JPH0357020B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to a lifting device such as a lift platform, which is attached to a mast so as to be able to rise and fall freely, and is driven up and down by a drive mechanism such as a winch. The present invention relates to a construction lifting device configured to.

<Prior art> Conventional construction lifting equipment uses a transport platform (so-called transport platform), which is driven by an electric motor or the like and has a platform that can be raised and lowered, for loading and unloading cargo. When transporting cargo with a pallet mounted on the pallet, first slide the loading platform of the transportation cart under the pallet, raise the loading platform, secure the pallet to the transportation truck, and then After the lift platform is stopped at the specified floor and the lift platform is stopped at the specified floor, a tread is installed across the lift platform and the building, and the transport trolley is driven to transport the pallet and the cargo to the building side. later,
The loading platform of the transportation truck is lowered to place and support the pallet on the building side, and the transportation truck is returned from under the pallet to the lift loading platform to complete the loading of the cargo.

On the other hand, when unloading items such as junk from the building side, the loading platform of the transport trolley is placed under the loaded pallet, and then the loading platform is raised to secure the pallet to the transport trolley. In this state, the transport trolley is driven to transport the pallet and the cargo to the lift bed, and then the transport trolley is placed and supported on the lift bed side, and the transport trolley is returned from under the pallet to the lift bed. Remove the treadle to complete loading the cargo.

<Problems to be solved by the invention> However, according to such a conventional configuration,
In order to be able to carry large loads on a transport trolley, as well as having drive wheels, the loading platform of the transport trolley cannot be lowered, so the loading platform is hidden under the pallet. To,
It is not possible to use pallets with a low height below the floor, and only predetermined pallets can be used, which is inconvenient in practice.

In addition, in order to drive the transport trolley between the lift bed side and the building side, the treadle must be constructed so as not to hinder the movement of the transport trolley, and it is also necessary to carry a large amount of weight when moving. In order to support the load, the treads needed to be sturdy, and the treads and their mounting configuration had the disadvantage of a low degree of freedom in design.

Therefore, as disclosed in Japanese Utility Model Application Publication No. 59-22285, an automatic loading/unloading device is provided on the car floor, which loads and unloads luggage by displacing the loading/unloading support surface using an advancing/retracting member between the landing and the car. In addition, the top surface of the automatic loading/unloading device is configured to be able to be raised and lowered by an X-link mechanism between a position elevated from the top surface of the car floor and a position flat on the top surface of the car floor, so that the support surface of the cargo can be moved up and down. Some are configured to be displaced in the directional and horizontal directions.

However, in the case of this conventional example, the horizontal displacement of the cargo support surface is performed by the telescopic displacement of a multi-stage telescoping member such as a hydraulic cylinder, and the cargo support surface is moved in the vertical direction. The X-link mechanism is configured such that the base end of one of the links constituting the X-link mechanism is displaced by an expansion and contraction mechanism such as a hydraulic cylinder, and the displacement is performed in the horizontal and vertical directions of the load supporting surface. When trying to change the stroke to , the operating source itself, such as a hydraulic cylinder, must be changed, which has the disadvantage of being expensive.

In addition, there were restrictions on the size of the basket itself, making it difficult to incorporate a basket with a large stroke, which also had the disadvantage of not allowing a large stroke.

In addition, when the load support surface is moved toward the landing with the load placed on it, the load of the load tends to cause deflection in each advancing and retracting member, and heavy loads such as construction materials are not transported easily. However, there were drawbacks that made it difficult to apply it to construction lifting equipment.

Furthermore, when the load is lowered to the other side with the support surface displaced toward the landing, the components that make up the support surface of the load collide with the landing, which not only damages the support surface components, but also damages the impact. There was a risk that the force would spread to the basket and damage the automatic loading/unloading device itself.

The present invention was developed in view of these circumstances, and is capable of transporting even heavy loads.
Furthermore, both the vertical and horizontal strokes can be changed at low cost, and both the vertical and horizontal strokes can be increased relative to the stroke of the hydraulic cylinder. The purpose is to avoid damage due to descent and improve stability.

<Means for Solving the Problems> In order to achieve the above object, the construction lifting device of the present invention is a construction lifting device in which a lifting device main body is attached to a mast so as to be able to move up and down by driving. A support bracket is provided on a guide rail provided on the lifting device main body so as to be able to rise and fall, and the support bracket and a lifting hydraulic cylinder provided on the lifting device main body are interlocked and connected via a lifting crank mechanism to the support bracket. , the intermediate vertical link is interlocked and connected via the first upper link and the first lower link, and the support bracket, the first upper link, the first lower link, and the intermediate vertical link form a parallel four-link mechanism on the base end side. The tip vertical link, which connects the fork for carrying cargo, is interlocked and connected to the intermediate vertical link via the second upper link and the second lower link, and the tip vertical link, the second upper link, and the second lower link are connected to each other. The link and the intermediate vertical link constitute a parallel four-link mechanism on the distal end side, and the cable connected to the lower part of the distal vertical link is connected to the support bracket by detouring from the upper part to the lower part of the intermediate vertical link, and then connected to the first lower link. and a horizontal movement hydraulic cylinder provided on the support bracket side are interlocked and connected via a horizontal movement crank mechanism.

<Function> According to the above configuration, the fork is placed and fixed on the lifting device main body in a state where it is hidden under the pallet loaded with cargo, and in that state, it ascends to a predetermined floor,
After stopping the lifting device main body at a predetermined floor, the support bracket is raised by a predetermined amount by driving the lifting hydraulic cylinder, and then by driving the horizontal movement hydraulic cylinder, the base end side and The fork is displaced in the horizontal direction by the tension action on each of the four parallel link mechanisms on the tip side and the tension action of the cable, and then the support bracket is slightly lowered by driving the lifting hydraulic cylinder. The pallet is placed and supported on the building side, the fork is pulled out from under the pallet by driving the horizontal movement hydraulic cylinder, and both hydraulic cylinders are operated in the opposite direction to the above to move the fork to the horizontal support bracket. The fork is moved to the side and lowered to return the fork to the main body of the lifting device, thereby allowing the load to be lifted. On the other hand, the fork is displaced horizontally to get under the pallet loaded with cargo, and the fork is driven and displaced both vertically and horizontally to transport the pallet onto the main body of the lifting device. You can unload your belongings from the building side.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

Fig. 1 is a perspective view of the main parts of an embodiment of the building lifting device of the present invention, Fig. 2 is an overall schematic front view, Fig. 3 is an overall schematic side view, and Fig. 4 is an overview of the main parts. FIG. 5 is an enlarged partial cutaway side view and a partially cutaway enlarged plan view of the main part.

In these figures, 1 is a mast erected at a predetermined location around a building A under construction, and is constructed by assembling a steel frame.

A pair of left and right guide rails 2, 2 are attached to the mast 1, and the guide rails 2, 2
A lift platform 3 as a main body of the lifting device is attached so as to be able to move up and down along the construction lift, and the construction lift is configured to move up and down various kinds of cargo such as construction materials.

At the rear of the lift platform 3, as shown in FIGS. 1 and 5, a pair of left and right vertical frames 4, 4 are provided, and rollers 5 are rotatably mounted on shafts above and below each of the vertical frames 4, 4. The lift platform 3 is configured to move up and down along the guide rails 2, 2 with the rollers 5... being engaged with the guide rails 2, 2 from the outside and positioned in the front, rear, right and left directions. ing.

As shown in the perspective view of the wire wrapping configuration in FIG. 6, a winch 8 as a drive mechanism is interlocked and connected to the lift platform 3 via a hanging wire 7 wrapped around a sheave 6. The winch 8 is driven to move the lift platform 3 up and down.

Further, a counterweight 9 is interlocked and connected to the hanging wire 7 to balance the weight with the lift platform 3, and is configured so that a winch 8 with a small capacity can be used and can be driven up and down at high speed.

In the figure, 10 is an overload safety device.

1, 4, and 5 on the outside of each of the vertical frames 4, 4, which are erected on the left and right rear sides of the lift platform 3.
As shown in each figure, guide rails 12, 12, which are made up of a pair of channel materials facing each other, are fixed upright, and the guide rail 1
2 and 12 respectively, a pair of upper and lower rollers 13 and 1
A support bracket 14 is attached via 3.

The left and right support brackets 14, 14 are each
The side view shape is approximately L-shaped, and the tips of the arm portions extending forward are connected by an H steel 15 to form left and right support brackets 14, 14.
are integrated.

A lifting hydraulic cylinder 1 is installed at the bottom of the lift platform 3.
6 is provided, and a lifting hydraulic cylinder 16 is interlocked and connected to a lever portion 17a that is integrally and rotatably connected to the rotating body 17.
An arm 18 is integrally and rotatably connected to each end of the arm 18, and an elongated hole 19 is formed at the tip side of each of the arms 18, 18. By connecting with a pin through the elongated hole 19, the arm 18 is connected to the lifting hydraulic cylinder 16. The support bracket 14 is interlocked and connected, and the support bracket 14 is driven up and down by the driving expansion and contraction of the lifting hydraulic cylinder 16. The rotating body 17, the lever portion 17a, and the arm 18,
18 constitutes a lifting crank mechanism.

Each support bracket 14, 14 has two
A bending/extending mechanism 22 for parallel movement is connected, which is configured by connecting a set of four parallel link mechanisms 20 and 21 to each other.

The parallel four-link mechanism 20 on the proximal end side includes a support bracket 14, a first upper link 23 and a first lower link 24 whose one end side is pivotally connected to the support bracket 14, and both links 23, 24, respectively. It is composed of an intermediate vertical link 25 whose tips are pivotally connected.

On the other hand, the parallel four-link mechanism 21 on the tip side includes the intermediate vertical link 25, a second upper link 26 and a second lower link 27 whose one end is pivotally connected to the intermediate vertical link 25, and both links 26. ,2
7 Tip vertical link 2 with each tip pivotally connected
It consists of 8.

The end vertical links 28 of the left and right bending and stretching mechanisms 22, 22 are connected to a pair of upper and lower support members 30, 3.
1 are integrally connected.

Fulcrum portion 3 to which the second lower link 27 is pivotally connected
A chain 33, which is an example of a cable, is connected between the support bracket 14 and the support bracket 14 at an intermediate location in the vertical direction. It is wound around a pulley 34 and a second pulley 36 attached to a fulcrum part 35 that pivotally connects the first and second lower rings 24 and 27, and the first As the upper link 23 and the first lower link 24 each swing up and down with respect to the support bracket 14, the second upper link 26 and the second lower link 27 each move in the parallel four-link mechanism 21 on the distal end side. , the first upper link 23 and the lower link 2 with respect to the intermediate vertical link 25
4, and is configured to swing up and down in the opposite direction to each other, thereby displacing the end vertical link 28 in the horizontal direction.

H connecting the left and right support brackets 14, 14
A hydraulic cylinder 37 for horizontal movement is connected to the steel 15, and the hydraulic cylinder 37 for horizontal movement is interlocked and connected to a lever portion 38a which is integrally and rotatably connected to the rotating body 38. An arm 40 is integrally and rotatably connected to each other, and an elongated hole 39 is formed at the tip end of each of the arms 40, 40. By connecting with a pin through the elongated hole 39, a hydraulic cylinder 37 for horizontal movement is connected to the arm 40.
An arm portion 24a integrally connected downward from the support bracket 14 side end of the first lower link 24 is interlocked and connected, and by the drive expansion and contraction of the horizontal movement hydraulic cylinder 37, support as shown in FIG. It is configured to be driven and displaced between a state in which it protrudes away from the bracket 14 and a state in which it retracts toward the side close to the support bracket 14 as shown in the side view of the main part in FIG. The rotating body 38, lever portion 38a, and arms 40, 40 constitute a crank mechanism for horizontal movement.

A pair of left and right forks 41, 41 are attached to the pair of upper and lower support members 30, 31, respectively, so that the attachment interval can be changed.

That is, as shown in the partially cutaway side view of the main part of FIG. is fixed by tightening a screw 44 in a state in which the lower end thereof is in contact with a mounting protrusion 43 attached to the support member 31 on the lower side.

The left and right center portions of the floor surface of the lift platform 3 are recessed, and when the lift platform 3 is retired to the side and the support bracket 14 is lowered, each of the forks 41, 41 is inserted into the recess 45 as shown in FIG.
The load, pallets, etc. placed on the forks 41, 41 are directly supported by the floor surface of the lift platform 3, and when the lift platform 3 is driven up and down, the load of the cargo, pallets, etc. is transferred to the forks. 41, 41, so that its durability can be improved.

As shown in FIGS. 1 and 4, on the front end side of the upper surface of the lift platform 3, a tread plate 47 for closing the gap with the floor 46 on the building A side is installed over its entire width around the horizontal axis. This tread plate 47 is rotatably provided in the lift platform 3, and the tread plate hydraulic cylinder 48 incorporated in the lift platform 3 is interlocked and connected via a reversing arm 49 and a link 50. Therefore, it is configured to be able to change between an upwardly standing position and a horizontal position spanning the floor 46 on the building A side.

In addition, on the front surface of the lift platform 3, as shown in the perspective views of the main parts showing the elevating structure of the door in FIGS. 7 and 9, guides 51 are installed on the left and right sides,
A door 52 is provided along each of the guides 51 so as to be able to slide up and down.
1 and 51 are suspended and supported by a wire 54 wound around an attached pulley 53 at the upper end of each.

A hydraulic cylinder 5 for the door is installed at the bottom of the lift platform 3.
A pair of left and right wires 56, 56 connected to this door hydraulic cylinder 55 and a movable pulley 57 interposed between the wires 54, 54 connected to the door 52, respectively, are connected. As the hydraulic cylinder 55 is driven to expand and contract, both movable pulleys 57 and 5 are shortened.
7 toward each other, thereby raising the door 52 above the floor of the lift platform 3 with a stroke twice the displacement of the movable pulley 57;
It is configured to descend below the floor using its own weight.

Each of the lifting hydraulic cylinder 16, the horizontal movement hydraulic cylinder 37, the tread hydraulic cylinder 48, and the door hydraulic cylinder 55 is connected to the lift platform 3.
It is configured to be driven by the supply and discharge of pressure oil from a hydraulic unit 58 provided at the lift platform 3, and to control the operations of electromagnetic valves and the like via a control box 59 erected on the lift platform 3.

In the above embodiment, two sets of parallel quadruple link mechanisms 2
0, 21, a chain 33, and one horizontal movement hydraulic cylinder 37, each of the forks 41, 41 can be driven and displaced in the horizontal direction,
In addition to simplifying its configuration, it is also possible to
Even if the forks 41, 41 unexpectedly collide with another object when descending, the slack in the chain 33 allows each of the forks 41, 41 to swing upward and escape, thereby preventing the forks 41, 41 from being damaged. It has advantages.

<Effects of the Invention> As explained above, according to the present invention, the support bracket provided on the guide rail so as to be movable up and down includes a first upper link, a first lower link, an intermediate vertical link, and a second upper link. The distal end vertical link connecting the forks is interlocked and connected via the second lower link and the cable, and the support bracket, the first upper link, the first lower link, and the intermediate vertical link connect the four parallel links on the base end side. It constitutes a link mechanism, and includes an intermediate vertical link, a second upper link, and a second
The lower link and the tip vertical link constitute a parallel four-link mechanism on the tip side, and the tension of the first and second upper links and the first and second lower links that constitute each of the two parallel four-link mechanisms. Since the fork is supported by the force and the tension of the rope, the force applied to each component is dispersed,
It can effectively transport heavy loads such as construction materials.

In addition, a lifting crank mechanism is interposed between the lifting hydraulic cylinder for vertical displacement and the support bracket, and a horizontal movement hydraulic cylinder for horizontal displacement and a parallel quadruple link on the base end side. Since the horizontal movement crank mechanism is interposed between the first lower link that constitutes the mechanism, even when changing the vertical and horizontal strokes of the fork, the same hydraulic pressure can be maintained by changing the respective connection positions. It can be easily changed by simply adjusting the lever ratio of the members constituting the crank mechanism while using a cylinder, and there is no need to convert to a hydraulic cylinder with a different stroke, making it inexpensive.

In addition, as mentioned above, since the vertical and horizontal strokes of the fork can be set using the lever ratio, the stroke of the fork displacement can be increased relative to the operating strokes of the lifting hydraulic cylinder and the horizontal movement hydraulic cylinder. ,
It is convenient in practice.

Moreover, since the parallel four-link mechanism on the distal end side is operated using the tension of the cable, even if
Even if the lifting device is unexpectedly lowered with the fork extended and the fork collides with another object such as the floor, the cable will loosen and the parallel four-link mechanism on the tip side will escape upwards, causing the fork and the tip side to It is possible to avoid not only damage to the parallel four-link mechanism but also impact force spreading to the parallel four-link mechanism on the proximal end side, the support bracket, etc., and improve safety.

[Brief explanation of drawings]

The drawings show an embodiment of the construction lifting device according to the present invention, in which FIG. 1 is a perspective view of the main parts, FIG. 2 is a schematic front view of the whole, FIG. 3 is a schematic side view of the whole, and FIG. 5 is an enlarged partially cutaway side view of the main part, FIG. 5 is a partially cutaway enlarged plan view of the main part, FIG. 6 is a perspective view showing the hanging structure of the hanging wire, and FIG.
FIG. 8 is an enlarged partially cut-away side view of the main part of the fork with the fork retracted; FIG. 8 is a partially cut-away enlarged side view showing the fork attachment part; FIG. 9 is a schematic perspective view showing the elevating configuration of the door. . DESCRIPTION OF SYMBOLS 1... Mast, 2... Guide rail, 3... Lift platform as the main body of the lifting device, 14... Support bracket, 16... Hydraulic cylinder for lifting, 20...
... Parallel four-link mechanism on the base end side, 21... Parallel four-link mechanism on the distal side, 23... First upper link, 24... First lower link, 25... Middle vertical link, 26... 2nd Atsupah Link, 27...
...Second lower link, 28...Tip vertical link, 3
3... Chain as a rope, 37... Hydraulic cylinder for horizontal movement, 41... Fork.

Claims (1)

[Claims] 1. In a construction lifting device in which a lifting device main body is attached to a mast so that it can be driven up and down, a support bracket is provided on a guide rail provided on the lifting device main body so as to be able to go up and down, and between the support bracket and the lifting device main body side. A lifting hydraulic cylinder provided therein is interlocked and connected via a lifting crank mechanism, an intermediate vertical link is interlocked and connected to the support bracket via a first upper link and a first lower link, and the support bracket and the The first upper link, the first lower link, and the intermediate vertical link constitute a parallel four-link mechanism on the base end side, and the distal end vertical link connecting the fork for carrying cargo is connected to the second upper link and the intermediate vertical link. is interlocked and connected to the intermediate vertical link via two lower links, and the distal end vertical link, the second upper link, the second lower link, and the intermediate vertical link constitute a parallel four-link mechanism on the distal end side. , a cable connected to the lower part of the tip vertical link is connected to the support bracket by detouring the upper part to the lower part of the intermediate vertical link, and a hydraulic cylinder for horizontal movement is provided on the first lower link and the support bracket side. A construction lifting device characterized in that these are interlocked and connected via a horizontal movement crank mechanism.