JPH0131769Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a square pipe fixture used to connect square pipes such as square pipes and hexagonal pipes or to fix them to a fixing member. .

[Conventional technology]

Conventionally, square pipes such as those described above have been widely used for temporary structures such as decorations in exhibition halls, display shelves in stores, etc. When fixing to a fixing member such as, a square pipe fixture is required. However, unlike the case of round pipes, conventional fixing devices of this type do not allow relative rotation of the square pipe to be fixed and the fixing device for screw fitting, so the end of the square pipe to be fixed cannot be attached to the fixing device. In many cases, these fittings were fitted into insert members and tightened with screws or the like from the outer circumferential side.

[Problem that the invention attempts to solve]

However, with the conventional square pipe fixing device as described above, the screws and other fasteners are exposed to the outside, making it unsightly, and the workability of fixing the fixed square pipe and the fixing device is not good. However, there was a problem in that it was difficult to firmly fix these.

The object of this invention is to provide a square pipe fixture that can solve the above-mentioned problems.

[Means for solving problems]

The rectangular pipe fixing device of this invention includes one or more pipe insertion members that protrude from the contact surface of the rectangular pipe to be fixed and have a circular outer cross section, and the base of the pipe insertion member is connected to the inner circumference of the rectangular pipe. The insertion member is formed to have an outer diameter that is substantially inscribed in the surface, and a tip portion having a smaller outer diameter than the base portion is integrally connected to the base of the insertion member through a tapered portion, and the tip portion of the insertion member has a circular shape. A pressure ring made of an elastic material with a cutoff section at one end in the circumferential direction and a lead piece located on the tip side of the pressure ring are fitted so that they can rotate and move in the axial direction, and the lead piece can be attached and removed within a square pipe. A cam surface is formed on the tip surface of the lead piece so that the amount of protrusion in the axial direction changes along the circumferential direction of the insertion member. A protrusion protruding from the outer circumferential surface of the tip of the insert member is slidably engaged with the cam surface of the lead piece from the tip side of the insert member, and the insert member and square pipe are fitted and rotated relative to each other to make pressure contact. The ring rides on the tapered part of the insertion member to expand its diameter and is brought into pressure contact with the inner peripheral surface of the square pipe.

[Effect]

Since the rectangular pipe fixing device of this invention is constructed as described above, after the rectangular pipe is fixed with the fixing device, the insert member and all the parts attached to the insert member are not exposed to the outside and the appearance is maintained. Good. In addition, the fixture and the square pipe can be fixed by simply rotating the fixture and the square pipe relative to each other at an angle of 360° or less.
Alternatively, these fixations can be released, making work easier.
Furthermore, by rotating the fixture and the square pipe relative to each other while the insertion member and the square pipe are fitted together, the lead piece engages with the square pipe and is prevented from rotating. The protrusion provided on the member slides on the cam surface of the lead piece, and the lead piece is pushed toward the base of the insertion member, and the pressure ring is also pushed toward the base by the lead piece, causing the pressure ring to move toward the tapered portion. The square pipe runs over the surface, expands in diameter due to elastic deformation, and is pressed against the inner circumferential surface of the square pipe.The pressure ring pulls the square pipe toward the contact surface and pushes it from the inside to the outside. and the fixture are firmly fixed without fear of coming off.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 to 4.

In FIGS. 1 and 2, reference numeral 1 denotes a fixture base having a cubic external shape, and two rectangular pipes 2 to be fixed facing each other are provided with abutting surfaces 3 on the base 1,
The contact surface 3 is formed to have the same outer shape as the end surface of the square pipe 2. Pipe insertion members 4 whose axial directions are perpendicular to the contact surfaces 3 are respectively protruded. These insert members 4 are formed in the shape of a pipe with a circular outer diameter cross section, and the insert members 4 are inserted into the holes 5 of the base 1.
The holes 6 are connected to each other. The base 7 of the insert member 4 is formed to have an outer diameter that is almost inscribed in the inner circumferential surface of the square pipe 2, and a tip 9 having a smaller outer diameter than the base 7 is integrated with the base 7 through a tapered portion 8. It is connected to. A pressure contact ring 10 and a lead piece 11 disposed on the distal end side of the pressure contact ring 10 are fitted into the distal end portion 9 of the insertion member 4 so as to be rotatable and movable in the axial direction. The pressure contact ring 10 is made of an elastic wire such as spring steel and has a cutoff portion 12 at one location in the circumferential direction. The lead piece 11 is
It is dimensioned to fit into the square pipe 2 with almost no gaps, and has an external cross-sectional shape similar to the inner shape of the square pipe 2, and a pair of cam surfaces 13 are formed on the tip surface. As shown in FIGS. 3 and 4, the amount of protrusion of the cam surface 13 changes along the circumferential direction of the insert member 4, and the amount of protrusion is maximum at a pair of opposing corners of the lead piece 11. , are formed so as not to protrude near the other pair of corners, and a recess 14 is formed at the portion where the amount of protrusion is maximum. A pin 15 passing through the diameter is installed at the tip 9 of the insert member 4, and the pin 15
A protrusion 16 protruding from the outer circumferential surface of the tip portion 9 is formed at both ends of the lead piece 11.
The insert member 4 is slidably engaged with the cam surface 13 from the tip side of the insert member 4 to prevent the insert member from coming off.

In order to fix the rectangular pipe 2 with the fixture of this embodiment, one of the rectangular pipes 2 must be attached to one of the insertion members 4.
, and place the end face of the square pipe 2 on the contact surface 3 of the base 1.
bring it into contact with. In this state, when the square pipe 2 is rotated in any direction relative to the fixture, the lead piece 11 engages with the inner circumferential surface of the square pipe 2 and is prevented from rotating, so the insertion member 4 The projection 16 of the pin 15 installed on the tip 9 of the lead piece 11 is connected to the cam surface 1 of the lead piece 11.
3, and the lead piece 11 touches the base 7 of the insert member 4.
The pressure ring 10 is also pushed toward the base 7 by the lead piece 11. For this reason,
The pressure contact ring 10 rides on the tapered portion 8, expands its diameter through elastic deformation, and is pressed against the inner circumferential surface of the square pipe 2 at four locations, and when the square pipe 2 rotates approximately 90 degrees with respect to the fixture, the protrusion 16 fits into the recess 14 of the cam surface 13. In this state, the square pipe 2 is pulled toward the contact surface 3 by the pressure ring 10 and is also pushed from the inside to the outside, so that the square pipe 2 and the fixture are It is firmly fixed without fear of coming off, and the end face of the square pipe 2 abuts on the contact surface 3 without any gap. Further, by the same operation as described above, the other rectangular pipe 2 can be brought into contact with the other contact surface 3 of the base 1 to fix this and the fixture. Therefore, according to this embodiment, the two square pipes 2 can be connected by simply fitting the pair of insertion members 4 and the pair of square pipes 2 and rotating them relative to each other by about 90 degrees. Since they can be connected and fixed via a fixture, the fixing work can be performed easily and with good workability. In addition, all of the parts such as the insertion part 4 and the pressure ring 10 and lead piece 11 attached thereto are housed in the square pipe 2 and are not exposed to the outside, and only the base 1 is visible from the outside. It looks good because of it. Note that in this state, pin 1
Since the projection 16 of 5 engages with the recess 14 provided in the cam surface 13 of the reed piece 11, the rectangular pipe 2 and the fixture are difficult to rotate relative to each other in opposite directions even due to vibrations. There is almost no rattling between the square pipe 2 and the fixture.

Furthermore, when the square pipe 2 and the fixture are rotated relative to each other by about 90 degrees in the same direction or in opposite directions, the protrusion 16 reaches the part of the cam surface 13 provided on the tip surface of the lead piece 11 that does not protrude. Since the pressing of the pressure ring 10 in the axial direction by the lead piece 11 is loosened, the pressure force applied by the pressure ring 10 is also reduced, and the rectangular pipe 2 can be pulled out from the insertion member 4.

In this invention, the insert member may be formed integrally with the base by cutting, but it may also be fixed to an abutment surface provided on the base by friction welding, resistance welding, or the like. In addition, in this invention, by providing an insertion member with a pressure contact ring, lead piece, etc. attached to any surface of the base as the contact surface, T-type, L-type,
type, cross-shaped pipe joints, etc. may be obtained, and insert members may be provided on all six sides of the cubic base.

Furthermore, as shown in FIG. 5, a screw 17 is provided on the end surface of the cylindrical insertion member 4, and the fixture is fixed to the wall 18 with this screw 17, and the surface of the wall 18 is brought into contact with the square pipe 2. This invention can be applied to things that do not have a base, such as when fixing one square pipe 2 to a fixed member such as a wall as the surface 19. In addition, in Figure 5,
The same reference numerals as in FIGS. 1 and 2 indicate corresponding parts.

This invention is not limited to square pipes with a square cross section, but can also be applied to square pipes with rectangular, hexagonal, or octagonal cross sections. It can also be used to connect pipes that pass fluid.

And, this idea is based on the number of cam surfaces of the lead piece,
The length (angle) is not limited to the above embodiment, and the protrusion that engages the cam surface does not need to penetrate the insertion member, and multiple pressure rings may be fitted to one insertion member. The insert member and the base need not necessarily have holes.

[Effect of idea]

As explained above, according to the present invention, the insertion member protruding from the abutting surface of the square pipe to be fixed and the square pipe are fitted, and they are rotated relative to each other at an angle of 360 degrees or less, such as 90 degrees. This allows you to fix the fixture and the square pipe, and then reverse the procedure to release the fixation and disassemble the fixture and square pipe, making assembly and disassembly easier. In the fixed state, all parts such as the insert member, the pressure ring attached to the insert member, and the lead piece are housed inside the square pipe and are not exposed to the outside, giving it a good appearance. is attracted to the contact surface side and is pushed from the inside to the outside, thereby fixing the fixture and the rectangular pipe, resulting in the effect that they can be firmly fixed without fear of coming off.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view showing one embodiment of this invention in a used state, Fig. 2 is a perspective view of the same in an unused state, Fig. 3 is a front view of the lead piece, and Fig. 4 is a partial cross-sectional view of the lead piece. FIG. 5 is a side view taken in the direction of the arrows in the figure, and FIG. 5 is a partially sectional side view showing another embodiment of this invention in a state of use. 1... Fixture base, 2... Rectangular pipe to be fixed,
3...Abutment surface, 4...Pipe insertion member, 7...Base, 8...Tapered part, 9...Tip part, 10...Pressure ring, 11...Lead piece, 12...Separation part, 13...Cam surface, 16...Protrusion, 19...
Contact surface.

Claims (1)

[Scope of utility model registration request] One or more pipe insertion members protruding from the contact surface of the square pipe to be fixed and having a circular outer cross section, and the base of the pipe insertion member is formed to have an outer diameter that is approximately inscribed in the inner peripheral surface of the square pipe. A tip portion having a smaller outer diameter than the base portion is integrally connected to the base portion of the insert member through a tapered portion, and a cut-off portion is provided at one location in the circumferential direction at the tip portion of the insert member. The provided pressure ring made of an elastic material and the lead piece located on the distal side of the pressure ring are fitted so as to be rotatable and movable in the axial direction, and the lead piece is removably fitted into the rectangular pipe and is The lead piece is formed into an external shape that engages with a square pipe, and a cam surface whose protrusion amount in the axial direction changes along the circumferential direction of the insert member is formed on the distal end surface of the lead piece, and the outer circumferential surface of the distal end of the insert member is The protrusion protruding from the lead piece is slidably engaged with the cam surface of the lead piece from the tip side of the insert member, the insert member and the rectangular pipe are fitted and rotated relative to each other, and the pressure ring is attached to the cam surface of the insert member. A square pipe fixture characterized in that the diameter is expanded by riding on a tapered part, and the fixture is brought into pressure contact with the inner peripheral surface of the square pipe.