JPH10227306A - Earthing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix and connect a bracket requiring ground to an earth side member in a single operation. SOLUTION: A pair of first engaging parts 14A, 14B is arranged on a projected part 14 arranged in a bracket 1, and also a second engaging part 1A is arranged in the bracket 1, and further cam parts 2A, 2B with which the first engaging parts 14A, 14B are engaged when the projection 14 is inserted in a passing hole 15 in a body 2 being an earth side member and the bracket 1 is rotated, are arranged in the body 2. Under a condition that the body 2 is sandwiched, the first engaging parts 14A, 14B and the second engaging part 1A are brought into pressure contact with a surface on a body 2 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding device for fixing a member to be grounded to a grounding member and electrically connecting both members to ground.

[0002]

2. Description of the Related Art In various machines and devices such as automobiles, electronic devices, and electric appliances, it is widely practiced to ground a member to be grounded by fixing the member to be grounded to a grounding side member.

FIGS. 9 and 10 show a conventional example of such a device.
1 shows a grounding device for a motor vehicle. 9 is an antenna fixedly supported on the body of the automobile, and this antenna 8 is a radio (not shown) mounted inside the vehicle via the shielded wire 5 as shown in FIG. )
Is electrically connected to An antenna amplifier 4 is provided in the middle of the shielded wire 5, and this amplifier 4 is housed in the housing 3 made of a conductor. As shown schematically in FIG. 9, the shield wire 5 is formed by winding a mesh wire 7 made of a conductor through a not-shown insulating layer around a central conductive wire 6,
This is covered with an insulating outer layer (not shown), and an antenna amplifier 4 is provided in the middle of the conducting wire 6. The housing 3 is electrically connected to the mesh wire 7. FIG.
Reference numeral 9 denotes a connector for connecting the shield wire 5 to the antenna 8.

Here, the housing 3 of the above-described antenna amplifier 4
Is electrically connected to a body 2 made of a conductor such as a steel plate to ground the housing 3. Therefore, here, the housing 3 made of a conductor serves as a member to be grounded, and the body 2 also made of a conductor serves as a grounding-side member. Conventionally, grounding has been performed as follows.

[0005] As shown in Fig. 10, the housing 3 has a tongue-shaped bracket 1, which is also made of a conductor. A bolt 12 is inserted into a hole 1 a formed in the bracket 1, and the bolt 12 is screwed and fastened to a weld nut 13 previously fixed to the body 2, thereby fixing the housing 3 to the body 2. The surface of the body 2 to which the bracket 1 is joined has its coating film removed in advance, so that both are electrically connected. If an earth bolt capable of peeling off the coating film is used as the bolt 12, the above-described work of peeling the coating film is unnecessary.

It is also practiced to ground the intermediate portion of the shielded wire 5. In this case, the base of the grounded member made of the conductor plate 11 is placed on the portion of the shielded wire 5 where the mesh wire 7 is exposed. Then, the plate 11 and the mesh wire 7 are electrically connected. Then, a hole 11a formed in the plate material 11
The bolt 112 is screwed into a weld nut 113 previously fixed to the body 2, and the plate material 11 is
Is fixed to the body 2 and both are electrically connected.

As described above, the conventional grounding device is:
A grounded member to be grounded, such as the housing 3 or the plate 11, is connected to a ground-side member made of the body 2 by a bolt 1.
2, 112 and nuts 13, 113, and the grounded member is grounded by electrically connecting the grounded member and the ground side member. However, such a grounding device requires nuts and bolts fixed to the body in advance, which increases the number of parts and increases costs. Moreover, troublesome bolt tightening work is required, and the workability is reduced.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a grounding device which can connect and fix a grounded member to a grounding side member with one touch without using fastening elements such as bolts and nuts. is there.

[0009]

According to the present invention, in order to achieve the above object, in a grounding device of the type described at the outset, a projection is provided on a member to be grounded, and the projection is inserted into a member on the ground side. By forming a through hole through which the grounded member is inserted into the through hole from one side of the ground side member, the ground member moves from one side to the other side through the through hole. A first engaging portion projecting from the projecting portion;
After the projection is inserted into the through hole, the second engagement portion located on one side of the ground-side member protrudes from the grounded member, and after the projection is inserted into the through hole, the grounded member is inserted. Is rotated relative to the ground-side member around the central axis of the protrusion, the first engagement portion presses against the other surface of the ground-side member, and the second engagement portion contacts the ground. A cam means for guiding at least one of the first and second engaging portions in the direction of the central axis of the projection so as to press against one surface of the side member is provided on the earth side member. We propose a grounding device.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show the case where the present invention is applied to an automobile grounding device in which the housing 3 of the antenna amplifier 4 shown in FIGS. 9 and 10 is fixed to the body 2 and the housing 3 is grounded. 1 shows an embodiment example. Therefore, also in this example, the housing 3 having the bracket 1 made of a conductor constitutes a grounded member to be grounded, and the body 2 also made of a conductor
Constitute a ground side member.

As shown in FIGS. 1 and 2, a cylindrical projection 14 is provided on the bracket 1 of the housing 3, and the projection 14 is inserted into the body 2 which is an example of a ground-side member. A circular through hole 15 is provided. The protrusion 14 is also made of a conductor such as a metal. The protrusion 14 has a first engaging portion 14
A and 14B protrude, respectively. In the present embodiment, the pair of first engagement portions 14A and 14B are cylindrical projections 14.
The first engaging portions 14A and 14B are also formed of conductors. When the protrusion 14 is fitted into the through hole 15 of the body 2, the first engagement portion 1
It has notches 15a and 15b that allow passage of 4A and 14B. As described above, in the grounding device of the present example, the projection 14 is provided on the bracket 1 of the housing 3 forming the member to be grounded, and the body 2 forming the grounding side member is
A through hole 15 into which the protrusion 14 is inserted is formed.

FIG. 2 is a view of the bracket 1 shown in FIG. 1 and the body 2 having the through hole 15 as viewed from the body side. In this figure, the surface of the bracket 1 near the protrusion 14 is shown. Are provided with a pair of second engagement portions 1A and 1B, respectively. In this example, these second engagement portions 1A, 1
B is also formed by cutting and raising the bracket 1, and these second engagement portions 1 </ b> A, 1 </ b> B stand up in the direction of the protrusion 4.

In the illustrated example, two first engagement portions and two second engagement portions are provided, but the number may be at least one. Further, the second engagement portion may be provided so as to project from the outer peripheral surface of the projection of the bracket 1.

FIG. 3 shows the positional relationship between the protrusion 14, the first engaging portions 14A and 14B, the second engaging portions 1A and 1B, and a cam portion described later in FIG. It is the figure which showed typically from the state seen from. As can be seen from this figure, the second engaging portion 1A is provided at an angular position separated from the first engaging portion 14A by an angle θ (θ> 0) in the circumferential direction of the projection 14. In this example, this angle θ is approximately 45 degrees. Another second engagement portion 1B is also provided at the same relational position with respect to the first engagement portion 14B.

As shown in FIGS. 1 and 2, the body 2 is provided with through holes 1 from the positions of the notches 15a and 15b.
5, cam portions 2A and 2B formed by molding the body itself are provided at approximately 90 degrees along the circumferential direction. As shown in FIG. 2, the one cam portion 2A gradually increases in height from the side of the notch portion 15a toward the notch portion 15b along the circumferential direction of the through hole 15 toward the notch portion 15b. It has such an inclined shape. The other cam portion 2B has an inclined shape such that the height gradually increases from the side of the notch portion 15b toward the notch portion 15a along the circumferential direction of the through hole 15 in a direction away from the bracket 1. It has become something. FIG. 5 is a side view of the cam portions 2A and 2B shown in FIG. 1 as viewed from the direction of arrow c in FIG.

In FIG. 1, first, a projection 14 formed on the bracket 1 of the housing 3 is connected to each of the first engagement portions 14A, 14A.
B is inserted into the through hole 15 from one side of the body 2 so that B passes through each of the notches 15a and 15b. FIG. 3 shows a state where the insertion of the protrusion 14 is completed, and the first engagement portions 14A and 14B shown in FIG.
Through to the other side of the body 2. in this way,
From one side of the earth side member composed of the body 2, the housing 3
By inserting the projection 14 of the grounded member into the through hole 15 formed in the ground side member, the first engagement portions 14A and 14B protruding from the projection 14 are passed through the through hole 15 to the ground side. The transition is from one side of the member to the other. At this time, the second engagement portions 1A and 1B protruding from the grounded member made of the housing 3 remain on one side of the ground side member even after the protrusion 14 is inserted into the through hole 15. is there.

After the projection 14 is inserted into the through hole 15, when the bracket 1 starts to rotate in the direction of arrow a around the central axis 16 (FIG. 1) of the projection 14, one of the first engagement portions 14
A approaches the cam portion 2A and rides on the inclined surface A (FIG. 5). Further, the other first engagement portion 14B is also the cam portion 2B.
And rides on the inclined surface B (FIG. 5). FIG.
3 shows the movement of each engaging portion as viewed from the direction of arrow d in FIG. 3. One first engaging portion 14A slides on the inclined surface A of the cam portion 2A while being guided by the inclined surface A. , Cam part 2A
It engages the highest flat portion 2A ₁ of as shown in phantom. The other first engagement portion 14B also slides on the inclined surface B of the cam portion 2B shown in FIG. 2 while being guided by the inclined surface B, and is brought into contact with the highest flat portion 2B ₁ (FIG. 5) of the cam portion 2B. Ride up and engage this area. The engagement is completed when the bracket 1 is rotated by approximately 90 degrees from the initial position, that is, the position shown in FIG. FIG. 4 shows the engaged state.

While the bracket 1, that is, the housing 3 is rotated 90 degrees from the initial position as described above, the first engaging portion 14A shown in FIG. although the rides on parts 2A _1, in the meantime, the bracket 1 are attracted to the body 2 side, with the first engagement portion 14A rides on the flat portion 2A _1, the first engagement portion 14A and the second engaging The portion 1A is pressed against the surface on one side and the surface on the other side of the body 2 respectively. The other first
The same applies to the engaging portion 14B and the second engaging portion 1B.
Distance D between the second engaging portion 1A and the first engagement portion 14A is Yes somewhat smaller set than the height of the flat portion 2A ₁ of the cam portion 2A, thereby, the engaging portion 1A, 14A is The body 2 is pressed against each side surface. Similarly, the other engaging portions 1B and 14B are pressed against the respective surfaces of the body 2 respectively. When the housing 3 is rotated about the center axis 16 of the protrusion 14 with respect to the body 2, the first engagement portions 14 A, 14 B are provided on the other surface of the body 2 when the housing 3 is rotated with respect to the body 2. So that the second engagement portions 1A and 1B are in pressure contact with the surface on one side of the body 2.
A and 14B are guided in the direction of the central axis 16 of the projection 14.

In the illustrated example, the bracket 1 is rotated 90 degrees in the direction of arrow a from the position shown in FIG.
The two first engagement portions 14A, 14B are respectively associated with the corresponding cam portions 2A,
2B, the second engagement portions 1A, 1B are pressed against the flat surface of the body 2. In this pressed state, the first engagement portions 14
A, 14B and the two second engaging portions 1A, 1B press the body 2 from each side thereof. Thereby, the housing 3 having the bracket 1 is fixed to the body 2.

The outer surface of the body 2 is covered with an insulating coating film. As shown in FIG.
4A and the second engagement portion 1A are connected to the other first and second engagement portions 1A.
When slidingly pressed against the surface of each side of the body 2 together with 4B and 1B, the coating film is peeled off at the engaging portions.
For this reason, each engaging portion comes into direct contact with the surface on each side of the body 2, and both are electrically connected to each other. As described above, the grounding device fixes the housing 3, which is the grounded member to be grounded, to the grounding side member formed of the body 2, and electrically connects the two to ground the grounded member.

In the illustrated example, as the housing 3 rotates,
Although the first engagement portions 14A and 14B are configured to be guided by the cam portions 2A and 2B in the direction of the central axis 16 of the protrusion 14, the cam portions with which the second engagement portions 1A and 1B come into contact with the body 2. The cam portion guides the second engaging portions 1A and 1B in the direction of the center axis 16 of the projection 14 with the rotation of the housing 3, and the second engaging portions 1A and 1B Joint 1
A and 1B may be configured so as to be pressed against the respective surfaces of the body 2. In this case, the cam portion is as shown in FIG.
And it protrudes in the opposite direction to the cam portions 2A and 2B shown in FIG. Alternatively, a cam portion with which all the engaging portions are in sliding contact may be formed on the body 2 such that the first and second engaging portions are both guided in the central axis direction of the protrusion 14. Also,
In the illustrated example, the ground-side member is made of a body,
Although the housing 3 which is an example of the grounded member is rotated, depending on the case, the ground side member may be rotated, or the ground side member and the grounded member may be rotated together.
What is necessary is just to rotate both relatively.

As can be seen from the above description, in this embodiment, after the cam portions 2A and 2B insert the protrusions into the through holes,
When the member to be grounded is relatively rotated with respect to the ground-side member around the central axis of the protrusion, the first engagement portion comes into pressure contact with the other surface of the ground-side member, and A cam means for guiding at least one of the first and second engaging portions in the central axis direction of the protrusion so that the engaging portion is pressed against one surface of the ground-side member. The grounding device has such cam means. In this way, the grounding device fixes the member to be grounded to the grounding-side member, and electrically connects both members to ground the member to be grounded.

As described above with reference to FIG. 10, the intermediate portion of the shield wire 5 may be grounded. In this case, as shown in FIG. Then, the base end of the plate 11 made of a conductor is fixed, and the net wire made of the conductor and the plate 11 are electrically connected. Then, the plate member 11 and the body 2 are configured in exactly the same manner as described above with reference to FIGS.
This can be used as a grounding device. 7 corresponding to FIGS. 1 to 6 are denoted by the same reference numerals as in FIGS. FIG. 8 shows a state in which the plate 11 is rotated in the same manner as the bracket is rotated in the previous example. In the example shown in FIG.
Construct a grounded member to be grounded.

According to the embodiment described above, the housing 3 in which the antenna amplifier 4 is provided without using fastening elements such as bolts and welding nuts fixed to the body.
Alternatively, a member to be grounded, such as a grounding plate 11 at the intermediate portion of the shielded wire 5, can be fixed to the body 2 side with one touch, and can be grounded at the same time. The grounded member that needs to be grounded can be fixed to the body side by a simple operation without using a tool, and the grounded member can be grounded. Further, since no bolts or welding nuts are required, the cost and weight of the vehicle can be reduced.

Conventionally, a special bolt capable of peeling off the coating film was used in some cases. However, in the present embodiment, such an expensive special bolt is unnecessary, so that the cost of the automobile is further increased. Can be reduced.

The grounding device for grounding a member to be grounded related to the antenna of a vehicle has been described above. However, the present invention relates to a relay or other electric parts attached to a vehicle,
Alternatively, the present invention can be applied to a grounding device for elements of various machines and devices other than automobiles.

[0028]

According to the grounding device of the present invention,
The grounded member that needs to be grounded can be connected and fixed to the ground-side member with one touch without using a fastening element such as a bolt or a nut.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a grounding device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the grounding device shown in FIG. 1 as viewed from a body side.

FIG. 3 is an explanatory view showing a relative position of each engagement portion and each cam portion when a protrusion of a bracket is inserted into a through hole of a body.

FIG. 4 is an explanatory view showing the relative positions of each engagement and each cam when the bracket is rotated 90 degrees after the projection of the bracket is inserted into the through hole of the body.

FIG. 5 is a side view showing a cam portion provided on a body.

FIG. 6 is a cross-sectional view showing a state in which an engaging portion of a bracket is engaged with a cam portion and a body flat portion of a body.

FIG. 7 is an exploded perspective view showing a main part of a grounding device for a plate material attached to an intermediate portion of the shield wire.

FIG. 8 is a perspective view for explaining that the plate member is grounded to the body by rotation of the plate member.

FIG. 9 is a view used to explain a conventional grounding device, and is an explanatory view showing a housing in which an antenna amplifier is provided.

FIG. 10 is a perspective view showing a conventional grounding device.

[Explanation of symbols]

 1A Second engaging portion 1B Second engaging portion 14 Projecting portion 14A First engaging portion 14B First engaging portion 15 Through hole 16 Center axis

Claims (1)

[Claims] An earthing device for fixing a grounded member to be grounded to a ground-side member and electrically connecting the grounding member to the grounded member, wherein a protruding portion is provided on the grounded member, By forming a through hole into which the protrusion is inserted in the member, and inserting the protrusion of the grounded member into the through hole from one side of the ground side member, one of the ground side members is inserted through the through hole. A first engaging portion that shifts from one side to the other side is protruded from the protrusion, and after the protrusion is inserted into the through hole, the second engaging portion located on one side of the ground-side member is also provided. When the member to be grounded is rotated relative to the ground-side member around the central axis of the protrusion after the protrusion is inserted into the through-hole and the protrusion is inserted into the through-hole, the first engagement portion Is pressed against the other surface of the ground member, and the second engagement portion is Of so as to press the surface side, ground-up device, characterized in that a cam means for guiding the central axis direction of the projection of at least one of the first and second engaging portions to the ground member.