JPS5829976A - Handle cover for preventing electric shock - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] When a person touches a metal door handle in a hotel room, hallway, office, etc. where the floor is covered with synthetic jutetan, the hand often receives an electric shock. Particularly, even if high-quality synthetic fiber jutan is laid down, during the dry season, the driver of a car may receive an electric shock as soon as he or she touches the handle when getting out of the car. The present invention relates to a handle cover for preventing electric shock that eliminates the above-mentioned drawbacks.

Causes of electric shock include rubbing of the soles of shoes or slippers with synthetic fiber jutan when a person walks on it;
Static electricity is generated by the peeling phenomenon when the soles of shoes or slippers leave the carpet while walking, and by friction between clothing and the synthetic resin sheet of the seat while driving a car. This creates a capacitor in which the dielectric material is the synthetic fiber Jutan, which has good electrical insulation, or the synthetic resin sheet from the car seat, and the human body and the floor of the building, or the human body and the metal part of the car, serve as the opposing electrodes. A power source is created that is charged with the electrostatic voltage generated above.The energy J of this power source is the generated electrostatic voltage V, and the capacitance of a capacitor whose opposing electrodes are the human body and the floor or the human body and the metal part of the car is C. This relational expression becomes J=1/2CV2.

In one case, when walking on synthetic jutan during the drying period and measuring the charging voltage, it was as high as 15 KV.

It is said that the capacitance of a capacitor constructed when the human body is in a three-dimensional posture is 100 to 300 PF.

As soon as the tip of the hand touches the handle, the energy of the power source becomes a discharge circuit through the foot, human body, tip of the hand, handle, door, floor, etc., and a discharge current suddenly flows through this circuit and disappears. Since the discharge current at this time is an impulse current, it flows in inverse proportion to the resistance present in series in the discharge circuit and in proportion to the capacitance of the capacitor.

The electric shock you receive at the tip of your hand occurs when the discharge current increases beyond a certain level, but this magnitude varies greatly depending on the person.

The method of preventing electric shock is to maximize the resistance existing in the discharge circuit, minimize the capacitance of the capacitor, and reduce the shock current in the discharge circuit until it no longer receives electric shock.

Conventionally, the hand touches the metal handle directly, so the resistance here is small, and the capacitor's capacity is short-circuited, so the shock current that flows in the discharge circuit is large, making it susceptible to electric shock.

The purpose of the present invention is to prevent electric shock by inserting a capacitor of high resistance and extremely small capacity between the hand and the metal handle to minimize the shock current flowing through the discharge circuit.

The present invention uses a synthetic resin with high volume resistivity, high dielectric breakdown strength, and low relative dielectric constant on the surface of the metal handle (5-1 of the Electrical Engineering Handbook Junior 3rd edition published July 10, 1954).
A synthetic resin with an internal volume resistivity of 1011 Ωcm or more, a dielectric breakdown strength of 15 KV/mm or more, and a relative dielectric constant of 9 or less, as shown in Tables 5 and 3, Properties of Various Insulating Materials, is used. In the specification of the present invention, one or two sheets of synthetic resin with high volume resistivity, high dielectric breakdown strength, and low relative dielectric constant
If the thickness of two or more layers is 0.2 mm or more, synthetic resin is foamed and combined to lower the dielectric constant, thereby reducing the capacity of the capacitor and reducing the shock current of the discharge circuit. It can also be reduced further. In order to test the presence or absence of electric shock of the electric shock prevention handle cover of the present invention, 3
When a power source is a 00PF capacitor charged with a DC voltage of 15KV and the electric shock prevention handle cover of the present invention is passed through the electric shock prevention handle cover of the present invention through the discharge circuit of this power source and the hand and human body are discharged, a total of 25 men, women, adults, and children will be affected by this shock current. Indoor temperature 0-3
Human experiments were conducted 10 times each at 5°C and humidity between 30% and 90%, and it was verified that no electric shock was received. The reason for not receiving this electric shock is that the electric shock prevention handle cover of the present invention has a very high internal resistance and a low dielectric constant, so the impact current is extremely small, so that it does not receive an electric shock.

The circuit for measuring the presence or absence of electric shock according to the present invention is shown in FIG. 1, and 1 is a DC high voltage generator, 2 is a voltmeter, 3 is a high voltage switching switch,
Numeral 4 is a capacitor with a capacitance of 300 PF, with the human body and the floor being relative electrodes and jutan or the like serving as a dielectric, 5 is a handle cover 6 for preventing electric shock of the present invention, and 7 is a metal handle.

Experimental method: First, put the high voltage switching switch 3 in A and charge the capacitor 4 with a high voltage of 15KV while checking with the voltmeter 2. Next, switch the high voltage switching switch 3 to B. Connect the capacitor 4 to the metal handle 6. Metal handle 6 that applies voltage 15KV
The electric shock prevention handle cover 5 of the present invention is placed over the surface of the electric shock, and the presence or absence of electric shock is measured by touching this surface with the finger 7.

The electric shock prevention cover of the present invention is made by stacking 20 0.05 mm thick synthetic resin sheets with high volume resistivity, high dielectric breakdown strength, and low relative dielectric constant, and this is attached to a metal handle. A 300PF capacitor charged at 15KV is applied to the metal handle, and one of the above sheets is applied until at least 1 person out of 25 people touches the surface of the electric shock prevention handle cover of the present invention and receives an extremely small electric shock. The total thickness of the sheets decreased by 1, and when it was confirmed that even 1 out of 25 people received an extremely small electric shock, the total thickness of the sheets increased by 1, and when it was confirmed that none of them received an electric shock, the total thickness of the sheets was 0.
The thickness was 2 mm or more, and in order to increase the safety factor, this thickness was doubled in the examples of the present invention.

Embodiment A (see Figure 2) A door in which a synthetic resin pipe 10 with a diameter larger than this (the pipe has a cut in one place in the length direction and is fitted into the base of the handle) is fitted into the base of the handle 6. The electric shock prevention device of the present invention is made by stacking four polyethylene sheets with a thickness of 0.1 mm as synthetic resin sheets with high volume resistivity, high dielectric breakdown strength, and low dielectric constant on the surface of the metal handle 6 of No. 8. A handle cover 5 is placed on top of the synthetic resin pipe 10 and tightened with a string 9. This embodiment shows the case of button locking. When locking, the button is pushed with the hand 7 onto the electric shock prevention cover of the present invention.

Example B (see Figure 3) The surface of the metal handle 6 of the door 8 is made of heat-shrinkable polyethylene with a thickness of 0.5 to 1 mm as a synthetic resin with high volume resistivity, high dielectric breakdown strength, and low relative permittivity. The pipe is hot-bonded 5, and the button lock is hole 11.
14 between the inside of this hole 11 and the metal handle 6.
A curtain 10 made of four layers of polyethylene sheets with a thickness of 0.1 mm is placed in the holder.Since this surface is soft, it is easy to press the button lock button.

Example C (see Figure 4) When the lock at the end of the metal handle is rotary, a synthetic resin with high volume resistivity, high dielectric breakdown strength, and small dielectric constant is used instead of curtain 10 in Figure 3. A case 13 with a thickness of 0.5 to 1 mm (polyethylene was used in the implementation) that enters the rotary lock handle 12 is attached to the rotary lock handle 12.
A gap is created between the metal handle 6 and the cover 5 placed over the surface of the metal handle 6 so that the metal handle 6 can be easily rotated. Make it easier.

Example D The surface of the metal handle that is touched by the hand is lined with heated polyethylene of 0.4 mm thickness as a synthetic resin with high volume resistivity, high dielectric breakdown strength, and low relative dielectric constant.

Example E A synthetic resin with high volume resistivity, high dielectric breakdown strength, and low dielectric constant was foamed on the surface of the metal handle that was touched by hands, and a single polyethylene sheet was foamed to particularly reduce the dielectric constant. (thickness 0.3-1mm) 0.1m on this surface
The electric shock prevention handle cover of the present invention is made from a layer of polyethylene sheets of m.m.

Example F A handle cover for preventing electric shock according to the present invention, in which a synthetic resin having high volume resistivity, high dielectric breakdown strength, and small dielectric constant is molded on the surface of the metal handle that is touched by the hand.

Example G (See Figure 5) Rotating lock handle 12 made of synthetic resin with high volume resistivity, high dielectric breakdown strength, and low relative permittivity.
It covers the outer surface 17 of the metal handle 6, and its tip has a thickness that allows a small gap to form a small gap with the surface of the bulge of the metal handle 6, and one or more recesses 16 are formed inside this tip. 4
A cylindrical cover with a bottom of mm or more is inserted into the metal handle 6. At this time, the recessed part 16 is pushed out by the bulge of the metal handle 6, but returns to its original shape after passing through this.

While handling the handle, the recess 16 gets caught in the bulge of the metal handle and cannot be easily removed. Rotating lock handle 12
There is a small gap between the surface of the metal handle 6 and the cover 15, so when the rotation lock handle 12 is rotated, the cover 15 rotates along with the rotation lock handle 12, but the metal handle 6 remains stationary. It is.

When handling the metal handle 6, it is grasped from above the cover 15 at the bulge of the metal handle, so this part of the cover 15 is slightly recessed so that the metal handle 6 can be easily turned due to friction with the metal handle. can.

Example H (see FIG. 6) This shows the case of a button lock.

A hole 11 is made in place of the rotation lock handle portion 17 of the electric shock prevention handle cover of the present invention described in Example G, and a hole 11 is formed in the gap 14 between the metal handle 6 and the cover with high volume resistivity and high volume resistivity. Curtain 1 made of four 0.1mm thick polyethylene sheets stacked as a synthetic resin with high dielectric breakdown strength and low relative dielectric constant.
Insert 0, press this to lock.

The embodiments described above have high volume resistivity, high dielectric breakdown strength,
Although we have specifically explained an example in which polyethylene is used as a synthetic resin with a low relative permittivity, it goes without saying that other synthetic resins with high dielectric breakdown strength, high volume resistivity, and small relative permittivity also yield good results. Nor.

The results of human experiments conducted on each of the above examples are as follows.

As a result of the test, high-quality synthetic jutetan was spread on the floor of a 9M2 room, and when I walked around the room five times wearing synthetic slippers, the voltage generated between the human body and the door handle was 10KV. As soon as I touched the handle, I received an electric shock so strong that my eyes caught fire. Twenty-five men, women, adults, and dwarfs conducted similar experiments one after another with electric shock prevention handle covers according to the various embodiments of the present invention attached, but none of them received electric shock, at a humidity of 51%. The temperature was 22°C.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram for measuring the presence or absence of electric shock, FIGS. 2 to 6 are explanatory diagrams, and FIG. 5b is a cross-sectional view of the harness portion of FIG. 5a. In the diagram: 1... DC high voltage generator 2... Voltmeter 3... High voltage switching switch 4... Capacitor 5... Electric shock prevention handle cover 6...
・Metal handle 7... Tip of hand 8... Door 9... String 10... Synthetic resin pipe 11... Hole 12... Rotating lock handle 13... Rotating lock handle case 1
4... Gap between the tip of the handle and the handle cover 15
... Handle cover for preventing electric shock 16 ... Recessed part 17 ... Cover for the tip of the rotation lock handle

Claims (1)

[Claims] (1) The surface of the metal handle of the door has a dielectric breakdown strength of 15
KV/mm or more, relative permittivity 9 or less, volume resistivity 1011
Electric shock prevention handle cover coated or coated with a synthetic resin electrical insulating material of Ωcm or more (at room temperature, 50 Hz) to a thickness of 0.2 mm or more (2) Synthetic resin electrical insulation of the standard specified in claim 1 Electric shock prevention handle cover (3) according to claim 1, in which two or more layers of materials with a thickness of 0.2 mm or more are covered and fixed on a metal handle (3) according to claim 1 Heat-bond standard heat-shrinkable synthetic resin electrical insulation material to the metal handle, make a hole in this part for the button lock,
Claim 1 of attaching a flexible curtain according to the above standard to this
Electric shock prevention handle cover (4) as described in Claim 1 A heat-shrinkable synthetic resin electric insulating material of the standard described in Claim 1 is thermally bonded to a metal handle, and a hole is made in this part in the rotation lock. A handle cover (5) for preventing electric shock according to claim 1, in which the rotary lock is covered with a synthetic resin cover according to the above standard, and a synthetic resin electric insulating material according to the standard according to claim 1. A handle cover for preventing electric shock according to claim 1, in which the surface of a metal handle is lined (6) A synthetic resin electric insulating material of the standard described in claim 1 is molded on the surface of a metal handle. Handle cover for preventing electric shock as described in claim 1 (7) Covering a metal handle with a foamed synthetic resin according to the standard as described in claim 1 alone or in combination with a regular sheet. Electric shock prevention handle cover (8) as set forth in claim 1. A cylinder made of synthetic resin according to the standard as set forth in claim 1 and having a wall thickness of 0.2 mm or more, and 1 on the inside of the inlet to be fitted into the metal handle. A handle cover for preventing electric shock according to claim 1, which has at least two recesses.