JPH074388Y2 - Universal pipe joint core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is rotatably inserted into a spherical shell-shaped bulging portion of a tubular body,
The present invention relates to a universal joint core that constitutes an adjustable universal joint.

(Prior Art) As a conventional core for a universal joint, for example, the actual open core 53-
What is used for the universal pipe joint described in 28521 is known.

This conventional core has an outer peripheral surface formed into a spherical shape along the inner peripheral surface of the spherical shell-shaped bulging portion of the tubular body, and has a receiving portion into which a synthetic resin pipe is inserted, which is a solid molding. It was of structure.

Further, in Japanese Utility Model Laid-Open No. 60-51381, a rubber ring seal type free type that secures a seal with a pipe to be connected by a rubber ring member fitted in an annular groove formed on the inner peripheral surface of a spherical core member is disclosed. The fitting is described.

(Problems to be solved by the invention) However, in the conventional core in which the space between the outer peripheral surface of the core and the inner peripheral surface of the receiving portion is thus solid, not only the weight is heavy but also the injection molding is performed. It also requires a long cooling time. In particular, in the case of molding using a resin material such as vinyl chloride resin having a property that the melting temperature and the decomposition temperature are close to each other, the central part where the core thickness is maximum is carbonized by thermal decomposition, or There is a problem that sink marks and dimensional defects occur due to insufficient cooling.

In addition, the rubber ring seal type universal joint described in Japanese Utility Model Laid-Open No. Sho 60-51381 has a problem that the ground surface is lifted due to freezing during construction in cold regions and the connected pipes fall out. It was

Furthermore, when mounting the conventional core on the inner peripheral surface of the spherical shell-shaped bulging portion, the central axis of the core and the central axis of the spherical shell-shaped bulging portion must be forcibly fitted from a direction perpendicular to each other. In the worst case, there was a problem that the spherical shell-shaped bulging portion was damaged.

INDUSTRIAL APPLICABILITY The present invention can reduce the weight and the cooling time at the time of molding, and has a high dimensional accuracy, a high sealing performance, and an easy-to-fit adhesive receptacle into a spherical shell-shaped bulge. The purpose is to provide a type of universal joint core.

(Means for Solving the Problems) In order to achieve the above object, the universal pipe joint core of the present invention is rotatably attached to a spherical shell-shaped bulge portion formed at the pipe end portion of the pipe body. In the synthetic resin universal pipe joint core, which is inserted, the outer peripheral surface is formed in a spherical shape along the inner peripheral surface of the bulging portion, and in which the adhesive receiving portion into which the synthetic resin pipe is inserted is formed, The core is divided into a core body and a core cap, and the core body has an annular groove on the outer periphery of the receiving portion side and a rubber ring mounted in the annular groove formed on the outer periphery of the bulging portion base end side. When the core cap is mounted and joined to the core body, an annular hollow portion is formed between the core body and the core cap and between the core outer peripheral surface and the receiving portion inner peripheral surface. It is what

(Operation) In the core for a universal joint of the present invention, a hollow portion is formed between the outer peripheral surface of the core and the inner peripheral surface of the receiving portion, and this hollow portion serves as a meat stealing portion. Can be realized. Furthermore, when the core is fitted into the spherical shell-shaped bulging portion, since the hollow portion exists, the core cap can be easily bent, and the spherical shell-shaped bulging portion is not damaged. Also, the core is divided into a core body and a core cap,
Since it has a structure in which the core cap is attached and joined to the core body, it can be molded separately, the cooling time at the time of molding can be shortened, and moreover, the strain due to sink marks and cooling can be prevented. .

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

First, the structure of the embodiment shown in FIGS. 1 and 2 will be described.

As shown in FIG. 2, the universal pipe joint core 1 according to the present embodiment has a spherical shell-shaped bulging portion 21 formed at the pipe end portion of the pipe body 2.
It is a component of a universal pipe joint that is rotatably inserted in and has an adjustable angle, and is injection-molded with a synthetic resin material such as a hard vinyl chloride resin.

Further, as shown in FIG. 1, the core 1 has a core outer peripheral surface.
11 is formed into a spherical surface along the inner peripheral surface of the bulging portion 21 of the tubular body 2, and the end portion of the synthetic resin pipe 3 is inserted thereinto.
12 are formed. A step is provided at the rear end of the inner peripheral surface 13 of the receiving part, and a stopper 14 for restricting the insertion position of the synthetic resin pipe is formed by this step.

Further, the core 1 has a core body 1a having a groove 15 on the outer circumference.
And a core cap 1b provided outside the concave groove 15, the concave groove 15 and the core cap of the core body 1a.
A hollow portion 17 is formed with the inner peripheral surface 16 of 1b.

Further, a stepped portion 18b that can be engaged with the stepped portion 18a of the core body 1a is formed at the rear end of the core cap 1b.
A mountain-shaped fitting protrusion 19b that can be fitted into the V-shaped fitting groove 19a of the core body 1a is formed at the open end of 1b. That is, the core cap 1b can be joined by forcibly fitting it to the core body.

The outer peripheral surface 11a of the core body 1a and the outer peripheral surface 1 of the core cap 1b are
1b is formed so as to be smoothly continuous.

Further, 4 is a rubber ring, which is the outer peripheral surface 11a of the core body 1a.
It is mounted in the annular groove 20 formed on the inner surface of the tube body 2 to keep the watertightness between the inner peripheral surface 22 of the bulging portion and the outer peripheral surface 11 of the core.

As described above, the universal pipe joint core 1 of the present embodiment
Is divided into a core body 1a and a core cap 1b, and since a hollow portion 17 is formed between the core outer peripheral surface 11 and the receiving portion inner peripheral surface 13, the hollow portion 17 is It becomes a stolen part, and it is possible to reduce material and weight.
Further, the core body 1a and the core cap 1b may be formed separately, and the cooling time at the time of molding can be shortened, thereby preventing the occurrence of sink marks and the distortion due to shrinkage.

The thicknesses of the core body 1a and the core cap 1b need to be set within a range that ensures strength.

FIG. 3 shows a universal pipe joint core 1 of the second embodiment. The core 1 of the present embodiment includes a core body 1a and a core cap 1b.
An adhesive is used as a means for connecting the members instead of fitting. Therefore, the joint surface of the core body 1a and the core cap 1b
The shapes of 23a and 23b can be simplified.

The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Regarding the operation, the description of the same operation as that of the first embodiment is omitted.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and even if there is a design change or the like within the scope not departing from the gist of the present invention, it is included in the present invention. Be done. For example, in the embodiment, the core is divided into the inside and the outside of the hollow portion, that is, divided in the radial direction and separately molded, but it may be divided in the axial direction, that is, the rear end side and the open end side.

Further, the shape of the hollow portion is not limited to the embodiment.

(Effects of the Invention) As described above, since the core for a universal joint of the present invention is stolen by the hollow portion, the material can be reduced and the weight can be reduced. Furthermore, when the core is fitted into the spherical shell-shaped bulging portion, since the hollow portion exists, the core cap can be easily bent, and the spherical shell-shaped bulging portion is not damaged.

Further, since the core is divided into a core body and a core cap, and the core cap is attached and joined to the core body, it may be molded separately, and the cooling time at the time of molding can be shortened. Moreover, it is possible to prevent the occurrence of sink marks, strain, and carbonization due to thermal decomposition.

Therefore, according to the universal joint core of the present invention, it is possible to obtain an adhesive receiver having excellent dimensional accuracy, higher sealing performance than a rubber ring seal type universal joint, and easy to fit into a spherical shell-shaped bulge. It is possible to obtain a mouth-type universal joint core.

[Brief description of drawings]

FIG. 1 is a sectional view showing a universal pipe joint core of a first embodiment of the present invention, FIG. 2 is a sectional view showing a universal pipe joint in which the core of the first embodiment is used, and FIG. 3 is a second embodiment. It is sectional drawing which shows the core for universal pipe joints of an example. 1 ... Core for universal joint 1a ... Core body 1b ... Core cap 11 ... Core outer surface 12 ... Receptacle part 13 ... Receptacle inner surface 17 ... Hollow part 2 ... Tube 21 ... Swelling part 22 ... Swelling part Circumference

Claims (1)

[Scope of utility model registration request] 1. A spherical shell-shaped bulging portion formed at a pipe end portion of a tubular body so as to be pivotally inserted, an outer peripheral surface of which is formed into a spherical shape along the inner peripheral surface of the bulging portion. Is a synthetic resin universal joint joint core in which an adhesive receiving portion into which a synthetic resin pipe is inserted is formed. The core is divided into a core body and a core cap, and the core body is on the receiving portion side. An annular groove is provided on the outer periphery, and a rubber ring is installed in the annular groove formed on the outer periphery of the bulging portion base end side. When the core cap is attached and joined to the core body, A core for a universal joint, wherein an annular hollow portion is formed between the core cap and the outer peripheral surface of the core and the inner peripheral surface of the receiving portion.