JPH0731050A - Electric shock preventive unit - Google Patents

Abstract

PURPOSE:To provide an electric shock preventive unit in which a worker is protected against electric shock when he touches a machine base side connector inadvertently. CONSTITUTION:When an outer door 15 is opened, the machine base side connector 7 in a housing 14 becomes touchable by hand. A second limit switch 11 detects opening of a cover body. Based on the detection, a third connector coil 12 opens the connection between a battery 1 and the machine base side connector 7 for charging. Consequently, the power supply voltage from the battery 1 is not applied to the machine base side connector 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric shock prevention device.

[0002]

2. Description of the Related Art Conventionally, for example, in a battery forklift truck, an electric motor is used as a driving source for traveling.
A battery mounted on the forklift is used as the power source of the electric motor. Then, this battery is periodically charged by the charging device.

FIG. 6 shows the electrical construction of the machine side of the charging device. The battery 41 is installed in the machine base and
It is connected to a controller 43 for controlling various electric devices via a normally open contactor contact 42 of the above. Further, in the battery 41, a part of the power source of the battery 41 passes through the second normally open contactor contact 44, and the key switch S of the battery forklift
Connected to W. The other end of the key switch SW is connected to the negative terminal of the battery 41 via the first contactor coil 45. Then, when the first contactor coil 45 is excited, the first normally open contactor contact 42 is closed.

In the battery 41, a charging connector (hereinafter referred to as a machine side connector) 46 is connected between the positive power source terminal and the negative power source terminal. Then, as shown in FIG. 5, the connector 46 is housed in a housing chamber 48 formed by recessing the side surface of the machine base 47. Then, at the time of charging, a charging connector (hereinafter, referred to as an external connector) 50 extending from a battery charger 49 installed outside is connected to the machine side connector 46 to perform charging.

A door 51 is provided in the accommodating chamber 48 to close the accommodating chamber 48 and shut it off from the outside when the battery is not charged so that a person cannot easily touch the machine base side connector 46. Therefore, when charging, the external connector 50 is connected to the machine side connector 46 by opening the door 51.

A limit switch 52 is provided at the opening of the accommodating chamber 48 so that when the door 51 is closed, it contacts the door 51 to turn it on, and when it opens, the door 51 separates and turns off. Has become. As shown in FIG. 6, one end of the limit switch 52 is connected to the battery 41, and the other end is connected to the battery 41 via the second contactor coil 53.
Is connected to the negative terminal of. Then, when the limit switch 52 is turned on, the second contactor coil 5
3 is excited to turn on (close) the second normally open contactor contact 44.

Accordingly, when the key switch SW is turned on during normal charging, the first contactor coil 45 is excited, and the controller 43 is supplied with operating power through the first normally open contactor contact 42. .

On the contrary, the door 51 is opened and the external connector 5
When 0 is connected to the machine side connector 46, the battery 41 is charged with DC power from the charger 49. At this time, since the door 51 is opened, the limit switch 52 is off and the second normally open contactor contact 44 is open. Therefore, even if the key switch SW is turned on at the time of charging, the power from the battery 41 is not supplied to the controller 43.

[0009]

However, since the machine-side connector 46 is wired in series with the battery 41, the machine-side connector 46 is not charged even when it is being charged.
Is on battery power. As a result, when charging, if the machine-side connector 46 is damaged for some reason, there is a risk of electric shock to the operator.

The present invention has been made in order to solve the above problems, and an object thereof is to provide an electric shock preventive device which does not cause an electric shock even if a machine-side connector is touched during charging. It is in.

[0011]

According to a first aspect of the present invention, a charging machine-side connector connected to a battery mounted on a vehicle and a machine-side connector provided on the machine frame of the vehicle are arranged. In addition, an accommodating chamber that accommodates an external charging connector that is connected to an external charger via a cord and that is connectable to the machine side connector, a lid that opens and closes the accommodating chamber, and an accommodating chamber When the lid detection means detects the open state of the lid and the lid detection means detects the open state of the lid, the wiring connecting the battery and the machine side connector for charging is connected. The gist of this invention is an electric shock preventive device consisting of an open circuit that opens.

According to a second aspect of the present invention, in addition to the first aspect of the invention, a connector detecting means provided in the accommodation chamber for detecting the presence / absence of accommodation of the external connector, and when the connector detecting means detects the external connector. The gist of the present invention is an electric shock prevention device including a cutoff circuit that cuts off power supply to an electric device connected to a battery.

[0013]

When the lid is opened, the machine side connector in the accommodation chamber is in a state where it can be touched by hand. At this time, the lid detecting means detects that the lid is opened. The open circuit opens the wiring that connects the battery and the machine-side connector for charging based on the detection by the detection means of the lid. As a result, the power supply voltage from the battery is not applied to the machine side connector.

Further, when the detecting means of the connector detects the external connector, the cutoff circuit cuts off the power supply to the electric equipment connected to the battery. As a result, the operating power is not supplied to each electric device during charging.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a battery forklift will be described below with reference to the drawings.

FIG. 1 is an electric circuit diagram showing the electrical construction of an electric shock prevention device provided on the machine base side. In FIG. 1, a battery 1 is mounted in a machine base, and its positive power supply terminal is connected to a controller 3 as an electric device via a first normally open contactor contact 2. Then, when the first normally open contactor contact 2 is closed, operating power is supplied from the battery 1 to the controller 3, and the controller 3 becomes operable. The controller 3 is for controlling various electric devices.

The positive power supply terminal of the battery 1 is the second
It is connected to the key switch 5 of the battery forklift truck through the normally open contactor contact 4 of. Key switch 5
The other end of the battery 1 via the first contactor coil 6
Is connected to the negative power terminal of. When the first contactor coil 6 is excited, the first normally open contactor contact 2 is closed.

A charging connector (hereinafter referred to as a machine side connector) 7 is connected between the positive power source terminal and the negative power source terminal of the battery 1. A normally closed contactor contact 8 forming an open circuit is connected to the wiring connecting the machine base side connector 7 and the positive power supply terminal of the battery 1.

Further, a first portion as a connector detecting means is provided between the positive power source terminal and the negative power source terminal of the battery 1.
The limit switch 9 is connected to a series circuit of a second contactor coil 10 which constitutes a cutoff circuit. When the first limit switch 9 is turned on and the second contactor coil 10 is excited, the second normally open contactor contact 4 is closed. Furthermore, a series circuit of a second limit switch 11 as a lid detecting means and a third contactor coil 12 forming an open circuit is connected between the positive power source terminal and the negative power source terminal of the battery 1. Then, when the second limit switch 11 is turned on and the third contactor coil 12 is excited, the normally closed contactor contact 8 is opened.

Next, the wiring structure of the machine side connector 7 and the first and second limit switches 9 and 11 will be described with reference to FIGS. The machine base side connector 7 is arranged and fixed in the inner part of the accommodation chamber 14 formed by recessing the outer surface of the machine base 13. The storage chamber 14 is provided with two doors 15 and 16 at the entrance opening and inside the storage chamber 14. A door (hereinafter, referred to as an external door) 15 as a lid of the entrance opening portion hangs downward from an upper portion through a hinge, and pivots upward and downward to open and close the accommodation chamber 14. As shown in FIG. 3, the outer door 15 is formed with a cord insertion opening 17 notched upward from the center of the lower side. The size of the cord insertion port 17 is such that a cord connected to the external connector 19 connected to the charger 18 can pass through and a human finger or the like cannot pass through.

A door (hereinafter referred to as an internal door) 16 in the accommodating chamber 14 hangs downward from the ceiling of the accommodating chamber 14 and pivots in the vertical direction toward the rear side, and the machine side connector 7 in the rear side.
The passage of the accommodating chamber 14 following is opened and closed. That is, when the external connector 19 is inserted into the accommodation chamber 14, the internal door 16 is opened to the back side, and the external connector 19 and the machine side connector 7 can be connected.

A second limit switch 11 is disposed below the entrance opening, and when the outer door 15 is closed,
It contacts the external door 15 and turns off (opens). On the contrary, when the outer door 15 is open, the second limit switch 11 is turned on (closed) apart from the outer door 15.

A first limit switch 9 is provided on the rear ceiling of the accommodation chamber 14, and when the inner door 16 is open, it comes into contact with the inner door 16 and turns off (opens). On the contrary, when the inner door 16 is closed, the first limit switch 9 is turned on (closed) apart from the inner door 16.

To charge the battery 1, the outer door 15 is opened by hand. When the outer door 15 is opened, the second limit switch 11 is closed. By closing the second limit switch 11, the third contactor coil 12 is excited, and the normally closed contactor contact 8 connected on the wiring of the machine side connector 7 is opened.

The external connector 19 is inserted into the accommodating chamber 14 from a state where the external door 15 is opened and the normally closed contactor contact 8 is opened. Then, the external connector 19 is inserted further into the interior, the internal door 16 is opened toward the interior, and the machine side connector 7 is connected. At this time, when the inner door 16 is opened to the back side, the first limit switch 9 is changed from the closed state to the open state. By opening the first limit switch 9,
The second contactor coil 10 is changed from excited to de-excited,
The normally open contactor contact 4 connected in series with the key switch 5 is opened.

Accordingly, since the normally open contactor contact 4 is opened, even if the key switch 5 is operated, the first contactor coil 6 is not excited and the first normally connected contactor 3 connected in series to the controller 3. The open contactor contact 2 remains open. That is, when the external connector 19 is connected to the machine side connector 7, the supply of operating power to the controller 3 is cut off, so that the controller 3 is in a dormant state.

Further, at this time, since the normally closed contactor contact 8 is open, the power source voltage of the battery 1 is not directly applied to the machine side connector 7. Therefore, when the external connector 19 is inserted, there is no danger of electric shock even if the connector 7 is accidentally touched. Especially, the machine side connector 7
This is effective when the terminal is exposed due to damage due to some reason.

When the connection of the external connector 19 is completed and the hand is taken out of the accommodation chamber 14 in this state, the external door 15 is lowered to close the accommodation chamber 14. At this time, since the cord 20 of the external connector 19 is inserted through the cord insertion opening 17 formed in the external door 15, the external door 15 cannot be caught by the cord 20 to completely close the accommodation chamber 14. Absent.

When the outer door 15 is closed, the second limit switch 11 is opened. By opening the second limit switch 11, the third contactor coil 12 is de-energized, and the normally closed contactor contact 8 connected to the wiring of the machine side connector 7 is closed. Therefore, charging is started, and charging is started by operating the charger 18.

When charging is completed and the external connector 19 is removed, the external door 15 is opened by hand. When the outer door 15 is opened, the second limit switch 11 is closed and the third contactor coil 12 is excited as described above, and the normally closed contactor contact 8 connected on the wiring of the machine side connector 7 is opened. To be done. Therefore, since the power source voltage of the battery 1 is not directly applied to the machine side connector 7, there is no fear of electric shock even if the machine side connector 7 is inadvertently touched when the external connector 19 is pulled out.

When the external connector 19 is pulled out from the machine side connector 7, the internal door 16 is closed, the first limit switch 9 is closed, and the second contactor coil 10 is closed.
To excite. Therefore, when the key switch 5 is closed, the operation power is supplied to the controller 3 to start the operation. Further, since the outer door 15 is also closed, the second limit switch 11 is also opened, the third contactor coil 12 is de-energized, and the normally-closed contactor contact 8 is closed. Further, if the external door 15 is opened carelessly after this charging, the normally-closed contactor contact 8 is opened, so there is no risk of electric shock.

Further, since the cord insertion opening 17 formed in the outer door 15 is large enough to allow the cord 20 much thinner than a human finger to be inserted, there is no need to insert a finger through the cord insertion opening 17. .

As described above, in this embodiment, the external connector 1
When 9 is inserted into and removed from the machine side connector 7,
Since the power source voltage of the battery 1 is not applied to the machine side connector 7, the worker can carry out the charging work without fear of electric shock.

Further, in a normal state without charging, for example, when the machine side connector 7 is inspected, the external door 15 is always opened, so that the machine side connector 7 is not supplied with the power source voltage of the battery 1. Can be inspected on condition.

The present invention is not limited to the above embodiment, but may be carried out as follows without departing from the spirit of the present invention. (1) Although the cord insertion opening 17 is formed by cutting out from the lower side of the external door 15, the present invention is not limited to this, and may be formed by cutting out from the vertical side of the external door 15. Further, although the outer door 15 and the inner door 16 are opened vertically, they may be opened horizontally. The outer door 15 may be a sliding door.

(2) The housing chamber 14 for housing the machine side connector 7 may be formed outside the machine base 13. That is, as shown in FIG. 4, the box-shaped cover 21 is connected to the outer surface of the machine base 13 so that one side can be pivotably opened and closed, and the housing chamber 14 is formed between the outer surface of the machine base 13 and the inside of the cover 21. Then, the machine side connector 7 is fixed to the outside surface of the machine base 13 in the accommodation chamber 14. Then, the cover 21 is opened to connect the external connector 19 to the exposed machine-side connector 7, and then the cover 2
1 is closed and charging is performed.

Then, the first limit switch 9 is installed on the inner surface of the cover 21 that abuts the external connector 19 when the cover 21 is closed and the external connector 19 is connected to the machine base side connector 7. On the other hand, the second limit switch 11 is installed on the outer surface of the machine base 13 side that abuts when the other end of the cover 21 is closed so that it can be detected that the cover 21 is closed. In this case, the cover 21 has the functions of the outer door 15 and the inner door 16 of the above-described embodiment.

When the cover 21 is opened in the same manner as in the above embodiment, the normally closed contactor contact 8 is always opened to prevent electric shock.

[0039]

As described in detail above, according to the present invention, even if the machine-side connector for charging is touched, the power-supply voltage of the battery is not applied to the machine-side connector, so there is no risk of electric shock and charging is performed. There is an excellent effect that work can be performed.

[Brief description of drawings]

FIG. 1 is an electrical circuit diagram showing an electrical configuration of an electric shock prevention device of the present invention.

FIG. 2 is a cross-sectional view showing an arrangement structure of a machine side connector 7, an external connector 19, first and second limit switches 9 and 11.

FIG. 3 is a perspective view of an open end of a storage chamber 14 seen from the outside of the machine base.

FIG. 4 is a perspective view showing another example.

FIG. 5 is a sectional view of a storage chamber 48 of a conventional electric shock preventive device.

FIG. 6 is an electric circuit diagram showing an electric configuration of a conventional electric shock prevention device.

[Explanation of symbols]

1 ... Battery, 3 ... Controller, 4 ... Key switch,
7 ... Machine side connector, 8 ... Normally closed contactor contact, 9 ... 1st limit switch, 10 ... 2nd contactor coil, 11 ... 2nd limit switch, 12 ... 3rd contactor coil, 13 ... Machine stand , 14 ... accommodation room, 15 ... external door, 18 ... charger, 19 ... external connector, 20 cord.

Claims (2)

[Claims] 1. A machine-side connector for charging, which is connected to a battery mounted on a vehicle, and a machine-side connector provided on the machine frame of the vehicle, the machine-side connector being arranged, and an external charger via a cord. An accommodating chamber that accommodates the connected external connector for charging and is connectable to the machine side connector, a lid that opens and closes the accommodating chamber, and an open state of the lid that opens and closes the accommodating chamber An electric shock prevention device comprising a lid detecting means for detecting and an open circuit for opening a wire connecting a battery and a machine side connector for charging when the lid detecting means detects the opened state of the lid. . 2. A charging machine-side connector connected to a battery mounted on the vehicle, and a machine-side connector provided on the machine stand of the vehicle, the machine-side connector being arranged, and an external charger via a cord. An accommodating chamber that accommodates the connected external connector for charging and is connectable to the machine side connector, a lid that opens and closes the accommodating chamber, and an open state of the lid that opens and closes the accommodating chamber A lid detecting means for detecting, an open circuit for opening the wiring connecting the battery and the machine side connector for charging when the lid detecting means detects the opened state of the lid, and Electric shock prevention that consists of a connector detection means that is provided to detect the presence or absence of an external connector and a cutoff circuit that shuts off the power supply to the electrical equipment connected to the battery when the connector detection means detects the external connector. apparatus.