JPS6130540Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a cross-shaped connection device for pipes in a chair, etc., in which the frame supporting the seat and the frame supporting the back are both made of round pipes. .

Technical background and purpose of the invention In this type of chair, the so-called pipe chair, in which the frame supporting the seat and the frame supporting the back are joined at one intersection on each of the left and right sides, the center As a result, both frames tend to rotate relative to each other, and it is difficult to prevent this movement and maintain a stable chair posture.

The present invention is directed to providing a connecting device for a pipe chair as described above, which can firmly and stably fix the cross-connected portions of the round pipe frames to each other without rotating them.

Structure of the invention This invention is such that the frame 1 that supports the seat 2 and the frame 3 that supports the back 4 are both made of round pipes, and the frame 1 that supports the seat 2 is a frame that supports the back 4. In a chair or the like in which both frames 1 and 3 are joined in a cross-like manner so as to be located inside the frame 3, an intervening piece 5 made of a synthetic resin molded product is inserted between the joined parts of the frames 1 and 3. A nut 9 is welded and fixed to the contact portion of the outer frame 3 that contacts the intervening piece 5, while the frame 3 is fixed to the contact surface of the intervening piece 5 that abuts the frame 3.
A curved concave portion 6b that closely contacts the circumferential curved surface of the pipe and a concave portion 7 corresponding to the nut 9 are formed,
Further, a curved concave portion 6a is formed on the abutting surface of the intervening piece 5 that abuts on the inner frame 1, and the concave portion 6a is in close contact with the pipe peripheral curved surface of the frame 1. 5 and the inner frame 1 are provided with bolt insertion holes 8, 1b, and 1c, and bolts 10 are inserted into the bolt insertion holes 8, 1b, and 1c from the inside of the inner frame 1, and the bolts 10 are threaded. The striped portion 10a is connected to the nut 9.
The intervening piece 5 of both the frames 1 and 3 is screwed to the
A pipe coupling device for a chair or the like, characterized in that both the frames 1 and 3 are fastened and fixed by fastening the inner peripheral walls that are in contact with each other through the intervening piece 5. This is a summary.

Embodiments Hereinafter, this invention will be explained based on illustrated embodiments.

In the illustrated embodiment, reference numeral 1 denotes a front leg frame made of a round steel pipe that supports the seat 2, and is bent so as to surround the flat seat 2 from the side to the rear, with both ends 1a, 1a being vertical. It makes up the front legs of. Reference numeral 3 denotes a rear leg frame made of a steel round pipe that supports a slightly curved band-like back portion 4, which is bent into a dogleg shape on both sides and has both ends 3a, 3.
A constitutes an inclined rear leg.

This rear leg frame 3 is the front leg frame 1.
Both frames 1 and 3 are connected in a cross-shaped manner via intervening pieces 5 and 5 so as to be located outside of the frame. The intervening pieces 5, 5 are made of an integrally molded piece of hard synthetic resin such as ABS resin, which is inserted between the joints of the frames 1, 3, and have a substantially rectangular parallelepiped shape along the front leg frame 1 in the longitudinal direction. A surface 5a facing the frame 1 is formed with a horizontally curved groove-like concave portion 6a that is in close contact with the circumferential curved surface of the front leg frame 1, and a surface 5b facing the rear leg frame 3 is formed with a concave portion 6a around the circumferential surface of the rear leg frame 3. It is provided with a concave portion 6b in the form of an inclined curved surface groove that is in close contact with the curved surface, and both side portions are inclined toward the front leg frame 1 side. Further, a recess 7 is formed in the center of the recess 6b on the side of the rear leg frame 3.
A bolt insertion hole 8 is provided which communicates with the concave portion 6a on the front leg frame 1 side from the bottom.

At the joining part of both pipes 1 and 3, an intervening piece 5
A nut fitting hole 3b is drilled in the rear leg frame 3 that contacts the concave portion 6b of the nut 9, and a nut 9 having a flange portion 9a at one end is fitted into the fitting hole 3b from the other end side, and the flange portion 9a is welded. Fixed. The flange portion 9a is fitted into the recess 7 of the intervening piece 5 inserted between the frames 1 and 3. Bolt insertion holes 1b and 1c coaxial with the nut 9 are bored in the front leg frame 1 that abuts the concave portion 6a of the intervening piece 5. Then, the bolt 10 with the collar pipe 11 fitted to the shaft portion 10c is inserted into the bolt insertion holes 1b, 1c, 8 from the inside of the front leg frame 1, and the bolt 10 is inserted into the bolt insertion holes 1b, 1c, 8 from the inside of the front leg frame 1.
A threaded portion 10a of 0 is screwed into the nut 9.

In this screwed state, the color pipe 11
One end is locked to the bolt head 10b, and the other end is in contact with the inner peripheral surface of the front leg frame 1, so that the bolt head 10b is fitted into the front leg frame 1. By tightening the inner circumferential walls of both frames 1 and 3 that are in contact with the intervening piece 5, both frames 1 and 3 are fastened and fixed.

However, without using the collar pipe 11, it is possible to tighten both frames 1 and 3 by directly tightening the inner peripheral walls of both frames 1 and 3 that are in contact with the intervening piece 5 using nuts 9 and bolts 10. It may be fixed in place.

Effects of the invention As described above, the pipe coupling device according to the invention includes the frame 1 supporting the seat 2 of the chair and the back 4.
An intervening piece 5 made of synthetic resin molding is inserted between the cross-shaped joints with the frame 3 that supports the frame 3, and the abutment frames 1 and 3 are attached to each surface of the intervening piece 5 that abuts both frames 1 and 3, respectively. Curved recesses 6a and 6b are formed in close contact with the circumferential curved surface of the round pipe, and both frames 1 and 3 are fastened and fixed with bolts 10 and nuts 9 via intervening pieces 5.
Even if both the frames 1 and 3 are connected at one place each on the left and right as shown in the first figure, each frame 1 and 3 fits into each of the recesses 6a and 6b and rotates around the joint. Movement is completely prevented, the joint is firmly and reliably fixed, and the chair posture can be maintained stably.

Furthermore, both frames 1 and 3 are fastened together by screwing the threaded portion 10a of the bolt 10 passing through the front leg frame 1 and the intervening piece 5 into the nut 9 welded and fixed to the rear leg frame 3. This is done by tightening the inner peripheral walls of both frames 1 and 3 that are in contact with intervening piece 5, so both frames 1 and 3
Unlike when tightening from both sides with bolts that pass through both pipes, it is possible to tighten firmly without causing crushing deformation of the pipe, thereby achieving even more secure fixation of the joint. sell.

Further, the outer frame 3 is provided with a nut 9 at the contact portion that contacts the intervening piece 5, that is, the inner portion of the frame 3.
Since the frame 3 is simply fixed by welding, the nuts 9 and the like are not visible at the connecting portion of the frame 3. Moreover, the bolts 10 are inserted into the bolt insertion holes 1b, 1c, and 8 formed in the frame 1 and the intervening piece 5 from the inside of the inner frame 1, and the threaded portions 10c of the bolts 10 are screwed into the nuts 9. Since the bolt head 10b is fitted together, it is also possible to completely fit the bolt head 10b into the pipe of the inner frame 1, and in this way the bolt head 10b can be completely hidden from view. Even if the head 10b protrudes to some extent, it is further inside the inner frame 1, so
It is completely hidden by the seat part 2 and cannot be seen, or even if it is visible, there is no noticeable inconvenience. Therefore, it is possible to improve the external appearance of the connecting portion.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, with Figure 1 being a perspective view of the entire chair, Figure 2 being a plan view thereof, and Figure 3 being a perspective view of the entire chair.
The figure is a sectional view of the joint between the front and rear leg frames, Figure 4 is a perspective view of the intervening piece, Figure 5A is a plan view thereof, Figure 5B is a front view thereof, and Figure 6 is a joint between the front and rear leg frames. FIG. 1... Frame supporting the seat, 1b, 1c...
... Bolt insertion hole, 2 ... Seat, 3 ... Frame that supports the back, 4 ... Back, 5 ... Intervening piece, 6
a, 6b...Concave portion, 7...Concave portion, 8...Bolt insertion hole, 9...Nut, 10...Bolt, 10a
...screw part.

Claims (1)

[Scope of utility model registration request] The frame 1 that supports the seat 2 and the frame 3 that supports the back 4 are both made of round pipes, and the frames are arranged so that the frame 1 that supports the seat 2 is located inside the frame 3 that supports the back 4. 1,
In a chair or the like in which frames 1 and 3 are joined together in a cross-shaped manner, an intervening piece 5 made of a synthetic resin molded product is inserted between the joining parts of the two frames 1 and 3, and the outer frame 3 is in contact with this intervening piece 5. A nut 9 is welded and fixed to the portion, while a curved concave portion 6b that comes into close contact with the circumferential curved surface of the pipe of the frame 3 and a concave portion 7 corresponding to the nut 9 are provided on the contact surface of the intervening piece 5 that abuts the frame 3. is formed, and a curved recess 6a that comes into close contact with the circumferential curved surface of the pipe of the frame 1 is formed on the contact surface of the intervening piece 5 that contacts the inner frame 1.
Bolt insertion holes 8, 1b, 1c are formed in the intervening piece 5 and the inner frame 1 so as to be coaxial with the nut 9, and bolts 10 are inserted into the bolt insertion holes 8, 1b, 1c. is inserted from the inside of the inner frame 1, the threaded portion 10a of the bolt 10 is screwed into the nut 9, and the inner peripheral walls of both frames 1 and 3 that are in contact with the intervening piece 5 are connected to the intervening piece. 5. A pipe coupling device for a chair or the like, characterized in that both frames 1 and 3 are fastened and fixed together by being fastened together through a pipe 5.