JPH1179699A - Elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator capable of using safely by surely preventing a working bench from falling down when a wire is cut out, with a simple mechanism. SOLUTION: An elevator is provided with a strut 2 erected vertically, a working bench 1 which is elevatably connected to the strut 2, a winch 5 for lifting up the working bench 1 along the strut 2 by winding up a wire 4 connected to an upper end of the strut 2, and a safety mechanism 6 for stopping the working bench 1 when the wire 4 is cut out. The safety mechanism 6 is provided with a tension guide 18, a connecting rod 19, and a brake 20. The tension guide 18 is push-pressed to the wire 4 tensed with the rod of the working bench 1 by an elastic body 23, and is connected to the brake 20 through the connecting rod 19. When the wire 4 is cut out and tension is eliminated, displacement of the tension guide 18 is transmitted to the brake 20 through the connecting rod 19, the strut 2 is held and fixed by the brake 20, and thereby, it is possible to prevent the working bench 1 from falling down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator mainly used for pruning and pruning trees, maintenance of electric poles, and the like.

[0002]

2. Description of the Related Art An electric pole is regularly inspected by workers climbing for maintenance. Electric poles fix the rods that serve as scaffolds horizontally at regular intervals. However, there is no rod below the pole. This is because it is dangerous if something other than the worker rises. For this reason, it is necessary to use a ladder, an elevator mounted on an automobile, or the like in order to ascend to the rod serving as a scaffold.

[0003] In addition, large trees can be pruned at high points from the ground and cannot be pruned.
A tripod ladder is used. The ladder cannot be stabilized independently unless the base is widened in proportion to the height. For this reason, there is a drawback that if there is a tree trunk, a branch, or the like in the surroundings, it becomes an obstacle and cannot be installed at a place where the user thinks. In addition, since it becomes unstable when it becomes high, for example, pruning of a high portion of 3 meters or more has a disadvantage that it cannot be used safely. For this reason, tall trees require scaffolding around them to be pruned. This method has a disadvantage in that extra work is required for assembling the scaffold, and the tree cannot be pruned efficiently.

[0004]

Although the ladder can be made simple and light, it has a drawback that it cannot work stably. In particular, it becomes unstable when it gets high, and it is easy to fall down. A work vehicle equipped with an elevator that can be moved up and down by hydraulic pressure on the bed of an automobile can work safely. However, this work vehicle has a disadvantage that it cannot be conveniently moved to a narrow place. There is also a disadvantage of high cost.

The inventor of the present invention has developed an elevator shown in FIG. 1 in order to solve such a disadvantage. The elevator includes a column 2 that stands vertically adjacent to a tree K or a telephone pole, a connecting tool 3 that connects the middle of the column 2 to the tree K, and a work table 1 that is connected to the column 2 so as to be able to move up and down. , This workbench 1
And a winch 5 for winding the wire 4 connected to the upper end of the column 2 and raising the work table 1 along the column 2. This elevator lifts the wire 4 with the winch 5 on the work table 1 and raises the work table 1 along the column 2.

[0006] The elevator having this structure has a feature that the entire structure can be simplified and the weight can be reduced. However, this elevator
Since there is no safety device, if the wire breaks,
There is a dangerous disadvantage that the workbench falls. The present invention has been developed with the aim of further solving this drawback.An important object of the present invention is to prevent the drop of the worktable reliably when the wire is cut by a simple mechanism, An object of the present invention is to provide an elevator that can be used safely.

[0007]

According to the present invention, there is provided an elevator, comprising: a column (2) that stands vertically adjacent to a tree or a telephone pole (D);
A worktable 1 connected so as to be able to ascend and descend, and a winch 5 that winds a wire 4 attached to the worktable 1 and connected to an upper end of a support 2 to raise the worktable 1 along the support 2. And a safety mechanism 6 for stopping the work table 1 when the wire 4 is broken. Winch 5 on work table 1
Then, the wire 4 is wound up, and the work table 1 is moved up along the column 2.

Further, the safety mechanism 6 mounted on the elevator according to the present invention includes a tension guide 18, a connecting rod 19, and a brake 20 to prevent the work table 1 from dropping when the wire 4 is cut. . Tension guide 1
8 is a wire 4 pulled by the load of the work table 1
Are elastically pressed through the elastic body 23. Further, the tension guide 18 is mounted on the work table 1 so as to be moved by the magnitude of the tension of the wire 4. The connecting rod 19 moves the tension guide 18 so that the brake 20 is operated by the displacement of the tension guide 18.
Is connected to the brake 20. The brakes 20 are located on both sides of the column 2 and mounted on the work table 1 so that the distance from the surface of the column 2 can be changed.

In this elevator, the tension guide 18 is moved by the tension of the wire 4. The displacement of the tension guide 18 is transmitted to the brake 20 via the connecting rod 19. When the wire 4 is cut and the tension is lost, the tension guide 18 is displaced, and the brake 20 clamps the column 2 to prevent the work table 1 from falling.

The elevator according to the second aspect of the present invention is configured such that the parallel link 27 moves so as to move in parallel with the surface of the column 2.
The brake 20 is constituted by the brake plate 28 connected to the work table 1 through the brake. The parallel link 27 is inclined downward from the work table 1 and connected to the brake plate 28.

According to a third aspect of the present invention, the connecting rod 19 is branched into an inverted V-shape and has a lower end connected to a brake plate 28 and an upper end of the branch rod 21. An L-shaped rod 22 is provided. The L-shaped rod 22 has the upper end connected to the tension guide 18 and the other end connected to the branch rod 21.

[0012] The elevator of the present invention, in a normal use state,
The tension guide 18 pushes the tension guide 18 in the direction opposite to the elastic body 23 by the tension of the wire 4. When the tension guide 18 is in this position, the brake 20 does not pinch the column 2. When the wire 4 is cut and the tension is lost, the tension guide 18 is pushed by the elastic body 23 and moves. When the tension guide 18 moves, the displacement is transmitted to the brake 20 via the connecting rod 19, and the brake 20 clamps the column 2 and prevents the work table 1 from falling.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify a lift for embodying the technical idea of the present invention, and the present invention does not specify the lift as follows.

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims” and “ In the column of “means”. However, the members described in the claims are not limited to the members of the embodiments.

The perspective view of FIG. 2, the side view of FIG. 3, and the horizontal sectional view of FIG. 4 show a specific example in which an elevator is used for a utility pole D. However, the elevator according to the present invention is not necessarily used for utility poles, but may be used adjacent to trees, buildings, scaffolds, and the like. The elevators shown in these figures are:
A column 2 that stands vertically adjacent to the telephone pole D, a connector 3 that connects the middle of the column 2 to the telephone pole D, a work table 1 that is connected to the column 2 so as to be able to move up and down, and a work table 1 A winch 5 that winds the wire 4 attached and connected to the upper end of the column 2 and raises the worktable 1 along the column 2.
And a safety mechanism 6 for stopping the work table 1 when the wire 4 is cut.

The column 2 is a square pipe made of metal and has a projection 7A projecting from the lower end thereof so as not to slip.
The projection 7A is provided by fixing the plate 7 to the lower end of the column 2 and bending the corner of the plate 7 downward. Prop 2
Has a total length of, for example, 3 to 8 meters, preferably 4 to 8 meters.
8 meters, more preferably 5 to 7 meters.
If the support 2 is made high, it can be used for high utility poles D, trees, etc., but the overall weight becomes heavy. The overall length of the column 2 is determined to be an optimum length in consideration of the overall weight and the height of the utility pole D to be used. Although not shown, the struts are extended vertically and ribs are provided to increase the bending strength. The pillars with ribs have the feature that they can be thin and light, and reduce deflection.

The column 2 is connected to a utility pole D via a connector 3. The support pole 2 is connected to the utility pole D so as to be parallel to the utility pole D and perpendicular to the ground. As shown in FIG. 4, the connecting tool 3 includes a connecting plate 8 connected to the column 2, a stay 9 abutting on the utility pole D, and a chain 10 for fastening the stay 9 to the utility pole D. The connecting plate 8 is bent at a right angle, and the bent surface is fixed by abutting the corner of the column 2. The connecting plate 8 is fixed at a corner approaching the utility pole D so as not to hinder the movement of the workbench 1.
In this way, the power pole D
The connecting tool 3 has a feature that the work table 1 can be moved from the lowermost part to the uppermost part of the column 2. The connecting plate 8 and the stay 9 are fixed by welding or the like, and maintain the utility pole D and the support pole 2 at a constant interval.

The stay 9 is a V-shaped metal plate. The V-groove is brought into contact with the utility pole D, and the chain 10 is tightened to be connected to the utility pole D. The stay 9 has, at one end, a plate 12 that connects an eyebolt 11 to which the chain 10 is connected, and at the other end, a hook 13 that hooks a ring of the chain 10. Eye bolt 11
It is inserted into the through hole of the plate 12 and tightened by the nut 14. The connecting tool 3 of this structure winds the chain 10 along the outer circumference of the utility pole D with the nut 14 loosened, and hooks the ring of the chain 10 on the hook 13 at the tip of the stay 9. Then, tighten the nut 14,
The stay 9 is fastened to the utility pole D. Thus, the chain 10
The connecting tool 3 tightened via the connector has a feature that the connecting tool 3 can be easily and reliably connected even if the poles are slightly different in thickness.

The connecting member 3 preferably connects a plurality of intermediate portions of the column 2 to the utility pole D as shown in FIGS. As described above, the pillar 2 having a plurality of portions connected to the utility pole D
Is connected to the utility pole D at a predetermined interval, and can be held in a state where the support column 2 stands upright so as not to fall down. The number of locations where the support 2 is connected to the utility pole D is determined to be an optimum value by the length of the support 2. For example, two columns are fixed to the pole when the total length is short, and three or more columns are fixed to the pole when the total length is long. First, the pole 2 to which a plurality of portions are connected is connected vertically to the utility pole D with the lowermost one of the connecting tools 3 fixed to the pole 2 in a state of standing vertically adjacent to the utility pole D. This connecting tool 3 is mounted at a height of, for example, 1.5 to 2 m so that it can be mounted from the ground. Next, raise the work table 1,
The second connector 3 is connected to the utility pole D. This operation is repeated to connect the plurality of connecting tools 3 to the utility pole D at predetermined intervals.

The work table 1 is provided with a support 2
It has a set of wheels 15. One of the two wheels 15 is mounted on the upper part of the worktable 1 and the other is mounted on the lower part of the worktable 1.
One set of wheels 15 rolls with the support 2 interposed therebetween. Wheel 15
Has a V-groove perpendicular to the rolling surface on the outer periphery. This wheel 15
As shown in FIG. 4, the column 2 rotates while holding the column 2 of the square pipe from both sides. The wheels 15 of this structure prevent the worktable 1 from rotating in a horizontal plane, and move the worktable 1 up and down along the column 2.

The work table 1 has a handrail 1B disposed above a horizontal table 1A on which an operator rides. The horizontal base 1A is a circular flat plate having sufficient strength so as not to be deformed even when an operator gets on it, and has a back surface reinforced with a rod or the like (not shown). The horizontal base may be formed in such a manner that a plurality of rods are connected in parallel at a constant pitch so as not to step off the foot.
The handrail 1B is formed in an annular shape having substantially the same outer shape as the horizontal table 1A in order to prevent the worker from dropping from the work table 1. The horizontal platform and handrail can also be formed into a square shape. The horizontal base 1A and the handrail 1B are connected by a vertical rod 1C.

Further, the handrail 1B is structured so that a part thereof can be opened and closed so that an operator can go in and out.
In the handrail 1B shown in FIG. 4, a semicircular portion located on the opposite side to the support 2 is an opening / closing portion 1D. The handrail 1B has one end of a semicircular opening / closing portion 1D fixed to the main body side of the handrail 1B via a rotation shaft 32. In addition, handrail 1B that can be opened and closed
Is provided with a lock mechanism 33 so that the opening / closing section 1D of the handrail 1B does not open during work on the worktable 1.

As shown in FIG. 5, the lock mechanism 33 includes a fixing ring 34 fixed to the end of the opening / closing portion 1D of the handrail 1B.
And a locking piece 35 fixed to the tip of the handrail 1B on the main body side, facing the fixing ring 34, and a rotating plate 36 for connecting these. The rotating plate 36 has a slit 36 </ b> A at the center, and has a structure capable of rotating along a fixing ring 34 penetrating the slit 36. The handrail 1B is closed by closing the opening / closing section 1D and inserting the slit 36A of the rotating plate 36 into the locking piece 35. At this time, when the detachable hook 37 is inserted into the through hole 35A of the locking piece 35, the opening / closing portion 1D is locked and held in the closed state, so that the worker can work safely. Further, the lock mechanism can be various mechanisms capable of holding the opening / closing unit in a closed state.

The horizontal base 1A and the handrail 1B are provided with the arm 16 protruding in the direction of the column 2 and the vertical frame 17 is welded and fixed to the tip of the arm 16 vertically.
7 is equipped with wheels 15.

The winch 5 is fixed on an arm 16 connected to the handrail 1B. The winch 5 raises the work table 1 by winding up the wire 4 connected to the upper end of the column 2. The winch 5 shown in FIGS.
A and a drum 5B that is rotated by the handle 5A and winds up the wire 4. The rotating shaft of the handle 5A is connected to the drum 5B via a gear (not shown). The winch 5 has a built-in brake mechanism (not shown), and can rotate the handle 5A to rotate the drum 5B. However, even if the wire 4 wound around the drum 5B is pulled, the drum 5B is not rotated. For this reason, the handle 5A is rotated, the wire 4 is wound on the drum 5B, the work table 1 is raised along the column 2, and the handle 5A is reversed, and the wound wire 4 is fed out. The platform 1 can be lowered. The work table 1 is stopped at a predetermined height without rotating the handle 5A.

The safety mechanism 6 prevents the work table 1 from dropping when the wire 4 is cut.
8, a connecting rod 19 and a brake 20. FIG.
The safety mechanism 6 shown in FIG.
Rod 21 connected to the tension guide 1
8 is connected to an L-shaped rod 22.

The tension guide 18 is elastically pressed through the elastic body 23 by the wire 4 which is pulled by the load of the work table 1. In addition, tension guide 1
Reference numeral 8 is attached to the work table 1 via an L-shaped rod 22 so as to be moved by the magnitude of the tension of the wire 4. The tension guide 18 in the figure is a roller, and is mounted on the upper end of the L-shaped rod 22 with the rotation axis being horizontal. The roller serving as the tension guide 18 is disposed on the movement locus of the tensioned wire 4 and rolls by contacting the wire 4 when the wire 4 moves.

When the wire 4 is under tension, the tension guide 18 is at the position indicated by the solid line in FIG. When the wire 4 is cut, the tension guide 18 is pulled by the elastic body 23 and moves to a position indicated by a chain line. In order to arrange the tension guide 18 in a fixed position when a predetermined tension is acting on the wire 4, in other words, when the wire 4 is wound by the winch 5, the tension guide 18 comes into contact with the tension guide 18 of the wire 4. A wire guide is provided between the tension guide 18 and the winch 5 so that the position does not move. The wire guide is
Any mechanism that can arrange the wire 4 at a fixed position can be adopted. The illustrated wire guide is a guide hole 24 opened in a metal plate fixed to the winch 5. The guide hole 24 is provided with a material having a small frictional resistance, for example, a plastic 25 such as a fluororesin, on the periphery thereof so that the wire 4 can pass through the wire 4 with a low resistance. Although not shown, the wire guide may be a mechanism for passing the wire between the two rollers.

The L-shaped rod 22, which is the connecting rod 19,
The tension guide 18 is operated via the branch rod 21 so that the brake 20 is operated by the displacement of the tension guide 18.
Is connected to the brake 20. The L-shaped rod 22 is mounted on the winch 5 via a rotating shaft inserted through a bent portion so that the L-shaped rod 22 can rotate in a vertical plane. The L-shaped rod 22 shown in FIGS. 5 and 6 has two arms fixed to both ends of the pipe by welding or the like so as to be substantially perpendicular to each other, and rotates through a rotary shaft inserted through the pipe. It is attached to winch 5 so that it can be done. The L-shaped rod 22 is shown in FIG.
As shown in (1), the end connected to the branch rod 21 is disposed at the center of the support column 2 so that the two brakes 20 can be moved up and down in a well-balanced manner via the branch rod 21.

The branch rod 21 has an L-shaped rod 22 at the upper end.
, And the lower end is connected to the brake 20.
Both ends of the branch rod 21 are connected to the L-shaped rod 22 and the brake 20 so as to be rotatable via pins in a horizontal posture.

The elastic body 23 is a tension spring connected to the upper end of the L-shaped rod 22 and a metal plate having a guide hole 24 so as to elastically press the tension guide 18 against the wire 4. As the elastic body 23, any mechanism that elastically presses the tension guide 18 against the wire 4 can be used, for example, a coil spring or the like in which a rotation shaft of an L-shaped rod is inserted. The coil spring has one end connected to the L-shaped rod and the other end connected to the winch, and rotates the L-shaped rod rightward in FIG.

Further, in this specification, the elastic body is used in a broad sense including a mechanism for pressing a tension guide against a wire by gravity. In order to cause the tension guide to be pressed against the wire by gravity, for example, as shown by a chain line in FIG. 6, a structure in which an arm fixing the weight 26 at the tip end may be connected to the L-shaped rod 22. The weight 26 presses the tension guide 18 against the wire 4 by gravity.

As shown in FIGS. 6 and 7, the brake 20 is translated so as to be parallel to the surface of the column 2.
It has a brake plate 28 connected to the workbench 1 via parallel links 27. The brake plate 28 has a non-slip material 29 such as rubber fixed to a contact surface with the support 2 to increase frictional resistance with the support 2. Brake plate 28 is working table 1
Is proportional to the product of the coefficient of friction between the brake plate 28 and the column 2 and the pressing force. Therefore, when the brake plate 28 is made of a material having a large frictional resistance, in other words, using a difficult-to-slip material 29 having a large coefficient of friction, the work table 1 can be stopped more reliably. The difficult-to-slip material may be a material used for a brake of an automobile.

The brake plate 28 is formed in a V-shape along the surface of the column 2, and the slip resistant material 29 is fixed to the surface. This brake plate 28 is connected to the vertical frame 17 of the worktable 1 via two rows of parallel links 27. The parallel link 27 is connected to a brake plate 28 and a connection plate 30 fixed to the vertical frame 17 via a pin in a horizontal posture so as to be tiltable in a vertical plane.
The parallel link 27 presses the brake plate 28 more strongly against the surface of the column 2 when the wire 4 is cut,
The work table 1 is connected to the brake plate 27 in a posture inclined downward from the connection plate 30 of the vertical frame 17. The parallel link 27 in this position is pressed more strongly against the surface of the column 2 as the brake plate 28 is raised.

The above elevator uses a brake plate 28 that moves parallel to the brake 20. Brake 2 of this structure
0 does not damage the surface of the column 2 when the wire 4 is cut. In particular, there is a feature that deformation can be reliably prevented by using a deformable metal such as aluminum for the column 2. The elevator of the present invention does not specify the brake on the brake plate. For the brake, for example, a cam 31 shown in FIG. 8 can be used. The cam 31 in this figure has both ends connected to the vertical frame 17 via pins in the figure, and the branch rod 21 is connected inside. In the state where the branch rod 21 is pushing down the cam 31, in other words, in the state where the wire 4 is not cut, the cam 31 is
Away from the surface. When the wire 4 is cut and the branch rod 21 is pushed up, the cam 31 rotates and the support 2
To prevent the workbench 1 from falling. In the brake 20 having this structure, the cam 31 strongly presses the surface of the support column 2 locally to stop the work table 1 reliably. This brake 20 can stop the work table 1 reliably,
However, there is a disadvantage that the brake 20 easily deforms.

The elevator having the above structure operates as follows.
Prevents the platform from falling when the wire breaks.

[When Predetermined Tension is Acting Without Breaking Wire] The wire 4 pushes the tension guide 18 to rotate the L-shaped rod 22 to the left. The L-shaped rod 22 at this position separates the brake plate 28 from the column 2 with the branch rod 21 pushed down. Therefore, the work table 1 can freely move up and down along the column 2.

[When the Wire Breaks and the Tension Stops Working] The L-shaped rod 22 is rotated rightward by the elastic body 23. This is because the wire 4 does not press the tension guide 18. The L-shaped rod 22 rotated right raises the branch rod 21. The raised branch rod 21 presses the brake plate 28 against the surface of the column 2. When the brake plate 28 is pressed against the surface of the column 2, the brake plate 28 does not slip on the column 2, and the work table 1 is stopped so as not to drop from the column 2.

[0039]

The elevator according to the present invention has a feature that, with a simple mechanism, the work table can be securely prevented from dropping when the wire breaks, and can be used safely. That is, the elevator of the present invention is provided with a safety mechanism, and this safety mechanism is connected to a tension guide displaced by the tension of the wire via a connecting rod, and brakes located on both sides of the column. This is because when the wire is cut and the tension is lost, the tension guide is displaced, and the brake clamps the column, thereby preventing the work table from falling. In the elevator of the present invention, in a normal use state, the tension guide is displaced by the tension of the wire so that the brake does not pinch the support.
When the wire is cut and the tension is lost, the tension guide is displaced so that the brake clamps the support and prevents the work table from falling. As described above, the elevator according to the present invention transmits the displacement of the tension guide, which is moved by the tension of the wire, to the brake to prevent the work table from falling, so that the wire can be cut with an extremely simple mechanism and reliably. The brake can be operated by detecting that the operation has been performed. Therefore, in addition to being able to move the worktable up and down and work conveniently, the elevator of the present invention can reliably prevent the worktable from dropping when the wire breaks, thereby enabling the worker to work safely. There are features that can be done. Moreover, the elevator according to the present invention does not require a large and complicated mechanism for the safety mechanism, and thus has a feature that it can be manufactured lightly and inexpensively.

Further, in the lift according to the second aspect of the present invention, the brake is constituted by a brake plate connected to the work table via a parallel link, and the brake plate is translated in a posture parallel to the surface of the column. I have to. The brake of this structure has a feature that the parallel-moving brake plate comes into contact with the support on the surface, and the friction of the contact surface is increased so that the work table can be stopped reliably. Further, the brake plate that comes into contact with the support by surface can reduce damage and deformation of the support, and thus has a feature that can be used for a long time.

Further, in the elevator according to the second aspect of the present invention, the parallel link is inclined downward from the worktable and connected to the brake plate. The parallel link connecting the brake plates in this position presses the brake plate more strongly against the surface of the column as the brake plate is raised. For this reason, there is a feature that the frictional force between the brake plate and the strut is increased, and the work table can be reliably stopped to prevent the work table from dropping.

Further, according to the third aspect of the present invention, the connecting rod is formed by branching the connecting rod into an inverted V-shape and connecting the lower end to the brake plate, and the L-shape connected to the upper end of the branch rod. It consists of a rod. As described above, the branch rod branched into an inverted V shape has a feature that the two brake plates connected to the respective lower ends can be moved up and down in a well-balanced manner. For this reason, the elevator having this structure has a feature that, when the tension of the wire is lost, the branch rod makes the two brake plates contact the support column in a well-balanced manner, so that the drop of the worktable can be reliably prevented. Also, when the wire tension is working, the branch rod keeps the two brake plates away from the surface of the support column so that they do not contact the support column. There is a feature that can be moved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of an elevator developed earlier by the present inventors.

FIG. 2 is a schematic perspective view showing a use state of the elevator according to the embodiment of the present invention.

FIG. 3 is a side view of the elevator according to the embodiment of the present invention.

FIG. 4 is a horizontal sectional view of the elevator shown in FIG. 3;

FIG. 5 is an enlarged side view of a work table of the elevator shown in FIG. 3;

FIG. 6 is a partial sectional front view showing a safety mechanism of the work table shown in FIG. 5;

FIG. 7 is a horizontal sectional view of the brake of the safety mechanism shown in FIG. 6;

FIG. 8 is a partial sectional front view showing another example of the brake;

[Explanation of symbols]

1: Work table 1A: Horizontal table
1B… Handrail 1C… Vertical rod 1D… Opening / closing part 2… Post 3… Connector 4… Wire 5… Winch 5A… Handle
5B ... Drum 6 ... Safety mechanism 7 ... Plate 7A ... Protrusion 8 ... Connecting plate 9 ... Stay 10 ... Chain 11 ... Eyebolt 12 ... Plate 13 ... Hook 14 ... Nut 15 ... Wheel 16 ... Arm 17 ... Vertical frame 18 ... Tension guide DESCRIPTION OF SYMBOLS 19 ... Connecting rod 20 ... Brake 21 ... Branch rod 22 ... L-shaped rod 23 ... Elastic body 24 ... Guide hole 25 ... Plastic 26 ... Weight 27 ... Parallel link 28 ... Brake plate 29 ... Slip resistant material 30 ... Connecting plate 31 ... Cam 32 ... Rotating shaft 33 ... Lock mechanism 34 ... Fixing ring 35 ... Locking piece 35A ... Through hole 36 ... Rotating plate 36A ... Slit 37 ... Removable hook K ... Tree D ... Pole

Claims (3)

[Claims] 1. A column (2) that stands upright, a work table (1) connected to the column (2) so as to be able to move up and down, and this work table
Wire attached to (1) and connected to the upper end of column (2)
Take up (4), winch (5) that raises the work platform (1) along the column (2), and work platform when the wire (4) is cut
It is equipped with a safety mechanism (6) for stopping (1), winds the wire (4) with the winch (5) on the work table (1), and
Is lifted along the column (2), and the safety mechanism (6) is connected to the wire (4) pulled by the load of the worktable (1) with an elastic body (23). Pressed and wire
Work table (1) to be moved with the size of the tension of (4)
A tension guide (18) mounted on the support (2) is connected to the tension guide (18) via a connecting rod (19), and is located on both sides of the support (2). It has a brake (20) attached to the worktable (1) so that the distance can be changed, the tension guide (18) moves by the tension of the wire (4), and the displacement of the tension guide (18) is When transmitted to the brake (20) via the (19) and the wire (4) is cut and the tension is lost, the tension guide (18) is displaced, and the brake (20) clamps the support (2), An elevator configured to prevent the work table (1) from falling. 2. A brake plate (28) connected to a work table (1) via a parallel link (27) so that a brake (20) translates in a posture parallel to a surface of a column (2). The elevator according to claim 1, further comprising a parallel link (27) connected to the brake plate (28) in a posture inclined downward from the work table (1). 3. A branch rod (21) having a connecting rod (19) branched in an inverted V-shape and having a lower end connected to a brake plate (28).
And an L-shaped rod connected to the upper end of this branch rod (21)
The elevator according to claim 2, further comprising (22), wherein the L-shaped rod (22) has the upper end connected to the tension guide (18) and the other end connected to the branch rod (21).