JPH08133665A - Bridge type crane device - Google Patents

Abstract

PURPOSE: To enable load, applied to each lifting device, to act almost vertically even when a beam bends by laying a beam unit between the upper end parts of a pair of lifting devices installed with a space in the lateral direction, and forming the upper face of a supporting piece for supporting the beam unit, into the protruding circular arc face. CONSTITUTION: Traveling trucks 2, 2 are respectively placed on a pair of travel rails 1, 1 laid with a lateral space, vertical expansion type lifting devices 3, 3 are provided on the respective traveling trucks 2, 2, and a beam unit 5 is laid between the upper end parts of both lifting devices 3, 3. In each lifting device 3, rectangular cylinder bodies 31A-31E are used as an expansion cylinder 30, and a cover plate 51 is provided at the upper face of the rectangular cylinder body 31E in the uppermost stage. In this case, the upper face center part of the cover plate 51 is provided with a supporting piece 52 with the upper face formed into the protruding circular arc face in order to support the beam unit 5, while a fit-in part 61 for fitting in each supporting piece 52 is formed at a connecting part to the expansion cylinder 30 in a top table 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge type lifting device for vertically moving a heavy load.

[0002]

2. Description of the Related Art An example of a conventional bridge-type lifting device of this type is shown in FIGS. The conventional bridge-type lifting device shown in FIGS. 11 to 13 is
Self-propelled traveling carriages 2 and 2 are mounted on a pair of traveling rails (one set of two) 1 and 1 which are laid at intervals on the left and right sides, and vertical traveling telescopic carriages 2 and 2 are respectively mounted on the traveling carriages 2 and 2. Lifting devices 3 and 3 are provided, and a beam unit 5 is installed between the upper ends of the lifting devices 3 and 3.

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 so that a total of four cylinders 31a to 31d are successively connected in a telescopic manner and each of the tubular bodies 31A to 31D can be vertically telescopically extended 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 laterally oriented pins 64. Each of the beams 7 and 7 has two hanging hooks 82 and 8 respectively.
2 (four in total) are provided, and each hanging hook 82, 8
The heavy object W can be hung from the wire ropes 83, 83. As the heavy object W to be handled, there is a container, a machine tool or the like having a considerably large weight (for example, 50 to 100 tons).

In this conventional bridge-type 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 carriages 2, 2 and a lift are provided on each traveling rail 1, 1. Assemble the devices 3 and 3 and the beam unit 5. And the hanging hooks 82, 82 of the beams 7, 7 and the heavy load W
After connecting and with the wire ropes 83, 83 ..., The beam unit 5 is moved upward by the left and right lift devices 3, 3 to suspend the heavy object W, and the traveling carriages 2, 2 are driven by the traveling drive devices 10, 10. By traveling along the traveling rails 1 and 1, the heavy object W can be conveyed to a target position.

By the way, the suspended load W transported by this type of bridge-type lifting device has a considerably large weight (for example, it may be about 100 tons), and as shown in FIG. When suspended from the beam unit 5, the load may cause the beam 7 to bend downward as indicated by reference numeral 7 '. In this case, the center of each end of the beam 7 is inclined downward with respect to the horizontal line L (becomes the inclined line M, and at that time, a slight angle a is generated between the horizontal line L and the inclined line M).

[0007]

However, in the conventional bridge-type lifting device shown in FIGS. 11 to 13, the top table 6 and the upper end portion of the telescopic cylinder 31 are provided with the laterally-directed pins 6.
4 and tighten the load on the beam unit 5 side with each pin 6
Since it is supported only by 4, 64, ..., The pin 64 is subjected to a shearing action due to the load on the beam unit 5 side. Therefore, in order to secure the strength of the support portion at the upper end of the telescopic cylinder 31, the pin 64 needs to have a large diameter, and the structure of the pivotal support portion of the pin 64 is configured to have a large strength capable of supporting a large load. However, there is a problem that the structure of the supporting portion becomes large.

Further, in the conventional bridge-type lifting device shown in FIGS. 11 to 13, when the load W is heavy, the beam 7 is indicated by the reference numeral 7'due to the load of the load as described above. So that it will bend downwards. Then, the end portion side of the beam 7 is inclined, and the load applied to the telescopic cylinder 31 is applied in the direction inclined outward by the angle a from the axial direction (vertical direction) G of the telescopic cylinder 31. When the direction of the load has an angle with respect to the axis of the telescopic cylinder 31 as described above, an unnatural action (overturning action) acts on the telescopic cylinder 31, which is not preferable. It was

In view of the above-mentioned conventional problems, the present invention can support a large load on the beam unit side with a simple structure, and even when the beam is deflected by the load of a suspended load, it is added to each lift device. It is an object of the present invention to provide a hoisting device in which a load is directed almost vertically.

[0010]

As a means for solving the above-mentioned problems, the present invention provides lift devices on a pair of bases arranged at intervals on the left and right sides, and further, upper end portions of the both lift devices. In a bridge-type lifting device having a beam unit installed between them, support pieces for supporting the left and right ends of the beam unit are formed at the upper ends of the lift devices, and the left and right sides are supported. It is characterized in that the upper surface of each piece is formed as a convex arc surface in the left-right direction and the load on the beam unit side is supported by the convex arc surface of each support piece.

The base may be one that is stung at a fixed position, or one that can be moved using a traveling carriage.

As the lift device, a telescopic cylinder in which a plurality of cylinders are successively connected in a telescopic manner can be used. In addition, it is preferable to provide a plurality of the expandable cylinders on each of the left and right sides by two or three or more.

The support piece provided at the upper end of each lift device is
For example, a thick plate is formed by projecting a small height upward from the upper end of the lift device, and the thick plate-shaped support piece is installed in a state of being oriented in the left-right direction (the length direction of the beam unit). Good to do. Further, the upper surface of the supporting piece is a convex arc surface in the left-right direction (the length direction of the beam unit), but by forming the upper surface of the supporting piece into a convex spherical surface, a convex arc surface is formed in the left-right direction. It is also possible to do so.

The left and right ends of the beam unit are supported by the convex arcuate surfaces of the support pieces provided at the upper ends of the left and right lift devices. The ends of the beam unit and the support pieces are pivoted by pins. You may wear it. However, in this case, the pin is for preventing the beam unit from falling off or being displaced, and does not support the load on the beam unit side with the pin.

[0015]

In the bridge-type lifting device of the present invention, when the beam unit is moved upward by the left and right lifting devices while the suspended load is connected to the beam unit by the wire rope, the suspended load is suspended by the beam unit. .

When a traveling carriage is used as a base, the traveling carriage can be moved to convey the suspended load to a target position together with the lifting device.

The load on the beam unit side is directly supported from below by the upper surfaces of the support pieces at the upper ends of the left and right lift devices. At this time, the load acts in the direction of compressing the support piece downward, but the support piece has high strength against such a compression action.

Further, when a heavy load is suspended by the beam unit, the beam unit may be bent by the load of the suspended load. In that case, the end portion side of the beam unit with respect to the horizontal line. Incline so that the center side inclines downward. By the way, if the end side of the beam unit is tilted in this way, the load tilts outward from the axial direction (vertical direction) of the lift device when the lift device and the beam unit are fastened with pins as in the conventional case. The lifting force is applied toward the vertical direction, and an unnatural action (falling action) acts on the lift device. However, in the present invention, since the upper surface of the support piece that supports the beam unit is a convex arc surface in the left-right direction (the length direction of the beam unit), the beam unit bends due to the load of the suspended load and its end is bent. Even if the part side is tilted, the contact position with respect to the convex arc surface of the lower surface of the beam unit is displaced only slightly inward, and the load is always almost perpendicular to the lift device (axial direction of the lift device). I will join you.

[0019]

In the hoisting device of the present invention, the supporting pieces are provided at the upper end portions of the left and right lifting devices, and the upper surfaces of the supporting pieces are formed as convex arc surfaces in the left-right direction. The load on the beam unit side can be supported by the supporting piece having a relatively simple structure, and the structure of the supporting portion can be simplified. Further, even when the beam unit bends due to the load of the suspended load and its end side is inclined, the contact position with respect to the convex arc surface of the lower surface of the beam unit is displaced only slightly inward, and the load is applied to the lift device. On the other hand, it is always applied almost vertically (axial direction of the lifting device). Therefore, the load in the unnatural direction is not applied to the lift device, the load on the beam unit side can be supported in a stable state, and the safety is improved.

[0020]

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

The bridge type hoisting device of the first embodiment shown in FIGS. 1 to 8 is a self-propelled type on a pair of traveling rails (one set of two) 1, 1 laid at right and left intervals. Traveling carts (which are the bases in the claims) 2 and 2 are mounted, and vertically movable lift devices 3 and 3 are provided on the traveling carts 2 and 2, respectively. The beam unit 5 is installed between the upper ends of the.

The traveling rails 1, 1 are laid in a timely manner at the site where the heavy object 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 lift 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 32A to. It is configured so that it can be expanded and contracted vertically in 32D.

In this embodiment, as the telescopic cylinder 30, rectangular cylinders 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.

The lid 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 erected as a set of two on the traveling carriage 2 in a front and rear direction with a predetermined interval (for example, a center-to-center interval of 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 cylinders 31B, 31B located at the same stage of the intermediate stage in the front and rear telescopic cylinders 30, 30 constituting the left and right lift devices 3, 3.
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 provided 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, 82 at both ends in the lengthwise direction.

The bridge-type lifting device according to the first embodiment is
It 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. Bridge-type lifting device. After connecting the hooks 81, 81, 82, 82 ... Of the hook beams 8 and the heavy object W with the wire ropes 83, 83 .. (state of FIG. 1 and FIG. 3), left and right lift devices Beam unit 5 by 3 and 3
To lift the heavy object W (state of FIG. 7), and in that state, the traveling carriages 10 and 10 cause the traveling carriages 2 and 2 to travel along the traveling rails 1 and 1, respectively. 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 a plan view, and the front and rear telescopic cylinders 30 are arranged by the biasing 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, although the suspended load W transported by this type of lifting device has a considerably large weight (for example, it may be about 100 tons), the load of the suspended load W depends on the telescopic cylinder 3.
It acts on the support piece 52 at the upper end of 0 in the direction of compressing downward. Thus, even if a load is applied to the support piece 52 in the downward compression direction, the support piece 52 has high strength in the downward compression direction.

When the suspended load W is suspended from the beam unit 5 as shown in FIG. 7, the main beam 7 may be bent downward by the load as shown in FIG. 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 side of the main beam 7 is inclined in this way, when the top table 6 and the upper end of the telescopic tube 30 are fixed (for example, fastened with a pin) as in the conventional case, the load applied to the telescopic tube 30 is increased. Then, it is added in a direction in which the telescopic tube 30 is slightly inclined outward from the axial direction (vertical direction) G by an angle a. If the direction of the load has an angle with respect to the axis of the telescopic tube 30 as described above, an unnatural action (overturning action) is exerted on the telescopic tube 30, which is not preferable. 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 supported by the upper surface of the support piece 52 provided at the upper end of the telescopic cylinder 30. I am trying to do it. The pin 64 is for preventing the top table 6 from falling off or being displaced.
Therefore, it is not necessary to receive the load applied to the top table 6.
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. A convex arc surface 54 is formed in the length direction. 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. It is displaced only slightly inward, and the load is always almost vertical (axial direction of telescopic tube 30).
It becomes suitable for G. Therefore, a load in an unnatural direction is not applied to each telescopic tube 30, 30.

The bridge-type 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, the biasing member 13
A rod whose length can be adjusted with bolts and nuts is used as the. Further, in this second embodiment, the front and rear 2
Three sets of rectangular tubular bodies (31B, 31B, 31C, 31C, 31D, 31D) located at the same stage of each of the three intermediate stages excluding the lowermost stage and the uppermost stage in the one set of telescopic tubes 30, 30.
Between the two rods (biasing members) 13 and 1
3 are installed. 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. Between the upper end portions of the prismatic bodies 31D, 31D of the eyes,
Two are installed in each. In addition, these rods 13 (six in total) are expanded or contracted by length adjusting bolts and nuts to separate the rectangular tubular bodies (31B to 31D, 31B to 31D) of the same stage from each other. It is connected in the state of being biased in the direction or the approach 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 addition, the telescopic cylinder 30 in the second embodiment.
The support structure for the upper beam unit 5 is the first
It is similar to the embodiment.

[Brief description of drawings]

FIG. 1 is a front view of a bridge-type 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.

9 is a view corresponding to FIG. 4 of a bridge-type lifting device according to a second embodiment of the present invention.

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

FIG. 11 is a front view of a conventional bridge-type 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, 30 is a telescopic cylinder, 52 is a support piece, 53 is a pin hole, 5
4 is a convex arc surface, 61 is a fitting portion, 62 is an abutting member, and 64 is a pin.

Claims (1)

[Claims] 1. Lifting devices (3, 3) are provided on a pair of bases (2, 2) arranged at intervals on the left and right, and a beam is provided between the upper ends of the lifting devices (3, 3). A bridge-type lifting device comprising a unit (5) installed, the supporting piece for supporting the left and right ends of the beam unit (5) at the upper ends of the lift devices (3, 3). (52) are formed respectively, the upper surfaces of the support pieces (52, 52) on the left and right sides are respectively formed as convex arc surfaces (54) in the left-right direction, and the load on the beam unit (5) side is set. Each of the support pieces (5
2, 52) supported by convex arc surfaces (54, 54).