JP2569866Y2 - Flexible conduit fittings - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to connecting a flexible conduit having a corrugated outer peripheral surface, such as a conduit, to a box or the like. The present invention relates to a flexible conduit connector used for connecting flexible conduits. 2. Description of the Related Art Most of conventional connecting devices of this type include a cylindrical first connecting device for receiving a flexible conduit, and a first connecting device which is screwed around the outer periphery of the first connecting device. A second connecting member having a cylindrical shape through which the flexible conduit is inserted, and a ring-shaped pull-out for engaging a valley of the flexible conduit between the first connecting member and the second connecting member. Hold the stop member (sandwich)
It is of a configuration that causes [0003] However, in the case of the above-mentioned conventional flexible conduit fitting as described above, since the number of installations is large, screwing work of the second fitting is required on site. In some cases, the second connector was not securely screwed in due to inadequate work at the site. The present invention has been made in view of the above circumstances, and it is possible to easily and surely equip the first connector with the second connector, and to sufficiently perform the function of preventing the flexible conduit from coming off. It is an object of the present invention to provide a flexible conduit connector which can be used. [0005] In order to achieve the above object, a flexible conduit connector according to the present invention is provided so as to extend concentrically from a small-diameter portion and one end of the small-diameter portion. A cylindrical first connecting member having a large-diameter portion integrally formed and having an opening at a tip end of the large-diameter portion; A plurality of engagement holes penetrating the peripheral wall of the large-diameter portion are formed at intervals, and the gap between one end edge of the engagement hole on the small-diameter portion side and one end of the small-diameter portion is formed. A portion surrounded by the peripheral wall is formed in a tube end receiving space having a length capable of accommodating the entirety of at least one ridge provided at the end of the flexible conduit tube inserted into the first connector. , than the outer diameter of the flexible conduit has an inner peripheral surface of the large heard inside diameter and the flexible conduit is inserted The second connector tubular being, out of the plurality of arms which is elastically displaceable radially outward and radially inward Metropolitan and provided in each of these arms plurality of said engaging holes A plurality of engagement portions each of which is inserted between the rim portions and is fitted into the plurality of engagement portions, and the plurality of engagement portions are provided by radially inward elastic displacement of the plurality of arms. Are inserted through the openings at the distal end of the large inner diameter portion of the first connector and are fitted into the respective engagement holes , and inside these engagement portions, at the valleys of the flexible conduit tube. An engaging claw to be engaged is formed, and a mutual interval between the engaging claw and one end edge of the engagement hole on the small inner diameter portion side is a length capable of accommodating a plurality of peaks of the flexible conduit tube. The outer peripheral surface on the opening side of the engaging portion has an outer peripheral surface on the opening side of the inner peripheral edge of the engaging hole. On The arms and the engaging portion is elastically deformed to the radially inward are formed on the inclined surface for displacing the said radially inwardly when pressed axially,
An inner peripheral surface of the peripheral wall between one end edge of the engagement hole on the small inner diameter portion side and one end of the small inner diameter portion is gradually reduced in diameter toward the small inner diameter portion, and the first connection is performed. The flexible conduit tube is formed in a tapered surface that is in contact with the outer peripheral surface of the peak portion of the flexible conduit tube that is inserted into the tool over the entire circumference. According to the present invention, the ends of the flexible conduits inserted into the second connector and the first connector are housed in the tube-end receiving space of the first connector, and the flexible wire tube is accommodated. By engaging the engaging claw of the second connector with the valley of the flexible conduit, the flexible conduit is connected to the connector. In this connection state, at least one mountain portion is housed in the tube end receiving space, and a plurality of the flexible conduits are disposed between the engagement claw and one end edge of the engagement hole on the small inner diameter side. (Two or more) ridges are accommodated, so at least three ridges are provided on the end side of the flexible conduit below the engagement portion between the engaging claw and the valley of the flexible conduit. Will exist. For this reason, the outer peripheral surface (the inclined surface) of the end portion of the engaging portion is pressed against the rim portion of the engaging hole by the pulling force applied to the flexible conduit in the pulling direction, and the arm portion is accordingly moved. When the engaging portion is elastically deformed inward in the radial direction and the engaging portion is displaced inward in the radial direction, the valley portion of the flexible conduit tube engaged with the engaging claw may be deformed. The situation where the flexible conduit tube is pulled out does not occur. By the way, in a flexible conduit in which peaks and valleys are alternately arranged in the axial direction, the shape retention strength at the end (strength for keeping the tube cylindrical) is far from the end. Since the strength is lower than the shape retention strength of the place, the peaks and valleys located at the end are more easily deformed than the peaks and valleys located away from the end. In other words, it can be said that the ridges and valleys are more difficult to deform as they are located farther from the ends of the flexible conduit. Therefore, for example, if the engaging claw is merely engaged with the valley located at the end of the flexible conduit, the valley is deformed into an irregular shape due to the tensile force applied to the flexible conduit, and the engagement is caused. There is a large possibility that the engagement with the dowel is released. However, in the connecting device of the present invention, at least three end portions of the flexible conduit are located closer to the end of the flexible conduit than the engaging portion between the engaging claw and the valley of the flexible conduit as described above. Since the two peaks are arranged, the engagement point is a point relatively separated from the end of the flexible conduit. For this reason,
The tractive force applied to the flexible conduit in the pulling direction does not deform the valleys of the flexible conduit engaged with the engaging claws and the flexible conduit is pulled out. Further, according to the present invention, the second connecting member includes:
A plurality of arms capable of being elastically displaced radially outward and radially inward are provided, and a plurality of engaging portions provided on each of the arms are provided. The plurality of engaging portions are inserted from the distal end openings of the large-diameter portion of the first connecting tool and fitted into the respective engaging holes by elastic displacement toward The second connector can be easily and reliably mounted on the first connector. Further, according to the present invention, the inner peripheral surface of the peripheral wall between one end edge of the engagement hole on the small inner diameter portion side and one end of the small inner diameter portion faces the small inner diameter portion side. Since the diameter of the flexible conduit is gradually reduced and is formed on a tapered surface that comes into contact with the outer peripheral surface of the ridge of the flexible conduit inserted into the first connector over the entire circumference, the flexible conduit is inserted into the first connector. The outer peripheral surface of the peak portion of the flexible conduit tube abuts on the tapered surface over the entire circumference. Therefore, the open end of the flexible conduit is isolated from the outside, so that foreign matter does not enter the flexible conduit from the outside. Further , according to the present invention, the first cylindrical connection is provided.
A plurality of engagement holes formed in the peripheral wall of the large inner diameter portion of the
Above penetrating the wall and so penetrating the surrounding wall
A cylindrical second connector is provided between the inner and outer edges of the engagement hole.
Is engaged so that
Therefore, the outer diameter of the first connection fitting does not become unnecessarily large.
Therefore, the enlargement of the connection tool is suppressed. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view, and FIG. 2 is a cross-sectional explanatory view showing a vertical cross section above the center line 100 and a horizontal cross section below the center line 100. In this embodiment, a case where a flexible conduit tube is connected to an electric wire box will be described. In the drawing, 1 is a side wall of the electric wire box A, 2 is a resin having a small inner diameter portion 21 and a large inner diameter portion 22 integrally formed so as to extend concentrically from one end 21b of the small inner diameter portion 21. Is a cylindrical first connection tool, which has a screw portion 21a formed on the outer peripheral surface of the small inner diameter portion 21 and protrudes into the electric wire box A by being inserted into a hole 1a formed in the side wall 1 of the electric wire box A. has become possible way, also in the middle portion in the axial direction of the peripheral wall 22a of the large diameter portion 22, as best shown in FIG. 3, the two locations where the rectangular-shaped engagement hole 23 is opposed in the circumferential direction It is formed so as to penetrate the peripheral wall 22 . One side surface 23a of the engaging hole 23 on the side of the electric wire box A and the other side surface 23b facing the side.
Is formed in a direction substantially perpendicular to the axial direction of the large inner diameter portion 22. Further, the two engagement holes 23 of the first connecting device 2
The inner diameter of the inner wall surface of the peripheral wall 22a located between
The inner wall surface is slightly larger than the outer diameter of the
4 ... A depression 25 is formed on the outer surface of the peripheral wall 22a. Further, the inner peripheral surface of the peripheral wall 22a between the one end edge 23a 'of the engaging holes 23, 23 on the side of the small inner diameter portion 21 and one end of the small inner diameter portion 21 in the inner peripheral surface of the first connecting member 2. Is formed on a tapered surface 26 which is gradually reduced in diameter toward the small inner diameter portion side 21 and is in contact with the outer peripheral surface of the peak portion 32 of the flexible conduit tube 3 inserted into the first connector 2 over the entire circumference. When the ridge 32 of the flexible conduit tube 3 comes into contact with the tapered surface 26, the flexible conduit tube 3 is inserted into and connected to the first connector 2 via a second connector 4 described later. The open end 3a of the flexible conduit 3 is isolated from the outside so that foreign matter does not enter from outside the first and second connecting tools 2 and 4. A portion surrounded by the peripheral wall between one end edge 23a ′ of the engagement hole 23 on the small inner diameter portion side and one end 21b of the small inner diameter portion 21;
That is, a portion of the peripheral wall 22a surrounded by the tapered surface 26 is a tube end receiving space S, and the tube end receiving space S is at least one mountain provided at the end of the flexible conduit tube 3. It has a length that can accommodate the entire part 32. In the illustrated example, the length of the tube end receiving space S is such that the entire peak 32 of the flexible conduit tube 3 and approximately half of the peak 32 adjacent thereto can be stored. The flexible conduit 3 is made of resin and has a well-known bellows shape in which valleys 31 and peaks 32 are alternately formed in the circumferential direction on the peripheral wall. Reference numeral 4 denotes a second connector made of resin. This second
The connection tool 4 has an inner peripheral surface having an inner diameter slightly larger than the outer diameter of the flexible conduit tube 3. The second connecting member 4 is provided on one side surface of the annular base 41 through which the flexible conduit 3 is inserted, into the peripheral wall 22a of the first connecting member 2,
Of the wire box A side, ie, the first connector 2
Are formed integrally with each other so as to be inserted from the opening 27 at the tip end of the first connection so as to correspond to the interval between the engagement holes 23. Each of the arms 42 is connected to the first connection. Each of the arms 42 is formed so as to be loosely fitted on the peripheral wall 22a between the opening 27 and the engaging hole 23 of the tool 2 with a space therebetween.
.. Are inserted between the inner and outer edges of the engaging holes 23.
An engaging portion 43 to be fitted and fitted is integrally formed. The arm 42 is elastically displaceable radially outward and radially inward. The tip surfaces 43a of these engaging portions 43 are formed.
Are formed in a tapered surface inclined from the outer peripheral side toward the inner peripheral side toward the base 41 side. The plurality of engaging portions 43 are inserted through the opening 27 at the end of the large inner diameter portion 22 of the first connection tool 2 due to the radially inward elastic displacement of the plurality of arms 42. When the engaging portion 43 is fitted into the engaging hole 23, the distal end surface 43 a of the engaging portion 43 faces the hole side surface 23 a of the engaging hole 23. It is supposed to. Also, the outer peripheral surface 43b of the end of each of the engaging portions 43 on the opening 27 side.
Are formed so as to be inclined in the same direction as the tapered surfaces of the end surfaces 43a. That is, when the end outer peripheral surface 43b is pressed in the axial direction against the edge of the engagement hole 23 on the opening 27 side, the arm portion 42 is moved inward in the radial direction. It is formed on an inclined surface that elastically deforms and displaces the engaging portion 43 inward in the radial direction. Further, inside the engagement portions 43, 43,
Each of the pair of wedge-shaped engaging claws 44, 44 engaging with the valley 31 of the flexible conduit tube 3 is integrally formed, and these engaging claws 44, 44 are formed on the valley portion 31 of the flexible conduit tube 3. Is prevented from being pulled out of the flexible conduit tube 3 toward the opening 27 (arrow B in the drawing). Here, the engaging claw 4
The mutual interval L between the end portions 23a 'of the engagement holes 23, 23 on the small inner diameter side of the engagement holes 23, 23 corresponds to the plurality (two in the example in the figure) of the ridges 3 of the flexible conduit tube 3. It has a length that can be stored. In addition, as shown in FIG. 2, the base 41 of the second connector 4 is formed so as to protrude outward from the opening 27 of the first connector 2. Reference numeral 5 denotes a lock nut for connecting and fixing the first connector 2 to the side wall 1 of the electric wire box A.
That is, when the electric wire is connected, the cap portion 5b is cut off from the main body 5a to form a cylindrical shape with both ends open. The procedure for connecting the flexible conduit 3 to the electric wire box A via the first and second connectors 2 and 4 will be described. First, the arms 42 of the second connector 4 will be described. Are inserted into the large-diameter portion 22 of the first connector 2 and the engaging portions 43 at the tips of the arms 42 are fitted into the engaging holes 23 of the first connector 2, respectively. . Next, the flexible conduit tube 3 is inserted into the base 41 of the second connector 4 from between the arms 42..., And the engaging claws 44 of the second connector 4 are inserted into the valleys 31 of the flexible conduit tube 3. ... are engaged. At this time,
The end of the flexible conduit tube 3 is inserted into the tube end receiving space S. Thereafter, the small inner diameter portion 21 of the first connector 2 is passed through the hole 1a of the side wall 1 of the electric wire box A and protrudes into the electric wire box A, and the lock nut 5 is screwed into the screw portion 21a of the small inner diameter portion 21. Then, the first connector 2 is connected to the electric wire box A.
Is fixed to the side wall 1. As described above, the second connector 4 of the flexible conduit 3
The connection to the first connector 2 and the connection of the second connector 4 to the first connector 2 are all performed only by the insertion operation, and the operation can be performed extremely efficiently. Then, at the stage where the flexible conduit tube 3 is inserted and connected to the first connector 2 via the second connector 4,
The entire tip 32 of the flexible conduit tube 3 is entirely housed in the tube end receiving space S, and its outer peripheral surface has a taper of the inner wall of the first connector 2 over the entire circumference as shown in FIG. Face 26
The contact prevents foreign matter such as ready-mixed concrete from entering the opening 2a of the flexible conduit tube 3 from the engaging hole 23 side. Also, as can be seen in FIG.
Four ridges 32 are present on the end side of the flexible conduit tube 3 with respect to the engagement portion between the groove 4 and the valley portion 31 of the flexible conduit tube 3. For this reason, the engaging claw 44 is
Is engaged with the valley 31 that is hardly deformed at a position away from the end. Moreover, the flexible conduit 3 is first,
When connected to the side wall 1 of the electric wire box A via the second connecting tools 2 and 4, even if a tensile force in the direction of arrow B acts on the flexible electric conduit 3, the ends of the engaging portions 43. The outer peripheral surface 43b is
An inclined surface is formed inside the engaging hole 23.
Pressed against the edge on the opening 27 side of the side edge
Re order, the engaging portion 43 ...... by pulling of the flexible conduit 3
Cause the inner diameter to be reduced inward, the engagement of the engaging claws 44... With the flexible conduit valley 31 is further strengthened, and the flexible conduit 3 can be reliably prevented from being pulled out. When the tensile force acting on the flexible conduit 3 is large, if there is a space between the inner wall of the first connector 2 and the flexible conduit 3 in a portion where each arm 42 does not exist,
The radially inward displacement of each of the engagement portions 43 is increased, and the flexible conduit tube 3 is bent and deformed into the space so as to follow the displacement, and the engagement between the engagement hole 23 and the engagement portion 43 is increased. The mating relationship is released, and the second conduit 2 is engaged with the flexible conduit 3 from the first connector 2.
Although the connecting tool 4 comes off, since the tube supporting portion 24 swelling in the space is formed, the bending deformation can be prevented, and the flexible conduit 3 can be reliably prevented from being pulled out by such bending. it can. If the length of the flexible conduit 3 is erroneously cut off at the construction site and the flexible conduit 3 is to be pulled out intentionally, the base 41 of the second connector 4 must be removed. What is necessary is just to press in the middle C direction. Then, each engaging part 43 ...
, The tapered distal end surface 43a slides outward along the hole side surfaces 23a of the engaging holes 23 of the second connecting member 4, and
As a result, as the arm portion 42 elastically deforms radially outward, the engaging portion 43 is displaced radially outward, and each of the engaging claws 44.
Are detached from the valleys 31 of the flexible conduit 3 and the flexible conduit 3 can be easily pulled out. In this manner, the flexible conduit 3 can be easily pulled out by the pressing operation of the base 41 of the second connector 4, and the connection work can be easily corrected. In the above embodiment, the first connector 2 is connected to the electric wire box A by screwing the lock nut 5 into the screw portion 21a of the small inner diameter portion 21 of the first connector 2. It goes without saying that the connection structure can be variously changed in design. Further, in the above embodiment, the arm portion 42 and the engagement portion 43 are formed at two places. However, the present invention is not limited to such a case, but is formed at three or more places. The tube support may be provided at three or more locations. As described above, according to the present invention, the flexible electric wire is located closer to the engaging portion between the locking claw provided on the second connector side and the valley of the flexible conduit tube. Since at least three crests are arranged on the end side of the tube, the engaging claws engage with the valleys located at a position away from the end of the flexible conduit tube. For this reason, the situation in which the trough of the flexible conduit tube engaged with the engaging claw is deformed by the pulling force applied to the flexible conduit tube and the flexible conduit tube is pulled out does not occur. As a result, the retaining function in the connected state can be sufficiently exhibited. Nevertheless, the second connector can be easily and reliably mounted on the first connector. Further, according to the present invention, the outer peripheral surface of the ridge portion of the flexible conduit inserted into the first connector comes into contact with the tapered surface formed on the first connector side over the entire circumference. This has the effect that the open end of the flexible conduit is isolated from the outside, so that foreign matter does not enter the flexible conduit from the outside. Further , according to the present invention, the first connector Ouchi
Between the inner and outer rims of the engagement hole penetrated through the peripheral wall of the diameter part
The fitting portion of the second connector is inserted into
The outer diameter of the first connector, and thus the connector
The effect of suppressing the enlargement of is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a connector for a flexible conduit according to an embodiment of the present invention. FIG. 2 is an explanatory sectional view of the flexible conduit connector in the embodiment. FIG. 3 is a cross-sectional view of the flexible conduit connector according to the embodiment cut in a direction orthogonal to the axial direction. DESCRIPTION OF THE SYMBOLS A Flexible conduit tube connector 2 First connector 3 Flexible conduit tube 4 Second connector 21 Small inner diameter portion 21b One end 22 of the smaller inner diameter portion Large inner diameter portion 22a Peripheral wall 23 Engagement hole 23a ' One end edge 24 on the side of the small inner diameter portion side of inner hole 24 Inner peripheral surface 26 Tapered surface 27 Opening 31 Valley 32 Peak 42 Arm 43 Engaging portion 43b End outer peripheral surface 44 Engaging claw S Tube end receiving space L Engage Spacing between the claw and one edge of the engagement hole on the small inner diameter side

Claims (1)

(57) [Rules for requesting registration of utility model] The cylindrical first connector having a small inner diameter portion and a large inner diameter portion integrally formed so as to extend concentrically from one end of the small inner diameter portion and having an opening at a tip end of the large inner diameter portion; A plurality of engaging holes penetrating the peripheral wall of the large-diameter portion at a predetermined interval in the circumferential direction are formed in an intermediate portion of the peripheral wall of the large-diameter portion in the axial direction. A portion surrounded by the peripheral wall between one end edge on the inner diameter portion side and one end of the small inner diameter portion has at least one peak provided at an end of the flexible conduit tube inserted into the first connector. formed in the tube end receiving space having a whole can accommodate lengths of parts, than the outer diameter of the flexible conduit has an inner peripheral surface of the large heard inside diameter and cylindrical in which the flexible conduit is inserted The second connecting member has a plurality of arms that can be elastically displaced radially outward and radially inward, and each of these arms. Provided at a plurality of said engaging holes
A plurality of engaging portions which are respectively inserted and fitted between the inner and outer edge portions of the arm, and the plurality of engaging portions are formed by radially inward elastic displacement of the plurality of arms. The first connector is inserted through the opening at the end of the large-diameter portion and fitted into each of the engagement holes. Inside the engagement portions, the valleys of the flexible conduit are engaged. An engagement claw is formed, and a mutual interval between the engagement claw and one end edge of the engagement hole on the small inner diameter portion side has a length capable of accommodating a plurality of peaks of the flexible conduit tube. The outer peripheral surface of the engaging portion on the side of the opening is formed such that the outer peripheral surface of the end portion corresponds to the inner edge of the engaging hole.
The arm portion when pressed against the said axial direction with respect to the rim portion of the Chi the opening side is elastically deformed to the radially inward inclined surface for displacing the engaging portion to said radially inward The inner peripheral surface of the peripheral wall between the one end edge of the engagement hole on the small inner diameter portion side and one end of the small inner diameter portion gradually decreases in diameter toward the small inner diameter portion side. A flexible conduit tube fitting formed on a tapered surface that is in contact with an outer peripheral surface of a ridge portion of the flexible conduit tube inserted into the first connector over the entire circumference.