JPH089111Y2 - Ground wire winding device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable earth wire winding device for winding an earth wire for earthing (grounding) in a tape measure.

[0002]

2. Description of the Related Art Conventionally, when various electric devices are grounded via a ground wire, a ground wire pre-connected to the equipment is pulled out to be grounded, or a ground wire which is a single electric wire is connected to the equipment. It is common to separately connect to and ground to, and there are various ones that wind up and store the power supply cord, but there is no dedicated tool for the ground wire that can be freely taken up and stored.

By the way, the applicant of the present invention has filed Japanese Patent Laid-Open No. 4-195
As described in Japanese Patent Laid-Open No. 39, in order to collect minute objects such as footprints and hair in criminal investigations, etc., there is provided a portable minute object adsorption and sampling device that adsorbs and collects such minute objects by using static electricity. providing. This equipment uses a ground wire that grounds the main body that contains the high-voltage power supply device, etc., but in the past, this ground wire was fixedly installed on the main body and always pulled out to the outside by a certain length. Met. For this reason, when carrying the main body, it was very troublesome to bundle and wind the ground wire by hand so that the ground wire would not get in the way. Further, because of such annoyance, a long ground wire cannot be used, and the length of the main body has to be short enough not to hinder the carrying of the main body. For this reason, the ground wire often does not reach the groundable location, and the usability of the fine matter adsorption / collection device is poor.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to allow a sufficient length of the ground wire to be wound up and stored in a case and carried independently, and to have a desired length when used. An object of the present invention is to provide a ground wire winding device which can be easily connected to a device that is to be pulled out and grounded, has good operability, and is safe.

[0005]

According to the ground wire winding device of the present invention, a fixed shaft made of a conductive metal is provided in the center of an electrically insulating material case, and the electrically insulating material is made around the fixed shaft. The take-up drum is rotatably supported, and a spiral spring made of conductive metal is arranged between the fixed shaft and the inner peripheral surface of the take-up drum.The inner end of the spiral spring is fixed to the fixed shaft, while By fixing the end of the winding drum through a hole provided in the winding drum and fixing the end to the winding drum, a rotational force for winding rotation is applied to the winding drum. Then, the base end of the extension ground wire is connected to the protruding outer end of the spiral spring, the extension ground wire is wound around the outer periphery of the winding drum, and the extension ground wire is pulled out from the lead-out hole of the case. By connecting the base end of the connecting ground wire to one end of the fixed shaft on the outside of the, the connecting ground wire and the extending ground wire are electrically connected via the fixed shaft and the spiral spring. Further, a leaf spring-shaped drum stopper for restricting the rotation of the winding drum is mounted in the case, and a push button for operating the drum stopper is mounted on the outside of the case.

[0006]

In this earth winding device, the extension earth wire is electrically connected to the fixed shaft made of the same conductive metal via the spiral spring made of the conductive metal, and further electrically connected to the connecting earth wire via the fixed shaft. It is connected. The ground wire for extension is wound around a winding drum made of an electrically insulating material in a case made of an electrically insulating material, and the spiral spring made of a conductive metal is accommodated in the winding drum. Safe to. To ground using this grounding device, connect the tip of the connecting ground wire to the device to be grounded, while pulling out the extension ground wire for the required length and grounding the tip. Connected to the ground or directly contact the ground. When winding the extension ground wire around the winding drum, the winding strength and speed can be adjusted by adjusting the spring force of the drum stopper with the push button.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, this earth wire winding device has an electrically insulating material case 1 of a size that can be held by one hand as a main body, and a fixed shaft 2 made of a conductive metal is provided in the center of the case 1 so as not to rotate. A winding drum 3 made of an electrically insulating material is rotatably supported on the fixed shaft 2 in the case 1, and a spiral spring made of conductive metal is provided between the fixed shaft 2 and the inner peripheral surface of the winding drum 3. 4 are installed. The inner end portion 4a of the spiral spring 4 is fixed to the fixed shaft 2, and the outer end portion 4b is fixed to the winding drum 3 by projecting outward from a hole (not shown) provided in the winding drum 3. Has been done. As a result, the take-up drum 3 is given a rotational force for taking-up rotation in the counterclockwise direction in FIG.

On the outer circumference of the winding drum 3, one long (for example, about 10 m) extension ground wire 5 is wound. As shown in FIG. 2, the ground wire 5 is drawn out from a drawing hole 6 provided on the front surface of the case 1, and a clip member 7 is connected to the tip thereof. The base end of the ground wire 5 is connected to the outer end of the spiral spring 3 protruding from the outer peripheral surface of the winding drum 3 as described above, and since the spiral spring 3 is electrically conductive, the It is electrically connected to the conductive fixed shaft 2. The clip member 7 is
This is a conventionally known one in which most of the clip 8 made of conductive metal is covered with a rubber cover 9, and an L-shaped bent tip portion 8a of the clip 8 is projected from the rubber cover 9. In order to prevent dirt and dust attached to the ground wire 5 from entering the case 1 as the ground wire 5 is wound up, a mudguard sleeve 10 is provided on the outside of the draw-out hole 6 of the case 1,
A stopper 11 is fixed to the tip of the ground wire 5 near the clip member 7.

A leaf-spring-shaped drum stopper 12 for restricting the winding rotation of the winding drum 3 is mounted in the case 1, and the drum stopper 12 is provided outside the case 1.
A push button 13 for operating the is provided, and the drum stopper 12 and the push button 13 constitute an operation unit 14 for switching between rotation restriction of the winding drum 3 and cancellation thereof. Reference numeral 15 is a guide plate for guiding the ground wire 5 inside the case 1, and 16 is a carrying ring provided on the outside of the case 1.

The tip surface of the fixed shaft 2 is exposed to the outer surface of the case 1, and a screw 17 is inserted in a screw hole provided in the tip surface.
The grounding wire 18 for connection is electrically connected to the fixed shaft 2 outside the case 1 by screwing and fixing the base end of the grounding wire 18 for connection. Ground wire for this connection 1
A connection terminal 19 is provided at the tip of 8.

In order to use the earth winding device constructed as described above, the connecting terminal 1 at the tip of the connecting earth wire 18 is used.
9 is connected to the electric device 20 to be grounded, the extension ground wire 5 is drawn out, and the clip 8 at the tip thereof is used to sandwich a grounded object or to bring the clip 8 into direct contact with the ground. The electric device 20 has a grounding wire 1 for connection.
8, the fixed shaft 2, the spiral spring 4, the extension ground wire 5 and the clip 8 are grounded.

[0012]

The ground wire winding device of the present invention has the following effects. A ground wire of sufficient length can be wound and stored in the case and carried independently, and at the time of use, it can be easily connected to the equipment to be grounded by pulling out the desired length, so it is convenient to carry and use. . Since the extension ground wire that is wound up and the connection ground wire that is not wound up are electrically connected by using the fixed shaft for the winding drum and the spiral spring, it can be provided at low cost. , Can be miniaturized. The extension ground wire is wound on a winding drum made of an electrically insulating material in the case made of an electrically insulating material, and the spiral spring made of a conductive metal is accommodated in the winding drum, and the connecting ground wire is It is electrically safe because it is connected to one end of the fixed shaft and all of the electrically conducting portion is covered with electrical insulation. When winding the extension ground wire around the winding drum, the winding speed can be adjusted by adjusting the spring force of the drum stopper with the push button. If the length of the extension ground wire becomes long, the coil cannot be wound to the end unless the spring force of the spiral spring is increased. However, if this is done, the strength and speed at the beginning of winding will become too large, which is dangerous. In such a case, it is safe if the strength and speed of winding can be adjusted appropriately by operating the drum stopper with the push button.

[0013]

[Brief description of drawings]

FIG. 1 is a mechanism explanatory view of an example of an earth winding device according to the present invention.

FIG. 2 is a front view of the above.

[Explanation of symbols]

 1 Case 2 Fixed Shaft 3 Winding Drum 4 Spiral Spring 4a Spiral Spring Inner End 4b Spiral Spring Outer End 5 Extension Ground Wire 6 Drawout Hole 7 Clip Member 14 Operation Part 18 Connection Ground Wire

Claims (1)

[Scope of utility model registration request] 1. An electrically insulating material case is provided with a fixed shaft made of a conductive metal in the center thereof, and an electrically insulating material winding drum is rotatably supported around the fixed shaft. A spiral spring made of a conductive metal is arranged between the inner peripheral surface of the winding drum and the inner end of the spiral spring is fixed to the fixed shaft, while the outer end is projected from the hole provided in the winding drum. By fixing to the winding drum, a rotational force for winding rotation is applied to this winding drum, and the base end of the extension earth wire is connected to the protruding outer end of this spiral spring, and the extension earth wire is connected. This connection is made by winding a wire around the outer periphery of the winding drum to draw out an extension ground wire from the drawing hole of the case, and by connecting the base end of the connection ground wire to one end of the fixed shaft outside the case. For A line and extension ground wire, electrically connected via the fixed shaft and the spiral spring, in addition in the case,
A ground wire winding device characterized in that a leaf spring-shaped drum stopper for restricting the rotation of the winding drum is mounted, and a push button for operating the drum stopper is mounted on the outside of the case.