JP6076451B1 - Handling device for cargo handling vehicle - Google Patents

Abstract

An object of the present invention is to provide an operation device for a cargo handling vehicle that realizes two operations of a cargo handling tool by switching them with a single lever, thereby reducing erroneous operations. An operating device includes an operating lever provided so as to be swingable around a first shaft and around a second shaft. The operating device 3 is connected to first switching means for causing the cargo handling tool to perform a first operation, and operates by swinging the operating lever 32 around the first shaft 34 to switch the first switching mechanism 6. Prepare. The operating device 3 is connected to a second switching means for causing the cargo handling device to perform a second operation, and is operated by swinging the operating lever 32 around the first shaft 34 to switch the second switching mechanism 7. Prepare. The operation lever 32 is connected to the first link mechanism 6 but is not connected to the second link mechanism 7, and the second state is connected to the second link mechanism 7 but not connected to the first link mechanism 6. Can swing around the second shaft 36. [Selection] Figure 5

Description

  The present invention relates to an operation device for operating a cargo handling tool in a cargo handling device such as a forklift.

  Some cargo handling vehicles, for example, forklifts, include a vehicle main body provided with a driver's seat and a cargo handling device provided in front of the vehicle main body.

  The cargo handling device supplies hydraulic pressure to the mast provided upright in the up-and-down direction, the fork and other cargo handling equipment provided so as to be guided along the mast via the bracket, and the hydraulic cylinders for operating the cargo handling equipment. A hydraulic circuit or the like is provided. The cargo handling device is typically a pair of left and right forks, but in addition to this, attachments such as a pair of left and right clamp arms and a rotation clamp are also included.

  Furthermore, the forklift is provided with an operating device that is operated by an operator for the operation of the cargo handling device at the front portion of the driver's seat. The operating device includes a plurality of operating levers provided for each operation of the cargo handling tool. The operation lever is typically a lift lever or a tilt lever. Further, in a cargo handling vehicle that can handle attachments such as a clamp arm, the operation lever further includes a clamp lever and a shift lever. Thus, the forklift which provided the operation lever for every operation | movement of the cargo handling tool is disclosed by patent document 1 grade | etc.,.

  When the operator operates the clamp lever, the clamp valve in the hydraulic circuit is switched, and the pair of clamp arms move horizontally in opposite directions. Thereby, the pair of clamp arms grips or releases the load. When the operator operates the shift lever, the shift valve in the hydraulic circuit is switched, and the pair of clamp arms move horizontally in the same direction. Accordingly, the pair of clamp arms horizontally moves the gripped load.

JP 2007-62989 A

  The operation lever is arranged side by side at the front of the driver's seat. Therefore, the operator sometimes causes the cargo handling tool to malfunction. Specifically, when the cargo handling tool is a pair of clamp arms, for example, the shift lever is intended to move the load held by the pair of clamp arms to the left side, but the clamp lever next to it is moved. Alternatively, both the shift lever and the clamp lever may be moved. As a result of erroneously operating the clamp lever, the pair of clamp arms may open and drop the load being held.

  Therefore, the present invention is to provide an operation device for a cargo handling vehicle that realizes two operations of the cargo handling equipment by switching them with one lever, thereby reducing erroneous operations.

In order to solve the above problems, the present invention is an operating device for a cargo handling vehicle operated for the operation of a cargo handling tool,
A first shaft;
A first swinging member provided swingably around the first shaft;
A second shaft provided so as to be able to swing around the first shaft together with the first swinging member and extending at a right angle to the first shaft;
An operation lever provided so as to be swingable around the first shaft and swingable around the second shaft;
A second rocking member provided on a proximal end side of the operation lever and rocking around the second shaft together with the operation lever;
Is connected to a first switching means for first operating said loading tool, a first link mechanism for switching the first switching means is actuated by the swinging around said first shaft of said operating lever,
The loading tool is connected to the second switching means to the second operation, and a second link mechanism for switching the second switching means is activated by swinging around the first shaft of the operating lever ,
The operating lever has a first state, but is actuatable the first link mechanism inoperative the connected without the second link mechanism to said second link mechanism being connected to said first link mechanism, said first A second state in which the second link mechanism is operable by being connected to a two-link mechanism, but is not connected to the first link mechanism and incapable of operating the first link mechanism. swingably der to is,
The second oscillating member is provided on a first convex portion provided on one side of the oscillating direction around the second shaft and on the other side of the oscillating direction around the second shaft. A second convex portion,
The first link mechanism includes a first receiving member that is swingably provided around the first shaft and that receives the first convex portion.
The second link mechanism includes a second receiving member provided so as to be swingable around the first shaft, and receiving the second convex portion.
When the first convex portion is received by the first receiving member, the operation lever is connected to the first link mechanism via the second swinging member, and the second convex portion is the second receiving member. The operating lever is connected to the second link mechanism via the second swing member.
It is characterized by that.

Preferably, the cargo handling tool is a pair of clamp arms,
The first operation is a clamp operation that horizontally moves the pair of clamp arms in opposite directions,
The second operation is a shift operation that horizontally moves the pair of clamp arms in the same direction.

  ADVANTAGE OF THE INVENTION According to this invention, the operation | movement apparatus of the cargo handling vehicle which switches and implement | achieves two operation | movement of a cargo handling tool with one lever, and reduces an erroneous operation can be provided.

It is a schematic side view of a forklift provided with the operating device concerning the present invention. It is a perspective view which shows the upper part of an operating device roughly. It is a perspective view which shows the whole structure of an operating device. FIG. 4A is a perspective view partially showing a switching structure of an operation lever, and FIG. 4B is a side view thereof. It is a perspective view which shows the switching structure of an operation lever, and is a figure which has an operation lever in an intermediate state. It is a perspective view which shows the switching structure of an operation lever, and is a figure which has an operation lever in a 1st state. It is a perspective view which shows the switching structure of an operation lever, and is a figure which has an operation lever in a 2nd state. It is a perspective view which shows a control plate.

  Hereinafter, an operation device for a cargo handling vehicle according to the present invention will be described with reference to the drawings. This embodiment demonstrates the case where a cargo handling vehicle is a forklift. Further, the forklift exemplified below is a counter balance type, but may be another type.

  With reference to FIG. 1, the forklift includes a vehicle main body 1 and a cargo handling device 2 provided in front of the vehicle main body 1. The front part of the vehicle body 1 is a driver's seat 10 on which an operator boardes.

  The cargo handling device 2 includes a mast 20 provided upright in the ascending / descending direction (vertical direction), a bracket 21 guided in the ascending / descending direction along the mast 20, and a pair of left and right clamps as a cargo handling tool supported by the bracket 21. Arm 22 (the other clamp arm is not shown). The pair of clamp arms 22 extends forward from the bracket 21 and is provided at intervals in the left-right direction. The cargo handling tool is typically a pair of left and right forks, but in this embodiment, a clamp arm 22 is provided as an attachment in place of the fork.

  Although not shown, the cargo handling device 2 includes a plurality of hydraulic cylinders for operating the pair of clamp arms 22 and a hydraulic circuit for supplying hydraulic oil to each hydraulic cylinder.

  The hydraulic cylinder includes a lift cylinder for raising and lowering the pair of clamp arms 22 along the mast 20, and a tilt cylinder for tilting the pair of clamp arms 22 together with the mast 20 in the front-rear direction Y. The hydraulic cylinder includes a clamping cylinder for moving the pair of clamp arms 22 horizontally (left and right) in opposite directions and a shift cylinder for moving the pair of clamp arms 22 to the same horizontal (left and right). Including.

  The hydraulic circuit includes a lift circuit for supplying and discharging hydraulic oil to and from the lift cylinder, a tilt circuit for supplying and discharging hydraulic oil to the tilt cylinder, and a hydraulic oil to the clamp cylinder. A clamp circuit for discharging and a shift circuit for supplying and discharging hydraulic oil to and from the shift cylinder are included.

  FIG. 2 is a perspective view partially showing the front part of the driver's seat 10. In the front part of the driver's seat 10 of the forklift, an operating device 3 that is operated by an operator who has boarded the driver's seat 10 is provided in order to operate the clamp arm 22.

  The operating device 3 includes a lift operation lever 30 for lifting the clamp arm 22, a tilt operation lever 31 for tilting the clamp arm 22, and a clamp / shift operation for clamping and shifting the clamp arm 22. Lever 32. These 30, 31, 32 are arranged side by side in the left-right direction X.

  FIG. 3 is an overall perspective view of the operating device 3, in which the illustration of the frame of the vehicle body 1 is omitted. The operating device 3 includes a pair of support members 33 (FIG. 3) arranged at intervals in the left-right direction X, and a first shaft 34 that is supported by the pair of support members 33 and extends in the left-right direction X. ing. The operating device 3 includes a lift link mechanism 4 and a tilt link mechanism 5.

  The lift link mechanism 4 is provided on the outer periphery of the cylinder member 40 that is fitted around the first shaft 34 so as to be swingable around the first shaft 34, and is provided on the base end side of the lift operation lever 30. And a link 42 having one end connected to the connection member 41 and the other end connected to the lift valve 23 in the lift circuit. When the lift operating lever 30 is swung in the longitudinal direction Y around the first shaft 34 together with the tubular member 40 and the connecting member 41, the link 42 moves forward and backward in the longitudinal direction, and the lift valve 23 is switched. Thereby, the lift circuit is opened, the lift cylinder is operated, and the pair of clamp arms 22 are lifted.

  Similarly, the tilt link mechanism 5 is provided on the outer periphery of the tubular member 50 that is fitted around the first shaft 34 so as to be swingable around the first shaft 34, and the tilt operating lever 31. And a link 52 having one end connected to the connection member 51 and the other end connected to the tilt valve 24 in the tilt circuit. When the tilt operation lever 31 is swung in the front-rear direction Y around the first shaft 34 together with the cylindrical member 50 and the connection member 51, the link 52 moves forward and backward, and the tilt valve 24 is switched. Accordingly, the tilt circuit is opened, the tilt cylinder is operated, and the pair of clamp arms 22 are tilted together with the mast 20.

  An operation lever 32 for clamping and shifting (hereinafter simply referred to as an operation lever) is a switching type operation lever, and a clamp operation and a shift operation are selectively realized by the one operation lever 32. Hereinafter, this configuration will be described.

  Referring to FIG. 3, a clamping valve 25 (an example of a first switching unit) for clamping the pair of clamp arms 22 is provided in the clamping circuit. In the shift circuit, there is provided a shift valve 26 (an example of second switching means) for shifting the pair of clamp arms 22.

  The operating device 3 includes a clamp link mechanism 6 (an example of a first link mechanism) connected to the clamp valve 25 for switching the clamp valve 25, and a shift valve 26 connected to the shift valve 26. And a shift link mechanism 7 (an example of a second link mechanism).

  4A and 4B show a switching structure for switching the clamp / shift operation lever 32 (hereinafter simply referred to as an operation lever) between a clamp operation position and a shift operation position. The link mechanism 7 is not shown.

  Referring to FIG. 4, the operating device 3 swings around the first shaft 34 together with the first swinging member 35 swingably provided around the first shaft 34 and the first swinging member 35. And a second shaft 36 that can be provided. The first swing member 35 is externally fitted to the first shaft 34. The second shaft 36 is inserted into the first swing member 35 and extends in the front-rear direction Y, that is, at a right angle to the first shaft 34.

  The operating device 3 includes a second swinging member 37 that is provided on the proximal end side of the operating lever 32 and that is swingable around the second shaft 36. The second oscillating member 37 includes a horizontal portion extending in the front-rear direction Y and a vertical portion extending downward from the rear end of the horizontal portion, and has a substantially L shape in side view. The second swing member 37 can swing around the second shaft 36 by inserting the second shaft 36 into the vertical portion thereof. The base end of the operation lever 32 is connected to the horizontal portion of the second swing member 37.

  With this configuration, the operation lever 32 can swing in the front-rear direction Y around the first shaft 34 together with the first swing member 35, the second shaft 36, and the second swing member 37. The operation lever 32 can further swing in the left-right direction X around the second shaft 36 together with the second swing member 37.

  The clamp link mechanism 6 and the shift link mechanism 7 are operated by swinging around the first shaft 34 of the operation lever 32 (swing in the front-rear direction Y), and the clamp valve 25 and the shift valve 26 are respectively moved. It is to switch.

  FIG. 5 shows a perspective view of the switching structure of the operation lever 32. The clamp link mechanism 6 includes a first cylinder member 60 fitted to the first shaft 34 so as to be swingable around the first shaft 34 on the left side of the second swing member 37, and an outer periphery of the first cylinder member 60. The first receiving member 61 is provided. The shift link mechanism 7 includes a second cylinder member 70 fitted on the first shaft 34 so as to be swingable around the first shaft 34 on the right side of the second swing member 37, and an outer periphery of the second cylinder member 70. And a second receiving member 71 provided on the head. The first receiving member 61 is formed with a first notch 610, and the second receiving member 71 is formed with a second notch 710.

  Further, the clamping link mechanism 6 includes a first link 62. One end of the first link 62 is connected to the first receiving member 61 as shown in FIG. 4B, and the other end is connected to the clamping valve 25 as shown in FIG. Similarly, the shift link mechanism 7 includes a second link 72 having one end connected to the second receiving member 71 and the other end connected to the shift valve 26.

  The horizontal portion of the second swing member 37 has a first convex portion 370 projecting leftward on one side (left side) of the swing direction around the second shaft 36, and around the second shaft 36. A second convex portion 371 that protrudes in the right direction is formed on the other side (right side) of the rocking direction.

  In FIG. 5, when the operation lever 32 is swung to the left around the second shaft 36, the first convex portion 370 of the second rocking member 37 is the first of the clamp link mechanism 6 as shown in FIG. 6. While being received by the first notch 610 of the receiving member 61, the second convex portion 371 is not received by the second notch 710 of the second receiving member 71. That is, the operation lever 32 is connected to the clamp link mechanism 6 via the second swing member 37 but is not connected to the shift link mechanism 7.

In this state, when the operating lever 32 is swung around the first shaft 34 in either the front-rear direction Y, the first cylinder member 60 and the first receiving member 61 are swung around the first shaft 34 together with this. The first link 62 moves forward and backward along its longitudinal direction. As a result, the clamp valve 25 is switched, the clamp circuit is opened, the clamp cylinder is operated, and the pair of clamp arms 22 are clamped. That is, the clamp link mechanism 6 is operated, and the pair of clamp arms 22 are clamped. At this time, the shift link mechanism 7 does not operate because it is not connected to the operation lever 32.
Hereinafter, this state is referred to as a first state.

  On the other hand, in FIG. 5, when the operation lever 32 is swung rightward around the second shaft 36, the second convex portion 371 of the second rocking member 37 is While being received by the second notch 710 of the second receiving member 71, the first convex portion 370 is not received by the first notch 610 of the first receiving member 61. That is, the operation lever 32 is connected to the shift link mechanism 7 via the second swing member 37 but is not connected to the clamp link mechanism 6.

In this state, when the operation lever 32 is swung around the first shaft 34 in either the front-rear direction Y, the second cylindrical member 70 and the second receiving member 71 are swung around the first shaft 34 together with this. The second link 72 moves forward and backward along its longitudinal direction. As a result, the shift valve 26 is switched, the shift circuit is opened, the shift cylinder is activated, and the pair of clamp arms 22 are shifted. That is, the shift link mechanism 7 is operated to shift the pair of clamp arms 22. At this time, the clamping link mechanism 6 is not connected to the operation lever 32 and thus does not operate.
Hereinafter, this state is referred to as a second state.

  Thus, the operation lever 32 is connected to the clamp link mechanism 6 and can operate the clamp link mechanism 6, but is not connected to the shift link mechanism 7 and cannot operate the shift link mechanism 7. (FIG. 6) and a second state in which the shift link mechanism 7 can be operated by being connected to the shift link mechanism 7 but is not connected to the clamp link mechanism 6 and the clamp link mechanism 6 cannot be operated (FIG. 7). ) And can be swung around the second shaft 36.

  That is, the operation lever 32 is swung in the left-right direction X around the second shaft 36 to switch between the clamp operation and the shift operation, and the clamp operation and the shift operation can be realized with only one operation lever 32. Is done. Therefore, as described in the prior art, the intention to move the shift lever to move the load grasped by the pair of clamp arms 22 to the left side will move the clamp lever next to it, or the shift lever and the clamp lever An erroneous operation that can occur when two movements are realized with two levers, both of which are moved, is prevented.

  In this embodiment, since the distance in the left-right direction X between the first receiving member 61 and the second receiving member 71 is narrow, the operation lever 32 is moved between the first state and the second state as shown in FIG. The first convex portion 370 is received by the first receiving member 61, and the second convex portion 371 is received by the second receiving member 71. That is, the operation lever 32 is connected to both link mechanisms 6 and 7 when in the intermediate state (hereinafter, the state of FIG. 5 is referred to as an intermediate state). Therefore, when the operation lever 32 in the intermediate state is swung around the first shaft 34 in the front-rear direction Y, both link mechanisms 6 and 7 are operated. As a result, the pair of clamp arms 22 are clamped and shifted. To do. However, such simultaneous operation is usually unnecessary.

Therefore, as shown in FIG. 2, the operating device 3 includes a regulating plate 8 that regulates the swing range of the operating lever 32 in order to prevent simultaneous operation. The restriction plate 8 is formed with an H-shaped guide hole 80 in plan view. The operation lever 32 is inserted into the guide hole 80 and can swing only within the range of the guide hole 80.

With reference to FIG. 8, the guide hole 80 of the control plate 8 will be described in detail.
The guide hole 80 includes a first hole portion 81, a second hole portion 82, and a central hole portion 83. The first hole portion 81 and the second hole portion 82 extend in the front-rear direction Y, and are formed at an interval in the left-right direction X. The central hole 83 extends in the left-right direction X between the center of the first hole 81 and the center of the second hole 82.

  The operation lever 32 in the intermediate state in FIG. 5 is located in the central hole 83 of the guide hole 80. At this time, the front edge 830 and the rear edge 831 that define the central hole portion 83 function as a stopper, and restrict the swing in the front-rear direction Y around the first shaft 34 of the operation lever 32 in the intermediate state. That is, the swing of the operation lever 32 in the front-rear direction Y in a state where it is connected to both the link mechanisms 6 and 7 is restricted, and as a result, simultaneous operation of the clamping operation and the shifting operation is prevented.

  The operating lever 32 moves from the center hole 83 to the center of the first hole 81 when swinging leftward from the intermediate state in FIG. 5 to the first state in FIG. 6. Since the operation lever 32 is guided in the front-rear direction Y along the first hole 81, the swing of the operation lever 32 in the front-rear direction Y in the first state is ensured. That is, the clamping operation is ensured.

  Similarly, the operation lever 32 moves from the center hole 83 to the center of the second hole 82 when swinging rightward from the intermediate state of FIG. 5 to the second state of FIG. Since the operation lever 32 is guided in the front-rear direction Y along the second hole 82, the swing of the operation lever 32 in the front-rear direction Y in the second state is ensured. That is, the shift operation is guaranteed.

  As described above, the regulation plate 8 can only swing in the front-rear direction Y in the first state and the second state, and swing in the left-right direction X through an intermediate state between the first state and the second state. Thus, the swinging in the front-rear direction Y in the intermediate state is restricted. Thereby, simultaneous operation of the clamp operation and the shift operation is prevented, and only one of the clamp operation and the shift operation is realized.

  As shown in FIG. 2, the operating device 3 includes a spring 9. The spring 9 is attached to the operation lever 32 and the lower side plate 91 on the right side of the restriction plate 8 to urge the operation lever 32 in the right direction, that is, in the second state in FIG. The spring 9 may be attached to the operation lever 32 and the lower side plate 90 on the left side of the restriction plate 8 to bias the operation lever 32 to the first state in FIG.

  By urging the operating lever 32 to either the first state or the second state by the spring 9, when the operator releases the hand from the operating lever 32 in the intermediate state, the first state (switched to the clamping operation) State) or the second state (the state switched to the shift operation). That is, the operation lever 32 is prevented from being held in the halfway state of the intermediate state in FIG.

  Although not shown, a switch is provided on the distal end side of the operation lever 32, and the hydraulic motor in the hydraulic circuit is operated only when the operation lever 32 is swung in the front-rear direction Y while pressing this switch. Also good. That is, the clamp arm 22 may be configured to perform the clamp operation / shift operation only when the operation lever 32 is swung in the front-rear direction X while pressing the switch. As a result, malfunctions can be more reliably prevented and even safer.

  As shown in FIG. 3, in this embodiment, the switching structure of the operation lever 32 for the clamp arm 22 as an attachment is used in the lift link mechanism 4 and the tilt link mechanism 5 provided in advance in the forklift. This is realized by using one shaft 34. That is, the switching structure of the operation lever 32 can be easily installed adjacent to the lift link mechanism 4 and the tilt link mechanism 5 using the first shaft 34 already provided in the forklift.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to said embodiment.
The switchable operation lever 32 is realized by switching between a clamp operation and a shift operation, but is not limited to this. That is, any operation realized by the operation lever 32 may be performed. For example, the switchable operation lever 32 may be realized by switching between a lift operation and a tilt operation.

1 vehicle body 2 cargo handling device 22 clamp arm
25 Clamping valve (example of first switching means)
26 Shift valve (an example of second switching means)
3 Operating Device 32 Clamp / Shift Operation Lever 34 First Shaft 35 First Oscillating Member 36 Second Shaft 37 Second Oscillating Member 370 First Convex 371 Second Convex 6 Clamping Link Mechanism (First Link Mechanism Example)
60 1st cylinder member 61 1st receiving member 7 Link mechanism for shift (an example of 2nd link mechanism)
70 Second cylinder member 71 Second receiving member 8 Restriction plate 80 Guide hole 9 Spring

Claims (2)

An operating device for a cargo handling vehicle operated for the operation of a cargo handling equipment,
A first shaft;
A first swinging member provided swingably around the first shaft;
A second shaft provided so as to be able to swing around the first shaft together with the first swinging member and extending at a right angle to the first shaft;
An operation lever provided so as to be swingable around the first shaft and swingable around the second shaft;
A second rocking member provided on a proximal end side of the operation lever and rocking around the second shaft together with the operation lever;
Is connected to a first switching means for first operating said loading tool, a first link mechanism for switching the first switching means is actuated by the swinging around said first shaft of said operating lever,
The loading tool is connected to the second switching means to the second operation, and a second link mechanism for switching the second switching means is activated by swinging around the first shaft of the operating lever ,
The operating lever has a first state, but is actuatable the first link mechanism inoperative the connected without the second link mechanism to said second link mechanism being connected to said first link mechanism, said first A second state in which the second link mechanism is operable by being connected to a two-link mechanism, but is not connected to the first link mechanism and incapable of operating the first link mechanism. swingably der to is,
The second oscillating member is provided on a first convex portion provided on one side of the oscillating direction around the second shaft and on the other side of the oscillating direction around the second shaft. A second convex portion,
The first link mechanism includes a first receiving member that is swingably provided around the first shaft and that receives the first convex portion.
The second link mechanism includes a second receiving member provided so as to be swingable around the first shaft, and receiving the second convex portion.
When the first convex portion is received by the first receiving member, the operation lever is connected to the first link mechanism via the second swinging member, and the second convex portion is the second receiving member. The operating lever is connected to the second link mechanism via the second swing member.
A cargo handling vehicle operating device. The cargo handling tool is a pair of clamp arms,
The first operation is a clamp operation that horizontally moves the pair of clamp arms in opposite directions,
The second operation is a shift operation that horizontally moves the pair of clamp arms in the same direction.
The operating device for a cargo handling vehicle according to claim 1 .

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