JP6858398B2 - Pipe connecting device - Google Patents

Description

The present invention relates to a pipe connecting device, and relates to a pipe connecting device in which work at an assembly site is simple and members are easy to handle.

When joining pipes orthogonally to a pipe column, both were attached by welding, or the connecting plate was addressed and attached with bolts and nuts.

When installing by welding, a gas cylinder, torch, etc. are required, and a person who has acquired a certain technique is required, which deteriorates workability at the site. Further, the one to which the connecting plate is addressed and joined with bolts and nuts has a problem that it cannot be finished neatly even though it requires a lot of man-hours.

A joint structure of members that can be easily operated at an assembly site and can be finished neatly has been proposed (see Patent Document 1). The joining structure of the members described in Patent Document 1 will be described with reference to FIGS. 41 to 43. As shown in the figure, a square pipe column 112 having slits 111 provided in two rows, a square pipe 114 in which a wedge 113 is welded to the opposite inner surfaces of the joint ends, and hooks 115 in opposite directions are formed at one end, and then A female screw 118 is provided on one of a pair of plate pieces 117 having wedge surfaces 116 formed on both outer sides on the way to the other end, and the hook 115 is attached to the two plate pieces 117 by a spring 119 as shown in the figure. It is composed of a pulling member 120 that is urged and cooperated in a spreading direction.

In the joint between the square pipe pillar 112 and the square pipe 114, when the hook 115 of the pulling member 120 is contracted against the urging of the spring 119 and engaged with the slit 111 of each of the pipe pillars 112, the spring 119 is attached. It is caught by the force on the upper and lower ends of the hook 115.

When the pulling member 120 is covered with the joint end of the square pipe 114 and the male screw 121 is screwed into the female screw 118 through the hole of the square pipe 114, the distance between the two pieces of the plate pieces 117 is widened, and the wedge is widened. The 113 and the wedge surface 116 are in contact with each other, and the square pipe column 112 and the square pipe 114 are attracted and joined by the wedge action.

As described above, according to Patent Document 1, it is possible to obtain a clean joining structure of members in a short time without requiring a welding gas cylinder or torch for joining work.

Japanese Unexamined Patent Publication No. 2004-162896

However, in the structure of Patent Document 1 described above, it is necessary to use a special square pipe 114 in which a wedge 113 is welded to the opposite inner surfaces of the joint ends. Therefore, it is necessary to weld the wedge 113 to the square pipe 114, which causes a problem that the work process is increased.

An object of the present invention is to provide a pipe connecting device capable of joining members in a short time without welding the pipes to be joined.

In the present invention, an arm joint metal fitting is engaged with an opening provided in a support column made of a pipe, the arm joint metal fitting is inserted into the arm pipe, and the arm pipe is attached to the support column via the arm joint metal fitting. The arm joint fitting is a pipe connecting device, and the arm joint fitting comprises a lower joint fitting, an intermediate plate that engages with the lower joint fitting, and an upper joint fitting that engages with the intermediate plate. The metal fitting is provided with a downward hook inserted into the opening of the support column, a downwardly open engaging recess that engages with the opening, and an engaging protrusion that engages with the intermediate plate. Be,
The upper joint fitting has an upwardly facing hook inserted into the opening of the support column, an engaging recess opened upward to engage with the opening, and an engaging protrusion engaging with the intermediate plate. When, the screw is provided with a hole to be inserted, the intermediate plate, and the engaging hole is provided to engage the engaging protrusion of the engagement projection and the upper joint metal fitting of the lower joint metal fitting, A screw hole is provided at a position corresponding to the hole of the upper joint metal fitting, a hole through which the screw is inserted is provided in the arm pipe, and a screw is inserted through the hole of the arm pipe into which the arm joint metal fitting is inserted. , The screw is screwed into the screw hole of the intermediate plate, the screw is brought into contact with the lower joint metal fitting, the hooks of the lower joint metal fitting and the upper joint metal fitting are moved, and the engaging recess and the upper side of the lower joint metal fitting are moved. The engaging recess of the joint fitting is firmly held in the opening of the support column, and the arm pipe is attached to the support column via the arm joint metal fitting.

The opening of the strut is a slit provided in line on one side of the strut.

Further, the lower joint metal fitting is inserted into a main body portion, a pair of leg portions bent downward so as to be orthogonal to the main body portion, and a slit of the support column provided in connection with the leg portions. The hook has the hook and the engaging recess provided at the base end of the hook, and the upper joint fitting has a main body and a pair of legs bent upward so as to be orthogonal to the main body. It can be configured to have a portion, the hook inserted into the slit of the support column provided in connection with the leg portion, and the engaging recess provided at the base end portion of the hook.

Further, two engaging projections are provided on the upper surface of the main body of the lower joint fitting, and two engaging projections are provided on the lower surface of the main body of the upper joint fitting. The intermediate plate may be configured to be provided with two engaging holes that engage the two engaging protrusions of the lower joint fitting and the two engaging protrusions of the upper joint fitting. it can.

The length of the body portion of the body portion of the lower joint metal fitting the upper joint metal fitting is formed in the same length, said intermediate plate is formed in a rectangular shape, the length of said intermediate plate, the lower it may be formed in the same length as the main body of the joint fitting and the length of the body portion of the upper side joint bracket.

Further, when the engaging hole of the intermediate plate is aligned with the engaging projection of the lower joint fitting and the intermediate plate is placed on the lower joint fitting, the lower joint is under the screw hole. It is preferable that the upper surface of the main body of the metal fitting is located so that the screw screwed into the screw hole comes into contact with the upper surface of the main body.

Further, the height of the end side of the arm joint metal fitting that combines the lower joint metal fitting, the intermediate plate, and the upper joint metal fitting is formed so as to be in sliding contact with the inner surface of the arm pipe, and the lower joint metal fitting is formed. The legs of the upper joint fitting and the legs of the upper joint fitting can be configured so that their heights are formed to be tapered from the rear end side toward the front.

Further, in the present invention, the arm pipe is provided with a notch on the lower surface, and the lower joint metal fitting is a main body and a pair of legs bent downward so as to be orthogonal to the main body. The hook connected to the leg portion and inserted into the slit of the support column, the engaging recess provided at the base end portion of the hook, and the engaging pedestal provided behind the main body portion. It has a gate portion provided on the engaging pedestal, an opening provided between the gate portion and the engaging pedestal, and a claw portion that engages with the notch portion of the arm pipe. The joint metal fitting includes the main body, a pair of legs bent upward so as to be orthogonal to the main body, the hook connected to the legs and inserted into the slit of the support, and the base of the hook. It has the engaging recess provided at the end and the rear end protruding portion provided behind the main body and inserted into the opening of the lower joint fitting, and the coil spring is provided at the rear end protruding portion. The upper joint fitting is urged forward by the urging force of the coil spring by inserting the rear end protruding portion into the opening.

Further, the intermediate plate is formed in a rectangular shape, a notch is provided on the front side of the intermediate plate , a screw hole is provided on the rear side of the notch, and the intermediate plate is engaged with the rear side of the screw hole. A hole is provided , a long hole is provided behind the engagement hole, and two engagements are formed on the upper surface of the main body of the lower joint fitting so as to be projected from the lower surface of the main body and protrude to the upper surface. A joint protrusion is provided, one engaging portion engages with the notch portion, the other engaging protrusion engages with the elongated hole, and two engaging protrusions are provided on the lower surface of the main body portion of the upper joint fitting. Is provided, one engaging portion engages with the notch portion, the other engaging projection engages with the engaging hole, and the intermediate plate and the upper joint fitting with respect to the lower joint fitting. It can be configured to be integrally movable and supported.

Further, a mountain portion protruding upward is provided on the terminal side of the leg portion of the upper joint metal fitting, and the lower end of the leg portion of the lower joint metal fitting of the arm joint metal fitting and the upper end of the mountain portion of the upper joint metal fitting are formed. It may be formed so as to be in sliding contact with the inner surface of the arm pipe.

Moreover, the intermediate plate is placed on the lower joint metal fitting on the upper joint bracket mounted, with a U-shaped mounting member made of three members from the leaf spring on the intermediate plate It can be configured to be sandwiched and fixed.

Further, if the arm joint fitting is inserted into the arm pipe, the claw portion of the lower joint fitting is engaged with the notch portion of the arm pipe, and the arm joint fitting is attached to the arm pipe. Good.

Further, when the upper joint fitting and the intermediate plate are movably supported by the lower joint fitting in a direction away from the wall surface of the column, and the upper joint fitting comes into contact with the wall surface of the column, the coil spring against the biasing force, the upper joint bracket and to move the direction of the intermediate plate moves away from the wall surface of said post, a hook of the upper joint bracket enters into the arm pipe, hooks of the upper joint metal fitting the strut When exposed to the slit, by the urging force of the coil spring, the said intermediate plate is the upper joint bracket, move forward, the hooks of the upper joint bracket enters into the slit, the upper end portion of the engaging recess slit Located below. Then, a screw is inserted into the hole of the arm pipe, the screw is screwed into the screw hole of the intermediate plate, the upper joint metal fitting is moved upward, and the engaging recess of the lower joint metal fitting and the upper side are at the end of the slit. The engaging recess of the joint fitting can be held, and the arm pipe can be attached to the support column via the arm joint fitting.

According to the present invention, each member can be easily formed without using welding or the like, and the hook of the arm joint metal fitting is engaged with the slit of the support column, and the arm pipe having a hole is inserted into the arm joint metal fitting. , The arm pipe can be attached to the slit of the column by the simple work of tightening with screws.

It is an exploded perspective view which shows the joint metal fittings for an arm used for the pipe connecting device of this invention. It is an exploded side view which shows the joint metal fittings for an arm used for the pipe connecting device of this invention. It is a perspective view which shows the state which attached the lower joint metal fittings of the arm joint metal fittings used for the pipe connecting device of this invention to the slit of a support. It is a perspective view which shows the state which attaches the upper joint metal fitting of the arm joint metal fitting used in the pipe connecting apparatus of this invention to the slit of a support. It is sectional drawing which shows the state which attaches the upper joint metal fitting of the arm joint metal fitting used in the pipe connecting apparatus of this invention to the slit of a column. It is sectional drawing which shows the state which attached the upper joint metal fittings of the arm joint metal fittings used for the pipe connecting device of this invention to the slit of a column. It is a perspective view which shows the state which the arm pipe is inserted into the arm joint metal fitting attached to the slit of a support. It is a top view which shows the state which the arm pipe is inserted from the rear end of the arm joint metal fittings. FIG. 8 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a cross-sectional view taken along the line BB of FIG. It is sectional drawing which shows the state which the screw is screwed into the screw hole of the joint metal fitting for an arm, and is the sectional view taken along line AA of FIG. It is sectional drawing which shows the state which the screw is screwed into the screw hole of the joint metal fitting for an arm, and is the sectional view taken along line BB of FIG. It is a perspective view which shows the state which the wall washer is attached to the arm pipe attached to the support column through the arm joint metal fittings. It is a perspective view which shows the state which the wall washer is attached to the arm pipe attached to the support column through the arm joint metal fittings. It is a perspective view which shows the state which the wall washer is attached to the arm pipe attached to the support column through the arm joint metal fittings. It is sectional drawing which shows the state which attached the wall washer to the arm pipe attached to the support column through the arm joint metal fittings. It is a perspective view which shows the state which attached the lower joint metal fittings of the arm joint metal fittings used for the pipe connecting device of this invention to the slit of the support column made of a round pipe. It is a perspective view which shows the state which attaches the upper joint metal fitting of the arm joint metal fitting used in the pipe connecting apparatus of this invention to the slit of the support | support which is made of a round pipe. It is a perspective view which shows the state which shows the state which the arm pipe made of a round pipe is inserted into the joint metal fitting for an arm attached to the slit of the support | column which made with a round pipe. It is a perspective view which shows the state which attaches the wall washer to the arm pipe which consists of a round pipe attached through the arm joint metal fitting to the support column which consists of a round pipe. It is a perspective view which shows the state which attaches the wall washer to the arm pipe which consists of a round pipe attached through the arm joint metal fitting to the support column which consists of a round pipe. It is a perspective view which shows the state which the wall washer is attached to the arm pipe attached to the support column through the arm joint metal fittings. It is an exploded perspective view which shows the joint metal fitting for arm which concerns on 2nd Embodiment used in the pipe connecting apparatus of this invention. It is a perspective view which shows the joint metal fitting for arm which concerns on 2nd Embodiment used in the pipe connecting apparatus of this invention. It is a top view which shows the joint metal fitting for arm which concerns on 2nd Embodiment used in the pipe connecting apparatus of this invention. FIG. 25 is a cross-sectional view taken along the line AA of FIG. It is a perspective view which shows the joint metal fitting for arm which concerns on 2nd Embodiment used in the pipe connecting apparatus of this invention. It is a top view which shows the joint metal fitting for arm which concerns on 2nd Embodiment used in the pipe connecting apparatus of this invention. FIG. 28 is a cross-sectional view taken along the line AA of FIG. 28. It is a perspective view which shows the arm pipe used in the 2nd Embodiment of this invention. It is sectional drawing which shows the state which attaches the arm joint metal fitting of the 2nd Embodiment of this invention to an arm pipe. It is sectional drawing which shows the state which attached the joint metal fitting for arm of 2nd Embodiment of this invention to an arm pipe. It is a perspective view which shows the state which attaches the arm pipe which attached the arm joint metal fitting which concerns on 2nd Embodiment of this invention to the slit of a column. It is a perspective view which shows the state which attaches the arm pipe which attached the arm joint metal fitting which concerns on 2nd Embodiment of this invention to the slit of a column. It is a top view which shows the state which attached the arm pipe which attached the arm joint metal fitting which concerns on 2nd Embodiment of this invention to the slit of a column. FIG. 35 is a cross-sectional view taken along the line AA of FIG. 35. FIG. 35 is a cross-sectional view taken along the line BB of FIG. 35. It is sectional drawing which shows the state which the screw is screwed into the screw hole of the joint metal fitting for an arm, and is the sectional view taken along line AA of FIG. 35. It is sectional drawing which shows the state which the screw is screwed into the screw hole of the joint metal fitting for an arm, and is the sectional view taken along line BB of FIG. 35. It is a perspective view which shows the state which attached the arm pipe to the support column via the arm joint metal fittings. It is a cross-sectional view which shows the conventional example. It is a vertical cross-sectional view which shows the conventional example. It is a front view which shows the pulling member of the conventional example.

Embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the explanations are not repeated in order to avoid duplication of explanations.

In the pipe connecting device of the present invention, the arm pipe 7 is attached to a support column 6 provided with slits 61 at equal intervals, and the arm joint metal fitting 2 is engaged with the slit 61 of the support column 6, and the arm joint metal fitting 2 is engaged. The arm pipe 7 is inserted into and attached to the arm pipe 7.

The support column 6 of this embodiment is a so-called double slit pipe in which slits 61 as a plurality of openings are provided side by side on one surface of a square pipe. The support column 6 is installed, for example, from the floor to the ceiling. Then, the arm joint metal fitting 2 is engaged with the slit 61 of the installed support column 6, the arm pipe 7 is inserted, and as will be described later, the arm joint is used from the hole 71 provided in the arm pipe 7 using the screw 8. The arm pipe 7 is fixed to the metal fitting 2. By tightening the screw 8 for fixing, the arm joint metal fitting 2 moves in the vertical direction of the slit 61, is fixed to the slit 61, and the arm pipe 7 is attached to the support column 6. A wall washer 9 is attached to the other end of the arm pipe 7, and the arm pipe 7 is fixed to the wall surface.

As shown in FIGS. 1 and 2, the arm joint fitting 2 includes a lower joint fitting 21, an intermediate plate 22, and an upper joint fitting 23.

The lower joint metal fitting 21 is made of a steel material and has a main body portion 21a and a pair of leg portions 21f bent downward so as to be orthogonal to the main body portion 21a, and the leg portions 21f are forward from the main body portion 21a. It has a protruding portion 21f1 that protrudes. A lateral L-shaped hook 21b that is connected to each of the protruding portions 21f1 that protrudes forward and is inserted into the slit 61 of the support column 6 is provided. An engaging recess 21c opened downward is provided at the base end portion of the hook 21b. The distance between the pair of hooks 21b corresponds to the distance between the slits 61 arranged side by side on the support column 6, and the hooks 21b are inserted into the slits 61 arranged side by side.

Since the size of the engaging recess 21c in the front-rear direction is formed to correspond to the plate thickness of the slit 61 portion of the support column 6, it is formed to be slightly larger than the plate thickness. The engaging recess 21c of the lower joint fitting 21 engages with the lower end of the slit 61 of the support column 6.

Two engaging protrusions 21d are provided on the upper surface of the main body 21a of the lower joint fitting 21. The engaging projection 21d is formed so as to project from the lower surface of the main body 21a and project to the upper surface. The engaging projection 21d engages with the engaging hole 22d provided in the intermediate plate 22 placed on the lower joint fitting 21.

The intermediate plate 22 is made of a rectangular steel material and is provided with two engaging holes 22d and screw holes 22e. The length of the intermediate plate 22 is formed to be the same as the length of the main body portion 21a of the lower joint metal fitting 21.

When the engaging hole 22d of the intermediate plate 22 is aligned with the engaging projection 21d of the lower joint metal fitting 21 and the intermediate plate 22 is placed on the lower joint metal fitting 21, the lower part of the screw hole 22e is the main body 21a. It is configured so that the top surface is located.

The upper joint metal fitting 23 is made of steel and has a main body portion 23a and a pair of leg portions 23f bent upward so as to be orthogonal to the main body portion 23a, and the leg portions 23f project forward from the main body portion 23a. It has a protruding portion 23f1. A horizontal L-shaped hook 23b that is connected to each of the protruding portions 23f1 that protrudes forward and is inserted into the slit 61 of the support column 6 and faces upward is provided. The distance between the pair of hooks 23b corresponds to the distance between the slits 61 arranged side by side on the support column 6, and the hooks 23b are inserted into the slits 61 arranged side by side. Since the size of the engaging recess 21c in the front-rear direction is formed to correspond to the plate thickness of the slit 61 portion of the support column 6, it is formed to be slightly larger than the plate thickness. The engaging recess 23c engages with the upper end of the slit 61 of the support column 6. Further, the length of the main body portion 23a of the upper joint metal fitting 23 is formed to be the same as the length of the main body portion 21a of the lower joint metal fitting 21.

Two engaging protrusions 23d are provided on the lower surface of the main body 23a of the upper joint fitting 23. The engaging protrusion 23d is formed so as to be projected from the upper surface of the main body portion 23a and protrude to the lower surface. The engaging projection 23d engages with the engaging hole 22d provided in the intermediate plate 22 located below the upper joint fitting 23.

The main body 23a of the upper joint metal fitting 23 is provided with an oval hole 23e larger than the screw hole 22e at a position facing the screw hole 22e provided in the intermediate plate 22.

When the engaging projection 23d of the upper joint fitting 23 is engaged with the engaging hole 22d of the intermediate plate 22, the screw hole 22e is located below the hole 23e. As will be described later, when the arm joint metal fitting 2 is attached to the slit 61 and the arm pipe 7 is inserted into the arm joint metal fitting 2, a screw hole 22e appears under the hole 71 provided in the arm pipe 7 through the hole 23e. .. By inserting the screw 8 into the hole 71 of the arm pipe 7 and screwing the screw 8 into the screw hole 22e, the arm pipe 7 is attached to the support column 6 via the arm joint metal fitting 2.

The end side of the arm joint fitting 2 that combines the lower joint fitting 21, the intermediate plate 22, and the upper joint fitting 23 is formed to have a size slightly smaller than the internal height of the arm pipe 7. When the arm pipe 7 is inserted into the arm joint metal fitting 2, the terminal side of the arm joint metal fitting 2 is formed at a height at which it slides into contact with the inner surface of the arm pipe 7. The legs 21f of the lower joint fitting 21 and the legs 23f of the upper joint fitting 23 are formed so as to be slightly tapered in height from the rear end side toward the front. Then, when the screw 8 is tightened, the tip of the screw 8 pushes the upper surface of the main body 21a of the lower joint metal fitting 21 so that the screw 8 can move up and down around the screw 8 portion. The hooks 21b and 23b of the side joint fitting 21 and the upper joint fitting 23 are opened, and the engaging recess 21c of the lower joint fitting 21 and the engaging recess 23c of the upper joint fitting 23 engage with the upper and lower ends of the slit 61 and hold. To do.

As shown in FIGS. 13 and 14, the wall washer 9 attached to the other end of the arm pipe 7 is composed of two members, and the first member 91 is attached to an L-shaped insertion portion 91a and the insertion portion 91a. It is composed of a wall surface contact portion 91b formed at right angles. Similarly, the second member 92 includes an L-shaped insertion portion 92a combined with the L-shaped insertion portion 91a and a wall surface contact portion 92b formed orthogonal to the insertion portion 92a. The L-shaped insertion portions 91a and 92a are provided with screw holes 91c and 92c.

As shown in FIG. 14, when the first member 91 and the second member 92 are combined, the insertion portions 91a and 92a inserted into the arm pipe 7 have a quadrangular shape, and as shown in FIGS. 15 and 16, the insertion portions 91a and 92a have a quadrangular shape. The insertion portions 91a and 92a are inserted into the arm pipe 7, and the wall washer 9 is attached to the arm pipe 7 by the screw 8b. Then, the wall surface contact portions 91b and 92b are brought into contact with the wall surface and fixed to the wall surface with screws.

Next, a method of attaching the arm pipe 7 to the support column 6 using the arm joint fitting 2 according to the first embodiment of the present invention will be described with reference to FIGS. 3 to 12.

First, a method of attaching the arm joint fitting 2 to the slit 61 of the support column 6 will be described with reference to FIGS. 3 to 6. FIG. 3 is a perspective view showing a state in which the lower joint fitting 21 of the arm joint fitting 2 used in the pipe connecting device of the present invention is attached to the slit 61 of the support column 6, and FIG. 4 is a perspective view showing the state in which the pipe connecting device of the present invention is used. FIG. 5 is a perspective view showing a state in which the upper joint metal fitting 23 of the arm joint metal fitting 2 used is attached to the slit 61 of the support column 6, and FIG. 5 shows the upper joint metal fitting 23 of the arm joint metal fitting 2 used in the pipe connecting device of the present invention. A cross-sectional view showing a state of being attached to the slit 61 of the support column 6, FIG. 6 is a cross-sectional view showing a state in which the upper joint metal fitting 23 of the arm joint metal fitting 2 used in the pipe connecting device of the present invention is attached to the slit 61 of the support column 6. Is.

As shown in FIG. 3, the hook 21b of the lower joint fitting 21 of the arm joint fitting 2 is inserted into the slit 61 of the support column 6, and the engaging recess 21c of the lower joint fitting 21 is engaged with the lower end of the slit 61. .. When the engaging recess 21c of the lower joint fitting 21 and the lower end of the slit 61 are engaged, the lower joint fitting 21 is attached in a state orthogonal to the support column 6 as shown in FIG.

Then, the engaging hole 22d of the intermediate plate 22 is aligned with the engaging projection 21d of the lower joint metal fitting 21, and the intermediate plate 22 is placed on the lower joint metal fitting 21. The upper surface of the main body 21a of the lower joint fitting 21 is located below the screw hole 22e of the intermediate plate 22 (see FIG. 5).

Subsequently, as shown in FIGS. 4 and 5, the hook 23b of the upper joint fitting 23 of the arm joint fitting 2 is inserted into the slit 61 of the support column 6 to which the lower joint fitting 21 is attached from an oblique direction, and the hook 23b of the upper joint fitting 23 is inserted. The engaging recess 23c of the joint metal fitting 23 is engaged with the upper end of the slit 61. Then, the upper joint metal fitting 23 is rotated toward the intermediate plate 22, the engaging protrusion 23d of the upper joint metal fitting 23 is fitted into the engaging hole 22d of the intermediate plate 22, and the upper joint metal fitting 23 is placed on the intermediate plate 22. To do. As shown in FIG. 6, when the upper joint metal fitting 23 is engaged with the slit 61, it is attached in a state orthogonal to the support column 6.

As described above, the terminal side of the arm joint fitting 2 that combines the lower joint fitting 21, the intermediate plate 22, and the upper joint fitting 23 is formed to have a size slightly smaller than the internal height of the arm pipe 7, and the lower joint is formed. The heights of the leg portion 21f of the metal fitting 21 and the leg portion 23f of the upper joint metal fitting 23 are slightly tapered from the rear end side toward the front.

In this way, after the arm joint fitting 2 is attached to the slit 61 of the support column 6, the arm pipe 7 is inserted from the rear end of the arm joint fitting 2 as shown in FIG. The end side of the arm joint metal fitting 2 and the inner surface of the arm pipe 7 are slidably inserted. Then, the arm pipe 7 is inserted from the oval hole 23e to the position where the screw hole 22e of the intermediate plate 22 faces under the hole 71 provided in the arm pipe 7.

As shown in FIGS. 8 to 12, the screw 8 is screwed into the screw hole 22e. 8 is a top view showing a state in which the arm pipe 7 is inserted from the rear end of the arm joint metal fitting 2, FIG. 9 is a sectional view taken along line AA of FIG. 8, and FIG. 10 is a sectional view taken along line BB of FIG. is there. 11 is a cross-sectional view showing a state in which the screw 8 is screwed into the screw hole 22e, FIG. 11 is a cross-sectional view taken along the line AA of FIG. 8, and FIG. 12 is a cross-sectional view showing a state in which the screw 8 is screwed into the screw hole 22e. Yes, it is a cross-sectional view taken along the line AA of FIG.

A wrench hole 81 into which a hexagon wrench is fitted is provided in the head of the screw 8 to be screwed into the screw hole 22e, and a hexagon wrench (not shown) is fitted into the wrench hole 81 to turn the screw 8. As shown in FIGS. 9 and 10, the arm pipe 7 is inserted from the oval hole 23e to the position where the screw hole 22e of the intermediate plate 22 faces under the hole 71 provided in the arm pipe 7. Then, the screw 8 is inserted through the hole 71 of the arm pipe 7.

As shown in FIGS. 11 and 12, the screw 8 is screwed into the screw hole 22e. Then, when a hexagon wrench (not shown) is fitted into the wrench hole 81 and the screw 8 is screwed in, the tip of the screw 8 comes into contact with the upper portion of the main body portion 21a of the lower joint metal fitting 21. When the screw 8 is further screwed in this state, as shown by the arrows in FIGS. 11 and 12, the upper joint metal fitting 23 is on the upper side and the lower joint metal fitting 21 is on the lower side. After moving by the amount, the hook 21b opens downward, the hook 23b opens upward, the engaging recesses 21c and 23c are held at the upper and lower ends of the slit 61, and the arm pipe 7 is attached to the support column 6 via the arm joint fitting 2. It is firmly held in. In this way, the arm pipe 7 can be attached to the slit 61 of the support column 6.

As described above, the pipe connecting device of the present invention can easily form each member without using welding or the like, and after engaging the hooks 21b and 23b of the arm joint fitting 2 with the slit 61 of the support column 6, The arm pipe 7 provided with the hole 71 can be attached to the slit 61 of the support column 6 by a simple operation of inserting the arm pipe 7 into the arm joint metal fitting 2 and tightening with the screw 8.

When the arm pipe 7 is attached to the wall surface, the wall washer 9 is attached. As shown in FIGS. 13 and 14, the first member 91 and the second member 92 of the wall washer 9 are combined. As shown in FIGS. 15 and 16, the insertion portions 91a and 92a of the wall washer 9 are inserted into the arm pipe 7, and the wall washer 9 is attached to the arm pipe 7 by the screw 8b. Then, the wall surface contact portions 91b and 92b are brought into contact with the wall surface and fixed to the wall surface with screws.

Next, a case where the arm pipe 7a of the round pipe is attached to the support 6a of the round pipe by using the above-mentioned arm joint metal fitting 2 will be described. The support column 6a of this embodiment is a so-called double slit pipe in which a plurality of slits 61 are provided side by side on the peripheral surface of the round pipe. The support column 6a is installed from the floor to the ceiling, for example.

The end side of the arm joint metal fitting 2 that combines the lower joint metal fitting 21, the intermediate plate 22, and the upper joint metal fitting 23 is formed so as to be in sliding contact with the inner peripheral surface of the arm pipe 7a.

As shown in FIG. 17, the hook 21b of the lower joint fitting 21 of the arm joint fitting 2 is inserted into the slit 61 of the support column 6a, and the engaging recess 21c of the lower joint fitting 21 is engaged with the lower end of the slit 61. .. When the engaging recess 21c of the lower joint fitting 21 and the lower end of the slit 61 are engaged, the lower joint fitting 21 is attached in a state orthogonal to the support column 6a.

Then, the engaging hole 22d of the intermediate plate 22 is aligned with the engaging projection 21d of the lower joint metal fitting 21, and the intermediate plate 22 is placed on the lower joint metal fitting 21. The upper surface of the main body 21a of the lower joint fitting 21 is located below the screw hole 22e of the intermediate plate 22.

Subsequently, as shown in FIG. 18, the hook 23b of the upper joint fitting 23 of the arm joint fitting 2 is inserted into the slit 61 of the support column 6a to which the lower joint fitting 21 is attached from an oblique direction, and the upper joint fitting 23 is inserted. The engaging recess 23c of the above is engaged with the upper end of the slit 61. Then, the upper joint metal fitting 23 is rotated toward the intermediate plate 22, the engaging protrusion 23d of the upper joint metal fitting 23 is fitted into the engaging hole 22d of the intermediate plate 22, and the upper joint metal fitting 23 is placed on the intermediate plate 22. To do. When the upper joint metal fitting 23 is engaged with the slit 61, it is attached in a state orthogonal to the support column 6a.

As described above, the terminal side of the arm joint metal fitting 2 that combines the lower joint metal fitting 21, the intermediate plate 22, and the upper joint metal fitting 23 is formed so as to abut on the inner peripheral surface of the arm pipe 7a, and is formed on the lower side. The heights of the leg portion 21f of the joint metal fitting 21 and the leg portion 23f of the upper joint metal fitting 23 are slightly tapered from the rear end side toward the front.

In this way, after the arm joint fitting 2 is attached to the slit 61 of the support column 6a, the arm pipe 7a made of a round pipe is inserted from the rear end of the arm joint fitting 2 as shown in FIG. The end side of the arm joint metal fitting 2 and the inner surface of the arm pipe 7a are slidably inserted. Then, the arm pipe 7a is inserted from the oval hole 23e to the position where the screw hole 22e of the intermediate plate 22 faces under the hole 71 provided in the arm pipe 7a.

The arm pipe 7a is inserted from the rear end of the arm joint metal fitting 2, the screw 8 is inserted into the hole 71 of the arm pipe 7, and the screw 8 is screwed into the screw hole 22e. Then, as the screw 8 is screwed in, the tip of the screw 8 comes into contact with the upper part of the main body of the lower joint metal fitting 21. When the screw 8 is further screwed in this state, the upper joint metal fitting 23 moves upward and the lower joint metal fitting 21 moves downward by the taper of each leg, the hook 21b opens downward, and the hook 23b opens. It opens upward, and the engaging recesses 21c and 23c are firmly held at the upper and lower ends of the slit 61, and the arm pipe 7 is firmly held by the support column 6a via the arm joint fitting 2.

In this way, the arm pipe 7a can be attached to the slit 61 of the support column 6.

When the arm pipe 7 is attached to the wall surface, the wall washer 9 is attached. As shown in FIGS. 20 and 21, the first member 91 and the second member 92 of the wall washer 9 are combined. As shown in FIG. 22, the insertion portions 91a and 92a of the wall washer 9 are inserted into the arm pipe 7, and the wall washer 9 is attached to the arm pipe 7 by the screw 8b. Then, the wall surface contact portions 91b and 92b are brought into contact with the wall surface and fixed to the wall surface with screws.

In the above-described embodiment, the arm joint metal fitting 2 is attached to the support column 6 and 6a provided with slits 61 in parallel, but the pair of upper and lower hooks 21b and 23b of the arm joint metal fitting 2 can be engaged with each other. The arm pipes 7 and 7a can be attached not only to slits but also to columns provided with openings such as circular holes by using the arm joint fitting 2 of the present invention.

Next, the arm joint fitting 2a according to the second embodiment of the present invention will be described with reference to FIGS. 23 to 40.

The arm joint metal fitting 2a according to the second embodiment is previously attached to the arm pipe 7b, and the arm joint metal fitting 2a attached to the arm pipe 7b is engaged with the slit 61 of the support column 6 to engage the arm pipe 7b. Is to be attached.

As shown in FIGS. 23 to 29, the arm joint fitting 2a according to the second embodiment includes a lower joint fitting 210, an intermediate plate 220, and an upper joint fitting 230.

The lower joint metal fitting 210 is made of steel and has a main body 210a and a pair of legs 210f bent downward so as to be orthogonal to the main body 210a, and the leg 210f is forward from the main body 210a. It has a protruding portion 210f1 that protrudes. A lateral L-shaped hook 210b that is connected to each of the protruding portions 210f1 that protrudes forward and is inserted into the slit 61 of the support column 6 is provided. The distance between the pair of hooks 210b corresponds to the distance between the slits 61 arranged side by side on the support column 6, and the hooks 210b are inserted into the slits 61 arranged side by side. Since the size of the engaging recess 210c in the front-rear direction is formed to correspond to the plate thickness of the slit 61 portion of the support column 6, it is formed to be slightly larger than the plate thickness. The engaging recess 210c engages with the lower end of the slit 61 of the support column 6.

An engaging pedestal 210h is provided behind the main body 210a of the lower joint fitting 210, and a gate 210j having an opening 210i into which the rear end protruding portion 230i of the upper joint fitting 230 is inserted is formed in the engaging pedestal 210h. Has been done. Opening 210i is formed between the engagement seat 210h and hilus 210 j.

Two engaging protrusions 210g and 210m are provided on the upper surface of the main body 210a of the lower joint metal fitting 210. The engaging protrusions 210g and 210m are formed so as to be projected from the lower surface of the main body portion 210a and protrude to the upper surface. The engaging protrusion 210g engages with the notch 220g provided in the intermediate plate 220 placed on the lower joint fitting 210, and the engaging protrusion 210m has a long hole 220m provided in the intermediate plate 220. Engage.

A claw portion 210n that engages with the notch portion 72 provided in the arm pipe 7b is provided below the front of the leg portion 210f of the lower joint metal fitting 210, and is provided between the claw portion 210n and the claw portion 210n. An engaging recess 210k formed slightly larger than the plate thickness of the arm pipe 7b is provided.

As will be described later, the arm joint fitting 2a, which is a combination of the lower joint fitting 210, the intermediate plate 220, and the upper joint fitting 230, is inserted into the arm pipe 7b, and the claw portion 210n of the lower joint fitting 210 is inserted into the arm pipe 7b. Along the lower surface 73, the engaging recess 210k is engaged with the notch 72, and the arm joint metal fitting 2a is attached to the arm pipe 7.

The intermediate plate 220 is made of a rectangular steel material, and a notch 220 g is provided on the front side of the intermediate plate 220. A screw hole 220e is provided on the rear side of the notch portion 2 20 g. An engaging hole 220d is provided on the rear side of the screw hole 220e. An elongated hole 220 m is provided behind the engaging hole 220 d. The length of the intermediate plate 220 is formed to be the same as the length of the main body portion 210a of the lower joint metal fitting 210.

The engaging protrusion 210g of the lower joint fitting 210 is engaged with the notch 220g of the intermediate plate 220, the engaging protrusion 210m of the lower joint fitting 210 is engaged with the elongated hole 220m, and the end of the notch 220g. When the intermediate plate 220 is placed on the lower joint metal fitting 210 with the engaging protrusion 210g in contact with the screw hole 220e, the upper surface of the main body 210a is positioned under the screw hole 220e.

The upper joint fitting 230 is made of steel and has a main body 230a and a pair of legs 230f bent upward so as to be orthogonal to the main body 230a, and the legs 230f project forward from the main body 230a. It has a protruding portion 230f1. A horizontal L-shaped hook 230b that is connected to each of the protruding portions 230f1 that protrudes forward and is inserted into the slit 61 of the support column 6 and faces upward is provided. An engaging recess 230c opened upward is provided at the base end portion of the hook 230b. The distance between the pair of hooks 230b corresponds to the distance between the slits 61 arranged side by side on the support column 6, and the hooks 230b are inserted into the slits 61 arranged side by side. Since the size of the engaging recess 230c in the front-rear direction is formed to correspond to the plate thickness of the slit 61 portion of the support column 6, it is formed to be slightly larger than the plate thickness. The engaging recess 230c engages with the upper end of the slit 61 of the support column 6.

Engagement protrusions 230d and 230g are provided on the lower surface of the main body 230a of the upper joint fitting 230. The engaging protrusions 230d and 230g are formed so as to be projected from the upper surface of the main body portion 230a and protrude to the lower surface. The engaging protrusion 23d engages with the engaging hole 220d provided in the intermediate plate 220 located below the upper joint fitting 230. The engaging protrusion 230g engages with a notch 220g provided in the intermediate plate 220 located below the upper joint fitting 230.

The main body 230a of the upper joint metal fitting 230 is provided with a hole 230e at a position facing the screw hole 220e provided in the intermediate plate 220.

The length of the main body 230a of the upper joint fitting 230 is formed to be the same as the length of the intermediate plate 220a.

When the engaging projection 230d of the upper joint fitting 230 is engaged with the engaging hole 210d of the intermediate plate 220, the screw hole 220e is located below the hole 230e. The engaging protrusion 230g engages with the notch 220g.

A rear end protruding portion 230i is formed at the rear portion of the main body portion 230a of the upper joint metal fitting 230, and the coil spring 250 is mounted on the rear end protruding portion 230i.

A mountain portion 230q projecting upward is provided on the terminal side of the leg portion 230f of the upper joint metal fitting 230. The mountain portion 230q is formed in an arc shape from the flat portion at the top toward the front, and is connected to the upper end of the leg portion 230f.

The intermediate plate 220 is placed on the lower joint fitting 210, and the rear end protruding portion 230i of the upper joint fitting 230 to which the coil spring 250 is mounted is inserted into the opening 210i of the lower joint fitting 210.

The end side of the arm joint metal fitting 2a that combines the lower joint metal fitting 210, the intermediate plate 220, and the upper joint metal fitting 230, that is, the lower end of the leg portion 210f of the lower joint metal fitting 210 and the mountain portion 230q of the upper joint metal fitting 230. The upper end is formed to have a size slightly smaller than the internal height of the arm pipe 7b. When the arm pipe 7b is inserted into the arm joint fitting 2a, the lower end of the leg 210f of the lower joint fitting 210 of the arm joint fitting 2a and the upper end of the mountain portion 230q of the upper joint fitting 230 are on the inner surface of the arm pipe 7b. It is formed in a size so that it slides in contact with each other. A gap is formed between the leg 210f of the lower joint fitting 210 and the leg 230f of the upper joint fitting 23 with the inner surface of the arm pipe 7b.

Then, when the screw 8 is tightened, the hooks 210b and 230b of the lower joint metal fitting 210 and the upper joint metal fitting 230 are opened, and the engaging recess 210c of the lower joint metal fitting 210 and the engaging recess 230c of the upper joint metal fitting 230 are slit 61. It is configured so that it can be moved up and down around the screw 8 portion so that it can be engaged with the upper and lower ends and held.

The intermediate plate 220 is placed on the lower joint metal fitting 210, and the upper joint metal fitting 230 is further placed on the intermediate plate 220, and these three members are mounted by using a U-shaped mounting member 240 made of a leaf spring. Hold it in place and fix it.

The mounting member 240 includes a lower plate portion 240a that abuts on the lower surface of the main body portion 210a of the lower joint fitting 210, an upper plate portion 240b that abuts on the upper surface of the main body portion 230a of the upper joint fitting 230, and a lower plate portion 240a and an upper plate. It is composed of a side plate portion 240c that connects the portions 240b. The width of the side plate portion 240c is formed so as to enter the cutout portion 220g of the intermediate plate 220. The lower plate portion 240a is provided with a protrusion 240d that enters the recess 210p formed on the lower side of the engagement protrusion 210g of the lower joint metal fitting 210.

The lower joint metal fitting 210, the intermediate plate 220, and the upper joint metal fitting 230 are combined, the mounting member 240 is inserted between the hooks 210b and 230b, and the side plate portion 240c of the mounting member 240 is inserted into the notch 220g of the intermediate plate 220. When the side plate portion 240c is pushed to a position where it comes into contact with the main body portion 210a of the lower joint metal fitting 210 and the main body portion 230a of the upper joint metal fitting 230, the protrusion 240d of the lower plate portion 240a is inserted into the concave portion 210p of the lower joint metal fitting 210. The three members are fixed by the mounting member 240.

In the arm joint fitting 2a, the intermediate plate 220 and the upper joint fitting 230 move on the opposite side of the gate 210j, that is, toward the tip of the hook 210b of the lower joint fitting 210 due to the urging force of the coil spring 250. The intermediate plate 220 and the upper joint fitting 230 are positioned at a position where the elongated hole 220m of the intermediate plate 220 and the protrusion 210m of the lower joint fitting 210 are in contact with each other. At this time, the screw hole 220e of the intermediate plate 220 is located below the hole 230e of the upper joint metal fitting 230. Further, both engaging protrusions 210g, so that the engaging protrusion 210g of the lower joint fitting 210 and the protrusion 230g of the upper joint fitting 230 are located at the same position of the notch 220g of the intermediate plate 220 so as not to overlap each other. The height of 230g is fixed.

As will be described later, when the upper joint metal fitting 230 comes into contact with the wall surface of the support column 6, the coil spring 250 contracts against the urging force of the coil spring 250, and the upper joint metal fitting 230 moves in the direction of the gate portion 210j. capable that it is supported on the lower joint metal fitting 210.

The contracted state of the coil spring 250 will be described with reference to FIGS. 27 to 29. When the tip of the hook 230b of the upper joint metal fitting 230 comes into contact with the wall surface of the support column 6, the upper joint metal fitting 230 moves away from the wall surface of the support column 6 against the urging force of the coil spring 250. The upper joint metal fitting 230 and the intermediate plate 220 are engaged with the engaging protrusion 230d and the engaging hole 220d, and the lower joint metal fitting 210 and the intermediate plate 220 have a protrusion 210 g, a notch 220 g, and an engaging protrusion 210 m. It is engaged with a long hole 220 m. Therefore, the upper joint metal fitting 230 and the intermediate plate 220 move integrally with the lower joint metal fitting 210. That is, the intermediate plate 220 and the upper joint fitting 230 move by being guided by the engaging projections 210g and 210m of the lower joint fitting 210 that engages with the notch 220g of the intermediate plate 220 and the elongated hole 220m.

Then, when there is nothing that comes into contact with the hook 230b of the upper joint metal fitting 230, the upper joint metal fitting 230 and the intermediate plate 220 move forward due to the urging force of the coil spring 250, and are in the states shown in FIGS. 24 to 26. ..

Next, a method of attaching the arm pipe 7b to the slit 61 of the support column 6 will be described using the arm joint metal fitting 2a according to the second embodiment.

As shown in FIG. 30, the arm pipe 7b is made of a square pipe, and notches 72 and 72 for attaching the arm joint metal fittings 2a are provided on the lower surface thereof. A hole 71 into which the screw 8 is inserted is provided on the upper surface of the arm pipe 7b.

The lower joint metal fitting 210, the intermediate plate 220, and the upper joint metal fitting 230 are combined, the mounting member 240 is inserted between the hooks 210b and 230b, and the protrusion 240d of the lower plate portion 240a of the mounting member 240 is used as the lower joint metal fitting. The joint metal fitting 2a for the arm is prepared by inserting the concave portion 210p of the 210 into the recess 210p and fixing the three members with the mounting member 240.

Then, as shown in FIGS. 31 and 32, the arm joint fitting 2a is inserted into the arm pipe 7b from the rear end portion of the arm joint fitting 2a through the opening provided with the cutout portions 72, 72 of the arm pipe 7b. Insert in. The claw portion 210n of the lower joint metal fitting 210 is aligned with the lower surface 73 of the arm pipe 7b, the engaging recess 210k is engaged with the notch portion 72, and the arm joint metal fitting 2a is attached to the arm pipe 7b.

As shown in FIG. 33, the arm pipe 7b to which the arm joint fitting 2a is attached is inserted into the slit 61 of the support column 6.

As shown in FIGS. 36 and 34, the hook 210b of the lower joint fitting 210 is inserted into the slit 61. At this time, the hook 230b of the upper joint metal fitting 230 comes into contact with the wall surface 62 of the support column 6. As shown in FIGS. 36 and 37, the hook 230b of the upper joint fitting 230 abuts on the wall surface 62 of the support column 6. When the tip of the hook 230b of the upper joint metal fitting 230 comes into contact with the wall surface 62 of the support column 6, the upper joint metal fitting 230 moves away from the wall surface 62 of the support column 6 against the urging force of the coil spring 250, and the arm pipe. The hook 230b of the upper joint metal fitting 230 enters the 7b. At this time, the upper joint metal fitting 230 and the intermediate plate 220 move integrally with the lower joint metal fitting 210.

As shown in FIGS. 38 and 39, the arm pipe 7b is moved downward, and the engaging recess 210c of the hook 210b of the lower joint fitting 210 is engaged with the lower end of the slit 61. Due to the downward movement of the arm pipe 7b, the hook 230b of the upper joint metal fitting 230 faces the slit 61 from the wall surface 62 of the support column 6. When there is nothing that comes into contact with the hook 230b of the upper joint fitting 230, the urging force of the coil spring 250 causes the upper joint fitting 230 and the intermediate plate 220 to move forward, and the hook 230b of the upper joint fitting 230 is placed in the slit 61. The engaging recess 230c is located below the upper end of the slit 61.

Then, the screw 8 is inserted into the hole 71 of the arm pipe 7b, and the screw is screwed into the screw hole 220e. Then, as the screw 8 is screwed in, the tip of the screw 8 comes into contact with the upper portion of the main body portion 210a of the lower joint metal fitting 210. When the screw 8 is further screwed in this state, the upper joint metal fitting 230 moves upward, the engaging recesses 21c and 23c are held in the upper and lower ends of the slit 61, and the arm pipe 7b passes through the arm joint metal fitting 2a. Is held by the support column 6.

In this way, the arm pipe 7b can be attached to the slit 61 of the support column 6.

When the arm pipe 7b is attached to the wall surface, the wall washer 9 shown in FIGS. 13 and 14 is attached. The insertion portions 91a and 92a of the wall washer 9 are inserted into the arm pipe 7, and the wall washer 9 is attached to the arm pipe 7 by the screw 8b. Then, the wall surface contact portions 91b and 92b are brought into contact with the wall surface and fixed to the wall surface with screws.

In the second embodiment described above, the arm joint fitting 2a is attached to the one provided with the slit 61 parallel to the support column 6, but the pair of upper and lower hooks 210b and 230b of the arm joint fitting 2a are engaged with each other. If possible, the arm pipe 7b can be attached not only to a slit but also to a support column provided with an opening such as a circular hole by using the arm joint metal fitting 2a of the present invention.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the embodiment described above, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

2, 2a: Arm joint metal fittings 6, 6a: Support columns 7, 7a, 7b: Arm pipes 8, 8b: Screws 9: Wall seat metal 20a: Main body 20k: Engagement recess 21: Lower joint metal fittings 21a: Main body 21b : Hook 21c: Engagement recess 21d: Engagement protrusion 21f: Leg 21f1: Protrusion 22: Intermediate plate 22d: Engagement hole 22e: Screw hole 23: Upper joint metal fitting 23a: Main body 23b: Hook 23c: Engagement recess 23d: Engagement protrusion 23e: Hole 23f: Leg 23f1: Protrusion 61: Slit 62: Wall surface 71: Hole 72: Notch 73: Bottom surface 81: Wrench hole 91: First member 91a: Insertion 91b: Wall surface Contact portion 91c: Screw hole 92: Second member 92a: Insertion portion 92b: Wall surface contact portion 92c: Screw hole 210: Lower joint metal fitting 210a: Main body 210b: Hook 210c: Engagement recess 210d: Engagement hole 210f: Leg 210f1: Projection 210g: Engagement protrusion 210h: Engagement pedestal 210i: Opening 210j: Gate 210k: Engagement recess 210m: Engagement protrusion 210n: Claw 210p: Recess 220: Intermediate plate 220d: Engagement Joint hole 220e: Screw hole 220g: Notch 220m: Long hole 230: Upper joint metal fitting 230a: Main body 230b: Hook 230c: Engagement recess 230d: Engagement protrusion 230e: Hole 230f: Leg 230f1: Protruding part 230g: Engagement protrusion 230i: Rear end protrusion 230q: Mountain part 240: Mounting member 240a: Lower plate part 240b: Upper plate part 240c: Side plate part 240d: Protrusion 250: Coil spring 290q: Mountain part

Claims (14)

An arm joint metal fitting is engaged with an opening provided in a support column made of a pipe, and this arm joint metal fitting is inserted into the arm pipe, and the arm pipe is attached to the support column via the arm joint metal fitting. There,
The arm joint fitting includes a lower joint fitting, an intermediate plate that engages with the lower joint fitting, and an upper joint fitting that engages with the intermediate plate.
The lower joint fitting has a downward hook inserted into the opening of the support column, a downwardly open engaging recess that engages with the opening, and an engagement that engages with the intermediate plate. With protrusions
The upper joint fitting has an upward hook inserted into the opening of the support column, an engaging recess opened upward to engage with the opening, and an engaging protrusion engaging with the intermediate plate. And a hole through which the screw is inserted
Said intermediate plate, together with the engagement hole is provided for engaging the engaging protrusion of the engagement projection and the upper joint metal fitting of the lower joint metal fitting, screw holes at positions corresponding to the holes of the upper joint metal fitting Is provided,
The arm pipe is provided with a hole through which a screw is inserted.
A screw is inserted through the hole of the arm pipe into which the arm joint fitting is inserted, the screw is screwed into the screw hole of the intermediate plate, the screw is brought into contact with the lower joint fitting, and the lower joint fitting and the upper side are brought into contact with each other. The hook of the joint metal fitting is moved so that the engaging recess of the lower joint metal fitting and the engaging recess of the upper joint metal fitting are firmly held in the opening of the column, and the arm pipe is attached to the column via the arm joint metal fitting. A pipe connecting device characterized by being attached. The pipe connecting device according to claim 1, wherein the opening of the support column is a slit provided side by side on one surface of the support column. The lower joint metal fitting is inserted into a main body portion, a pair of leg portions bent downward so as to be orthogonal to the main body portion, and a slit of the support column provided in connection with the leg portions. It has a hook and the engaging recess provided at the base end of the hook.
The upper joint metal fitting includes a main body portion, a pair of leg portions bent upward so as to be orthogonal to the main body portion, and a hook inserted into a slit of the support column provided in connection with the leg portions. The pipe connecting device according to claim 2, further comprising the engaging recess provided at the base end portion of the hook. Two engaging protrusions are provided on the upper surface of the main body of the lower joint fitting, and two engaging protrusions are provided on the lower surface of the main body of the upper joint fitting, and the intermediate plate is provided. 3. The third aspect of the invention is provided with two engaging holes for engaging the two engaging protrusions of the lower joint fitting and the two engaging protrusions of the upper joint fitting. The pipe connecting device according to. Length of the body portion of the body portion of the lower joint metal fitting the upper joint metal fitting is formed in the same length, said intermediate plate is formed in a rectangular shape, the length of said intermediate plate, the lower joint metal fitting pipe coupling according to claim 3 or 4, characterized in that the formed the same length as the main body portion and the length of the body portion of the upper side joint bracket. The combined said engagement holes of said intermediate plate to said engaging projection of the lower joint metal fitting and placing the intermediate plate on said lower joint metal fitting, under the screw hole, the lower joint said body portion upper surface is positioned in the fitting, the pipe coupling device according to any one of claims 3 to 5, wherein the screw is screwed into the screw holes, characterized in that contact with the upper face of the main body portion. The height of the end side of the arm joint metal fitting that combines the lower joint metal fitting, the intermediate plate, and the upper joint metal fitting is formed so as to be in sliding contact with the inner surface of the arm pipe, and the leg of the lower joint metal fitting. The pipe according to any one of claims 3 to 6, wherein the portion and the leg portion of the upper joint metal fitting are formed so as to have a tapered height from the rear end portion side toward the front. Coupling device. The arm pipe is provided with a notch on the lower surface.
The lower joint metal fitting includes a main body portion, a pair of leg portions bent downward so as to be orthogonal to the main body portion, and the hook which is connected to the leg portions and inserted into the slit of the support column. The engaging recess provided at the base end of the hook, the engaging pedestal provided behind the main body, the gate provided at the engaging pedestal, and the gate and the engaging pedestal. It has an opening provided between the two and a claw portion that engages with the notch portion of the arm pipe.
The upper joint metal fitting includes a main body portion, a pair of leg portions bent upward so as to be orthogonal to the main body portion, the hook connected to the leg portion and inserted into the slit of the support column, and the hook. It has the engaging recess provided at the base end portion of the above, and the rear end protruding portion provided behind the main body portion and inserted into the opening of the lower joint metal fitting.
A claim characterized in that a coil spring is attached to the rear end protruding portion, the rear end protruding portion is inserted into the opening, and the upper joint fitting is urged forward by the urging force of the coil spring. Item 2. The pipe connecting device according to item 2. The intermediate plate is formed in a rectangular shape, a notch is provided on the front side of the intermediate plate , a screw hole is provided on the rear side of the notch, and an engaging hole is provided on the rear side of the screw hole. provided, elongated hole is provided on the rear side of the engaging hole,
On the upper surface of the main body portion of the lower joint metal fitting, two engaging protrusions formed so as to be projected from the lower surface of the main body portion and protrude to the upper surface are provided, and one engaging portion engages with the notch portion. The other engaging protrusion engages with the slot and
Two engaging protrusions are provided on the lower surface of the main body of the upper joint fitting, one engaging portion engages with the notch portion, and the other engaging projection engages with the engaging hole.
The pipe connecting device according to claim 8, wherein the intermediate plate and the upper joint fitting are integrally movably supported with respect to the lower joint fitting. A mountain portion protruding upward is provided on the terminal side of the leg portion of the upper joint metal fitting.
8. The present invention is characterized in that the lower end of the leg portion of the lower joint metal fitting and the upper end of the mountain portion of the upper joint metal fitting are formed so as to be in sliding contact with the inner surface of the arm pipe. 9. The pipe connecting device according to 9. Placing the intermediate plate on said lower joint metal fitting on the said upper joint metal fitting is placed on the intermediate plate, sandwiched with a U-shaped mounting member made of three members of a leaf spring The pipe connecting device according to any one of claims 8 to 10, wherein the pipe connecting device is fixed. The arm joint fitting is inserted into the arm pipe, the claw portion of the lower joint fitting is engaged with the notch portion of the arm pipe, and the arm joint fitting is attached to the arm pipe. The pipe connecting device according to any one of claims 8 to 11. When the upper joint metal fitting and the intermediate plate are movably supported by the lower joint metal fitting in a direction away from the wall surface of the support column, and the upper joint metal fitting comes into contact with the wall surface of the support column, the urging force of the coil spring against, the upper joint bracket and to move the direction of the intermediate plate moves away from the wall surface of said post, a hook of the upper joint bracket enters into the arm pipe,
When facing the slit of the hook is the strut of the upper joint bracket, the biasing force of the coil spring, the intermediate plate and the upper joint bracket moves forward, hook the upper joint bracket enters into the slit, The pipe connecting device according to claim 11, wherein the engaging recess is located below the upper end of the slit. A screw is inserted into the hole of the arm pipe, the screw is screwed into the screw hole of the intermediate plate, the upper joint metal fitting is moved upward, and the engaging recess of the lower joint metal fitting and the upper joint metal fitting are at the end of the slit. The pipe connecting device according to claim 12, wherein the arm pipe is attached to a support column via the arm joint fitting.

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