JPH0211216Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to improving the riding comfort of a driver seat installed in the driver's seat of a forklift.

BACKGROUND ART As shown in FIG. 4, the driver seat 3 of a forklift 1 has a standard layout installed on the engine hood 2, and the seating portion 3a of the driver seat 3 is designed to improve riding comfort. It is formed by a seat pad supported by a spring.

Problems that the invention aims to solve: Since the engine is located directly below the driver seat 3, the vibrations transmitted to the driver seat 3 are quite large, so it is difficult to absorb the vibrations with just the spring and seat pad, causing discomfort to the driver. Gives a sense of pleasure. Therefore, this invention was developed for driver seat 3.
The technical problem to be solved is to change the characteristics of the vibrations transmitted to the vehicle into characteristics that do not cause discomfort to the driver.

Means for Solving the Problem A planar vibrating body is inserted between the seat pad of the driver seat installed on the engine hood and the spring supporting the seat pad, and the vibration of the engine hood is detected by the engine hood. A detector is attached, and a phase shift circuit that can adjust the phase shift amount of the output signal from the detector and an amplifier that can adjust the gain of the output signal from the phase shift circuit and output it to the planar vibrating body are provided. did.

Effect The vibration felt by the driver seated in the driver's seat is a combination of the vibration transmitted from the engine hood and the vibration caused by the planar vibrator, so the driver adjusts the phase shift circuit and amplifier to transmit vibrations to the driver's seat. Change the vibration characteristics that are transmitted to you so that you do not feel uncomfortable.

Embodiments Hereinafter, specific embodiments of the present invention will be described based on the drawings. Reference numeral 3 denotes a driver seat disposed on the upper surface of the engine hood 2 of the forklift 1, and the seating portion 3a includes a seat pad 6 formed of an elastic member such as foam rubber whose lower surface is supported by a spring 5, and a lower surface of the seat pad 6 and the spring. 5
It is composed of a planar vibrating body 7 sandwiched between the seat pad 6 and an upper cover 8 that encloses the seat pad 6.
There is no difference from the conventional structure except that the planar vibrating body 7 is clamped. The planar vibrating body 7 includes a vibrating unit 7a and a diaphragm 7 acoustically coupled to the vibrating unit 7a.
It consists of b.

Furthermore, an acceleration pickup 9 for detecting the vertical vibration of the engine hood 2 and a controller 10 for amplifying the signal of the acceleration pickup 9 by shifting the phase thereof and outputting the signal to the planar vibrating body 7 are attached to the engine hood 2.

The controller 10 includes an amplifier 1 that amplifies the signal from the acceleration pickup 9 as shown in FIG.
1, a phase shift circuit 12 that shifts the phase of the signal from the amplifier 11, and an amplifier 13 that amplifies the output signal of the phase shift circuit 12 and outputs it to the planar vibrating body 7. Note that 12a and 13a are the phase adjustment knob of the phase shift circuit 12 and the amplifier 1, which are arranged in a position such as the instrument panel 4 that is easy for the driver to operate.
3 gain adjustment knob.

The operation of the present invention will be explained below. The vibration felt by the driver sitting in the driver seat 3 is a combination of the vibration transmitted from the engine hood 2 and the vibration of the planar vibrator 7, so the driver should adjust the phase adjustment knob 1.
2a and the gain adjustment knob 13a to change the characteristics of the composite vibration to create a vibration pattern that does not feel uncomfortable to the user.

Effects of the invention As mentioned above, the driver can operate a forklift without experiencing an unpleasant vibration sensation by changing the perceived vibration.Also, by changing the perceived vibration while driving for a long time, , which has the excellent effect of reducing fatigue.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of the driver seat and engine hood in which the present invention is implemented, Fig. 2 is a perspective view of the planar vibrating body, Fig. 3 is a block circuit diagram of the controller, and Fig. 4 is an overall side view of the forklift. It is a diagram. 2...Engine hood, 3...Driver seat, 5...Spring, 6...Seat pad, 7
... Planar vibrating body, 9 ... Acceleration pickup, 1
0...Controller, 12...Phase shift circuit, 11,
13...Amplifier.

Claims (1)

[Scope of utility model registration request] A forklift in which a driver seat is disposed on an engine hood includes a planar vibrating body sandwiched between a seat pad of the driver seat and a spring supporting the seat pad, and a detector for detecting vibrations of the engine hood. , a phase shift circuit that can adjust the phase shift amount of the output signal from the detector, and an amplifier that can adjust the gain of the output signal from the phase shift circuit and outputs it to the planar vibrating body. improvement sheet.