JP2005067842A - Power feeding device for forklift truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate power feeding control of equipment arranged in a lifting body movable with respect to a body part of a forklift truck, without deteriorating appearance and increasing costs, in a power feeding device for the forklift truck. <P>SOLUTION: The power feeding device 5 provided for the forklift truck 1 supplies power by radio from a battery 43 arranged in the body part 2 to a laser pointer 41 arranged in the lifting body 3 via a light emitting device 47 and a light receiving device 42 (solar panel 42A), and controls power feeding from the battery 43 to the light emitting device 47 by a light quantity control device 53 arranged in the body part 2. Therefore, since power for operating the laser pointer 41 can be supplied by radio and devices such as a remote controller, and long wiring are not used, power feeding to the laser pointer 41 can be easily controlled without increasing costs. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power supply device for a forklift that supplies electric power from a main body of a forklift to a controlled object provided in a lifting body.

  2. Description of the Related Art Conventionally, a forklift power supply device for supplying electric power to an electric device such as a laser pointer disposed on an elevating body provided with a fork has been known (for example, see Patent Document 1).

  In this power supply device for forklifts, the above-described lifting body is provided with a storage battery and a solar battery panel. In normal times, the laser pointer is operated by the electric power stored in the storage battery while generating power with the solar battery panel. Moreover, when the amount of power generated by the solar cell panel and the amount of power stored in the storage battery become scarce, a headlamp provided in the forklift is irradiated to the solar cell panel to compensate for the amount of power generated by the solar cell panel.

This laser pointer is used for positioning when the fork provided in the forklift is inserted under the load, and is used for power saving and for avoiding unnecessary laser irradiation. The laser pointer is not actuated except when doing so. In other words, a switch is provided between the storage battery and the laser pointer so that the laser pointer can be switched on and off.
JP 2001-139298 A

  However, in the power supply device for forklifts, if the elevator body is provided with a switch for switching the laser pointer ON / OFF, a circuit for operating the laser pointer only inside the elevator body is formed. Therefore, compared to the case where a switch is provided in the main body of the forklift, the wiring can be shortened, but there is a problem that it is difficult to operate the switch from the driver's seat provided in the main body of the forklift. there were.

  Also, if the driver's seat is equipped with a laser pointer switch, the switch operation is easier than when the elevator body is equipped with a switch, but the wiring from the switch to the laser pointer and storage battery Since it is necessary to set in consideration of the movable range of the lifting body, there is a problem that a long wiring is required, which increases the cost and deteriorates the appearance.

  Further, in order to eliminate the long wiring routed from the lifting body to the main body, for example, it is possible to consider using an infrared remote control or the like. However, since an extra device is required, the cost increases.

  Therefore, in view of such a problem, in the power supply device for forklifts, power supply control of devices arranged on the lifting body movable with respect to the main body of the forklift can be easily performed without deteriorating the appearance and increasing the cost. It is an object of the present invention to do this.

  The forklift power supply device according to claim 1, which is made to achieve the above object, is raised and lowered with respect to the transmission unit and the main body unit arranged in the main body unit from the power source unit arranged in the main body unit of the forklift. It is configured to wirelessly supply power to a control target arranged in the lifting body via a receiving means arranged in the lifting body that can be transmitted from the power supply unit by the power feeding control means arranged in the main body unit. It is comprised so that the electric power feeding to may be controlled.

  In other words, even if the lifting body from the main body is configured to supply power wirelessly, if the lifting body has a power feeding control means for controlling power feeding to the controlled object, the operator operates the power feeding control means at the driver's seat. When trying to do so, either a means such as routing a long wiring with a wiring length set in consideration of the movable range of the elevating body or providing a device such as a remote controller for eliminating this wiring can be considered, In the present invention, the power supply from the power supply unit to the transmission unit is controlled by the power supply control unit arranged in the main body unit because the cost increases even if the unit is used.

  Therefore, with such a power supply device for forklifts (Claim 1), it is possible to supply power for operating the controlled object wirelessly, and there is no need to use a device such as a remote controller or a long wiring. Therefore, the power supply to be controlled can be easily controlled without increasing the cost.

  In the present invention, the receiving means and the controlled object do not need to be arranged on the same member (single elevating body). For example, the receiving means and the controlled object are different in the case where a plurality of elevating bodies that move up and down in stages are provided. The receiving means and the control target may be arranged on the lifting body.

  By the way, as a method of conveying power wirelessly from the transmitting means to the receiving means, for example, the surrounding magnetic flux is changed (transmitting means), the change in the magnetic flux is received by the coil (receiving means), and the electromagnetic force that induces the power is used. Wind power generation system that generates electric power by rotating the fan by rotating the fan with power from the power supply unit (sending means) and rotating another fan with power generation function by the wind (receiving means) It is possible to use it.

  However, if the electromagnetic induction method is used, the surrounding magnetic field is disturbed, which may adversely affect the instruments. Moreover, if it is a wind power generation system, there exists a possibility that the operation by an operator may become troubled with a wind.

  Therefore, as described in claim 2, it is preferable that the transmission unit transmits the electromagnetic wave, and the reception unit receives the electromagnetic wave transmitted by the transmission unit and converts the electromagnetic wave into electric power.

  With such a power supply device for forklifts (Claim 2), it is possible to supply electric power to the controlled object without adversely affecting the instruments or affecting the operation by the operator.

  Further, in the forklift power supply device according to claim 2, as described in claim 3, it is preferable that the forklift power supply device includes electromagnetic wave induction means for guiding electromagnetic waves from the transmission means to the reception means.

  That is, for example, when the transmission efficiency of electromagnetic waves is poor due to the positional relationship between the transmitting means and the receiving means, or when electromagnetic waves that are easily diffused due to the nature of electromagnetic waves are used, sufficient electromagnetic waves for the receiving means are used. Therefore, the present invention (Claim 3) is configured to induce electromagnetic waves in a desired direction using electromagnetic wave induction means. -ing

  With such a power supply device for forklifts (Claim 3), it is possible to efficiently transmit electromagnetic waves from the transmission means to the reception means regardless of the positional relationship between the transmission means and the reception means and the nature of the electromagnetic waves. .

  By the way, in the forklift power supply device according to claim 3, even when the positional relationship (distance) between the transmission unit and the reception unit changes, electromagnetic waves are generated so that the power supplied to the control unit does not change as much as possible. For transmission from the transmitting means to the receiving means, for example, the electromagnetic wave guiding means may guide the direction of the electromagnetic wave so as to track the receiving means in accordance with the position of the receiving means, but the configuration becomes complicated and the cost increases. End up.

  Therefore, in order to simplify the configuration and make it difficult for the power supplied to the control means to change even when the positional relationship between the transmission means and the reception means changes, the power supply to the control means is unlikely to change. The lifting body is configured to move linearly with respect to the main body, and the electromagnetic wave guiding means guides the electromagnetic waves transmitted from the transmitting means in a direction parallel to the lifting direction of the lifting body. Is preferred.

  Therefore, with such a power supply device for forklifts (Claim 4), even if the distance between the main body (receiving means) and the lifting body (receiving means) changes, it is possible to suppress the change in voltage, As a result, the controlled object can be stably operated.

  In addition, in the forklift power supply device according to claim 4, in order to specifically realize the induction of the electromagnetic wave from the transmission unit to the reception unit, for example, it is conceivable to induce the electromagnetic wave by an electromagnetic force or the like. As described in Item 5, the electromagnetic wave guiding means is constituted by a lens, and it is preferable that the electromagnetic wave is refracted and guided by this lens.

  That is, when the electromagnetic wave to be guided is light, the light may be refracted using an optical lens for the electromagnetic wave guiding means. When the electromagnetic wave to be guided is a radio wave, the electromagnetic wave is guided to the electromagnetic wave guiding means using a radio wave lens. May be refracted.

With such a power supply device for forklifts (Claim 5), directivity can be reliably imparted to the electromagnetic waves.
Next, in the forklift power supply device according to any one of claims 2 to 5, the electromagnetic wave transmitted from the transmitting unit is, for example, a microwave, and the receiving unit is a microwave transmitted by the transmitting unit. The transmission unit may be configured to generate light, and the reception unit may be configured by a photoelectric conversion unit capable of generating power using the light. It is preferable that it is comprised.

In other words, for example, when microwaves are transmitted / received, a high-frequency circuit, an antenna, and the like are required. Therefore, the present invention (claim 6) is configured to transmit / receive light.
In such a forklift power supply device (Claim 6), a high-frequency circuit, an antenna, or the like is not necessary, and a transmitting means including a lamp or a light-emitting diode, and a receiving means including a photodiode or a solar cell panel (photoelectric device). Therefore, it is possible to simplify the configuration of the transmission unit and the reception unit.

In general, electricity generated by power generation by rotation of a fan and power generation by high frequency is alternating current. Therefore, when used in an electric device that operates by direct current electricity such as a laser pointer, a rectifier circuit and a smoothing circuit are provided. I need it. On the other hand, since direct-current electricity can be obtained directly with photoelectric conversion such as a solar battery panel, the number of parts is small, the configuration can be simplified, and a highly reliable system can be constructed with cost reduction.

  Furthermore, in the power supply device for forklift according to claim 6, as described in claim 7, the photoelectric conversion means is provided with a light shielding member for blocking light other than light from the transmission means. It is desirable.

  Here, as a specific configuration of the light shielding member, for example, a light shielding wall that covers the periphery of the photoelectric conversion unit and makes it easy to receive light from the transmission unit, a filter that transmits only a specific wavelength, and the like are considered. It is done.

  With such a forklift power supply device (Claim 7), it is possible to make it difficult for the solar cell panel to be irradiated with light other than the light transmitted from the transmission means, so that the controlled object operates against the operator's intention. Can be prevented.

  In general, when the distance between the transmission unit and the reception unit increases, the transmission efficiency of energy (in the forklift power supply device according to any one of claims 2 to 7) decreases, and the reception unit Since the amount of power supplied to the controlled object tends to decrease, the power supply control means, as described in claim 8, is configured so that the power supply control means transmits the power amount supplied from the receiving means to the controlled object so as to be constant. It is preferable to control the amount of power supplied to the transmission unit according to the distance between the transmission unit and the reception unit.

  With such a forklift power supply device (Claim 8), stable power can be supplied to the controlled object regardless of the distance between the transmitting means and the receiving means.

  Embodiments according to the present invention will be described below with reference to the drawings.

  First, a forklift 1 on which a power supply device for forklifts according to the present invention is mounted will be described with reference to FIG. FIG. 1 is a side view (A) and a top view (B) showing the forklift 1 in a state where the elevating body 3 provided with the fork 11 is lowered.

  A forklift 1 shown in FIG. 1 includes a main body 2 having a driver's seat 15 for an operator to get on and sit on, and a lifting body 3 disposed so as to be movable up and down via a mast 14 disposed in front of the main body 2. , A counter-type forklift.

  In front of the driver's seat 15, a steering wheel 16 for steering the forklift 1 while traveling, a lever 17 for an operator to raise and lower the elevating body 3, and a laser pointer 41 described later (control in the present invention) And a switch 46 (see FIG. 2, power supply control means in the present invention) for switching ON / OFF of the headlamp 18 and the like. The lever 17 is installed on the right side of the driver's seat 15 at a position that can be easily reached by the operator.

  Further, a battery 43 (a power supply unit referred to in the present invention) that can be repeatedly charged is housed immediately below the driver's seat 15. The battery 43 includes a drive motor (not shown) for driving the forklift 1 and supplies power for operating all the devices provided in the forklift 1, and a light emitting device 47 described later. Electric power is also supplied to the laser pointer 41 via the (transmission means in the present invention) and the light receiving device 42 (reception means in the present invention). Therefore, the elevating body 3 is not provided with the battery 43.

  In front of and behind the main body 2, one front wheel 12 and one rear wheel 13 are provided on the left and right sides. The front wheel 12 is a free wheel and the rear wheel 13 is a drive wheel. The rear wheel 13 is also a steering wheel for driving the forklift 1 and for steering the forklift 1 in conjunction with the operation of the steering 16 by the operator.

  The bottom plate 14A connected to the vicinity of the lower end of the mast 14 is provided with a light emitting device 47 to be described later, and is located directly above the light emitting device 47 and in a portion of the mast 14 that moves in conjunction with the elevator 3. Includes a light receiving device 42 to be described later.

  And the elevating body 3 is provided with a fork 11 for passing under the load and placing the load, and a laser pointer 41 used for positioning when the fork 11 is inserted under the load. ing.

Next, the power supply device 4 for supplying power to the laser pointer 41 will be described with reference to FIG. FIG. 2A is a block diagram showing an outline of the power feeding device 4 and the lifting drive system.
As shown in FIG. 2A, the laser pointer 41 is electrically connected to the light receiving device 42 provided with a solar cell panel 42A (photoelectric conversion means in the present invention) by wiring, and is provided in the main body 2. The light emitting device 47 that is supplied with power from the battery 43 via the switch 46 and emits light irradiates the light receiving device 42 with light. When the solar cell panel 42A of the light receiving device 42 receives the light, the solar cell panel 42A generates electric power and supplies the electric power to the laser pointer 41.

  The battery 43 also supplies power to a lifting control device 44 for controlling the lifting operation of the lifting body 3 based on the operation of the operator. Moreover, the raising / lowering control apparatus 44 is comprised so that the hydraulic pump 45 may be driven by giving a drive pulse to the motor-driven hydraulic pump 45, for example.

  Here, the solar cell panel 42A has a characteristic in which power generation efficiency varies depending on the wavelength of the irradiated light, and the characteristic varies depending on the material of the solar cell panel 42A. In the present embodiment, the wavelength is 600 to 900 nm. The solar cell panel 42 </ b> A that can generate power most efficiently when the light is irradiated is used.

Next, details of the light-emitting device 47 will be described with reference to FIG. FIG. 2B is a cross-sectional view showing the light emitting device 47.
The light emitting device 47 has a substantially cylindrical shape. As shown in FIG. 2B, the light emitting device 47 is disposed so as to surround the lamp 61 disposed at the center of the bottom of the light emitting device 47 and the periphery of the lamp 61. A reflecting plate 62 for reflecting in the direction and a lens 63 (electromagnetic wave guiding means in the present invention) arranged at a position to cover the internal space formed by the reflecting plate 62 are provided.

  The lamp 61 is a halogen lamp, for example. Since this halogen lamp has a characteristic of irradiating a large amount of light having a wavelength of 700 to 1000 nm, for example, a high pressure sodium lamp having a characteristic of irradiating a large amount of light having a wavelength of 550 to 650 nm is applied to the lamp 61. In contrast to the case where it is used, the solar cell panel 42A can efficiently generate power.

  The lamp 61 is connected to a switch 46 disposed in front of the driver's seat 15 via a wiring 64. When the switch 46 is operated by an operator, the lamp 61 is turned on according to the operation. -It is configured to be switched off.

  The lens 63 is made of, for example, an aspheric lens made of glass, and direct light from the lamp 61 and reflected light reflected by the reflecting plate 62 are transmitted through the lens 63 to give directivity. It is set to form parallel rays.

Next, the light receiving device 42 will be described with reference to FIG. FIG. 3 is a perspective view (A) and a bottom view (B) showing the light receiving device 42.
As shown in FIGS. 3A and 3B, the light receiving device 42 has a cylindrical shape with the upper surface closed, and the lower side is open. A solar cell panel 42 </ b> A is arranged on the upper surface inside the light receiving device 42. Further, the side surface of the light receiving device 42 functions as a light shielding wall 42B. By directing the opening of the light receiving device 42 downward, it is difficult for light such as sunlight or illumination to be irradiated on the solar cell panel 42A. Yes. On the other hand, the light irradiated from directly below is irradiated to the solar cell panel 42A without being blocked.

  By the way, when the lifting body 3 provided with the fork 11 is moved upward from the state shown in FIG. 1, the state shown in FIG. 4 is obtained. At this time, the light emitting device 47 and the light receiving device 42 are positioned apart from each other by the amount that the elevating body 3 has moved upward. However, since the light emitted from the light emitting device 47 is transmitted through the lens 63, the light is converted into parallel rays, and the elevating body 3 moves in parallel with the parallel rays, so that the solar cell panel 42A includes a solar cell. A sufficient amount of light is generated to generate enough power for the panel 42A to operate the laser pointer 41.

  In the power supply device 4 described in detail above, the light emitting device 47 disposed in the main body 2 and the lifting body 3 capable of moving up and down with respect to the main body 2 from the battery 43 disposed in the main body 2 of the forklift 1. The power is wirelessly supplied to the laser pointer 41 disposed on the lifting body 3 via the light receiving device 42 disposed on the body 3, and the light emitting device 47 is connected from the battery 43 by the switch 46 disposed on the main body 2. It is comprised so that the electric power feeding to may be controlled.

  Therefore, power for operating the laser pointer 41 can be supplied wirelessly, and a device such as a remote controller or a long wiring is not used, so that the laser pointer 41 can be easily fed without increasing costs. Can be controlled.

  The light-emitting device 47 transmits light, and the light-receiving device 42 receives light transmitted by the light-emitting device 47, and converts this light into electric power by the solar battery panel 42A. It is possible to supply power to the laser pointer 41 without adversely affecting the functions or affecting the operation by the operator. In addition, with such a configuration, compared with the case where microwaves are used instead of light, a high-frequency circuit, an antenna, or the like is not necessary, so that the configurations of the light emitting device 47 and the light receiving device 42 can be simplified. .

  Furthermore, since the power feeding device 4 includes the lens 63 for guiding electromagnetic waves from the light emitting device 47 to the light receiving device 42, light can be efficiently transmitted from the light emitting device 47 to the light receiving device 42. In addition, since the lens 63 is configured to transmit light, directivity can be reliably given to the light.

  In addition, the lifting body 3 is configured to move up and down linearly with respect to the main body 2 along the mast 14, and the lens 63 transmits light transmitted from the light emitting device 47 in the lifting direction of the lifting body 3. Since the light receiving device 42 is disposed at a position in the lifting body 3 where light can be received, the main body 2 (light receiving device 42) and the lifting body 3 (light receiving device 42). ), The change in the electric power generated by the solar cell panel 42A can be suppressed, and the laser pointer 41 can be stably operated.

  Further, since the solar cell panel 42A is provided with a light shielding wall 42B for blocking light other than the light from the light emitting device 47, the light shielding wall 42B allows light other than light transmitted from the light emitting device 47 to be transmitted. Since it is possible to make it difficult for light to be irradiated to the solar cell panel 42A, it is possible to prevent the laser pointer 41 from operating against the intention of the operator.

  In the present embodiment (embodiment 1), both the light receiving device 42 and the laser pointer 41 are configured to be disposed on the lifting body 3. However, there is no particular need for such a configuration. For example, the lifting body 3 However, in the case where it is configured to move up and down stepwise, the light receiving device 42 may be disposed on the mast 14 that moves up and down in conjunction with the lifting body 3, and the laser pointer 41 may be disposed on the lifting body 3.

  In the present embodiment (embodiment 1), light is used as a method of wirelessly conveying power from the light emitting device 47 to the light receiving device 42. However, there is no particular need for such a configuration. An electromagnetic induction method in which the magnetic flux is changed, the change in the magnetic flux is received by the coil, and electric power is induced may be used, or the fan is rotated by the electric power from the battery 43 to send the wind, and the wind generates the power generation function. A wind power generation system in which another fan is rotated to generate electric power may be used, or a microwave system in which the microwave generated by the light receiving device 42 is received by the light emitting device 47 may be used.

  Further, in the present embodiment (embodiment 1), the light emitting device 47 and the light receiving device 42 are arranged so as to be parallel to the moving direction of the elevating body 3, and the parallel light from the light emitting device 47 is maintained in a certain direction. However, there is no particular need for such a configuration. For example, an optical fiber or the like may be disposed at a position where parallel light from the light emitting device 47 passes to guide the light to the light receiving device 42. In addition, a guidance device that guides the direction of light so as to track the light receiving device 42 according to the position of the light receiving device 42 may be used.

  In the present embodiment (embodiment 1), the lens 63 is used to guide light from the light emitting device 47. However, there is no particular need to do this, for example, electromagnetic waves such as a television cathode ray tube are used. You may comprise so that light may be induced | guided | derived by force.

  Next, another embodiment of the power supply device 5 will be described. The power feeding device 5 described in the present embodiment (second embodiment) is different from the power feeding device 4 of the first embodiment only in that the amount of light emitted from the light emitting device 47 can be controlled. The configuration is the same as that of the power supply device 4 of the first embodiment. Therefore, in the present embodiment (embodiment 2), only the portions where the power feeding device 5 of the present embodiment (second embodiment) is different from the power feeding device 4 of the first embodiment will be described in detail, and this embodiment (second embodiment). The same reference numerals are assigned to the same portions of the power supply device 5 and the power supply device 4 of the first embodiment, and the description thereof is omitted.

First, the power supply device 5 for supplying power to the laser pointer 41 will be described with reference to FIG. FIG. 5 is a block diagram showing an outline of the power feeding device 5 and the lifting drive system.
The power supply device 5 is provided with a light amount control device 51 (power supply control means in the present invention) instead of the switch 46 in the power supply device 4 of the first embodiment. The light quantity control device 51 has a function of controlling the voltage of power supplied from the battery 43 to the light emitting device 47. In addition, a switch 53 is provided for cutting off the electric power supplied to the light emitting device 47 through the light amount control device 51 by the operation of the operator.

In addition, this switch 53 is arrange | positioned ahead of the driver's seat 15 (refer FIG. 1) similarly to the switch 46 in the electric power feeder 4 of Example 1. FIG.
In addition, a pulse sensor 52 is connected to the light quantity control device 51, and this pulse sensor 52 is for detecting a drive pulse for the lift control device 44 to drive and control the motor of the hydraulic pump 45. .

  The light quantity control device 51 calculates the position of the lifting body 3 based on the detection from the pulse sensor 52 and supplies power to the light emitting device 47 based on the position (that is, the distance between the light emitting device 47 and the light receiving device 42). To control the voltage.

  The position of the lifting body 3 and the voltage controlled according to the position are stored in advance as a database in the light quantity control device 51, and the solar cell panel 42A generates power by accessing this database as needed. The amount of light emitted from the light emitting device 47 is continuously controlled so that the voltage is constant.

  In such a power feeding device 5, the light amount control device 51 is configured to emit light according to the distance between the light emitting device 47 and the light receiving device 42 so that the voltage supplied from the light receiving device 42 to the laser pointer 41 is constant. Since the amount of power supplied to 47 is controlled, stable power can be supplied to the laser pointer 41 regardless of the distance between the light emitting device 47 and the light receiving device 42.

  In the power supply device 5 of the present embodiment (embodiment 2), the light amount control device 51 continuously controls the voltage supplied to the light emitting device 47 according to the position of the lifting body 3. The voltage may be controlled step by step according to the position of the lifting body 3.

  Next, another embodiment of the power supply device 6 will be described. The power supply device 6 described in the present embodiment (third embodiment) is such that the control for turning on / off the light emitted from the light emitting device 47 can be automatically controlled by the magnet sensor 70. The other configurations are the same as those of the power supply device 4 of the first embodiment. Therefore, in the present embodiment (third embodiment), only the portions where the power feeding device 6 of the present embodiment (third embodiment) is different from the power feeding device 4 of the first embodiment will be described in detail, and this embodiment (third embodiment). The same reference numerals are assigned to the same portions of the power supply device 6 and the power supply device 4 of the first embodiment, and the description thereof is omitted.

First, the power supply device 6 for supplying power to the laser pointer 41 will be described with reference to FIG. FIG. 6 is a block diagram showing an outline of the power feeding device 6 and the lifting drive system.
The power feeding device 6 is provided with a magnet sensor 70 (power feeding control means in the present invention) instead of the switch 46 in the power feeding device 4 of the first embodiment.

Next, the magnet sensor 70 will be described with reference to FIG. FIG. 7 is an explanatory view showing the attachment position of the magnet sensor 70.
Here, before describing the magnet sensor 70, first, the support structure of the mast 14 will be described.

  As shown in FIG. 7, the mast 14 is supported so as to be rotatable with respect to the main body 2 with the rotation support portion 73 as a central axis of rotation. With this support structure, the mast 14 is held vertically with respect to the ground when the load is not placed on the lifting body 3, and the load drops if the load is placed on the lifting unit 3. In order to make it difficult, it is configured to be held at a slight angle. That is, if it is in the state where the load was loaded on the raising / lowering part 3, it will be hold | maintained, for example in the position shown with the dashed-dotted line of FIG.

  The laser pointer 41 is used when loading a load on the elevating unit 3. When the load is not loaded on the elevating unit 3, the laser pointer 41 is turned on and the load is loaded on the elevating unit 3. When it is, the laser pointer 41 is set to be turned off. For this reason, it arrange | positions so that the inclination of the mast 14 can be detected.

  As shown in FIG. 7, the magnet sensor 70 includes a detection unit 71 that functions as a switch and a detected unit 72, and only when the detected unit 72 is detected by the detection unit 71, the detection unit 71 The switch 71 is turned on.

  The detection unit 71 is arranged on a member that is not affected by the rotation of the mast 14 and is closer to the main body 2 than the rotation support unit 73. The detected portion 72 is disposed on the mast 14 and moves with the rotation of the mast 14.

  The detected portion 72 is configured to be detected by the detecting portion 71 when no load is placed on the elevating portion 3 (that is, when the detected portion 72 is located at a position indicated by a solid line). In addition, when a load is placed on the elevating unit 3 (that is, when the detected unit 72 is positioned at a position indicated by a one-dot chain line), the detection unit 71 is configured to move to a position that cannot be detected. ing.

  Therefore, with such a power supply device 6, in addition to the effects described in the first embodiment, it is possible to automatically control ON / OFF of the laser pointer 41 without an operator's operation.

  In addition, since the laser pointer 41 is not operated when a load is loaded on the lift 3, power can be saved.

It is the side view (A) and top view (B) which show the forklift of the state which lowered the raising / lowering body with which the fork was equipped. It is a block diagram (A) which shows the outline of an electric power feeder and a raising / lowering drive system, and sectional drawing (B) which shows a light-emitting device. It is the perspective view (A) which shows a light-receiving device, and a bottom view (B). It is the side view (A) and top view (B) which show the forklift of the state which raised the raising / lowering body with which the fork was equipped. It is a block diagram which shows the outline of the electric power feeder of Example 2, and a raising / lowering drive system. It is a block diagram which shows the outline of the electric power feeder of Example 3, and an raising / lowering drive system. It is explanatory drawing which shows a magnet sensor attachment position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Forklift, 2 ... Main-body part, 3 ... Lifting body, 4, 5 ... Feeding device, 11 ... Fork, 12 ... Front wheel, 13 ... Rear wheel, 14 ... Mast, 14A ... Bottom plate, 15 ... Driver's seat, 16 ... Steering , 17 ... Lever, 41 ... Laser pointer, 42 ... Light receiving device, 42A ... Solar cell panel, 42B ... Light shielding wall, 43 ... Battery, 44 ... Lift control device, 45 ... Hydraulic pump, 46 ... Switch, 47 ... Light emitting device, DESCRIPTION OF SYMBOLS 51 ... Light quantity control apparatus, 52 ... Pulse sensor, 53 ... Switch, 61 ... Lamp, 62 ... Reflecting plate, 63 ... Lens, 64 ... Wiring, 70 ... Magnet sensor, 71 ... Detection part, 72 ... Detected part.

Claims (8)

In order to wirelessly supply electric power from a power supply unit arranged in the main body part of the forklift to a control object arranged in an elevating body that can be raised and lowered relative to the main body part, they are arranged in the main body part and the elevating body, respectively. Transmitting means and receiving means;
A power supply control unit disposed in the main body unit for controlling power supply from the power supply unit to the transmission unit;
With
The forking lift power supply device, wherein the control object is supplied with power from the receiving means. The transmission means transmits electromagnetic waves,
2. The forklift power supply device according to claim 1, wherein the reception unit receives the electromagnetic wave transmitted by the transmission unit and converts the electromagnetic wave into electric power.   The forklift power feeding device according to claim 2, further comprising an electromagnetic wave guiding unit for guiding the electromagnetic wave from the transmitting unit to the receiving unit. The lifting body is configured to move linearly with respect to the main body,
The forklift power feeding device according to claim 3, wherein the electromagnetic wave guiding means guides the electromagnetic wave transmitted from the transmitting means in a direction parallel to a lifting direction of the lifting body.   The forklift power feeding device according to claim 4, wherein the electromagnetic wave guiding means is constituted by a lens. The transmitting means is configured to generate light;
The forklift power feeding device according to any one of claims 2 to 5, wherein the receiving unit is configured by a photoelectric conversion unit capable of generating electric power with the light.     The forklift power feeding device according to claim 6, wherein the photoelectric conversion unit includes a light blocking member for blocking light other than the light from the transmission unit.   The power supply control means determines the amount of power supplied to the transmission means according to the distance between the transmission means and the reception means so that the amount of power supplied from the reception means to the control target is constant. It controls, The electric power feeder for forklifts in any one of Claims 1-7 characterized by the above-mentioned.

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