JP2010168204A - Cargo handling lever fixing device of industrial vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cargo handling lever fixing device of an industrial vehicle capable of enhancing the safety of a cargo handling lever. <P>SOLUTION: In a forklift 1, a cargo handling lever fixing device is constituted to fix a cargo handling lever 8 to the neutral position. A joint bar 86 is connected to a lower end of the cargo handling lever 8, and a lower end of the joint bar 86 is connected to a spool 88 of a hydraulic control valve 87 for controlling the drive of a working device 5. A solenoid 100 having a plunger (a locking unit) 102 having a locking projection 103 is provided on the side of the joint bar 8. A circumferential groove (a locked part) 86a capable of detachably locking the locking projection 103 is formed in the joint bar 86. The plunger 102 is projected to the side of the joint bar 86 when a seat switch of a driver's seat is turned off at the neutral position of the cargo handling lever 8, and the locking projection 103 is locked to the circumferential groove 86a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an industrial vehicle, and more particularly to an improved structure for improving the safety of a cargo handling lever.

  In general, an industrial vehicle such as a forklift has a working device (loading device) such as a fork at the front portion of the vehicle in order to perform work such as unloading. The driver's seat is provided with a cargo handling lever for the operator to operate the working device (see paragraph [0002] of Japanese Patent Laid-Open No. 2008-59303). The lower end of the cargo handling lever is connected to a hydraulic control valve (see paragraphs [0021] to [0022] of the publication).

  When the operator moves the cargo handling lever, the hydraulic control valve is driven, the hydraulic equipment is controlled by the flow rate from the hydraulic pump, and the working device such as a fork is driven.

  The handling lever is usually operated while the operator is seated in the driver's seat.However, in conventional industrial vehicles, when the operator leaves the driver's seat, the operator's body touches the cargo handling lever to handle the cargo. There was a risk that the lever could be operated by mistake. Moreover, in the conventional industrial vehicle, since it was possible for the operator to operate the cargo handling lever in a state of getting off the industrial vehicle, there was a safety problem.

  The present invention has been made in view of such conventional circumstances, and an object of the present invention is to provide a cargo handling lever fixing device for an industrial vehicle that can improve the safety of the cargo handling lever. .

  The invention of claim 1 is a cargo handling lever fixing device for fixing a cargo handling lever for operating a cargo handling device in an industrial vehicle to a neutral position, wherein the joint bar is connected to the lower end of the cargo handling lever and the lower end of the joint bar. Is connected to the spool of a hydraulic control valve for driving control of the cargo handling device, and a locking portion provided on the side of the joint bar so as to be able to approach and leave the joint bar is provided on the joint bar. Is provided with a locked portion in which the tip of the locking portion can be detachably locked. And in the neutral position of a cargo handling lever, the front-end | tip of a latching | locking part can be latched to the to-be-latched part of a joint bar.

  In the first aspect of the invention, when the cargo handling lever is operated, the joint bar moves in conjunction with the cargo handling lever, whereby the spool connected to the lower end of the joint bar moves, so that the hydraulic control valve is driven and controlled. The cargo handling device is operated.

  Next, when the cargo handling lever is arranged at the neutral position, the tip of the locking portion engages with the locked portion of the joint bar. Thereby, a cargo handling lever can be fixed to a neutral position. As a result, it is possible to prevent the cargo handling lever from being inadvertently operated from the neutral position to drive the cargo handling device, and thus the safety of the cargo handling lever can be improved.

  According to a second aspect of the present invention, in the first aspect, the driver seat of the industrial vehicle includes a seat switch that is turned on when the operator is seated on the driver seat and turned off when the operator leaves the driver seat. When the seat switch is turned off, the front end of the locking portion is locked to the locked portion of the joint bar at the neutral position of the cargo handling lever.

  In this case, whether or not the operator is seated in the driver's seat is detected by the seat switch, and when the operator leaves the driver's seat, the seat switch is turned off. When the seat switch is turned off, when the cargo handling lever is disposed at the neutral position, the tip of the locking portion is locked to the locked portion of the joint bar. Thereby, when an operator leaves | separates from a driver's seat, a cargo handling lever can be fixed to a neutral position. As a result, the operator can no longer operate the cargo handling lever while away from the driver's seat, so the safety of the cargo handling lever can be improved.

  According to a third aspect of the present invention, in the second aspect of the present invention, the locking portion is configured by a retractable plunger provided in the solenoid, and when the seat switch is turned off, the current supply to the coil of the solenoid is stopped. The plunger protrudes toward the joint bar.

  In this case, when the operator leaves the driver's seat and the seat switch is turned off, the supply of current to the solenoid coil is stopped, so that the plunger protrudes toward the joint bar, and the tip of the locking portion is Lock to the locked portion of the joint bar at the neutral position of the cargo handling lever. Thereby, the cargo handling lever is fixed at the neutral position.

  According to a fourth aspect of the present invention, in the third aspect, the plunger passes through the solenoid housing in the axial direction, and an operator moves the tip of the plunger from the locked portion of the joint bar to the rear end of the plunger. An operation unit for forcibly disengaging is provided.

  In this case, the operator can easily disengage the distal end of the plunger from the locked portion of the joint bar by operating the operation portion at the rear end of the plunger. As a result, when the solenoid coil is damaged or the electric circuit is disconnected, the locked state between the plunger tip and the joint bar can be forcibly released.

  According to a fifth aspect of the present invention, in the first or second aspect, the locked portion is a groove, hole, or notch formed on the outer periphery of the joint bar.

  According to the invention of claim 6, in claim 1, a plurality of cargo handling levers are provided, a plurality of joint bars are provided corresponding to each cargo handling lever, and a locking portion is provided for each engaged bar of each joint bar. It is comprised from the some latching | locking part each latched to a stop part.

  In this case, when each cargo handling lever is disposed at the neutral position, the tip of each locking portion engages with each locked portion of each joint bar. Thereby, a plurality of cargo handling levers can be fixed at the neutral position at a time, and as a result, it is possible to prevent each cargo handling lever from being inadvertently operated from the neutral position and driving the cargo handling device. In this way, the safety of each cargo handling lever can be improved.

  As described above, according to the present invention, the locking portion that can be moved toward and away from the joint bar connected to the lower end of the cargo handling lever is provided, and the tip of the locking portion is disposed when the cargo handling lever is disposed at the neutral position. Since the locked part that can be locked is provided on the joint bar, the cargo handling lever is brought to the neutral position by locking the tip of the locking part to the locked part of the joint bar at the neutral position of the cargo handling lever. Thus, the handling lever can be prevented from being inadvertently operated from the neutral position to drive the handling device, and the safety of the handling lever can be improved.

1 is a schematic side view of a forklift in which a cargo handling lever fixing device according to the present invention is employed. It is a schematic block diagram in the latching state of the cargo handling lever fixing device by one Example of this invention. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is a partially expanded view in the locked state of the said cargo handling lever fixing device (FIG. 2). FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is a partially expanded view in the locked state of the cargo handling lever fixing device according to another embodiment of the present invention. It is the VIII-VIII sectional view taken on the line of FIG. It is a partially expanded view in the locked state of the cargo handling lever fixing device (FIG. 8). It is the XX sectional view taken on the line of FIG. It is an enlarged view of the latching | locking part of the cargo handling lever fixing device by further another Example of this invention. It is an enlarged view of the latching | locking part of the cargo handling lever fixing device by another Example of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, a forklift 1 according to the present invention includes a pair of left and right vehicle body frames 2 extending in the front-rear direction (the left-right direction in the figure), drive wheels 3 and steering wheels 4 disposed in the front-rear direction, and a body frame 2. A working device (loading device) 5 having a fork claw 5a provided at the front end of the vehicle, a driver seat 6 on which an operator sits, and a steering device 7 provided in front of the vehicle body frame 2 in front of the driver seat 6; A cargo handling lever 8 for operating the work device 5 is provided. Here, a forklift will be described as an example of an industrial vehicle, but the present invention can be similarly applied to other industrial vehicles other than a forklift.

  Above the driver's seat 6, a head guard 9 for guarding the overhead of the operator sitting in the driver's seat 6 is provided. The head guard 9 is supported by the front pillar 10 on the front end side and the rear pillar 11 on the rear end side. A counterweight portion 12 is provided at the rear portion of the vehicle body frame 2.

  As shown in FIG. 2, a collar 80 is fixed to the lower end of the cargo handling lever 8, and the collar 80 is rotatably supported by a pin 81 that passes through the collar 80. Both ends of the pin 81 are fixed to a pair of brackets 82 that are spaced apart in the direction perpendicular to the paper surface of FIG. Each bracket 82 is attached to the front guard 83. One end of a lever 84 is fixed to the collar 80, and the other end of the lever 84 is connected to the upper end of the joint bar 86 via a pin 85 so as to be rotatable. The joint bar 86 extends substantially in the vertical direction. With this configuration, when the cargo handling lever 8 is operated substantially in the front-rear direction, the joint bar 86 moves up and down via the collar 80, the lever 84, and the pin 85.

  A hydraulic control valve 87 is provided below the joint bar 86. The hydraulic control valve 87 is attached to a front plate 83 a suspended from the lower end of the front guard 83. A spool 88 extending in the vertical direction is provided in the hydraulic control valve 87 so as to be slidable in the vertical direction. The lower end of the joint bar 86 is connected to the upper end of the spool 88 via a pin 89. When the joint bar 86 is driven, a hydraulic circuit is constructed between the spool 88 and the oil passage inside the valve in accordance with the vertical position of the spool 88, so that the hydraulic device for driving the work device 5 (see FIG. (Not shown) is driven and controlled.

  A circumferential groove (locked portion) 86 a is formed on the outer periphery of the intermediate portion in the longitudinal direction of the joint bar 86. On the other hand, a solenoid 100 is provided on the side of the intermediate portion in the longitudinal direction of the joint bar 86. The solenoid 100 is provided so as to be slidable inside the housing 101 through the housing 101 and can be moved in and out of the housing 101 (that is, can move toward and away from the joint bar 86). And a plunger (locking portion) 102. The distal end of the plunger 102 is provided so as to be releasably engageable with the circumferential groove 86 a of the joint bar 86. The casing 101 is attached to the bracket 150. A coil (not shown) is built in the housing 101. The circumferential groove 86a of the joint bar 86 and the plunger 102 of the solenoid 100 constitute a cargo handling lever fixing device according to an embodiment of the present invention.

  In order to smoothly engage and disengage the distal end of the plunger 102 and the circumferential groove 86a of the joint bar 86, either or both of the distal end of the plunger 102 and the circumferential groove 86a are provided with a friction reducing lubricant (oil or grease). Etc.) may be applied. Alternatively, either or both of the distal end of the plunger 102 and the circumferential groove 86a may be composed of a member having a small friction coefficient. Further, a friction reducing lubricant (oil or grease or the like) may be applied to the surface of the joint bar 86, or the joint bar 86 itself may be made of a member having a small friction coefficient.

  As shown in FIG. 3, a current supply circuit 200 is connected to the coil of the solenoid 100. The current supply circuit 200 includes a power source 201 and a seat switch 202 (not shown in FIG. 1) provided below the driver's seat 6 (FIG. 1). The seat switch 202 is a switch that is turned on when the operator is seated on the driver's seat 6 and turned off when the operator leaves the driver's seat.

  As shown in FIG. 4, a substantially U-shaped locking projection 103 is provided at the tip of the plunger 102. The engaging recess 103 a formed in the locking protrusion 103 has a size that can be detachably locked to the small diameter portion 86 b formed in the circumferential groove 86 a portion of the joint bar 86. In addition, for example, a semi-disc shaped knob (operation unit) 104 that can be gripped by the operator is provided at the rear end of the plunger 102. Further, a spring 105 that urges the plunger 102 in a direction in which the plunger 102 protrudes from the housing 101 is disposed on the outer periphery of the plunger 102 outside the housing 101 (see FIG. 3).

Next, the function and effect of this embodiment will be described.
First, when the operator is seated on the driver's seat 6, the seat switch 202 is turned on and the current supply circuit 200 is closed (see FIG. 3). Then, a current from the power source 201 is supplied to the coil inside the solenoid 100 to excite the coil, and the plunger 102 moves to the right in FIG. 3 against the elastic repulsive force of the spring 105 (that is, moves away from the joint bar 86). To the side). Thereby, the latching state of the latching protrusion 103 at the tip of the plunger 102 and the circumferential groove 86a of the joint bar 86 is released (see FIGS. 3 and 4).

  From this state, when the operator operates the cargo handling lever 8 in the front-rear direction, the joint bar 86 moves up and down via the lever 84, whereby the spool 88 moves in the hydraulic control valve 87, thereby A device (not shown) is driven and controlled, and the work device 5 is operated.

  Next, when the operator arranges the cargo handling lever 8 at the neutral position, the circumferential groove 86a of the joint bar 86 is arranged at a position facing the locking projection 103 at the tip of the plunger 102 (see FIG. 2). When the operator leaves the driver's seat 6 in this state, the seat switch 202 is turned off, the current supply circuit 200 is opened (see FIG. 5), and the current supply to the coils inside the solenoid 100 is stopped. As a result, the plunger 102 moves to the left in FIG. 3 by the elastic repulsive force of the spring 105 (that is, protrudes toward the joint bar 86). Thereby, the locking protrusion 103 at the tip of the plunger 102 is locked in the circumferential groove 86a of the joint bar 86 (see FIGS. 5 and 6).

  In this way, the cargo handling lever 8 can be fixed at the neutral position by restraining the joint bar 86 in the vertical direction. As a result, the handling lever 5 can be prevented from being inadvertently operated from the neutral position to drive the work device 5, and the safety of the handling lever 8 can be improved.

  When the solenoid 100 coil is damaged or the current supply circuit 200 is disconnected, it is necessary to forcibly release the locking state between the locking protrusion 103 at the tip of the plunger 102 and the circumferential groove 86a of the joint bar 86. In such a case, the operator can easily disengage the locking protrusion 103 at the tip of the plunger 102 from the circumferential groove 86 a of the joint bar 86 by operating the operator to grip the knob 104 at the rear end of the plunger 102 and pull the plunger 102. It is possible to make it.

  In the above embodiment, a substantially U-shaped plate is used as the locking protrusion at the tip of the plunger 102, and the circumferential groove 86a is used as the locked portion of the joint bar 86. It is not limited to this.

  7 to 10 show a cargo handling lever fixing device according to another embodiment of the present invention. In these drawings, the same reference numerals as those in the previous embodiment denote the same or corresponding parts.

  In the embodiment shown in FIGS. 7 to 10, the shape of the locking protrusion at the tip of the plunger 102 and the shape of the locked portion of the joint bar 86 are different from those in the above-described embodiment. That is, the locking protrusion 106 at the tip of the plunger 102 is a thin columnar member. The locked portion of the joint bar 86 is a small-diameter hole 86 c formed on the outer peripheral surface of the joint bar 86.

  In this case, when the seat switch 202 is turned off, the locking protrusion 106 at the tip of the plunger 102 is locked in the hole 86c of the joint bar 86, whereby the cargo handling lever 8 can be fixed at the neutral position.

  Further, other shapes may be adopted as the shapes of the locking protrusion at the tip of the plunger 102 and the locked portion of the joint bar 86. For example, the locking projections may be configured from a substantially triangular or semicircular plate, and the locked portion may be configured from a substantially triangular or semicircular cutout.

  In each of the above-described embodiments, an example in which the locking protrusion at the tip of the plunger 102 is configured by a single member has been shown, but the application of the present invention is not limited to this. 11 shows a modification of FIG. 4, and FIG. 12 shows a modification of FIG. In the example of FIGS. 11 and 12, a plurality (three here) of cargo handling levers 8 are provided, and a plurality (three here) of joint bars 86 are provided corresponding to each of the cargo handling levers 8. It corresponds to. In these drawings, the same reference numerals as those in the above-described embodiments indicate the same or corresponding parts.

As shown in FIG. 11, a protruding portion 110 extending in a direction orthogonal to the axial direction of the plunger 102 is provided at the tip of the plunger 102, and the protruding portion 110 includes a plurality (three in this case). Engagement recesses 103a ₁ , 103a ₂ , 103a ₃ are formed. Although not shown, circumferential grooves that can be engaged with the respective engaging recesses 103a ₁ , 103a ₂ , 103a ₃ of the plunger 102 are formed on the outer periphery of each joint bar 86.

As shown in FIG. 12, a protruding portion 110 ′ extending in a direction orthogonal to the axial direction of the plunger 102 is provided at the distal end of the plunger 102. The protruding portion 110 ′ includes a plurality (three in this case). ) Columnar locking projections 106 ₁ , 106 ₂ , 106 ₃ are provided. Although not shown, holes are formed on the outer periphery of each joint bar 86 so that the respective locking protrusions 106 ₁ , 106 ₂ , 106 ₃ of the plunger 102 can be locked.

In these cases, when the respective cargo handling levers are arranged at the neutral positions, the respective engagement recesses 103a ₁ , 103a ₂ , 103a ₃ or the respective locking projections 106 ₁ , 106 ₂ , 106 ₃ are respectively connected to the respective joint bars. Engage with circumferential grooves or holes. Thereby, a plurality of cargo handling levers can be fixed at the neutral position at a time, and as a result, it is possible to prevent each cargo handling lever from being inadvertently operated from the neutral position and driving the cargo handling device. In this way, the safety of each cargo handling lever can be improved. The knob 104 ′ shown in FIGS. 11 and 12 has a semicircular disk shape similar to that in each of the above embodiments. In FIGS. 11 and 12, since each knob 104 ′ is viewed from above, it appears in a plate shape. Further, the shape of each knob is not limited to a semicircular shape, and various shapes are conceivable.

  As described above, the present invention is useful for industrial vehicles, and is particularly suitable for those requiring safety of cargo handling levers.

1: Forklift

5: Work device (handling device)

8: Handling lever 86: Joint bar 86a: Circumferential groove (locked part)
87: Hydraulic control valve 88: Spool

100: Solenoid 102: Plunger (locking part)
104: Knob (operation unit)

JP 2008-59303 A (see paragraph [0002] and paragraphs [0021] to [0022])

Claims (6)

In an industrial vehicle, a cargo handling lever fixing device for fixing a cargo handling lever for handling the cargo handling device at a neutral position,
A joint bar is connected to the lower end of the cargo handling lever, and the lower end of the joint bar is connected to a spool of a hydraulic control valve for driving control of the cargo handling device,
On the side of the joint bar, there is provided a locking portion provided so as to be able to approach and leave the joint bar,
The joint bar is provided with a locked portion that can be removably locked at the tip of the locking portion;
In the neutral position of the cargo handling lever, the tip of the locking portion can be locked to the locked portion of the joint bar.
A cargo handling lever fixing device for industrial vehicles. In claim 1,
The driver's seat of the industrial vehicle is provided with a seat switch that is turned on when the operator is seated in the driver's seat and turned off when the operator leaves the driver's seat,
When the seat switch is off, the front end of the locking portion is locked to the locked portion of the joint bar at the neutral position of the cargo handling lever.
A cargo handling lever fixing device for industrial vehicles. In claim 2,
The locking portion is configured by a retractable plunger provided in a solenoid, and when the seat switch is turned off, the current supply to the coil of the solenoid is stopped, so that the plunger is located on the side of the joint bar. Is supposed to protrude into the
A cargo handling lever fixing device for industrial vehicles. In claim 3,
The plunger is inserted through the solenoid housing in the axial direction, and an operator forcibly removes the tip of the plunger from the locked portion of the joint bar at the rear end of the plunger. An operation unit is provided,
A cargo handling lever fixing device for industrial vehicles. In claim 1 or 2,
The locked portion is a groove, hole or notch formed on the outer periphery of the joint bar,
A cargo handling lever fixing device for industrial vehicles. In claim 1,
A plurality of the cargo handling levers are provided, and a plurality of the joint bars are provided corresponding to the cargo handling levers,
The locking portion is composed of a plurality of locking portions that are locked to the locked portions of the joint bars, respectively.
A cargo handling lever fixing device for industrial vehicles.

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