JPH0710483A - Order picking type forklift - Google Patents

Abstract

PURPOSE:To improve operability of a steering wheel and makes a steered wheel steerable securely by setting up a steering post on the fork side of an operator's seat and making the posture of the steering wheel provided on a top face of the steering post rotatably nearly parallel with a top face of the operator's seat. CONSTITUTION:When an operator operates and rotates a steering wheel 15 to steer and rotate a steering and driving wheel 3, he can operate the steering wheel 15 by utilizing a large space above a steering post 14 because the steering wheel 15 is mounted on a top face of the steering post 14. Also, as the posture of the steering wheel 15 is parallel with a top face of an operator's seat 12, the operator can operate and rotate the steering wheel 15 merely by moving his arm forward and backward without moving his arm up and down. As a consequence, the operator moves his arm forward and backward by utilizing large space to realize comfortable operability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an order picking type forklift truck having a driver's cab which moves up and down together with a fork, and more particularly to a steering wheel mounting structure and a steering mechanism for steering steered wheels from the driver's cab. is there.

[0002]

2. Description of the Related Art A conventional order-picking type forklift has a structure as shown in FIG.

Order picking type forklift 90
A mast 92 is erected from substantially the center of the vehicle body frame 91, and a driver's cab 93 moves up and down along the mast 92. The mast 92 of the cab 93
A finger board 94 is erected on the side end,
A fork 95 for placing the load W is extended at the opposite end. A driving operation mechanism such as a steering wheel (not shown) is arranged on the side surface of the finger board 94. By operating this driving operation mechanism, it is possible to operate the steered wheels (not shown) provided on the lower side of the vehicle body frame 91 to steer the order picking type forklift 90.

However, in this order picking type forklift 90, the driver has to operate with the load W placed on the fork 95 as a back.
The worker is looking diagonally rearward to monitor the collapse of the load W. Therefore, when performing a driving operation while monitoring the load W on the fork 95, the driving operation is performed in an unreasonable posture in which the body must be twisted obliquely backward.

As a countermeasure against this, Japanese Patent Publication No. 55-23198
An order picking type forklift as shown in Japanese Patent Publication has been proposed. This order-picking type forklift has a control box equipped with a steering wheel and other drive operation mechanism at the end of the driver's cab on the fork direction side, and this control box is slidable in the vehicle width direction. is there. Therefore, the driver can perform a driving operation while monitoring the load, and the control box does not get in the way when handling the load.

[0006]

However, in the above-mentioned order picking type forklift, the steering wheel is attached to the side portion of the control box which is erected on the cab. That is, the rotation direction of the steering wheel is substantially orthogonal to the driver's cab. Therefore, a driver who performs a driving operation in a standing posture must rotate the steering wheel while moving both arms up and down between the abdomen and the control box in a narrow space. For this reason, there is a problem that the driver not only has poor operability in rotating the steering wheel, but also has difficulty in frequently rotating the steering wheel.

Further, in this order picking type forklift, the rotation of the steering wheel is transmitted to the steered wheels via a chain that is hung around the inside of the control box. However, since the driver handles the load around the control box, the vibration and impact of the load are easily transmitted to the control box. As a result, the chain may become loose, and the looseness may cause the chain to come off, making it impossible to steer the steered wheels by rotating the steering wheel.

The present invention has been made to solve the above problems, and an object thereof is to improve the operability of a steering wheel and to steer the steered wheels by operating the steering wheel. It is to provide an order picking type forklift.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the invention of claim 1 is one in which a mast is erected on a vehicle body frame, and a cab is forked along the mast. In an order-picking type forklift that is raised and lowered together with a steering post, a steering post is erected on the fork side of the driver's cab, and a steering wheel is rotatably provided on the upper surface of the steering post. The main point is to make them substantially parallel.

According to a second aspect of the present invention, a steering post is installed on the fork side of a driver's cab which rises and lowers integrally with the fork along a mast erected on the body frame, and a steering wheel is provided on the upper surface of the steering post. The steering wheel is arranged so that the posture thereof is substantially parallel to the upper surface of the driver's cab, the steering mechanism is operated based on the rotation operation of the steering wheel, and the steering wheel provided on the lower side of the vehicle body frame is a steering device. In the order picking type forklift that controls steering through the steering mechanism, the steering mechanism is provided in the steering post, and is provided in the cab and a first transmission mechanism that operates by rotation of a steering wheel.
The take-up pulley that rotates by the operation of the first transmission mechanism, and a pair of wires that are connected to the steering device and that are wound around the take-up pulley so that their winding directions are different from each other. Is the gist.

According to the third aspect of the present invention, the steering post is installed on the fork side of the driver's cab which is vertically moved together with the fork along the mast erected on the vehicle body frame, and the steering wheel is provided on the upper surface of the steering post. The steering wheel is arranged so that the posture thereof is substantially parallel to the upper surface of the driver's cab, the steering mechanism is operated based on the rotation operation of the steering wheel, and the steering wheel provided on the lower side of the vehicle body frame is a steering device. In an order-picking type forklift that controls steering through a steering mechanism, the steering mechanism is provided in the steering post, and is provided in the driver's cab with a second transmission mechanism that operates by rotation of a steering wheel.
A transmission shaft that rotates by the operation of the second transmission mechanism, a pulley that is provided on the driver's cab and that suspends a wire that is connected to a steering device that is provided on a vehicle body frame, and a pulley that is connected to the transmission shaft The gist of the invention is that it comprises a drive transmission mechanism for rotating the.

[0012]

According to the present invention, the steering wheel is arranged on the upper surface of the steering post so as to be substantially parallel to the upper surface of the driver's cab. The space can be used to rotate the steering wheel. Also,
The driver can rotate the steering wheel by moving the arm in the front-back direction without moving the arm up and down.

According to the second aspect of the present invention, by rotating the steering wheel, the second transmission mechanism in the steering post operates and the winding pulley provided in the driver's cab rotates. . Due to the rotation of the winding pulley, one wire having different winding directions is wound and the other wire is unwound. The operation of the pair of wires operates the steering device to steer the steered wheels.

Further, according to the third aspect of the present invention, by rotating the steering wheel, the second transmission mechanism in the steering post operates and the transmission shaft provided in the cab rotates. When this transmission shaft rotates, the pulley provided on the cab rotates via the drive transmission mechanism. Due to the rotation of the pulley, the wire wound around the pulley operates, the steering device operates, and the steered wheels are steered.

[0015]

【Example】

[First Embodiment] A first embodiment of the order picking type forklift according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a body frame 2 is provided on the order picking type forklift 1. Steering and driving wheels 3 are provided below the vehicle body frame 2, and at the lower front portion of the vehicle body frame 2,
Driven wheels 4 are provided which are driven according to the steering and driving wheels 3. Further, a steering / driving wheel support 5 is arranged in the vehicle body frame 2 above the steering / driving wheels 3.
The steering and driving wheel 3 is rotatably connected to the steering and driving wheel support 5 via a connecting mechanism (not shown).

The steering / driving wheel support 5 rotates the steering / driving wheel 3 horizontally with respect to the floor surface to steer the traveling direction of the order picking type forklift 1. Further, a drive motor 6 is disposed above the steering / driving wheel support 5, and the steering / driving wheel 3 is driven by the driving motor 6.
Rotates in a direction perpendicular to the floor surface and causes the order picking type forklift 1 to travel. The steering / driving wheel 3 is rotated in the forward / reverse direction by the forward / reverse rotation of the drive motor 6, so that the order picking type forklift 1 can be moved forward or backward.

A pair of left and right outer masts 7 are erected on the left side of the body frame 2. A pair of left and right inner masts 8 are arranged inside the pair of outer masts 7.
It is arranged so as to go up and down along. A piston rod (not shown) of a hydraulically controlled lift cylinder 9 is connected to the inner mast 8, and the piston rod of the lift cylinder 9 expands and contracts, whereby the inner mast 8
Is movable up and down with respect to the outer mast 7.

A lifting pulley 10 is rotatably supported on the upper portion of the inner mast 8. A lifting chain 11 having one end fixed to the outer mast 7 is hung on the lifting pulley 10. The other end of the chain 11 is connected to a driver's cab 12 which will be described later and is provided so as to be able to move up and down with respect to the inner mast 8 (connection state is not shown).

When the piston rod of the lift cylinder 9 extends, for example, by a length L with respect to the outer mast 7, the elevating pulley 10 moves up L with respect to the outer mast 7 together with the inner mast 8. At this time, the cab 12 is designed to be raised by a length of 2 L with respect to the outer mast 7. Similarly, when the piston rod of the lift cylinder 9 contracts with respect to the outer mast 7 by the length L, the inner mast 8 descends by the length L. At this time,
The cab 12 is designed to be lowered by a length of 2 L with respect to the outer mast 7.

An operator can board the cab 12. Further, as shown in FIGS. 1 to 4, a pair of left and right forks 13 are attached to the front portion of the cab 12 in the vehicle traveling direction.
Moves up and down together with the cab 12. In this case, the worker who has boarded the cab 12 also moves up and down.

On the fork 13 side of the upper surface of the cab 12, a vertically elongated box-shaped steering post 14 is provided.
Is erected. On the upper surface of the steering post 14, a steering wheel 15, various levers 16 such as a cargo handling lever, a meter 17, and a switch 1 are provided.
8 etc. are provided. The steering wheel 15 is rotatably supported on the upper surface of the steering post 14 so as to be parallel to the upper surface of the cab 12.
When the steering wheel 15 is rotated, the steering / driving wheel 3 can be steered via a steering mechanism SK and a steering device SS described later.

Next, the structure of the steering system SS will be described. As shown in FIG. 1, a rotation detector 20 is arranged in a horizontal direction with respect to the vehicle body frame 2 in the front lower portion inside the vehicle body frame 2. The rotation shaft 21 of the rotation detector 20 projects outward from the vehicle body frame 2, and the tip of the rotation shaft 21 is arranged on the lower side of the inner mast 8. A chain sprocket 22 is attached to the tip of the rotary shaft 21.

On the output side (not shown) of the rotation detector 20,
The reduction gear 23 for steering is connected. The steering speed reducer 23 is arranged horizontally with respect to the body frame 2. The output shaft 24 of the steering reduction gear 23 is the rotary shaft 2
It is arranged on the opposite side of 1 so as to be in a horizontal state.

Further, the steering speed reducer 23 is provided with a steering auxiliary electric motor 25 arranged horizontally with respect to the vehicle body frame 2.
Are connected, and the steering auxiliary electric motor 25 and the rotation detector 20 are electrically connected.

The output shaft 24 of the steering speed reducer 23 is connected to a connecting joint 27 that is inclined to the right via a connecting joint 26. The connection joint 27 is the connection plate 2
8 is connected to a rotary shaft 29 provided vertically in the steering and drive wheel support 5. The rotating shaft 29 is rotatably supported by a pair of bearings 31 arranged in a housing 30 formed in the steering / driving wheel support 5. Therefore, the rotation direction of the output shaft 24 rotated by the auxiliary steering motor 25 is changed by the connection joint 26, the connection joint 27, and the connection plate 28, and the rotation shaft 29 rotates about the axis of the rotation shaft 29. .

A gear 32 is provided on the rotary shaft 29, and this gear 32 is meshed with a gear (not shown) connected to a drive unit (not shown). Therefore, when the rotary shaft 29 and the gear 32 rotate about the axis of the rotary shaft 29,
A gear of a drive unit (not shown) rotates to steer the steering and driving wheels 3. A battery B for operating the drive motor 6 and the like is arranged in the space 33 formed in the body frame 2.

Next, the structure of the steering mechanism SK will be described. As shown in FIGS. 1 and 5, a support pipe 34 is inserted through the upper surface of the steering post 14. The steering wheel 1 is provided in the support pipe 34.
5, the steering shaft 35 is inserted, and the lower end of the steering shaft 35 is inserted into the steering post 14. The steering shaft 35 is rotatably supported by a bearing 36 arranged in the support pipe 34. A connecting gear 37 is provided at the lower end of the steering shaft 35.

A support pipe 38 is inserted through the steering post 14. An upper end of a connecting shaft 39 is inserted in the support pipe 38, and the connecting shaft 39 is rotatably supported by a bearing 40 arranged in the support pipe 38. A connecting gear 41 is integrally rotatably provided on the connecting shaft 39, and the connecting gear 41 is meshed with the connecting gear 37.

The connecting shaft 39 is connected to the drive transmission shaft 43 via a universal joint 42. Also,
The drive transmission shaft 43 is also connected to the winding pulley 45 via a universal joint 44. The take-up pulley 45 is arranged inside the cab 12 and is rotatably supported on the bottom surface of the cab 12. Therefore, when the steering wheel 15 is rotated, the take-up pulley 45 is rotated in the horizontal direction via the connecting gear 37, the connecting gear 41, and the drive transmission shaft 43. The connection shaft 39, the connection gear 41, the universal joints 42 and 44, and the drive transmission shaft 43 constitute a first transmission mechanism.

As shown in FIGS. 7 and 8, the take-up pulley 4
A square bar-shaped wire bracket 46 is arranged in the central portion of 5 in a direction orthogonal to the winding pulley 45. The wire bracket 46 is fastened and fixed to the winding pulley 45 with two bolts 47. A connecting pin 48 is provided on the upper right side of the wire bracket 46 (upper side in FIG. 8), and a connecting pin 49 is provided on the lower left side of the wire bracket 46 (lower side in FIG. 8).
A wire winding groove 50 is formed on the winding pulley 45 from the upper part of the winding pulley 45 toward the lower part thereof. In this embodiment, the wire winding groove 50 is formed in the counterclockwise direction.

The first and second steering wires 51 and 52 are wound around the wire winding groove 50, respectively. That is, the first steering wire 51 is wound on the wire winding pulley 45 above the wire bracket 46, and the second steering wire 52 is wound on the wire winding pulley 45 below the wire bracket 46. It is rolled. At this time, since the first steering wire 51 is wound from the upper part to the lower part of the winding pulley 45, the steering wire 51 is wound counterclockwise with respect to the winding pulley 45. Then, the fixed collar 51 a provided at the tip of the first steering wire 51 is engaged and fixed to the connection pin 48.

Further, since the second steering wire 52 is wound from the lower part to the upper part of the winding pulley 45, the second steering wire 52 is wound clockwise with respect to the winding pulley 45. . Then, the second steering wire 52
A fixed collar 52a provided at the tip of the is engaged with and fixed to the connection pin 49.

Therefore, the first and second steering wires 5
The intervals of 1, 52 are widely separated. As a result, the first and second steering wires 51 and 52 are not wound around the wire winding groove 50 of the other party.

Further, the first steering wire 51 is wound counterclockwise with respect to the take-up pulley 45, and the second steering wire 52 is wound clockwise with respect to the take-up pulley 45. , For example, when the winding pulley 45 rotates clockwise, the first steering wire 51 is unwound and
The steering wire 52 is wound up by that amount.

Further, as shown in FIGS. 1 and 6, the cab 1
A pair of support pulleys 53 and 54 are provided on the rear side of 2 (on the side where the fork 13 is not provided).
Further, a pair of steering pulleys 5 are provided on the inner mast 8.
5, 56 are rotatably provided.

The first steering wire 51 is stretched over the support pulley 53, then extends upward along the inner mast 8 and is stretched over the steering pulley 55. Similarly, the second steering wire 52 is stretched over the support pulley 54, then extends upward along the inner mast 8, and is stretched over the steering pulley 56. In FIG. 6, the steering pulleys 55 and 56 are seen as one, but they can be rotated individually.

The first and second steering tires 51 and 52, which are respectively wound around the steering pulleys 55 and 56, are connected to both ends of a chain 58 via connection brackets 57, respectively. The chain 58 is stretched around the chain sprocket 22 of the rotary shaft 21 of the rotation detector 20.

Therefore, when the steering wheel 15 is rotated, the rotation is transmitted as follows. That is,
When the steering wheel 15 rotates, the wire winding pulley 45 rotates so as to wind up either the first steering wire 51 or the second steering wire 52. At this time, for example, when the first steering wire 51 is wound up, the second steering wire 52 is unwound from the winding pulley 45 by an amount corresponding to the winding up of the first steering wire 51. Then, one end of the chain 58 is pulled up by that amount via the support pulley 53 and the steering pulley 55, and the other end of the chain 58 is pulled down by that amount.

On the contrary, the same applies when the second steering wire 52 is wound. That is, one end of the steering chain 58 is pulled down in the opposite manner to the above via the support pulley 53 and the steering pulley 55, and the other end of the chain 58 is pulled up accordingly. As a result, with the movement of the chain 58, the chain sprocket 22 and the rotary shaft 21 on which the chain 58 is hung are rotated.

Then, the rotation detector 20 detects the amount of rotation of the rotary shaft 21, and outputs the detection signal to the steering auxiliary electric motor 25. Then, the steering auxiliary electric motor 25 is driven based on the detection signal, and transmits the auxiliary driving force for rotationally driving the steering reduction gear 23 to the steering reduction gear 23.

Therefore, the operator is required to operate the steering wheel 1
When 5 is rotated, an auxiliary driving force corresponding to the rotation is transmitted from the steering auxiliary electric motor 25 to the steering reduction gear 23. In other words, the rotation from the steering wheel 15 is transmitted from the steering auxiliary electric motor 25 so that the operator can rotate the steering wheel 15 with a small rotational force in the steering reduction gear 23, and the output shaft 24 thereof is transmitted. The rotation is output from.

Here, for example, when the piston rod of the lift cylinder 9 extends and the inner mast 8 rises by the length L, the steering pulleys 55, 56 are provided on the inner mast 8 and rise by the length L. Also, the cab 12
The support pulleys 53 and 54 pivotally supported by the cab 12 rise by a length of 2 L because the cab 12 rises by a length of 2 L. Since the chain sprocket 22 is provided on the vehicle body frame 2, it does not move in its place regardless of whether the inner mast 8 is lifted or lowered.

That is, when the steering pulleys 55 and 56 are moved up by the length L, the first and second steering wires 51 and 52 are
Must be increased by a length L on both sides of the steering pulleys 55, 56. At this time, the cab 12
Since the lengths of the steering pulleys 55 and 56 are increased by 2L, the length is compensated. Therefore,
First and second steering wires 51, 52 and chain 58
Does not generate tension due to the rise of the cab 12 or rotate the sprocket 22. Similarly, no tension is generated as the driver's cab 12 descends.

Therefore, irrespective of whether the driver's cab 12 is moved up or down, the turning operation amount of the steering wheel 15 is caused only through the turning of the steering wheel 15 through the first and second steering wires 51 and 52 and the chain 58. Is transmitted to the chain sprocket 22.

Next, the operation of the order picking type forklift 1 configured as described above will be described. When the driver rotationally operates the steering wheel 15 to rotate the steering / driving wheel 3, the steering wheel 15 is provided on the upper surface of the steering post 14, so that a wide space above the steering post 14 is used. Then, the steering wheel 15 can be operated. Further, since the posture of the steering wheel 15 is parallel to the upper surface of the driver's cab 12, the driver can rotate the steering wheel 15 by moving the arm in the front-back direction without moving the arm up and down. be able to.

Therefore, the driver operates the steering wheel 15 by rotating the steering wheel 15 while moving the arm in the fore and aft directions while utilizing the large space, so that the steering operability of the steering wheel 15 becomes comfortable. Moreover,
The rotating operation of the steering wheel 15 can be performed quickly.

Further, according to this embodiment, by transmitting the rotation direction of the drive transmission shaft 43 for transmitting the rotation of the steering wheel 15 to the wire winding pulley 45,
It can be converted in the orthogonal direction. Therefore, the steering post 1 that stands on the fork side 13 of the cab 12
The rotation of the steering wheel 15 provided so as to be parallel to the upper surface portion (upper surface of the cab 12) of the steering wheel 4
Can be transmitted to.

Further, according to the present embodiment, the drive transmission shaft 43, not the chain, is arranged in the steering post 14 to transmit the rotation of the steering wheel 15 to the steering and drive wheels 3. Even if a load contacts or falls on the steering post 14 and vibration or impact is applied, the rotation of the steering wheel 15 can be transmitted to the winding pulley 45.

The support pulleys 53 and 54 have a structure in which the first and second steering wires 51 and 52 are bridged. This structure is on the opposite side of the fork 13 from the rear of the driver's seat 12. Therefore, it is placed in a place where it is not easily affected by the vibration of the load. As a result, it is possible to reliably prevent the first and second steering wires 51 and 52 from being disengaged from the support pulleys 53 and 54 due to the impact or vibration of the load, and to reliably rotate the steering and drive wheels by rotating the steering wheel 15. 3 can be steered.

In the above embodiment, the auxiliary steering electric motor 2 is used.
Although a so-called power steering type vehicle using 5 has been described, it is also applicable to a vehicle without power steering. In particular, in order to make it possible to easily steer a vehicle without power steering with only human power, it is sufficient to increase the reduction ratio of the steering speed reducer. It is necessary to increase the amount of rotation operation. If the chain sprocket connected to the steering wheel is used to hang the chain as in the prior art, a sufficient length for accommodating the chain corresponding to the amount of rotation operation described above is provided and the cab floor and the control box. There is a problem that it cannot be secured between the upper parts. This is a problem that occurs especially when the steering wheel is installed at the front of the driver's vehicle in the traveling direction.
On the other hand, in the present application, by adopting the take-up pulley, it is possible to eliminate the limitation of the space for hanging the chain. [Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described according to 0. The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, in the second embodiment, the rotation of the steering wheel 15 is transmitted between the drive transmission shaft 43 in the first embodiment and the steering pulleys 55 and 56 which are pivotally supported by the inner mast 8. The configuration is different.

The steering shaft 35 of the steering wheel 15 provided on the upper surface of the steering post 14 is rotatably supported by a bearing 36 supported in a support pipe 34. And the steering shaft 35
The lower end of is connected to one end of a transmission drive shaft 43 via a universal joint 42.

The other end of the transmission drive shaft 43 is also connected to the connecting shaft 60 via the universal joint 44. The connecting shaft 60 is rotatably supported by a bearing 61 provided under the steering post 14. A bevel gear 62 is provided at the lower end of the connecting shaft 60.

A driven shaft 63 as a transmission shaft is provided in the driver's cab 12 in the front-back direction as a pair of bearings 64a, 64.
It is rotatably supported by b. Then, at one end of the driven shaft 63, a bevel gear 6 that meshes with the bevel gear 62.
3a is provided, and the other end projects to the rear of the cab 12. A chain sprocket 65 is provided at the other end of the driven shaft 63 protruding rearward of the cab 12. And
Universal joints 42, 44, transmission drive shaft 43,
A second transmission mechanism is constituted by the bevel gears 62 and 63a.

Further, a first chain sprocket 66 is provided above the chain sprocket 65 and behind the cab 12, and is rotatably provided by a bearing 67 provided inside the cab 12. First
Similarly, a second chain sprocket 68 is provided on the front surface of the chain sprocket 66, and the first and second chain sprockets 66, 68 rotate together. The chain sprocket 65 and the first chain sprocket 66 are provided on the same plane behind the driver's seat 12. Then, the chain sprocket 65 and the first chain sprocket 6
An endless chain 69 is stretched between the 6 and.

A guide pulley 7 is provided behind the cab 12 on both lower sides of the second chain sprocket 68.
0, 71 are provided, and the guide pulleys 70, 71 are rotatably supported by bearings 70 a, 71 a provided in the cab 12. The guide pulleys 70 and 71 and the second chain sprocket 68 are arranged on the same plane behind the chain sprocket 65 and the first chain sprocket 66.

One end of the first steering wire 72 is connected to one end of the chain 58 hung on the chain sprocket 22 via a connecting bracket 57a, and the first steering wire 72 extends along the inner mast 8. It extends upward and is stretched around the steering pulley 55. The first operation wire 72 hung on the steering pulley 55 extends downward along the inner mast 8 and hangs on the guide pulley 70. The first steering wire 72 stretched over the guide pulley 70 extends upward along the inner mast 8, and the other end of the first steering wire 72 is connected to one end of a chain 74 via a connecting bracket 73. There is.

The other end of the chain 74 has a connecting bracket 75.
Is connected to one end of the second steering wire 76 via. The second steering wire 76 extends downward along the inner mast 8 and is stretched around the guide pulley 71. The second steering wire 76 extends upward along the inner mast 8 and is stretched around the steering pulley 56. The second steering wire 76 extends downward along the inner mast 8, and the other end of the second steering wire 76 is connected to the other end of the chain 58 via the connecting bracket 57b. Further, the chain sprocket 65, the first and second chain sprockets 66 and 68, and the chains 69 and 74 constitute a drive transmission mechanism.

Accordingly, the rotation of the driven shaft 63 causes the rotation of the chain sprocket 65 to rotate the first and second chain sprockets 66 and 68 via the chain 69. Due to the rotation of the second chain sprocket 68, the chain 74 and the first and second steering wires 72, 7
Since the chain 58 operates via 6, the rotation is transmitted to the chain sprocket 22.

As a result, when the steering wheel 15 is rotated, the rotation is transmitted to the chain sprocket 22, so that the steering and drive wheels 3 can be steered. As described above, also in this embodiment, the steering wheel 15 can be provided on the upper surface of the steering post 14 and in parallel to the upper surface, and the rotating operation of the steering wheel 15 can be smoothly performed.

Also in the second embodiment, the chain sprocket 65 and the first and second chain sprockets 6 are also included.
6, 68 and the guide pulleys 70, 71 move up and down together with the cab 12, so that the first and second steering wires 72, 7
6 is prevented from being loosened or pulled, and the chain sprocket 22 is prevented from rotating freely.

Further, according to this embodiment, the bevel gears 62,
The rotation direction of the steering wheel 15 can be converted to the orthogonal direction by 63a. Therefore, the rotation of the steering wheel 15 provided so as to be parallel to the upper surface of the steering post 14 (upper surface of the cab 12) standing on the fork side 13 of the cab 12 can be transmitted to the steering and drive wheels 3. it can. Moreover, the structure is simpler than that of the above embodiment.

Further, according to the present embodiment, similarly to the above-mentioned embodiments, even if a load comes into contact with or drops on the steering post 14 and vibration or impact is applied, the rotation of the steering wheel is transmitted. There is no stopping it.

Further, according to this embodiment, a special effect for a vehicle without power steering is also obtained as in the above embodiment.

[0066]

As described above in detail, according to the present invention, the operability of the steering wheel is improved, and the steering wheel can be reliably steered by operating the steering wheel.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of an order picking type forklift according to the present invention.

FIG. 2 is a partial perspective view showing a configuration of an upper surface of a steering post.

FIG. 3 is a side view of the order picking type forklift.

FIG. 4 is a perspective view showing a configuration of a cab.

FIG. 5 is a partial side view showing a steering mechanism.

FIG. 6 is an explanatory diagram showing a state in which a steering wire and a chain are bridged.

FIG. 7 is a side view showing a configuration of a winding pulley.

FIG. 8 is a plan view showing the structure of a winding pulley.

FIG. 9 is a partial side view showing another example of the steering mechanism of the order picking type forklift.

FIG. 10 is an explanatory diagram showing a state in which a steering wire and a chain are bridged.

FIG. 11 is a perspective view showing a conventional order picking type forklift.

[Explanation of symbols]

2 ... Body frame, 3 ... Steering and driving wheels, 7, 8 ... Mast, 12 ... Driver's cab, 13 ... Fork, 14 ... Steering post, 15 ... Steering wheel, 39 ... Connection shaft that constitutes the first transmission mechanism, 41 ... Coupling gear constituting first transmission mechanism, 42 ... Universal joint constituting first and second transmission mechanisms, 43 ... Drive transmission shaft constituting first and second transmission mechanisms, 44 ... First And universal joints constituting the second transmission mechanism, 45 ... Winding pulleys, 51, 52 ... Wires, 53, 54 ... Support pulleys, 62, 63a ... Bevel gears constituting the second transmission mechanism, 65 ... Drive transmission Chain sprockets constituting the mechanism, 66 ... First chain sprockets constituting the drive transmission mechanism, 68 ... Second chain sprockets constituting the drive transmission mechanism, 69 Chain constituting the drive transmission mechanism, 70, 71 ... pulley, 74 ... chain constituting the drive transmission mechanism, SS ... steering apparatus, SK ... steering mechanism

Claims (3)

[Claims] 1. An order picking type forklift in which a mast is erected on a body frame and a driver's cab is raised and lowered along the mast, and a steering post is erected on the fork side of the driver's cab, An order-picking forklift with a steering wheel rotatably mounted on the upper surface so that the posture of the steering wheel is substantially parallel to the upper surface of the driver's cab. 2. A steering post is installed on a fork side of a driver's cab which is vertically moved together with a fork along a mast which is erected on a body frame, and a steering wheel is provided on an upper surface of the steering post. Is arranged so as to be substantially parallel to the upper surface of the driver's cab, and the steering mechanism is operated based on the rotating operation of the steering wheel, and the steering wheel provided on the lower side of the vehicle body frame is steered via the steering device. In the order-picking type forklift truck, the steering mechanism is provided in the steering post, and a first transmission mechanism that operates by rotation of a steering wheel; and an operation of the first transmission mechanism provided in the cab The take-up pulley that rotates with the And an order picking type forklift consisting of a pair of wires wound around the take-up pulley so that the winding directions are different from each other. 3. A steering post is installed on the fork side of a driver's cab that rises and lowers integrally with a fork along a mast that is erected on a body frame, and a steering wheel is provided on the upper surface of the steering post. Is arranged so as to be substantially parallel to the upper surface of the driver's cab, and the steering mechanism is operated based on the rotating operation of the steering wheel, and the steering wheel provided on the lower side of the vehicle body frame is steered via the steering device. In the order-picking forklift truck, the steering mechanism is provided in the steering post, and a second transmission mechanism that operates by rotation of a steering wheel; and an operation of the second transmission mechanism that is provided in the cab A transmission shaft that rotates by a vehicle body frame An order-picking forklift including a pulley that suspends a wire that is connected to a steering device that is provided in the vehicle, and a drive transmission mechanism that is connected to the transmission shaft and that rotates the pulley.