JPH04333498A - Transport carriage - Google Patents

Abstract

PURPOSE:To give the device general purpose adaptability and restrain tilt of a vehicle body to insure safety by connecting either of a first and second running frames provided with wheels to a lateral frame so as to rotationally move around the axis in the right and left direction, and providing forks capable of displacing up and down and right and left by the use of a drive mechanism. CONSTITUTION:A second lateral frame 3b is outward fitted to a first lateral frame 3a of square pipe provided on a first running frame 1 so as to expand or contract due to sliding, and the opposed space can be changed. A second running frame 2 is joined to the second lateral frame 3b so as to enable to rotationally move around the axis in the right and left direction of a vehicle body, and even when reinforcement or the like is stepped with driving wheels 4 or caster wheels 5, the first and the second frames 1,2 are relatively inclined and moved individually rotationally to climb over it, and hence tilt of the vehicle body is prevented. Further, with an electric power cylinder 27 for elevatable movement and a fork projecting and retreating power cylinder 35, the forks 14, 14 can be driven to move in the up and down direction of the body and in the back and forth direction.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to carrying a load lifted by a construction lift or the like to a predetermined location within the floor on each floor of a construction site such as a medium-to-high-rise building, so-called horizontal transportation. This invention relates to a transport vehicle used for.

0002

[Prior Art] Conventionally, for transporting the above-mentioned loads, a forklift is lifted onto each floor and the lifted load is transported to a predetermined location by the forklift, or the lifted load is transported to a predetermined location by a forklift. There was a type that lifted the loaded cargo to a specified floor, lowered the cart, and then connected it to a tow truck that had been hoisted to each floor in advance, and transported the load to the specified location by towing the truck. .

However, in the former case, in order to increase the loading capacity, it is necessary to increase the weight of the counterbalance weight, and as a result, the ground contact pressure from the front wheels increases when loading the load, causing damage to the floor etc. On the other hand, a large amount of weight, which is the weight of the vehicle plus the weight of the load, is applied locally,
This has the disadvantage of lowering safety, such as the risk of damaging floor slabs, etc.

[0004] Furthermore, when trying to transport a long object such as reinforcing steel, the traveling direction is perpendicular to the longitudinal direction of the long object, making it difficult to change direction and poor maneuverability, reducing work efficiency. There was a drawback. In particular, at construction sites, lifts that lift loads are often installed using elevator shafts, and there are cases where the entrance to the elevator hall is too narrow to carry the load. Unavoidably, this had the disadvantage of further reducing work efficiency and increasing labor costs, making it uneconomical.

On the other hand, in the latter case, which uses a towing vehicle,
This method has the disadvantage that it requires a lot of manpower to unload the cargo on the trolley, making it uneconomical due to high labor costs. Furthermore, since the trolley is connected to the towing vehicle, the overall length of the vehicle body becomes longer in the traveling direction, making it difficult to change direction, resulting in poor maneuverability and reduced workability.

[0006] Therefore, the inventors of the present invention first connected a first running frame and a second running frame that are parallel to each other with a horizontal frame, and created a connection between the first running frame and the second running frame. A load holding space is formed in the first and second
We have proposed a transport vehicle in which a fork is provided on each traveling frame of the vehicle so that it can be driven in and out of the holding space and can be driven and displaced in the vertical direction.
(See Publication No. 96).

[0007] This allows the load to be held from both sides by a plurality of forks, and the weight of the load is distributed over three or more wheels, thereby reducing the ground contact pressure caused by the wheels and increasing the ground contact pressure. In order to improve safety by avoiding damage to floor slabs, etc., even with long objects,
It can be transported in the same direction as its longitudinal direction and can travel as long as it has a width equal to the distance between the first and second traveling frames, making it easier to maneuver and improving work efficiency. That's what I do.

[0008]

[Problems to be Solved by the Invention] However, in the above-mentioned transport vehicle, the left and right traveling frames are connected by a pair of front and rear horizontal frames, so although it is suitable for transporting long objects that are long in the longitudinal direction of the vehicle body, Loads that are short but tall in the longitudinal direction of the vehicle cannot be transported because the horizontal frames get in the way; Damaged objects are scattered around, and if the wheels run over these damaged objects, the entire vehicle body may tilt and the load may be accidentally released and fall.
There was still room for improvement.

The present invention has been made in view of the above circumstances, and is capable of handling not only long objects that are long in the longitudinal direction of the vehicle body, but also cargo that is short but tall in the longitudinal direction of the vehicle body. In addition to improving versatility by making it transportable,
To simplify the configuration and to suppress tilting of a vehicle body caused by wheels running onto other objects to enable safe transport travel.

0010

[Means for Solving the Problems] In order to achieve the above-mentioned object, the transportation vehicle of the present invention includes a first running frame that is narrow and long in the longitudinal direction of the vehicle body and that is equipped with a plurality of wheels; The upper parts of the rear end sides of the second running frames, which are narrow and long in the longitudinal direction of the vehicle body and each have one wheel, are connected by a horizontal frame so that a U-shaped space is formed in a plan view. At the same time, at least one of the first and second traveling frames is connected to the horizontal frame so as to be rotatable around an axis in the left-right direction of the vehicle body, and the first
Each of the second running frames is provided with a fork that can be moved in and out of the U-shaped space and also movable in the vertical direction, and a horizontal drive mechanism that drives and displaces the fork in the vertical direction. A vertical drive mechanism for driving displacement is provided.

[0011]

[Operation] According to the structure of the carrier of the present invention, the first and second traveling frames move the load lifted by a construction lift or the like so as to straddle the load, and position the load within the U-shaped space. , by moving the fork horizontally, it plunges under the load, and by moving the fork vertically, it lifts the load, transports the load while holding it in the U-shaped space, and then moves it to a predetermined position. When transported to a location, the fork can be pulled out and unloaded by performing the reverse operation as described above.

[0012] Furthermore, when one wheel of the first and second running frames runs onto an obstacle such as a cable, reinforcing steel, or formwork material, the running frame on that wheel side may fall over the other running frame. The vehicle rotates around the axis in the left-right direction of the vehicle, allowing the vehicle to be transported while traveling with little inclination of the entire vehicle.

[0013]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall side view of the transport vehicle, FIG. 2 is an overall plan view, and FIG. 3 is an overall rear view. In these figures, 1 indicates a first traveling frame, and 2 indicates a second traveling frame. The upper parts of the first and second running frames 1 and 2 on the rear end side in the longitudinal direction of the vehicle body are connected by a horizontal frame 3 so as to form a U-shaped space in a plan view. It is configured to be able to transport both long objects that are long in the direction of the vehicle and objects that are short but tall in the longitudinal direction of the vehicle body.

In each of the first and second running frames 1 and 2, a drive wheel 4 is attached to the rear end side in the longitudinal direction of the vehicle body at the lower part thereof, and a caster wheel 5 is attached to the front end side in the longitudinal direction of the vehicle body.

The drive wheel 4 is rotatably held by a wheel holder 6, as shown in the enlarged sectional view of FIG.
A recess 7 for accommodating a motor is formed in the hub portion of the motor support case 8 , and a motor support case 8 is mounted and supported on the wheel holder 6 so as to be located within the recess 7 . The traveling electric motor 9 and the driving wheels 4 are interlocked and connected via a gear type reduction mechanism 10.

A support shaft 11 integral with the wheel holder 6 is attached to each of the first and second traveling frames 1 and 2 so as to be rotatable around a vertical axis.
The upper end and the steering electric motor 12, which can be forward and reverse, are interlocked and connected via a gear transmission mechanism 13, and the running direction of the vehicle body can be changed, and the vehicle body can be rotated in the front-rear direction and in the left-right direction. It is configured so that the posture can be changed between a side-to-side posture and a side-to-side posture.

As shown in the cross-sectional views of FIGS. 5 and 6, the horizontal frame 3 has a cylindrical axis attached to a square cylindrical first horizontal frame 3a that is integrally attached to the first traveling frame 1. It is constructed by fitting a square cylindrical second horizontal frame 3b that can be expanded and contracted by sliding in the center direction, and is driven by changing the driving wheel 4 to a width-shifting position in which it rotates in the left-right direction of the vehicle body. The configuration is such that the facing interval between the first and second running frames 1 and 2 can be changed.

With this configuration, the first and second traveling frames 1 and 2 can be brought close together to make it compact when lifting and transporting the transport vehicle itself using a construction lift or the like, or when storing it. In addition, depending on the size of the load such as materials to be transported, the fork 14 described later can be easily lifted and transported.
... can be fully inserted under the load to obtain a stable conveyance condition.

Further, a lock pin 15 is provided in the first horizontal frame 3a so as to be able to move in and out in a direction perpendicular to the axial direction of the cylinder.
are provided in the second horizontal frame 3b, and lock holes 16 are formed at predetermined intervals, such as a 10 cm pitch, in the direction of the cylinder axis, and lock holes 16 are provided in the first horizontal frame 3a. The lock cylinder 17 and the lock pin 15 are interlocked and connected via a bell crank 18, and are configured to be fixed with the opposing distance between the first and second traveling frames 1 and 2 adjusted to a predetermined distance. ing.

The second running frame 2 is rotatably provided on a second horizontal frame 3a around an axis in the left-right direction of the vehicle body, and as shown in the overall schematic perspective view of FIG. 1 and the second running frame 2 are relatively inclined,
When the drive wheels 4 and caster wheels 5 run by stepping on cables, reinforcing bars, etc., the first running frame 1 and the second running frame 2 rotate individually to overcome them, thereby preventing the vehicle body from tilting significantly. It is constructed so that it can run in a stable state and prevent large impact forces from being applied to the load being transported.

As shown in the partially omitted side view of FIG. 8 and the rear view of the main parts of FIG. 9, each of the first and second traveling frames 1 and 2 has a lifting guide in its front and rear vertical frame portions. On the other hand, roller support frames 21a and 21b are provided at both longitudinal ends of a fork support frame 20, which is provided with two forks 14 and 14 at a predetermined interval in the longitudinal direction of the vehicle body. Guide rollers 22 attached to 21a, 21b are provided so as to act on the lifting guide 19.

Chains 23a and 23b are connected to the upper ends of the roller support frames 21a and 21b, and both chains 23
a, 23b are wound around guide sheaves 24 along the frame and connected to one main chain 25.

As shown in the plan view of the main part of FIG. 10, the intermediate frame 26 of each of the first and second traveling frames 1 and 2 is provided with an electric lifting power cylinder 27, and its movable rod Guide sheaves 29, 29 are provided at the tip of the intermediate frame 26, and an intermediate guide sheave 30 is provided at one end of the intermediate frame 26, and the main chain 25 is connected from the intermediate guide sheave 30 to the guide sheave 29,
29, and the tip of the main chain 25 is connected and fixed to an intermediate frame 26.

With this configuration, by expanding and contracting the movable rod 28, both ends of the fork support frame 20 in the longitudinal direction are suspended and pulled, and the forks 14, 14 are raised, while the main chain 25 and the chains 23a, 2
3b is loosened and the fork 14, 14 is adjusted according to its own weight and the weight of the load.
A vertical drive mechanism is configured to lower the.

A slack detection device 31 is provided to act on a midway point of each of the chains 23a and 23b. This slack detection device 31 has a roller 33 attached to the tip of a rotating arm 32, and a spring (not shown) that always urges the rotating arm 32 to be displaced to the active side. Chain 23a,
A limit switch 34 is provided so as to be activated when the rotation arm 32 rotates due to loosening of the rotation arm 23b.

When the rotating arm 32 acts on the limit switch 34, the lifting power cylinder 27 is stopped, and when lowering, the forks 14, 14
If the fork 14 collides with another object, the fork 14,
14 is stopped, and the loaded load can be prevented from being accidentally released and dropped.

The fork support frame 20 includes a roller support frame 21a, as shown in a rear view of the main part in FIG. 11, a partially cutaway plan view of the main part in FIG. 12, and a schematic plan view for explaining the operation in FIG. , 21b so as to be slidable in the left-right direction of the vehicle body, and a movable body 36 is provided within the fork support frame 20 such that it can be driven and moved in the front-rear direction of the vehicle body by a power cylinder 35 for moving the fork in and out.

A first guide sheave 37a is provided on the space S side of the fork support frame 20 on the rear end side in the longitudinal direction of the vehicle body, and a second guide sheave 37b is provided on the opposite side. A third guide sheave 37c is provided on the S side, and a fourth guide sheave 37d is provided on the opposite side.

A first chain 38 whose one end is connected to the space S side of the roller support frame 21a on the rear side in the longitudinal direction of the vehicle body.
a is wound around the first guide sheave 37a, passes through the movable body 36, and is wound around the fourth guide sheave 37d, and the space S of the roller support frame 21b is located at the front side in the longitudinal direction of the vehicle body. connected to the far side.

[0031] A second roller support frame 21a having one end connected to the rear side of the roller support frame 21a in the longitudinal direction of the vehicle body is connected to the side far from the space S.
A chain 38b is wound around the second guide sheave 37b, and its tip is connected to the movable body 36, while one end is connected to the roller support frame 21 on the front side in the longitudinal direction of the vehicle body.
A third chain 38c connected to the space S side of b is wound around the third guide sheave 37c, and its tip is connected to the movable body 36.

With the above configuration, by driving and displacing the movable body 36 in the longitudinal direction of the vehicle body, the fork support frame 2
A horizontal drive mechanism is configured to move the forks 14, 14 in and out of the space S by displacing the forks 14 in the left-right direction of the vehicle body.

[0033] According to the present invention, the horizontal frame 3 may not be configured to be extendable or contractible, but may be configured as a single frame.

[0034]

[Effects of the Invention] According to the carrier of the present invention, a plurality of forks hold a load from both sides, and the weight of the load is distributed among three or more wheels, thereby reducing the ground pressure caused by the wheels. In addition, there is no need to increase the weight of counterbalance weights to increase the loading capacity, and damage to floor slabs, etc. caused by increased ground pressure can be avoided and safety can be improved. However, even if the object is long in the longitudinal direction of the vehicle body, it is transported in the same direction as its longitudinal direction, so there is a width equal to the distance between the first and second traveling frames. Not only can it run easily and improve work efficiency by making it easier to maneuver, but it can also be used when carrying short but tall loads in the U-shaped space without being obstructed by the horizontal frame. It has become possible to transport it by putting it in a container, improving versatility.

Moreover, since the first running frame and the second running frame are connected by one horizontal frame, the structure can be simplified.

Furthermore, it is possible to suppress the inclination of the vehicle body caused by the wheels running on damaging objects such as cables, reinforcing bars, and formwork materials, and it is possible to suppress the accidental release and fall of loads caused by running onto such objects, thereby increasing safety. Now you can improve your performance even further.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of a transport vehicle.

FIG. 2 is an overall plan view.

FIG. 3 is an overall rear view.

FIG. 4 is an enlarged sectional view of the drive wheel.

FIG. 5 is a sectional view taken along line AA in FIG. 3;

6 is a sectional view taken along line BB in FIG. 5. FIG.

FIG. 7 is an overall schematic perspective view.

FIG. 8 is a partially omitted overall side view.

FIG. 9 is a rear view of main parts.

FIG. 10 is a sectional view taken along line CC in FIG. 8;

FIG. 11 is a rear view of main parts.

FIG. 12 is a partially cutaway plan view of the main part.

FIG. 13 is a schematic plan view for explaining the operation.

[Explanation of symbols]

1...First running frame 2...Second running frame 3...Horizontal frame 4...Drive wheel 5...Caster wheels 14...Fork 27...Power cylinder for lifting 35...Power cylinder for fork ejection/extraction S...U-shaped space

Claims (1)

[Claims] [Claim 1] A vehicle body comprising a first running frame that is narrow and long in the longitudinal direction of the vehicle body and has a plurality of wheels, and a second running frame that is narrow and long in the longitudinal direction of the vehicle body and has at least one wheel. The upper parts on the rear end sides in the longitudinal direction are connected by a horizontal frame in a state where a U-shaped space is formed in a plan view, and at least one of the first and second running frames is connected to the horizontal frame on the left and right sides of the vehicle body. A fork is provided on each of the first and second traveling frames so as to be movable in and out of the U-shaped space and movable in the vertical direction. The conveyance vehicle is further provided with a horizontal drive mechanism for driving and displacing the fork in the horizontal direction and a vertical drive mechanism for driving and displacing the fork in the vertical direction.