JP2006264965A - Lifter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an elastic body from being damaged while reducing burden applied to a lifting drive means by the expansion/contraction type elastic body. <P>SOLUTION: The lifter device is provided with a baggage receiving base 2 liftably supported by an expansion/contraction link mechanism 1 having a pair of links 4, 5 pivotally connected to an X shape; a lifting drive means 3 for lifting the baggage receiving base 2 between an upper limit position and a lower limit position by expanding/contracting the expansion/contraction link mechanism 1; and the expansion/contraction type elastic body 16 elastically expanded/contracted so as to urge the baggage receiving base 2 to an ascending side in at least a lower limit side range of a lifting range of the baggage receiving base 2 and elastically contracted by descending of the baggage receiving base 2. An expansion/contraction body 19 for pressing the baggage receiving base for movably guiding/supporting the movable body 18 for pressing the baggage receiving base in a vertical direction by a base body 17 installed in an attitude along the vertical direction is provided. The expansion/contraction type elastic body 16 is provided in such a state that the movable body 18 is urged to an upper side and in such a state that it is expandably/contractably guided/retained to the expansion/contraction body 19. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a load receiving base that is supported by a telescopic link mechanism in which a pair of links are pivotally connected in an X shape, and the telescopic link mechanism is extended and retracted to move the load receiving base to an upper limit position and a lower limit position. Elevating drive means for elevating between, and a telescopic type that elastically stretches so as to urge the load receiving base to the upward side in at least a lower limit range of the lifting range of the load receiving base and elastically contracts by lowering the load receiving base The present invention relates to a lifter device provided with an elastic body.

The lifter device as described above lifts and lowers the object to be lifted by lifting and lowering the load receiving table by extending or contracting the telescopic link mechanism by the lifting drive means.
When the elevating drive means extends the telescopic link mechanism to raise the load receiving table from the lower limit position, the telescopic elastic body attaches the load receiving table to the rising side in the lower limit range from the lower limit position to the set height. By elastically expanding so as to urge, the elastic body assists the lifting of the load receiving table from the lower limit position, thereby reducing the burden on the lifting drive means.

As such a lifter device, the inside of a cylindrical body conventionally installed in a posture along the vertical direction on the installation surface with one end of the elastic elastic body fixed to the installation surface on which the lifter device is installed In the lower limit side range, the elastic body is elastically stretched, so that the elastic body presses the load receiving table upward (see, for example, Patent Document 1).
In Patent Document 1, when the load receiving table rises above the lower limit side range, the elastic body elastically stretches so as to protrude upward from the cylindrical body. The elastic body is pressed, and the elastic body is elastically contracted so as to fit in the cylindrical body.

Japanese Patent Laid-Open No. 10-218583

In the above conventional lifter device, when the load receiving table rises above the lower limit side range, the elastic body elastically stretches so as to protrude upward from the cylindrical body. When shrinking, the direction in which the elastic body is elastically reduced is determined only by the direction in which the telescopic elastic body is pressed by the load receiving platform.
However, for example, it is difficult to precisely regulate the direction in which the elastic base is pressed by the load receiving base, such as when an unbalanced load is applied to the load receiving base by the lifting object, so the elastic body is elastically reduced in an appropriate direction. I can't. Therefore, the elastic body is not properly accommodated in the cylindrical body, causing the elastic body to buckle and possibly damaging the elastic body.

  The present invention has been made paying attention to such a point, and an object of the present invention is to provide a lifter capable of preventing damage to the elastic body while reducing the load applied to the lifting and lowering driving means by the elastic elastic body. The point is to provide a device.

In order to achieve this object, a first characteristic configuration of a lifter device according to the present invention includes: a load receiving base supported by a telescopic link mechanism in which a pair of links are pivotally connected in an X shape; Elevating drive means for elevating and lowering the load receiving table between an upper limit position and a lower limit position by extending and contracting the link mechanism, and urging the load receiving table upward in at least the lower limit side range of the lifting range of the load receiving table In the lifter device provided with a stretchable elastic body that is elastically stretched and elastically contracted by lowering the load receiving table,
There is provided a telescopic body for pressing the cradle for supporting and moving the movable body for pressing the cradle in a vertical direction on a base body installed in a vertical direction, and the telescopic elastic body is movable. The body is provided in a state in which the body is urged upward and is guided and held in a stretchable manner by the stretchable body.

That is, when the elevating drive means extends the telescopic link mechanism to raise the load receiving platform from the lower limit position, at least in the lower limit side range, the elastic body biases the movable body upward. The movable body moves upward while elastically extending while being guided. Due to the upward movement of the movable body, the movable body can press the load receiving table upward and bias the load receiving table upward.
Further, when the telescopic link mechanism is contracted by the elevating drive means to lower the load receiving table to the lower limit position, the movable body is pressed downward by the load receiving table due to the lowering of the load receiving table. Move down. Due to the downward movement of the movable body, the elastic body is elastically reduced while being guided by the stretchable body.

In this way, when raising the load receiving table from the lower limit position, at least in the lower limit side range, the elastic elastic body elastically stretches, whereby the load receiving table can be urged upward, and When the load receiving table is lowered to the lower limit position, the contraction direction of the elastic elastic body can be guided by the elastic body to reduce the elastic body while preventing the elastic body from buckling.
Accordingly, it has become possible to provide a lifter device that can prevent damage to the elastic body while reducing the burden on the lifting and lowering driving means by the elastic elastic body.

  A second characteristic configuration of the lifter device according to the present invention is configured such that the expansion body restricts the lowering limit of the movable body by the base so as to restrict a lower limit position of the load receiving base. In the point.

That is, when the load receiving platform is lowered to the lower limit position, the base body comes into contact with the movable body and restricts the lowering limit of the movable body. Therefore, the expansion and contraction body also serves as a regulating means for regulating the lower limit position of the load receiving platform. Can do.
Therefore, it is possible to regulate the lower limit position of the load receiving platform without simplifying the configuration without newly providing a regulating means.

  According to a third feature of the lifter device of the present invention, the movable body is guided and supported by the base body so as to be movable in the vertical direction, and the pressure is connected to the main body portion so that the vertical position can be adjusted. It is in the point comprised with an action part.

That is, when the main body portion moves in the vertical direction with respect to the base body, the pressing action portion presses the load receiving table upward, or the pressing action portion is pressed downward by the load receiving table.
And in constructing the movable body, since it can be connected to the main body part while adjusting the vertical position of the pressing action part, the vertical position of the pressing action part can be easily arranged at an appropriate position. .

  According to a fourth characteristic configuration of the lifter device according to the present invention, the base is formed in a cylindrical shape, and the movable body is guided and supported so as to be movable in the vertical direction while being fitted in the base. The stretchable elastic body is formed between the upper end portion of the base body and a receiving portion provided on a portion of the movable body that protrudes above the base body, in a state of surrounding the movable body. This is because it is composed of coil springs.

The telescopic elastic body is arranged in a state of surrounding the rod-shaped movable body between the upper end portion of the cylindrical base body and the receiving portion provided at the portion of the rod-shaped movable body that protrudes above the base body. Therefore, for example, the size of the base body and the movable body can be reduced compared with the case where the coil spring is disposed inside the cylindrical base body, and the movable body is attached to the upper side by the coil spring. You can
Therefore, while the coil spring as the elastic elastic body can be properly arranged, the elastic body can be made as small as possible, so that the elastic body can be made compact.

  According to a fifth characteristic configuration of the lifter device according to the present invention, the cargo cradle is configured to include a cargo bed portion that receives one end side of the object to be lifted and a cargo bed portion that receives the other end side. The telescopic link mechanism, the elevating drive means, and the telescopic elastic body are provided separately.

That is, the object to be lifted can be moved up and down in a horizontal or substantially horizontal posture by synchronizing and lifting the pair of bed parts of the bed part that receives one end side of the lifting object and the bed part that receives the other end side. it can.
Then, for each of the pair of bed parts, it is possible to similarly assist the rise from the lower limit position of the bed by the elastic extension of the stretchable elastic body, and the pair of bed parts can be easily raised in synchronization. .

An embodiment of a lifter device according to the present invention will be described with reference to the drawings.
This lifter device is provided, for example, at a loading / unloading location of an automatic warehouse, and is used for raising and lowering the article as an object to be moved up and down using the article that enters the automatic warehouse or the article that is carried out from the automatic warehouse.

As shown in FIG. 1 which is a plan view and FIG. 2 which is a side view in the A direction of FIG. 1, the load receiving platform 2 for placing and supporting the lifting object B receives one end side of the lifting object. A first cargo bed portion 2a and a second cargo bed portion 2b that receives the other end side are provided.
In each of the first cargo bed portion 2a and the second cargo bed portion 2b, the telescopic link mechanism 1 that supports the cargo tray 2 so that it can be moved up and down, and the telescopic link mechanism 1 are expanded and contracted to move the cargo tray 2 to the upper limit position and the lower limit position. Ascending / descending drive means 3 for raising and lowering between them is provided separately.
Each of the first load receiving portion 2a and the second load receiving portion 2b includes an elevating portion 2A that is raised and lowered by the telescopic link mechanism 1 and a load receiving portion 2B that supports the elevating object B. The load receiving portion 2B are arranged one by one at both ends in the longitudinal direction of the lifting part 2A, and the four corners of the lifting object B are placed and supported by the four load receiving parts 2B.

  3 and 4 show the first cargo bed portion 2a of the first cargo bed portion 2a and the second cargo bed portion 2b, and FIGS. 3 (a) and 4 (a) are plan views. 3 (B) and FIG. 4 (B) are side views. 3 shows the time when the first cargo bed portion 2a is located at the lower limit position, and FIG. 4 shows the time when the first cargo bed portion 2a is located at the upper limit position.

  Hereinafter, the telescopic link mechanism 1 and the lifting / lowering driving means 3 will be described. Since the first cargo bed portion 2a and the second cargo bed portion 2b have the same configuration, the first cargo bed portion is based on FIGS. 3 and 4. Only 2a will be described.

The telescopic link mechanism 1 has a pair of links 4 and 5 of a first link 4 and a second link 5 that are pivotally connected in an X shape on the side closer to the lifting object B with the lifting drive means 3 interposed therebetween. A total of two sets, one set and one set on the far side, are provided, and these two sets of links 4, 5 support the first cargo bed portion 2 a so as to be movable up and down with respect to the base 6.
As shown in FIGS. 3 (B) and 4 (B), the upper end 4a of the first link 4 is pivotally connected to the first cargo bed portion 2a, and the lower end 4b of the first link 4 is a first guide. The roller 7 is slidably provided on the first guide 8 formed on the base 6 so as to be slidably connected to the base 6 in the horizontal direction.
The lower end 5a of the second link 5 is pivotally connected to the base 6, and the upper end 5b slides the second guide roller 9 to the second guide 10 formed in the first loading part 2a. By being provided movably, it is slidably coupled to the first loading platform portion 2a in the horizontal direction.

As shown in FIGS. 3 (a) and 4 (a), the elevating drive means 3 is configured so that two sets of links 4 and 5 are reciprocated in the horizontal direction to reciprocate two sets of links. The links 4 and 5 are configured to extend and contract in a synchronized state.
The connecting body 11 is formed in a rod shaft shape for connecting the lower ends 4b of the first links 4 in the two sets of links 4 and 5, and the central portion 11a in the longitudinal direction thereof is screwed onto the ball screw 12 extending in the horizontal direction. Are combined.
An electric motor 13 that rotates the ball screw 12 is provided. The electric motor 13 rotates the ball screw 12 in the forward direction or the reverse direction, thereby reciprocating the connecting body 11 in the horizontal direction.
Thus, the raising / lowering drive means 3 is comprised from the coupling body 11, the ball screw, the electric motor 13, etc. FIG.

The movement by the elevating drive means 3 will be described. As shown in FIG. 3, when the load receiving platform 2 is located at the lower limit position, the ball screw 12 is rotationally driven by the electric motor 13 to move the connecting body 11 in the horizontal direction. Move to. Then, both of the two sets of links 4 and 5 are caused to slide at the first guide 8 by the first guide roller 7 and slide at the second guide 10 by the second guide roller 9, thereby lower end portions of the first link 4. 4b and the upper end 5b of the second link 5 slide in the horizontal direction.
In this manner, the lift drive means 3 extends the pair of links 4 and 5 by rotationally driving the ball screw 12 with the electric motor 13, and the load receiving platform 2 reaches the upper limit position as shown in FIG. Until then, the extension operation of the pair of links 4 and 5 is continued.

  Further, when the load receiving platform 2 is lowered from the upper limit position shown in FIG. 4 to the lower limit position shown in FIG. 3, the elevating drive means 3 rotates the ball screw 12 in the reverse direction by the electric motor 13, thereby The links 4 and 5 are reduced.

As shown in FIG. 1 and FIG. 2, an upper limit position detection sensor 14 that detects that the load receiving platform 2 is located at the upper limit position by detecting the position of the connecting body 11 in the horizontal direction, and the load receiving platform 2 is the lower limit. A lower limit position detection sensor 15 for detecting the position is provided.
And the raising / lowering drive means 3 detects presence of the coupling body 11 by the upper limit position detection sensor 14, as shown in FIG. Is stopped and the cargo receiving platform 2 is stopped at the upper limit position.
Further, the raising / lowering driving means 3 operates the electric motor 13 by detecting the presence of the connecting body 11 by the lower limit position detection sensor 15 as shown in FIG. Stop and stop the cradle 2 at the lower limit position.

Thus, by operating the raising / lowering driving means 3 provided on the first cargo bed part 2a and the raising / lowering driving means 3 provided on the second cargo bed part 2b in a synchronized state, the first cargo bed part 2a and The second cargo bed portion 2b is configured to move up and down in a synchronized state.
Basically, the load receiving platform 2 is moved up and down by the operation of the lifting drive means 3, but when the load receiving platform 2 is raised from the lower limit position, auxiliary means K for assisting the raising of the load receiving platform 2 is provided. It has been.

Hereinafter, the auxiliary means K will be described.
As shown in FIG. 1, the auxiliary means K are provided separately for the first cargo bed portion 2a and the second cargo bed portion 2b, and in each of the cargo bed portions 2a and 2b, as shown in FIG. 3 and FIG. A total of two are provided at both ends in the longitudinal direction with the mechanism 1 and the lifting drive means 3 sandwiched therebetween.

As shown in FIG. 5, the auxiliary means K elastically expands and contracts so as to bias the load receiving table 2 upward in the lower limit range from the lower limit position to the set height, and elastically contracts when the load receiving table 2 is lowered. Type elastic body 16 and a load receiving base pressing expansion / contraction body 19 that supports and supports a load receiving base pressing movable body 18 in a vertical direction by a base body 17 installed in a vertical orientation. ing.
The stretchable body 19 is provided on the base 6, and the stretchable elastic body 16 is provided in a state in which the movable body 18 is biased upward and is guided and held by the stretchable body 19 so as to be stretchable. It has been.
Incidentally, FIG. 5 is an enlarged view in which the telescopic link mechanism 1 and the elevating drive means 3 are omitted in FIGS. 3 (b) and 4 (b), and FIG. FIG. 5 (B) shows the time when the load receiving platform 2 is located at a set height that is the upper end of the lower limit side range.

In other words, the base body 17 of the expansion / contraction body 19 is formed in a cylindrical shape, and the movable body 18 of the expansion / contraction body 19 is in a rod shape that is guided and supported so as to be movable in the vertical direction while being fitted in the base body 17. Is formed.
The stretchable elastic body 16 is disposed in a state of surrounding the movable body 18 between the upper end portion 17a of the base body 17 and the receiving portion 20 provided in a portion of the movable body 18 protruding above the base body 17. The coil spring 16a is made up of.

When raising the load receiving platform 2 from the lower limit position, as shown in FIG. 5 (a), in the lower limit side range, the elastic body 16 urges the movable body 18 upward. The movable body 18 moves upward while elastically extending while being guided. Due to the upward movement of the movable body 18, the movable body 18 can press the lifting / lowering part 2 </ b> A of the load receiving platform 2 upward and bias the load receiving platform 2 upward.
Further, when the load receiving platform 2 is lowered to the lower limit position, as shown in FIG. 5 (b), the movable body 18 is pressed downward by the elevating part 2A of the load receiving platform 2 as the load receiving platform 2 is lowered. Then, the movable body 18 moves downward. Due to the downward movement of the movable body 18, the elastic body 16 is elastically reduced while being guided by the stretchable body 19, so that the reduction direction of the elastic body 16 can be guided by the stretchable body 19. Can be prevented from buckling.

The expansion body 19 is configured to restrict the lowering limit of the movable body 18 by the base body 17 so as to restrict the lower limit position of the load receiving platform 2.
That is, as shown in FIG. 5A, when the load receiving platform 2 reaches the lower limit position, the lower end portion of the movable body 18 comes into contact with the lower end portion of the base body 17, and further lowering of the movable body 18 is restricted. The lower limit position of the cargo receiving platform 2 is regulated.

The movable body 18 includes a main body portion 18a that is guided and supported by the base body 17 so as to be movable in the vertical direction, and a pressing action portion 18b that is connected to the main body portion 18a so that the vertical position can be adjusted. ing.
That is, the pressing portion 18b is constituted by a bolt, and the vertical position of the pressing portion 18b is adjusted by screwing the bolt into the main body portion 18a. Can be connected to an appropriate vertical position so that the movable body 18 is pressed downward by the elevating part 2A of the load receiving platform 2.

[Another embodiment]
(1) In the above embodiment, the expansion and contraction body 19 restricts the lowering limit of the movable body 18 by the base body 17 in order to restrict the lower limit position of the load receiving platform 2, but without providing such a configuration, A stopper for regulating the lower limit position of the load receiving platform 2 can be newly provided.

(2) In the above-described embodiment, the movable body 18 includes the pressing action portion 18b that is connected to the main body portion 18a so that the vertical position can be freely adjusted. The movable body 18 can also be configured.

(3) In the above-described embodiment, as the elastic elastic body 16, the upper end portion 17 a of the cylindrical base body 17 and the receiving portion 20 provided on the portion of the rod-shaped movable body 18 that protrudes above the base body 17. A coil spring 16a disposed in a state surrounding the rod-shaped movable body 18 is provided between the lower end portion of the rod-shaped movable body 18 and the lower end portion of the cylindrical base body 17, for example. It is also possible to carry out by arranging a coil spring, which is a telescopic elastic body 16, inside the cylindrical base body 17.

(4) In the above embodiment, the base body 17 is formed in a cylindrical shape, and the movable body 18 is formed in a rod shape that is guided and supported so as to be movable in the vertical direction while being fitted in the base body 17. On the contrary, the base body 17 may be formed in a rod shape, and the movable body 18 may be formed in a cylindrical shape that is guided and supported so as to be movable in the vertical direction while being externally fitted to the base body 17.

(5) In the above embodiment, the load receiving platform 2 is divided into the first loading platform portion 2a that receives one end side of the lifting object B and the second loading platform portion 2b that receives the other end side of the lifting object B. For example, it is also possible to make the load receiving platform 2 into a shape that entirely receives the lower surface portion of the lifting object B, and the shape of the load receiving stand 2 can be appropriately changed.

(6) In the above embodiment, two auxiliary means K are provided for each of the first cargo bed portion 2a and the second cargo bed portion 2b. However, the number and arrangement positions of the auxiliary means K can be changed as appropriate. is there.

(7) In the above embodiment, the lifter device used in the loading / unloading location of the automatic warehouse is illustrated, but the applicable range of the lifter device according to the present invention is limited to that used in the loading / unloading location of the automatic warehouse. It can be applied to various places where objects to be lifted / lowered exist.

Top view of lifter device Side view in the direction of A in FIG. Plan view and side view of part of lifter device Plan view and side view of part of lifter device Enlarged view of main parts of lifter device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Telescopic link mechanism 2 Load receiving base 2a, 2b Loading base part 3 Lifting drive means 4,5 Link 16 Telescopic elastic body 16a Coil spring 17 Base body 18 Movable body 18a Main body part 18b Press action part 19 Telescopic body 20 Receiving part

Claims (5)

A load receiving base supported by a telescopic link mechanism in which a pair of links are pivotally connected in an X-shape, and a telescopic link mechanism, and the telescopic link mechanism is expanded and contracted to raise and lower the load receiving base between an upper limit position and a lower limit position. An elevating drive means to be extended, and an elastic elastic body that elastically stretches so as to bias the load receiving table to the rising side in at least a lower limit range of the lifting range of the load receiving table and elastically reduces by lowering the load receiving table. The lifter device provided with
A telescopic body for pressing the receiving platform is provided to support the movable body for pressing the receiving platform in a vertically movable manner on a base installed in a posture along the vertical direction,
A lifter device in which the telescopic elastic body is provided in a state in which the movable body is urged upward and is guided and held by the telescopic body in a telescopic manner.   The lifter device according to claim 1, wherein the stretchable body is configured to restrict the lowering limit of the movable body by the base so as to restrict a lower limit position of the load receiving table.   2. The movable body includes a main body part that is guided and supported by the base body so as to be movable in the vertical direction, and a pressing action part that is connected to the main body part so that the vertical position can be adjusted. Or the lifter apparatus of 2. The base is formed in a cylindrical shape, and the movable body is formed in a rod shape that is guided and supported so as to be movable in the vertical direction while being fitted in the base.
A coil spring in which the telescopic elastic body is disposed between the upper end portion of the base body and a receiving portion provided on a portion of the movable body that protrudes above the base body so as to surround the movable body. The lifter device according to any one of claims 1 to 3, comprising: The cargo cradle is configured to include a cargo bed portion that receives one end side of the lifting object and a cargo bed portion that receives the other end side,
The lifter apparatus as described in any one of Claims 1-4 with which the said expansion-contraction link mechanism, the said raising / lowering drive means, and the said expansion-contraction type elastic body are each provided with respect to those bed parts.

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