JP2001190014A - Jig for expanding grommet aperture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure smooth opening of an aperture of grommet by preventing slip of a jig body used to expand an aperture of grommet at the time of inserting a wire-harness and the grommet. SOLUTION: The contact expanding surface 33 of a plurality of jig bodies 24, 25, 26, 27 is tapered in such a manner that the external diameter is gradually reduced along the direction to the rear end side mounted to an operation rod from the front end side of each jig body or tapered with knurling process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet opening jig used to insert a wire harness into a grommet, and more particularly to a jig used to extend an opening of the grommet when inserting a wire harness. The present invention relates to a grommet opening expanding jig configured to prevent slipping between a tool body and a grommet and to smoothly perform a grommet opening operation.

[0002]

2. Description of the Related Art For example, the conventional structure of a jig for expanding a grommet opening used for inserting a vehicle wiring harness (wire bundle) into a grommet opening is as follows.
As shown in FIGS. 9 and 10, each of the jig bodies 1, 2, 3, and 4 is formed by dividing a cylindrical member into four equal parts in the circumferential direction.
The rear end face 4 is fixed via mounting screws 9 to respective operating rods 5, 6, 7, and 8 which move in the vertical and horizontal directions by a drive mechanism (not shown) such as a link or a cylinder. Is formed at the tip of a tapered taper 12 for facilitating insertion of each jig body into an opening 11 provided in the grommet 10.

A grommet extension 13 is formed between the front end and the rear end of each jig body 1, 2, 3, 4 as shown in FIG. The outer diameter (R) is formed such that its axial direction is the same.

The above four jig bodies 1, 2, 3, 4
9 and 12, the openings 11 of the grommets 10 are inserted into the jigs in a state where the operating rods 5, 6, 7, and 8 are vertically and horizontally moved. The jig bodies 1, 2, 3, and 4 are moved in the radial direction (see FIG. 13). Thereby, the diameter of the opening 11 of the grommet 10 is expanded against the elasticity of the grommet 10.

Thus, the wire harness 14 prepared in advance is inserted into the opening 11 of the grommet 10 having the opening 11 expanded, and thereafter, the jig bodies 1, 2, and
The grommet 10 expanded by 3 and 4 is shown in FIG.
As shown in the figure, the jig bodies 1, 2, 3, and 4 are slid in the tip direction, and the grommet 10 is moved to the jig bodies 1 and 2.
Remove from 2, 3 and 4 and position on wire harness 14.

[0006]

However, the grommet 10 for expanding the opening 11 using the jig bodies 1, 2, 3, and 4 is provided with a release agent ( Oil) and the lubricating action of an oil agent or the like mixed in the grommet in order to enhance the lubricity between the wire harness inserted into the grommet 10 and the grommet.
The stress of the grommet 10 at the time of working to expand the opening 11 of the grommet 10 by 2, 3 and 4 causes the grommet 10 to move as shown in FIGS.
There is a drawback that the grommet 10 comes off from the jig bodies 1, 2, 3, and 4 before the wire harness 14 is inserted into the grommet 10 due to the sliding of the grommet 10 in the tip direction. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional inconveniences. In a jig for expanding a grommet opening by displacing a plurality of jig main bodies in a radial direction, the jig main bodies are provided. It is an object of the present invention to prevent the grommet from dropping off from the jig body when the grommet opening is expanded by the above method, and to enhance the workability of expanding the grommet opening and the workability of inserting the wire harness into the grommet opening.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, the rear ends of a plurality of jig bodies formed by equally dividing a cylindrical body in a circumferential direction are vertically and horizontally shifted. The jig body is provided so as to be displaceable in the radial direction with respect to the axis thereof by the operation of these operating rods, and the circumferential curved surface of each jig body is fixed. ,
In the grommet opening expansion jig, which is a contact expansion surface that comes into contact with the inner peripheral surface of the opening of the grommet, the contact expansion surface of each jig main body extends along the direction toward the operating rod mounting end from the tip end side of each jig main body. It is a grommet opening expansion jig formed in a taper whose outer diameter gradually decreases.

According to a second aspect of the present invention, in addition to the first aspect, the present invention is characterized in that the opening expansion jig is a grommet provided with a knurl on the tapered contact expansion surface to prevent slippage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

1 and 2, reference numeral 21 denotes a grommet having an opening 22 and made of a flexible elastic material such as rubber. Reference numeral 23 denotes a wire harness (not shown) in the opening 22 of the grommet 21. This is a jig used to expand the inner diameter of the opening 22 of the grommet 21 at the stage of preparing for the insertion operation.

As shown in FIG. 2, the jig 23 has a pin-shaped shaft having a front end formed on a tapered tapered surface 23A and a rear end formed on a mounting surface 23B orthogonal to the axis. It has four jig bodies 24, 25, 26 and 27 divided into four equal parts in the circumferential direction, and a mounting mechanism 23B of each of these jig bodies is provided with a drive mechanism such as a link or a cylinder (not shown). Thus, the operating rods 28, 29 and 30, 31 which reciprocate vertically and horizontally are fixed via mounting screws 32.

Each of the jig bodies 24, 25, 26, 2
7 between the tapered tapered surface 23A and the mounting surface 23B.
The divided peripheral curved surface is formed on a contact expansion surface 33 that can come into contact with the inner peripheral surface of the opening 22 of the grommet 21. The contact expansion surface 33 is formed by the jig bodies 24, 25, 26, and 27.
The taper is formed such that the outer diameter gradually decreases along the mounting surface 23B side from the tapered tapered surface 23A side.

In the grommet opening expanding jig configured as described above, four jig main bodies 2 are provided.
The respective operating rods 28, 29 in which the rear end mounting surfaces 23B of the 4, 25, 26, 27 independently move vertically and horizontally.
, And 30 and 31, and the operating rods 2
8 and 29 are reciprocated simultaneously in the vertical direction and the operating rods 30 and 31 in the left and right direction.
Jig bodies 24, 2 fixedly held at 9, 30, 31
As shown in FIG. 1, 5, 26 and 27 are gathered in the direction of the axis (Y) to form a single shaft, and as shown in FIG. Is what is done.

Therefore, as a preparation step for inserting a wire harness (not shown) into the grommet 21 having the opening 22 by using the jig 23, the opening 2 of the grommet 21 is prepared.
An operation to expand the inner diameter of the second is required. This opening 2
Prior to the inner diameter expansion work of 2, as shown in FIG.
The four jig bodies 24, 25, 26, 27 are
The assembly is assembled in the axial center (Y) direction by the driving force of 8, 29, 30, 31 and the opening 22 of the grommet 21 is inserted and held in the jig bodies 24, 25, 26, 27 in this state (see FIG. 3). .

Next, the jig bodies 24, 25, 26, 27 are moved radially with respect to the axis (Y) by the driving force of the operating rods 28, 29, 30, 31, so that the jig bodies are moved. The opening 22 of the grommet 21 held by the jig bodies 24, 25, 26, 27 is expanded as shown in FIG. 5 against its flexible elasticity.

When the grommet opening 22 is expanded, the contact expanding surface 33 with which the inner peripheral surface of the opening 22 comes into contact is formed at the tip end (taper taper) of each of the jig bodies 24, 25, 26, 27. From the surface 23A side) to the rear end portion (the mounting surface 23B side), the outer diameter becomes gradually smaller, so that each jig main body 24 is formed on the inner peripheral surface of the grommet opening 22. Even if the expansion stress is generated due to 25, 26, 27, the grommet 21 is attached to each jig body 24,
Each of the jig bodies 24, 25, 2 is displaced (moved) in the direction of the mounting surface 23B along the tapered surface of each of the jig bodies 24, 25, 2.
Since there is no shift in the tip direction of 6, 27,
When the opening 22 of the grommet 21 is expanded, the grommet 21 does not fall off the jig 23, and the work of inserting the wire harness into the grommet opening 22 can be performed smoothly.

FIGS. 6 to 8 show another embodiment of the present invention. In this embodiment, each of the jig bodies 24, 25, 26, and 27 described in the above embodiment is described. Knurls 34 to be non-slip on each contact expansion surface 33
It has been subjected to. Thus, each jig body 24, 2
Each of the jig bodies 2 is provided with a knurl 34 serving as a non-slip on the contact expansion surfaces 33 of the 5, 26, 27.
When an expanding force acts on the opening 22 of the grommet 21 in accordance with the movement of the jig main body 2, 4, 25, 26, 27,
The grommet is less likely to slide with respect to the grommet opening portions 22, 25, 26, 27.
The inner diameter of the grommet can be expanded while the grommet is positioned stably.

In each of the above embodiments, each jig body 25 is formed by dividing a cylindrical body into four equal parts in the circumferential direction. However, the present invention is not limited to this. The body may be divided into three equal parts in the circumferential direction, or three or more.

[0020]

As described above, according to the grommet opening expanding jig of the present invention, when the grommet opening is expanded by a plurality of jig bodies, the grommet is separated from each jig body. The problem of falling off can be prevented beforehand, and the work of inserting the wire harness into the grommet can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a grommet opening expanding jig according to the present invention.

FIG. 2 shows a configuration of a grommet opening expanding jig according to the present invention, wherein (a) is an exploded perspective view thereof, and (b) is a side view of only the jig main body.

FIG. 3 is a perspective view showing a state where a grommet is inserted into a grommet opening expanding jig according to the present invention.

FIG. 4 is an operation explanatory perspective view of the grommet opening expanding jig according to the present invention.

FIG. 5 is a cross-sectional view showing a grommet being expanded by a grommet opening expanding jig according to the present invention.

FIG. 6 is a side view showing a jig body according to another embodiment used for the grommet opening expanding jig according to the present invention.

FIG. 7 is a perspective view showing another embodiment of the grommet opening expanding jig according to the present invention.

FIG. 8 is a side view showing a grommet opening expansion jig according to another embodiment of the present invention when the grommet is expanded.

FIG. 9 is a perspective view showing a conventional grommet opening expanding jig.

FIG. 10 is an operation explanatory view of a conventional grommet opening expanding jig.

FIG. 11 is a side view showing a conventional jig main body.

FIG. 12 is a sectional view showing a state where a grommet is inserted into a conventional jig body.

FIG. 13 is a cross-sectional view showing a state where a grommet is expanded by a conventional jig body.

FIG. 14 is a cross-sectional view showing sliding of the grommet when the grommet is expanded by the conventional jig body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Grommet 22 ... Opening 23 ... Jig 24 ... Jig body 25 ... Jig body 26 ... Jig body 27 ... Jig body 28 ... Vertical operating rod 29 ... Vertical operating rod 30 ... Left / right operating rod 31 … Left and right direction operating rod 32… mounting screw 33… contact expansion surface 34… knurl

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Makoto Sasaki 3-137 Nisshincho, Omiya-shi, Saitama F-term in Kyoritsu High Parts Co., Ltd. 5G363 AA16 BA02 CB08

Claims (2)

[Claims] 1. Each of the rear ends of a plurality of jig bodies (24), (25), (26), and (27) obtained by equally dividing a cylindrical body in a circumferential direction can reciprocate vertically and horizontally. The jig body is fixed to operating rods, and the jig body is provided so as to be displaceable in the radial direction with respect to its axis (Y) by the operation of these operating rods, and the jig body (24) (25) (26) ) (27)
Of the jig main body (24) (25) (26) (2) in the grommet opening expansion jig in which the circumferential surface of the grommet is a contact expansion surface (33) that comes into contact with the inner circumferential surface of the grommet opening.
7) The grommet opening expansion, characterized in that the contact expansion surface (33) is formed in a taper whose outer diameter gradually decreases along the rear end side attached to the operating rod from the front end side of each jig body. jig. 2. A jig for expanding a grommet opening according to claim 1, wherein a knurl (34) serving as a non-slip is provided on the tapered contact expanding surface (33).