JP3419307B2 - Lifting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift device in which a lifter is hung up and down by a wire and can easily follow the height change of the upper support portion of the wire whose height changes. Regarding the lift device.

[0002]

2. Description of the Related Art In recent years, an all-weather temporary roof frame has been proposed as a temporary scaffold for construction of RC high-rise buildings. In this temporary roof frame, a plurality of temporary columns are erected around it according to the shape of the building to be constructed, and the temporary roof frame is supported above the temporary columns so that the height of the building frame is By raising the temporary roof frame while adding the temporary support pillars upward as the work progresses, the work can be performed without being affected by the weather. Further, an overhead crane is arranged on the lower surface of the temporary roof frame, and the material hoisted by a hoisting device is conveyed to each part through the overhead crane.

As a lifting device used for such a temporary roof frame, a lifting device is usually used, which does not have a mechanical guide post and is capable of lifting and lowering a lifter for mounting or slinging a material with a wire. As this lift device, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 5-40515 (Int.Cl.E04G 21/16),
The sheave provided on the temporary roof frame is circulated to suspend the middle portion of the wire, and the suspended portion is circulated to the sheave of the lifter to suspend the lifter in the manner of a moving pulley.

By the way, in such a lift device, it is necessary to increase the lifting height by the lifter as the above-mentioned temporary roof frame is lifted upward as the work progresses. The height change is adjusted by paying out the wire from the winch twice as long as its rising height.

[0005]

However, in such a conventional lift device, it is possible to cope with the lifting of the temporary roof frame by simply unwinding the wire from the winch. However, the lifter is suspended on the winch. The large tension when it is lowered acts directly. That is, since the lifter is suspended in the manner of a moving pulley, half of the load of this lifter acts on one end of the wire, but the load acting on one end of this wire is directly supported by the winch. Will be done.

For this reason, although the load of the lifter is half, the load when hoisting the material is extremely large. Therefore, the motor for driving the winch is required to output a large torque. Further, in recent years, it has been required to speed up the transportation of materials, which also requires higher output of the motor. However, the cost of the motor soars as a quadratic function as the output increases, so that a large cost increase is inevitable in order to meet the respective requirements.

In the meanwhile, there has been conventionally known a technique of providing a counterweight in an elevator or the like to reduce the output of the motor. That is, as shown in FIG. 10, the elevator system using this counterweight is the elevator 1
The load of the cage 1a serving as the lifter is balanced by the counterweight 2 in a slipping manner, and in this balanced state, the counterweight 2 is moved up and down by the winch 3 to raise and lower the cage 1a. Therefore, by using the counterweight 2 in this way, the output of the motor that drives the winch 3 can be significantly reduced.

Here, it is conceivable to reduce the motor output by using the counterweight in the lift device. In this case, even if an attempt is made to raise the lift height of the lifter by raising the temporary roof frame, Since the distance from the counterweight cannot be changed, as a result, the elevator technology provided with the counterweight cannot be directly applied to a lift device for an all-weather temporary roof frame.

Therefore, the present invention provides a lift device which uses a counterweight to reduce the driving force of a winch, adjust the lifting height of a lifter, and stably lift the lifter. The purpose is to do.

[0010]

In order to achieve the above object, in a lift device according to a first aspect of the present invention, a lifting device is used to lift and lower between an upper support part and a lower support part. In a lift device including a lifter that can be freely suspended, and a lift device configured to lift a load by the lifter, the lifting wire that is unwound from a lifting winch and is wound around a sheave provided in the upper support portion. , Around the sheave provided on the lifter and suspending the lifter, and connecting one end side of the lifting wire that is wound around the lifter to a counterweight, and the counterweight is connected to the lifting winch. A wire clamp is provided for locking or unlocking the other end side of the delivered lifting wire to the counterweight.

Therefore, in the lift device having such a structure, by setting the wire clamp in the locked state,
The other end side of the lifting wire is fixed to the counterweight, and one end side of the lifting wire is connected to the counterweight in advance, so that both ends of the lifting wire are fixed to the counterweight, The lifter suspended in the manner of a moving pulley by a lifting wire that circulates around the upper support and the sheave of the lifter balances with counterweights that fix both ends of the lifting wire. The other end of the lifting wire is wound around a lifting winch at a portion further extended from the portion fixed to the counterweight through the wire clamp, and the lifting wire is used to lift the lifting wire. The counter weight can be lowered or raised by winding or unwinding the other end side of the lifter, and the lifter can be raised or lowered accordingly. At this time, since the lifter is balanced with the counterweight, the load acting on the lifting winch can be remarkably reduced, and the driving source of the lifting winch can be a low output one. .

On the other hand, when changing the lifting height of the lifter, the lifting wire can be moved relative to the counterweight by unlocking the wire clamp, and the other end of the lifting wire can be moved. By rotating the lifting winch forward or backward, the lifting wire length between the lifter and the counterweight can be easily extended or shortened. Therefore, when the lifting wire length is extended, the lifting height of the lifter can be made high, while when the lifting wire length is shortened, the lifting height of the lifter can be lowered. Then, after the lifting height of the lifter is completely adjusted, the wire clamp is locked again to balance the lifter and the counterweight, and the normal lifting operation described above can be performed.

Further, in the lifting device according to the second aspect of the present invention, the wire clamp is a drum around which the lifting wire is wound, and a drum rotation blocking for blocking the rotation of the drum or releasing the blocking. And means.

As described above, since the lifting wire is wound around the drum and the rotation of the drum is blocked or released by the drum rotation blocking means, even if the brake fails, the lifting wire is lifted. The heavy wire is wound around the drum, and the rotation of the drum is also blocked by the drum rotation blocking means, which allows the lifting wire and the counterweight to move relative to each other gently while maintaining the unity. And is safe.

Further, in the lift device according to the third aspect of the present invention, the drum rotation preventing means reduces the rotation of the drum by a reduction mechanism, and the reduction mechanism is interposed between the reduction mechanism and the drum. And a mechanical lock that blocks or enables transmission of rotation.

Therefore, since a reduction mechanism for reducing the rotation of the drum is provided and a mechanical lock for preventing the rotation transmission between the reduction mechanism and the drum is provided, a gentle and large control is provided for the drum. Power can be secured.

Further, in the lift device according to a fourth aspect of the present invention, there is provided a motor which is connected to and drives the speed reduction mechanism.

As described above, since the motor is connected to the reduction mechanism to drive the drum, the lock of the lifting wire with respect to the counterweight is released to change the positional relationship between the lifting wire and the counterweight. When doing so, the drum can be driven and the lifting wire wound around this can be taken in and taken out, and the work can be facilitated.

Further, in a lift device according to a fifth aspect of the present invention, the speed reducing mechanism is constituted by a planetary gear mechanism built in the drum.

Therefore, since the reduction gear mechanism is composed of the planetary gear mechanism and built in the drum, the reduction gear mechanism can be compactly housed in the counterweight.

Furthermore, in the lift device according to a sixth aspect of the present invention, the drum rotation preventing means is arranged on the outer periphery of the winding portion of the lifting wire wound around the drum, It includes a roller chain that presses or releases the turning portion.

As described above, since the roller chain is arranged on the outer circumference of the winding portion of the lifting wire wound around the drum to press or release the winding portion, the roller chain itself. It has a function to lock the lifting wire to the counterweight and to release the lock, and also to prevent irregular winding due to loosening of the lifting wire when changing the positional relationship between the lifting wire and the counterweight. it can.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 9 show an embodiment of a lift device according to the present invention, and FIG. 1 is a front view showing the overall configuration of an overhead crane equipped with the lift device, FIG.
Is a perspective view schematically showing the overall configuration of the lift device, FIG. 3 is a front view schematically showing the overall configuration of the lift device, FIG. 5 is a side view of a cross section of a main part of the counterweight, FIG. 6 is a front view showing the inside of a wire clamp drum used in a lifting device, FIG. 7 is a side view of the wire clamp, and FIG. 8 is a mechanical view of the wire clamp. FIG. 9 is a front view showing the lock mechanism, and FIG. 9 is a sectional side view showing the inside of the wire clamp.

The lift device of this embodiment is shown to be used for hoisting materials to an overhead crane installed on a temporary roof frame of the all-weather building construction method. In this all-weather building construction method, as shown in FIG. By covering the upper part of the building frame 10 to be constructed with a temporary roof frame 12 to prevent rainwater from entering the construction site,
The temporary roof frame 12 is supported by a plurality of temporary columns 14. The temporary support columns 14 are added upward as the construction of the building frame 10 progresses to lift the temporary roof frame 12.

The overhead crane 16 is installed on the lower surface of the temporary roof frame 12. The overhead crane 16 is a transfer crane 18 attached to the center of the temporary roof frame 12.
And the construction cranes 20 and 2 located on both sides of the transportation crane 18 and mounted in parallel with the transportation crane 18.
0a and. The transport crane 18 and the built-in cranes 20 and 20a include a transport girder 22 and built-in garters 24 and 24a that run along rails, and the transport girder 22 and the built-in girders 24 and 24a are constructed with the transport girder 22. A hoist 26, which can be transferred to each other in a state where the embedded girders 24 and 24a are arranged in a straight line, is movably attached.

A lift device 30 is installed on the side of the end portion of the transfer crane 18 on the side of taking in the cargo.
The material M is lifted from the G portion on the ground to the overhead crane 16 by the lifter 32 of 0. As shown in FIG. 2, a vertical movement girder 33 is provided on the lower surface of the lifter 32. By arranging the vertical movement girder 33 on the transport girder 22 in a straight line, the hoist 26 can be transferred between the two. Has become. Therefore, with the hoist 26 positioned on the side of the lifter 32, the material M as a suspended load is hung from the ground G, and the lifter 32 is lifted to the transport crane 18 to hang the material M.
6 is transferred to the transport girder 22 described above so that the ground G
Material M can be transported to the overhead crane 16.

As shown in FIGS. 2 and 3, the lift device 30 includes a lifting wire 34 for suspending and lifting the lifter 32, and a lifting winch 36 for winding the lifting wire 34. A wire system A is provided.
A pair of the lifting wire systems A are provided corresponding to both sides of the lifter 32.

The lifting wire 34 hangs around the intermediate portion between the fixed sheaves 38, 38a, which are attached to the temporary roof frame 12 as an upper support portion at a predetermined interval, while hanging down. The portion is circulated around movable sheaves 40, 40a provided at both ends of the lifter 32, and the lifter 32 is suspended in the manner of a moving pulley. Then, both ends 34 of the lifting wire 34 that suspends the lifter 32
a and 34b are laterally pulled in one direction and the temporary roof frame 1
It circulates around the auxiliary fixed sheaves 42 and 42a attached to 2 and hangs down.

On the other hand, a counterweight 44 is provided in parallel to the side of the lifter 32 with an appropriate gap, and one end side 34a of the lifting wire 34 is connected to the counterweight 44. The other end 34b of the lifting wire 34 is attached to the counterweight 44.
After being inserted into the upper and lower through holes 44a formed in the above so as to be relatively movable, it is wound around the lifting winch 36 installed on the ground G as a lower supporting portion. The lifting winch 36 uses an electric motor (not shown) as a drive source.

The lifting wire 34 has the above-mentioned vertical through hole 44a.
The inside of the counterweight 44 that is inserted into
As shown in FIG. 5, a wire clamp 46 is provided to lock or unlock the lifting wire 34 to the counterweight 44.

Basically, the wire clamp 46 is
It comprises a drum 48 around which the lifting wire 34 is wound, and a drum rotation preventing means for preventing or canceling the rotation of the drum 48. The drum rotation preventing means includes a speed reducing mechanism that reduces the rotation of the drum 48, and a mechanical lock 56 that is interposed between the speed reducing mechanism and the drum 48 and that prevents or enables transmission of the rotation. Is configured. In the present embodiment, a planetary gear mechanism 52 built in the drum 48 is adopted as the speed reduction mechanism. A motor 54 for driving the planetary gear mechanism 52, which is a reduction mechanism, is connected to the planetary gear mechanism 52. Further, in the present embodiment, the lifting wire 34 wound around the drum 48 is used as the drum rotation preventing means.
The roller chain 50 is disposed on the outer circumference of the winding portion and presses or releases the winding portion.

Specifically, the wire clamp 46 includes a drum 48 around which the lifting wire 34 is wound, as shown in FIGS. 6 to 9, and the lifting wire 34 when the lifting wire 34 is unwound from the drum 48. A roller chain 50 that brakes, a planetary gear mechanism 52 provided in the drum 48, an electric motor 54 directly connected to the input shaft 60 of the planetary gear mechanism 52, and the rotation of the drum 48 are manually fixed, Alternatively, a mechanical lock 56 for releasing the fixation is provided.

The drum 48 is formed into a cylindrical shape having a predetermined wall thickness, and the lifting wire 34 is wound a plurality of times around the outer circumference thereof (it may be wound at least once). As shown in FIG. 6, the roller chain 50 is configured by rotatably connecting a plurality of rollers 50a via rotatable connecting plates 50b, and has a length that circulates the outer circumference of the drum 48 by about half a circumference. Equipped with. A pin 50c at one end of the roller chain 50 is pivotally attached to the casing 58, and a pin 50d at the other end is connected to a tension applying mechanism such as a cylinder device (not shown). As shown in FIG. 7, the roller chain 50 is provided with a number corresponding to the number of windings of the lifting wire 34.
4 is arranged on the outer circumference of each winding portion.

The planetary gear mechanism 52 includes the drum 48.
Of the sun gear 52a arranged at the center of the drum 48, a ring gear 52b formed on the inner circumference of the drum 48, and a pinion gear 52c meshed with the sun gear 52a and the ring gear 52b. A pair is provided facing each other. The input shaft 60 is coupled to the central shaft of the sun gear 52a, and the electric motor 54 directly connected to the input shaft 60 is supported on the casing 58 side, and the output rotation of the electric motor 54 is high via the planetary gear mechanism 52. The drum 48 is rotated at a low speed with a speed reduction ratio (about 100: 1 in this embodiment).

In the mechanical lock 56, as shown in FIG. 6, a total of four lock gears 62 are arranged on both sides of the pinion gear 52c, and the lock gears 62 mesh with the pinion gear 52c. Thus, while the rotation of the drum 48 is locked, the rotation of the drum 48 is allowed by releasing the mesh.
The lock gear 62 includes a spring 6 as shown in FIG.
2a is integrally connected to a retractable rod 62b which is biased in the protruding direction by the handle 2a.
The lock gear 62 and the pinion gear 52c are meshed with each other by engaging and retracting via the cam mechanism 66,
The mesh is released. The retractable rod 62b is slidably supported by the end plates 48a and 48b closing both ends of the drum 48, but the rotation is blocked at this sliding portion.

The cam mechanism 66 has an input bevel gear 6 rotated by the handle 64 as shown in FIG.
6a, a pair of output bevel gears 66b meshed with the input bevel gear 66a at opposing positions, a large pinion gear 66c that rotates integrally with the output bevel gears 66b, and a pair of small pinion gears 66d that mesh with the large pinion gear 66c. Camshaft 66e and these camshafts 6
A total of four cams 66f fixed to both ends of 6e are provided. These cams 66f are arranged corresponding to the positions of the retractable rods 62b, and the respective cams 6f.
6f has a relationship in which those facing each other have a phase angle of 90 °. Each cam 66f holds the corresponding retractable rod 62b at a predetermined position in balance with the biasing force of the spring 62a. At this time, since the projecting / retracting rods 62b have different phase angles of the cam 66f, the projecting / retracting relationship between the adjacent projecting / receiving rods 62b is opposite to each other. In addition, the infestation rod 6
The lock gear 62 has a pinion gear 52c near 2b.
A stopper pin 68 is provided to prevent further movement in the state of being meshed with.

According to the wire clamp 46 described above,
Since the rotation of the drum 48 around which the lifting wire 34 is wound is blocked by the locking of the mechanical lock 56 with respect to the planetary gear mechanism 52, the lifting wire 34 is wound around the drum 48 even if the brake fails. In addition, the rotation of the drum 48 is also prevented, so that the lifting wire 34 and the counterweight 44 are gently moved relative to each other while keeping the same, which is safe. Further, by combining the planetary gear mechanism 52 and the mechanical lock 56, it is possible to secure a gentle and large braking force on the drum 48.

On the other hand, the planetary gear mechanism 52 has an electric motor 54.
Since the drum 48 is driven by this, the lifting wire 34 for the counterweight 44 is connected.
When the lock of is lifted and the positional relationship between the lifting wire 34 and the counterweight 44 is changed, the drum 48 is driven by the electric motor 54 and the lifting wire 34 wound around the drum 48 is wound and unwound. Can
The work can be facilitated. Further, since the planetary gear mechanism 52 is built in the drum 48, it can be compactly housed in the counterweight 44.

Further, the roller chain 50 is connected to the drum 48.
The lifting wire 34 is wound around the winding wire 34 and is arranged on the outer circumference of the winding part to press the winding part or release the pressing.
Has a function of locking or unlocking the counterweight 44, and preventing the lock wire from loosening when the positional relation between the lifting wire 34 and the counterweight 44 is changed. You can

In the lift device 30 according to the present embodiment having the above-described structure, the wire clamp 46 provided on the counterweight 44 is locked during a normal lifting operation for lifting the lifter 32. That is, although FIG. 9 shows the unlocked state of the wire clamp 46, by rotating the handle 64 of the mechanical lock 56 from this state, the cam 66f of the cam mechanism 66 rotates and the protruding / retracting rod 62b is pushed. On the other hand, the retractable rod 62b in the pushed-in state can be projected to engage the lock gear 62 with the pinion gear 52c of the planetary gear mechanism 52. Therefore, the pinion gear 52c is prevented from rotating by meshing the lock gear 62, so that the planetary gear mechanism 52 is locked and the drum 48 is fixed. The lifting wire 34 wound around the drum 48 is pressed against the outer circumference of the drum 48 by the pressing force of the roller chain 50, and thus fixed to the counterweight 44 via the wire clamp 46.

Therefore, in this way, the wire clamp 46 is
The lifting wire 34 is fixed to the counterweight 44 by the lock of No. 4 and the lifter 32 and the counterweight 44 are balanced in this state. Then, in this balance state, the other end side 34b of the lifting wire 34, which is further extended from the counterweight 44 by the lifting winch 36, is wound or unwound to lower or raise the counterweight 44. The lifter 32 can be raised or lowered. At this time, since the lifter 32 and the counterweight 44 are balanced as described above, the load acting on the other end side 34b of the lifting wire 34 extended from the counterweight 44 to the lifting winch 36 side is extremely small. Become. Therefore, the load acting on the lifting winch 36 is remarkably reduced, and the electric motor used as the drive source of the lifting winch 36 can be of low output, and the cost can be significantly reduced. it can.

On the other hand, when the temporary support columns 14 are added to lift the temporary roof frame 12 as the work progresses, the overhead crane 16 also naturally rises, and therefore the lifter 32 is lifted.
It is necessary to raise and lower the height. When the lift height of the lifter 32 is changed as described above, the lock of the wire clamp 46 is released and the lifting wire 34 is paid out from the counterweight 44. That is, the lock of the wire clamp 46 is released by rotating the handle 64 of the mechanical lock 56 in the opposite direction to the case of the above-mentioned lock, so that the cam 66f rotates in the opposite direction and the lock gear 62 moves through the retractable rod 62b. Gear 52c
And the planet gear mechanism 52 is released from the locked state and the strong pressing force of the roller chain 50 is released.

Thus, prior to the work for unlocking the wire clamp 46, the lifter 32 is fixed to the temporary roof frame 12 to be lifted and the counterweight 44 is fixed to the ground G. Then, as the temporary roof frame 12 is lifted, the wire clamp 4
By rotating the electric motor 54 of No. 6, the speed is greatly reduced through the planetary gear mechanism 52, and the drum 48 rotates at a low speed. At the same time, by lifting the lifting wire 34 from the lifting winch 36, the lifting wire 34
Is gradually paid out from the wire clamp 46 to lengthen the lifting wire 34 between the counterweight 44 and the lifter 32. At this time, the roller chain 50
The lifting wire 34 is lightly pressed to the outside of the portion wound on the drum 48.

Therefore, when the lifting wire 34 is unwound from the wire clamp 46, a light pressing force of the roller chain 50 acts to generate a frictional force between the roller chain 50 and the lifting wire 34. As a result, the lifting wire 34 is fed while being braked. Therefore, coupled with the fact that the drum 48 itself rotates at a low speed, it is possible to prevent the lifting wire 34 from loosening and prevent it from being unwound from the drum 48. Further, the roller chain 50 can also serve as a guide for the portion where the lifting wire 34 is wound around the drum 48.

As shown in FIG. 1, the counterweight 44 is provided with a counterweight auxiliary post 70 beside one of the temporary columns 14, and the auxiliary post 70 covers the counterweight 44. Is desirable. The auxiliary post 70 is the temporary post 14 described above.
It is possible to use a jib crane (not shown) installed on the upper side of the temporary roof frame 12 as the auxiliary post 70 by adding bolts to the temporary columns 14 via bolts.

By the way, in this embodiment, the wire clamp 46 is provided with the planetary gear mechanism 52 to rotate the drum 48 at a low speed, and the lifting wire 34 is gradually fed out. However, the present invention is not limited to this. Heavy wire 3
With other means to secure the required tension of 4,
The other end 34b of the lifting wire 34 may be fixed to the counterweight 44, or a structure capable of releasing the fixation may be provided. Further, the lift device 10 of the present embodiment is provided with a stabilizer wire system for exclusively guiding the lifting and lowering of the lifter 32 in addition to the lifting wire system A by the lifting wire 34 for lifting and lowering the lifter 32. desirable.

[0047]

As described above, in the lift device according to the first aspect of the present invention, one end of the lifting wire is connected to the counterweight that balances with the lifter, and the lifting wire of the lifting wire is connected. The other end side is movably arranged relative to the counterweight and wound around a lifting winch. Since a wire clamp is provided between the other end side of the lifting wire and the counterweight, the wire clamp is locked. By setting the state, the other end side of the lifting wire can be fixed to the counterweight and the lifter and the counterweight can be balanced, so that the load acting on the lifting winch can be significantly reduced. On the other hand, as the lifting of the lifting wire can be allowed by unlocking the wire clamp, the lifting wire length between the lifter and the counterweight can be easily adjusted, and the lifting height of the lifter can be adjusted. Can be changed easily. Therefore, the present invention can be applied to a lift device in which the distance between the upper support portion and the lower support portion is changed, and its effect can be significantly increased including economical efficiency.

Further, in the lifting device according to the second aspect of the present invention, the lifting wire is wound around the drum, and the rotation of the drum is blocked by the drum rotation blocking means, or the blocking is prevented. Since the lifting wire is released, even if the brake fails, the lifting wire is wound around the drum, and the drum is also prevented from rotating by the drum rotation blocking means. Is safe because it makes relative movements while maintaining unity.

Further, in the lift device according to claim 3 of the present invention, the mechanical lock is provided with a speed reducing mechanism for speeding down the rotation of the drum, and for preventing rotation transmission between the speed reducing mechanism and the drum. Since it is provided with, it is possible to secure a gentle and large braking force for the drum.

Further, in the lift device according to the fourth aspect of the present invention, since the motor is connected to the speed reducing mechanism to drive the drum, the lock of the lifting wire with respect to the counterweight is released. When the positional relationship between the lifting wire and the counterweight is changed, the drum can be driven and the lifting wire wound around the drum can be wound and unwound, which facilitates the work.

Further, in the lift device according to the fifth aspect of the present invention, since the reduction gear mechanism is composed of the planetary gear mechanism and is built in the drum, the reduction gear mechanism can be compactly housed in the counterweight. it can.

Further, in the lift device according to the sixth aspect of the present invention, the roller chain is arranged on the outer periphery of the winding portion of the lifting wire wound around the drum and presses the winding portion. Since it has a function of locking the lifting wire itself to the counterweight and releasing the lock, it also changes the positional relationship between the lifting wire and the counterweight. It is possible to prevent irregular winding due to loosening of the lifting wire.

[Brief description of drawings]

FIG. 1 is a front view showing the overall configuration of an overhead crane provided with a lift device according to the present invention.

FIG. 2 is a perspective view schematically showing an overall configuration of an embodiment of a lift device according to the present invention.

FIG. 3 is a front view schematically showing the overall configuration of the lift device shown in FIG.

FIG. 4 is a front view in which a main part of a counterweight used in the lift device of FIG. 2 is sectioned.

5 is a side view showing a cross section of a main part of the counterweight shown in FIG. 4. FIG.

FIG. 6 is a front view showing the inside of the drum of the wire clamp used in the lift device of FIG.

7 is a side view of the wire clamp of FIG.

FIG. 8 is a front view showing a mechanical lock mechanism of the wire clamp shown in FIG.

9 is a cross-sectional side view showing the inside of the wire clamp of FIG.

FIG. 10 is a front view schematically showing the overall configuration of a conventional lift device.

[Explanation of symbols]

10 building frame 12 Temporary roof frame 30 lift device 32 lifters 34 Lifting wire 36 Lifting winch 38, 38a Fixed sheave 40,40a movable sheave 46 wire clamp 48 drums 50 roller chain 52 Planetary gear mechanism 54 electric motor 56 mechanical lock G ground M materials

Front Page Continuation (72) Inventor Yasumuni Uemura 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) Reference JP-A-4-191276 (JP, A) JP-A-8-338136 (JP, A) JP-A-8-199822 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B66F 7/02 B66B 9/187

Claims (6)

(57) [Claims] 1. A lift device comprising a lifter hung between a upper support part and a lower support part so as to be able to move up and down via a lifting wire, wherein the lifter lifts a load. The lifting wire unwound from a lifting winch and wound around a sheave provided in the upper support part is hung around the sheave provided in the lifter to suspend the lifter, and the lifting is made to go around the lifter. A wire that connects one end side of a heavy wire to a counterweight, and locks or unlocks the other end side of the lifting wire fed from the lifting winch to the counterweight. A lift device characterized by having a clamp. 2. The wire clamp according to claim 1, further comprising: a drum around which the lifting wire is wound, and a drum rotation preventing unit that prevents rotation of the drum or cancels the rotation. Lift device. 3. The drum rotation preventing means is provided between a speed reducing mechanism for reducing the rotation of the drum and a mechanical mechanism for preventing or enabling transmission of rotation, which is interposed between the speed reducing mechanism and the drum. The lift device according to claim 2, further comprising a lock. 4. The lift device according to claim 3, further comprising a motor that is connected to the deceleration mechanism and drives the deceleration mechanism. 5. The deceleration mechanism is a planetary gear mechanism built in the drum.
The lift device according to any one of items. 6. The drum rotation preventing means includes a roller chain which is arranged on the outer circumference of a winding portion of the lifting wire wound around the drum and presses or releases the winding portion. 3. The method according to claim 2,
~ The lifting device according to any one of 5 to 5.