JP2000304185A - Water supply hose fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a tightening operation by slight force by inclining a side edge on a rear end part side of a tightening operating ring so as to gradually increase a semi-circular ring groove width of a bearing hole of the tightening operating ring from a required spot on one side semicircle part side of the tightening operating ring between each hook stop pawl to a center spot of the other side semicircle part. SOLUTION: A side edge on a rear end side of a tightening operating ring 2 is inclined to slight inclination of about 2 deg. so as to increase the groove width from spots P, Q on one side semicircle part S side of the tightening operating ring 2 between each hook stop pawl 3, 3 to a center spot m' of a semicircle part S' on the other side. Therefore, backlash of a bearing ball 10 is increased in a ring mechanism 9 on one side semicircle part S' side increasing the groove width. By inclining the tightening operating ring 2 in a tip direction of the tightening operating ring 2 for fitting cylinders 1 with a spot P, Q, or M as a center when the fitting cylinders 1, 1 are joined each other, a position of a sliding contact surface 4b of each hook stop pawl 3, 3 is displaced to a tip front of the tightening operating ring 2, space between the position and a rear surface of a wedge projecting streak is increased and a tightening operation is smoothed and facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply hose joint such as a fire hose, and more particularly to a water supply hose joint in which a large drawing pressure acts in the axial direction due to the flow of high-pressure water.

[0002]

2. Description of the Related Art As a conventional water supply hose joint, a ring-shaped fastening operating ring is rotatably fitted to the outer periphery of a pair of joint cylinders which are joined and fastened to each other. Hook-shaped hook claws with the inner concave portions U facing each other and projecting forward from the front end of each joint tube, and wedge protrusions extending in a circumferential direction to the outer periphery between the hook claws so as to extend horizontally in a wedge shape. A wedge ridge of the other joint cylinder is fitted into the inner concave portion of the hook and pawl of one of the joint cylinders, and the joining surface formed by bending from the top of the vertical wall of the inner concave portion is connected to the wedge ridge. There has been known a water supply hose joint in which the joint cylinders are joined and fastened by pressing against an inclined surface increasing in height from the end of the fastening operation ring from the front end formed on the rear surface to the rear end in the circumferential direction. (Japanese Utility Model No. 63-37593).

[0003]

The problem to be solved is that when the joint cylinders are joined and fastened together, the sliding surfaces of the hook claws and the wedge ridges are strongly pressed together over the entire surface. For this reason, frictional resistance is large and tightening is not easy.

[0004]

According to the present invention, a semicircular ring groove of a bearing ball of a fastening operating ring is provided between a point on one side of the fastening operating ring between the hooks and a half circumferential portion on the other side of the fastening operating ring. The most important feature is that the side edge on the rear end side of the fastening operation ring is formed with a slight inclination in the front and rear directions so as to gradually increase the groove width toward the center point.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Fastening operating ring 2 between hooks 3, 3
From the points P, Q (one point of the center point M, not two points) on the half-peripheral portion S side to the central point M 'of the other half-peripheral portion S', so that the groove width is gradually increased. The side edge on the rear end side of the ring 2 is formed to be inclined at a slight inclination θ of about 2 °.

Accordingly, in the ring groove 9 on the one-sided semi-peripheral portion S 'where the groove width increases, the backlash of the bearing ball 10 is large, and when the joint cylinders 1 and 1 are joined together, the fastening operation ring 2
Is tilted with respect to the joint cylinder 1 about the point P, Q or M in the direction of the distal end of the fastening operation ring 2 so that the position of the sliding contact surface 4b of the hook claws 3, 3 is more tightened than before tilting. The wedge ridge 5 is displaced forward in the front end of the working ring 2 to form a rear surface 5a.
And smoothing and facilitating the fastening operation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. A fastening operating ring 2, which is similarly cast and formed in a circular shape, is rotatably fitted on the outer periphery of a joint cylinder 1 which is formed into a cylindrical shape by precision casting or the like. Have been combined.

A pair of hook claws 3, 3 each formed in a hook shape are formed on the outer periphery of the fastening operation ring 2 so that their hook-shaped inner concave portions 4 face each other in the radial direction, and the leading end of the joint tube 1 is formed. And a wedge protrusion protruding toward the front of the joint end face of the hooking claw 3 and extending along the tightening rotation direction (clockwise rotation) of the fastening operation ring 2 on the outer periphery of both half circumferential portions between the roots of the hook claws 3. Articles 5 and 5 are formed.

The inner concave portion 4 of the hook claw 3 is formed in a hook shape by a vertical wall 4a that rises substantially at a right angle from the tip end surface of the fastening operation ring 2 and a sliding contact surface 4b that is bent in the opposite direction from the top end thereof. The sliding contact surface 4b has a downward inclination of about 20 ° toward the distal end surface of the fastening operating ring 2 so that the height from the distal end surface of the fastening operating ring 2 gradually decreases from the base end to the distal end. The sliding contact surface 4b has a height from the distal end surface of the fastening operation ring 2 toward the tightening rotation direction (right rotation) of the fastening operation ring 2. It is formed on an upwardly inclined surface (hereinafter referred to as a circumferentially inclined surface) that is inclined so as to gradually increase.

An arcuate surface R is formed at the intersection between the vertical wall 4a and the sliding surface 4b.

The wedge ridges 5, 5, when the pair of connecting cylinders 1, 1 are brought into contact with each other via an annular packing 6 fixed to the end thereof, each hook claw 3, which protrudes from the other connecting cylinder 1.
A gap 7 through which the mating hook 3 can freely enter and exit is provided between the tip of the hook 3 and the hook 3 adjacent thereto. ing.

The rear surface 5a of the wedge ridge 5 (the surface directed toward the rear end of the fastening ring 2) has a height from the front end surface of the fastening ring 2 from the front end to the rear end in the circumferential direction. The sliding surface 4b of each of the hook claws 3 is formed on an inclined surface having the same gradient in the same direction as the left-right inclined surface (hereinafter referred to as a circumferential inclined surface) so as to gradually increase. From the peripheral edge to the inner peripheral edge (toward the center of the cylinder of the binding operating ring 2), the front and rear inclination of the joining surface 4 b of each of the hook claws 3 so as to gradually decrease the height from the tip end surface of the fastening operating ring 2. Inclined surface with the same gradient in the same direction as the surface (hereinafter referred to as radially inclined surface)
Is formed.

The height of the rear surface in the vicinity of the tip of the wedge ridge 5 is such that, when the joint cylinders 1 and 1 are brought into contact with each other via the packing 6 at the tip thereof, the hooks project from the fastening operation ring 2 of the other party. The height is set so as to have a sufficient level difference with respect to the sliding contact surface 4b of the claw 3 so that the hook 3 can be engaged with a sufficient margin in the inner concave portion 4 at the start of engagement.

In order to smoothly turn the fastening ring 2 with respect to the joint cylinder 1, ring grooves 8 and 9 each having a semicircular cross section facing each other are formed on both rotating and sliding surfaces. A large number of bearing balls 10 are loaded between the ring grooves 8 and 9.

As shown in FIG. 4, the ring groove 9 of the fastening operation ring 2 has a semicircular portion S on one side of the fastening operation ring 2 between the hooks 3.
The rear end of the fastening operating ring 2 so as to gradually increase the groove width from the side points P and Q (not the two points but one point of the center point M) to the center point M 'of the half-circumferential portion S' on the other side. Side edge is formed to be inclined at a slight inclination θ of about 2 °.

Therefore, in the ring groove 9 on the one-sided semi-peripheral portion S 'side where the groove width increases, the play of the bearing ball 10 is large, and the fastening operation ring 2 is moved with respect to the joint cylinder 1 around the point P, Q or M. By tilting in the direction of the distal end of the engagement operating ring 2, the position of the sliding contact surface 4 b of the hook claws 3 can be displaced forward of the distal end of the engagement operating ring 2 from the state before the inclination.

On the other hand, a water supply hose 13 formed by laminating a synthetic rubber tube 11 as an inner layer and a cloth layer 12 as an outer layer is inserted into the inside of the joint tube 1, and its outer periphery is formed with a saw blade. The distal end of the joint 14 is pinched and sealed by a rubber packing 16 fitted in an inner bottom ring groove 15 provided on the inner periphery of the distal end of the joint tube 1.

The rubber packing 16 is provided at its rear end with pressure lips 17 and 18 having a double inner and outer circumscribing, and the distal end of the water supply hose 13 is fitted into a ring-shaped clamping groove formed therebetween. It is stuck.

Then, the water supply hose 13 and the rubber packing 1
An expansion ring 19 made of metal such as brass is fitted to the inner peripheral surface of the inner ring 6, and the water supply hose 13 is expanded by expanding the expansion ring 19 from the inside toward the hooking step 14.
At the same time, the rubber packing 1
6 is pressed against and adhered to the inner bottom ring groove 15 to seal it. Further, both the clamping lips 17 and 18 and the distal end of the water supply hose 13 are pressure-bonded and sealed. The water supply hose 13 is completely prevented from being pulled out or separated by the high pressure.

When the connecting cylinders 1 and 1 constructed as described above are fastened and joined to each other, the hooking claw 3 and the front end of the wedge projection 5 in the fastening operating ring 2 of one of the connecting cylinders 1 are used. When the hook claws 3 protruding from the fastening operation ring 2 of the other joint cylinder 1 are aligned with the position of the gap 7 of the other joint, the joint cylinders 1 and 1 are brought into contact with each other and Each of them is located on the outer periphery of the mating operating ring 2.

In this state, when the opposing fastening operation rings 2 and 2 are relatively rotated in the direction of the tips of the wedge ridges 5 and 5, the respective wedge ridges 5 and 5 are engaged with the other claws 3 and 3. And the sliding contact surface 4b of the hook claw 3 is pressed against the rear surface 5a as the sliding contact surface 4b slides along the circumferentially inclined surface of the rear surface 5a of the wedge ridges 5, 5. Hand joint tube 1,1
The parts are fastened in a relative direction, and are tightly joined and joined via packings 16 and 16.

On the other hand, when the fastening operation rings 2 and 2 are joined, the fastening operation ring 2 is moved to the above-mentioned point as shown in FIG. The position of the sliding contact surface 4b of the hook claws 3 is inclined by tilting the joint ring 1 with respect to the joint cylinder 1 with respect to P, Q or M as shown by a dashed line in FIG. By displacing the front end of the engagement ring 2 forward from the previous state and slightly widening the space between the rear surface 5a of the wedge ridge 5 and the sliding surface 4b of the hook claw 3 and the rear surface 5a of the wedge ridge 5, The frictional resistance is reduced so that the hook 3 and the wedge ridge can be easily and smoothly engaged, and the joining operation by the rotation of the fastening operating rings 2 can be performed lightly with a small force.

When water supply to the water supply hose 13 is started at a high pressure after the joint cylinders 1 and 1 are joined, the opposite joint cylinders 1 and 1 are pulled in mutually opposite directions, so that the groove width of the joint cylinder 1 is the same. The bearing ball 10 is engaged with the horizontal side edge of the ring groove 8 formed at the front end, and the fastening operation ring 2 is returned to the position before the inclination so that the sliding contact surface 4b of the hook claw 3 is rearward of the wedge ridge 5. Since the contact cylinders 1 and 1 are pressed against each other, the joint cylinders 1 and 1 maintain a strong fastening state.

[0024]

As described above, according to the present invention, at the time of joining and fastening the joint cylinders, the fastening operation ring is rotationally fastened while slightly tilting using the groove width (play) of the ring groove whose inclination changes. The fastening operation can be performed lightly with a small force.

[0025]

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional side view showing an embodiment of a water supply hose joint of the present invention.

FIG. 2 is a side view of the water supply hose joint of the present invention.

FIG. 3 is a front view of the water supply hose joint of the present invention.

FIG. 4 is a vertical sectional side view of a fastening operation ring of the water supply hose joint of the present invention.

FIG. 5 is a side view of a fastening operation ring of the water supply hose joint of the present invention.

FIG. 6 is a side view showing the water-supply hose joint of the present invention in a joined and fastened state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint cylinder 2 Fastening operating ring 3 Hook claw 4 Inner recess 4a Vertical surface 4b Sliding contact surface 5 Wedge ridge 5a Back surface 6 Packing 7 Gap 8 Ring groove 9 Ring groove 10 Bearing ball 11 Rubber layer 12 Cloth layer 13 Water supply hose 14 Engagement step 15 Inner bottom ring groove 16 Rubber packing 17 Clamping ring 18 Clamping ring 19 Expansion ring S Half circumference S 'Half circumference

Claims (1)

[Claims] 1. A ring groove of a ball bearing of a fastening operating ring rotatably fitted to an outer periphery of a joint cylinder, and a semi-circular portion on the other side from a point on one half peripheral portion of the fastening operating ring between the hooks and claws. A water supply hose joint characterized in that a side edge on a rear end side of the fastening operation ring is formed to be slightly inclined so as to gradually increase a groove width toward a center point of the water supply hose.