JP4335415B2 - Telescopic mechanism and working scaffold provided with the telescopic mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an expansion / contraction mechanism in which a movable member is slidably mounted along a guide portion formed in a base member, and a working scaffold such as a ladder, a stepladder, or a work table provided with the expansion / contraction mechanism. .
[0002]
[Prior art]
Conventionally, as this type of expansion and contraction mechanism, as shown in Japanese Patent Application Laid-Open No. 7-247777, an upper ladder and a lower ladder having a pair of left and right pedestals provided with a lifting rail are provided by an operating rope. There was one that was adopted for a telescopic ladder that slidably expands and contracts with each other.
[0003]
This is because the operating rope is fixed to the lower ladder at both ends, and is again engaged with the roller provided on the lower ladder via the roller provided on the upper ladder to move the operating rope. Thus, the roller of the upper ladder moves integrally with the upper ladder in a state where the operating rope is always tensioned.
[0004]
[Problems to be solved by the invention]
However, the telescopic ladder employing the above-described conventional telescopic mechanism requires an operating rope to pass between the upper and lower ladder columns, and as shown in FIG. At the same time, since the outer dimension D ′ of the pulley mounting bracket 200 and the like becomes large, the portion through which the rope passes is widened, resulting in an increase in the size of the ladder, which is disadvantageous in terms of transportation and use. It was. In the figure, 300 is a rope, and 400 is a rotation axis of the pulley 100.
[0005]
Further, from the above, since the diameter of the rope 300 itself cannot be increased any more, it is difficult to grip and there is a problem in operability.
[0006]
An object of the present invention is to provide a telescopic mechanism capable of solving the above-described problems and a working scaffold including the telescopic mechanism.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention according to claim 1, the first movable member is slidably mounted along the guide portion formed on the base member, and pulleys are disposed on both members. , A rope is passed between the members via a pulley, and by pulling the rope, the first movable member can be reciprocated to expand and contract, and a guide portion is formed on the first movable member, A second movable member is slidably mounted along the guide portion, and a flat belt is stretched across the base member, the first movable member, and the second movable member. The second movable member is configured to be capable of reciprocating sliding in conjunction with the reciprocating sliding of the movable member.
[0013]
Moreover, in this invention of Claim 2 , the start end and termination | terminus of a rope were connected with the 1st movable member.
[0014]
Furthermore, in the present invention according to claim 3, ladder comprising a pair of left and right vertical posts having a踏桟for lifting, stepladder, a work platform, such as a workbench, either of claims 1-2 1 The telescopic mechanism according to the item is provided, and the pedestal is composed of a fixed leg serving as a base member and a telescopic leg serving as a movable member.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, in a telescopic mechanism in which a movable member is attached so as to be slidable along a guide portion formed on a base member, a pulley is disposed on each member, and a flat belt is hung between the members via the pulley. The movable member is reciprocally slidable and retractable by passing and pulling the flat belt.
[0016]
Such an expansion / contraction mechanism can be suitably used for a working scaffold such as a ladder, a stepladder, a work table, and the like including a pair of left and right pedestals provided with a step rail for raising and lowering, and the pedestal can be configured to be extendable and contractible. .
[0017]
That is, the pedestal can be composed of a fixed leg serving as a base member and an extendable leg serving as a movable member. For example, when the work scaffold is a ladder, the fixed leg serving as the base member can be used as the leg pillar of the lower ladder, and the telescopic leg serving as the movable member can be used as the leg pillar of the upper ladder.
[0018]
With such a configuration, the leg of the upper ladder can be easily expanded and contracted by moving the belt. Therefore, the length becomes short when transported, and the length can be extended to the required length when used, and the usability is good, and since it is a flat belt, it can be easily formed in a wide width and the operability is good.
[0019]
It should be noted that it is natural to provide a fastener for preventing the telescopic legs (upper ladder legs) from falling when the telescopic legs (upper ladder legs), which are movable members, are extended.
[0020]
Further, the pedestal can be expanded and contracted in two or more stages, for example, three stages.
[0021]
In this case, if the work scaffold is a ladder, it is composed of a lower ladder, a middle ladder, and an upper ladder, and the leg of the middle ladder corresponding to the first movable member is the same as the lower ladder that is the base member. A guide part is formed on the upper ladder as a second movable member along the guide part so as to be slidable back and forth, and flat across the lower, middle and upper ladders. It is possible to extend and retract the belt by reciprocatingly sliding the leg column of the upper ladder in conjunction with the reciprocal sliding of the leg column of the middle ladder.
[0022]
Further, regarding the attachment of the flat belt, the starting end and the other end thereof can be connected to the lower ladder if it is a base member, that is, a ladder.
[0023]
Further, the starting end and the other end of the flat belt can be connected to the middle ladder. In this case, a rope can be used instead of the flat belt that spans between the lower ladder and the middle ladder. Note that a flat belt is preferably used as it is between the middle ladder and the upper ladder in order to avoid an increase in the size of the ladder.
[0024]
In any case, according to the above configuration, even if the flat belt or the rope is pulled, the pulled portion is absorbed by the upward movement of the upper ladder and can maintain the tension state. And the ropes won't get loose, so it won't get in the way and people won't get caught.
[0025]
If the connecting end portion of the flat belt is provided on the lower ladder, a pulley is not necessary for this connecting portion, and therefore the number of pulleys can be reduced as compared to providing the connecting end portion on the middle ladder.
[0026]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, description will be made assuming that a working scaffold provided with an expansion / contraction mechanism is an expansion / contraction ladder (hereinafter simply referred to as “ladder”).
(First embodiment)
FIG. 1 is a schematic explanatory view showing a contracted state of a ladder having a telescopic mechanism according to the present embodiment, FIG. 2 is a schematic explanatory view showing the extended state of the ladder, and FIG. 3 is a pulley disposed on the ladder. It is explanatory drawing of.
[0027]
As shown in FIGS. 1 and 2, the ladder A according to this embodiment is composed of a lower ladder A1, a middle ladder A2, and an upper ladder A3. The middle ladder A2 is slidable back and forth with respect to the lower ladder A1. The upper ladder A3 is reciprocally attached to the middle ladder A2. In order to perform these reciprocating sliding operations, two flat belts 4 and 5 are provided.
[0028]
That is, the ladder A includes a lower ladder A1, a middle ladder A2, and an upper ladder A3 as a plurality of elastic members, and the ladder A constituting the ladder A includes a large number of lower ladders A1, middle ladder A2, and upper ladder A3. A pair of left and right pedestal columns 10, 20, 30 provided with stepping rails 11, 21, 31 for raising and lowering are provided, and on the side surfaces of the left and right pedestal columns 10 of the lower ladder A1 as a base member, A sliding surface as a guide portion is formed, and a sliding surface as an upper ladder guide portion is formed on the inner side surfaces of the left and right pedestals 20 of the middle ladder A2. Along the two sliding surfaces, a leg column 20 of the middle ladder A2 and a leg column 30 of the upper ladder A3 are attached so as to be reciprocally slidable.
[0029]
In addition, the flat belt 4 for sliding operation is spanned between the lower ladder A1 and the middle ladder A2, and the upper ladder A3 is further slid across the lower ladder A1, the middle ladder A2, and the upper ladder A3. A flat belt 5 is stretched over. Then, the expansion / contraction mechanism is configured such that the middle ladder A2 can be reciprocally slid by the operation of the flat belt 4, and the lower ladder A3 reciprocally slides in conjunction with the reciprocal sliding of the middle ladder A2.
[0030]
The flat belts 4 and 5 are stretched around a pulley attached to the ladder A, and are made of a synthetic resin which is not stretchable and sufficiently strong. Therefore, since it also has electrical insulation, it is also suitable as an insulating ladder A used for electric wire construction.
[0031]
FIG. 3 shows the pulley used in this embodiment. In the figure, reference numeral 6a denotes a pulley main body, which has only a small diameter as long as the thin flat belts 4 and 5 can be wound. Accordingly, the width D of the pulley mounting bracket 6b can be reduced. 6c is a shaft for rotatably mounting the pulley body 6a to the pulley mounting bracket 6b. Here, the pulley is a concept including a roller or the like, and any pulley may be used as long as it can guide a belt or the like that has been rotated and wound around the circumference.
[0032]
Moreover, the mounting position of the pulley in the present embodiment is as shown in FIGS.
[0033]
That is, the first pulley 61 is provided on the lower side of the one side pillar 10 of the lower ladder A1, and the second pulley 62 is provided on the upper side. In addition, a pair of upper and lower third and fourth pulleys 63 and 64 are disposed at the left and right symmetric positions on the lower side portions of the left and right pedestal columns 20 and 20 of the middle ladder A2, and the left and right leg columns 20 and 20 are also provided with the same Fifth and sixth pulleys 65 and 66 are arranged so as to be symmetrical positions. Further, belt sliding guides 67 and 67 are disposed on the lower side portions of the left and right pedestals 30 of the upper ladder A3. The belt sliding guide 67 may be anything as long as it has no corners on the contact surface with the flat belt 5 and can smoothly slide and guide the flat belt 5, and is a rotating pulley. It doesn't matter. Further, the end portion of the flat belt 5 may be directly fixed.
[0034]
The flat belt 4 for expanding and contracting the middle ladder A2 with respect to the group of pulleys arranged as described above is connected and fixed at one end to the lower side of the one side pillar 10 of the lower ladder A1 and provided on the middle ladder A2. After extending horizontally through the upper side of the lower pulley 63a of the third pulley 63 and turning downward through the upper side of the lower pulley 64a of the fourth pulley 64, the lower ladder A1 Turns upward through the lower side of the first pulley 61, extends substantially vertically along the pedestal 10, extends downward through the upper side of the second pulley 62, and extends above the fourth pulley 64. It extends horizontally through the lower part of the pulley 64b, folds upward and extends through the lower part of the upper pulley 63b of the third pulley 63, and extends to the upper part of the one side pillar 10 of the lower ladder A1. It is connected and fixed. Reference numerals 4a and 4b denote attachment end portions of the flat belt 4.
[0035]
On the other hand, the flat belt 5 for expanding and contracting the upper ladder A3 is connected and fixed at one end to the vicinity of the upper end of the one side pillar 10 of the lower ladder A1, that is, to the vicinity of the mounting end 4a of the flat belt 4. Through the upper part of the fifth pulley 65 provided at the upper part of the leg pillar 20 of A2, the direction is changed downward, and through the belt sliding guides 67, 67 provided at the lower part of the left and right leg pillars 30 of the upper ladder A3. It extends upward and changes its direction downward through the upper part of the sixth pulley 66 of the middle ladder A2 so as to be connected and fixed near the upper end of the lower ladder A1, that is, near the second pulley 62. 5a is a connecting end portion of the flat belt 5.
[0036]
With the above configuration, when the portion of the flat belt 4 located between the first pulley 61 and the second pulley 62 is pulled down, the mounting end 4a of the flat belt 4 serves as a support point as shown in FIG. The middle ladder A2 is pulled up via the third and fourth pulleys 63 and 64. At this time, the extra length portion of the flat belt 4 that has been lowered is pulled upward together with the third and fourth pulleys 63 and 64 that rise together with the middle ladder A2, and the tensioned state is maintained.
[0037]
Further, when the middle ladder A2 slides upward, the flat belt 5 connected and fixed to the leg pillars 10 and 10 of the lower ladder A1 is pulled upward and displaced as the middle ladder A2 rises. The ladder A3 slides upward and the entire ladder A extends.
[0038]
As described above, according to the present embodiment, the pulley has a small diameter, and the outer dimensions of the pulley mounting bracket 6b and the like are accordingly reduced, so that the belt arrangement space can be narrowed to make the whole compact. Since the size of the ladder A can be prevented from being increased, there is no problem in terms of weight in transportation and use.
[0039]
Further, since the width D of the flat belts 4 and 5 themselves can be secured to an extent that is easy to grip, the operability of gripping them is improved compared to a rope or the like.
[0040]
In this embodiment, the ladder A is described as a three-stage type, but it may be a two-stage type. Alternatively, a similar expansion / contraction mechanism may be applied to form a multistage system having four or more stages.
(Second embodiment)
Next, a second embodiment will be described with reference to FIGS. Note that the ladder A according to the present embodiment is a three-stage ladder, and is relatively attached with an outrigger 9 including a leg 90 that expands and contracts in the horizontal direction on the lower end side portion of the lower ladder A1. It is assumed to be large.
[0041]
FIG. 4 is a schematic explanatory view showing a contracted state of the ladder provided with the telescopic mechanism according to the second embodiment, FIG. 5 is a schematic explanatory view of the extended state of the ladder, and FIG. 6 is a front view of the ladder. FIG. 7 is an explanatory diagram viewed from the side, and FIG. 8 is an explanatory diagram of a flat belt arrangement state.
[0042]
4 to 7, in this embodiment, the flat belt 5 is used for the expansion and contraction of the upper ladder A3. However, the operation rope 6 is used for the expansion and contraction of the middle ladder A2. This is an example in which a flat belt 5 is used in combination. The start and end of the operating rope 6 are connected and fixed to the middle ladder A2.
[0043]
The attachment position of the pulley in the present embodiment is as shown in FIGS.
[0044]
That is, the first pulleys 61a and 61b are provided on the lower side portions of the left and right pedestals 10 and 10 of the lower ladder A1 so as to be symmetric with respect to the left and right lines. Pulleys 62a and 62b are provided. The first pulleys 61a and 61b and the second pulleys 62a and 62b are attached to the left and right at 90 degrees different from each other. In addition, a pair of upper and lower third and fourth pulleys 63 and 64 are disposed at the left and right symmetric positions on the lower side portions of the left and right pedestal columns 20 and 20 of the middle ladder A2, and the left and right leg columns 20 and 20 are also provided with the same Fifth and sixth pulleys 65 and 66 are arranged so as to be symmetrical positions. Further, belt sliding guides 67 and 67 are disposed on the lower side portions of the left and right pedestals 30 of the upper ladder A3. The belt sliding guide 67 may be one that rotates like a pulley, or one that directly connects the flat belt 5 as in the first embodiment.
[0045]
The actuating rope 6 for extending and retracting the middle ladder A2 with respect to the pulley group arranged as described above is connected and fixed at one end to the inner lower side portion of the one side pillar 20 of the middle ladder A2, and the lower ladder A1. Is inverted through the lower side of the first pulley 61a provided in the second pulley 63a of the middle ladder A2 and extends horizontally through the upper side of the lower pulley 63a of the third pulley 63 of the lower pulley 64a of the fourth pulley 64. After turning upward through the upper part, then turning upward through the lower part of the first pulley 61b of the lower ladder A1 and extending substantially vertically along the pedestal 10, the second pulley It extends downward through the upper part of 62b, extends horizontally through the lower part of the upper pulley 64b of the fourth pulley 64, and folds upward through the lower part of the upper pulley 63b of the third pulley 63. It extends and reverses downward through the upper side of the second pulley 62a provided on the upper side of the one side pillar 10 of the lower ladder A1, and is connected to the lower side part of the one side pillar 20 of the middle ladder A2. Fixed .
[0046]
As shown in FIG. 6, the connection start end 6 a and the connection end 6 b of the operation rope 6 are provided on the metal fitting a to which the third pulley 63 is attached. The fourth pulley 64 is attached to the metal fitting a ′.
[0047]
On the other hand, the flat belt 5 for expanding and contracting the upper ladder A3 has the same configuration as that of the first embodiment, and one end is connected and fixed to the vicinity of the upper end portion of the one side pillar 10 of the lower ladder A1, and the middle ladder A2 The direction is changed downward through the upper part of the fifth pulley 65 provided at the upper part of the pedestal 20, and upward through the belt sliding guides 67, 67 provided at the lower part of the left and right pedestal 30 of the upper ladder A3. It is extended and turned downward through the upper part of the sixth pulley 66 of the middle ladder A2 and connected and fixed near the upper end part of the lower ladder A1.
[0048]
With the above configuration, when the grip body 60 (see FIG. 6) provided in the portion of the operating rope 6 located between the first pulley 61b and the second pulley 62b is pulled downward, the operating rope 6 is wound in this embodiment. The intermediate pulley A2 is pulled up via the third and fourth pulleys 63 and 64, with the second pulley 62a to be supported as a support point (see FIG. 5). At this time, the extra length portion of the operating rope 6 that has been lowered is pulled upward together with the third and fourth pulleys 63 and 64 that rise together with the middle ladder A2, and the tension state is maintained in this case as well. become.
[0049]
Further, when the middle ladder A2 slides upward, the flat belt 5 connected and fixed to the leg pillars 10 and 10 of the lower ladder A1 is pulled upward and displaced as the middle ladder A2 rises. The ladder A3 slides upward and the entire ladder A extends.
[0050]
Thus, in this embodiment, the operating rope 6 is used to cause the middle ladder A2 to expand and contract, so even if the ladder A is relatively large, the upper ladder A3 is also included. There is no problem with durability even if weight is applied when pulling up the middle ladder A2.
[0051]
FIG. 8 shows the assembled state of the lower ladder A1, the middle ladder A2 and the upper ladder A3 and the arrangement state of the flat belt 5 in this embodiment.
[0052]
The actual assembly of the lower ladder A1, the middle ladder A2 and the upper ladder A3 in the ladder A according to the present embodiment and the first embodiment will be described. As shown in FIG. The middle ladder A2 is slidably disposed in the guide fitting 7. That is, the middle ladder A2 is slidably attached to the back surface of the lower ladder A1. The upper ladder A3 is slidably arranged in a nested manner with respect to the middle ladder A2.
[0053]
Since the starting end of the flat belt 5 on which the upper ladder A3 is slid is connected and fixed to a portion overlapping with the middle ladder A2 of the guide bracket 7, the flat belt 5 is provided on the side surface of the leg column 20 of the middle ladder A2. When connecting to the upper ladder A3 via the fifth and sixth pulleys 65 and 66, it can be smoothly operated without being twisted.
[0054]
By the way, the ladder A according to the present invention is provided with the stopper mechanism 8 common to the first and second embodiments described above, and when extended, the middle ladder A2 and the upper ladder A3 fall to the lower ladder A1 side. To prevent it.
[0055]
That is, as shown in FIGS. 6 and 9, the stopper mechanism 8 is provided on the inner side of the pedestals 20 and 30 of the middle ladder A2 and the upper ladder A3, and can be engaged with the step rails 11 and 21. A Y-shaped hook-shaped fastener 81 and a connecting member 82 rotatably attached to the fastener 81 are provided. The hook-shaped fastener 81 is connected to the connecting member 82 via a rotating shaft 83. It consists of a connected arm part 81a and an engaging part 81b formed in the shape of a bowl from the middle of the arm part 81a, and is composed of a pendulum body 81c that is rotatable inward at the tip of the arm part 81a. ing. Moreover, the stopper mechanism 8 can be provided with a stopper 84 formed in a bowl shape as required. In FIG. 9, the stopper 84 is provided in the stopper mechanism 8 disposed on the middle ladder A2.
[0056]
When extending the middle ladder A2 and the upper ladder A3, the middle ladder A2 is pulled up by a desired length, and the engaging portion 81b of the stopper mechanism 8 is above the step bar 11 to be engaged. 81c temporarily stops at a position below the step rail 21, and slowly loosens the operating rope 6 or the flat belt 4 to engage the engaging portion 81b with the step rail 11. Then, the retainer 84 is pivoted forward to be hooked on the tread bar 11. The upper ladder A3 is also extended in conjunction with the middle ladder A2, but the stopper mechanism 8 provided on the upper ladder A3 may be provided in advance at a position synchronized with the stopper mechanism 8 provided on the middle ladder A2.
[0057]
When the ladder A is contracted, after removing the retainer 84, the middle ladder A2 is lifted upward until the pendulum body 81c is located above the stepping rail 11, and the tip of the pendulum body 81c is the stepping rail 11 Lower the middle ladder A2 slowly after overlapping. As a result, the pendulum body 81c is pushed inward and pivoted inward and upward to a position where it covers the engaging portion 81b. Therefore, when lowering the middle ladder A2, the function of the stopper mechanism 8 is lost at the position of each step 11 and can be lowered downward without any trouble.
(Third embodiment)
Next, a third embodiment will be described with reference to FIG.
[0058]
This employs an extension mechanism using a flat belt 9 for the lifter B. The structure of the lifter B will be described. The lifter B is movable with a left and right masts 93a and 93b standing on a base 92 on which front and rear wheels 90 and 91 are rotatably mounted, and the masts 93a and 93b as guide portions. A loading platform 94 as a member is attached so as to be movable up and down. In addition, the load carrier 94 is connected to and supported at the lower end, and a guide pulley 95a that slides up and down in contact with the masts 93a and 93b is attached to the center of the upper part of the gate-shaped frame 95 that is attached at four locations, upper, lower, left and right. The fixed pulley 97 is rotatably attached to the upper end of the mast 93a on one side (left side in FIG. 10). Reference numerals 96a and 97a denote pulley mounting brackets.
[0059]
Further, a winding portion 98 is disposed below the fixed pulley 97 of the mast 93a on one side. One end of the flat belt 9 is connected to the drum 98a of the winding portion 98, and the flat belt 9 is The upper end of the fixed pulley 97 is extended downward and the lower end of the idler pulley 96 is extended upward, and the other end is connected and fixed to the mast 93b on the other side (right side in FIG. 10). Reference numeral 98b denotes a handle of the winding part 98.
[0060]
With such a configuration, when the handle 98b is rotated forward, the drum 98a is wound from one end of the flat belt 9, and when the handle 98b is rotated backward, the handle 98b is lifted up and down.
[0061]
Also in this embodiment, by using the thin flat belt 9, the outer dimensions of the pulley mounting brackets 96a and 97a can be reduced, and the winding around the drum 98a can be performed in an orderly manner. Further, the appearance is good, and the marketability can be enhanced as a compact lifter B.
[0062]
【The invention's effect】
The invention is carried out in the above-described form and has the following effects.
[0066]
( 1 ) A first movable member is slidably mounted along a guide portion formed on the base member, pulleys are arranged on both members, and a rope is passed between the members via the pulley. By pulling the rope, the first movable member is reciprocally slidable to expand and contract, and a guide portion is formed on the first movable member, and the second movable member is reciprocated along the guide portion. A flat belt is stretched across the base member, the first movable member, and the second movable member, and the second movable is interlocked with the reciprocating sliding of the first movable member. Since the members are configured to be reciprocally slidable, they can be used properly, such as ropes for heavy ones and belts for light ones, and miniaturization can be minimized.
[0067]
( 2 ) A working scaffold such as a ladder, a stepladder, and a workbench provided with a pair of left and right pedestals provided with a step rail for ascending and descending, including the telescopic mechanism described above, wherein the pedestal is connected to a base member Because it is composed of a fixed leg and a telescopic leg that becomes a movable member, it is possible to work at a desired height position, and it is easy to operate the pedestal up to the desired height, and it can be transported by contracting etc. Is also easier. In addition, if the flat belt and the rope are formed of an electrically insulating material, it is also suitable for use as an insulating ladder used for electric wire construction.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view showing a contracted state of a ladder provided with a telescopic mechanism according to a first embodiment.
FIG. 2 is a schematic explanatory view of the ladder extended.
FIG. 3 is an explanatory view of a pulley disposed on the ladder.
FIG. 4 is a schematic explanatory view showing a contracted state of a ladder having an extension mechanism according to a second embodiment.
FIG. 5 is a schematic explanatory view of the ladder extended.
FIG. 6 is an explanatory view of the ladder as viewed from the front.
FIG. 7 is an explanatory diagram viewed from the same side.
FIG. 8 is an explanatory diagram of a flat belt arrangement state.
FIG. 9 is an explanatory view of the stopper mechanism in a side view.
FIG. 10 is an explanatory diagram of a lifter to which the telescopic mechanism of the present invention is applied.
FIG. 11 is an explanatory diagram of a rope pulley used in a conventional telescopic mechanism.
[Explanation of symbols]
A ladder
A1 lower ladder
A2 Middle ladder
A3 Upper ladder 4 Flat belt 5 Flat belt 6 Operating rope 7 Guide bracket 8 Stopper mechanism

Claims (3)

  A first movable member is slidably mounted along a guide formed on the base member, and pulleys are arranged on both members, and a rope is passed between the members via the pulley, and the rope is pulled. By the operation, the first movable member can be reciprocated to expand and contract, and a guide portion is formed on the first movable member, and the second movable member can be reciprocated along the guide portion. The flat belt is stretched over the base member, the first movable member, and the second movable member, and the second movable member is reciprocated in conjunction with the reciprocating sliding of the first movable member. A telescopic mechanism characterized by being configured to be slidable. The beginning and end of the rope, telescopic mechanism according to claim 1, wherein a coupled to the first movable member. Ladder comprising a pair of left and right vertical posts having a踏桟for lifting, stepladder, a work platform, such as a workbench, comprising a telescopic mechanism according to any one of claims 1-2, wherein A working scaffold comprising a pedestal comprising a fixed leg as a base member and a telescopic leg as a movable member.

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