JPH0540686U - Coil tube for piping - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a coil tube for piping that has little slack even after repeated expansion and contraction. [Structure] A plurality of synthetic resin tubes 11, ... Are wound in a coil shape, and the contact portions of these tubes are joined and integrated to form a coil-shaped metal wire 13 and a recess 14 formed by joining. Wrap it tightly around. [Effect] Due to the elastic force of the metal wire, there is little slack in the coil tube even after repeated expansion and contraction many times.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil tube for piping for supplying a pressure fluid to a fluid device.

[0002]

[Prior Art]

 As shown in FIG. 4, a coil tube 2 for piping in which a plurality of synthetic resin tubes 1 ... Is wound in a coil shape and the contact portions of these tubes are joined together to form a pipe is already known. .. The coil tube 2 for piping has an advantage that the piping can be easily expanded and contracted in the length direction because a plurality of tubes 1, ... Since the restoring force of the tube is weak, if it is repeatedly expanded and contracted or left in a stretched state for a long time, it will plastically deform and will not return to its original state, resulting in slack. Especially, the coil tube 2 is installed horizontally. Sagging is remarkable in some cases. The slack of the coil tube not only hinders the work, but also may cause a part of the device to be caught during the expansion and contraction operation to hinder the operation. Therefore, it is desirable to eliminate the slack.

[0003]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to provide a coil tube for piping in which slack does not easily occur even after repeated expansion and contraction many times.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is a coiled tube for piping in which a plurality of synthetic resin tubes are wound in a coil shape and the contact portions of these tubes are joined together to form a coiled metal wire. Is tightly wound around the recess formed by joining the tubes.

[0005]

[Action]

 The elastic force of the metal wire tightly wound around the recess of the coil tube increases the restoring force of the coil tube, making it difficult for slack to occur even after repeated expansion and contraction many times. Further, since the metal wire is tightly wound around the recess formed by joining the tubes, the metal wire is prevented from being detached due to repeated expansion and contraction of the coil tube.

[0006]

【Example】

 1 and 2 show an embodiment of the present invention. This coil tube 10 for piping is composed of a plurality (5 in the figure) of synthetic resin tubes 11 ... The tube bundle 12 is the same as the conventional one in which the contact portions of the respective tubes 11, ... Are joined and integrated, and the metal wire 13 formed into a coil shape of the present invention. .. are tightly wound along the coil-shaped recess 14 formed by joining. Reference numeral 16 in the drawing denotes a metal fitting attached to the non-joint portions at both ends of the coil tube bundle 12 to prevent the loosening. The metal wire 13 is formed into a coil-like dimensional shape that closely adheres to the outer peripheral recess of the coil tube bundle 12, and its elastic force assists the restoring force of the tube bundle 12 to prevent slack. The restoring force can be adjusted by appropriately selecting the diameter, the material, and the like.

Since the restoring force of the coil tube 10 is assisted by the elastic force of the metal wire 13, the coil tube 10 is less likely to sag even when it is repeatedly expanded and contracted many times. In addition, since the metal wire 13 is closely wound along the concave portion 14, there is no slippage between the metal wire 13 and the tube bundle 12, so that there is no influence of bending on each other and the coil tube 10 expands and contracts repeatedly. The metal wire 13 is never detached. Although the metal wire 13 is wound around the recess 14 on the outside of the coil tube 10 for piping in the above embodiment, it may be wound around the recess on the inside. Further, as in the modified example shown in FIG. 3, the metal wire 13 may be fixed by the binding band 17 during coil formation.

[0008]

[Effect of the device]

 According to the present invention, since the restoring force of the coil tube is assisted by the metal wire wound around the recess of the coil tube for piping, even if it is repeatedly expanded and contracted many times, it does not sag. In addition, by tightly winding the metal wire in the recess, the metal wire expands and contracts integrally with the coil tube, so the metal wire does not detach due to expansion and contraction of the coil tube, improving workability and smooth operation. Is obtained.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment.

FIG. 2 is a sectional view of a main part.

FIG. 3 is a front view of a main part of a modified example.

FIG. 4 is a front view of a conventional coil tube.

[Explanation of symbols]

 10 Piping Coil Tube 11 Synthetic Resin Tube 13 Metal Wire 14 Recess

Claims (1)

[Scope of utility model registration request] 1. A coil tube for piping, which comprises winding a plurality of synthetic resin tubes in a coil shape and joining the contact portions of these tubes into one piece, wherein a metal wire formed in the coil shape is joined to the tube. A coil tube for piping, which is tightly wound around the recess formed by.