JP2014233334A - Chair leg device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase an aesthetic sense and strength of a leg device, in a chair using a gas cylinder in a leg strut and enabling nesting.SOLUTION: A fixed base 9 is fixed on an upper end of a leg strut 4, and right and left support frames 10 are projectingly provided upward to the fixed base 9. A seat 2 is attached to a movable base 13, and the chair can be nested back and forth by flipping up the seat 2. The leg device 1 includes front side branched legs 6 and rear side branched legs 7 of two of right and left. An interval W1 between the tips of the front side branched legs 6 is made smaller than an interval W2 between the tips of the rear side branched legs 7. Also, the front side branched legs 6 are inclined into a linear shape and the rear side branched legs 7 are inflated to an upper side. Thereby, the front and rear leg devices 1 are permitted to be fit deeply. A root height of each of the branched legs 6, 7 is the same, so that the chair is superior in an aesthetic sense and can be prevented from falling with high strength.

Description

  The present invention relates to a chair leg device having a group of branch legs that extend radially in a plan view, and particularly to a chair leg device capable of nesting that can be fitted in the front-rear direction by flipping up the seat. .

  In order to save storage space without using a chair, fitting (nesting) the chairs in the front-rear direction (horizontal direction) is widely performed. This type of nestable chair is often called a pipe chair with a skeleton made of metal pipe, but it can be nested with a chair (rotary chair) that uses an extendable gas cylinder as a leg post. A structure is also proposed, and examples thereof are disclosed in Patent Documents 1 and 2.

  Specifically, in Patent Document 1, each leg has two front and rear branch legs, and each branch leg extends in a radial direction from the center cylinder and gas is supplied to the center cylinder. It has a structure in which a leg support composed of a cylinder is held. The height of the base of the front branch foot is made lower than the height of the base of the rear branch foot, and the spread angle of the front two branch feet is set to the rear 2 The spread angle of the branches of the book is smaller than the chair, and the chairs placed in the front and back can be fitted back and forth with the leg device aligned in the same planar view when the seat is flipped up to a substantially vertical position. (Nesting is possible.)

  Moreover, the chair of patent document 1 is equipped with the attitude | position alignment mechanism which aligns the relative attitude | position of a seat and a leg apparatus uniformly, when a seat is flipped up, and, thereby, the chair located before and behind is the same as a leg apparatus. They are held in a planar view and fit together.

  On the other hand, the leg device of Patent Document 2 also has four branch legs, but each of these branch legs has a cross-like posture in plan view, is inclined at the same length and at the same angle, and is positioned at the front and rear. The leg devices can be fitted to each other by changing the posture in plan view.

Japanese Patent No. 3730119 Japanese Patent No. 4306922

  In Patent Document 2, the chair leg devices positioned at the front and rear are not aligned in posture, so that not only the appearance is bad, but also, for example, a person kicks the leg device with his / her legs so that the leg devices of the front and rear chairs fit together. It is necessary to change the posture of the legs in the same manner. However, when the front and rear leg devices are in the same planar view posture in a nesting state as in Patent Document 1, it has a good appearance and the chairs can be fitted with each other. is there.

  However, in Patent Document 1, there is still room for improvement in terms of improving the appearance because the base heights of the front branch legs and the rear branch legs are different. In addition, since the support height of the central cylinder is different at the base between the front branch leg and the rear branch leg, the central cylinder tends to tilt forward due to a load from above, which is not preferable in terms of strength.

  The present invention has been made in view of such a current situation, and aims to improve appearance and strength while being a leg device that can be fitted back and forth in the same posture.

  In the present invention, at least three branch legs extend in a radial direction in a plan view from a central cylinder that holds a vertical posture, and the group of branch legs is divided into a front and rear branch legs that are asymmetrical in the front-rear direction. In the constructed leg device, the front branch foot and the rear branch foot are attached to a central cylinder at the same height position, and the plan view posture and the side view posture of the front branch foot and the rear branch foot are asymmetric in the front-rear direction. Thus, it is allowed to fit the leg devices positioned at the front and rear in the same posture in plan view.

  The invention of claim 2 embodies claim 1, and in this invention, there are two left and right front branch legs and two rear leg legs, and the spread angle of the left and right front branch legs in plan view The left and right rear branch legs have different spread angles, and the left and right spacing between the left and right front branch legs and the left and right rear branch legs are different from each other. It is designed to fit into each other in the posture.

  The invention of claim 3 embodies claim 2, and in this invention, the front branch leg is inclined over the entire length so that the height gradually decreases from the root to the tip. On the other hand, the rear branch leg is a contoured part where the height is almost the same in a certain range near the base part, and the slope part becomes lower toward the tip after that. As a specific example of the present invention, in claim 4, the rear branch leg is curved in a concave shape downward in a side view.

  In the gas cylinder, the inner cylinder and the outer cylinder are slidably fitted, but in the gas cylinder used for the leg column, the inner cylinder and the outer cylinder are usually rotated relative to each other. Therefore, the seat rotates horizontally with respect to the leg device. On the other hand, in order to fit the leg devices of the front and rear chairs in the same plan view posture, it is necessary to align the relative postures of the seat and the leg device during nesting. Therefore, also in the present invention, as in Patent Document 1, it is preferable to provide a posture aligning device having a plan view posture of the seat and the leg device by raising the seat.

  In the present invention, since the front branch leg and the rear branch leg have the same height, the appearance is very good, and the center cylinder does not have a force to defeat it, so the support of the leg strut is stable. Excellent in properties and strength.

  Further, the front branch leg and the rear branch leg can be either one and the other can be two, or either one can be two and the other can be three. Thus, when the front branch legs and the rear branch legs are formed in two, there is an advantage that deep fitting can be easily realized while ensuring high support stability.

  Particularly, the configuration of the front branch leg and the rear branch leg according to claim 3 is particularly preferable because the rear branch leg and the front branch leg in the front and rear chairs can be fitted deeply. In the case of claim 3, the contoured part and the inclined part of the rear side branch leg may be continuous in a bent posture, but if the whole is bent as in claim 4, stress concentration is prevented and strength is increased. Can contribute to up.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the chair which concerns on embodiment, (A) is a perspective view in the attitude | position which raised the seat, (B) is a perspective view in the state which fell the seat. (A) is a perspective view of the leg device in an inverted state, (B) is a perspective view of the leg device viewed from above, and (C) is a partial side view of the chair with one support frame removed. . (A) is a front view of a leg apparatus, (B) is a top view of the leg apparatus in a nesting state. It is a side view of the state of nesting with the support frame on one side omitted. (A) is a partially separated perspective view with the leg device of the second embodiment turned upside down, (B) is a perspective view of the protective member used in (A), and (C) is used in the first embodiment. The partial perspective view of the protective member which can be done, (D) is a fragmentary sectional view of 3rd Embodiment.

(1). Outline of First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. First, the outline of the first embodiment will be described. In the following description and claims, the words “front and rear” and “left and right” for specifying the direction are used, but this is based on a state viewed from a person who normally sits on a chair.

  As shown in FIG. 1, the chair includes a leg device 1, a seat 2, and a backrest 3 as major elements. As clearly shown in FIGS. 2A and 2B, the leg device 1 is provided integrally with a leg column 4 made of a gas cylinder, a center tube 5 that holds the leg column 4, and an upper end portion of the center tube 5. Each of the front and rear branch legs 6 and 7 has a front branch leg 6 and a rear branch leg 7, and casters 8 are attached to the tips of the branch legs 6 and 7, respectively.

  The central cylinder 5 and the branch legs 6 and 7 are integrally manufactured by aluminum die casting or resin molding. However, each of the branch legs 6 and 7 and the central cylinder 5 are formed as separate members and are welded together. It is also possible to fix with, for example.

  The branch legs 6 and 7 extend from the central cylinder 5 in the radial direction, and the leg devices 1 arranged in the front and rear are fitted to each other by being asymmetrical in front and back in plan view and side view. Allowed (details will be described later). For example, metal pipes or sheet metal processed products can be used for the branch legs 6 and 7. When using a metal pipe, it is excellent in strength and good appearance if it is formed as a substantially triangular shape with a mountain-shaped cross-section downward and gradually from the base toward the tip.

  A box-shaped fixed base 9 is attached to the upper end of the leg support 4 with an upward opening. As shown in FIGS. 1 and 2, a pair of left and right protruding from the left and right outer sides of the seat 2 to the upper side of the seat 2 is fixed to the fixed base 9. The support frame 10 is fixed, and the backrest 3 is connected to the upper end portion of the support frame 10 so as to be pivotable back and forth. The fixed base 9 is closed from above with a cover 11.

  The seat 2 is mounted on a movable base 12 having a square shape in plan view so as to be movable back and forth, and is urged backward by a spring (not shown). When the backrest 3 tilts backward, the seat 2 moves forward. For example, as shown in FIG. 2C, a pair of left and right suspension arms 13 are integrally provided at the rear end of the movable base 12, and the upper end of the suspension arm 13 is rotated to a vertical midway height position of the support frame 10. It is connected as possible. Accordingly, the seat 2 can be flipped up around the middle part of the support frame 10.

(2). Leg device The bases of the branch legs 6 and 7 in the leg device 1 have the same height, and are branched from the upper end of the central cylinder 5 at the same height. Then, as shown in FIG. 3B, by making the left-right distance W1 between the front ends 8 of the left and right front branch legs 6 smaller than the left-right distance W2 between the front ends of the rear side branch legs 6, the front and rear leg devices 1 are moved back and forth. It is allowed to fit. To be precise, W1 is the distance between the outer ends of the left and right casters 7 on the front side leg 6, and W2 is the distance between the inner ends of the left and right casters 7 on the rear side leg 7.

  Further, as shown in FIG. 4, the front side branch leg 6 is inclined in a substantially straight line shape in a side view so as to be gradually inclined from the base toward the tip, while the rear side leg 7 has a slight range near the base. The height 7a is not different from the height, and the slope 7b is further lowered toward the tip. The side surfaces of the front and rear branch legs 6 and 7 are thus formed. By changing the viewing posture, it is set so that the front side branch leg 6 of the chair located at the back is greatly inserted below the rear side branch leg 7 of the chair located at the front side. The rear branch leg 7 is curved in a concave shape (or so as to expand upward) downward as a whole.

  Since the bases 6 and 7 have the same height at the base, the aesthetics are remarkably superior to those with different heights as in Patent Document 1, and the center tube 5 has each branch foot 6. , 7 are supported at the same height position, the central cylinder 5 does not tend to fall down and is excellent in terms of strength. Moreover, since the rear branch leg 7 has an arch structure swollen upward, stress concentration can be prevented and high strength can be secured. In the present embodiment, the rear branch foot 7 is longer than the front branch foot 6, but an arch structure swollen upward is particularly suitable because it can maintain high strength.

  The front branch leg 6 can be in a reverse relationship to the rear branch leg 7, but in order to prevent it from interfering with the user's foot, the front branch leg 6 is It is preferable to make the whole slant by shortening.

  As shown in FIG. 2A, each of the branch legs 6 and 7 has an L-shaped cross section having an upper plate and vertical plates 6c and 7c suspended from one side edge thereof, and the vertical plates 6c and 7c are formed of the upper plate. Hanging from the left and right outer edges. Of course, the branch legs 6 and 7 are of various types such as a cross-section T-type (form of FIG. 5A) in which the vertical plates 6a and 7a are positioned in the middle portion in the width direction of the upper plate and a U-shaped cross-section opened downward The cross-sectional shape can be adopted.

(3). Other Embodiments / Buffer Material In the second embodiment shown in FIG. 5 (A), the branch legs 6 and 7 have a T-shaped cross section in which the vertical plates 6c and 7c are positioned in the intermediate portion in the width direction. It has become. A resin cushioning material (protective material) 13 is provided on the rear branch foot 7 in order to prevent the rear branch foot 7 from being damaged by collision during nesting. The cushioning material 13 extends long along the lower surface of the vertical plate 7c, and a stopper portion 13a projecting downward is provided at the base end portion located on the attachment side of the rear side branch foot 7 so that the front side foot foot 6 of the chair to be fitted hits. doing. The vertical plate 7a is fixed to the rear branch leg 7 with screws (not shown). Accordingly, the shock absorber 13 has a screw hole 14.

  As shown in B), the upward protrusion 13b provided on the cushioning material 13 is fitted into the groove provided on the vertical plate 7c, and the boss 13c provided on the base end located on the base side of the rear branch foot 7 is rearward. It is fitted in the side branch leg 7. For this reason, the buffer material 13 is held so as not to be displaced. A screw hole 14 is also formed in the boss 13c.

  In the case where the rear branch foot 7 of the first embodiment is also provided with a cushioning material, the cushioning material 13 of FIGS. 5A and 5B can be used as it is, as shown in FIG. It is also possible to use one provided with an upward plate 13d that overlaps the inner surface of 7c.

  FIG. 5D shows an example in which the branch legs 6 and 7 are manufactured by sheet metal processing. That is, in this example, the branch legs 6 and 7 are composed of a groove member 15 having a substantially V-shaped cross section and an upper surface member 16 overlapping the upper surface thereof, and both are integrally joined by welding. The upper surface member 16 is gently curved in an upward concave shape in the solid line display, but a shape that is gently curved upwardly like a one-dot chain line or a flat shape can also be adopted. Although the upper surface member 16 protrudes to the outside of the groove mold material 15, it is possible to eliminate the protrusion.

  Now, when a molded product is employed for the branch legs 6 and 7, the mold must be changed to change the design, which may increase the cost. When a pipe is used, a mold is not required (a mold for bending is required), but the size of commercially available products is limited. The nature is low. In addition, the pipe product cannot be provided with a hook-like overhanging portion.

  On the other hand, when a sheet metal processed product is employed as shown in FIG. 5D, since the material plate is punched and bent and then welded, it is possible to flexibly cope with a design change and a projecting portion. It is also easy to provide. In addition, in the case of pipe material, since the opening area of the base is limited, there is a limit to the joint area with the center tube, but since the size and shape of the base can be set freely in the processed sheet metal product, This makes it possible to easily realize a robust structure by increasing the bonding area.

  Such a feature of the processed sheet metal product exists irrespective of nesting, and therefore, the form of FIG. 5D can be widely applied to furniture leg devices.

  The present invention can be manufactured as a chair. Therefore, it can be used industrially.

1 leg device 2 seat 3 backrest 4 leg support (gas cylinder)
6 Front side branch foot 7 Back side side foot 7a Contour portion 7b Inclined portion 8 Casters 9 Fixed base 10 Support frame 12 Movable base

Claims (4)

A configuration in which at least three branch legs from the central cylinder that holds the vertical posture extend in a radial direction in a plan view, and the group of the branch legs is composed of front and rear branch legs that are asymmetrical in the longitudinal direction Because
The front branch legs and the rear branch legs are attached to a central cylinder at the same height position, and the front branch legs and the rear branch legs are positioned in the front-rear direction by making the front view posture and the side view posture asymmetric in the front-rear direction. It is allowed to fit the leg device back and forth in the same posture in plan view,
Chair leg device. The front branch legs and the rear branch legs exist in two on the left and right sides, and the spread angle of the left and right front branch legs and the spread angle of the left and right rear branch legs in plan view are different from each other, and the tips of the left and right front branch legs By making the left-right distance between the left and right and the left-right distance between the tips of the left and right rear branch legs different, the leg devices positioned in the front and rear are fitted to each other with the same posture,
The chair leg device according to claim 1. The front side branch leg is inclined over the entire length so that the height gradually decreases from the base portion toward the tip, while the rear side branch foot has a certain height close to the base portion. It becomes an almost constant level part that does not change, and after that it is an inclined part whose height decreases toward the tip,
The chair leg device according to claim 2. The rear branch leg is in a shape curved in a concave shape downward in a side view,
The chair leg device according to claim 3.

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