JP6694639B1 - Lifting device and work table boat equipped with the lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevating device capable of stabilizing engagement between an engagement pin of a locking device and an engaged part of a leg and suppressing an increase in weight and cost of the leg, and a work pontoon equipped with the elevating device. To do. A lifting device (4) that enables relative movement with respect to a leg (3) that supports a platform (2), and a plurality of engaging recesses (35) are formed on the engaging surfaces of two opposing surfaces of the leg. The elevator device drives the engagement pin 56 for locking and fixing the leg to engage the engagement convex surface 58 of the engagement pin with the engagement concave surface 36 of the engagement concave portion. A locking device 50 and a lifting cylinder device 60 that moves one of the pair of locking devices up and down so that the pair of locking devices move away from or approach each other are provided, and the engagement recess is tapered toward the inside of the leg. In addition to the shape, the engagement pin has a taper shape which is tapered toward the engagement recess. [Selection diagram] Fig. 3

Description

  The present invention relates to a lifting device and a work pontoon ship equipped with the lifting device.

  For example, in Patent Document 1, a plurality of support columns (hereinafter, also referred to as legs, but sometimes referred to as spuds) inserted into guide holes of the platform, and through engagement holes (engagement target) formed in the legs. And a pair of lock devices for driving the movable side engagement pin and the fixed side engagement pin, respectively, and a lifting cylinder device for connecting and supporting the pair of locking devices. Is disclosed. The lifting device lifts the platform above the sea surface by moving the leg in a downward direction relative to the platform. Placing the platform above the sea surface, which is not affected by the waves, stabilizes the platform.

  When the connecting rod of the elevating cylinder device is projected in a state in which the fixed side engagement pin is inserted into the through engagement hole and the movable side engagement pin is pulled out from the through engagement hole, the movable side lock device moves up. When the movable side engagement pin is further inserted into the through engagement hole and the fixed side engagement pin is pulled out from the through engagement hole, the connecting rod of the lifting cylinder device is retracted. Platform) will rise. The platform is gradually raised by the lifting device repeating the operation.

JP 61-51497 A

  In Patent Document 1, the through engagement hole penetrates the tube wall of the leg having a cylindrical shape, and the inner diameter of the through engagement hole is larger than the outer diameter of the engagement pin so that the engagement pin and the through engagement hole are separated from each other. A through engagement hole is formed so that there is a gap in. Since the engaging pin partially contacts and is supported by the arcuate lower pipe wall cross section of the through engaging hole, the engaging contact area between the engaging pin and the through engaging hole is small. As a result, the stability of the engagement is poor because the engaging pin rattles in the through engaging hole, and an excessive load is applied to the lower pipe wall cross section of the through engaging hole. Need to be up. That is, increasing the strength of the leg leads to an increase in the weight and cost of the leg. Therefore, in the configuration of Patent Document 1, there is a problem that the engagement between the engagement pin and the engaged portion is unstable, and the weight and cost of the leg increase.

  Further, in Patent Document 1, a plurality of through engagement holes are formed so as to be separated from each other in the longitudinal direction of the leg. Therefore, there is a problem in that relative movement in the vertical direction cannot be performed in a minute amount, and it takes time to align the engagement pin with the through engagement hole under the condition of rocking under the influence of waves.

  Therefore, an object of the present invention is to provide an ascending / descending device and an ascending / descending device capable of stabilizing the engagement between the engagement pin of the locking device and the engaged portion of the leg and suppressing an increase in weight and cost of the leg. It is to provide a work pontoon.

In order to solve the above problems, the lifting device according to an aspect of the present invention,
A lifting device that enables relative movement with respect to a leg that supports a platform,
A plurality of engagement recesses are formed in the longitudinal direction of the leg on the two opposing engagement surfaces of the leg,
The lifting device is
A pair of locking devices that drive an engagement pin for locking and fixing the leg to engage an engagement convex surface of the engagement pin with an engagement concave surface of the engagement concave portion,
An elevator cylinder device that moves up and down one of the pair of locking devices so that the pair of locking devices separates or approaches each other,
The engaging recess is tapered toward the inside of the leg, and the engaging pin is tapered toward the engaging recess.

  According to the present invention, the engagement pin of the locking device and the engagement recess (engagement portion) of the leg are tapered to each other, so that they are easily and reliably engaged with each other. Therefore, the engagement between the engagement pin of the lock device and the engagement recess of the leg is stable, and the weight and cost of the leg are not increased.

1 is a schematic side view showing an elevating device according to an embodiment and a work pontoon ship equipped with the elevating device. FIG. 2 is a plan view of the lifting device and work platform shown in FIG. 1. It is a principal part enlarged view explaining the locking device of the raising / lowering apparatus shown in FIG. It is a figure explaining the lock fixation by the lock device of the raising / lowering apparatus shown in FIG. FIG. 3 is a schematic side view illustrating an elevating operation by an elevating cylinder device of the elevating device shown in FIG. 1. It is a side view which shows the modification of the engaging recessed part formed in the leg.

  Embodiments of an elevating device 4 according to the present invention and a work pontoon 1 including the elevating device 4 will be described below with reference to the drawings.

[Overall structure of work platform]
FIG. 1 is a schematic side view showing an elevating device 4 and a work pontoon 1 including the elevating device 4 according to an embodiment. FIG. 2 is a plan view of the lifting device 4 and the work table 1 shown in FIG.

  The work pontoon 1 is a self-elevating work pontoon (SEP: Self Elevating Platform) including a platform 2 as an offshore structure, a lifting device 4 as up-and-down driving means, and a leg 3 as a supporting column. is there. The work pontoon 1 is used as an anchorage facility for anchoring a ship, as an offshore wind power generation facility, as a jetty, or as an offshore heliport. On the platform 2, a ship lifter, an offshore wind turbine, a crane, etc. are appropriately installed.

  After towing the work pontoon 1 to a predetermined installation point, the leg 3 is moved downward relative to the platform 2 by the lifting device 4 at the predetermined installation point. When the leg tip 33 of the leg 3 is pushed into the seabed 9, a reaction force from the seabed 9 can be obtained, and the reaction force can raise the platform 2 above the sea surface 8. The platform 2 is lifted to a height (for example, 10 m) that is not affected by waves. By maintaining this state, the work platform 1 is erected in the ocean.

  As shown in FIGS. 1 and 2, the platform 2 has a substantially rectangular parallelepiped shape with a low height, is substantially rectangular when viewed from above, and includes a top plate 21, a bottom plate 22, side plates 23, and a partition plate 24. .. The platform 2 is, for example, 120 m long × 40 m wide × 6 m high.

  Guide holes 25 that penetrate the platform 2 in the height direction (vertical direction) are formed at the four corners of the platform 2. The guide hole 25 has, for example, a rectangular shape so that the rectangular leg 3 can pass through the guide hole 25 in the vertical direction. An MC nylon plate, for example, is attached as a hole side sliding member 29 (shown in FIG. 3) to each corner portion (8 places) of the guide hole 25. By providing the hole-side sliding member 29 at each corner of the guide hole 25, the slide of the leg 3 in the guide hole 25 can be maintained for a long period of time. When the MC nylon plate becomes worn, it is replaced with a new one. An inner space 26 surrounded by the upper plate 21, the bottom plate 22, and the side plate 23 is partitioned by a plurality of partition plates 24.

  The internal space 26 of the platform 2 has a watertight structure, and the platform 2 can obtain buoyancy by this watertight structure, and the entire work pontoon 1 can float in water. Therefore, with the work pontoon 1 floating on the sea surface 8, the work pontoon 1 can be towed and moved to the installation point. In addition, the work pontoon 1 may be configured to be self-propelled and move to an installation point by including a propulsion device such as a screw propeller.

  As shown in FIG. 1, the lifting device 4 is attached to the platform 2 as a lifting unit 40 so as to surround the guide holes 25 formed at the four corners of the platform 2. The lifting device 4 is mounted flush with the upper plate 21 by being locked to a locking step formed on the upper plate 21 of the platform 2 by a flange 41 provided at the upper end of the lifting unit 40. According to this configuration, the worker can safely work on the upper plate 21 of the platform 2.

  As shown in FIG. 1, the elevating unit 40 of the elevating device 4 is arranged so as to fit in the space between the upper plate 21 and the bottom plate 22 of the platform 2. According to this structure, the center of gravity of the work platform ship 1 can be lowered, and the stability of the work platform ship 1 against shaking during towing can be improved. Further, the lifting unit 40 has a watertight structure due to a known sealing structure.

[Leg structure]
As shown in FIG. 1 and FIG. 4, the leg 3 that supports the platform 2 is a hollow square (a cross section is, for example, a substantially square) steel pipe, and has two engaging surfaces 31 facing each other and two engaging surfaces 31 facing each other. And a guide surface 32. The leg 3 is, for example, 3 m square and has a length of 50 m. A flat plate made of, for example, SUS304 is fixed as a leg-side sliding member 39 (shown in FIG. 3) to each corner portion (two places per corner) of the leg 3. The leg-side sliding member 39 extends over substantially the entire length of the leg 3 in the longitudinal direction (vertical direction).

  By providing the leg-side sliding member 39 at each corner of the leg 3, the sliding of the leg 3 in the guide hole 25 can be maintained for a long period of time. When the leg 3 is inserted into the guide hole 25, the gap tolerance between the hole side sliding member 29 and the leg side sliding member 39 is small, for example, about 3 mm. As a result, the deviation in the longitudinal orthogonal direction (lateral direction) orthogonal to the longitudinal direction (vertical direction) of the leg 3 can be reduced, and the leg 3 can move straight in the vertical direction.

  A plurality of engagement recesses 35 are formed in the longitudinal direction of the leg 3 at the widthwise centers of the two facing engagement surfaces 31. The engagement recess 35 does not penetrate in the direction orthogonal to the longitudinal direction (lateral direction) of the leg 3. Preferably, the plurality of engagement recesses 35 are continuously formed in the longitudinal direction of the leg 3. According to this configuration, the leg 3 can be relatively moved in the vertical direction by a very small amount, so that a minute alignment can be performed. The engagement recess 35 has a circular shape when viewed from the front, and also has a taper shape (trapezoidal shape) that tapers toward the inside of the leg 3 when viewed in cross section. According to this configuration, the engagement pin 56 of the locking device 50, which will be described later, easily engages with the engagement recess 35 of the leg 3, and the engagement contact area between the engagement pin 56 and the engagement recess 35. Is larger, it is possible to securely lock the lock with the lock device 50. The engagement recess 35 is formed, for example, with an insertion opening diameter of 500 mm, a curved portion of 100 mm, and a pitch of 600 mm.

[Structure of lifting device]
FIG. 3 is an enlarged view of the main parts for explaining the lock device 50 of the lifting device 4 shown in FIG. FIG. 4 is a diagram for explaining lock fixing by the lock device 50 of the lifting device 4 shown in FIG. FIG. 5 is a schematic side view for explaining the lifting operation by the lifting cylinder device 60 of the lifting device 4 shown in FIG. The lock device 50 is provided around the certain leg 3 with two on one side and two on the other side, that is, a total of four lock devices 50. That is, a pair of upper and lower lifting cylinder devices 60 are arranged on the side of the engagement surface 31 on one side so as to be spaced apart in the longitudinal direction (vertical direction) of the leg 3, and a pair of upper and lower sides on the side of the engagement surface 31 on the other side. The cylinder devices 60 are arranged in the longitudinal direction (vertical direction) of the leg 3 so as to be separated from each other.

  As shown in FIG. 4, each lifting device 4 includes a pair of upper and lower locking devices 50 and a lifting cylinder device 60. The pair of upper and lower lock devices 50 includes an upper lock device 50a and a lower lock device 50b. The upper lock device 50 a is attached to the movable base 70 via the bracket 72 and is movable in the longitudinal direction (vertical direction) of the leg 3. The lower lock device 50b is attached to the fixed base 71 via the bracket 72, and is immovable and fixed in the longitudinal direction (vertical direction) of the leg 3. The fixed base 71 is fixed to the upper plate 21 of the platform 2.

  As shown in FIG. 3, the lock device 50 includes a lock cylinder 51, a lock piston rod 52, a piston 55, and an engagement pin 56. The engagement pin 56 has a substantially truncated cone shape. That is, the engagement pin 56 has a circular shape in a front view, and has a shape in which a mountain shape of a pin tip 57 is added to a tapered taper shape (trapezoidal shape) toward the engagement recess 35 in a sectional view. is doing. The lock device 50 is watertightly configured by a seal structure 53 having a seal member 54.

  The lock device 50 drives the piston 55 with a fluid such as hydraulic pressure to cause the engagement pin 56 attached to the tip of the piston 55 to move in a longitudinal orthogonal direction (horizontal direction) orthogonal to the longitudinal direction (vertical direction) of the leg 3. Drive to. When the engagement pin 56 is driven toward the engagement recess 35 of the leg 3, the engagement pin 56 projects and is press-fitted into the engagement recess 35 to be engaged. At this time, the engaging convex surface 58 of the engaging pin 56 closely engages with the engaging concave surface 36 of the engaging concave portion 35 in the circumferential surface shape. When the engagement pin 56 is driven to the side opposite to the engagement recess 35 of the leg 3, the engagement pin 56 retracts and becomes disengaged from the engagement recess 35. At this time, the engaging convex surface 58 of the engaging pin 56 is disengaged from the engaging concave surface 36 of the engaging concave portion 35.

  The slope of the engagement convex surface 58 of the engagement pin 56 is configured to be larger than the slope of the engagement concave surface 36 of the leg 3. For example, the inclination of the engagement convex surface 58 is 15 degrees, and the inclination of the engagement concave surface 36 is 14 degrees. In other words, the taper angle of the engagement convex surface 58 is 30 degrees, and the taper angle of the engagement concave surface 36 is 28 degrees. According to this configuration, since the engagement convex surface 58 engages with the insertion opening portion outside the engagement concave surface 36, even if the engagement pin 56 is reduced in diameter due to wear with the engagement concave portion 35, the engagement pin 56. Can be further projected toward the inside of the engaging recess 35 and press-fitted, so that the locking device 50 can be used for a long period of time.

  As shown in FIG. 3, in the engaged state, there is a gap between the pin tip 57 of the engagement pin 56 and the inner portion of the engagement recess 35 of the leg 3. According to this configuration, even if the engagement pin 56 is reduced in diameter due to abrasion with the engagement recess 35, the engagement pin 56 can be further projected and pressed into the engagement recess 35, and thus the lock can be achieved. The device 50 can be used for a long period of time.

  The lifting cylinder device 60 of the lifting device 4 will be described with reference to FIGS. 4 and 5. Four lifting cylinder devices 60 are arranged around a certain leg 3. That is, on the side of the engagement surface 31 on one side, two lifting cylinder devices 60 are arranged separately in the direction orthogonal to the longitudinal direction of the leg 3 (lateral direction), and on the side of the engagement surface 31 on the other side, two lift cylinder devices 60 are arranged. The elevating cylinder device 60 is arranged so as to be separated in the direction orthogonal to the longitudinal direction (lateral direction) of the leg 3. When the platform 2 is supported by the four legs 3, a total of 16 lifting cylinder devices 60 are provided. One lifting cylinder device 60 has, for example, a lifting capacity of 1250 tons and a stroke of 1500 mm. Therefore, the work platform 1 as a whole has a lifting capacity of 20,000 tons, for example.

  Each lifting cylinder device 60 has a lifting cylinder 61, a lifting piston rod 62, a first port 66, and a second port 67. The lifting cylinder 61 is attached to the fixed base 71 via a cylinder connecting member 65. The lifting piston rod 62 is attached to the movable base 70 via a rod connecting member 63.

  Each lifting cylinder device 60 drives a piston (not shown) in the lifting cylinder 61 with a fluid such as hydraulic pressure to drive a lifting piston rod 62 attached to the piston in the longitudinal direction (vertical direction) of the leg 3. .. When hydraulic pressure is supplied through the second port 67, the piston and the lifting piston rod 62 move up. When the elevating piston rod 62 is driven upward, the movable base 70 moves upward, and accordingly, the upper lock device 50a moves upward. When hydraulic pressure is supplied through the first port 66, the piston and the elevating piston rod 62 descend. When the elevating piston rod 62 is driven downward, the movable base 70 moves downward, and accordingly, the upper lock device 50a moves downward. Therefore, the elevating cylinder device 60 moves one of the upper locking device 50a and the lower locking device 50b (illustrated in the drawing) so that the upper locking device 50a moves away from or approaches the lower locking device 50b. In the embodiment described above, the upper lock device 50a) is moved up and down.

[Platform lifting operation]
With the upper lock device 50a and the lower lock device 50b holding the legs 3 at the four corners of the platform 2, for example, the work pontoon 1 is towed to a predetermined installation point. Thereafter, at a predetermined installation point, the upper locking device 50a and the lower locking device 50a and the lower locking device 50b are engaged with each other so that the engaging pins 56 of the upper locking device 50a and the lower locking device 50b are disengaged from the engaging recesses 35 of the leg 3. Each lock piston rod 52 of the lock device 50b is driven. The legs 3 disengaged from the upper locking device 50a and the lower locking device 50b descend to the seabed 9 in an upright state by their own weight, and the leg tips 33 reach the seabed 9 at once. As a result, the work for bottoming the leg 3 can be shortened. Although it takes time, the leg 3 can also be lowered to the seabed 9 by a scale insect method described later.

  Each of the engagement pins 56 provided on the upper lock device 50a and the engagement pins 56 provided on the lower lock device 50b alternately engage with the engagement recess 35 of the leg 3, and the lifting cylinder device is provided. By expanding and contracting the lifting piston rod 62 of 60, the leg 3 can be lifted and lowered in a so-called scale insect method.

  Specifically, the engagement pin 56 of the lower lock device 50b engages with the engagement recess 35 of the leg 3, and the engagement pin 56 of the upper lock device 50a engages with the engagement recess 35 of the leg 3. Cancel the matching. In this state, the lifting piston rod 62 of the lifting cylinder device 60 is projected to lift the upper locking device 50a (movable base 70). After that, the engagement pin 56 of the upper lock device 50a engages with the engagement recess 35 of the leg 3, and the engagement pin 56 of the lower lock device 50b engages with the engagement recess 35 of the leg 3. To cancel. In this state, by retracting the lifting piston rod 62 of the lifting cylinder device 60, the lower lock device 50b (platform 2) is lifted. Then, the engagement pin 56 of the lower lock device 50b engages with the engagement recess 35 of the leg 3, whereby the leg 3 is locked and fixed to the platform 2. By alternately repeating the above operation, the platform 2 to which the lower lock device 50b is attached can be gradually raised. Also, when lowering the platform 2, the reverse operation may be performed.

  When the engagement pin 56 of the locking device 50 engages with the engagement recess 35 of the leg 3, the tapered tapered engagement convex surface 58 of the engagement pin 56 causes the engagement concave portion 35 of the engagement recess 35 to engage with the tapered taper shape. It comes into close contact with the concave surface in a circumferential shape. This increases the engagement contact area between the engagement pin 56 and the engagement recess 35, and facilitates the positioning of the engagement between the engagement pin 56 and the engagement recess 35. The lock fixing by the lock device 50 can be reliably performed. In addition, since the plurality of engaging recesses 35 are continuously formed in the longitudinal direction of the leg 3, the horizontal alignment of the platform 2 can be easily performed by slightly moving the leg 3 in the longitudinal direction (vertical direction). Can be done.

[Modification of engagement recess formed on leg]
FIG. 6 is a side view showing a modified example of the engagement recess 35 formed in the leg 3. The difference from the leg 3 described above is that the plurality of engagement recesses 35 are formed in the longitudinal direction of the leg 3 while being spaced apart from each other. The engagement recess 35 is formed, for example, with an insertion opening diameter of 500 mm, a curved portion of 100 mm, a flat portion of 200 mm, and a pitch of 800 mm.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, and various modifications can be carried out within the scope of the present invention.

  The legs 3 are not limited to four arranged at the four corners of the platform 2, and may be composed of six or eight. The height and diameter of the leg 3 can be appropriately determined according to the size of the platform 2. If the size of the platform 2 is large and the platform 2 cannot be sufficiently supported by the leg 3 alone, a pile (not shown) may be installed between the legs 3. It is also possible to replace the leg 3 with a pile while the platform 2 is supported by the leg 3 and the pile and use the replaced leg 3 for another work platform 1. At this time, a pile can be inserted and installed also in the guide hole 25 in which the leg 3 was arranged.

  The present invention and embodiments are summarized as follows.

The lifting device 4 according to one aspect of the present invention is
A lifting device 4 that enables relative movement with respect to a leg 3 that supports the platform 2,
A plurality of engaging recesses 35 are formed in the two facing engagement surfaces 31 of the leg 3 in the longitudinal direction of the leg 3,
The lifting device 4 is
A pair of locking devices 50 that drive the engagement pin 56 for locking and fixing the leg 3 to engage the engagement convex surface 58 of the engagement pin 56 with the engagement concave surface 36 of the engagement concave portion 35;
An elevating cylinder device 60 that elevates and lowers one of the pair of locking devices 50 so that the pair of locking devices 50 separates or approaches each other,
The engagement recess 35 is tapered toward the inside of the leg 3, and the engagement pin 56 is tapered toward the engagement recess 35. To do.

  According to the above configuration, the engagement pin 56 of the lock device 50 and the engagement recess 35 of the leg 3 are tapered to each other, so that they are easily and reliably engaged with each other. Therefore, the engagement between the engagement pin 56 of the lock device 50 and the engagement recess 35 of the leg 3 is stable, and the weight and cost of the leg 3 are not increased.

Further, in the lifting device 4 of one embodiment,
The plurality of engaging recesses 35 are continuously formed in the longitudinal direction of the leg 3.

  According to the above-described embodiment, since the leg 3 can be slightly moved in the longitudinal direction (vertical direction), the horizontal alignment of the platform 2 can be easily performed.

Further, in the lifting device 4 of one embodiment,
The engagement pin 56 has a substantially truncated cone shape.

  According to the above-described embodiment, the engagement pin 56 of the lock device 50 easily engages with the engagement recess 35 of the leg 3, and the engagement contact area between the engagement pin 56 and the engagement recess 35 is reduced. Since the size of the lock device 50 is increased, the lock device 50 can surely fix the lock.

Further, in the lifting device 4 of one embodiment,
The slope of the engagement convex surface 58 is larger than the slope of the engagement concave surface 36.

  According to the above-described embodiment, since the engaging convex surface 58 engages with the insertion opening portion outside the engaging concave surface 36, even if the engaging pin 56 is reduced in diameter due to wear with the engaging concave portion 35, The lock device 50 can be used for a long period of time because the lock device 50 can be press-fitted by further projecting toward the inside of the engagement recess 35.

Further, in the lifting device 4 of one embodiment,
The leg 3 has a rectangular shape, and a leg-side sliding member 39 is provided at a corner portion of the leg 3 and
A hole-side sliding member 29 is provided at a corner portion of the rectangular guide hole 25 provided on the platform 2.

  According to the above-described embodiment, the slide of the leg 3 in the guide hole 25 can be maintained for a long period of time.

Further, in the lifting device 4 of one embodiment,
The elevating device 4 is arranged so as to fit between the upper plate 21 and the bottom plate 22 of the platform 2.

  According to the above embodiment, the center of gravity of the work pontoon 1 can be lowered, and the stability of the work pontoon 1 against shaking during towing can be improved.

  In another aspect, a work platform 1 of the present invention is characterized by including the lifting device 4 according to any one of claims 1 to 6.

  In the work platform 1 of the present invention, since the engagement pin 56 of the lock device 50 and the engagement recess 35 of the leg 3 are tapered with each other, they are easily and reliably engaged with each other. Therefore, the engagement between the engagement pin 56 of the lock device 50 and the engagement recess 35 of the leg 3 is stable, and the weight and cost of the leg 3 are not increased.

1 ... Workbench
2 ... Platform 3 ... Leg 4 ... Lifting device 8 ... Sea surface 9 ... Sea bottom 21 ... Top plate 22 ... Bottom plate 23 ... Side plate 24 ... Partition plate 25 ... Guide hole 26 ... Internal space 29 ... Hole side sliding member 31 ... Engaging surface 32 ... guide surface 33 ... leg tip 35 ... engaging recess (engaged portion)
36 ... Engagement concave surface 39 ... Leg side sliding member 40 ... Elevating unit 41 ... Flange 50 ... Lock device 50a ... Upper lock device 50b ... Lower lock device 51 ... Lock cylinder 52 ... Lock piston rod 53 ... Seal structure 54 ... Seal member 55 ... Piston 56 ... Engaging pin 57 ... Pin tip 58 ... Engaging convex surface 60 ... Elevating cylinder device 61 ... Elevating cylinder 62 ... Elevating piston rod 63 ... Rod connecting member 65 ... Cylinder connecting member 66 ... First port 67 ... Second port 70 ... Movable base 71 ... Fixed base 72 ... Bracket

Claims (7)

A lifting device that enables relative movement with respect to a leg that supports a platform,
A plurality of engaging recesses are formed in the two facing surfaces of the leg in the longitudinal direction of the leg,
The lifting device is
A pair of locking devices that drive an engagement pin for locking and fixing the leg to engage an engagement convex surface of the engagement pin with an engagement concave surface of the engagement concave portion,
An elevator cylinder device that raises and lowers one of the pair of locking devices so that the pair of locking devices separates or approaches each other.
The engagement recess has a circular shape in a front view, and has a taper shape that is tapered toward the inside of the leg in a cross-sectional view, and the engagement pin has a circular shape in a front view. In addition , the lifting device has a taper shape that is tapered toward the engaging recess in a sectional view, and the engaging pin engages with the engaging recess in a circumferential shape . The lifting device according to claim 1, wherein the plurality of engaging recesses are continuously formed in the longitudinal direction of the leg while the outer peripheral portions of the adjacent engaging recesses are in contact with each other .   The lifting device according to claim 1 or 2, wherein the engagement pin has a substantially truncated cone shape.   The elevating device according to claim 3, wherein a slope of the engagement convex surface is larger than a slope of the engagement concave surface. The leg has a rectangular shape, and a leg-side sliding member is provided at a corner portion of the leg,
The lift device according to any one of claims 1 to 4, wherein a hole-side sliding member is provided at a corner portion of a rectangular guide hole provided in the platform.   The lifting device according to any one of claims 1 to 4, wherein the lifting device is arranged so as to be fitted between an upper plate and a bottom plate of the platform.   A work carrier comprising the lifting device according to any one of claims 1 to 6.

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