JP2017057047A - Lifter device equipped with push-up auxiliary mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifter device equipped with a push-up auxiliary mechanism which comprises a linkage and which can elevate a loading table in association with telescopic motion of a link.SOLUTION: A lifter device comprises a push-up auxiliary mechanism 26 in which a tip 17 of a chain 16 is fixed to a loading table 2, the other end thereof is fixed to a winding shank 22 of a drum 15 which is rotated by a motor 20 with a speed reducer, an intermediate part of the chain 16 is wound on a sprocket 18 which is attached to at least one place of a movable side shaft which constitutes a linkage 3 and wound on the winding shaft 22 of the drum 15 by rotation of the drum 15 thereby elevating the loading table 2, and even from the state that the loading table is lowered, the loading table can be easily elevated.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lifter device including a push-up assist mechanism so that a mounting table moves up and down via a link mechanism.

  FIG. 6 shows a specific example of a conventional general lifter device. A mounting table (b) is provided above the base (b), and a link mechanism is provided between the base (b) and the mounting table (b). (C) and (c) are interposed. The link mechanism (c) has links (d) and (e) crossing each other, and both link mechanisms (c) and (c) facing each other at a predetermined interval are a plurality of connecting rods (f), ( F) It is connected by ...

  By the way, if the base (b) and the connecting rod (f) are connected by a hydraulic cylinder (g) and the piston rod of the hydraulic cylinder (g) is extended, the link mechanisms (c) and (c) are extended. The mounting table (b) can be raised. However, in such a hydraulic lifter device, a hydraulic pump is required and a motor for driving the hydraulic pump is also required, resulting in a high manufacturing cost.

FIG. 7 is a specific example showing another form of a conventional lifter device. Similar to the lifter device shown in FIG. 6, a mounting table (b) is provided above the base (b), and a link mechanism (c), (c) is provided between the base (b) and the mounting table (b). Is intervening. The link mechanism (c) has links (d) and (e) crossing each other, and both link mechanisms (c) and (c) facing each other at a predetermined interval are a plurality of connecting rods (f), ( F) It is connected by ...
By the way, this lifter device does not include a hydraulic cylinder, and uses chains (g) and (g) as means for raising the mounting table (b).

The “meshing chain type lifting device” according to Japanese Patent Laid-Open No. 2014-34467 is the lifter device shown in FIG.
A meshing chain lifting device that makes the size of the meshing chain lifting device compact in the direction in which the first lifting motion unit, the deceleration unit, and the second lifting motion unit are juxtaposed, facilitates centering, and can change the reduction ratio. It is.
That is, a meshing chain type lifting device including a speed reduction unit having a drive motor and a lifting / lowering operation unit having a pair of meshing chains that transmit and receive the power of the speed reduction unit in the lifting / lowering direction. Two units are arranged in parallel on both sides of the unit, and the two lifting operation units are connected to each other by a reduction gear unit and a gear train.

This lifter device does not require a hydraulic pump and the hydraulic cylinder. The mounting table (b) is a structure that is supported by two meshing chains that form a pair. A meshing chain that extends horizontally on the base is wound around a sprocket and pushed up vertically, and the upper end of the meshing chain and the mounting table ( (B) is connected. That is, the mounting table (b) is supported by two meshing chains that form a pair. However, when the height of the mounting table (b) increases, the meshing chain generates a buckling phenomenon. Therefore, the rising height of the mounting table (b) is inevitably suppressed.
"Meshing chain lifting device" according to Japanese Patent Application Laid-Open No. 2014-34467

  As described above, the conventional lifter device has the above-described problems regardless of whether the lifting means of the mounting table is a hydraulic type or a chain type. The problems to be solved by the present invention are these problems, and provide a lifter device including a link mechanism that can increase the height of the mounting table with a simple structure without using hydraulic pressure.

  The lifter device according to the present invention has a base and a mounting table, and the mounting table can be moved up and down via a link mechanism interposed between the base and the base. Although the specific structure of the link mechanism is not limited, the mounting table can be moved up and down as the link mechanism expands and contracts. That is, the tip of one side link constituting the link mechanism is fixed to the base, and the tip of the other side link slides along a guide groove provided in the base. Similarly, the tip of one side link constituting the link mechanism is fixed to the mounting table, and the tip of the other side link slides along a guide groove provided in the mounting table.

The structure of such a basic lifter device is common to a conventional lifter device having a link mechanism.
By the way, the lifter device of the present invention uses a wrapping band body such as a chain as a means for moving the mounting table up and down, and the tip of the wrapping band body is fixed to the mounting table side, so that the link mechanism can be expanded and contracted. It is wound around a sprocket or wheel attached to a place where it can move, and the other end of the winding band is wound around a drum attached to the base.

Here, the number of the sprockets and the like around which the wrapping band body is wound around the sprocket attached to the link mechanism is not limited, and the form of the wrapping band body attached to the link mechanism is arbitrary.
The drum is rotationally driven by a motor with a speed reducer attached to the base, and a winding band can be wound around the drum. Therefore, in the state where the mounting table is lowered, the slider that is attached to and slides on the base and the mounting table is positioned on the front end side, and therefore the winding band is rewound from the drum. When the drum rotates and the winding band is wound, the winding band is pulled, the slider on the base and the mounting table slides, the link mechanism extends, and the mounting table rises. I can do it.

By the way, the lifter device of the present invention is configured so that the mounting table can be moved up and down by the expansion and contraction movement of the link mechanism. Therefore, the tension acting on the winding band is the height from the base of the mounting table. It changes according to (distance). That is, when the height of the mounting table is low, a large tension acts on the winding band and decreases as the height becomes higher.
Therefore, in the present invention, when the link mechanism is contracted and the mounting table is at a low position (bottom dead center), the tension applied to the winding band body is reduced so that the mounting table can be raised with a small tension. An auxiliary mechanism is provided.
However, the specific structure of the push-up assist mechanism is not limited, and is a mechanism that converts the tension acting on the winding band to a force that pushes upward, and when the link mechanism extends and the mounting table rises to some extent, The push-up assist mechanism is released.

  In the link type lifter device according to the present invention, a wrapping band body such as a chain is used as an elevating means of the pedestal, and the pedestal is raised by winding the wrapping band body around a drum rotated by a motor. In this case, tensile stress acts on the wrapping band, and the chain buckling phenomenon does not occur as in the conventional lifter device. Therefore, the mounting table can be raised high, and the rising mounting table can be stabilized.

In addition, a leaf chain or a belt that has been widely used in various fields can be used as the wrapping band, and a specially manufactured member is not necessary, so that the manufacturing cost is reduced.
On the other hand, the lifter device of the present invention is provided with a push-up assist mechanism, so that even when the link mechanism is contracted and the mounting table is at a low position (bottom dead center), relatively small tension (small torque) ) Thus, the mounting table can be raised smoothly.

The Example which shows the external appearance of the lifter apparatus which concerns on this invention. A chain winding form mounted on a link mechanism constituting a lifter device. A specific example of a drum around which a chain is wound. A chain winding form to be mounted on another link mechanism constituting the lifter device. A specific example showing a push-up assist mechanism. Conventional hydraulic lifter device. Conventional chain lifter device.

  FIG. 1 is an embodiment showing the appearance of a lifter device according to the present invention. In FIG. 1, 1 represents a base, 2 represents a mounting table, and 3 represents a link mechanism. The link mechanism 3 includes links 4a, 5a, 4b and 5b. The link 4a and the link 5a are connected by a shaft 6a to form an X shape, and the link 4b and the link 5b are connected by a shaft 6b to form an X shape. It is made. One end of the link 5a is connected to the mounting table 2 by a shaft 7 to become a fixed shaft, and a slider 8 is attached to one end of the link 4a. The slider 8 is a guide groove 9 formed in the mounting table 2. Are loosely fitted.

  One end of the link 4b is connected to the base 1 via a shaft 10 to form a fixed shaft, and a slider 11 is attached to the one end of the link 5b. The slider 11 is loosened in a guide groove 12 formed in the base 1. It is fitted. The link 4 a and the link 5 b are connected by a shaft 13, and the link 5 a and the link 4 b are connected via a shaft 14. The mounting mechanism 2 can be moved up and down by expanding and contracting the link mechanism 3 configured as described above. Here, the shaft 13 is positioned on the same vertical line as the shaft 7 and the shaft 10 even if the link mechanism 3 expands and contracts.

  In the lifter device of the present invention, the link mechanisms 3 and 3 are attached in pairs at a predetermined interval, and the mounting table 2 is always held horizontally by the link mechanisms 3 and 3. By the way, when the link mechanism 3 expands and contracts, the shaft 7 is fixed to the mounting table 2 and the shaft 10 is fixed to the base 1, so that the tip slider 8 of the link 4a and the tip slider 11 of the link 5b are guided by the guide groove. 9 and 12 can be moved.

Therefore, when the mounting table 2 is lowered, the sliders 8 and 11 move to the right end of the guide grooves 9 and 12, and when the mounting table 2 is raised, the sliders 8 and 11 are moved to the guide groove 9. , 12 to the left end.
By the way, a drum 15 that is rotated by a motor 20 with a speed reducer is disposed on the base 1, and the mounting table 2 can be moved up and down by winding or unwinding a chain 16 around the drum 15.

  FIG. 2 shows the movement of the chain 16 as the mounting table 2 moves up and down. FIG. 2A shows a case where the link mechanism 3 is contracted and the mounting table 2 is the lowest, and FIG. When the mounting table 2 is raised, (c) shows a case where the link mechanism 3 is extended greatly and the mounting table 2 is the highest, and (d) shows a side view of (c). The chain 16 is attached to the link mechanism 3 and its tip 17 is connected to the arm of the push-up assist mechanism.

  The middle is wound around the sprockets 18 a, 18 b, 18 c, 18 d, 18 e, is wound around the sprocket 19, and is further wound around the drum 15. Here, the sprocket 18a is coaxial with the slider 8, the sprocket 18b is coaxial with the shaft 6a, the sprocket 18c is coaxial with the shaft 14, the sprocket 18d is coaxial with the shaft 6b, The sprocket 18e is pivotally supported coaxially with the slider 11.

  The sprocket 19 is attached to the base 1, and the drum 15 can be driven to rotate by a motor 20 with a speed reducer. In the lifter device shown in FIG. 1, the drums 15, 15... Are arranged at four locations, and four chains 16, 16. The structure is wound around 15.

  2A shows a state where the chain 16 is wound when the mounting table 2 is lowered and positioned at the bottom dead center, and FIG. 2C shows a winding state of the chain 16 when the mounting table 2 is lifted. When the mounting table 2 is raised, the chain 16 is wound around the drum 15. Conversely, when the mounting table 2 is lowered, the chain 16 is rewound from the drum 15.

  FIG. 3 shows the drum 15 around which the chain 16 is wound. The drum 15 is attached to a shaft 21, and has a wound shaft portion 22 and flanges 23, 23 having increased outer diameters on both sides thereof. A step 24 is formed on the outer periphery of the winding shaft portion 22 to connect the tip of the chain 16, and the chain 16 is connected by a stop pin 25 provided at the site of the step 24, and the drum 15 is moved in the direction of the arrow. If rotating, the chain 16 can be wound around the winding shaft 22.

Here, the chain 16 wound around the winding shaft portion 22 is restrained by the flanges 23 on both sides, and can be wound on the wound chain 16 in an overlapping manner.
As shown in FIG. 1, four chains 16, 16,... Are used for the lifter device, and the drums 15, 15,. In addition, even tension is applied when the chains 16, 16.

  FIG. 2A shows the case where the mounting table 2 is lowered and is located at the bottom dead center. If the drums 15, 15... 16, 16... Are wound around the wound shafts 22, 22... Of the drums 15, 15..., And as a result, the sprockets 18 a and 18 e move and loosely fit into the guide grooves 12 of the base 1. The slider 11 is slid, and the slider 8 loosely fitted in the guide groove 9 of the mounting table 2 is also slid to approach the fixed shafts 10 and 7 side.

Since the link mechanism 3 is configured, the sprocket 18c attached to the shaft 14, the sprocket 18b attached to the shaft 6a, and the sprocket 18d attached to the shaft 6b also move simultaneously. The link mechanism 3 extends as shown in FIG. 2 (c), and the mounting table 2 rises.
When the drum 15 is rotated by the motor 20 with a speed reducer to raise the mounting table 2, a large tension is applied to the chain 16 when the mounting table 2 is at the bottom dead center shown in FIG. And the tension | tensile_strength which acts on this chain 16 becomes small gradually as the mounting base 2 raises and becomes high. That is, since the links 4a, 4b, 5a, 5b are tilted at the bottom dead center position, the mounting table 2 cannot be pushed upward unless the chain 16 is pulled with a large tension.

By the way, the load torque acting on the motor 20 with a speed reducer is relaxed by the amount of the winding radius of the chain 16 wound around the winding shaft portion 22 at first. When the drum 15 rotates once, the winding radius of the chain 16 increases. However, since the tension acting on the chain 16 decreases as the mounting table 2 rises, the load on the motor 20 with a speed reducer becomes extremely large. There is nothing.
If the mounting table 2 stops at a predetermined height, the clutch works to prevent the drums 15, 15... From rotating. Of course, a special safety device can be attached so that the mounting table 2 raised to a predetermined position does not fall freely.

FIG. 4 shows the operation of the chain 16 attached to the lifter device having the X-shaped link mechanism 3. (A) is when the link mechanism 3 is contracted and the mounting table 2 is lowest, (b) is when the link mechanism 3 is slightly extended and the mounting table 2 is raised, and (c) is when the link mechanism 3 is greatly expanded. The case where the mounting table 2 is highest is shown, and (d) shows a side view of (c). The chain 16 is attached to the link mechanism 3, and its tip is connected to the arm of the push-up assist mechanism 26.
The basic structure and operation are the same as those of the lifter device shown in FIG. 2. When the drum 15 is rotated by the motor 20 with a reduction gear, the chain 16 is wound around the winding shaft portion 22 of the drum 15. The mounting table 2 rises.

  Here, the chain 16 attached to the link mechanism 3 of the lifter device is not particularly limited, but a chain called a leaf chain is generally suitable. That is, a leaf chain is a chain used for a general forklift, and has a structure in which a plurality of link plates are arranged at one pitch, and link plates of each pitch are connected by pins. Therefore, the leaf chain can be easily wound without being displaced on the winding shaft portion 22 of the drum 15.

Of course, in the present invention, the belt 16 is not limited to the chain 16 and may be a belt-like member that can be bent or bent. In the case of a belt, a pulley is used instead of the sprocket, and the belt can be wound around the pulley to expand and contract the link mechanism 3.
Alternatively, only the portion wound around the winding shaft portion 22 may be a leaf chain, and the other portion may be a power transmission roller chain.

By the way, the winding form of the chain 16 wound around the link mechanism 3 is not limited as long as the chain 16 is wound around the drum 15 so that the chain 16 can be pulled and the link mechanism 3 can be extended.
In the lifter device of the present invention, when the link mechanism 3 is in a contracted state (when it is located at the bottom dead center), the lifting assist is provided to reduce the tension acting on the chain 16 when the mounting table 2 is pushed up. The mechanism is installed.

  FIG. 5 is a specific example showing the push-up assist mechanism 26. A shaft 27 is provided below the mounting table 2 in parallel with the mounting table 2, and the shaft 27 is supported by bearings 28, 28 attached to the mounting table 2 (see FIG. 2). The A arm 29 and the B arm 30 extend outward from the shaft 27 so that the crossing angle is approximately 90 °. The chain 16 is connected to the tip of the A arm 29, and the tip of the B arm 30 is connected. The roller 31 is pivotally supported so that it can rotate.

  FIG. 5A shows a case where the link mechanism shown in FIG. 2A is contracted and the mounting table 2 is lowered, and FIG. 5B shows that the mounting table 2 is slightly moved as shown in FIG. 2B. This is the case when it rises. If the drum 15 rotates and tension is applied to the chain 16 when the mounting table 2 is raised, the A arm 29 is pulled by the chain 16 and turns, and the shaft 27 rotates. As a result, the B arm 30 attached to the same shaft 27 turns in the same direction, as shown in FIG. 5B.

The roller 31 attached to the tip of the B arm 30 is in contact with the link 4a, and if the B arm 30 turns, the link 27 is pressed and the shaft 27 attached to the B arm 30 is attached by the reaction force. Pushing force works.
In this way, when the push-up assist mechanism 26 is operated, it becomes a force for pushing up the mounting table 2 by the tension of the chain 16, and the mounting table 2 can be raised by a relatively small chain tension.

As shown in FIG. 2 (c), the link mechanism 3 extends greatly and the mounting table 2 rises, and the roller 31 moves away from the link 4a. .
Here, the specific structure of the push-up assist mechanism 26 is not limited, and the push-up assist mechanism 26 can be converted to a direction in which the mounting table 2 is raised by the tension of the chain 16.
In the case of the push-up assist mechanism 26 shown in FIG. 5, the shaft 27 is rotated by the tension of the chain 16, and the mounting table 2 is pushed up by the B arm 30 attached to the shaft 27.
For example, a cam can be attached to the shaft 27, and the mounting table 2 can be pushed up by a cam that rotates with the tension of the chain 16.

1 base 2 mounting table 3 link mechanism 4 link 5 link 6 axis 7 axis 8 slider 9 guide groove
10 axes
11 Slider
12 Guide groove
13 axes
14 axes
15 drums
16 chain
17 Tip
18 sprocket
19 Sprocket
20 Motor with reduction gear
21 axes
22 Wrapped shaft
23 brim
24 steps
25 Stop pin
26 Push-up assist mechanism
27 Shaft
28 bearings
29 A-arm
30 B-arm
31 Laura

Claims (3)

In a lifter device provided with a link mechanism, and the mounting table can be moved up and down as the link mechanism expands and contracts, the tip of a wrapping band such as a chain is fixed to the mounting table side, and the other end is equipped with a speed reducer The drum is rotated by a motor and fixed to the winding shaft of the drum, and the intermediate portion of the winding band is wound around a sprocket or wheel attached to at least one of the movable side shafts constituting the link mechanism. The link mechanism is extended and the mounting table is lifted by winding the winding band around the winding shaft of the drum by rotating,
In order to reduce the tension acting on the winding band when the link mechanism contracts and the mounting table rises from the bottom dead center, a lifting assist mechanism that converts the tension into a lifting force is provided. A lifter device having a pushing-up assist mechanism. The lifter device provided with the pushing-up auxiliary mechanism according to claim 1, wherein a leaf chain or a belt is used as the winding band. As the push-up assist mechanism, a shaft is provided in parallel on the lower side of the mounting table, and an A arm that connects the tip of the winding band is attached to the shaft, and the tip is a roller that contacts the link of the link mechanism A lifter device comprising the push-up assist mechanism according to claim 1 or 2, wherein a B-arm that pivotally supports the shaft is attached.