JPS639222Y2 - - Google Patents

Description

[Detailed description of the invention] (Prior art) Conventionally, in order to expose the tip of a buried electrical conduit from a concrete wall, a hole was made in the curtain plate that forms the ceiling surface, and the tip of the curved electrical conduit was inserted into the hole. The curtain plate is inserted, concrete is poured, and the curtain plate is removed after the concrete has hardened, but with this method, many holes must be drilled in the curtain plate, making repair work extremely troublesome. Therefore, as shown in FIG. 1, a long semi-cylindrical end protector 2 is placed over the tip of the conduit 1, and the curtain plate is removed after the concrete hardens.
However, in this case, the electric conduit 1, which is made of steel and is quite hard, must be bent twice at the portions 1a and 1b to form an S-shape, which is very troublesome. This is especially true at sites with poor footing. The reason for having to bend it twice is that it is necessary to separate the conduit 1 from the curtain plate 7 in order to pipe the conduit 1 to the concrete box on the curtain plate 7, and the conventional terminal protector 2 is long. This is due to circumstances such as its long semi-cylindrical shape.

Therefore, recently, the present inventor has provided a terminal protector 3 shown in FIGS. 2 and 3 in order to eliminate the troublesome bending of the conduit only once. As shown in FIG. 3, the front wall 4 and the upper wall 5 of this device have a vertical cross-sectional shape, and the front wall 4 has an insertion hole 6. In such a terminal protector 3, the tip of the electric conduit 1 is inserted through the insertion hole 6, and fresh concrete is poured while the terminal protector 3 is attached to the curtain plate 7. After the concrete has hardened, the curtain plate 7 is removed, and the tip of the electric conduit 1 is moved in the direction of inclination, that is, in the direction of arrow A, as shown in FIG. 4, and is removed from the concrete wall 17.

However, in this case, the inclination angle θ at the tip of the conduit 1 is small, and if L ₁ > L ₂ as shown in FIG. Another problem arises. Since conduit bending is carried out manually at construction sites where the angle of inclination cannot be precisely set, the above-mentioned problem occurs quite frequently. Furthermore, if the inclination angle θ of the conduit 1 is small, the lower end of the terminal protector 3 may lift up, resulting in a problem that the protector 3 cannot be securely attached to the curtain plate 7. Even if it can be installed, there will be a gap between the protector 3 and the curtain plate 7, through which the concrete particles will enter, and furthermore, the particles will enter the conduit 1 and clog it, causing the conduit to become damaged. 1 may be rendered unusable.

(Purpose) The present invention was made in view of the above-mentioned prior art, and its purpose is to facilitate the removal of the terminal protector even when the inclination angle of the conduit is small;
Another objective is to securely attach the terminal protector to the curtain plate.

(Structure) (Effects) A feature of the present invention is that a bellows is integrally provided around the insertion hole in the front wall of the terminal protector, and the bellows absorbs differences in the inclination angle of the conduit. That is, in the present invention, the portions of the front wall and the top wall having the insertion holes are inclined in a substantially U-shaped longitudinal section, and the tip of the electrical conduit, which is bent and inclined at a predetermined angle, is inserted into the interior through the insertion hole. A terminal protector made of plastic, for example, which is buried in concrete while being inserted into the conduit, and is pulled out from the concrete wall along the length of the tip of the conduit. extending outward or inward,
A bellows is integrally provided around the cylindrical body.

Line 5 and Figure 7 are the first embodiment of the invention, Figure 8 is the second embodiment of the invention, and Line 9 is the second embodiment of the invention.
The figure shows a third embodiment of the present invention. The present invention will be explained below according to each embodiment.

Reference numeral 11 denotes a front wall of the terminal protector 12, which has an insertion hole 13. The insertion hole 13 shown in FIGS. 5 and 9 has a cylindrical shape extending outward. The insertion hole 13 shown in FIG. 8 has a cylindrical shape extending inward. 14 is a top wall of the terminal protector 12. As is clear from the drawings, the front wall 11 and the top wall 14 are inclined in a substantially U-shaped longitudinal section. The front wall 11 and the top wall 14 intersect at a right angle or an obtuse angle, and the top wall 14 has an arcuate shape as shown in FIG.

Reference numeral 15 denotes a bellows that is integrally provided around the insertion hole 13 in the front wall 11 of the plastic terminal protector 12, and is used to change the direction of the insertion hole 13. As shown in FIG. 7, the bellows 15 is desirably thinner than the front wall 11, for example. Of course, the bellows 15 may have a single layer as shown in FIG. 5, or a double layer as shown in FIG. 8, or may have more than one layer. Then, as shown in FIG. 5, the tip portion 1c of the inclined electric conduit 1 is inserted into the insertion hole 13, and the terminal protector 12 is fixed to the curtain plate 7 with nails or the like. Next, ready-mixed concrete is poured around the terminal protector 12. Thereafter, the terminal protector 12 is removed from the concrete wall along the length of the tip end 1c of the conduit 1 by hand or the like, as in the conventional case.

In the present invention, the terminal protector 12 is
When the distal end portion 1c of the conduit 1 is pulled out from the concrete wall with fingers or the like along the length direction, the bellows 15 can absorb differences in the inclination angle θ of the distal end portion of the conduit 1.

The significance of the bellows 15 in the present invention is that even if the inclination angle θ of the conduit is small and the terminal protector cannot be removed in the direction of arrow A, the bellows 15 has the effect of making the terminal protector 12 removable. It is about achieving. Therefore, as long as such an effect can be achieved, the amount of expansion and contraction of the bellows 15 does not matter.

Furthermore, in the present invention, the difference in the inclination angle θ can be absorbed by the bellows 15, so even if the inclination angle θ of the conduit 1 is small, unlike the conventional case, the terminal protector is not required. 12 can be reliably fixed to the curtain plate 7. FIG. 10 shows a fourth embodiment of the present invention, in which the insertion hole 1
The cylindrical body forming 3 is formed by a bellows 15.

[Brief explanation of the drawing]

Figures 1 to 4 are explanatory diagrams of the conventional technology. Figure 1 is a perspective view of the semi-cylindrical terminal protector 2 in use, and Figure 2 is a vertical cross-section of the front wall and top wall. FIGS. 3 and 4 are a perspective view, a longitudinal sectional side view, of the terminal protector 3 in use, which is inclined in a U-shape. Figures 5 to 7 show the first embodiment of the terminal protector according to the present invention, in which Figure 5 is a vertical side view, Figure 6 is a front view, and Figure 7 is an enlarged vertical side view of the vicinity of the bellows. It is. 8 and 9 are longitudinal sectional side views of a second embodiment and a third embodiment of the terminal protector according to the present invention. FIG. 10 is an enlarged longitudinal sectional side view of the vicinity of the bellows of the fourth embodiment. In the figure, 11 is the front wall, 12 is the terminal holder, and 13
14 indicates an insertion hole, 14 indicates an upper wall, and 15 indicates a bellows.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The front wall and the top wall having the insertion holes are inclined in a vertical cross-section approximately in the shape of a square, and the tip of the electrical conduit is bent and inclined at a predetermined angle. A terminal protector that is buried in concrete with the end of the conduit inserted through the insertion hole, and is pulled out from the concrete wall along the length of the tip of the conduit, and has a cylindrical body that forms the insertion hole. A terminal protector for buried electric conduit, which extends outward or inward from the front wall and is integrally provided with a bellows around the cylindrical body. (2) The terminal protector according to claim 1, wherein the cylindrical body is formed of a bellows.