JP2634776B2 - Telescopic strut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic strut which can be stretched when used to adjust its height and contracted when not in use so as to be convenient for transportation. The present invention relates to a telescopic support column having, for example, equipment such as a floodlight and a speaker attached to an upper portion of a middle tube column.

[0002]

2. Description of the Related Art Conventionally, a telescopic strut of this kind is, for example, shown in FIG.
As shown in FIG. 11, a base pillar 100 fixed vertically to a pedestal (not shown) is provided with at least one middle pillar (in this example, two middle pipes) whose inner diameter is gradually reduced with respect to the base pillar 100. Pillars) 101 and 102 are loosely fitted sequentially so that they can slide up and down,
Pulleys 103 and 104 are attached to the upper inner peripheral surface of each of the inner pipe 100 and the inner pipe 101, and a wire rope 105 having one end fixed to the inner pipe 102
A wire rope with the other end fixed to the base column 100 and one end fixed to the middle column 101
106 is wound around a pulley 103 and the other end thereof is fixed to a winch 107. The winding or unwinding of the wire rope 106 by manually or electrically turning the winch 107 raises or lowers the middle tube columns 101, 102 to support the column. The height of any equipment attached to the upper end of the middle tube post 102, for example, a floodlight or a speaker used for road construction or the like is adjusted appropriately.

[0003]

According to such a conventional telescopic support, the wire rope 10 to be wound by the winch 107 is used.
6, the weight of the equipment installed on the upper end of the inner tube pillars 101 and 102 and the mounting brackets are all applied.For example, when a floodlight for road construction is installed, the total load exceeds 10 kg. Although the lifting operation force is reduced by the speed reduction mechanism built into the winch 107,
On the other hand, there is a disadvantage that the stretching speed of the column is reduced.
In order to make the load as small as possible,
It is conceivable to make each middle tube column 101, 102 thinner,
In that case, notches are required for pulleys 103 and 104 on the upper inner peripheral surface of the base pillar 100 and the middle pillar 101 to move up and down, which not only reduces the strength of the pillar but also increases the strength of the pillar when the pillar is extended. Since the notch is exposed, rainwater, dust, dust, and the like easily enter the inside, causing a failure or contamination, and have a problem that the appearance is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to directly raise and lower each middle tube column with a small force without using a winch. The lifting and lowering means used for this purpose is one that can be housed inside the column together with the pulley, making it possible to make the column thinner and lighter without providing a notch, and consequently expand and contract the column with only one hand. An object of the present invention is to provide a new telescopic support that can be quickly operated.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the inventor of the present application first proposed a telescopic strut shown in FIGS. This telescopic strut is loosely fitted to a base column 200, which is vertically fixed to a pedestal (not shown), so that middle tube columns 201 and 202 whose inner diameters are successively reduced with respect to the base column 200 are slidable up and down sequentially. A pulley 203 is attached to the top of the column 201, and one end is a middle column.
202 has a structure in which a wire rope 204 fixed to the lower part is wound around a pulley 203 and the other end is fixed to a lower part of the base column 200. In such a telescopic strut, one that can support the middle tube column 201 in the state of FIG. 7, in other words, the middle tube columns 201 and 202, the pulley 203, the equipment to be mounted on the upper part and its mounting bracket (both not shown), etc. The base column 200 is equipped with a lifting aid with repulsive force to support all loads including
If installed inside, the column should be able to be easily raised and lowered with one hand operation.

It is conceivable to use a gas damper as a lifting / lowering auxiliary means which has the above-mentioned repulsive force and can be housed inside the column.
If the inner tube 201 is simply moved up and down by mounting it inside, the up-and-down stroke is small (maximum stroke 350 mm of the current distribution product), and it is too short to be used as a telescopic strut. Moreover, the pulley 203 is still
In order to make the middle tubular column 201 thinner, a notch is required in the upper middle tubular column 202 for the pulley 203 to move up and down.

Therefore, a lifting assist mechanism as shown in FIGS. 8 and 9 has been proposed. In this auxiliary mechanism, a pulley 302 is provided at an upper portion of a gas damper 300 that fixes the tip of a rod 300a to a bottom mounting surface 301 and supports a cylinder cylinder 300b so as to be able to move up and down, and can accommodate the gas damper 300 and the pulley 302. A wire rope 304 having one end fixed to the lower part of the auxiliary pillar 303 is wound around the pulley 302 and the other end is fixed to the bottom mounting surface 301, as described above. The gas damper 300 assists in raising and lowering the auxiliary column 303 while accommodating the pulley 302 and the pulley 302 in the auxiliary column 303, and moves the lifting stroke (L ₂ ) of the auxiliary column 303 up and down (L). ₁ )
Can be almost doubled. Then, this lifting / lowering assist mechanism is incorporated into the telescopic strut shown in FIGS. 6 and 7, in other words, by combining the gas damper of the current distribution product and the auxiliary pipe post, the height can be practically used as a telescopic strut. Can be secured, and the above-described problem is solved by adopting a configuration described later, thereby completing the present invention.

[0008] That is, the first telescopic column according to the present invention is characterized in that a base column fixed vertically to a pedestal has at least one middle column column whose inner diameter is gradually reduced with respect to the base column. Are freely slidably fit up and down sequentially, and in the telescopic strut which expands and contracts by mutual vertical sliding of the middle tube columns, the inside of the middle tube column located at the lowermost stage rises from the lower end of the middle tube column to the uppermost stage. Along with the auxiliary column housed inside the located middle tube column, the rod end is fixed to the mounting surface provided on the bottom inside the base tube column, and the cylinder tube is raised and lowered inside the base tube column. A gas damper to be freely supported is provided so as to be housed inside the auxiliary column, and a first pulley corresponding to a lowermost middle column is provided above a cylinder cylinder of the gas damper. One end is fixed to the lower part of the auxiliary column or the lower middle column, and the other end is While the wire fixed to the lower part of the column is passed, the pulleys are sequentially provided at predetermined intervals inside the auxiliary column along the height direction, corresponding to the second and subsequent middle column, respectively. Wires are fixed to the pulley, one end of which is fixed to the lower part of the corresponding middle column and the other end is fixed to the lower part of the base column, and each intermediate column slides up and down with the expansion and contraction of the gas damper. The column is extended and contracted, and furthermore, a telescopic operation handle is provided on any middle tube column, the repulsive force of the gas damper in the contracted state, the load on the first pulley in the contracted telescopic column, and Are set to be substantially the same.

The second telescopic support of the present invention (claim 2)
In the first telescopic column, a lock mechanism for restricting the operation of the gas damper is provided, and a lock lever for controlling the on / off operation of the lock mechanism is provided at a lower portion of the base tube column. .

[0010]

According to the first aspect of the present invention, when the column is in a contracted state, the gas damper and each pulley are housed in the auxiliary column, and the auxiliary column is in the uppermost middle column. , And each of the middle tube columns is loosely fitted in the base tube column so as to be sequentially slidable up and down (see FIG. 2). At this time, the repulsive force (F ₁ ) of the gas damper and the load applied to the first pulley at the upper end of the gas damper, that is, any equipment to be attached to the respective middle, auxiliary, and uppermost middle pillars Since the load (F ₂ ) of the mounting bracket and the like is set to a state close to F ₁ = F ₂ , if the telescopic operation handle is pushed up, the load (F ₂ ) is reduced by that amount, and the balance of force is achieved. Then, the resilience (F ₁ ) of the gas damper increases and the gas damper expands. Along with this, the auxiliary pillar and the lower middle pillar rise, and the second and subsequent middle pillars also
As much as the adjacent lower middle column rises, it rises with respect to the lower middle column, and the gas damper can be practically used as a telescopic strut even if the up-and-down stroke of the gas damper is about 350 mm, which is the maximum for current distribution products. (See FIG. 3). When lowering the column in the extended state, press down on the handle for telescopic operation, and as the gas damper shrinks, the auxiliary column and the lower middle column will descend, and the second and subsequent middle tubes will move accordingly. The column also descends and returns to the contracted state described above. In addition, since the repulsive force (F ₁ ) of the gas damper and the load (F ₂ ) applied to the first pulley are balanced, it is necessary to apply a force in the middle of pushing up and pushing down the above-mentioned telescopic operation handle. If stopped, the expansion and contraction of the support can be stopped at an arbitrary position.

According to the telescopic strut according to the first aspect, the strut can be directly raised and lowered without using a winch, and the raising and lowering can be performed by using the repulsive force of the gas damper effectively and with a very small force. Can be done with
Furthermore, since the gas damper and each pulley are housed inside the column, the column can be made thinner without providing a notch to reduce the load on the first pulley, so that the column can be expanded and contracted quickly with only one hand. It is possible to do.

Further, according to the telescopic support according to claim 1,
Since the repulsive force (F ₁ ) of the gas damper and the load (F ₂ ) applied to the first pulley are balanced, a small force is applied to the column in the contracted state, the extended state, or the state extended to an arbitrary position. There is a possibility that the strut will expand and contract just by adding it. Therefore, if a lock mechanism for regulating the operation of the gas damper is provided and the lock mechanism is arbitrarily operated, the upper and lower portions of the respective middle pipe columns are locked when the operation of the gas damper is locked. Sliding is restricted, and the column is fixed in its contracted state, expanded state, and expanded state to an arbitrary position. When the lock mechanism is released, each of the middle tube columns slides up and down freely, and as described above, the columns rapidly expand and contract by operating only one hand. In addition, since the lock lever that controls the operation of the lock mechanism is provided at the lower part of the base pillar, if the handle for expansion and contraction operation is raised and lowered with one hand while pushing the lock lever with one foot, the column will expand and contract quickly, If the lock lever is no longer pressed, the column does not expand or contract, and is fixed in a contracted state, an extended state, or an extended state to an arbitrary position.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a telescopic strut according to the present invention will be described below with reference to FIGS. In this embodiment, FIG.
As shown in the figure, a first pillar 2 as a base pillar is raised and fixed to a rear portion of an upper surface of a movable trolley 1 as a pedestal, and the first pillar 2 is sequentially placed in the first pillar 2 with respect to the first pillar 2. The two middle tube columns having smaller inner diameters, that is, the second tube column 3 as the middle tube column located at the lowermost stage and the third tube column 4 as the middle tube column located at the uppermost stage can be sequentially slid up and down. The projector 6 is attached to the upper end of the third tube post 4 via a mounting bracket 5, and a generator 7 serving as a power source of the projector 6 is installed on the movable trolley 1.
The second pipe column 3 and the third pipe column 4 are connected to a gas damper 2 described later.
This figure shows a usage form in which a movable light projecting device is configured such that the column is extended and contracted by mutually sliding up and down by an operation such as 0.

A mechanism for vertically sliding the second column 3 and the third column 4 according to the present invention will be described with reference to FIGS. 2 and 3.
It will be described in detail with reference to FIG. The lower end of the first pipe column 2 is fixed to the rear portion of the upper surface of the movable trolley 1 by welding or other appropriate fixing means, and rises vertically on the movable trolley 1. Lock lever 5 described later
A partition 11 which serves as a mounting surface for the gas damper 20 is provided except for the working space 10 of 0, and the second column 3, the third column 4, and the auxiliary column 12 are provided above the partition 11. It will be stored.

The second column 3 and the third column 4 are, as described above,
The inner diameter of the first column 2 is gradually reduced, and the first column 2 is loosely fitted in the first column 2 so as to be vertically slidable. An auxiliary column 12 is integrally formed inside the second column 3. It will be installed continuously. In addition, the second column 3 projecting from the upper end of the first column 2 in the contracted state.
A handle 13 for telescopic operation is provided on the upper edge of the.

The auxiliary column 12 has a third column with the second column 3.
The lower end of the second column 3 is raised via the continuous surface 15 so as to secure a gap 14 in which the column 4 can be vertically slidably received. It will be stored.

The gas damper 20 is provided with a rod 22 which is inserted into the cylinder cylinder 21 in which gas and oil are sealed so as to be able to advance and retreat from one end of the cylinder.
The structure is well-known in this type of technical field equipped with a lock mechanism 40 shown in FIG. 1. The first pipe post is formed by inserting and fixing the tip of the rod 22 into the mounting hole 11a formed in the partition wall 11 described above. At a substantially central position inside the cylinder 2, the cylinder cylinder 21 is fixed while supporting the cylinder cylinder 21 so as to be able to move up and down with a predetermined repulsive force. The gas damper 20 is housed inside the auxiliary pipe 12.

A first pulley 30 corresponding to the second column 3 is rotatably mounted on the upper end of the cylinder 21 of the gas damper 20. The first pulley 30 has a first wire 31 having one end fixed to the lower end of the auxiliary column 12 and the other end fixed to the partition 11.
Over. On the other hand, a second pulley 32 is rotatably attached to the upper end of the auxiliary column 12 so as to correspond to the third column 4. A second wire 33, which has one end fixed to the lower end of the third column 4 and the other end fixed to the partition 11, is laid over the second pulley 32. Thereby, the second column 3 and the auxiliary column 12 are integrally moved up and down as the first pulley 30 moves up and down by the expansion and contraction of the gas damper 20, in other words, the vertical movement of the cylinder tube 21. As the second pulley 32 moves up and down integrally with this, the third pipe column 4 moves up and down, so that the support column expands and contracts. In the extended state of the support, the second
Even if the third pillar 4 rises with respect to the second pillar 3 by an amount corresponding to the rising of the pillar 3, the vertical stroke of the gas damper 20 is about 350 mm, which is the maximum as the current distribution product.
A height that can be practically used as a telescopic strut can be secured (see FIG. 3).

The repulsive force (F ₁ ) of the gas damper 20 in the contracted state is the load applied to the first pulley 30 in the contracted telescopic strut, that is, the second column 3, the third column 4, and the auxiliary column. The equipment (the floodlight 6 in this embodiment) to be attached to the upper end of the tube post 12 and the third tube post 4, and its mounting bracket 5, the handle 13, and the like, are set to be substantially the same as the total load (F ₂ ). Accordingly, when the telescopic operation handle 13 is pushed up, the load (F ₂ ) is reduced by that amount, the force balance is lost, the repulsive force (F ₁ ) of the gas damper 20 is increased, and the gas damper 20 is extended. Accompanying auxiliary column 12,
The second tube column 3 and the third tube column 4 rise as described above. On the other hand, if the handle 13 for telescopic operation is pushed down, the auxiliary column 12, the second column 3, and the third column 4 are lowered with the contraction of the gas damper 20, and the column returns to the contracted state. .

Next, a lock mechanism 40 for regulating the operation of the gas damper 20 and a lock lever 50 for controlling the operation of the lock mechanism 40 will be described with reference to FIGS. 2, 3, 4 and 5. Will be explained. In the gas damper 20, a through hole 24 is provided inside a piston 23 provided on the base end side of the rod 22, and the through hole 24 has a bottomed shape in which the end of the rod 22 is fitted and fixed to the lower end and the upper end is opened. The A chamber 21A and the B chamber 21 inside the cylinder cylinder 21 divided up and down by the piston 23 are provided at predetermined positions of the peripheral wall.
B is provided with a hole 25 for communicating with B through a through hole 24. On the other hand, the rod 22 has a cylindrical shape and
2 and a pin 26 is inserted and slidable integrally with the rod 22 so as to be slidable in the axial direction of the rod 22. The lower end of the pin 26 projects from the distal end of the rod 22 to be exposed in the space 10 described above, and the upper end projects from the proximal end of the rod 22 and passes through the through hole 24 so as to be slidably fitted into the upper end opening 24a of the through hole 24. And
Further, a valve 27 that locks to the upper edge of the opening 24a and closes the opening 24a is attached. A pin 26 is provided in the through hole 24.
A guide tube 28 for guiding the sliding of the hole is loaded, and a hole 2 is provided in the guide tube 28 so that the hole 25 communicates with the opening 24a.
9 is drilled. Oil is sealed in the A chamber 21A inside the cylinder 21 and compressed gas is sealed in the upper part and oil is sealed in the lower part in the B chamber 21B. Pressure is applied to valve 27 via oil.

The first tube post 2 is provided with a lock lever 50 for sliding the pin 26 upward. The lock lever 50 is inserted into a hole 51 formed in the vicinity of the lower end of the first tube post 2, projects its inner end side into the space 10, is swingably supported by a shaft 52, and rotates around the shaft 52. The inner end portion 50a is urged by an unillustrated urging spring provided in the direction in which the inner end portion 50a always contacts the lower end of the pin 26.

According to such a structure, the pressure of the compressed gas is normally applied to the valve 27 via the oil and the opening 24a is closed, so that the A chamber 21A in the cylinder cylinder 21 is normally closed. And the B chamber 21B are separated from each other, so that the oil does not move in the cylinder cylinder 21, so that the sliding of the piston 23, in other words, the sliding of the rod 22, is restricted, and the operation of the gas damper 20 is locked. At this time, the lower end of the pin 26 protrudes from the tip of the rod 22 and is exposed in the space 10 to push down the inner end 50a of the lock lever 50 (see FIG. 2).

In this state, when the outer end 50b of the lock lever 50 is pushed down as shown in FIG.
a pushes up the pin 26, the pin 26 slides in the rod 22, and the upper end passes through the opening 24a as shown in FIG.
The opening 24a protrudes into the chamber 21B, and accordingly, the opening 24a is opened.
A and B room 21B communicate. Therefore, the cylinder cylinder 21
When the gas damper 20 is in a contracted state, the pressure of the compressed gas acts to push down the piston 23, and the cylinder cylinder 21 rises (the gas damper 20 expands). If the gas cylinder 20 is in the extended state, the cylinder cylinder 21 descends due to the force to push down the cylinder cylinder 21 and the gas damper 20 contracts.

Thus, according to the telescopic strut of this embodiment configured as described above, it is possible to raise and lower the gas damper 20 with an extremely small force by effectively utilizing the repulsive force of the gas damper 20. Since each of the pulleys 30 and 32 is housed inside the support, the load on the first pulley 30 can be reduced by making the support narrow without providing a notch, and thus,
The extension and contraction of the support can be quickly performed with only one hand operation. In addition, since the lock mechanism 40 is provided, it is possible to arbitrarily restrict the expansion and contraction of the column and fix the column in a contracted state, an extended state, and an extended state to an arbitrary position.

That is, as shown in FIG. 2, when the column is in a contracted state, the gas damper 20 and the respective pulleys 30,
32 is housed in the auxiliary column 12, and the auxiliary column 1
Reference numeral 2 is housed in the third tube column 4, and the second and third tube columns 3 and 4 are loosely fitted in the first tube column 2 so as to be vertically slidable one after another. At this time, since the operation of the gas damper 20 is regulated by the lock mechanism 40, the column does not expand or contract unless the lock lever 50 is pressed down.

From this state, as shown in FIG. 3, when the lock lever 50 is depressed with one foot to release the lock state by the lock mechanism 40 and the telescopic operation handle 13 is pushed up with one hand, the gas damper 20 rebounds. The equilibrium between the force (F ₁ ) and the load (F ₂ ) applied to the first pulley is lost, and the repulsive force (F ₁ ) increases, causing the gas damper 20 to expand. The column 3 rises, and the third column 4 also rises relative to the second column 3 by the amount that the second column 3 rises, and extends to a height that can be practically used as a telescopic column.

If the pushing up operation of the handle 13 is stopped halfway, the extension and contraction of the support can be stopped at an arbitrary position. In other words, it is possible to adjust the height of the support columns in a stepless manner, and as in this embodiment, a floodlight for road works or the like where equipment is heavy and delicate height adjustment is required. Is extremely useful. After the height of the support is appropriately set, if the foot is removed from the lock lever 50, the lock mechanism 4
The column does not expand or contract unless the lock lever 50 is pressed down again.

When lowering the column in the extended state, the lock lever 50 is depressed with one foot and the handle 13 is depressed with one hand. As the gas damper 20 contracts, the auxiliary column 12, the second column 3, and the The three tube columns 4 also descend and return to the contracted state shown in FIG.

In the above description, since the resilience of the gas damper 20 when contracted is larger than the resilience when the gas damper 20 is extended, when the support is raised, the force applied to the handle 13 gradually increases as the support is raised. However, the force is much smaller than that of a conventional product by a winch winding operation. When the support is extended, the relationship between the repulsive force (F ₁ ) of the gas damper 20 and the load (F ₂ ) applied to the first pulley is F ₁ <F ₂ . There is a concern that the friction may be caused by the gas damper 20 itself or the frictional resistance between the pipe columns may be larger than the reaction force shortage (F ₂ ) − (F ₁ ). Needless to say, the extended state is maintained as described above, and the extended state is more reliably maintained if the lock mechanism 40 is provided as described above. Although not shown, the auxiliary column 12 requires a groove for the second wire 33 to move up and down. In this embodiment, this groove may be provided only in the auxiliary column 12. Since it is covered by the two tubular columns 3, there is no need to worry about exposure to the outside. Further, when the strut has a structure of four or more steps, the above-mentioned groove is also provided on the third pipe post 4 and thereafter is exposed to the outside, but this groove is formed in the notch for pulling up and down in the conventional product. By comparison, they have a very small width, and there is no danger of rainwater, dust or the like entering therefrom, or an accident such as being caught in a hand, and the appearance does not deteriorate.

Further, the telescopic strut according to the present invention is not limited to the three-stage structure as in the above embodiment, but at least one middle tubular pillar is loosely fitted in the base tubular pillar so as to be sequentially slidable up and down. Inside the auxiliary pillar, along the height direction, pulleys are sequentially provided at predetermined intervals corresponding to the second and subsequent middle pillars, and each pulley has a lower part of the corresponding middle pillar. If one end is fixed to one end and the other end is fixed to the lower part of the base pipe, the intermediate pillars slide up and down with each other as the gas damper expands and contracts, so that the struts expand and contract. It is also possible to apply the present invention to a telescopic strut having a stepped structure or a structure having four or more steps. Further, the usage form of the telescopic strut is not limited to the one shown in FIG. 1, but instead of the floodlight 6, a speaker or other equipment is installed, or the movable trolley 1, which shows a pedestal for fixing a base pillar, is illustrated. Instead, it is optional to make changes within a known range.

[0031]

As described above, the telescopic strut according to the present invention rises from the lower end of the lower middle column and is housed in the upper middle column and the base column. Gas damper, the gas damper is installed so as to be stored in the auxiliary column, and a first pulley corresponding to the lowermost middle column is provided above the gas damper, and the first pulley is provided in the first pulley. ,
One end is fixed to the lower part of the auxiliary column or the lower middle column, and the other end is fixed to the lower part of the base column. At the very least, pulleys are sequentially provided at predetermined height positions, and each pulley is wrapped with a wire that fixes one end to the lower part of the corresponding middle pillar and the other end to the lower part of the base pillar, and expands and contracts the gas damper. The respective intermediate pillars slide up and down with each other so that the struts expand and contract.Furthermore, a telescopic operation handle is provided on any middle tube pillar, and the repulsive force of the contracted gas damper and the contracted The new structure is designed so that the load on the first pulley of the telescopic strut is almost the same, so that the strut can be directly raised and lowered without using a winch, and the raising and lowering effectively uses the repulsive force of the gas damper. Very small to use Since the gas damper and the respective pulleys are housed inside the column, the column can be made thinner without providing a notch, and the load on the first pulley can be reduced. Can be quickly performed with only one hand operation. Further, by the combination of the auxiliary pipe column and the gas damper, it is possible to secure a height that can be used as a telescopic strut while using the gas damper (currently, a maximum elevating stroke of about 350 mm) of the current distribution product.

Therefore, the extension and contraction of the strut, which has conventionally taken time and effort with the use of a winch, can be easily performed in a fraction of the time and effort. Since the above-mentioned effect can be obtained by using a gas damper of a circulation product, the structure is simple and easy to manufacture,
The product cost could be kept low, and a telescopic strut with high commercial value could be provided. Also, since the repulsive force (F ₁ ) of the gas damper and the load (F ₂ ) applied to the first pulley are balanced, if the push-up and push-down operations of the above-mentioned telescopic operation handle are stopped halfway, Expansion and contraction can be stopped at any position. Therefore, it is extremely useful when used for equipment that is heavy and requires delicate height adjustment, such as a floodlight used for road construction or the like. Furthermore, since there is no need to provide a notch in the support, the above-mentioned effect can be obtained while maintaining the required strength of the support.Furthermore, when the notch is provided, rainwater, dust, etc. enter there, causing a failure. There is no risk that the winch or wire will be exposed to the outside, so there is no risk of accidents such as getting caught in the hands, and it is excellent in durability and safety, and it looks clean. It has many advantages such as being able to be designed.

Further, when a lock mechanism for the gas damper is provided, the expansion and contraction of the column can be arbitrarily regulated and fixed in a contracted state, an extended state, and a state extended to an arbitrary position. It is possible to prevent unexpected accidents caused by the columns extending and contracting easily, and to further improve safety. In the case of delicate height adjustment such as the above-mentioned floodlight, once the height is adjusted, the state is maintained as long as the lock is not released.
Further improvement in usability can be expected. In addition, a lock lever that controls the operation of the lock mechanism is provided at the bottom of the base pillar, so if you push up and down the handle for expansion and contraction with one hand while pushing the lock lever with one foot, the strut will expand and contract quickly, If the pressing is stopped, the column does not expand and contract and is fixed as described above, so that the above-described effect can be obtained without impairing the advantage of simple operation.

[Brief description of the drawings]

FIG. 1 is a side view showing an example in which a telescopic support according to the present invention is used for a floodlight.

FIG. 2 is a longitudinal sectional view showing one embodiment of a telescopic strut according to the present invention.

FIG. 3 is a longitudinal sectional view showing an extended state of a telescopic strut shown in FIG. 2;

FIG. 4 is an enlarged view of a main part of FIG. 2;

FIG. 5 is an enlarged view of a main part of FIG. 3;

FIG. 6 is a longitudinal sectional view showing a telescopic mechanism which is a basic of the telescopic strut according to the present invention.

FIG. 7 is a longitudinal sectional view showing an extended state of the extension mechanism shown in FIG. 6;

FIG. 8 is a vertical cross-sectional view showing a lifting and lowering assist mechanism which is a basic of the telescopic strut according to the present invention.

FIG. 9 is a longitudinal sectional side view showing an extended state of the extension mechanism shown in FIG. 8;

FIG. 10 is a longitudinal sectional view showing a conventional telescopic strut.

11 is a longitudinal sectional view showing an extended state of the telescopic strut shown in FIG.

[Explanation of symbols]

 1: Moving carriage as a pedestal 2: First pillar as a base pillar 3: Second pillar as a middle pillar located at the bottom 4: Third pillar as a middle pillar located at the top 6: Floodlight as equipment to be mounted on the upper part 11: Partition wall as mounting surface 12: Auxiliary pipe column 13: Handle for telescopic operation 20: Gas damper 21: Cylinder cylinder 22: Rod 30: First pulley 31, 33: Wire 32: pulley 40: lock mechanism 50: lock lever

Claims (2)

(57) [Claims] At least one middle tube column having a smaller inner diameter with respect to said base tube column is loosely fitted to said base column column fixed vertically to said base so as to be slidable up and down sequentially. In a telescopic support column that expands and contracts due to mutual vertical sliding, an auxiliary pipe column, which rises from the lower end of the middle column and is housed in a middle column located at the uppermost stage, is connected inside the lowermost column. A gas damper for fixing the rod tip to the mounting surface provided on the inner bottom of the base pipe column and supporting the cylinder cylinder so as to be able to move up and down is housed inside the auxiliary pipe column. A first pulley corresponding to the lower middle column is provided above the cylinder cylinder of the gas damper, and the first pulley includes
While one end is fixed to the lower part of the auxiliary column or the lower middle column, and the other end is fixed to the lower part of the base column, a wire is wound inside the auxiliary column along the height direction. Pulleys are sequentially provided at predetermined intervals corresponding to the middle pillars after the eyes,
Each pulley has a wire fixed at one end to the lower portion of the corresponding middle column and the other end fixed to the lower portion of the base column,
With the expansion and contraction of the gas damper, each of the intermediate columns slides up and down so that the column expands and contracts. Further, a handle for expansion and contraction operation is provided on any middle tube column, and the repulsive force of the gas damper in the contracted state is provided. And the load applied to the first pulley in the contracted telescopic strut is set to be substantially the same. 2. The system according to claim 1, further comprising a lock mechanism for restricting the operation of the gas damper, and a lock lever for controlling the operation of the lock mechanism being provided on a lower portion of the base tube. Telescopic strut.