JPH0144837Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention supports a large number of flexible cables, hoses, etc. that supply electricity, gas, oil, etc. from a stationary part to a moving machine or a moving part of a machine. , concerning cable drag chains that provide protection and guidance.

BACKGROUND OF THE INVENTION Conventional cable drag chains made of plastic or die-cast are of an open type, and there is a risk that foreign objects may adhere to and damage the cables, hoses, etc. stored therein from the outside.

Problems that the invention attempts to solve The purpose of this invention is to produce plastic and die-casting materials.
To provide an integrally molded closed cable drag chain.

Means for Solving the Problems In this invention, frame-shaped links surrounded by upper and lower stay parts and offset link parts on both sides are connected so as to be bendable to each other at the connecting points of the link parts. The outer link parts on both sides and the front parts of the upper and lower stay parts are convex cylindrical surfaces centered on the connecting hole provided in the outer link part, and a concave opening toward the front surrounds the connecting hole on the inside of the outer link part. The inner link portions on both sides of the link portion form flexible tongues that slide into the recess, and have protruding pin portions on the outside that fit into the connecting holes, and the outer link portions on both sides and the upper and lower The rear part of the stay part is formed into a concave cylindrical surface with a slightly larger diameter than the convex cylindrical surface centered around the protruding pin part, and when the flexible tongue piece is inserted into the recess and the protruding pin part is fitted into the connecting hole, It is characterized by being able to bend between a position where the frame-shaped link forms a straight line due to the contact of the sides of the recess and the tongue piece and a predetermined angular position where the adjacent front and rear stay portions maintain overlap. .

Function When the flexible tongue piece is bent inward and inserted into the recess of the outer link part, and the protruding pin part is fitted into the connecting hole by the elasticity of the tongue piece to connect the frame-shaped links one after another, the adjacent frame links are connected one after another. The front and rear frame-shaped links can be bent between a straight position and a predetermined angular position by the contact of the respective side surfaces of the tongue and the recess, thereby providing a so-called no-back vent characteristic. At the predetermined angular position, the outer front and rear stay portions have cylindrical surfaces with small gaps and maintain overlapping, so there is no risk of foreign matter entering the frame link from the outside.

Embodiment FIGS. 1 to 6 show the structure of an example of a frame-shaped link 1. FIG. The frame-shaped link 1 is made by integrally molding the upper and lower stay parts 2, 3 for holding cables, etc., and the offset-type link parts 4 on both sides into a frame shape by die-casting plastic or aluminum, and the offset-type link part 4 has a high rigidity. It consists of a thick outer link part 5 and a flexible tongue piece 6 which is a thin inner link part. With the connecting pitch of the frame-shaped link 1 on the center line c of the link part 4, a connecting hole 7 and a protruding pin part 8 fitted into the connecting hole 7 are provided in the outer link part 5 and the outer surface of the tongue piece 6, respectively, and the stay part The front portions of the stay portions 2, 3 and the outer link portion 5 are formed into a convex semi-cylindrical surface 9 centered on the connecting hole 7, and the rear portions of the stay portions 2, 3 and the outer link portion 5 are formed on the protruding pin portion 8. The concave cylindrical surface 10 has a slightly larger diameter than the convex cylindrical surface 9.

A fan-shaped recess 11 is provided on the inner surface of the outer link part 5, surrounding the connecting hole 7 and facing forward and expanding in vertical dimension.
Angles α and β between the side surfaces 12 and 13 and the center line c
A difference is provided by a predetermined bending angle of the frame-shaped links 1 connected as described below.

When the protruding pin portion 8 is inserted into the connecting hole 7 as described above, both side surfaces 14 and 15 of the tongue piece 6 expand forward at an angle α with respect to the center line c, and the side surface 12 of the angle α
When and 14 come into contact, the frame-shaped link 1 forms a straight line, and the side surface 13 at the angle β and the side surface 15 at the angle α
(Fig. 6) When the frame-shaped link 1 is in contact with β
Bend at an angle of −α.

In order to make it easier to insert the tongue piece 6 into the recess 11, the recess 11 is provided with an inclined surface part 16 that expands outward, the outer surface of the protruding pin part 8 is formed into an inclined surface 17, and the rear end of the tongue piece 6 is formed on the outer side. A slope 18 is formed on the surface.

Stay part 2 that becomes the outer side when the frame link 1 is bent
The inner surface of is a plane parallel to the center line c, and its thickness is equal to that of the convex cylindrical surface 9 when the frame-shaped link 1 is bent.
is determined so as to maintain a sufficient overlapping dimension with respect to the concave cylindrical surface 10. In addition, as shown in FIG. 7, the inner surface of the stay portion 3, which becomes the inner side when bent, is
A curved surface 19 follows the curved inner surface of the stored cable K, etc., and a recess 21 is provided on the outer surface of the stay portion 3 to avoid interference with the rear end 20 of the concave cylindrical surface 10 when bent. .

The frame-shaped links 1 are connected to the required length using the connecting holes 8 and the protruding pins 9 as described above, and the mounting brackets 22 and 23 are connected to the front and rear ends with a similar connecting structure to form a cable drag chain. If a cable K etc. is inserted and supported through this, there will be a slight difference in radius between the concave cylindrical surface 10 and the convex cylindrical surface 9 between the stay parts 2 and 3 of the adjacent frame-shaped links 1. There is only a curved gap 24 corresponding to , and there is no risk of foreign matter entering the chain from the gap,
Cable K can be held in a nearly hermetically sealed state.

Figures 8a, b, and c show modified examples for minimizing the gap 24, and in figure a, the thickness of the rear end 20 of the concave cylindrical surface 10 is increased inward to make the gap 24 smaller. , b is a concave cylindrical surface 10 and a convex cylindrical surface 9
The gap 24 has a half-moon shape and the gap length at both ends is made small by having approximately the same radius and slightly shifting the center forward from the center of the protruding pin part 8, and c is a rear end instead of the concave cylindrical surface 10. The gap between the portions 20 is an ellipsoidal surface 10a with a slightly shortened gap, and the gap length at both ends is made small.

As described above, the cable drag chain of the present invention can be bent in one direction up to an angle of β-α at the maximum, and if it is bent further than this, there is a risk that the tongue piece 6 may escape inward from the fan-shaped recess 14. Figure 9a,
b and c indicate such escape prevention structures, and a indicates side surfaces 12 and 13 of the recess 11 and side surfaces 14 and 1 of the tongue piece 6.
5 is inclined in a dovetail fit shape, and pressing force is applied to the tongue piece 6 toward the recess 11 by bending force. C is the one in which a concavo-convex engaging part 26 is provided on the peripheral surface of the connecting hole 7 and the protruding pin part 8.

To uncouple the frame link 1, press the protruding pin part 8
may be pushed in with a rod such as a screwdriver, and in this case, the inclined surface 17 converts this pushing force in the direction of the center line c to facilitate separation of the frame-shaped link 1.

Effects of the invention This invention supports cables etc. in a hermetically sealed manner.
It prevents foreign objects from coming into direct contact with the cable, etc., and if the frame link is integrally molded from heat-resistant material such as aluminum alloy, it is effective in preventing damage to the cable etc. due to chips from machine tools. can be,
It has a good appearance because cables etc. are not visible from the outside.

[Brief explanation of drawings]

Figures 1 to 4 are respectively an elevation view, a partial plan view, and a partial left side view of a frame-shaped link according to an embodiment of the present invention.
5 is a partial sectional view taken along line A-A in FIG. 1, FIG. 6 is a sectional view taken along line BB in FIG. , b, and c are elevational views of different modified examples in which the front and rear gaps of the stay part are reduced, and Figures 9a, b, and c are sectional views of main parts showing different fitting structures between the outer link part and the tongue piece. be. 1... Frame link, 2, 3... Stay part, 4...
...Offset type link part, 5...Outer link part, 6
... tongue piece, 7 ... connection hole, 8 ... protruding pin part, 9
... Convex semi-cylindrical surface, 10 ... Concave cylindrical surface, 11 ...
...Recess, 12, 13...Side surface of recess, 14, 15
...the side of the tongue piece.

Claims (1)

[Scope of utility model registration request] A frame-shaped link surrounded by upper and lower stay parts and offset link parts on both sides is connected so as to be bendable to each other at a connection point of the link parts, and the outer link parts on both sides of the link part and the upper and lower stay parts The front part is a convex cylindrical surface centered on the connecting hole provided in the outer link part, and a recess that opens forward by surrounding the connecting hole is provided inside the outer link part, and both sides of the link part The inner link part forms a flexible tongue piece that slides into the recess, and has a protruding pin part on the outside that fits into the connecting hole,
The rear parts of both outer link parts and the upper and lower stay parts are made into a concave cylindrical surface with a slightly larger diameter than the convex cylindrical surface with the protruding pin part as the center, and a flexible tongue piece is inserted into the recess to connect the protruding pin part to the connecting hole. When inserted into the frame, the frame link can be bent between a straight position due to the contact between the sides of the recess and the tongue piece, and a predetermined angular position where the adjacent front and rear stay parts maintain overlap. A closed cable drag chain.