 3B, the third shaft 25 is provided with a metal plate bridge member 40 arranged so as to be bridged over the left and right tilt frame 21, a split synthetic resin rear bush 41 and a pressing rear. They are connected by a metal fitting 42. The rear bush 41 and the rear fitting 42 are arranged on the upper surface of the bridge member 40 one by one on the left and right. The bridge member 40 is fixed to the back frame 10 by welding.

  Between the rear end of the base 2 and the lower end of the back frame 16, a back gas cylinder 43 that can hold the backrest 4 at an arbitrary rearward tilt angle is disposed (the gas cylinder 43 is used for locking and synchronizing the seat 3). It also has an elastic support function.) The back gas cylinder 43 is connected to the base 2 and the back frame 16 so as to be relatively rotatable. For this reason, as shown in FIG. 4, a connecting projection 44 is provided on the left and right middle part of the lower portion of the back frame 16, and a bracket 45 is fixed to the rear part of the left tilting frame 21. The bracket 45 is provided with a lever (not shown) for switching the back gas cylinder 43 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 24 against the elasticity of the locking spring 26 and the back gas cylinder 43, while the seat 3 Is moved backward while being tilted by the pulling action of the third shaft 25 and the sliding of the first shaft 23. 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.

(3). Armrest device and its mounting structure Next, the armrest device 5 and its mounting structure will be described with reference to FIGS. 7 and 8 in addition to the previous drawings. 7A is a separated perspective view, FIG. 7B is a partial perspective view of the armrest device 5, FIG. 8A is a plan view of the main part of FIG. 8A, and FIG. B sectional drawing, (C) is CC sectional drawing of (A).

  As shown in FIGS. 1 and 2A, the armrest device 5 includes an elbow post 47 made of a pipe that extends in the vertical direction on the left and right outer sides of the seat 3 in a front view. An inward portion 47 a that enters below the seat 3 is bent at the lower end of the elbow post 47, and the inward portion 47 a is fixed to the tilt frame 21.

  The elbow support 47 is in a slightly forward tilted position in a side view, and an elevating body (not shown) is fitted in the elevating body so as to be movable up and down, and an elbow pad 48 is attached to the upper end of the elevating body. The lift body is provided with a lever 49 for adjusting the height. The armrest device 5 may have a single structure in which the armrest does not move up and down.

  As shown in FIGS. 7 and 8, a mounting plate 50 that overlaps the outer surface of the tilting frame 21 is fixed to the front end of the inward portion 47a of the elbow support 47 by welding, and includes two front and rear screws (screws, bolts). ) 51 is fixed to the tilting frame 21. Therefore, the mounting plate 50 has a mounting hole 52 and the tilting frame 21 has a female screw hole 53. In addition, as a specific aspect of the female screw hole 53, various methods are adopted such as tapping a pilot hole, burring and setting a tap on this, and fixing a nut to the inner surface of the tilting frame 21 by welding. it can.

  The mounting plate 50 is made of a metal plate such as a steel plate, and an upper piece 50 a that overlaps approximately half of the upper surface of the tilt frame 21 and a lower piece 50 b that overlaps the lower surface of the tilt frame 21 are formed by bending. Both pieces 50a, 50b are formed in a circular arc shape so as to overlap the tilting frame 21 exactly.

  An upper locking piece 54 extending inward (inner direction of the chair) is integrally provided in a state where the upper plate 50a of the mounting plate 50 is slightly stepped down, and the bridge member 40 of the tilting frame 21 is integrally provided. The upper locking piece 54 into which the upper locking piece 54 is inserted is formed. Therefore, the engaging hole 55 and the inner portion of the bridge member 40 are the engaging portion 56. A long hole 58 formed inside the engagement hole 56 in the bridge member 40 is for positioning the rear bush 41.

  The mounting plate 50 has a symmetrical shape as a whole including the upper and lower pieces 50a and 50b and the upper locking piece 54 (the mounting holes 52 are also provided at the longitudinally symmetrical positions). Accordingly, one type can be used for the left and right elbow supports 47.

  For example, as can be understood from FIG. 8B, the left and right side end portions 40a of the bridge member 40 overlap substantially half of the curved upper surface of the upper locking piece 54, and thus the side end portion 40a has a gently curved cross section. It has a shape. The engagement hole 55 is formed by cutting the bridge member 40 so as to open to the left and right sides. For this reason, the bridge member 40 is formed with an open groove 57 that divides the side end portion 40a back and forth. The upper locking piece 54 of the elbow strut 47 is fitted in the open groove 57 with almost no deviation in the front-rear direction.

  When attaching the armrest device 5, as shown in FIG. 8B, the armrest device 5 is tilted so that the elbow support 47 tilts toward the center portion of the seat 3 when viewed from the front. The stop piece 54 is fitted into the engagement hole 55 of the bridge member 40, and then the elbow post 47 returns the posture of the elbow post 47 so that the mounting plate 50 overlaps the outer surface of the upper locking piece 54, and then the screw 51 is tilted. What is necessary is just to screw and fix to the frame 21.

  In this attachment, since the upper locking piece 54 is fitted in the opening groove 57 and the engagement hole 55, the armrest device 5 is held in a predetermined posture even when a person releases his hand. Screwing operation can be done very easily. Further, since the screw 51 is screwed into the tilting frame 21 from the lateral direction, the chair 51 can be easily screwed in without being turned upside down. It can be easily installed and removed.

  Furthermore, by providing the mounting plate 50 with the upper piece 50a and the upper locking piece 5454, it is possible to accurately support the downward load acting on the armrest device 5, and therefore, the fixing plate 50 is fixed with only two screws 51. A high support strength can be ensured even if it is only. In particular, it is particularly preferable to provide the upper piece 50a extending before and after the upper locking piece 54 as in the present embodiment because the support strength can be improved.

  Since the armrest device 5 has a distance between the load application point (elbow rest 48) and the mounting plate 50, a strong downward load acts on the armrest device 5, or the armrest device 5 faces outward. When the load is applied, an external force may be applied to the mounting plate 50 as shown by an arrow X in FIG. In other words, an external force (moment) that tries to tilt the elbow strut 47 outward may act.

  On the other hand, in the present embodiment, since the upper locking piece 54 contacts the lower surface (that is, the engaging portion 56) of the bridge member 40 from below, it strongly resists the external force that tries to tilt the elbow strut 47 outward. As a result, the elbow support 47 can be secured with a high support strength even though it is only fixed with two screws 51.

  When the upper piece 50a and the lower piece 50b are formed on the mounting plate 50 as in the present embodiment, the tilting frame 21 is held from above and below by the mounting plate 50, so that the adhesion to the tilting frame 21 is increased. Support strength is even better. The armrest device 5 may be subjected to an inward external force that tilts the elbow support 47 inward. However, when the upper and lower pieces 50a and 50b are provided on the mounting plate 50 as in the embodiment, the armrest device 5 is tilted by the mounting plate 50. Since the holding force of the frame 21 becomes strong, there is an advantage that a strong strength can be secured even with respect to the inward and outward force. The bridge member 40 can also be provided for reinforcement and armrest attachment without contributing to synchronization.

  In this embodiment, the elbow support 47 is tilted forward in a side view, and although not shown, holes for adjusting the height of the elbow rest 48 are processed in the front portion, and accordingly, left and right The elbow strut 47 is a dedicated product, but if there is no height adjustment mechanism or if there is no front-rear direction in the part constituting the height adjustment mechanism, one type of elbow strut 47 can be Can also be used.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, the receiving member to which the armrest device is attached is not necessarily limited to the tilt frame, and can be attached to, for example, a base or an intermediate bracket (when applied to a chair that does not lock, it is attached to the base or the leg. ). It is also possible to provide a plurality of upper locking pieces on the mounting plate.

It is the perspective view which looked at the chair which concerns on embodiment of this invention from the front. (A) is a front view, (B) is a side view. (A) is a longitudinal side view, (B) is a partially enlarged view of (A). It is a perspective view of a tilting frame and a back frame. It is a perspective view which mainly shows the relationship between a base and an intermediate metal fitting. It is a perspective view which mainly shows the relationship between a base and a tilting frame. (A) is a perspective view of a tilting frame and an elbow post, and (B) is a perspective view showing a form of a mounting plate. The top view of the principal part of (A), (B) is BB sectional drawing in the middle of an assembly | attachment, (C) is CC sectional view taken on the line of (A).

Explanation of symbols

1 leg device 2 base 3 seat 4 backrest 5 armrest device 21 tilting frame 40 bridge member as an example of receiving member 47 elbow post 47a inward portion 48 elbow rest 50 mounting plate 50a upper piece 50c lower piece 54 upper locking piece 55 Fitting hole 56 Engagement part 57 Opening groove

Claims (3)

A seat and an armrest device, the armrest device comprising an elbow strut positioned outside the seat and an armrest supported by the elbow strut; The inward portion that has entered is continuous, and the tip of the inward portion is fixed to the receiving member arranged below the seat with a screw,
A chair called
A mounting plate fixed to the side surface of the receiving member with a lateral screw is provided at the tip of the inward portion of the elbow strut, and an upper member extending to the center side of the seat in front view at the upper end of the mounting plate. While the stop piece is integrally formed, the receiving member is formed with an engaging portion having an engaging hole into which the upper locking piece can be inserted from the outside, and the mounting plate is formed on the side surface of the receiving member. In a fixed state, the base portion of the upper locking piece overlaps the receiving member from above, and the portion of the upper locking piece that enters the engagement hole abuts or closely contacts the engaging portion of the receiving member from below. is doing,
Chair. The receiving member is a tilting frame disposed on both the left and right sides of the base fixed to the upper end of the leg column, and the tilting frame has a back end attached to the front end so that it can tilt backward. Further, the left and right tilt frames are integrally connected by a bridge member made of a metal plate welded to the tilt frame so that when the tilt frame tilts backward, the seat also moves backward and tilts backward. The seat and the bridge member are connected so as to be relatively rotatable,
In addition, the bridge member is formed with an engagement hole into which the upper locking piece can be inserted when the elbow post is tilted toward the seat, and the mounting plate is tilted with the elbow post in the upright posture. In the state of overlapping the side surface of the frame, the upper locking piece overlaps from below the portion of the bridge member on the inner side of the engagement hole in front view.
The chair according to claim 1. The upper locking piece is formed at the front and rear intermediate portion of the mounting plate, and the mounting plate has a shape of the front and rear, so that one type of mounting plate can be used for the left and right armrest devices.
The chair according to claim 1 or 2.

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