JPH0354610Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to the structure of the leg of a chair, and more specifically, by molding the leg of the chair with synthetic resin, it realizes weight reduction and streamlines the process. This invention relates to a chair leg structure that enables cost reduction and design freedom.

[Conventional technology]

Conventionally, chair leg structures have been limited to those made of metal in order to satisfy the strength required for chair legs. However, such metal legs are not only heavy, have many parts, and require finishing processes such as painting, making the manufacturing process complicated and costly, as well as being limited in terms of design. Ta. Therefore, studies have been conducted to reduce weight by molding synthetic resin into the chair legs, and to reduce costs by freeing up designs and streamlining the manufacturing process. In order to satisfy the required strength, the legs must be made thick, making them extremely large and requiring a large amount of resin material. The elongated hole needs to have the same diameter in the upper and lower parts in order to support the column without wobbling. However, it is practically difficult to form a molded product with vertically long holes without a draft angle, so it is conceivable to try adding a draft angle, but in that case, the thickness of the support also needs to be considered. The problem is that it has to be tapered. For example, as legs of a chair made of synthetic resin, Japanese Utility Model Publication No. 44-2499 discloses that a bearing part that obstructs the leg axis and each leg body protruding radially from the upper end of the bearing part are made of plastic material at one end. A radially stable leg for a single-legged chair has been disclosed, but even in this invention, only the part below the bearing part is made of plastic, and the leg shaft (corresponding to the pillar) support part is made of plastic. There is no mention of this, and the bearings and stabilizing legs cannot meet the required strength with plastic materials alone, so they are constructed using reinforcing materials such as core metal and steel frames, and the strength of the legs depends on those metal materials. That's what I'm doing.

[Problem that the invention attempts to solve]

Thus, in the past, it has not been possible to solve the above-mentioned problems and create chair legs made of synthetic resin. The present invention solves the manufacturing problems mentioned above in making the chair legs from synthetic resin, as well as the strength required for the chair legs. , it is made of synthetic resin that satisfies the strength required for the legs, making it lightweight, and by streamlining the manufacturing process by reducing the number of parts and processes, it not only achieves cost reductions. It is an object of the present invention to provide a chair leg structure in which the design of the chair legs can be made more flexible by molding synthetic resin.

[Means for solving problems]

In order to achieve the above object, the present invention forms an upwardly open opening groove in the upper part of a cylinder whose diameter decreases downward, and forms an annular groove on the outer periphery including the opening groove. A leg body is formed by integrally molding a leg foot part from a synthetic resin radially from the lower part of the support cylinder part with a locking groove, and the diameter of the inner surface of the support cylinder part is reduced in order to fit into the support cylinder part of the leg body. The outer surface shape is the same as the shape,
A cylindrical support part is formed in which the inner space is formed to have the same diameter on the upper and lower sides, and the upper outer periphery of the cylindrical support part has a height that fits into the opening groove of the leg support cylinder part and whose tip reaches the outer surface of the opening groove. a top cap for supporting a column, which is provided with a protrusion having a similar shape and a fitting groove recessed at a position corresponding to the locking groove on the outer surface side of the tip;
A locking groove of the leg body formed when the cylindrical support part of the top cap is fitted into the support cylinder part of the leg body, and the protrusion of the cylindrical support part is fitted into the opening groove of the support cylinder part. An object of the present invention is to provide a chair leg structure characterized by comprising: an elastic annular member having an inner diameter that can be externally fitted into an annular groove formed by a top cap and a fitting groove of a top cap;

[Effect]

The leg structure of the chair according to the present invention has the above configuration, in which the cylindrical support part of the top cap is inserted through the upper opening of the support cylindrical part of the leg body, and the protrusion of the top cap is inserted into the opening groove of the support cylinder part. The legs are constructed by assembling the legs and the top cap by fitting an elastic annular member into an annular groove formed by the locking groove of the support cylinder and the fitting groove of the top cap. be.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to embodiments shown in the drawings.

The leg structure of the chair in the example shown in the figure includes a leg body 1 in which a supporting cylinder part 2 and a leg foot part 3 are integrally molded of hard synthetic resin, and a leg body 1 made of hard synthetic resin in the same way as the leg body 1. The top cap 4 has a support space 18 for supporting the support support 17 of the chair inside, and the cylindrical support part 7 of the top cap 4 is inserted through the upper end opening 6 of the internal space 5 of the support cylinder part 2. They are fitted together and fixed with an elastic annular member 8.

The leg body 1 has an annular stepped portion 9 formed in the upper end of a cylinder whose diameter is tapered downward with the inner space 5 directed downward, and whose outer surface lower part is tapered toward the outer surface of the cylinder. The 9-forming portion has a vertically extending vertically extending upper end edge tapered to facilitate insertion of a protrusion 19 of the top cap 4, which will be described later. A cut groove in the direction is formed to form the opening groove 10, and a horizontal annular groove is formed across the entire circumference of the opening groove 10 at a position on the outer surface of the stepped portion 9 that includes the opening groove 10. A locking groove 11 is provided, and a bottom surface 13 of the lower end of the cylinder is formed with a through hole 12 in the center that penetrates downward from the internal space of the cylinder.The lower outer surface of the support cylinder part 2 has a honeycomb structure inside and is approximately reverse in cross section. U-shaped legs and feet 3 are integrally molded and protrude radially.

Moreover, the top cap 4 that fits into the upper part of the leg body 1 is made by integrally opposing two mutually symmetrical members 4', 4' in the form of dividing a substantially cylindrical member in the vertical longitudinal direction. The fitting recesses 14 and the fitting protrusions 15 provided at corresponding positions on the abutment surfaces of the legs 4' and 4' can be fitted into one body, and the supporting cylinder part 2 of the leg 1 is attached to the upper end surface. Disc-shaped top plate portion 1 having a larger shape than the upper end portion
6, and the lower surface of the top plate portion 16 has an outer surface having the same shape as the reduced diameter shape of the inner surface of the support tube portion 2 and decreasing in diameter downward so that it can fit into the support tube portion 2 of the leg body 1. A cylindrical support part 7 having a shape and an interior thereof penetrates the top plate part 16 and forms a space for supporting a chair support 17 having the same diameter on the top and bottom to form a support space 18, and the cylindrical support part On the lower surface of the top plate part 16 at the upper end of 7, there is a protrusion 19 having a substantially rectangular cross section formed by abutting protrusions 19', 19' provided on both members 4', 4' at the joint position of both members 4', 4'. In addition, at other positions, the same-shaped protrusion 19 can be fitted alone into the opening groove 10 on the upper part of the support cylinder part 2, and when fitted into the opening groove 10, the tip will be connected to the outer surface of the annular step part 9. and a locking groove 11 having the same shape as the locking groove 11 formed on the outer surface of the stepped portion 9 is provided at the tip of the protrusion 19 at a position corresponding to the locking groove 11 formed on the outer surface of the stepped portion 9 when the protrusion 19 is fitted into the opening groove 10. This groove is formed as the fitting groove 20.

In order to assemble the leg 1 and the top cap 4 together to form a leg, the two members 4',
The cylindrical support part 7 formed by opposing the parts 4' is inserted,
The protrusion 19 of the top cap 4 is inserted into the opening groove 1 of the support tube 2.
0 is fitted. In this state, sky cap 4
The lower surface of the four top plate parts 16 is locked to the upper end of the support cylinder part 2, and the shape of the internal space 5 of the support cylinder part 2 and the external shape of the cylindrical support part 7 of the top cap 4 are the same, so that the legs 1 and the top cap are connected to each other. The diameter of the fitted contact surface between the leg 1 and the top cap 4 is reduced downward so that the top cap 4 is tightly fitted, so that the downward movement of the top cap 4 is completely regulated. The fitted state of the top cap 4 and the top cap 4 is strong without play, and furthermore, the outer surface of the annular step 9 on the upper part of the support tube 2 and the tip of the protrusion 19 of the top cap 4 form a continuous outer peripheral surface, and The locking groove 11 and the fitting groove 20 formed respectively form a horizontal annular groove, and an elastic annular member 8 having an inner diameter that can be externally fitted into the groove, for example, a metal C.
By fitting a ring or a rubber ring or the like to prevent the top cap 4 from coming off upward from the support tube 2, the top cap 4 and the legs 1 can be assembled together and the legs of the chair can be fixed. It composes.

When the seat 21 is connected to the legs of the chair configured as described above and used as a chair, by inserting the column 17 on the lower surface of the seat 21 into the column support space 18 of the top cap 4, the two of the top cap 4 one member 4',
Since the column support space 18 formed by 4' has the same diameter on the top and bottom, the column 17 has the same diameter as the column support space 18.
Since the column is supported by a large contact surface in the vertical direction, the column is supported securely without wobbling. In addition, in this embodiment, the support cylinder portion 2
A downward through hole 12 is formed in the bottom surface 13 of the lower end,
When a gas cylinder is used as the support 17,
The lower end of the rod 23 of the gas cylinder 17 can be fixed. Note that the top cap 4 does not necessarily need to be composed of two members as in this embodiment, and since the internal space may be shorter than that of the support tube 2, it can be molded with resin even if the top and bottom have the same diameter. Although it may be formed as an integral piece, molding with resin is easier if it is formed into two members as described above.

Furthermore, the chair leg structure of the present invention has a simple connection structure in which the legs 1 made of separate members and the top cap 4 are fitted together and locked by the elastic annular member 8. Therefore, it is extremely easy to attach and detach, and by replacing only the top cap 4 with another, it can also be used as the leg of a chair with a different shape of the seat support 17, making it extremely versatile as each member can be replaced. It is something. Note that 22 in the figure is a leg cover.

As described above, in the chair leg structure according to the present invention, the legs and the top cap are molded as separate members, and the internal space of the support tube of the leg, which serves as the support for the column, is tapered downward. The radial shape facilitates molding as a draft angle during molding with synthetic resin, and an internal space is formed in the upper part of the leg body as a column support space with the same diameter above and below, increasing the contact area with the column. By fitting the top cap molded with synthetic resin, it satisfies the strength required for the legs and can support the pillars reliably without wobbling, making the legs of the chair lighter. In terms of design as well, it is possible to have freedom in design without being subject to the restrictions that are imposed when manufacturing by processing metal. Furthermore, since the inside of the support tube can be formed as a larger space than the pillar shape, the amount of resin material required for molding the legs can be reduced, and since the support tube and leg foot are integrally molded, the number of parts and manufacturing process can be reduced. This makes it possible to reduce costs by reducing

[Effect of idea]

As mentioned above, the leg structure of the chair according to the present invention is
An opening groove opened upward is formed in the upper part of the cylindrical body whose internal space is reduced in diameter downward, and an annular groove is formed on the outer periphery including the opening groove, and a locking groove is formed at the bottom of the supporting cylinder part. A leg body formed by integrally molding a leg foot part from synthetic resin in a radial manner, and an outer surface having the same diameter reduced shape as the inner surface of the support cylinder part in order to fit into the support cylinder part of the leg body, and an internal space. The top and bottom are formed to have the same diameter to constitute a cylindrical support part, and the upper outer periphery of the cylindrical support part has a height that fits into the opening groove of the leg support cylinder part and that the tip reaches the outer surface of the opening groove. a support column support top cap having a shape and a protrusion with a fitting groove recessed at a position corresponding to the locking groove on the outer surface side of the tip; It is composed of a locking groove on the leg body and a fitting groove on the top cap, which are formed when the cylindrical support part is fitted and the protrusion of the cylindrical support part is fitted into the opening groove of the support cylinder part. It is characterized by an elastic annular member having an inner diameter that can be fitted externally into an annular groove formed in the upper and lower legs. By forming the support space in the same way as the tapered shape, and by forming the pillar support space inside the top cap to have the same diameter on the top and bottom, it is possible to support the pillar without wobbling, and it is possible to mold it with synthetic resin. By integrally molding the cylindrical part and the legs and feet with synthetic resin, it is possible to reduce weight and improve strength, as well as reduce the number of parts and processes, streamlining the manufacturing process and reducing costs. The present invention realizes freedom of design through synthetic resin molding, and provides a versatile chair leg structure that can be used with different support sizes by simply replacing the top cap.

[Brief explanation of the drawing]

Fig. 1 is a side partial sectional view of the leg structure of a chair according to the present invention, Fig. 2 is a partially omitted bottom view of the leg structure of the chair, and Fig. 3 is an end view of the leg foot. 2, B is an end view taken along B-B line, C is an end view taken along C-C line, and FIG. 4 is a perspective view showing the main parts of the leg structure of the chair according to the present invention. Figure 5 is a side view of the sky cap, Figure 6 is a plan view of the sky cap, and Figure 7 is a side view of the sky cap.
The figure is a side view of the upper part of the support tube. 1: Leg body, 2: Support cylinder part, 3: Leg foot part, 4: Top cap, 5: Internal space, 6: Upper end opening, 7: Cylindrical support part, 8: Annular elastic member, 9: Annular step part ,1
0: Opening groove, 11: Locking groove, 12: Through hole, 1
3: Bottom surface of cylinder, 14: Fitting recess, 15: Fitting convex part, 16: Top plate part, 17: Strut, 18: Strut support space, 19: Protrusion, 20: Fitting groove, 21: Seat Department,
22: Leg cover, 23: Cylinder rod.

Claims (1)

[Claims for Utility Model Registration] An opening groove that opens upward is formed in the upper part of the cylindrical body whose inner space is reduced in diameter downward, and an annular groove is formed on the outer periphery including the opening groove, and a locking groove is formed. A leg body formed by integrally molding a leg foot part from a synthetic resin radially from the lower part of the support cylinder body, and a leg body having a reduced diameter shape on the inner surface of the support cylinder part in order to fit into the support cylinder part of the leg body. A cylindrical support part is formed in which the inner space is formed to have the same diameter on the upper and lower sides, and the upper outer periphery of the cylindrical support part fits into the opening groove of the leg support cylinder part, and the tip part is on the outer surface of the opening groove. A top cap for supporting a column is provided with a protrusion having a height and shape that reaches the desired height and has a fitting groove recessed at a position corresponding to the locking groove on the outer surface side of the tip; and a supporting cylinder portion of the leg body. The locking groove of the leg and the fitting groove of the top cap formed when the cylindrical support part of the top cap is fitted to the top cap and the protrusion of the cylindrical support part is fitted into the opening groove of the support tube. A chair leg structure comprising: an elastic annular member having an inner diameter that can be fitted into an annular groove;