JPS62247956A - Braking device for reach fork lift - Google Patents

Abstract

PURPOSE:To eliminate any braking actuation by footing by de-energizing an electromagnetic solenoid when an accelerator lever is manually turned to a braking actuation position by an operator whereby generating braking force by means of the mechanical energizing force of a brake mechanism. CONSTITUTION:When an operator rides on a vehicle, a limit switch 5 is turned on by his weight. Under this condition, when an accelerator lever 20 is operated with a key switch turned on, an accelerator switch 7 is turned on for energizing a solenoid 3. As a result, the brake is released while overcoming the spring force of a drum brake 1 by way of a link mechanism 4. In this state, when the accelerator lever 20 is operated back and forth, the vehicle can be driven. And after the accelerator lever 20 is shifted to a neutral position, its operation to the transversal direction causes the accelerator switch 7 to be turned off for de-energizing the solenoid 3. Resultantly, the link mechanism 4 is returned to its original position wherein the brake is applied by the spring force of the drum brake 1.

Description

[Detailed description of the invention] Regarding.

[Prior Art] As a conventional brake device for a reach forklift, there is one that employs a Getman brake system, as shown in FIG. 6, for example.

This brake device includes a drum brake 50 that is installed on the motor shaft of the drive motor M and limits the rotation of the motor shaft by mechanical biasing force (spring force), and is connected to the drum brake 50 via a link structure. The brake release pedal 55 resists the urging force and releases the υ1 limit on the transmission of the driving force when operated by the driver's legs.

[Problems to be Solved by the Invention] In the brake device as described above, the brake is normally applied, and when the reach forklift is driven, the driver continues to press the brake release pedal 55 to release the brake. maintain. On the other hand, when stopping the vehicle, the accelerator lever 20 is placed in the neutral position, and the brake release pedal 55 is released to apply the brakes.

In this way, the brake operation is performed by using the brake release pedal 55 by the foot (and the accelerator lever 2 by the hand).
0). This brake operation has poor operability due to the high depression height of the brake pedal, and there is also a problem in that the driver is easily fatigued because the brake release pedal 55 must be continuously depressed during driving.

The present invention was devised in view of the above problems, and an object of the present invention is to provide a brake device for a reach forklift that does not require brake operation with the legs, has good operability, and can reduce driver fatigue. shall be.

[Means for solving the problem] The brake device of the reach forklift 1- of the present invention is installed at a predetermined location of the drive mechanism of the reach forklift,
a brake mechanism that limits the transmission of driving force by a mechanical biasing force; and an electromagnetic solenoid that is disposed near the brake mechanism and releases the restriction on the transmission of the driving force by resisting the biasing force using an electromagnetic attraction force. driver detection means for detecting that the driver is on board at a predetermined position; lever position detection means for detecting that an accelerator lever for specifying the traveling state of the reach forklift is at a predetermined operating position; When the driver detecting means detects that the driver is riding at a predetermined position and the lever position detecting means detects that the accelerator lever is in the brake operating position, the power supply to the electromagnetic solenoid is cut off. ! Fi'rj power supply 1
1j 111 means. It is something.

This configuration eliminates the need to operate the brakes with the legs, reducing driver fatigue.

The reach forklift brake device of the present invention includes a brake mechanism, an electromagnetic solenoid, driver 1 detection means,
The main components are a lever position detection means and a power supply control means.

The brake mechanism is installed at a predetermined location of the drive mechanism and limits the transmission of drive force from the motor to the drive wheels. This brake mechanism stops the reach forklift or maintains the stopped state by restricting the transmission of driving force using a mechanical biasing force such as a spring force. As the brake mechanism, a conventional one such as a drum brake can be used as a component.

The electromagnetic solenoid is located near the Sfi brake mechanism and is connected to a power source via a power supply circuit. When power is supplied, the attractive force resists the urging force of the brake mechanism and releases the brake state (transmission restriction flA).

The driver detection means detects that the driver has boarded the vehicle at a predetermined position. The detection means is not particularly limited, and for example, a limit switch that is sensitive to the weight of the driver, a phytoswitch that optically detects the presence or absence of an object, etc. can be used.

The lever position detection means detects whether the accelerator lever, which specifies the running state (forward, backward, and speed) of the reach forklift, is at a predetermined brake operation position.

The power supply vIIi'l1 means cuts off power supply to the electromagnetic solenoid depending on the states of the driver detection means and lever position detection means. By this interruption, the 'R electromagnetic solenoid attraction force is released, and the transmission of the driving force is restricted by the biasing force of the brake mechanism.

This power supply control means is obtained by, for example, connecting the driver detection means and the lever position detection means in series to a power supply circuit for the electromagnetic solenoid using a battery power source. In this case, the driver detecting means and the lever position detecting means (which become components of the power supply control means) also connect the power supply circuit of the electromagnetic solenoid using the battery power, and the on/off control of the circuit is controlled by the driver via a relay. IIIll based on the detection signal from the detection means and the lever position detection means.
It is also possible to configure it with a microcomputer system.

[Function] Reach forklift equipped with brake KM of the present invention]-
In this case, before the driver gets on the vehicle, the transmission of driving force of the drive mechanism is limited by the mechanical biasing force of the brake mechanism. In other words, the brake is applied.

Then, when the key switch is turned on, the driver detecting means detects that the driver is in a predetermined position, and the accelerator lever is released from the brake operating position, power is supplied to the electromagnetic solenoid. As a result, the attraction force of W11 & the solenoid resists the mechanical biasing force of the brake mechanism and releases the restriction on the transmission of driving force. In other words, the brake is released.

In this state, the magnitude, magnitude, and direction of the driving force are controlled by the accelerator lever, and the reach forklift travels in a desired direction at a desired speed.

Also, when the accelerator lever is manually put into the brake operating position by the driver while the reach forklift is operating, and the lever position detection means detects this, the brake is activated. ! i & I
The power supply to the electromagnetic solenoid is cut off by the J til1 means. As a result, the transmission of driving force is limited by the mechanical biasing force of the brake mechanism.

does not require.

[Example] Specific examples of the present invention will be described based on FIGS. 1 to 5.

The braking device for a reach forklift in this embodiment has a drum brake 1, an electromagnetic solenoid 3, a limit switch 5, an accelerator switch 7, a battery power source 11, and a key switch 13 as main components. Also, as for the electrical configuration, '21! A magnetic solenoid 3, a limit switch 5, an accelerator switch 7,
A battery power source 11 and a key switch 13 are connected in series.

The drum brake 1 is installed on the motor shaft of a drive motor M of a reach forklift, and usually prevents rotation of the motor shaft by the biasing force of a spring and limits the transmission of driving force.

The electromagnetic solenoid 3 is fixed to a bracket 16 provided on the frame 15 of the reach forklift A, and the link mechanism 4
It is connected to the drum brake 1 via.

The limit switch 5 (driver detection means) is disposed below the floor mat 17 supported by a spring 18, and is fixed so as to turn on and off as the floor mat 17 moves up and down.

The accelerator switch 7 (lever position detection means) is installed in the accelerator lever box 19, and when the accelerator lever 20 is placed in the brake operating position (the dotted line position in Fig. 4), it is in the OFF state (brake operating state). Become. Note that the accelerator lever 20 specifies the y1 backward movement of the reach forklift by operating it in the front-rear direction (see FIG. 3). The accelerator switch 7 is in an on state during normal driving, and is turned off by operating the accelerator lever 20 laterally to cut off the power supply circuit. Note that the battery power source 11G is installed in the chiller leg 21, and the key switch 13 is installed in the top panel 22.

Next, the operation of the embodiment configured as described above will be explained. When the driver gets on the floor mat 17 of the reach forklift, the limit switch 5 is turned on due to the weight of the driver. When the key switch 9 is operated by the driver and turned on, and the accelerator lever 20 is placed in the solid line position in FIG. 4 to turn on the accelerator switch 7, power is supplied from the battery tRm11 to the electromagnetic solenoid 3.

When power is supplied to the electromagnetic solenoid 3, the link mechanism 4 is actuated by the attraction force thereof, and the restriction on the transmission of driving force is released against the biasing force of the spring of the drum brake 1. This causes the brake to be released. In this state, when the driver operates the accelerator lever 20 forward or backward as shown in FIG. 3, the reach forklift travels. After the accelerator lever 20 is in the neutral state (solid line in FIG. 3), when it is operated in the lateral direction, the accelerator switch 7 is turned off and the power supply to the electromagnetic solenoid is cut off. As a result, the link mechanism 4 returns to its original position, and the drive motor is prevented from rotating by the biasing force of the spring of the drum brake 1, thereby stopping the reach forklift.

As described above, according to the brake device of this embodiment, the driver rides on the floor mat 17, turns on the key switch 13, and moves the accelerator lever 20 to the driving position "W"(#J forward, reverse, and neutral). ), the biasing force of the drum brake 1 is released and the reach forklift becomes ready to travel.

Furthermore, even while the vehicle is running, the brakes can be applied by operating the accelerator lever 19. This eliminates the need for leg work to operate the brakes, reducing fatigue in the driver's legs.

[Effects of the Invention g1.1 The reach forklift brake device of the present invention includes a brake mechanism that is installed at a predetermined location of the drive mechanism of the reach forklift and that limits the transmission of driving force by a mechanical biasing force; an electromagnetic solenoid that is disposed nearby and uses an electromagnetic attraction force to release the restriction on the transmission of the driving force against the urging force; and a driver detection means that detects that the driver has boarded the vehicle at a predetermined position. lever position detection means for detecting that an accelerator lever for specifying the running state of the reach forklift is in a predetermined position; and power supply control means for cutting off power supply to the electromagnetic solenoid when the lever position detection means detects that the accelerator lever is in the brake operating position. Therefore, there is no need for the driver to operate the brake pedal with his or her legs. Therefore, the driver's leg fatigue is reduced. Furthermore, since the brake operation is performed using the accelerator lever, the reach forklift can be operated extremely easily.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view of a reach forklift equipped with a brake device according to an embodiment, Fig. 2 is a front view of the main part of Fig. 1, Fig. 3 is a side view showing the operation of the accelerator lever, Fig. 4
5 is a circuit diagram of the brake device according to the embodiment 4), and FIG. 6 is a partial perspective view of a reach forklift equipped with a conventional brake device. 1.50...Drum brake 3...Electromagnetic solenoid 4.54...Link mechanism 5...Limit switch 7...Accelerator switch 11...Battery power supply 13...Key switch 15... Frame 16・
...Bracket 17...Floor mat 18...
・Spring 19...Accelerator lever box 20...Accelerator lever 21...Reach leg 22...Top panel 5
5...Brake release pedal Δ...Reach forklift M...Drive motor Patent applicant M Co., Ltd.

Claims (6)

[Claims] (1) A brake mechanism that is installed at a predetermined location in the drive mechanism of the reach forklift and limits the transmission of driving force by mechanical urging force, and a brake mechanism that is placed near the brake mechanism and applies electromagnetic attractive force to the urging force. an electromagnetic solenoid that cancels the restriction on the transmission of the driving force; a driver detection means that detects that the driver has boarded the vehicle at a predetermined position; and an accelerator lever that specifies the running state of the reach forklift. lever position detection means for detecting that the accelerator lever is in the brake operating position; the driver detection means detects that the driver is riding in the predetermined position; and the lever position detection means detects that the accelerator lever is in the brake application position. A brake device for a reach forklift, comprising: a power supply control means that cuts off power supply to the electromagnetic solenoid when the electromagnetic solenoid is activated. (2) The braking device for a reach forklift according to claim 1, wherein the driver detecting means is a limit switch that is placed under the floor at the predetermined position and is sensitive to the weight of the driver. (3) The brake device for a reach forklift according to claim 1, wherein the driver detection means is a photoswitch that optically detects the presence or absence of an object at the predetermined position. (4) In claim 1, the power supply control means is constructed by connecting the driver detection means and the lever position detection means in series to a power supply circuit for the electromagnetic solenoid using a battery power source. Reach forklift brake equipment. (5) In claim 1, the power supply control means includes a power supply circuit for supplying power to the electromagnetic solenoid using a battery power source, and the driver detection means and the lever position detection means to detect whether the circuit is on or off. A reach forklift braking device consisting of a microcomputer system that controls based on signals from the vehicle. (6) The brake device for a reach forklift according to claim 1, wherein the brake mechanism is a drum brake installed on a motor shaft of a drive motor of the reach forklift.