JP2014108877A - Forklift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forklift which easily secures visibility and reduces operator's fatigue.SOLUTION: A forklift includes: a fork shift device 21 which enables side shifting of a fork 22; and a cabin 14 where a driver seat is housed in a vehicle body 11. In the vehicle body 11, the cabin 14 is installed so as to move in a vehicle width direction and a cabin shaft device 31 which moves the cabin 14 in a predetermined range in the vehicle width direction is provided. The forklift is provided with a shift interlock mechanism which operates the cabin shaft device 31 in conjunction with the fork shift device 21 and may move the cabin 14 in the same direction as the fork 21 or in the opposite direction.

Description

  The present invention relates to a forklift including a fork shift device capable of side shifting a fork and a cabin in which a driver's seat is accommodated.

  The present applicant has proposed a technique in which the cabin is tilted forward and upward in Patent Document 1 in order to reduce the operator's fatigue due to line-of-sight movement looking up upward when stacking loads high.

JP 2004-35155 A JP2010-42926

  By the way, Patent Document 2 discloses that a fork shift device that can move the fork in the vehicle width direction is provided in the carriage (lift bracket) in order to easily align the fork when it is inserted into the pallet or the bottom of the load. Proposed.

  In front of the cabin, a mast, a carriage, a lifting chain, piping, and the like for raising and lowering the fork are installed, and the front view from the cabin is limited. For this reason, the operator has moved and adjusted the body and head so that the fork tip and the fork insertion position of the load can be sufficiently observed in accordance with the position of the fork shifted by the fork. For this reason, there has been a problem that operator fatigue increases due to these operations.

  An object of the present invention is to provide a forklift that solves the above-described problems and can reduce operator fatigue.

The invention described in claim 1
A forklift comprising a fork shift device capable of side shifting a fork and a cabin in which a driver's seat is housed in a vehicle body,
In the vehicle body, a cabin is installed so as to be movable in the vehicle width direction, and a cabin shift device capable of moving the cabin in a predetermined range in the vehicle width direction is provided.
A shift interlocking mechanism capable of operating the cabin shift device in conjunction with the fork shift device and moving the cabin in the same direction as the fork or in the opposite direction is provided.

The invention according to claim 2
The shift interlock mechanism includes a shift detector that detects the operation of the fork shift device,
Based on the detection signal of the shift detector, an interlock controller that operates the drive device of the cabin shift device,
It is provided with a shift interlock switch that can be switched to a cabin interlock stop and interlock in the same direction as the fork, or in an opposite direction to the cabin fork.

  According to the first aspect of the present invention, by moving the cabin in the vehicle width direction in conjunction with the side shift of the fork, the operator at the driver's seat can cope with the change in the visibility of the loaded load and the fork tip. Can be changed, and a good view of the load and the tip of the fork can be secured. Therefore, unlike the conventional case, it is not necessary for the operator to adjust the field of view by moving the body or head, so that workability can be improved and fatigue can be reduced.

  According to the invention described in claim 2, in accordance with the situation at the work site, it is possible to select the moving direction or stop of the cabin with respect to the shift direction of the fork by the shift interlock switch, improving the usability and improving the work efficiency. Can be improved.

It is a perspective view which shows Example 1 of the forklift which concerns on this invention. It is a top view of a forklift. It is a side view of a forklift. It is a disassembled perspective view which shows a fork shift apparatus. It is a block diagram which shows a shift interlocking mechanism. It is a block diagram which shows the shift interlocking mechanism of Example 2. FIG.

[Example 1]
Hereinafter, a forklift according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 3, this forklift is provided with a lift device 13 at the front portion of a vehicle body 11 having a front wheel 12 </ b> F for driving and a rear wheel 12 </ b> R for steering, and a front portion of the vehicle body 11. Close to the cabin 14 having a driver's seat 14a.

  The lift device 13 has a mast device 15 that is extendable and retractable via a support (not shown) near the bottom at the front of the vehicle body 11, and the mast device 15 can be tilted by a pair of left and right tilt cylinders 15a. It is supported. In the mast device 15, the inner mast is guided to extend and retract in the outer mast, and the inner mast is driven up and down by the lift cylinder 16. A pair of left and right sheaves 17 are supported on the upper portion of the inner mast, and an elevating chain 18 having a base end fixed to the bottom of the outer mast is wound around the sheave 17 and guided to the inner mast so as to be movable up and down. It is connected to the carriage 19. Therefore, by moving the lift cylinder 16 and raising the inner mast, the sheave 17 can be raised and the carriage 19 can be raised at double speed.

  As shown in FIG. 4, the carriage 19 is provided with a fork shift device 21 that can side-shift a pair of left and right forks 22 in the vehicle width direction. The fork 22 is supported by the lift frame 23 via a support shaft 23a in the vehicle width direction, and the vehicle width of the pair of forks 22 is interposed between the lift frame 23 and the fork 22 via a screw shaft 24a and a female screw member 24b. A fork position adjusting device 24 for adjusting the position in each direction is provided.

(Fork shift device)
In the fork shift device 21, the slide bracket 19a on the upper portion of the carriage 19 is slidably fitted to the slide shaft 25 supported in the vehicle width direction by the lift frame 23 via the support bracket 23b. Is slidably supported within a predetermined range. A fork shift cylinder 26 is connected between the carriage 19 and the lift frame 23. As shown in FIG. 5, a lever-type fork shift switch 27 for operating the fork shift device 21 is installed in the cabin 14. A main hydraulic pipe 35 to which pressure oil is supplied from the hydraulic pump P is connected to the fork shift cylinder 26 via the fork shift valve 30. The pilot hydraulic pipes 29R and 29L are connected to the pilot valves 30R and 30L of the fork shift valve 30 from the pilot operation valves 28R and 28L for fork shift operated by the fork shift switch 27.

  Therefore, by operating the fork shift switch 27 and operating the left and right pilot operation valves 28R, 28L, the pilot hydraulic pressure is sent to the pilot valves 30R, 30L, and the fork shift valve 30 is operated. Then, the hydraulic pressure discharged from the hydraulic pump P is sent from the fork shift valve 30 to the fork shift cylinder 26.

(Cabin shift device)
The cabin 14 is provided with a cabin shift device 31 that side-shifts the cabin 14 in the vehicle width direction. The cabin shift device 31 includes a cabin guide device 32 and a cabin drive device 33. As shown in FIG. 2, the cabin guide device 32 is configured such that the cabin 14 is supported by a pair of left and right guide rails 32 a laid on the vehicle body 11 in the vehicle width direction via a thrust bearing so as to be movable in the vehicle width direction. Yes. The cabin drive device 33 is constituted by a double rod type cabin shift cylinder 33a which is a linear drive device. The cylinder body of the cabin shift cylinder 33a is fixed to the vehicle body 11, and the left and right end portions of the rod are connected to the cabin 14. Each is connected to the bottom. Then, the hydraulic pressure of the hydraulic pump P is supplied to the cabin shift cylinder 33a via the cabin shift valve 34.

(Shift interlock mechanism)
This forklift is provided with a shift interlocking mechanism 41 that can operate the cabin shift device 31 in response to the operation of the fork shift device 21. That is, as shown in FIG. 5, the pilot hydraulic pipes 29R and 29L are provided with shift hydraulic sensors (shift detectors) 42R and 42L for detecting the pilot hydraulic pressure, and the fork shift switch 27 controls the pilot operation valve. When 28R and 28L are operated, the shift hydraulic sensors 42R and 42L detect the hydraulic pressures of the pilot hydraulic pipes 29R and 29L. The interlock controller 43 operates the cabin shift valve 34 based on the detection values of the shift hydraulic sensors 42R and 42L. The shift interlock switch 44 connected to the interlock controller 43 includes a synchronization interlock position for interlocking the cabin 14 and the fork 22 in the same direction with respect to the shift direction of the fork 22, a relative interlock position for switching in the reverse direction, and the cabin 14. Can be switched to an interlocking stop position where only the fork 22 is shifted.

  In the above configuration, the shift interlock switch 44 is set to the synchronization interlock position, and the fork shift switch 27 is operated to move, for example, the fork 22 to the right side. Then, by operating the fork shift switch 27, the hydraulic pressure of the pilot hydraulic pipes 29R, 29L is increased or decreased via the pilot operation valves 28R, 28L, and this is detected by the shift hydraulic sensors 42R, 42L. In the interlock controller 43, the cabin shift valve 34 is operated based on the detection values of the shift hydraulic sensors 42R and 42L, the cabin shift cylinder 33a is driven, and the cabin 14 is shifted in the same direction as the fork 22.

  Further, by setting the shift interlock switch 44 to the relative interlock position, the cabin shift cylinder 33a is driven in the reverse direction, and the cabin 14 is shifted in the reverse direction with respect to the fork 22. Of course, if the shift interlock switch 44 is set to the interlock stop position, the cabin 14 is not shifted.

  According to the first embodiment, when the front end of the fork is shifted corresponding to the load, the operator of the driver's seat 14a moves by moving the cabin 14 in the same direction or in the opposite direction corresponding to the shift of the fork 22. Thus, a good field of view can be easily secured at the front end of the fork 22 and the front of the fork 22. Therefore, unlike the conventional case, it is not necessary for the operator to adjust the field of view by moving the body or head, so that workability can be improved and fatigue can be reduced.

Further, the shift interlock switch 44 can be used to select the moving direction or stop of the cabin 14 with respect to the shift direction of the fork 22 in accordance with the situation at the work site, improving usability and improving work efficiency. .
[Example 2]
FIG. 6 shows a second embodiment in which the shift interlock mechanism 41 is different. Note that the same members as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The fork shift device 21 has the same configuration. The cabin shift device 31 takes out the drive hydraulic pressure to the cabin shift cylinder 33a by a hydraulic branch supply pipe 51 connected to the main hydraulic pipe 35 between the fork shift valve 30 and the fork shift cylinder 26 of the fork shift apparatus 21. .

  The shift interlock mechanism 50 includes a hydraulic pressure / oil amount adjustment valve 52 that eliminates the difference between the hydraulic pressure and the oil amount used in the fork shift cylinder 26 and the cabin shift cylinder 33a, and a shift interlock switch 44 via the interlock controller 43. A cabin shift switching valve 53 that switches between synchronous interlocking, relative interlocking, and interlocking stop is interposed in the hydraulic branch supply pipe 51. Limit switches (shift detectors) 54R and 54R for operating the cabin shift switching valve 53 are provided on the fork shift valve 30.

  Accordingly, when the fork shift switch 27 is operated by the fork shift device 21 to operate the fork shift valve 30 and the hydraulic pressure is supplied to one oil chamber of the fork shift cylinder 26, the fork 22 is connected to the fork 22 from the hydraulic branch supply pipe 51. Hydraulic pressure is supplied to the cabin shift cylinder 33a via the cabin shift switching valve 53 so as to move the cabin 14 in the same direction. Further, by operating the cabin shift switching valve 53, the cabin 14 can be moved in the direction opposite to the fork 22 or the movement of the cabin 14 can be stopped.

  According to the said Example 2, there can exist an effect similar to Example 1. FIG.

DESCRIPTION OF SYMBOLS 11 Vehicle main body 13 Lift apparatus 14 Cabin 14a Driver's seat 19 Carriage 21 Fork shift apparatus 22 Fork 26 Fork shift cylinder 27 Fork shift switch 28R, 28L Pilot operation valve 29R, 29L Pilot hydraulic pipe 30 Fork shift valve 30R, 30L Pilot valve 31 Cabin shift device 32 Cabin guide device 33 Cabin drive device 33a Cabin shift cylinder 34 Cabin shift valve 41 Shift interlock mechanism 42R, 42L Shift hydraulic sensor (shift detector)
43 Interlocking Controller 44 Shift Interlocking Switch 50 Shift Interlocking Mechanism 52 Hydraulic / Oil Level Adjustment Valve 53 Cabin Shift Switching Valves 54R, 54L Limit Switch (Shift Detector)

Claims (2)

A forklift comprising a fork shift device capable of side shifting a fork and a cabin in which a driver's seat is housed in a vehicle body,
In the vehicle body, a cabin is installed so as to be movable in the vehicle width direction, and a cabin shift device capable of moving the cabin in a predetermined range in the vehicle width direction is provided.
A forklift characterized in that a shift interlocking mechanism capable of operating the cabin shifter in conjunction with a forkshifter and moving the cabin in the same direction or in the opposite direction to the fork is provided. The shift interlock mechanism includes a shift detector that detects the operation of the fork shift device,
Based on the detection signal of the shift detector, an interlock controller that operates the drive device of the cabin shift device,
The forklift according to claim 1, further comprising: an operation switch that can be switched to a cabin interlock stop and an interlock in the same direction as the fork, or an interlock in a direction opposite to the fork of the cabin.

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