JPS5916624Y2 - Connection structure of rubber or synthetic resin connection pipe end - Google Patents

Description

[Detailed description of the invention] This invention prevents leakage during long-term use, and also prevents cracks caused by the twisting of the lower part of the head body caused by the pressure rotation of the nut due to the tightening caused by screw tightening. This relates to a connection structure for the end of a relatively small diameter rubber or synthetic resin connecting pipe with a diameter of about 30 mm or less, which is intended to prevent breakage, and the tip edge of the rubber or synthetic resin connecting pipe 1 has an outward bulge. The connecting head body 4 has a protruding bulge, and the outwardly bulging connecting head body 4 has an inner edge of the front edge with a pressing sheet surface 2 at the front end, and a shoulder surface 5 under the neck at the rear end. The inner edge of the rear edge is
The flat contact surfaces 3□, 3□ are configured to be in close contact with each other, and the rubber or synthetic resin connecting pipe 1 is fitted onto the shoulder surface 5 under the neck at the rear end of the bulging connecting head body 4. The end face of the tip flange 6 of the sleeve washer 7 that is tightly fitted is characterized by being crimped, and in this embodiment, the pressing seat surface 2 of the outwardly bulging connection head 4 has a flat or arcuate shape. It is formed on a planar inclined surface.

In the drawings, 8 indicates a tightening nut.

Conventionally, as shown in the longitudinal cross-sectional view of FIG. 5, this type of flexible hose end connection structure has been designed such that the front side is a pressing sheet surface 2' and the inner surface is attached to the tip of a rubber or synthetic resin connecting pipe 1'. It is known that a gap 9 is maintained between the side surfaces 31' and 32' and the head is bent to form a bulging connecting head 4'.

In this conventional structure, there is a risk that the bulging head body will be compressed and thinned due to the pinching pressure when the nut is screwed and tightened.
During long-term use, leakage occurs, and when the nut is tightened, the rear surface of the bulging head body is pressed and rotated, causing twisting in this part, which in turn causes cracks and breakage in that part.

In contrast, the invention of this application eliminates the drawbacks of this conventional structure.According to the invention of this application, leakage during long-term use is prevented, and the tightening associated with screw tightening is reduced. Cracks and damage caused by twisting of the lower neck portion of the head body caused by pressing and rotating the nut can be prevented.

Further, as a connection structure for metal pipes, a threaded portion is formed on the outer periphery of the end edge of one pipe, a cap nut is screwed into the threaded portion, and a through hole is formed in the end wall of the cap nut, Further, a flange that contacts the inner surface of the end wall of the cap nut is formed on the outer periphery of the tip of the other pipe to be inserted into the through hole by bending a double wall protruding outward from the peripheral wall of the other pipe, and It is conventionally known that a tapered part is formed on the outer circumferential surface of the tip of a pipe, and the diameter becomes smaller toward the tip so as to fit into the edge of one of the pipes.

In this conventionally known metal pipe connection structure, the flange that contacts the inner surface of the end wall of the cap nut is formed by bending a double wall protruding from the peripheral wall of the other pipe, so the tightening of the cap nut is time consuming. The pressure and rotation of the flange causes the flange in contact with the flange to twist, which often causes cracks and damage.

On the other hand, the invention of this application prevents thinning of the rubber or synthetic resin connecting tube by compressing the bulging connecting head by applying pressure when tightening the screw with a nut. According to the invention of this application, an outwardly bulging connection head body 4 is protruded from the tip edge of the rubber or synthetic resin connecting pipe 1, and the outwardly bulging connection is prevented from twisting. In the head body 4, the inner edge of the front edge where the pressing sheet surface 2 is provided at the front end and the inner edge of the rear end edge where the under-neck shoulder surface 5 is provided at the rear end are flat facing surfaces 31, 3□. At the same time, a tip flange of a sleeve washer 7 which is fitted and tightly attached to the rubber or synthetic resin connecting pipe 1 is attached to the shoulder surface 5 under the neck at the rear end of the bulging connecting head body 4. Due to the crimped end face of the rim 6, the special structure of its outwardly bulging connecting head;
By clamping a sleeve washer that fits tightly into the rubber or synthetic resin connecting pipe on the shoulder surface under the neck at the rear end of the outwardly bulging connecting head body, leakage during long-term use is prevented, and the screw The tightening that accompanies the joint tightening is extremely useful in that it can prevent cracks and damage caused by twisting of the lower neck portion of the head body caused by pressing and rotating the nut.

[Brief explanation of the drawing]

Figure 1 is a front view of this device, Figure 2 is a sectional view taken along line ■-■ in Figure 1, Figure 3 is a sectional view taken along line II--II in Figure 2, and Figure 4 is a longitudinal cross-section of this device in use. The plan view and FIG. 5 show a longitudinal sectional view of the conventional structure. In the figures, the same symbols indicate the same or equivalent parts, 1 is a rubber or synthetic resin connecting pipe, 2 is a pressed sheet surface, 3 □,
3 □ is a flat contact surface, 4 is a connecting head body, 5 is a shoulder surface under the neck, and 6 is a tip flange edge of the sleeve washer 7.

Claims (2)

[Scope of utility model registration request] (1) An outwardly bulging connecting head 4 is protruded from the tip edge of the rubber or synthetic resin connecting pipe 1, and the outwardly bulging connecting head 4 has a pressing sheet surface 2 at the front end. The inner edge of the provided front edge and the inner edge of the rear edge provided with the under-neck shoulder surface 5 at the rear end are configured to be in close contact with each other at the flat contact surfaces 31, 3□, Shoulder surface 5 below the neck at the rear end of the bulging connecting head body 4
2. A connection structure for an end of a rubber or synthetic resin connecting pipe, characterized in that the end face of the tip flange 6 of the sleeve washer 7 that is tightly fitted and tightly attached to the rubber or synthetic resin connecting pipe 1 is crimped. (2) The pressing sheet surface 2 of the outwardly bulging connection head body 4 is
A connecting structure for a rubber or synthetic resin connecting tube end according to claim (1), which is formed into a flat or arcuate inclined surface.