JPH055651Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a ground wire fixture that has a simple structure and allows the ground wire to be easily and firmly fixed to various ground surfaces.

(Prior Art) For example, in an arc welding machine, in order to generate an arc between the base material and the welding rod, the end of a ground wire drawn out from the welding machine is fixed to a ground piece.
The base material is connected to the power source via this ground piece. In this case, if the grounding surface is sloped or curved, there is a risk that the grounding piece will fall off and welding becomes impossible. It is fixed using a screwdriver to prevent it from interfering with work.

(Problem that the invention aims to solve) However, in order to fix the ground wire with this method, a special fixing device such as the above-mentioned vise is required, and when fixing it, it is necessary to tighten the vise. As a result, the attachment/detachment operation is troublesome and requires time and effort. Especially when using a vise like the one above, if the contact point is thick or the contact surface is a curved surface,
There was a problem in that the grounding piece could not be fixed properly or could not be used in various situations on the ground surface.

The present invention solves these conventional problems and has a simple configuration that allows normal use even if the ground surface is uneven or made of non-magnetic material, and also allows for preparations such as removing rust from the ground surface. It is an object of the present invention to provide a ground wire fixture that can reduce work effort and suppress heat generation due to contact resistance.

(Means for solving the problem) Therefore, the ground wire fixing device of the present invention is a ground wire fixing device that includes a magnet, a clamper that can fix the ground wire, and a plurality of claw pieces for scraping. , providing a bracket made of a conductive member that holds the magnet by releasing the lower end surface of the magnet;
A plurality of claw pieces spaced apart from each other are provided at the lower end of the bracket to protrude below the lower end surface of the magnet, and the tips of these claw pieces are placed in contact with the ground surface, and the lower end surface of the magnet is spaced apart from the ground surface. By doing so, the simple structure allows normal use even if the grounding surface is somewhat uneven or is made of non-magnetic material, and it is possible to reduce the time and effort required for preparation work such as removing rust from the grounding surface. , is characterized by being able to suppress heat generation due to contact resistance.

(Embodiment) Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. In Figs. 1 and 2, 1 is a bracket formed by molding a conductive plate into a substantially box shape, and the lower ends of the opposing side pieces 2, 2 are A locking line 3, 3 whose lower edge is bent inward is formed on the portion, and claw pieces 4, 4 are provided at both ends of the locking edge 3, 3. Bracket 1
A relatively heavy magnet 5 having a rectangular cross section is housed inside the magnet 5, and its lower end surface is held by the locking edges 3, 3. In addition, 6 in the figure is a cylindrical clamper protruding from a suitable position on the outer circumferential surface of the bracket 1, which allows the end of the ground wire 7 drawn out from the electrical equipment to be accommodated inside, and is attached to the outer circumferential surface of the bracket 1. It is clamped and fixed by attached screws 8, and 9 is a ground plane made of a conductive member, which in the case of the embodiment is made of a magnetic material such as a steel plate.

3 and 4 show another embodiment of the present invention, in which the same reference numerals are used for corresponding components as in the previous embodiment. Among these, in the second embodiment of the present invention shown in FIG.
While attempting to ground under various structures, the clamper 6 is removably installed at the center of each peripheral surface via a screw mechanism, and the grounding can be performed depending on the pull-out position of the ground wire 7 and the condition of the ground surface 9. The feature is that the format can be adopted as appropriate.

Further, in a third embodiment shown in FIG. 4, one end of a screw shaft 12 made of an insulating member is fixed to a pivot shaft 11 of a so-called alligator grip 10, and a bracket 1
Screw holes (not shown) are provided on the entire circumferential surface of the bracket 1, and the alligator grip 10 is removably attached to each circumferential surface of the bracket 1 through these screw holes and the screw shaft 12. In the case of a conductive member made of a non-magnetic material, the alligator grip 10 is engaged with a nearby immovable member 13 to fix the fixture.

(Function) The ground wire fixing device configured as described above can be easily manufactured by press-molding a steel plate, for example, and when holding the magnet 5, it is held via the locking edges 3, 3. Because of the holding structure, for example, the magnet 5 can be easily fixed by inserting the magnet 5 from the side of the bracket 1 and storing it on the locking edges 3, 3, and then bending the opposing side pieces of the bracket 1. It happens.

Next, when performing grounding using such a ground wire fixture, hold the bracket 1 and place the tip of the claw piece 4 at the appropriate place on the ground plane 9 made of a suitable conductive material located around the electrical equipment. After housing the ground wire 7, it is sufficient to insert the end of the ground wire 7 into the clamper 6 and press and fix it with the screws 8.If the ground wire 7 is to be used exclusively for a specific device, the installation work of the ground wire 7 can be carried out in the following manner. It only needs to be done the first time, and is not required for subsequent uses. At this time, if the grounding surface 9 is rusted or painted, which prevents good grounding, scratch the grounding surface 9 with the claw piece 4 to remove the rust or paint and maintain a certain grounding surface 9. is exposed and a claw piece 4 is installed on it to prepare a grounding environment. Therefore, a wire brush, which is often used for this type of purpose, becomes unnecessary.

In this case, since the present invention grounds the claw 4 in point contact with the ground surface, it is sufficient to scrape a portion of the ground surface 9, which reduces the effort required for preparatory work such as removing rust, compared to when the entire surface of a conductive material such as a mat is brought into contact with the ground surface 9.

The weight of the ground wire fixture thus installed on the ground plane 9 is supported by the tips of the four claw pieces 4.
Since the contact surface pressure between them becomes significantly large, the fixation to the ground surface 9 is improved,
Since the so-called bite is strong, even if the ground plane 9 is somewhat inclined or has a convex or concave curved surface, it is possible to maintain a fixed position without falling or sliding down. In this case, if the leg length of the claw piece 4 is made as short as possible, the center of gravity of the fixing device will be moved downward, thereby improving stability.

Furthermore, if the ground plane 9 is a conductive member made of a magnetic material such as a steel plate, the magnetic force of the magnet 5 is added to the claw piece 4, further increasing the contact surface pressure. Sexuality will be further enhanced. Moreover, in this case, magnet 5
Since the lower surface forming the magnetic pole is wide, the resultant force of the attraction force is extremely large and
This acts to strengthen the fixing properties of the fixing device. Moreover, since the magnet 5 is installed apart above the ground plane 9 via the claw pieces 4, some unevenness of the ground plane 9 between the claw pieces 4 is allowed, and various ground planes 9 can be It will be possible to correspond to
Therefore, on the ground surface 9 with uneven parts, the magnet 5
Compared to the structure that directly adsorbs and fixes the
Its stability will be improved.

After installing the ground wire fixture on the ground plane 9 in this way, when the electrical equipment is operated, the current leaking from the electrical equipment is guided to the ground wire 7, passes through the clamper 6 and the bracket 1, and then passes through the claw piece 4. From ground plane 9
flows to

In this case, since the tip of the claw piece 4 is in point contact with the ground plane 9, there is a risk that the contact resistance at that part will increase and heat generation will be promoted.

However, since the lower end surface of the magnet 5 and the ground plane 9 are spaced apart from each other to form a gap, the above-mentioned heat generation is suppressed by the cooling effect of the gap.

After using an electrical device, if it is used exclusively for a specific device, it is sufficient to hold the bracket 1 and store it in place without removing the ground wire 7, and there is no need to attach or detach it using a vise like in the past. , this type of work can be done easily.

(Effect of the invention) As described above, the ground wire fixing device of the present invention is provided with a bracket made of a conductive member that holds the magnet by releasing the lower end surface of the magnet, and has a plurality of wires spaced apart from each other at the lower end of the bracket. The structure is simple because the claw pieces are provided to protrude below the lower end surface of the magnet, the tips of these claw pieces are in contact with the ground surface, and the magnet is installed with the lower end surface separated from the ground surface. Even if the ground surface is slightly uneven or made of a non-magnetic material, the weight of the magnet acting on the tip of the claw will firmly bite the claw onto the ground surface, preventing its movement. It is possible to prevent the product from falling over and allowing normal use.

Moreover, if the ground plane is a conductive member having magnetism, the magnetic force of the magnet acts in addition to the weight of the magnet, so that it can be installed even more firmly.

Further, in the present invention, since the claw piece is in point contact with the ground surface, compared to a case where the claw piece is in surface contact, it is possible to reduce the time and effort required for preparation work such as removing rust from the ground surface.

Furthermore, since the present invention separates the lower end surface of the magnet from the ground surface and connects it to the ground, heat generation due to contact resistance between the claw piece and the ground surface can be suppressed compared to a case where the lower end surface of the magnet and the ground surface are in contact. can.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a longitudinal sectional view taken along the line A-A' in Figure 1, Figure 3 is a front view showing the second embodiment of the present invention, and Figure 4 is a front view showing main parts of the third embodiment of the present invention. It is a diagram. 1... Bracket, 4... Claw piece, 5... Magnet, 6... Clamper, 7... Earth wire, 9...
contact area.

Claims (1)

[Scope of utility model registration request] In a grounding wire fixing device equipped with a magnet, a clamper capable of fixing a grounding wire, and a plurality of claw pieces for scraping, a bracket made of a conductive member is provided to open the lower end surface of the magnet and hold the magnet. , a plurality of claw pieces spaced apart from each other are provided at the lower end of the bracket to protrude below the lower end surface of the magnet, the tips of these claw pieces are brought into contact with the ground surface, and the lower end surface of the magnet is spaced apart from the ground surface. A ground wire fixture characterized in that it is adapted to be installed.