JPH08133687A - Lifting device - Google Patents

Abstract

PURPOSE: To provide a lift device, which can stably support a load without generating wobble. CONSTITUTION: In a lifting device provided with a vertical telescopic lift device 3 on a base 2, the lift device 3 is formed of to telescopic cylinders 30, which is formed by continuously providing plural square cylindrical bodies 31A-31E having the polygonal cross section so as to be extended and shrunken in the vertical direction by an extending and shrinking device, with the predetermined space. An energizing member 12, which energizes both square cylindrical bodies to any one of the directions for separating from each other and for coming close to each other, is interposed between each square cylindrical bodies 31B-31D, 31B-31D positioned on the same stage of the second stage from the lower of both the telescopic cylinders 30, 30 or upper stages so as to eliminate the generation of looseness between each square cylindrical bodies of the telescopic cylinder 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for supporting and vertically moving a heavy object.

[0002]

2. Description of the Related Art As an example of a conventional lifting device of this type,
There is a bridge-type lifting device as shown in FIGS. The conventional lifting device shown in FIGS. 11 to 13 is a self-propelled traveling vehicle 2 which serves as a base on a pair of traveling rails (one set of two) 1 and 1 which are laid at right and left intervals. , 2 are mounted on the traveling carriages 2 and 2, and vertically movable type lift devices 3 and 3 are provided on the traveling carriages 2 and 2, respectively, and a beam unit 5 is installed between upper ends of the lift devices 3 and 3. There is.

The traveling vehicles 2 and 2 are made to synchronously travel on the traveling rails 1 and 1 at a constant speed by a traveling drive device (hydraulic motor) 10. Left and right lift devices 3,
3 has three telescopic cylinders 31, 31, 31 respectively. Each of the telescopic cylinders 31 is configured such that a total of four cylinders 31a to 31d are successively connected in a telescopic manner and each of the cylinders 31a to 31d can be vertically expanded and contracted by a hydraulic device (not shown).

The beam unit 5 includes top tables 6 and 6 provided at the upper end of a telescopic cylinder 31 on the left and right sides.
And two front and rear beams 7, 7 which are erected between the respective top tables 6, 6. The uppermost cylinder 31d of each telescopic cylinder 31 has its upper end pivotally attached to the lower surface of the top table 6 by a pin 64. Each of the beams 7 and 7 is provided with hanging hooks 82 and 82 (four in total) at two locations, and the hanging hooks 82 and 82 ...
The heavy wire W can be hung by the wire ropes 83 ,. As the heavy object W to be handled, a considerably large weight (for example, 5
0 to 100 tons).

In this conventional lifting device, left and right traveling rails 1, 1 are laid on both sides of the installation position of the heavy object W, and traveling trolleys 2, 2 and a lifting device 3 are provided on each traveling rail 1, 1. ，
3 and the beam unit 5 are assembled. Then, after connecting the hanging hooks 82, 82 of the beams 7 and 7 and the heavy object W with the wire ropes 83, 83 ,. W
And the traveling drive devices 10 and 10 cause the traveling carriages 2 and 2 to travel along the traveling rails 1 and 1, respectively, so that the heavy object W can be transported to a target position while being suspended. ing.

[0006]

By the way, in the conventional lifting device shown in FIGS. 11 to 13, the left and right lifting devices 3, 3 are used.
Each telescopic cylinder 31, 31 ... Constituting 3 has a plurality of (four) cylinders 31a to 31d continuous in a telescopic manner, and the telescopic cylinder 31 is used as the lift device 3. The thing has a considerable strength (bearing force) against the load in the vertical direction, but the holding force is relatively weak against the shake in the horizontal direction. Therefore, when the heavy object W is suspended (the telescopic cylinders 31, 31, ... Are extended), the cylinders 31b to 31d located at the second stage or higher are likely to be apt to grind, and the beam unit 5 and the suspension unit are suspended. The load (heavy load) W may be horizontally slurred. As described above, if the beam unit 5 and the suspended load W are grappled, there is a problem that the operator is uneasy and the operator feels uneasy.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a lifting device capable of supporting a beam unit and a suspended load in a stable state.

[0008]

The lifting device of the present invention comprises:
The following features are provided as means for solving the above problems.

According to the first aspect of the present invention, in a lifting device in which a vertically expandable / contractible lift device is provided on a base, the lift device has a polygonal cross section and a plurality of rectangular cylinders in a telescopic shape. 2 at a predetermined distance from each other, and each of the rectangular cylinders can be vertically expanded and contracted by an expansion device.
The book is configured using. This lifting device mainly uses one on each of the left and right sides (two in total), and a beam unit is erected between them to be used as a bridge-type lifting device in many cases, but only one lifting device is used. It can also be used in heavy equipment.

The base may be installed at a fixed position, or it may be moved by using a traveling carriage.

It is suitable that the number of the rectangular cylinders used in one telescopic cylinder is about 3 to 6. In addition, each rectangular tube of the telescopic tube,
Normally, a quadrangular cross section is adopted, but a triangular cross section or a pentagonal cross section or more may be adopted. The rectangular tubular body located at the bottom of each telescopic cylinder is fixed on the traveling carriage. A hydraulic cylinder is usually used as an expansion / contraction device for expanding / contracting each rectangular tube. In addition, in this telescopic cylinder,
Although the pad is interposed between the inner and outer rectangular cylinders, a minute gap exists between the rectangular cylinders because the rectangular cylinders expand and contract.

Further, in each of the telescopic cylinders forming a set of two, between the rectangular cylinders located at the same stage of the intermediate step portion, the both rectangular cylinders are attached to each other in either the separating direction or the approaching direction. A biasing member for biasing is interposed. A telescopic cylinder or a telescopic rod can be used as the biasing member. It should be noted that the biasing member may be installed in a tensioned state in order to bias each square tube in the separating direction, and conversely, the biasing member may be installed in a contracted state in order to bias each square tube in the approaching direction. . Also, this biasing member
It may be provided only between an appropriate set of rectangular cylinders located on the same stage of the intermediate stage portion of the telescopic cylinder, or if there are multiple intermediate stage portions, they may be installed at multiple locations for each same stage. May be.

According to the second aspect of the present invention, in the lifting device according to the first aspect, in the lifting device, the two side faces sandwiching one corner of each telescopic cylinder are simultaneously subjected to the biasing action of the biasing member. Are arranged in this way. That is, for example, in the case of a telescopic tube made of a square tube, the two telescopic tubes in the lift device are installed so that the opposing side surfaces thereof are in a non-parallel state (preferably, the angle formed by the opposing side surfaces of each rectangular tubular body is 90 degrees). °
It is good to be about).

[0014]

In the lifting device according to the first aspect of the present invention, the suspended load is connected to the upper structure of the lift device on the base with a wire rope or the like, or the load is placed on the upper structure. It is possible to lift a load by synchronously extending each telescopic tube (one set of two) of the lift device.

At this time, as the lifting device, two telescopic cylinders in which a plurality of rectangular tubular members are telescopically expanded and contracted by the telescopic device are used.
Since they are used as a set, the vertical supporting force is large and the horizontal shaking prevention force is also large.

When a traveling vehicle is used as the base, the traveling vehicle is allowed to travel so that the cargo can be conveyed to a target position together with the lifting device.

In each of the two telescopic cylinders, a plurality of rectangular cylinders are continuous in a telescopic manner. However, in such a structure, a minute gap is generated between the angular cylinders that are superposed inward and outward, which causes rattling. Although it is a cause, since the rectangular tubular bodies located on the same stage of the second stage and above are urged by the urging member toward each other in the separating direction or the approaching direction, the second stage and above of each telescopic cylinder are urged. The positioned rectangular tubular body is pressed to one side with respect to the angular tubular body superposed on the outside thereof, and it is possible to eliminate rattling between the internal and external angular tubular bodies. In this case, one biasing member acts on each rectangular tubular body of both telescopic tubes. Further, when the urging member is provided only at one position between the expansion and contraction cylinders, the entire rectangular expansion and contraction cylinder is arched by urging the rectangular cylinder body urged by the urging member to one side. Even when the biasing member is provided only at the one position, it is possible to eliminate the play between the rectangular tubular bodies of the entire telescopic tube. 2
Since the pair of telescopic cylinders can be expanded and contracted at a constant speed in synchronization with each other, there is no problem even if the rectangular tubular bodies in the same stage are connected by the biasing member.

Further, in the lifting device according to the invention of claim 2,
Since the two telescopic cylinders are arranged so that the two side surfaces sandwiching one corner thereof are simultaneously subjected to the biasing action of the biasing member, the telescopic cylinders are separated by the biasing member or in the approaching direction. In the state of being urged to, the two side surfaces come into pressure contact with the two side surfaces of the rectangular tubular body located outside at the same time, so that each telescopic cylinder is prevented from rattling back and forth and left and right. .

[0019]

According to the lifting device of the present invention, a plurality of rectangular tubular members are continuously connected in a telescopic manner as a lifting device.
Since the telescopic cylinder of the book is used, the strength against the shaking in the horizontal direction is increased as compared with the conventional lift device using the telescopic cylinder. In addition, in the telescopic cylinder formed from such a rectangular tubular body, there is a slight gap between the inner and outer angular tubular bodies, which causes rattling. However, each telescopic tube is located in the same stage from the bottom to the second stage or more. Since the respective rectangular cylinders are mutually biased by the biasing member in either the separating direction or the approaching direction, it is possible to eliminate rattling between the inner and outer rectangular cylinders in each telescopic cylinder.
Therefore, when the lifting device is used, luggage such as a suspended load does not become loose and safety is improved.

Further, in the invention of claim 2 of the present application, since the two side surfaces sandwiching the corner portion of each telescopic cylinder are pressed by the biasing member,
It is possible to prevent each telescopic tube from rattling both front and rear and left and right, which has the effect of further improving safety.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to FIGS. 1 to 10. The lifting of the first embodiment is shown in FIGS. 1 to 8 and the second embodiment is shown in FIGS. The device is shown. In each of the embodiments, a bridge-type lifting device is installed as a lifting device, one on the left and one on the right, and the traveling carriages 2 and 2 are self-propelled. In each embodiment, the moving direction of the lifting device is referred to as the front-rear direction, and the direction orthogonal to the moving direction is referred to as the horizontal direction.

The hoisting device of the first embodiment shown in FIGS. 1 to 8 is a self-propelled traveling carriage on a pair of traveling rails (two pairs each) 1 and 1 laid at right and left intervals. Put 2, 2 (becomes the base in the claims),
Vertically retractable lift devices 3 and 3 are provided on the traveling carriages 2 and 2, and a beam unit 5 is installed between the upper ends of the lift devices 3 and 3.

The traveling rails 1, 1 are laid in a timely manner at the site where the heavy load W is transported. The left and right traveling rails 1,
The inner width between 1 is set to a considerable interval of about 8.5 m in this embodiment.

The traveling vehicles 2 and 2 are caused to travel on the traveling rails 1 and 1 in synchronization at a constant speed by a traveling drive device 10 composed of a hydraulic motor. This trolley 2
In this embodiment, the front-rear length is 3.2 m and the left-right width is 1.3-
It is about 1.4m. In addition, in another embodiment, a base installed at a fixed position may be used instead of the traveling carriage 2.
In that case, the lifting work is performed only at the fixed position.

Each of the left and right lifting devices 3 and 3 has two
The book includes a pair of telescopic cylinders 30 and 30. Each of the telescopic cylinders 30 and 30 has a plurality of (at least three or more) rectangular tubular bodies 31A to 31E sequentially connected in a telescopic manner, and each of the angular tubular bodies 31A to 31E is a hydraulic telescopic cylinder (patented). 32A to 32D, which serves as an expansion / contraction device in the claims, can be expanded and contracted vertically.

In this embodiment, as the telescopic tube 30, rectangular tubular members 31A to 31E having a rectangular cross section are used.
In addition, each of the rectangular cylinders 31A to 31E has a length of 2 to 2.5.
A length of about m is used, and the expansion and contraction cylinder 30 can secure an expansion and contraction stroke of about 5 to 6 m. In other embodiments, the rectangular tubular bodies 31A to 31E may have a triangular cross section or a pentagonal cross section or more.

As shown in FIG. 4 or FIG. 9, sliding pads 33, 33, ... Are respectively provided between the inner and outer square cylinders 31A to 31D. Although the pad 33 is provided between the inner and outer rectangular tubular bodies 31A to 31E, a minute gap is formed for expanding and contracting the rectangular tubular bodies.

A cover plate 5 is provided on the upper surface of the uppermost rectangular tubular body 31E.
1 is provided. A support piece 52 for supporting the beam unit 5 is provided at the center of the upper surface of the lid plate 51. As shown in FIGS. 5 and 6, the support piece 52 is in the shape of a thick plate and protrudes upward by an appropriate height.
Further, as shown in FIG. 3, the support piece 52 has an angle of 4 degrees with respect to the side surface 35 (or 36) of the telescopic tube 30 in a plan view.
It is formed with a displacement of 5 °. The upper surface of the support piece 52 is a convex arc surface 54 as shown in FIG. The operation of the convex arc surface 54 will be described later.

The telescopic cylinders 30 are set as a set of two on the traveling carriage 2 and are erected on the traveling carriage 2 at a predetermined distance (for example, the distance between the centers is 1.8 to 2 m). The pair of front and rear telescopic cylinders 30, 30 are attached such that the side surfaces 35, 36 thereof are displaced by 45 ° with respect to the front-rear direction, respectively, as shown in FIG. 3 or 4. With this configuration, each of the telescopic cylinders 30, 30 has one corner portion 34 located at the outer end portion (or inner end portion) on each of the front and rear sides. The telescopic cylinders 30, 30 are erected with the lowermost rectangular cylinder 31A fixed to the upper surface of the traveling carriage 2. Further, when the expandable cylinders 30 are attached, the support piece 52 provided on the upper end portion thereof is oriented in the left-right direction as shown in FIG.

In the first embodiment, a pair of rectangular tubular members 31B and 31B located at the same stage of the intermediate stage portion in the front and rear telescopic cylinders 30 and 30 constituting the left and right lift devices 3 and 3, respectively.
An urging member 12 for urging each of the rectangular tubular bodies 31B, 31B in the direction of separation or the direction of proximity is provided therebetween.
As shown in FIG. 4, the biasing member 12 uses a telescopic cylinder (hydraulic cylinder).
Is provided between the upper end portions of the rectangular tubular bodies 31B, 31B of the second stage from the bottom in the front and rear telescopic tubes 30, 30, respectively. In addition, the telescopic cylinders 12 are the second-stage rectangular tubular bodies 3 each.
The corners of the upper ends of 1B and 31B that are close to each other are connected to each other. Then, when the telescopic cylinder 12 is operated to the extension side with a predetermined pressure, the rectangular tubular body 31B of the front telescopic tubular 30 is biased to the front side, and at the same time the angular tubular body 31B of the rear telescopic tubular 30 is attached to the rear side. It has become a force. On the contrary, when the telescopic cylinder 12 is operated toward the contraction side, the rectangular tube body 31B of the front telescopic tube 30 is biased to the rear side and at the same time the angular tube body 31B of the rear telescopic tube 30 is biased to the front side. Come to do. Since the rectangular tubular bodies 31B and 31B of the same stage connected by the telescopic cylinder 12 can be telescopically extended and contracted at the same speed in synchronization with the operation of the lift device 3, even if the telescopic cylinder 12 is provided. There is no hindrance to the operation.
The operation of the biasing member (extendable cylinder) 12 will be described later.

The beam unit 5 includes top tables 6 and 6 provided on the upper ends of the telescopic cylinders 30 on the left and right sides, and two front and rear main beams 7 and 7 which are installed between the top tables 6 and 6. , And two hook beams 8 on the left and right, which are erected at intervals on the main beams 7, 7.

Each of the left and right top tables 6, 6 has a width of about 1 m in the left-right direction and a length of about 3 m in the front-rear direction. Also, each telescopic cylinder 3 in this top table 6
Fitting portions 61, 61 for fitting the support pieces 52, 52 are formed at the connecting portions with 0 and 30, respectively. The fitting portion 61 is formed by recessing upward from the lower surface of the top table 6 as shown in FIGS. Further, an abutting member 62 for reinforcement is attached to the ceiling surface of the fitting portion 61.

The top table 6 and the telescopic cylinder 30,
30 is assembled as shown in FIGS. That is, the fitting portions 61, 61 of the top table 6 are fitted into the support pieces 52, 52 at the upper ends of the respective telescopic cylinders 30, 30, and the top table 6 is supported by the upper surfaces of the support pieces 52, 52. , The support piece 52 and the fitting portion 6
The front and rear plates 63, 63 are connected by a pin 64. Further, the pin hole 53 on the support piece 52 side has a larger diameter than the pin 64, and the connection by the pin 64 is for preventing the top table 6 from being displaced with respect to the upper end portion of the telescopic cylinder 30. is there. Therefore, the beam unit 5
The load on the side is the upper surface of each support piece 52, 52 (convex arc surface 5
It is supported by 4) so that almost no load is applied to the pin 64.

The two main beams 7 and 7 are installed above and below the left and right top tables 6 and 6 with a predetermined interval (a center interval of each main beam is about 2.2 m) in the front and rear. The left and right ends of the main beams 7, 7 are bolted to the top surfaces of the top tables 6, 6, respectively.

As shown in FIG. 1 or 3, the two hook beams 8 and 8 are installed so that they can be moved in the left and right directions on the main beams 7 and 7 by telescopic cylinders (hydraulic cylinders) 18 and 18, respectively. Has been done. That is, in FIG. 1, when the telescopic cylinders 18 and 18 are extended, the hook beams 8 and 8 move to the left and right outer sides as indicated by reference numeral 8 ', and conversely, when the telescopic cylinders 18 and 18 are contracted, The hook beams 8 and 8 are adapted to move inward in the left and right directions as indicated by reference numeral 8 ″. Therefore, in this embodiment, the positions and intervals in the left and right directions of the hook beams 8 and 8 can be adjusted. The moving range of the hook beams 8 and 8 on each side is about 1 m,
The distance between the hook beams 8 can be adjusted within a maximum range of 2 m.

Each hook beam 8 is provided with a center hook 81 at the center in the lengthwise direction and side hooks 82 and 82 at both ends in the lengthwise direction.

The lifting device of the first embodiment is used as follows. First, the left and right traveling rails 1 and 1 are laid on both sides of the installation position of the heavy object W, and the traveling carriages 2 and 2, the lift devices 3 and 3 and the beam unit 5 are assembled on the traveling rails 1 and 1, respectively. Construct a lifting device. Then, the hooks 81, 81, 82 of the hook beams 8, 8
82 .. and heavy load W with wire ropes 83, 83 ..
After connecting (in the state shown in FIG. 1 and FIG. 3), the beam unit 5 is moved upward by the left and right lift devices 3 and 3 to load the heavy load W.
The suspension drive (state of FIG. 7), and in that state the traveling drive device 1
By causing the traveling carriages 2 and 2 to travel along the traveling rails 1 and 1 by 0 and 10, the heavy object W can be transported to the target position.

By the way, as described above, the front and rear telescopic cylinders 30, 30 are installed in a state of being displaced by an angle of 45 ° in plan view, respectively, and the front and rear telescopic cylinders 30 are respectively arranged by the urging member (the telescopic cylinder) 12. Square tubular body 31B, 3
Since 1B is urged in the separating direction or the approaching direction to each other, the urging force of the urging member 12 simultaneously acts on the two side surfaces 35, 36 sandwiching each corner portion 34 of each telescopic cylinder 30, 30. . In this way, when the rectangular tubular bodies 31B, 31B located in the same stage of the intermediate step portion of the front and rear telescopic cylinders 30, 30 are biased in the separating direction or the approaching direction, the angular tubular bodies 31B are biased. Are pressed to one side with respect to the rectangular tubular body 31A that is superposed on the outside thereof.
Rattling can be eliminated between 1A and 31B. or,
As in the first embodiment, the urging member 12 is attached to the front and rear telescopic cylinder 3.
In the case of interposing only one intermediate step between 0 and 30,
The rectangular tubular body 31B, 3 urged by the urging member 12
1B is urged to one side to act to deform the entire telescopic cylinders 30, 30 in an arched shape, and even when the urging member 12 is provided only at the one position, the full-angle tubular body of the telescopic cylinder 30. It is possible to eliminate backlash between 31A to 31E. Particularly, as in this embodiment, the biasing member 12 pushes one corner of the rectangular tubular body 31B in the diagonal direction side (or pulls one corner in the opposite direction to the diagonal direction). Then, the two side surfaces sandwiching the corner portion of the biased square tubular body 31B come into pressure contact with the two side surfaces of the square tubular body 31A located outside thereof at the same time.
0 and 30 will not rattle forward and backward and left and right. In this way, the rectangular tubular bodies 31A to 31E of the telescopic tubes 30 and 30.
If there is no play between them, the beam unit 5 and the suspended load W will not grind when the lifting device is used, and the safety will be improved.

By the way, the suspended load W carried by this type of lifting device has a considerably large weight (for example, it may be about 100 tons), and as shown in FIG. When suspended from 5, the main beam 7 may bend downward as shown in FIG. 8 due to the load. In this case, on the end side of the main beam 7, the center side inclines downward with respect to the horizontal line L (becomes an inclined line M, and at that time, a slight angle a is generated between the horizontal line L and the inclined line M).
When the end portion side of the main beam 7 is inclined in this way, when the top table 6 and the upper end portion of the telescopic tube 30 are fixed (for example, fastened with a pin) as in the conventional case, the telescopic tube 30 is provided.
The load applied to G is the axial direction (vertical direction) G of the telescopic tube 30.
Therefore, it is added in the direction inclined to the outside by a slight angle a. Then, in this way, the direction of the load is set to each of the telescopic tubes 30, 3
An angle with respect to the axis of 0 causes an unnatural effect (falling effect) on the expandable cylinder 30, which is not preferable in terms of strength.

In view of such a problem, in the present embodiment, as shown in FIGS. 5 and 6, the load of the beam unit 5 and the suspended load W is applied to the support piece 52 provided at the upper end of the telescopic cylinder 30. It is supported on the upper surface. The pin 64
Is to prevent the top table 6 from being displaced, and it is not necessary to receive the load applied to the top table 6 by the pins 64. As described above, the support piece 52 is installed so that its plate-shaped surface is oriented in the length direction (left-right direction) of the main beam 7, and the upper surface of the support piece 52 is the main beam 7. Convex arc surface 54 in the length direction
Has become. When the load is thus supported by the convex arc surface 54 of the support piece 52, the abutting member 62 (top table 6 side) and the support piece 52 come into linear contact with each other in the front-rear direction. Further, as shown in FIG. 8, even when the main beam 7 is bent by the load of the suspended load W and the end side of the top table 6 is inclined in the left-right direction, the contact position of the lower surface of the abutting member 62 with the convex arc surface 54 is very small. The load is only displaced slightly inward, and the load is always in the vertical direction (the telescopic cylinder 30).
Direction) G. Therefore, the telescopic cylinder 30
In contrast, no unnatural load is applied.

The lifting device of the second embodiment shown in FIGS. 9 and 10 shows a modification of the urging member in the first embodiment. In the second embodiment, a rod whose length can be adjusted by bolts and nuts is used as the biasing member 13. Further, in this second embodiment, the two pair of extension sleeve 30, 30 before and after three sets of square tubular body (31B located at each same stage of the three intermediate stepped portion except the lowermost and uppermost,
31B, 31C, 31C, 31D, 31D), two rods (biasing members) 13, 13 are provided respectively. That is, the rods 13 are arranged between the upper end portions of the second-stage square tubular bodies 31B and 31B, between the upper end portions of the third-stage square tubular bodies 31C and 31C, and the fourth stage from the bottom. Two pieces are provided between the respective upper end portions of the square prismatic bodies 31D, 31D. Further, these rods 13 (six in total) are expanded or contracted with bolts and nuts for length adjustment, so that the rectangular tubular bodies (31B to 3B) of the same stage are formed.
1D, 31B to 31D) are connected to each other in a state in which they are biased in the separating direction or the approaching direction. In the second embodiment, an inexpensive rod 13 can be used as the urging member, and since the second to fourth stages of the rectangular cylinders from the bottom are urged by the rods 13, respectively, they are superposed in and out. It is possible to prevent each of the square cylinders that are operating from rattling even further.

In each of the above embodiments, the bridge-type lifting device is explained, but in other embodiments, the telescopic cylinder 30,
It is also applicable to a case where only one set of 30 is used, and in that case, it is preferable to provide a luggage stand across the upper part of each telescopic tube 30, 30.

[Brief description of drawings]

FIG. 1 is a front view of a lifting device according to a first embodiment of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is an enlarged view of IV-IV in FIG.

5 is a partially enlarged cross-sectional view of FIG.

6 is a cross-sectional view taken along the line VI-VI of FIG.

FIG. 7 is a state change diagram of FIG.

8 is a view corresponding to FIG. 5 in the state of FIG. 7.

FIG. 9 is a view of a lifting device according to a second embodiment of the present invention.
FIG.

FIG. 10 is a view corresponding to FIG. 7 in the lifting device of the second embodiment of FIG. 9.

FIG. 11 is a front view of a conventional lifting device.

FIG. 12 is a left side view of FIG. 11.

13 is a plan view of FIG. 11. FIG.

[Explanation of symbols]

1 is a traveling rail, 2 is a traveling carriage, 3 is a lift device, 5 is a beam unit, 6 is a top table, 10 is a traveling drive device, 12 is an urging member (extendable cylinder), 13 is an urging member (rod), 30 is a telescopic cylinder, 31A to 31E are rectangular tubular bodies, 32A to 32D are telescopic cylinders, 34 is a corner portion, 3
5, 36 are side surfaces.

Claims (2)

[Claims] 1. A lifting device comprising a base (2) and a vertically expandable / contractible lift device (3) provided on the base (2), wherein the lift device (3) has a polygonal cross section and a plurality of rectangular cylinders. (31A to 31E) are connected in a telescopic manner and each of the rectangular tubular bodies (31A to 31E) is extended and contracted (32A to 31E).
32D) Telescopic cylinder (3
0) are used at a predetermined interval, and the rectangular tubular bodies (31B to 31D, 31B) located on the same stage from the second stage from the bottom of the two telescopic barrels (30, 30).
To 31D), the double-sided tubular body (31B to 31D, 31B).
31D) are interposed between the biasing members (12, 13) for biasing one of the separating direction and the approaching direction with respect to each other. 2. The lifting device (3) comprises a telescopic cylinder (30,
30) two side surfaces (35,
36) are arranged so that they are simultaneously subjected to the biasing action of the biasing members (12, 13).
Lifting device described.