JPH0144839Y2 - - 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-casting are of an open type, and there is a risk that foreign matter may adhere to the housed cables, hoses, etc. from the outside and damage them. Generally, when an unmanned factory that uses a lot of automatic machine tools and automatic transportation equipment is monitored by a small number of workers, a high level of safety is naturally required of the equipment. If we look at the conventional cable drag chain from this point of view, even though it is a device that incorporates a power system and a control system, it is insufficient in terms of safety as described above.

Problems to be solved by the invention The purpose of this invention is to make the cable drag chain a closed type by connecting frame-shaped links integrally formed from plastic or die-casting, and to construct one side of the frame-shaped links so that they can be opened and closed. To propose a cable drag chain that facilitates the entry and exit of cables, etc.

Means to Solve the Problems This proposal has a frame shape in which one side of the outer link part of the opposing offset type link part is fixed to both sides of the support test part that becomes inside when bent, and the opening/closing stay part is attached to the other side. The links are bendably connected to each other at the offset type link part, and the front part of the outer link part, the support stay part, and the opening/closing stay part in the closed position has a convex centering on the connecting hole provided in the outer link part. The outer link has a cylindrical surface, and a recess that surrounds the connecting hole and opens forward is provided inside the outer link, and the inner link of the offset link has a flexible tongue that slides into the recess. It has a protruding pin part that slides into the connecting hole on the outside of the rear part, and the rear part of the outer link part, the supporting stay part, and the opening/closing stay part in the closed position is connected to the protruding pin part as the center from a convex cylindrical surface. It has a concave cylindrical surface with a slightly larger diameter, and when the protruding pin part is inserted into the connecting hole, the frame link forms a straight line due to the contact of the side surfaces of the recess and the flexible tongue piece. The front and rear opening/closing stay parts can be bent between a predetermined angular position that maintains the overlap, and the opening/closing stay part is hinged to one outer link part and is bent between the other outer link part in the closed position. It is characterized by having a concavo-convex engaging portion that engages with the concave-convex engaging portion and a snap that locks in the closed position.

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 contact between the side of the tongue and the side of the recess, resulting in so-called no-back bending characteristics. . Moreover, the front and rear opening/closing stay parts in the closed position at the predetermined angular position maintain overlap with each other by having cylindrical surfaces with a small gap, and the opening/closing stay part is closed against the outer link part by the hinge, the concave-convex engaging part, and the stop. Since it is held in place, foreign matter does not enter or adhere to the cables stored in the frame-shaped link from the outside, and even when the cable is bent, the opening/closing stay can be opened to allow cables, etc. to enter and exit, and for maintenance. .

Embodiment FIGS. 1 to 5 show the structure of an example of a frame-shaped link 1. FIG. The frame-shaped link 1 is integrally formed of plastic or aluminum die-casting, and includes a support stay part 2 for maintaining the cable K, etc., and opposing offset-shaped link parts 3a and 3b fixed on one side on both sides thereof.
The opening/closing stay part 4 is attached to this so as to be openable/closable. The offset link parts 3a, 3b have a thick outer link part 5 with high rigidity and a thin flexible tongue piece 6 which is an inner link part. Link parts 3a, 3
A connecting hole 7 and a protruding pin portion 8 that fit into the connecting hole 7 are provided in the outer link portion 5 and the outer surface of the tongue piece 6, respectively, with the connecting pitch of the frame-shaped link 1, at opposing positions on the center line c of b. A convex cylindrical surface 9 is formed around the connecting hole 7 at the front of the support stay part 2, the open/close stay part 4 in the closed position, and the outer link part 5, and the stay parts 2, 4 and the outer link part 5 A concave cylindrical surface 10 having a slightly larger diameter than the convex cylindrical surface 9 is formed at the rear part of the cylindrical surface 10 with the protruding pin part 8 as the center.

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 increasing in vertical width, and the angles α and β between the side surfaces 12 and 13 and the center line c are
Frame link 1 connected to (β>α) as described below
A difference is provided by a predetermined bending angle.

Link part 3 to which the opening/closing stay part 4 is hinged
A rectangular notch groove 14 parallel to the center line c is provided on the upper edge of the outer link part 5 of a, and a hinge shaft 15 also parallel to the groove is integrally formed with the outer link part 5. The cross-sectional shape of the hinge shaft 15 is an oval shape in which both sides of the upper and lower arcuate portions with a central angle of 90 degrees are surrounded by an outer surface 16 that is flush with the outer surface of the outer link portion 5 and an inner surface 17 that is parallel to this. The center is located approximately at the center of the depth of the notch groove 14. Further, a portion of the inner surface of the outer link portion 5 above the hinge shaft 15 before and after the notch groove 14 forms an arcuate surface 18 concentric with the hinge shaft 15 when viewed from the direction of the central axis c. 10, a cubic curve 19 and a cubic curve 20 are formed.

On the other hand, the hinge portion of the opening/closing stay portion 4 has a protrusion portion 22 on one side of the peripheral wall 21 that fits into the notch groove 14 in the closed position, as shown in FIGS. A hinge hole 24 is provided, into which the upper and lower arcuate portions of the shaft 15 fit, and which has a side opening 23 that is slightly larger in thickness than the outer surface 16 of the hinge shaft 15.

With the above hinge structure, after inserting the hinge shaft 15 into the hinge hole 24 from the opening 23 with the opening/closing stay part 4 in the open position parallel to the outer link part 5,
When the opening/closing stay part 4 is rotated in the closing direction or in the opposite direction, the hinge shaft 15 cannot be removed from the hinge hole 24, and the opening/closing stay part 4 is hingedly connected to the outer link part 5. The peripheral wall 21 is in close contact with the inner surface of the outer link portion 5 along the arcuate surface 18 at the front and rear portions of the protruding portion 22 . The protrusion 22 is formed with a circular arc surface 25 that is in close contact with the arc surface 18 .
The outer surface of 2 forms a semi-cylindrical surface 26 concentric with the hinge hole 24 so that it can rotate within the notch groove 14 when opening and closing.

Peripheral wall 21 on the opposite side of the hinge part of the opening/closing stay part 4
A snap 27 is integrally formed on the outer side of the approximately central portion. The upper end of the snap 27 is fixed to the peripheral wall 21 across the groove 28, and has a hook 29 inside the lower end. Further, a groove 30 extending in the direction of the central axis c is provided in the peripheral wall 21 inside the groove 28. When the opening/closing stay part 4 is closed,
The hook 29 slides inside the recess 31 formed on the outer side of the outer link part 5 of the link part 3b while being elastically deformed outward, and engages in the recess 32, and the hook 29 engages in the recess 32 and closes the opening/closing stay part 4.
hold in the closed position. In this state, the snap 27 fits into the recess 31 and becomes flush with the outer link portion 5.
By this fitting, the position of the opening/closing stay part 4 in the direction of the central axis c in the closed position is secured, and the groove 2
8 and 30 are convex walls 33 and 34 provided on the outer link portion 5
This meshes with the outer link portion 5 to prevent lateral deformation of the outer link portion 5, and increases the lateral pressure resistance of the frame-shaped link 1 having a two-part structure.

In the recess 11, an inclined surface 35 expanding outward is provided on the inner surface of the outer link portion 5, and the protruding pin portion 8 is pushed into the recess 11 along this slope and fitted into the connecting hole 7, thereby creating a frame shape. The links 1 are connected in a chain. In this case, the angle between the side surfaces 36 and 37 of the tongue piece 6 and the center line c is α, and the side surface 36 is the recess side surface 1.
When the side surface 37 abuts on the recessed side surface 13 (FIG. 8), the frame link 1 is bent at an angle of β-α. In order to determine both limits of the bending angle, a stopper of an appropriate shape may be used instead of the abutment between the side surfaces as described above. Pin portion 8 protruding into recess 11
In order to facilitate insertion, the outer surface of the protruding pin portion 8 is formed into an inclined curved surface 38, and a slope 39 is further provided on the outer side of the rear end of the tongue piece 6.

The thickness of the portion of the opening/closing stay portion 4 that becomes the convex cylindrical surface 9 is such that the convex cylindrical surface 9 becomes the concave cylindrical surface 1 when bent.
It is determined to maintain substantially sufficient overlap with respect to 0.

The frame-shaped links 1 are connected to the required length using the connecting holes 7 and the protruding pins 8 as described above, and the mounting brackets 4 are attached with similar connecting structures at the front and rear ends as shown in FIG.
0 and 41 are connected to form a cable drag chain, a partition plate 43 is attached to the protrusion 42 formed on the support stay part 2, the opening/closing stay part 4 is opened, and the cable K etc. is placed on the support stay part 2. When the opening/closing stay part 4 is closed, there is only a curved gap 44 between the adjacent frame links 1, which corresponds to a slight radius difference between the cylindrical surfaces 9 and 10, and from this gap, the frame shape Since there is no fear of foreign matter entering the link 1, the cable K can be held in a substantially hermetically sealed state. Further, even in the bent state, the opening/closing stay section 4 can be opened and closed to allow the cable K etc. to be inserted/extracted or inspected. During the bending, the rear end 4 of the concave cylindrical surface 10
A recess 46 is provided on the outer surface of the support stay part 2 in order to interfere with the support stay part 5.

10 to 16 show implementations in which the opening/closing mounting structure of the opening/closing stay part is different. A square notch groove 4 is formed on the upper edge of the outer link portion 5A of the offset link portion 3a.
7, and a hinge hole 48 in the direction of the center line c is provided in the outer link portion 5A so as to open at the front and rear edges thereof. The hinge hole 48 has an opening 49 whose central axis is located approximately at the center of the depth of the notch groove 47 and whose central angle is slightly larger than 90 degrees on the outer surface of the outer link portion 5A. Further, the inner surface of the outer link portion 5A before and after the notch groove 47 has a circular arc surface 18 concentric with the hinge hole 48 and cubic curves 19 and 20, as in FIG.

On the other hand, the hinge part of the opening/closing stay part 4A is
A hinge shaft 51 having a cross-sectional shape similar to that in FIG. 3 before and after the protrusion 50 that fits into the notch groove 47.
The side surface of the opening/closing stay part 4A before and after the protruding part 50 has an arcuate surface 52 centered on the hinge shaft 51 above the hinge shaft 51, and the side surface extends along the arcuate surface 18 to form an outer link. It comes into close contact with the inner surface of the portion 5A.

As in the case of the opening/closing stay section 4, the hinge shaft 51
is inserted into the hinge hole 48 from the opening 49 and the opening/closing stay part 4A is rotated, so that the opening/closing stay part 4A is hingedly connected to the outer link part 5A. The joint strength in this case is determined by the fact that the hinge part of the outer link part 5A is sandwiched between the hinge shaft 51 and the peripheral wall 21
Larger than the hinge structure shown.

A snap 53 is integrally formed inside the peripheral wall 21 on the side opposite to the hinge part of the opening/closing stay part 4A. Snap 5
3, the upper end is connected to the peripheral wall 21 from its outer surface to the outer link part 5
It is fixed at a position that is inward by the width of the groove 54 of A,
When the opening/closing stay part 4A is closed, the snap 53 is inserted into the recess 55 inside the outer link part 5A of the link part 3b.
The hook 56 slides while being elastically displaced inward and engages in the recess 57 to hold the opening/closing stay part 4A in the closed position. In this state, the groove 54 and the convex walls 58 formed inside the groove 55 before and after the recess 55 engage with the corresponding convex wall 59 and groove 60 on the opening/closing stay part 4A side, and form a frame like in the opening/closing stay part 4. Increases the lateral pressure resistance of the link. To remove the hook 56, insert a screwdriver etc. into the hole 61 and insert the hook 56 into the recess 5.
Just push it out from 7.

Effects of the invention This invention supports cables, etc. in a well-closed state, so it prevents foreign objects from directly touching the cables, etc. from the outside, and when the frame link is made of heat-resistant material such as aluminum alloy, machine tools In addition to protecting cables, etc. from chips, etc., the opening/closing stay section can be opened to allow cables, etc. to enter and exit, and for maintenance.Also, since cables, etc. are not visible from the outside, the appearance can be improved. There is.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the frame-shaped link 1 excluding the opening/closing stay part, FIG. 1 is a plan view, FIG. 2 is an elevation view, FIG. 3 is a right side view, and FIG. The figure is a partial left side view, FIG. 5 is a sectional view taken along the line A-A in FIG. 1, FIG. 6 is a plan view of an embodiment of the opening/closing stay part, FIG. FIG. 9 is a vertical cross-sectional view showing the connected state of the frame-shaped link, and FIG. 9 is an overall elevational view using the frame-shaped link in FIG. 1. FIGS. 10 to 13 are the frame-shaped links excluding the opening/closing stay part 10 is a plan view, FIG. 11 is an elevational view,
Figure 12 is a right side view, Figure 13 is B- in Figure 10.
14 is a plan view of another embodiment of the opening/closing stay part, FIG. 15 is an elevational view, and FIG. 16 is a right side view. 1...Frame-shaped link, 2...Support stay part, 3
a, 3b...Offset type link part, 4, 4A...
...Opening/closing stay part, 5,5A...Outer link part, 6...
... Flexible tongue piece, 7 ... Connection hole, 8 ... Protruding pin part, 9 ... Convex cylindrical surface, 10 ... Concave cylindrical surface, 1
1... recess, 12, 13... side of recess, 36,
37...Side surface of flexible tongue piece, 28, 30, 33,
34, 54, 58, 59, 60... uneven engagement portion,
27,53... Snap.

Claims (1)

[Scope of utility model registration request] One side of the outer link part of the opposing offset link part is fixed to both sides of the support stay part that becomes inside when bent, and the open/close stay part is attached to the other side, so that the frame link can be bent mutually in the offset link part. The front part of the outer link part, the support stay part, and the opening/closing stay part in the closed position forms a convex cylindrical surface centered on the connecting hole provided in the outer link part, and the inner side of the outer link part A recess that surrounds the connecting hole and opens to the front is provided, and the inner link part of the offset link part forms a flexible tongue that slides into the recess and fits into the connecting hole on the rear outside thereof. It has a protruding pin part, and the rear part of the outer link part, the support stay part, and the opening/closing stay part in the closed position is a concave cylindrical surface centered on the protruding pin part and having a slightly larger diameter than the convex cylindrical surface, and the connecting hole is formed into a concave cylindrical surface. When the protruding pin part is inserted, the frame-shaped link forms a straight line due to the contact of the side surfaces of the recess and the flexible tongue piece, and the predetermined angular position where the adjacent front and rear opening/closing stay parts maintain overlap. It can be bent between
The opening/closing stay part is hinged to one outer link part, and has a concave-convex engaging part that engages with the other outer link part in the closed position, and a snap that locks in the closed position. Dragon chain.