JP2003095589A - Cargo carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate front check in running and cargo handling while facilitating the position adjustment of a cargo handling section in the longitudinal and cross directions of a car body. SOLUTION: A cargo handling carrier vehicle is provided with a primary side arm section 8, at the tip section of which the cargo handling section 4 is supported, in a posture along the directions of the longitudinal and cross directions of the car body, a lift mechanism 5 wherein with the base end section of the section 8 slidden guided along the longitudinal and cross directions in relation to the car body 2 and the intermediate section of the section 8 rocked in the longitudinal and cross directions in relation to car body 2 through the secondary side arm section 9 pivotally supported on the car body 2 and by moving the section 8 up and down, the handling section 4 is moved up and down in nearly the same phase in the longitudinal and cross direction of the car body, and an attitude maintaining mechanism 14, which maintains the attitude of the handling section 4 at a set attitude by rocking the handling section 4 in the longitudinal and cross direction of the car body in relation to the tip section of the section 8 when the handling section 4 is moved up and down when the section 8 is moved up and down by a lift mechanism 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cargo handling vehicle having a cargo handling section provided on the front side of a vehicle body.

[0002]

2. Description of the Related Art A cargo handling vehicle as described above is provided with a control section on a vehicle body and an elevating mechanism for raising and lowering the cargo handling section provided on the front side of the vehicle body with respect to the vehicle body. In response, the lifting mechanism moves the loading / unloading unit up and down with respect to the vehicle body to scoop objects, earth and sand, and other cargo-handling objects, and to carry out cargo-handling operations such as wholesale of cargo-handling objects to predetermined locations. The cargo handling object is run while being held in the cargo handling section and conveys the cargo handling object to a desired location. Examples of such cargo handling transport vehicles include forklifts and shovel loaders.

The above-mentioned forklift is
Conventionally, for example, as disclosed in Japanese Unexamined Patent Application Publication No. 10-218590, a vehicle body provided with a pair of front and rear wheels is provided with a steering section, and in front of the steering section, an elevating mechanism is provided in a vertical direction. A mast having a posture that follows is provided, and the cargo handling section provided with a fork is vertically moved by the mast to move the cargo handling section up and down with respect to the vehicle body to perform cargo handling work.

Further, the shovel loader as described above is
Conventionally, for example, as disclosed in Japanese Patent Application Laid-Open No. 10-46632, a steering section is provided on a vehicle body provided with a pair of front and rear wheels or crawlers, and as a lifting mechanism, a cargo handling section is supported on a tip portion. Also, an arm portion that is swingable in the vehicle front-rear width direction with respect to the vehicle body is provided, and by swinging the arm portion in the vehicle body front-rear width direction with respect to the vehicle body, the cargo handling section is moved up and down with respect to the vehicle body. Cargo work is done.

By the way, in the above-mentioned cargo handling vehicle, the cargo handling section is swung around the axis along the lateral direction of the vehicle body to scoop the object to be cargo-handled. In order to prevent the cargo-handling target from falling, it is necessary to raise and lower the cargo-handling unit with respect to the vehicle body by the elevating mechanism while maintaining the posture such as the scooped-up posture of the cargo-handling unit. Then, in the forklift as described above, the cargo handling unit is held in the set posture, the cargo handling unit is moved in the vertical direction along the mast, and the cargo handling unit is maintained in the set posture while the cargo handling unit is held in the set posture. It is designed to move up and down with respect to the vehicle body. Further, in the shovel loader as described above, the cargo handling section is swingably supported in the front-rear width direction of the vehicle body at the tip of the arm section, and when the arm section is swung in the front-rear width direction of the vehicle body, The section is oscillated in the front-rear width direction of the vehicle body with respect to the tip of the arm section so that the cargo handling section is maintained in the set posture when the cargo handling section is moved up and down with respect to the vehicle body.

[0006]

In the above-mentioned cargo handling vehicle, it is desired to widen the front field of view in the control section in order to make it easy to check the front during traveling and during cargo handling work. At the same time, in order to relatively easily adjust the position of the cargo handling section in the vehicle front-rear width direction during cargo handling work, it is desired to raise and lower the cargo handling section in substantially the same phase in the vehicle front-rear width direction. Conventional cargo handling vehicles cannot meet these two demands.

That is, in the above-mentioned forklift, since the cargo handling section is moved up and down along the mast along the vertical direction, the cargo handling section moves up and down in substantially the same phase in the longitudinal direction of the vehicle body. It is relatively easy to adjust the position of the cargo handling section in the vehicle front-rear width direction, but since the mast along the up-down direction is arranged in front of the control section, the front view of the control section can be adjusted by the mast. Since it will be greatly blocked, the front view in the control section will be narrowed, and it will be difficult to confirm the front when traveling or when handling cargo.

Further, in the shovel loader as described above, since the arm portion is swung in the width direction of the vehicle body,
It is possible to secure a space above or below the arm part where the front part can be confirmed from the control part, and to widen the front view of the control part to facilitate the front part confirmation during traveling or during cargo handling work. However, since the cargo handling section is moved up and down with respect to the vehicle body by swinging the arm section in the vehicle front-rear width direction with respect to the vehicle body, when the cargo handling section is raised and lowered, the cargo handling section moves in the vehicle longitudinal direction. Therefore, it becomes necessary to adjust the position of the cargo handling section in the front-rear width direction of the vehicle body by moving the vehicle body back and forth, and this complicates the cargo handling work.

The present invention has been made paying attention to such a point, and an object thereof is to facilitate the position adjustment of the cargo handling section in the front-rear width direction of the vehicle body at the time of cargo handling work and the like.
An object of the present invention is to provide a cargo-handling transport vehicle capable of widening the forward field of view in the control section and facilitating frontal confirmation during traveling and during cargo-handling work.

[0010]

In order to achieve this object, according to the invention of claim 1, in a cargo handling vehicle having a cargo handling section provided on the front side of the vehicle body, the cargo handling section is provided at the tip. Is provided in a posture along the vehicle body front-rear width direction, and the base end portion of the primary side arm portion is slid with respect to the vehicle body so as to slide along the vehicle body front-rear width direction. In addition, the primary side arm portion is moved in a state in which the intermediate portion of the primary side arm portion is rocked in the vehicle body front-rear width direction with respect to the vehicle body via the secondary side arm portion pivotally supported by the vehicle body. An elevating mechanism is provided for raising and lowering the cargo handling section in substantially the same phase in the longitudinal direction of the vehicle body, and when raising and lowering the cargo handling section by the lifting operation of the primary side arm section by the lifting mechanism, The cargo handling department Is swung operate the vehicle longitudinal width direction to the distal end portion of the following arm, the posture maintaining mechanism for maintaining the handling unit to set position are provided.

That is, the elevating mechanism slides and moves the base end of the primary side arm portion along the longitudinal direction of the vehicle body, and moves the intermediate portion of the primary side arm portion through the secondary side arm portion. By using a mechanism that swings in the width direction, that is, a Scott Russell mechanism, it is possible to raise and lower the primary side arm portion and raise and lower the cargo handling portion in substantially the same phase in the front-rear width direction of the vehicle body.
Then, by using the Scott Russell mechanism to raise and lower the primary side arm portion, while slidingly moving the primary side arm portion along the vehicle body longitudinal direction,
Since it is possible to swing the vehicle in the front-rear direction, it is possible to secure a space above or below the primary side arm part where the front part can be confirmed from the control part and to widen the front view of the control part. Become. Therefore, by raising and lowering the primary side arm portion by the raising and lowering mechanism, while raising and lowering the cargo handling portion in substantially the same phase in the vehicle longitudinal direction,
Moreover, it is possible to widen the front field of view in the control section.

When the cargo handling section is moved up and down with respect to the vehicle body, the cargo handling section is swung in the longitudinal direction of the vehicle body with respect to the tip of the primary arm so that the cargo handling section can be moved in a horizontal posture, for example. Since a posture maintaining mechanism for maintaining the set posture is provided, with the posture maintaining mechanism maintaining the cargo handling section in the set posture, the lifting mechanism almost moves the cargo handling section relative to the vehicle body in the longitudinal direction of the vehicle body. It is possible to move up and down in the same phase, and it is possible to perform a desired cargo handling operation such as scooping without dropping the cargo handling object from the cargo handling section.

In summary, according to the first aspect of the present invention, the front view of the steering section is improved while facilitating the position adjustment of the cargo handling section in the front-rear width direction of the vehicle body during the cargo handling work. It is possible to provide a cargo handling vehicle that can be widened to facilitate front confirmation during traveling and cargo handling work.

According to the second aspect of the present invention, the posture maintaining mechanism vertically moves in synchronization with the vertically moving operation of the primary arm portion by the vertically moving mechanism, and one end of the vertically moving mechanism is pivoted to the vertically moving portion. The lifting and lowering portion is configured to include a connecting portion that is supported and has the other end pivotally supported by the cargo handling portion. The elevating portion includes a tip end portion and a base end portion of the primary side arm portion in the vehicle body front-rear width direction. It is arranged in between.

That is, when the raising / lowering mechanism raises / lowers the primary side arm portion, the raising / lowering portion rises / lowers in synchronization with the raising / lowering operation of the primary side arm portion, and the connecting portion raises / lowers the connecting portion in association with the raising / lowering of the raising / lowering portion. Also, since it swings in the vehicle front-rear width direction with respect to the cargo handling section, the cargo handling section is approximately in phase with the vehicle body in the front-rear width direction with the lifting mechanism while the cargo handling section is maintained in the set posture. It is possible to raise and lower with.
Since the elevating part is disposed between the tip end part and the base end part of the primary side arm part in the vehicle body front-rear width direction,
It is possible to shorten the length of the connecting portion that connects the elevating unit and the cargo handling unit, and it is possible to reduce the cost and prevent the bending of the connecting unit itself.

According to a third aspect of the present invention, the elevating mechanism includes a cylinder connected to the secondary arm section and the vehicle body, and the secondary arm section is extended by the expansion and contraction operation of the cylinder. It is configured to swing in the vehicle front-rear width direction with respect to the vehicle body, and to raise and lower the primary side arm portion in conjunction with the swinging movement of the secondary side arm portion.

That is, when the cylinder is expanded and contracted,
The secondary arm swings in the front-rear width direction of the vehicle body, and in conjunction with the swinging operation of the secondary arm portion, the base end of the primary arm portion slides along the front-rear width direction of the vehicle body. At the same time, the middle part of the primary side arm part is oscillated in the front-rear width direction of the vehicle body via the secondary side arm part, and the cargo handling part is moved up and down in substantially the same phase in the front-rear width direction of the vehicle body. By the expansion and contraction operation of the cylinder, the cargo handling section can be raised and lowered in substantially the same phase in the longitudinal direction of the vehicle body. Then, instead of directly raising and lowering the primary side arm portion by the expansion and contraction operation of the cylinder, first by the extension and contraction operation of the cylinder, the secondary side arm portion is swung in the longitudinal direction of the vehicle body, and then the secondary side arm portion. In conjunction with the rocking motion of
Since the primary arm is moved up and down, the cargo handling part is moved up and down relative to the stroke of the cylinder by the amount of the secondary arm rather than when the primary arm is directly moved up and down by the expansion and contraction of the cylinder. It is possible to increase the range. Therefore, the required stroke of the cylinder can be reduced with respect to the ascending / descending range of the cargo handling section, so that a cylinder having a relatively small stroke can be adapted to achieve compactness and cost reduction. Is possible.

According to the fourth aspect of the invention, the lifting mechanism directs the base end portion of the primary arm portion in the slide guide movement direction when the cargo handling portion is within the set low position range. The cylinder is expanded and contracted to raise and lower the secondary arm.

That is, when the cargo handling section is within a set low position range such as the lowest position,
Since the cylinder is configured to extend and retract in the slide guide movement direction of the base end of the primary arm, and the secondary arm swings, the extension of the cylinder causes the primary arm to move. It becomes easy to slide and move the base end portion of the section, and it is possible to smoothly perform the operation of raising and lowering the cargo handling section from the state in which the cargo handling section exists within the set low position range.

By the way, normally, since the cargo handling section is allowed to travel in the set low position range,
The initial position of the cargo handling part when performing cargo handling work is within the set low position range, and it is possible to smoothly perform lifting operations from within the set low position range, so cargo handling work can be performed smoothly. And becomes effective.

According to the fifth aspect of the invention, there is provided the regulation means for regulating the relative movement of the cargo handling section in the lateral direction of the vehicle body with respect to the vehicle body.

That is, for example, when the vehicle body is rotationally moved, a force for moving the vehicle body in the lateral direction of the vehicle body acts on the primary arm portion with the rotational movement of the vehicle body. , The large effect is exerted on the cargo handling section supported by the tip of the primary side arm section. Therefore,
In order to restrict the relative movement of the cargo handling section in the lateral direction of the vehicle body with respect to the vehicle body, it is necessary to strengthen the strength of the primary side arm section in the lateral direction of the vehicle body, resulting in an increase in cost.

According to the fifth aspect of the present invention, however, since the regulating means for regulating the relative movement of the cargo handling section in the lateral direction of the vehicle body with respect to the vehicle body is provided, the strength of the primary arm portion in the lateral direction of the vehicle body is improved. Even without strengthening, it is possible to restrict the cargo handling section from moving relative to the vehicle body in the lateral direction of the vehicle body by the restricting means, and it is possible to reduce the cost.

According to the invention of claim 6, the vehicle body is a vehicle body for a forklift. That is, by the cooperation of the first aspect, in a forklift as a cargo handling vehicle, the cargo handling section is substantially in the same phase in the front-rear width direction of the vehicle body even if there is no mast which is conventionally provided in front of the control section. It is possible to move up and down, the front field of view in the control section can be widened, and the advantages that the front confirmation can be easily performed during traveling and during cargo handling work become remarkable.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION An example in which a forklift is applied as a cargo handling vehicle according to the present invention will be described with reference to the drawings. This forklift truck, as shown in FIGS.
A forklift vehicle body 2 including a control unit 1, a cargo handling unit 4 including a fork device 3, an elevating mechanism 5 for raising and lowering the cargo handling unit 4 with respect to the vehicle body 2, and the like.

A pair of left and right wheels 6 is provided on each of the front and rear portions of the vehicle body 2, and a cargo handling section 4 is arranged in front of the steering section 1 provided on the vehicle body 2. Seat 7,
It is composed of a lifting operation unit 20 for operating the lifting mechanism 5, a steering unit 21 for operating the vehicle body 2, and the like. In addition, in this embodiment, the joystick type is used as the raising / lowering operation unit 20, but various types such as a lever type can be applied, and also various types can be applied to the steering unit 21. Is. The drive devices such as the engine, the mission, and the differential gear of the forklift are appropriately arranged inside the vehicle body 2.

Incidentally, for getting on and off the driver's seat 7, for example, the driver's seat 7 is configured to be rotatable about an axis extending in the up-down direction, and a step-like getting-on / off member is housed in a lateral side portion or a rear portion of the vehicle body 2. It is possible to rotate the driver's seat 7 around an axis extending in the up-down direction, take out the housed member, and get on and off the driver's seat 7. However, various other configurations are applicable. It is possible. Further, in the illustrated forklift, the head guard is not attached to the vehicle body 2, but the head guard may be attached to the vehicle body 2 as necessary.

The elevating mechanism 5 elevates and lowers the cargo handling section 4 by a primary arm portion 8 provided in a posture along the longitudinal direction of the vehicle body, a secondary arm portion 9 pivotally supported by the vehicle body 2, and an extension / contraction operation. It is configured to include an elevating cylinder 10 and the like as a cylinder for. The elevating mechanism 5 extends and retracts the elevating cylinder 10 to slide and move the base end portion 8b of the primary arm portion 8 relative to the vehicle body 2 along the longitudinal direction of the vehicle body and the primary arm portion. 8
In a state in which the intermediate portion of the vehicle is rocked in the longitudinal direction of the vehicle body with respect to the vehicle body 2 via the secondary arm portion 9, the primary arm portion 8 is moved up and down to move the cargo handling section 4 in the vehicle longitudinal direction. Is configured to move up and down in almost the same phase. Further, the lifting mechanism 5 causes the secondary arm portion 9 to swing in the vehicle body front-rear width direction with respect to the vehicle body 2 by the expansion and contraction operation of the lifting cylinder 10, and is interlocked with the swing operation of the secondary arm portion 9. It is configured to raise and lower the primary side arm portion 8.

The primary arm portion 8 is shown in FIGS.
As shown in FIG. 5, a pair of left and right primary arm portions 8 are provided at a distance in the lateral width direction of the vehicle body, and each of the pair of left and right primary arm portions 8 has a cargo handling portion 4 supported at its tip end portion 8a so as to be swingable in the vehicle longitudinal direction. An intermediate portion thereof is swingably supported around an axis A along the lateral direction of the vehicle body. A base end portion 8b of the primary side arm portion 8 is slidably supported by the vehicle body 2 along the vehicle body front-rear width direction. In addition, the base end portions 8b of the pair of left and right primary arm portions 8 are connected by the slide shaft portion 19 along the lateral width direction of the vehicle body.
By moving the roller 11 provided on the base end portion 8b of the vehicle along the guide groove 12 formed on the vehicle body 2, the base end portions 8b of the pair of left and right primary side arm portions 8 are synchronized with each other. It is configured to slide and move along the direction.

The secondary arm section 9 is shown in FIGS.
As shown in Fig. 4, the middle portion is formed in a dogleg shape protruding rearward in a side view, and in a state in which a space is provided in the lateral width direction of the vehicle body from a position slightly rearward of the middle portion in a plan view. It is branched into a branch portion 9a. The front end portion of the secondary arm portion 9 is pivotally supported by the vehicle body 2 so as to be swingable in the vehicle front-rear width direction, and the branch portion 9 of the secondary arm portion 9 is supported.
Each of a is swingably supported around an axis A along the lateral direction of the vehicle body.

The primary side arm portion 8 and the secondary side arm portion 9
The positional relationship between the pair of left and right primary side arm portions 8 is connected to the both end portions of the shaft portion 13 along the lateral direction of the vehicle body. The branch portion 9a of the secondary arm portion 9 is attached to the shaft portion 13 in the vehicle front-rear width so that the secondary arm portion 9 is disposed inside the primary side arm portion 8 in the vehicle body lateral width direction. It is pivotally supported so that it can swing in any direction.

Incidentally, by disposing the secondary arm portion 9 between the pair of left and right primary arm portions 8 in the lateral direction of the vehicle body, the primary arm portion 8 with respect to the cargo handling portion 4 is arranged.
The fulcrum can be located near both ends in the lateral direction of the vehicle body, so that the twisting moment about the axial center along the longitudinal direction of the vehicle body generated in the cargo handling section 4 can be reduced.

As shown in FIG. 6, the elevating cylinder 10 has a posture inclined rearward in the vehicle front-rear width direction when the cargo handling section 4 is present in a set low position range such as the lowest position. The secondary side arm portion 9 and the vehicle body 2 are connected to each other. The elevating cylinder 10 is swingably supported with respect to the vehicle body 2, and the elevating cylinder 10 is extended / contracted to cause the secondary arm portion 9 to oscillate in the vehicle longitudinal direction with respect to the vehicle body 2. , Through the shaft portion 13, the primary side arm portion 8 is moved up and down in conjunction with the swinging movement of the secondary side arm portion 8 to move the cargo handling portion 4 up and down with respect to the vehicle body 2. Has been done.

In this forklift, as shown in FIGS. 1 to 4, when the lifting / lowering mechanism 5 moves up and down the loading / unloading section 4 to move the loading / unloading section 4 up and down.
An attitude maintaining mechanism 14 for maintaining the cargo handling section 4 in a set attitude is provided by swinging the front end portion 8a of the primary arm portion 8 in the front-rear width direction of the vehicle body. Then, the posture maintaining mechanism 14 includes an elevating part 15 that elevates and lowers in synchronization with the elevating operation of the primary arm part 8 by the elevating mechanism 5, and one end part of the elevating part 1.
5 and a connecting portion 16 having the other end pivotally supported by the cargo handling section 4, and the elevating section 15 is formed in the vehicle body front-rear width direction with the tip end portion 8a of the primary side arm portion 8 and the base portion. Edge 8
It is arranged between b and.

In addition, as shown in FIGS. 8 and 9, the elevating part 15 comprises a vertical member 15a extending in the vertical direction and a horizontal member 15b extending in the horizontal direction.
The upper end of 5a and the intermediate part of the horizontal member 15b are fixed,
The vertical intermediate portion of the vertical member 15a is fixedly supported by the shaft portion 13 along the vehicle body lateral width direction. And the connecting part 1
A pair of left and right 6 are provided so as to be swingable around an axis C extending along the vehicle lateral width direction with respect to the cargo handling section 4 and extending along the vehicle lateral width direction with respect to the horizontal member 15b of the elevating section 15. It is swingably supported around D. Further, the lower end portion of the vertical member 15b and the vehicle body 2 are connected by a connection support portion 17, and the connection support portion 17 is swingably supported with respect to the vehicle body 2 along the vehicle body front-rear width direction and The lower end of the member 15b is swingably supported in the front-rear width direction of the vehicle body.

In this way, the elevating part 15 is moved up and down in synchronization with the elevating operation of the primary side arm part 8 through the shaft core 13 which is interlocked with the swinging operation of the secondary side arm part 9, and the elevating part 15 is moved up and down. The coupling section 16 is swung with respect to the cargo handling section 4 around the axis C as the section 15 is moved up and down, and is swung around the axis D with respect to the lifting section 15 to bring the cargo handling section 4 into the set posture. In the maintained state, the cargo handling section 4 is moved up and down with respect to the vehicle body 2 in substantially the same phase in the vehicle body front-rear width direction.

The operation of the lifting mechanism 5 will be described below. When the lifting cylinder 10 is expanded and contracted,
The secondary arm 9 is rocked in the longitudinal direction of the vehicle body, and the base end 8b of the primary arm 8 is moved relative to the vehicle body 2 in conjunction with the rocking motion of the secondary arm 9. While being slid along the front-rear width direction, the intermediate portion of the primary-side arm portion 8 is oscillated in the front-rear width direction of the vehicle body through the secondary-side arm portion 9 to move the primary-side arm portion 8 up and down. The cargo handling section 4 is moved up and down in substantially the same phase in the front-rear width direction of the vehicle body.

In this way, the base cylinder 8b of the primary arm 8 is slid and guided along the longitudinal direction of the vehicle body by the expansion and contraction operation of the lifting cylinder 10, and
By utilizing a mechanism for swinging the middle portion of the primary side arm portion 8 in the vehicle front-rear width direction via the secondary arm portion 9, that is, a Scott Russell mechanism, the cargo handling section 4 is in substantially the same phase in the vehicle body front-rear width direction. I try to raise and lower it.

The elevating mechanism 5 is arranged so that the elevating cylinder 10 moves toward the slide guide movement direction of the base end 8a of the primary arm 8 when the cargo handling section 4 is within the set low position range.
Is expanded and contracted to swing the secondary arm portion 9. In addition, when the cargo handling unit 4 is within the set low position range, the primary side arm unit 8
The elevating cylinder 10 is extended / contracted toward the slide guide movement direction of the base end 8a of the, and the extension / contraction operation of the elevating cylinder 10 facilitates the slide guide movement of the base end 8a of the primary side arm portion 8 for cargo handling. The operation for raising and lowering the cargo handling section 4 from the state in which the section 4 exists within the set low position range can be performed smoothly.

A specific description will be given of the lifting operation of the cargo handling section 4. Since the operation of the lifting cylinder 10 is simply reversed when the cargo handling section 4 is moved up and down and when it is lowered, when the cargo handling section 4 is within the set low position range such as the lowest position, the posture maintaining mechanism is maintained. Only the case where the lifting / lowering mechanism 5 raises the cargo handling unit 4 in a state in which the cargo handling unit 4 is maintained in the set posture at 14 will be described.

As shown in FIG. 5, when the cargo handling section 4 is within the set low position range such as the lowest position, the lifting cylinder 10 is used.
Is extended toward the slide guide movement direction of the base end portion 8b of the primary side arm portion 8, that is, toward the rear side to swing the secondary side arm portion 9 around the axis B. As the secondary arm portion 9 swings, the shaft portion 13 is moved to the vehicle body 2
It will be rocked in the front-back width direction of the vehicle,
In conjunction with the swinging operation of the secondary arm portion 9, the base end portion 8a of the primary arm portion 8 is slid and moved rearward along the vehicle body front-rear width direction, and the primary arm portion 8 is also moved.
Of the primary side arm portion 8 is swung around the axis A.
Is moved up and down. In this way, the lifting cylinder 10
When the primary side arm portion 8 is moved up and down through the secondary side arm portion 9 by the extension operation of
While swinging in the vehicle front-rear width direction with respect to the tip of the primary side arm portion 8, the primary arm 8 is raised in substantially the same phase in the vehicle front-rear width direction.

Further, interlocking with the swinging operation of the secondary arm portion 9 by the extension operation of the lifting cylinder 10, the lifting portion 15 is synchronized with the lifting operation of the primary arm portion 8 via the shaft portion 13. By moving up and down, the connecting portion 16 is swung around the axis C with respect to the cargo handling portion 4 as the lifting portion 15 is moved up and down, and is swung around the axis D with respect to the lifting portion 15 to carry the cargo. With the section 4 maintained in the set posture, the cargo handling section 4 is moved to the vehicle body 2
On the other hand, the vehicle is moved up and down in substantially the same phase in the front-back width direction of the vehicle body.

As shown in FIGS. 6 and 7, the elevating cylinder 10 is extended with respect to the vehicle body 2 while swinging in the longitudinal direction of the vehicle body so that the primary arm portion 8 is substantially horizontal. Until the posture, the base end portion 8b of the primary side arm portion 8 is slid and moved rearward, and after the primary side arm portion 8 takes a substantially horizontal posture, the base end portion 8b of the primary side arm portion 8 is moved. The slide guide is moved to the front side.

In this way, by using the Scott Russell mechanism to raise and lower the primary side arm portion 8, the cargo handling portion 4 can be raised and lowered in substantially the same phase in the longitudinal direction of the vehicle body. Primary arm part 8
Since it is possible to secure a sufficient space above or below the vehicle for confirming the front from the control section 1, while facilitating the position adjustment of the cargo handling section 4 in the vehicle body front-rear width direction at the time of cargo handling work or the like. Therefore, the front view of the control section can be widened to facilitate the front confirmation during traveling and during cargo handling work.

By the way, in this forklift, the operator sitting on the driver's seat 7 can see the tip of the fork device 3 by checking the primary arm section 8, the secondary arm section 9, and the driver's seat 7. By adjusting the relationship, the front end of the fork device 3 can be confirmed when scooping the article, and the burden on the operator of the cargo handling work can be reduced. In particular, when the cargo handling unit 4 is in a lower position than the control unit 1, such as when traveling or when picking up articles, the effect that the front view can be increased and the front confirmation can be easily performed is remarkable. It is supposed to be.

Although not shown, a hydraulic tilt cylinder is provided at the tip of the primary side arm portion 8 so that the cargo handling section 4 can move in the lateral direction of the vehicle body with respect to the tip end of the primary side arm portion 8. It is configured so as to be rockably driven around an axis along the axis. Then, when picking up an article by the fork device 3 or when traveling with the article transferred, the tilt lever provided in the control section 1 is operated to drive the tilt cylinder, and the cargo handling section 4 is temporarily moved. The tip of the side arm portion 8 is swingably driven around an axis along the lateral width direction of the vehicle body.

The installation position of the tilt cylinder is not limited to the tip portion of the primary side arm portion 8, but is provided, for example, at the connection portion between the front end portion of the connection support portion 17 and the vehicle body 2 to drive the tilt cylinder. As a result, the elevating part 15 is swung around the shaft part 13, and the cargo handling part 4 is swung about the axial center along the lateral direction of the vehicle body with respect to the tip end part of the primary side arm part 8 via the connecting part 16. It is also possible to drive.

Further, the forklift is provided with a regulation means for regulating the relative movement of the cargo handling section 4 in the lateral direction of the vehicle body with respect to the vehicle body 2, and the vehicle body 2 is rotated while the cargo handling section 4 holds the cargo handling target. Even if it is moved, the regulation means regulates the relative movement of the cargo handling section 4 with respect to the vehicle body 2 in the lateral direction of the vehicle body. When the restriction means is further described, as shown by the dotted lines in FIGS. 1 and 4, the tip of the primary side arm portion 8 is located at a portion corresponding to between the primary side arm portions 8 of the vehicle body 2 in the lateral direction of the vehicle body. A contact portion 18 that restricts the movement of the primary side arm portion 8 in the lateral direction of the vehicle body is formed by coming into contact with an inner portion near the portion 8a. Then, when the vehicle body 2 is pivotally operated, even if a force to move in the lateral direction of the vehicle body acts on the cargo handling section 4, the inner portion near the tip portion 8a of the primary side arm portion 8 is
By contacting the contact portion 18, the relative movement of the cargo handling portion 4 in the vehicle width direction with respect to the vehicle body 2 is restricted.

[Other Embodiment] (1) In the above embodiment, the secondary arm portion 9 is arranged inside the pair of left and right primary arm portions 8 in the lateral direction of the vehicle body. A pair of left and right secondary arms 9 are provided at a distance in the lateral direction of the vehicle body, and the primary arm 8 is disposed inside the pair of left and right secondary arms 9. Is also possible.
In this case, a pair of left and right primary side arm portions 8 are provided so that the fulcrum of the primary side arm portion 8 with respect to the cargo handling portion 4 is two, or one primary side arm portion 8 is provided and the primary cargo arm 4 is provided. It is possible to use only one fulcrum of the primary side arm portion 8.

(2) In the above embodiment, the posture maintaining mechanism 1
4 is composed of an elevating part 15 and a connecting part 16, and the elevating part 15
Is arranged between the tip end portion 8a and the base end portion 8b of the primary side arm portion 8 in the vehicle front-rear width direction, but is not limited to this configuration, and for example, the primary side arm portion By providing a posture maintaining member along the up-down direction at the base end portion 8b of 8 and pivotally supporting one end of the connecting portion 16 to the posture maintaining member and the other end to the cargo handling portion 4, It is also possible to raise and lower the cargo handling section 4 by the lifting mechanism 5 while maintaining the posture of 4 in the set posture.

(3) In the above embodiment, the lifting cylinder 1
0 is provided between the secondary arm 9 and the vehicle body 2,
By the expansion and contraction operation of the lifting cylinder 10, the secondary arm 9
Although an example of raising and lowering the primary side arm portion 8 through the swinging operation of the above has been described, the raising and lowering cylinder 10 is moved to the primary side arm portion 8
It is also possible to provide a structure in which the primary side arm portion 8 is directly moved up and down by the expansion and contraction operation of the lift cylinder 10 by being provided between the vehicle and the vehicle body 2.

(4) In the above-described embodiment, the contact portion 18 is formed in a portion corresponding to the primary arm portion 8 of the vehicle body 2 in the vehicle body lateral width direction, so that the cargo handling portion 4 with respect to the vehicle body 2 in the vehicle body lateral width direction. Although the regulation means for regulating the relative movement of the vehicle body is configured, for example, the cargo handling section 4 is provided with a convex portion projecting toward the vehicle body 2 side, and the vehicle body 2 is provided with a concave portion fitted to the convex portion. The relative movement of the cargo handling section 4 in the lateral direction of the vehicle body with respect to the vehicle body 2 may be regulated by fitting the convex portion and the concave portion, and various constitutions can be applied as the constitution of the regulating means.

(5) In the above embodiment, the forklift in which the driver is provided with the driver's seat 7 and the operator sits and operates the driver's seat 7 has been illustrated. However, the operator can use a standing seat or simply provide a driver's space. It can be used as a forklift that stands and steers.

(6) In the above embodiment, an example in which the cargo handling vehicle according to the present invention is adapted to a forklift is shown. However, the cargo handling vehicle is not limited to a forklift and can be applied to other cargo handling vehicles such as shovel loaders. Is.

[Brief description of drawings]

1] Side view of a forklift

FIG. 2 is a plan view of a forklift

FIG. 3 is a rear perspective view of the forklift.

FIG. 4 is a front perspective view of the forklift.

FIG. 5 is a side view showing a lifting mechanism.

FIG. 6 is a side view showing a lifting mechanism.

FIG. 7 is a side view showing the lifting mechanism.

FIG. 8 is an exploded perspective view showing a lifting mechanism.

FIG. 9 is a perspective view showing a lifting mechanism and a posture maintaining mechanism.

[Explanation of symbols]

2 Car body for forklift 3 cargo handling department 5 Lifting mechanism 8 Primary arm 9 Secondary arm 10 cylinders

Claims (6)

[Claims] 1. A cargo handling transport vehicle in which a cargo handling section is provided on the front side of a vehicle body, wherein a primary side arm portion having a tip end portion supporting the cargo handling section is provided in a posture along a longitudinal direction of the vehicle body. A secondary arm in which a base end portion of the primary side arm portion is slidably guided with respect to the vehicle body along the longitudinal direction of the vehicle body, and an intermediate portion of the primary side arm portion is pivotally supported by the vehicle body. The primary-side arm portion is moved up and down in a state in which the vehicle body is oscillated in the front-rear width direction with respect to the vehicle body through a portion to raise and lower the cargo handling portion in substantially the same phase in the front-rear width direction of the vehicle body. An elevating mechanism is provided, and when the elevating mechanism elevates and lowers the cargo handling section to raise and lower the cargo handling section, the cargo handling section rocks in the vehicle longitudinal direction with respect to the tip of the primary side arm. Move the load A cargo handling transport vehicle provided with a posture maintaining mechanism for maintaining the officer's body in a set posture. 2. An attitude maintaining mechanism, an elevating part that moves up and down in synchronization with an elevating operation of the primary arm part by the elevating mechanism, one end of which is pivotally supported by the elevating part, and the other end of which is the cargo handling. A connecting portion pivotally supported by a portion, and the elevating portion is disposed between the tip end portion and the base end portion of the primary side arm portion in the vehicle body front-rear width direction. The cargo handling vehicle according to 1. 3. The elevating mechanism includes a cylinder connected to the secondary side arm portion and the vehicle body, and the secondary side arm portion is moved with respect to the vehicle body in the vehicle front-rear width direction by expansion and contraction of the cylinder. The cargo handling vehicle according to claim 1 or 2, wherein the primary side arm section is moved up and down by interlocking with the swinging operation of the secondary side arm section. 4. The elevating mechanism expands and contracts the cylinder toward a slide guide movement direction of a base end portion of the primary side arm portion when the cargo handling portion is within a set low position range, The cargo handling vehicle according to claim 3, wherein the secondary arm section is configured to swing. 5. The cargo handling vehicle according to any one of claims 1 to 4, further comprising restriction means for restricting relative movement of the cargo handling section in the lateral direction of the vehicle body with respect to the vehicle body. 6. The cargo handling vehicle according to claim 1, wherein the vehicle body is a vehicle body for a forklift.