JPH034105Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a clamp ring used in a tube connector when attaching a tube, for example, a conduit tube for electrical wiring, to an electrical control panel or control equipment.

(Prior art) Conventionally, as shown in FIG. 1, for example, a tube is attached to a connector by coating the outer periphery of a metal flexible tube 3 with vinyl 4 in a tube insertion hole 2 formed stepwise in a cylindrical nipple body 1. Insert the flexible conduit tube 5 with the terminal cap 6 over its end, and screw the tightening nut 7 onto the nipple body 1. 8 comes into contact with the tapered surface 10 of the protrusion 9 formed on the inner periphery of the tightening nut 7, crushing it, and bites into the vinyl 4 coating of the conduit tube 5, and in this state, the conduit tube 5 is attached to the nipple body 1. Alternatively, as shown in FIG. 3, insert the conduit tube 13 with the terminal cap 14 over its end into the tube insertion hole 12 formed stepwise in the cylindrical nipple body 11, and When the tightening nut 15 is screwed onto the terminal cap 11, the sleeve 16 shown in FIG. It bites into the vinyl 18 coating, and in this state, the conduit tube 1
3 is attached to the nipple body.

However, in this case, a considerable amount of tightening torque is required to tighten the terminal cap 6 or sleeve 16 with the tightening nuts 7, 15, and there is a considerable allowable range for the outer diameter of the conduit tubes 5, 13. In some cases, a stronger tightening torque is required, which makes the workability of attaching the conduit tubes 5, 13 to the nipple bodies 1, 11 extremely poor.
terminal cap 6 or sleeve 16 for
Since the biting is only partial and the amount of biting is small, the connection strength is low. Therefore, in order to increase the connection strength by making a sufficient amount of biting, the inner diameter of the terminal cap 6 or sleeve 16 is set to the average of the conduit tubes 5 and 13. If the terminal cap 6 or the sleeve 16 is manufactured according to the target outer diameter, there is a problem that the terminal cap 6 or the sleeve 16 may not fit into the conduit tube 5, 13, making it impossible to assemble the terminal cap 6 or the sleeve 16.

(Purpose of the invention) Therefore, the present invention provides a connector in which a tube is attached to a nipple body by screwing a tightening nut onto the nipple body, and a circle that fits tightly between the tube and the tightening nut and has a sealing function. An object of the present invention is to provide a ring-shaped clamp ring that is expandable and contractible in the circumferential direction.

(Structure of the invention) That is, as shown in FIG.
A clamp ring 2 for a connector is attached between the tightening nut 22 and the tube 21 of a connector which attaches the tube 21 to the nipple body 19 by screwing the tightening nut 22 onto the nipple body 19 into which the tube 21 is inserted.
4, in order to attach the clamp ring 24 in close contact between the tightening nut 22 and the tube 21 and maintain the sealing function regardless of the change in the outer diameter of the tube 21, the clamp ring 24 is It is formed of a rubber cylindrical ring, and the outer peripheral surface of the rubber cylindrical ring is a tapered surface that can come into contact with the tapered surface 23 of the tightening nut 22, and a plurality of cylindrical rings are formed on the axis from both ends of the cylindrical ring. This clamp ring for a connector is formed so that book grooves are alternated and partially overlapped on the circumference so that the ring can be expanded and contracted in the circumferential direction while maintaining a sealable state.

(Operations and effects of the invention) When attaching the tube 21 to the connector using the clamp ring 24 configured as described above,
First, the tightening nut 22 and the clamp ring 24 are fitted into the tube 21 in this order, and then the tube 21 is inserted into the tube insertion hole 20 of the nipple body 19.
When the tightening nut 22 is tightened on the nipple body 19, the clamp ring 24
is compressed inward by the tapered surface 23 of the tightening nut 22 and bites into the surface of the tube 21, for example, a vinyl surface. In this state, the tube 21 is securely attached to the nipple body 19, and the outer peripheral surface of the tube 19 and the tightening nut are A clamp ring 24 is provided between the tapered surface 23 of 22 and
Regardless of the expansion and contraction of the clamp ring 24 in the circumferential direction due to changes in the outer diameter due to differences in the size of the tube 21, etc., the pressure contact is made in a continuous connection without any breaks.
The connector is sufficiently airtight at the clamp ring 24 position.

Moreover, when the tube 21 is attached by tightening the tightening nut 22, the tube 2
1, the tube 21 tends to shift from the inner surface of the clamp ring 24, but the entire inner surface of the clamp ring 24 is on the surface of the tube 21,
If the surface is made of vinyl with unevenness, for example, it will bite into the vinyl and hardly shift, and although the clamp ring 24 also tries to shift between the tapered surface on its outer periphery and the tapered surface 23 of the tightening nut 22, it will not shift. Since the tightening force on the tube 21 increases accordingly, even if the tube 21 is pulled in this attached state, the tube 21 will hardly shift and therefore will not come off.

(Example) Next, the configuration of an example of the present invention is shown in Figures 6 to 1.
This will be explained using Figure 0.

Flange portion 25 with a hexagonal engagement surface formed on the outer periphery
A cylindrical nipple main body 2 having a tube connecting portion 26 protruding from one end and a connecting body connecting portion 27 for connecting to, for example, a box of an electric control panel protruding from the other end.
The tube connection part 26 of No. 8 has a tube insertion hole 29.
The tube insertion hole 29 has a conduit tube, in this case a flexible conduit tube 32 whose outer periphery is coated with vinyl 31 and a terminal cap 33 at its end. The chamfered tapered surface 3 formed at the mouth of the tube insertion hole 29 is inserted in a covered state.
4 and the conduit tube 32 is an O for airtightness that is fitted in the conduit tube 32 in advance.
A ring 35, in this case, an O-ring 35 for airtightness is inserted to further improve the pressure-resistant and airtight performance.

Further, the inner surface of the tightening nut 37 screwed onto the screw 36 on the outer periphery of the tube connection portion 26 of the nipple body 28 has an uneven surface 38, for example, a tapered surface 39 formed in a stepped shape and whose inner diameter increases in the direction in which the conduit tube 32 is inserted. Formed, this tightening nut 3
Between the tapered surface 39 of 7 and the conduit tube 32, there is a clamp ring that is previously fitted into the conduit tube 32 and is expandable and retractable in the circumferential direction. With the surface 40 formed, a clamp ring 42 is inserted, which has a plurality of grooves 41 extending along the axial direction equally spaced in the circumferential direction from both left and right ends in an alternating manner to enable expansion and contraction in the circumferential direction. 2
A screw 43 is formed on the outer periphery of the connected object connecting portion 27 of No. 8 for fitting the connecting portion 27 into a hole in a box of an electric control panel and tightening it with a nut.

In the connector configured as described above, the conduit tube 32 is inserted into the tube insertion hole 29 of the nipple body 28 with the tightening nut 37, clamp ring 42, O ring 35, and terminal cap 33 fitted in this order. When the clamping nut 37 is screwed onto the screw 36 of the tube connection part 26 and tightened, the clamping ring 42
The tapered surface 39 of the tightening nut 37 bites into the vinyl 31 surface of the conduit tube 32, thereby allowing the conduit tube 32 to be attached to the nipple body 28, and the O-ring 35 tightening around the outer periphery of the conduit tube 32. By press-contacting the tapered surface 34 of the tightening nut 37 with the surface, the airtightness of the connector is also sufficiently ensured.

When the conduit tube 32 is pulled while the conduit tube 32 is attached by tightening the tightening nut 37, the conduit tube 32 tends to shift from the inner surface of the clamp ring 42, but the entire inner surface of the clamp ring 42 Because it bites into the vinyl 31 of the tube 32, it hardly shifts, and although the clamp ring 42 also tries to shift between the tapered surface 40 on its outer periphery and the tapered surface 39 of the tightening nut 37, the clamp ring 42 Tapered surface 40
The unevenness 38 of the tapered surface 39 of the tightening nut 37
In this case, the conduit tube 32 will not be displaced at all even if the conduit tube 32 is pulled in this attached state. However, since the clamp ring 42 does not shift due to engagement with the step-like unevenness 38, the conduit tube 32 shifts between the inner surface of the clamp ring 42 as shown in FIG. 10A, but in this case, the conduit tube Even if the clamp ring 32 is displaced, the inner diameter of the clamp ring 42 does not change, so the vinyl 31 of the conduit tube 32 will not be torn due to this tension, and the sealing performance will be sufficiently ensured along with the installation condition of the conduit tube 32. can do.

That is, as shown in FIG. 10B, if the tapered surface 45 of the tightening nut 44 has no unevenness, when the conduit tube 32 is pulled, the clamp ring 42 also moves together with the conduit tube 32, and the clamp ring 42 is the tightening nut 4
As a result, when the conduit tube 32 is pulled while the conduit tube 32 is attached by tightening the tightening nut 37, the conduit tube 3
2 tends to shift between itself and the inner surface of the clamp ring 42, but if the entire inner surface of the clamp ring 42 is made of the surface of the conduit tube 32, for example vinyl 31 with uneven surfaces, it will bite into the vinyl 31 and almost shift. Moreover, although the clamp ring 42 also tends to shift between the tapered surface 40 on its outer periphery and the tapered surface 34 of the tightening nut 37, the clamping force against the conduit tube 32 increases by the amount of shift. In this attached state, even if the conduit tube 32 is pulled, the conduit tube 32 will hardly shift, and therefore will not come off.

The shape of the clamp ring 42 and the shape of the unevenness 38 on the tapered surface 39 of the tightening nut 37 can be arbitrarily set depending on the type, shape, etc. of the conduit tube 32.

[Brief explanation of drawings]

FIG. 1 is a half-cut side view of the first conventional embodiment;
FIG. 2 is a half-cut side view of the terminal cap 6, FIG. 3 is a half-cut side view of the second conventional embodiment, FIG. 4 is a half-cut side view of the sleeve 16, and FIG. 5 is a side view of the conventional second embodiment. FIGS. 6 and 7 are half-cut side views of an embodiment of the present invention, FIG. 8 is a half-cut side view of the tightening nut 37, and FIG. 9 is a clamp ring thereof. 4
2 and FIG. 10 are explanatory diagrams of its operation. 19: Nipple body, 20: Tube insertion hole,
21: Tube, 22: Tightening nut, 23:
Tapered surface, 24: Clamp ring.

Claims (1)

[Scope of utility model registration request] For a connector to be attached between the tightening nut and the tube of a connector that attaches the tube to the nipple body by screwing a tightening nut to the nipple body, in which the tube is inserted into a tube insertion hole formed stepwise in the cylindrical nipple body. The clamp ring is a rubber cylindrical shape in order to attach the clamp ring in close contact between the tightening nut and the tube and maintain a sealing function regardless of changes in the outer diameter of the tube. Formed with a ring,
The outer peripheral surface of the rubber cylindrical ring is a tapered surface that can come into contact with the tapered surface of the tightening nut, and
A clamp ring for a connector, characterized in that a plurality of grooves are formed on the axis from both ends of the cylindrical ring, alternating and partially overlapping on the circumference so that the ring can be expanded and contracted in the circumferential direction while maintaining a sealable state. .