JP3937107B2 - Bell mouth for annular corrugated tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bell mouth that is used by being connected to an opening of a tubular body that is connected to a handhole or a manhole used as a relay point for an electric wire for embedding and forming an electric conduit in the ground. It is.
[0002]
[Prior art]
Conventionally, in the opening portion of the tubular body for connecting to the pipe connection hole of this kind of handhole or manhole and the like (hereinafter referred to as a handhole) to form a wire conduit, Inserting and fitting a member, which is generally called a bell mouth, with one end formed into a tapered cylindrical shape, this member is used as a member for protecting the tubular body opening and smoothly guiding the wire when the wire is inserted into the conduit. in use.
[0003]
However, the tube generally used in connection with a hand hole or the like is a spiral corrugated corrugated tube, and the bell mouth used in connection with the opening of the tube engages with the spiral corrugation of the tube. It has a structure with a spiral uneven part that is inserted into the opening of the tubular body by inserting the spiral concave part along the spiral of the tubular body while inserting the bell mouth spirally into the spiral tubular body. It was designed to be inserted and fixed.
[0004]
[Problems to be solved by the invention]
As described above, when the tubular body is a spiral corrugated corrugated tube, the bell mouth structure is also structured to have a spiral concave and convex portion that engages with the spiral concave and convex portions of the tubular body, so that the tubular body can fall off from the tubular body. However, when the tube is not a spiral concave / convex tube but an annular concave / convex corrugated tube, it is strong so that it does not fall out of the tube. Since it is difficult to connect to the network, it has not been generally implemented. However, there are pipes with not only a spiral corrugated waveform but also an annular corrugated corrugated tube. Naturally, such an annular corrugated tube is used as a connection connecting pipe to a handhole or the like. There is also a great demand for use.
[0005]
Therefore, the present invention is directed to such an annular corrugated tube and is attached to the opening of the annular corrugated tube in the same manner as the opening correcting means in the spiral corrugated tube using a conventional bell mouth. It is intended to provide a bell mouth that can compensate for this.
[0006]
[Means for Solving the Problems]
The configuration of the present invention for achieving the object will be described using the reference numerals used in the embodiments. The configuration of the bell mouth referred to in the present invention is a pipe formed in a wire relay portion H such as a handhole or a manhole. A bell mouth that is used by being connected to the opening 31 of the annular corrugated pipe P that is used by being connected to the connection hole h, and is constituted by a bell mouth main body B and a fitting ring R. The outer peripheral surface of the cylindrical part 1 has a plurality of engaging protrusions 2 projecting in the radial direction at an appropriate interval in the axial direction of the cylindrical part 1, and each of the engaging protrusions 2 is Inclined toward the bell-shaped opening 3 and can be laid down toward the bell-shaped opening 3, and in the opposite direction, that is, toward the cylindrical opening 4 It is formed so as to hold the strong resistance, before The fitting ring R is formed in a substantially C shape, has elasticity in the direction of diameter reduction, its outer peripheral part 11 is larger than the inner diameter d of the small diameter part 32 in the annular concave and convex corrugated pipe P, and the inner peripheral part 12 has the same inner diameter. The inner diameter portion 12 is formed so as to be smaller in diameter than the engagement protrusion 2 in the bell mouth main body B , and the inner diameter portion 12 is engaged with the engagement protrusion. 2 are formed to engage with each other .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is configured as described above. In carrying out the present invention, for example, the engaging protrusion 2 formed on the outer peripheral surface of the cylindrical portion 1 of the bell mouth main body B is connected to the bell-shaped opening 3 side. The engaging protrusion 2 is formed as a large number of protrusions inclined along the axial direction at two points facing the circumferential direction of the cylindrical portion 1. can do. Of course, the protruding position of the engagement protrusion 2 is arbitrary, and may be formed in a line at one point in the circumferential direction, or may be formed in a line at three or four points, or may be formed in a line. Instead, they can be arranged in a zigzag or spiral shape in the circumferential direction. Further, the engaging protrusion 2 may be formed such that the surface on the bell-shaped opening 3 side that engages with the fitting ring R is along a spiral of a predetermined angle.
[0008]
Further, in the implementation of the fitting ring R, the inner peripheral portion 12 that engages with the engaging protrusion 2 is not limited to two, but only one or three or more are formed. It may be formed. Further, the engagement protrusion 2 is an inclined protrusion even when the surface of the inner peripheral portion 12 that engages with the engagement protrusion 2 is along a vertical plane orthogonal to the axial direction of the fitting ring R. In some cases, it may be formed so as to be inclined in the same inclination direction as the inclined protrusion 2. Moreover, the inner peripheral part 12 engaged with this engagement protrusion 2 can also be implemented as what is formed in the state along the predetermined spiral shape in the circumferential direction.
[0009]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of the bell mouth according to the present invention, FIG. 1 is a perspective view showing the overall shape, and FIGS. 2 and 3 are cylinders of the bell mouth main body B. FIG. 4 to 6 show the side shape, front shape, and cross-sectional shape of the fitting ring.
[0010]
Thus, the bell mouth according to the present invention is constituted by two members, the bell mouth main body B shown in FIGS. 1 to 3 and the fitting ring R shown in FIGS. 1 and 4 to 6. Has been. As shown in FIG. 11, which will be described later, these members are used by being inserted into the opening 31 of the annular corrugated pipe P that connects the opening end portion to the pipe connection hole h formed in the handhole or manhole H. Is. The former bell mouth main body B is integrally formed of a slightly flexible or viscous synthetic resin material.
[0011]
The structure of the bell mouth main body B is mainly composed of a cylindrical portion 1 whose one end is a cylindrical opening 4 and whose other end is a bell-shaped opening 3 widened in a trumpet shape. At two opposing points (upper and lower two points in the figure), a number of engaging projections 2 projecting in the radial direction at appropriate intervals along the respective axial directions are formed in a row. Each of the engaging projections 2 is inclined toward the bell-shaped opening 3 and can be laid down toward the bell-shaped opening 3, and is in the opposite direction, that is, the tube. It is formed so as to maintain a strong resistance toward the shape opening 4 side. In the bell mouth body B of the embodiment shown in the drawings, a dust cap 5 is integrally connected to the outside of the bell-shaped opening 3 via a cutting groove 6 for cutting.
[0012]
The fitting ring R is a molded product integrally formed of a synthetic resin material having excellent elasticity, and the entire shape is formed in a substantially C shape, has elasticity in the direction of diameter reduction, and has a cross-sectional shape. Has a U-shape opening in the axial direction. And the diameter of the outer peripheral part 11 in this ring R is larger than the internal diameter d (refer FIG. 7) of the small diameter part 32 in the said cyclic | annular uneven | corrugated corrugated pipe P, and is equal to or smaller than the internal diameter D of the large diameter part 33. The inner peripheral portion 12 is formed to have a slightly smaller diameter than the inner diameter d of the small diameter portion 32 in the pipe P. By doing so, the inner diameter portion 12 and the engaging protrusion 2 in the bell mouth main body B are engaged with each other. Further, the ring R is formed in an inclined surface in which inner surfaces 13 and 13 facing each other having a U-shaped cross section are orthogonal to the axis and the outer surfaces 14 and 14 are inclined toward the center in the width direction.
[0013]
The bell mouth formed as described above has a handhole H or a manhole used as a relay point for electric wires, telephone lines, etc. as shown in FIG. 7 to FIG. As shown in FIG. 7 and FIG. 8, the tubular body for use in connection with the pipe connection hole h is a tubular body P in which the shape of the tubular wall is formed in an annular corrugated waveform. First, while compressing and deforming the fitting ring R in the radial direction, the fitting ring R is inserted into the first large-diameter portion 33 from the opening 31 of the tubular body P. Subsequently, as shown in FIGS. The mouse body B is pressed into the tube P. At this time, the engaging protrusion 2 of the bell mouth main body B is in a lying posture toward the bell-shaped opening 3 side, and in combination with the temporary expansion of the fitting ring R in the outer peripheral direction, Of the fitting ring R passes through the inner peripheral portion 12 of the fitting ring R, and some or some of the projections 2 are positioned between the opposing inner side surfaces 13, 13 of the fitting ring R. The bell-shaped opening 3 of the main body B stops in contact with the opening 31 of the tube P.
[0014]
At this time, the protrusion 2 located between the opposing inner side surfaces 13, 13 of the fitting ring R contacts the inner side surface 13 of the ring R on the tube opening side, and the tube P of the bell mouth main body B Prevent exit from. The dust-proof cap 5 integrally connected to one end of the bell mouth main body B may be cut from the cutting groove 6 after being attached to the tube P to have no cap as shown in FIG. You may cut and remove before attaching to P. Needless to say, the bell mouth body B referred to in the present invention may be molded without the dust cap 5.
[0015]
Thus, as shown in FIG. 11, the tube P is opened on the inner surface side of the pipe connection hole h of the handhole H or manhole used as a relay point for electric wires, telephone lines, and the like. Used in conjunction as a state. As shown in FIG. 17, the tubular body 1 has a large-diameter portion 33 having a substantially square cross-sectional shape and a small-diameter portion 32 having a substantially circular cross-sectional shape arranged alternately in the axial direction of the tubular body. As shown in FIG. 18, the tubular body is provided with a large-diameter portion 33 having a substantially circular shape with a large cross-sectional shape and a small-diameter portion 32 with a substantially circular shape having a small cross-sectional shape. And the tubes are alternately arranged.
[0016]
Thus, the bell mouth said to this invention is attached and used for the opening part 31 of the pipe body P for using it as an electric wire conduit. The pipe body P is disposed in the pipe connection hole h of the hand hole H, and a filling hardening material M such as cement mortar is interposed between the outer peripheral surface of the pipe body P and the inner peripheral surface of the pipe connection hole h of the hand hole H. Filled and the tube P is fixed to the hand hole H in a watertight manner by the hardening of the filling hardening material M.
[0017]
The length of the tube P itself may be long or may be cut to an appropriate length, and as shown by the phantom line in FIG. laying another pipe P ₂ in the extending direction of P, coupled between them by a connecting joint C, to form a series of conduit until the next hand hole.
[0018]
FIGS. 12 to 14 show another embodiment of the fitting ring R. In the ring R of the embodiment, two ring portions having a U-shaped cross section are symmetrical and have the same shape on both sides. The fitting ring described below is related to a ring that has a front and back irregular shape and has directionality in the insertion direction. . In the fitting ring R shown in FIG. 12, the shape of the left ring portion in the fitting ring R shown in the first embodiment is the same as the shape of the right ring portion, and the right side wall 14a is an inclined wall. The wall 13a is formed as a vertical wall, and the left and right ring portions engage with the engaging protrusions 2 of the bell mouth main body B to prevent it from coming off. The fitting ring R in FIG. 13 has a ring portion in the fitting ring R in FIG. 12 that is an inclined wall in which the small diameter portion 12 side is inclined to the left in the axial direction by a gap s compared to the large diameter portion 11 side. 14 has a shape in which a ring portion of the fitting ring R in FIG. 13 is inclined along a spiral direction of a predetermined angle. In each of the above embodiments, two ring portions that engage with the engagement protrusion 2 of the bell mouth main body B are shown as being provided side by side. However, these ring portions are not limited to two, for example, As shown in FIG. 15, only one is formed, three are formed as shown in FIG. 16, or four or more are formed in some cases. Good.
[0019]
19 and 20 show another embodiment of the bell mouth main body B. The bell mouth main body B shown in FIG. 19 is a surface on the bell-shaped opening 3 side of each engaging projection 2. The surface on the side that engages with the fitting ring R and performs the retaining action is brought up vertically from the cylindrical portion 1 so as to exert a strong anti-separation force. The bell mouth body B shown in FIG. 20 has a shape in which the protruding direction of each engaging protrusion 2 is inclined so as to follow a spiral direction of a predetermined angle. In the above embodiment, the protruding positions of the engaging protrusions 2 are shown as being arranged in two places in the circumferential direction. However, the protruding positions are arranged in one place in the circumferential direction. It may be arranged in three or four places, or may be arranged in a zigzag or spiral shape in the circumferential direction instead of the formation.
[0020]
Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited only to the structures of these embodiments, and includes the above-described configuration requirements according to the present invention. It can be carried out with appropriate modifications within the scope of achieving the purpose and having the following effects.
[0021]
【The invention's effect】
As is clear from the above description, the bell mouth referred to in the present invention has such an annular undulating corrugated tube, although the tubular body is not a spiral corrugated tubular body but an annular uneven corrugated tubular body. A bell mouth that can be used to connect and connect a hand hole or manhole to the body, and is attached to the opening of such a helical corrugated tube that did not exist in the past. The present invention has led to the provision of a bell mouth capable of correcting the above.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of the present invention.
FIG. 2 is a rear view of the bell mouth main body of FIG.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a rear view of the fitting ring of FIG. 1. FIG.
FIG. 5 is a front view of FIG. 4;
6 is a cross-sectional view taken along line VI-VI in FIG.
FIG. 7 is a longitudinal sectional view showing the relationship between a bell mouth and a tubular body.
FIG. 8 is a longitudinal sectional view showing a state in which a fitting ring is inserted into a tubular body.
FIG. 9 is a longitudinal sectional view showing a state in which a bell mouth is inserted into a tubular body.
10 is a longitudinal sectional view similar to FIG. 9 with the cap portion removed.
FIG. 11 is a partially longitudinal sectional view showing a use state.
FIG. 12 is a central longitudinal sectional view of a fitting ring showing another embodiment.
FIG. 13 is a central longitudinal sectional view of a fitting ring showing another embodiment.
FIG. 14 is a central longitudinal sectional view of a fitting ring showing another embodiment.
FIG. 15 is a central longitudinal sectional view of a fitting ring showing another embodiment.
FIG. 16 is a central longitudinal sectional view of a fitting ring showing another embodiment.
FIG. 17 is a perspective view of a tubular body.
FIG. 18 is a perspective view of another tubular body.
FIG. 19 is a central longitudinal sectional view of a bell mouth body showing another embodiment.
FIG. 20 is a plan view of a bell mouth body showing another embodiment.
[Explanation of symbols]
B Bell mouth body R Fitting ring P Tube 1 Tubular portion 2 Engagement protrusion 3 Bell-shaped opening 4 Tubular opening 11 Outer peripheral portion 12 Inner peripheral portion 13 Inner side surface 14 Outer side surface 31 Opening portion 32 Small diameter portion 33 Large Diameter

Claims (3)

A bell mouth connected to the opening (31) of the annular corrugated tube (P) used in connection with the pipe connection hole (h) formed in the wire relay part (H) such as a hand hole or manhole. The bell mouth main body (B) and the fitting ring (R), the bell mouth main body (B) is arranged on the outer peripheral surface of the cylindrical portion (1) in the axial direction of the cylindrical portion (1). , And a plurality of engaging protrusions (2) projecting in the radial direction at appropriate intervals, and each of the engaging protrusions (2) is directed toward the bell-shaped opening (3). And can be laid down toward the bell-shaped opening (3) , and maintains a strong resistance in the opposite direction, that is, toward the cylindrical opening (4). The fitting ring (R) is formed in a substantially C shape and has elasticity in the direction of diameter reduction, and its outer peripheral part (11) is a small diameter part (32) in the annular corrugated corrugated pipe (P). Inner diameter (d) Ri is large, the inner peripheral portion (12) is configured to be slightly smaller in diameter or approximately the same diameter as the inside diameter (d), the engaging projection the inner diameter portion (12) in the bell mouth body (B) (2 A bell mouth for an annular corrugated tube formed so that the inner diameter portion (12) and the engaging protrusion (2) are engaged with each other . Engaging projections formed on the outer circumferential surface of the cylindrical portion of the bell mouth body (B) (1) (2) is, according to claim 1 which is inclined projection which is inclined toward the bell-like opening (3) side The bell mouth for the ring-shaped uneven corrugated tube as described in 1 . There are many engaging projections (2) formed on the outer peripheral surface of the cylindrical portion (1) of the bell mouth body (B) at two points facing the circumferential direction of the cylindrical portion (1) along the axial direction. The bell mouth for an annular corrugated corrugated tube according to claim 1 formed.

Images