JPH0622687U - Hose coupling - Google Patents

Abstract

(57) [Summary] [Purpose] A hose can be quickly and surely connected to a connecting pipe when supplying cleaning water and the like, and the work of attaching and detaching the hose to the connecting pipe is facilitated. [Structure] A semi-circular shape that engages with the outer peripheral surface of the rubber boot 31 is formed, and thick-walled flat plate-shaped connecting portions 40 and 44 are provided at one end side, respectively.
The clamp halves 38 and 42 having the above are rotatably connected at the other end side, and between the connection parts 40 and 44, the base end side is pin-connected to the connection part 44 by the pin 48, and the tip end side is the connection part. 40
The connecting bar 47 protruding from the square hole 40A is provided, and the cam portion 52 is provided on the protruding end side of the connecting bar 47.
Is provided with a cam lever 51 rotatably connected to a pin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hose coupling which is preferably used for detachably connecting a hose to a tank connecting pipe in order to supply cleaning water into a tank when cleaning a dirty water tank or the like.

[0002]

[Prior art]

 6 to 9 show a conventional hose coupling.

In the figure, 1 is a vehicle such as a bus or train in which wheels 1 B, 1 B, ... Are provided on the chassis 1 A side, 2 is a waste water tank attached to the chassis 1 A of the vehicle 1, and the waste water tank 2 temporarily stores the sewage generated in the vehicle 1 and discharges the sewage to the outside at the base of the vehicle 1 or the like. On the side surface 2A of the dirty water tank 2, a discharge pipe 3 for discharging the dirty water in the dirty water tank 2 to the outside at the base of the vehicle 1 and a relay pipe 4 for flowing the wash water into the dirty water tank 2 are provided. Is provided. Here, the relay pipe 4 is fixed to the side surface portion 2A of the wastewater tank 2 as shown in FIG. 7 through a substantially disk-shaped fixing portion 5, and an L-shaped flow path is formed in the relay pipe 4. 6 is formed.

The relay pipe 4 has a connecting pipe 7 projecting forward from the side surface portion 2A of the wastewater tank 2 and connecting the flow path 6 to a hose 25, which will be described later, and an upward projecting flow from the relay pipe 4. Another connecting pipe 8 for connecting the passage 6 to a rubber pipe 10 described later is integrally formed. The connecting pipe 7 is formed into a stepped tubular shape having a large diameter portion 7A, a medium diameter portion 7B and a small diameter portion 7C, and the outer diameter of the large diameter portion 7A is between the medium diameter portion 7B and the small diameter portion 7C. An annular protrusion 7D corresponding to the size is formed. The connecting pipe 8 communicates with the connecting pipe 7 through the flow path 6, and a corrugated retaining portion 8A is formed on the outer peripheral surface of the connecting pipe 8.

Reference numeral 9 denotes a water supply pipe provided on the upper surface portion 2B of the dirty water tank 2, and the water supply pipe 9 has a cylindrical shape in which the same retaining portions 9A1 as the retaining portions 8A of the connecting pipe 8 are formed on the outer peripheral surface. Connection pipe 9A and a flange portion 9B formed at the lower end of the connection pipe 9A. The water supply pipe 9 is provided with a flange portion 9B around the water supply hole 2C formed in the upper surface portion 2B of the dirty water tank 2. And is fixed to the dirty water tank 2.

Reference numeral 10 denotes a rubber pipe for connecting the connection pipe 9 A of the water supply pipe 9 and the connection pipe 8 of the relay pipe 4, the rubber pipe 10 having a lower end side inserted into the connection pipe 8 of the relay pipe 4, The upper end side is inserted into the connection pipe 9A of the water supply pipe 9 to connect the water supply pipe 9 and the relay pipe 4.

Reference numerals 11 and 11 denote fastening rings. Each fastening ring 11 includes an annular portion 11A formed by a metal band or the like so as to be capable of contracting and expanding, and a fastening screw provided on the outer peripheral side of the annular portion 11A. 11B, the tightening ring 11 reduces the diameter of the annular portion 11A by turning the tightening screw 11B, and the rubber pipe 10 is strongly fastened to the connecting pipes 8 and 9A.

Reference numeral 12 denotes a hose coupling for connecting a hose 25 described later to the connecting pipe 7 of the relay pipe 4, and the hose coupling 12 is composed of a rubber boot 13 and a fastener 17 described later. . Here, the rubber boot 13 is composed of an intermediate tubular portion 14 formed in a relatively thick tubular shape, and a fitting portion 15 and a connecting portion 16 which are integrally formed on both end sides of the intermediate tubular portion 14. ing. A flange portion 15A is formed at one end of the fitting portion 15, and a fitting portion 15 is mounted on the outer peripheral side of the fitting portion 15 between the flange portion 15A and the intermediate tubular portion 14. It is 15B. Further, an annular protrusion 15C is formed on the inner peripheral side of the fitting portion 15, and the annular protrusion 15C is engaged with the outer peripheral side of the medium diameter portion 7B between the large diameter portion 7A and the annular protrusion 7D of the connecting pipe 7. To do.

Reference numeral 17 denotes a fastening device, and the fastening device 17 is composed of clamp half halves 18 and 19, which will be described later, and a leaf spring 20 as shown in FIG.

Reference numeral 18 denotes one clamp half body, and the clamp half body 18 is a circular arc portion connecting between the thick connecting portions 18A and 18B provided at both ends and the connecting portions 18A and 18B. 18C, and a semicircular recess 18D 1 is formed on the inner surface side of the clamp half body 18. Here, a screw hole 18B1 is formed in the plate thickness direction in the connecting portion 18B, and a tightening screw 22 described later is screwed into the screw hole 18B1.

Reference numeral 19 denotes another clamp half body, and the clamp half body 19 is similar to the clamp half body 18 and has connecting portions 19A and 19B, an arc portion 19C, and a semicircular concave portion. 19D, and an insertion hole 19B1 is formed in the plate thickness direction in the connecting portion 19B.

Reference numeral 20 denotes a leaf spring. The leaf spring 20 is fastened by bolts 21 and 21 to one end surface of each of the connecting portions 18A and 19A of each of the clamp halves 18 and 19 so as to clamp each clamp half. The split bodies 18, 19 are integrally connected between the connecting portions 18A, 19A.

Reference numeral 22 denotes a tightening screw, which is composed of a large end portion 22A and a screw portion 22B that extends from the large end portion 22A in the axial direction and has a male screw tip. 22 is penetrated through the insertion hole 19B1 of the clamp half body 19 and the screw portion 22B is screwed into the screw hole 18B1. A rod-shaped handle 23 is attached to the large end portion 22A so as to penetrate the large end portion 22A in the radial direction, and by rotating the handle 23, the clamp halves 18 and 19 approach each other. Then, the fitting portion 15 of the rubber boot 13 is tightened from the outside between the recesses 18D and 19D, and the rubber boot 13 is fixed so as not to come off from the connecting pipe 7.

Reference numeral 24 denotes a tubular joint that connects the rubber boot 13 to the hose 25. One end of the joint 24 is fitted in the connecting portion 16 of the rubber boot 13 and the other end is fitted in the hose 25. There is. Then, the rubber boot 13 and the hose 25 are fastened to both ends of the joint 24 by fastening the fastening rings 26 and 26 similar to the fastening ring 11 to the connecting portion 16 of the rubber boot 13 and one end of the hose 25. And are connected.

The hose coupling 12 according to the prior art is configured as described above, and when the inside of the dirty water tank 2 is washed at the base of the vehicle 1, the fitting portion 15 of the rubber boot 13 is attached to and detached from the connecting pipe 7 of the relay pipe 4. The fitting part 15 of the rubber boot 13 is pressed in the radial direction by fitting it as much as possible, tightening the tightening screw 22 of the tightening device 17 via the handle 23, and tightening the rubber boot 13 from the outside to the connecting pipe 7. The connection pipe 7 is brought into close contact with the outer peripheral surface of the connection pipe 7 so as to prevent the connection pipe 7 from being removed and maintain a liquid-tight state. Then, by supplying the washing water from the outside through the hose 25, the washing water is caused to flow into the wastewater tank 2 into the relay pipe 4 via the rubber pipe 10 etc., and the inside of the wastewater tank 2 is washed with this washing water. I am trying to do it. Further, when the cleaning work is completed, the rubber boot 13 is removed together with the hose 25 from the relay pipe 4 via the fastener 17.

[0016]

[Problems to be solved by the device]

 By the way, in the above-described conventional coupling 12 for a hose, since the tightening screw 22 of the tightening device 17 is rotated and tightened via the handle 23, every time the rubber boot 13 is attached to and detached from the connecting pipe 7. In addition, since the handle 23 of the fastener 17 needs to be rotated many times, the work of connecting the rubber boot 13 is complicated, and it is difficult to perform a quick attachment / detachment operation.

Further, extra effort is required to rotate the handle 23, and if the handle 23 is not tightly tightened, the rubber boot 13 will come off from the connecting pipe 7 of the relay pipe 4 due to water pressure, etc. There is a problem that it is scattered around.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention allows a hose to be quickly and reliably connected to a connecting pipe via a rubber boot when supplying cleaning water or the like, and the hose to the connecting pipe can be connected. It is intended to provide a hose coupling that can be easily attached and detached.

[0019]

[Means for Solving the Problems]

 The feature of the configuration adopted by the present invention to solve the above problem is that the fastener is formed in a semicircular shape with a curvature corresponding to the fitting portion of the rubber boots, and one end side is separated from the other. A pair of clamp halves, which serve as connecting portions and whose other ends are rotatably pin-joined to each other, and a base end side of which is pin-connected to one connecting portion, which is located between the connecting portions of the clamp half halves. , A tip end side of which is rotatably pin-coupled to a connecting member protruding outward from the other connecting portion and a protruding end side of the connecting member, and the other connecting portion is pushed toward the one connecting portion. By doing so, the fitting portion of the rubber boot is configured with the cam lever that is sandwiched between the clamp halves from the outside in the radial direction.

[0020]

[Action]

 With the above structure, the connecting parts of the clamp halves can be brought closer to each other simply by turning the cam lever of the fastener, and the rubber boots can be made stronger in the radial direction by bringing the clamp halves closer to each other. Can be pinched.

[0021]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In the embodiments, the same components as those of the above-mentioned conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 31 indicates a rubber boot used in this embodiment, and the rubber boot 31 has an intermediate tubular portion 32, a collar portion 33A and a mounting portion 33B, which is similar to the rubber boot 13 described in the conventional technique. It is composed of a fitting portion 33 and a connecting portion 34. Here, a taper portion 33C is formed on the outer peripheral side of the fitting portion 33, the diameter of which expands from the mounting portion 33B toward the intermediate cylindrical portion 32 side. The tapered surface portions 39B and 43B of 42 are engaged with each other. A hose 25 is connected to the connecting portion 34 of the rubber boot 31 via a joint 24.

Reference numeral 35 denotes an annular groove which is located at an axially intermediate portion of the mounting portion 33 B and is formed on the outer peripheral surface of the fitting portion 33 over the entire circumference, and 36 is opposed to the annular groove 35 in the radial direction. The annular protrusion 36 formed on the inner peripheral surface of the fitting portion 33 is elastically deformed when the rubber boot 31 is fitted to the connecting pipe 7 of the relay pipe 4, and the annular protrusion 7D of the connecting pipe 7 is formed. The rubber boot 31 is prevented from slipping over and engaging with the outer peripheral side of the middle diameter portion 7B of the connecting pipe 7.

Reference numeral 37 denotes a fastener which is mounted on the mounting portion 33 B of the rubber boot 31 and constitutes a hose coupling together with the rubber boot 31, and the fastener 37 is a pair of clamp halves 38, 42, which will be described later. It is composed of a connecting bar 47, a cam lever 51 and the like.

Reference numeral 38 denotes one clamp half body, 39 denotes an arc portion forming a main body portion of the clamp half body 38, and the inner peripheral surface 39 A of the arc portion 39 is the mounting portion 33 B of the rubber boot 31. Is formed in a semi-circular shape with a curvature corresponding to the outer peripheral surface of the inner peripheral surface of the inner peripheral surface of the inner peripheral surface of the inner peripheral surface of the inner peripheral surface 39A, and a tapered surface portion 39B is formed at the axial end portion of the inner peripheral surface 39A. A connecting portion 40 and a hinge portion 41, which will be described later, are formed on the one end side and the other end side of the circular arc portion 39 so as to project in the radial direction.

Reference numeral 40 denotes a flat plate-like connecting portion integrally formed by bending one end side of the circular arc portion 39 outward in the radial direction, and the connecting portion 40 has a rectangular shape in the thickness direction at the center thereof. Square holes 40A are provided. Further, a sliding contact surface 40B, which is in sliding contact with a cam portion 52 of a cam lever 51 described later, is formed in a concave curve on the outer surface of the connecting portion 40, and the sliding contact surface 40B has a portion communicating with the square hole 40A. It is the deepest part.

Reference numeral 41 denotes a hinge portion integrally formed on the other end side of the circular arc portion 39. The hinge portion 41 projects in the direction opposite to the connecting portion 40 as shown in FIG. As shown in FIG. 2, it is formed with a plate thickness of about 1/3. A shaft hole 41A is formed in the hinge portion 41 in the plate thickness direction (axial direction of the rubber boot 31), and a pin 46 described later is inserted into the shaft hole 41A.

Reference numeral 42 denotes another clamp half body which is paired with the clamp half body 38. The clamp half body 42 is substantially the same as the clamp half body 38 and has an inner peripheral surface 43 A and a taper half. An arc portion 43 having a curved surface portion 43B, a connecting portion 44 provided at one end side of the arc portion 43 and having a square hole 44A formed therein, and a bifurcated end portion formed at the other end side of the arc portion 43. It is composed of the change parts 45, 45. Here, as shown in FIGS. 4 and 5, a pin fitting hole 44B is formed in the connecting portion 44 of the clamp half body 42 so as to be orthogonal to the square hole 44A, and the pin fitting hole 44B has a pin fitting hole 44B. A pin 48, which will be described later, that connects the connecting bar 47 is press-fitted into the square hole 44A.

As shown in FIG. 2, each hinge portion 45 is formed in a bifurcated shape so that the hinge portion 41 of the clamp half body 38 is sandwiched between the hinge portions 45. A shaft hole 45A corresponding to the shaft hole 41A of the hinge portion 41 is formed. Then, a pin 46 is inserted into the shaft holes 41A, 45A of each of the hinge portions 41, 45, 45, and the pin 46 rotatably pin-connects the clamp halves 38, 42.

Reference numeral 47 denotes a connecting bar as a connecting member, and the connecting bar 47 has a rectangular plate shape having a width dimension and a plate thickness dimension that can be inserted into the square holes 40A, 44A of the respective connecting portions 40, 44. As shown in FIG. 4, the connecting bar 47 is provided with a pin insertion hole 47A on the base end side and a screw insertion hole 47B on the tip end side in the plate thickness direction. Then, the connecting bar 47 is inserted at its base end side into the square hole 44A of the connecting portion 44 of the clamp half body 42 so as to form the pin fitting hole 44B of the square hole 44A and the pin insertion hole 47A of the connecting bar 47. By inserting the pin 48, it is pin-connected to the connecting portion 44. The tip end side of the connecting bar 47 projects outward from the connecting portion 40 of the clamp half body 38 through the square hole 40A, and is screwed into the screw insertion hole 47B provided at the tip end of the connecting bar 47. A cam lever 51, which will be described later, is rotatably pin-connected via a nut 50.

Reference numeral 51 denotes a cam lever. The cam lever 51 is formed in a substantially elliptical shape, and a cam portion 52 having an outer peripheral surface serving as a cam surface 52A, and the cam portion 52 on the side opposite to the cam surface 52A. A lever portion 53 protruding in a rod shape from 52 is generally configured. Here, the cam portion 52 is formed in a U-shaped cross section as shown in FIG. 4, and a concave groove portion 52B for inserting the tip end portion of the connecting bar 47 is provided at the center of the cam surface 52A. Further, a shaft hole 52C is formed in the cam portion 52 at a position eccentric to the cam surface 52A, and a tip end portion of the connecting bar 47 has a screw insertion hole 47B of the connecting bar 47 and a shaft hole 52C of the cam portion 52. It is rotatably pin-connected to the and via a screw 49 and a nut 50. The cam lever 51 rotates the lever portion 53 from the outside, whereby the cam surface 52A of the cam portion 52 slides on the sliding contact surface 40B of the connecting portion 40, and the separation dimension G between the connecting portions 40 and 44 is reduced. Change as shown in FIGS.

The hose coupling according to this embodiment has the above-described structure, and its operation will be described below.

First, similarly to the prior art, the rubber boot 31 is pushed toward the connecting pipe 7 of the relay pipe 4 in the direction of arrow A shown in FIG. 3 to connect the annular protrusion 36 of the rubber boot 31 as shown in FIG. The annular projection 7D of the tube 7 and the large diameter portion 7A are elastically engaged with the outer peripheral side of the medium diameter portion 7B. At this time, the fastener 37 previously attached to the rubber boot 31 pulls the lever portion 53 of the cam lever 51 toward the relay pipe 4 so that the clamp halves 38 and 42 are separated from each other between the coupling portions 40 and 44. As the dimension G becomes large, and as illustrated in FIG. 5, in one clamp half body 38, the inner peripheral surface 39A of the arc portion 39 is separated from the mounting portion 33B of the rubber boot 31 in the radial direction. The joint portion 33 can be allowed to expand in the radial direction, and the rubber boot 31 can be easily attached to and detached from the connecting pipe 7.

Then, after fitting the rubber boot 31 to the connecting pipe 7, the lever portion 53 of the cam lever 51 is rotated about half a turn in the direction of arrow B in FIG. 3 to rotate the cam of the cam portion 52. Since the surface 52A is formed eccentrically with respect to the screw 49, the cam surface 52A of the cam portion 52 connects the connecting portion 40 of the clamp half body 38 to the connecting portion of the clamp half body 42 via the sliding contact surface 40B. While pressing to the 44 side, the connecting portion 44 of the clamp half 42 is pulled toward the connecting portion 40 side via the connecting bar 47. As a result, the separation dimension G can be reduced between the connecting portions 40, 44 of the clamp halves 38, 42, and the clamp halves 38, 42 can be brought closer to each other, and the rubber boots can be provided between the arc portions 39, 43. 31 is strongly clamped from the outside in the radial direction to obtain the state of FIG.

Thus, in the hose coupling of the present embodiment, each clamp having a semi-circular curved shape corresponding to the outer peripheral surface of the rubber boot 31 and having thick plate-shaped connecting portions 40 and 44 at one end side, respectively. The half halves 38, 42 are rotatably pin-coupled to each other at the other end side, and the base end side is pin-coupled with a pin 48 to the coupling part 44 of the clamp half halves 42 between the coupling parts 40, 44. , A connecting bar 47 having a tip side protruding from the connecting portion 40 of the clamp half body 38 through the square hole 40A, and a cam lever 51 having a cam portion 52 pin-connected to the protruding end side of the connecting bar 47. . Then, by rotating the lever portion 53 of the cam lever 51, the connecting portion 40 of the clamp half body 38 is forcibly approached to the connecting portion 44 side of the clamp half body 42 via the connecting bar 47, The distance G between the connecting portions 40 and 44 is reduced so that the fitting portion 33 of the rubber boot 31 is sandwiched between the arcuate portions 39 and 43, so that the following advantageous effects can be obtained.

That is, the cam lever 52 of the tightening device 37 can easily perform the tightening or releasing operation on the rubber boot 31 by the clamp half-split bodies 38 and 42 only by rotating the lever portion 53 about half a turn. Compared to tightening screw 22 by rotating handle 23 many times as in the case of fastener 17 of the prior art, hose connection and disconnection work can be performed extremely quickly, requiring no extra labor. It can be lost.

Further, since the rubber boot 31 can be tightened only by rotating the cam lever 51, the operation amount of the lever portion 53 can be reduced, and the rubber boot 31 can be fitted with a small force so as not to come off due to water pressure or the like. It is possible to securely tighten the joint portion 33 to the connecting pipe 7, and it is possible to solve the problem that the tightening strength varies among individuals.

Further, the rubber boot 31 is formed with a taper portion 33C on the other side of the mounting portion 33B, and the arcuate portions 39 and 43 of the respective clamp halves 38 and 42 are engaged with the taper portion 33C. , 43B are provided, when the rubber boot 31 is tightened by the fastener 37, axial deformation of the rubber boot 31 can be appropriately escaped by the taper portion 33C and the taper surface portions 39B, 43B. It is possible to prevent early damage to the part 33A and the like.

Further, the fitting portion 33 of the rubber boot 31 is formed with the annular groove 35 in the mounting portion 33 B on the outer peripheral side, and the annular protrusion 36 is formed inside so as to face the annular groove 35. When the fastener is fastened to the connecting pipe 7 by the fastening device 37, the annular projection 36 comes into close contact with the medium diameter portion 7B of the connecting pipe 7, and the annular projection 7D of the connecting pipe 7 can securely prevent the rubber boot 31 from coming off. By providing the annular groove 35 and the annular projection 36, the mounting portion 33B is fastened by the fastening device 37, and the fitting portion 33 tries to be deformed in the axial direction. And 36, and the rubber boot 31 can be fitted into the connecting pipe 7 in a liquid-tight manner.

It should be noted that, in the above-mentioned embodiment, it was described that one of the clamp halves 38 is formed on the outer surface of the connecting portion 40 to form the concave curved sliding contact surface 40B. It is not always necessary to form the concave portion 40B in a concave curved shape. For example, even when the sliding contact surface 40A is formed as a flat surface, it is possible to obtain substantially the same action and effect as in the above embodiment.

[0041]

[Effect of device]

 As described in detail above, according to the present invention, the fastener is formed in a semicircular shape with a curvature corresponding to the fitting portion of the rubber boot, and one end side is a connecting portion that is separated from each other, and the other end side is A pair of clamp halves pivotally connected to each other and a pair of clamp halves are located between the connecting portions of the respective clamp halves, and the base end side is pin-connected to one connecting portion and the tip end side is the other connecting portion. Of the rubber boot, the connecting member protruding outward from the connecting member is rotatably pin-connected to the protruding end side of the connecting member, and the other connecting portion is pushed toward the one connecting portion. Since the fitting part is composed of a cam lever that clamps it between the clamp halves from the outside in the radial direction, you can easily tighten and release the rubber boots simply by rotating the cam lever of the fastener. You can connect and disconnect the hose quickly. Ukoto can. Further, since the tightening can be performed only by rotating the cam lever, a small amount of operation is required, and the rubber boot can be securely tightened so as not to come off due to water pressure or the like even with a small force. It

[Brief description of drawings]

FIG. 1 is an external view showing a state in which a hose coupling according to an embodiment of the present invention is connected to a connecting pipe.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is an external view showing a state before connecting the hose coupling of this embodiment to a connecting pipe.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

5 is a sectional view taken along the line VV in FIG.

FIG. 6 is an overall view showing a vehicle provided with a dirty water tank and a relay pipe according to a conventional technique.

FIG. 7 is an enlarged cross-sectional view taken along line VII-VII in FIG.

FIG. 8 is a vertical sectional view showing a state in which a hose coupling according to a conventional technique is connected to a connecting pipe.

9 is an enlarged cross-sectional view taken along arrow IX-IX in FIG.

[Explanation of symbols]

 7 Connection pipe 25 Hose 31 Rubber boot 33 Fitting part 34 Connection part 37 Fastener 38,42 Clamp half body 40,44 Connection part 47 Connecting bar (connection member) 52 Cam lever

Claims (1)

[Scope of utility model registration request] 1. A tubular rubber boot, one end of which is a fitting portion that is detachably fitted to a connecting pipe, and the other end of which is a connecting portion that is connected to a hose, and the rubber boot is attached to the fitting portion of the rubber boot. , A coupling for a hose comprising a fastener for fastening the rubber boot to the connecting pipe by fastening the fitting portion from the outside, wherein the fastener has a curvature corresponding to the fitting portion of the rubber boot. It is formed by bending into a semicircular shape,
A pair of clamp halves, one end of which serves as a connecting portion spaced apart from each other and the other end of which is rotatably pin-coupled to each other, and one connecting portion having a base end located between the connecting portions of the clamp halves. A connecting member that is pin-connected to the connecting member, the tip side of which protrudes outwardly from the other connecting portion, and is rotatably pin-connected to the protruding end side of the connecting member so that the other connecting portion faces the one connecting portion. A coupling for a hose, comprising a cam lever that presses the fitting portion of the rubber boot between the clamp halves from the outside in the radial direction.