JP3197834B2 - Floodlight - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floodlight mainly used as illumination for road construction at night, and more particularly, to a telescopic support (hereinafter simply referred to as a "support") mounted on a bogie. )).

[0002]

2. Description of the Related Art Conventionally, there is known a floodlight in which a telescopic support is erected on a dolly on which a generator is mounted, and a required number of lights are mounted on the upper end of the telescopic support (for example, Japanese Patent Application Laid-Open No. H07-1995). -331926).

As shown in FIG. 12, for example, as a telescopic strut constituting a floodlight of this type, a base tube 100 fixed vertically to the upper surface of a bogie (not shown) is provided with an inner diameter sequentially with respect to the base tube 100. At least one smaller, here two middle columns
101 and 102 are loosely fitted in order so as to be vertically slidable, and a first pulley 103 is attached to the upper portion of the inner surface of the base column 100, and a second pulley 104 is attached to the upper portion of the inner surface of the lower middle column 101. A first wire 105 is fixed to the lower end of the lower middle column 101 and the other end is fixed to the winding drum of the winch 107, while the second pulley 104 has one end connected to the lower portion of the upper middle column 102. It is generally known that a second wire 106 that is fixed and the other end is fixed to the upper portion of the base tube column 100 is laid. The telescoping struts are raised by the winding of the wire 105 by turning the winch 107 manually or electrically, while the middle tube posts 101 and 102 are raised and extended.
When the wire 105 is extended, the middle pillars 101 and 102 are lowered and contracted, so that the height of the light attached to the upper end of the middle pillar 102 is appropriately adjusted.

However, according to the floodlight using the above-mentioned telescopic strut, the wire 105 wound by the winch 107 takes up the entire weight of the middle tube posts 101, 102, the lights attached to the upper ends, and the mounting brackets and the like. For example, when there are two lights, the total load exceeds 10 kg. Therefore, the force required for hoisting is usually reduced by a speed reduction mechanism built in the winch 107, but on the other hand, there is a problem that the expansion and contraction speed of the column is reduced. In order to reduce the load as much as possible, each of the middle pillars 101, 102 is made thinner and pulleys 103, 10 are provided on the side walls of the respective pillars 101, 102.
Although it is conceivable to provide a slidable vertical groove for 4,
In this case, the strength of the support may be reduced, and the vertical groove is exposed when the support is extended, so that not only the appearance is poor, but also rainwater and dust, etc. easily enter the inside of the support, resulting in failure or contamination. May be caused.

On the other hand, the applicant of the present application has previously proposed a telescopic strut using a gas damper instead of the winch in order to greatly improve the telescopic operation of the telescopic strut (see Japanese Patent Application Laid-Open No. 8-184217). ). As shown in FIG. 11, this telescopic strut can slide at least one of the base tube columns 110, 112 fixed to the top surface of the bogie, the inner diameter of which is reduced in order, and in this case, the lower and upper two middle tube columns 111, 112 can be sequentially slid up and down. And a gas damper 114 is built in the base tube column 110 such that the rod 113 comes out and comes down.
The gas damper 114 connects the rod tip 115 to the
The first pulley 116 is installed above the gas damper 114 with one end fixed to the lower portion of the base column 110 and fixed to the bottom of the base column 110. While the first wire 117 is fixed to the lower part of the lower middle column 111, and the second pulley 118
One end of the second pulley 118 is connected to the upper middle column 11.
2 A second wire 119 fixed to the lower portion and the other end fixed to the lower portion of the base tube column 110 is laid.

The telescopic strut is set so that the repulsive force (elastic force) of the gas damper 114 in the contracted state and the load on the first pulley 116 in the telescopic strut in the contracted state are substantially the same. By raising and lowering the handle 120 provided on the pipe column 111, the repulsive force of the gas damper 114 can be used to instantaneously expand and contract the column without performing winding and unwinding operations of the wire. The operation can be performed with a small force that makes effective use of the repulsive force of the gas damper.

[0007]

SUMMARY OF THE INVENTION
In addition to being able to raise and lower multiple middle tube columns using the repulsive force of the gas damper, and by storing the gas damper and pulleys in the hollow interior of each tube column, each column can be made thinner without any notches. Therefore, the weight can be reduced while securing the strength as a support, and as a result, there is an advantage that the expansion and contraction of the support can be quickly performed by a simple raising and lowering operation,
Furthermore, since the lifting mechanism is not exposed from the outside, the appearance is good and there is a remarkable effect that there is little danger of rainwater or dust entering the inside of the column. Some improvements were left.

That is, as shown in FIG. 11, a conventional gas damper-type telescopic strut is mainly assumed to have a three-stage structure having two middle pipe columns, and the first pulley 116 is provided by the repulsive force of the gas damper 114.
Is raised to lift the lower middle column 111, and the second middle pulley 118 provided above the inside of the middle column 111 raises the upper middle column 112. On the other hand, when a four-stage telescopic strut is formed in order to install the light at a higher position, an auxiliary tube for installing the third pulley inside the middle tube 112 is required. A middle pillar 112 having an auxiliary pillar, a lower middle pillar 111 having an auxiliary pillar 121 for installing a second pulley 118, and an upper middle pillar (not shown) are loosely fitted in a vertically slidable manner. For this purpose, it is necessary to make the middle tube columns have a complicated structure, and in some cases, any of the above-mentioned effects may not be obtained or the production cost may increase.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional circumstances, and has as its object the purpose of the present invention in addition to the effects of the conventional gas damper-type telescopic strut by the present applicant. Another object of the present invention is to provide a new floodlight provided with a telescopic support that can extremely easily cope with a four-stage structure and can set a light at a higher position.

[0010]

According to a first aspect of the present invention, there is provided a floodlight according to the present invention. In the floodlight equipped with a required number of lights at the upper end of the column, the telescopic column is a lower, middle, and upper middle tube column whose inner diameter is sequentially reduced with respect to the base column fixed to the top of the bogie. Auxiliary pipes which are inserted into the base column in such a manner as to be slidable up and down one by one and are vertically inserted into the middle column of the middle stage so as to be slidable up and down in the middle column of the upper stage. Inside the tube pillar,
A gas damper loosely inserted and slidable up and down in the auxiliary pipe column is installed in an inverted manner so that the rod retreating side faces downward, and the rod tip of the gas damper is fixed to the inner bottom of the base column, Further, a first pulley is attached to the upper part of the gas damper, and the first pulley is connected to a first wire fixed at one end to a lower portion of the base tube column and the other end is fixed to a lower portion of the middle tube column. A second pulley is attached to the upper part of the auxiliary column, and the second pulley is provided with a second wire fixed at one end to a lower portion of the lower middle column and the other end fixed to a lower portion of the upper column. It is a gist that it is.

In this configuration, when the telescopic strut is contracted, the lower, middle, and upper three middle tubular columns and the auxiliary tubular column are loosely fitted to the inside of the base tubular column sequentially. The gas damper is housed inside the auxiliary tube, the first pulley is housed inside the auxiliary tube, and the second pulley is housed inside the upper middle tube (see FIGS. 1 and 2). In this state, if the rod is extended by the operation of the gas damper, the gas damper and the lower middle column are raised by the extension stroke of the rod, and at the same time, the first The middle column and the auxiliary column rise, and as the second pulley rises together with the auxiliary column, the upper column rises, and the four-stage telescopic strut is in an extended state. It becomes possible to install the light at a higher place than the three-tiered column (see FIGS. 3 and 4). When lowering the strut in the extended state, press down any middle tube (usually the lower middle tube) and contract the gas damper, and each middle tube descends and returns to the contracted state described above. .

Therefore, the three middle pillars can be raised by utilizing the repulsive force of the gas damper, and the gas damper and the respective pulleys are housed inside each of the pillars. Each column can be made thinner and lighter by weight, and as a result, the column can be expanded and contracted quickly with a simple raising and lowering operation, and since the lifting mechanism is not exposed from the outside, the appearance is good, and the inside of the column is good. The above-described problem of providing a floodlight provided with a four-stage telescopic strut having a low possibility of rainwater, dust, and the like entering into the vehicle can be achieved.

In the present invention, the repulsive force (elastic force) of the gas damper in the contracted state and the load applied to the gas damper in the contracted state of the telescopic strut are set so as to be substantially the same. It is preferable that the state in which the column is in the lowered position and the state in which the gas damper is contracted be balanced.

In the case of such a configuration, the contraction of the telescopic strut
At times, the resilience of the gas damper (F₁) And the moth
Load applied to the damper (F_Two) And balance
Lean, F₁= F_TwoIt is in a state close to. From this state
When the inner tubular column is pushed up, the load (F_Two) Is small
And the balance of power is lost, and the resilience of the gas damper
(F ₁) Becomes large and the gas damper is activated,
Each middle tube column rises, and the four-stage telescopic strut extends.
Be in a state. Also, depress any middle pipe column to
ー, each middle column descends,
Return to the state. Therefore, for example, the sliding of each middle tube column is suppressed.
Without any locking mechanism, etc.
The operation and effects according to claim 1 are extremely simple operations.
Can be obtained.

However, in this case, the repulsive force of the gas damper (F
₁ ) and the load (F ₂ ) are balanced, so that even a small pushing force is applied to an arbitrary middle tube column at the lowered position, the above balance is broken, and the column is inadvertently extended. May be lost. Therefore, in the present invention, it is preferable to provide a lock mechanism for restricting the operation of the gas damper, and to provide a lock lever for operating on / off of the lock mechanism so as to protrude outside the lower part of the base tube column.

In such a configuration, when the operation of the gas damper is locked, the vertical sliding of the respective middle tube columns is restricted, and the telescopic columns are fixed in a contracted state. When the lock mechanism is released, the respective middle tube columns are raised by the repulsive force of the gas damper, and the columns can be quickly expanded and contracted by only one hand operation as described above. Further, the operation of the gas damper can be locked when each of the middle pipe columns has risen to the midway height, and the extension height can be set arbitrarily.

In addition, since the lock lever for controlling the operation of the lock mechanism is provided at the lower portion of the base tube, if the handle for telescopic operation is raised and lowered with one hand while pushing the lock lever with one foot, the support can be quickly made. If it stops expanding and contracting and stops pushing the lock lever, the column does not expand and contract and is fixed in a contracted state, an extended state, or an extended state to an arbitrary position.

The above-mentioned extension and contraction operation of the column is usually carried out by raising and lowering the lower middle column. However, if the middle column is provided with a handle for raising and lowering, the above operation can be easily performed. Is preferable.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a floodlight according to the present invention will be described below with reference to FIGS. As shown in FIG. 1, the floodlight A of this embodiment has a telescopic column 3 erected on a cart 2 on which a generator 1 is mounted, and a required number of And a link mechanism (not shown) for steering the wheels is provided on the lower surface of the bogie 2. The telescopic strut 3 is configured to be detachable with respect to the trolley 2 and rotatable in the horizontal direction when mounted on the trolley 2, and the rotation of the telescopic strut 3 activates a link mechanism to steer the wheels. Is configured to be performed.

The construction relating to the detachable structure of the telescopic strut 3 and the steering of the wheels are described in the light projectors proposed by the applicant of the present invention (Japanese Patent Application Laid-Open Nos. 8-175392, 7-320502, and 8-8). This is the same as that disclosed in Japanese Patent Application Laid-Open No. 2-2586), and is not directly related to the gist of the present invention.

Hereinafter, the structure of the telescopic strut 3 which is the gist of the present invention will be described in detail with reference to FIGS. The telescopic strut 3 has three lower, middle, and upper middle tube pillars whose inner diameters are sequentially reduced with respect to the first pillar 6 as a base pillar fixed to the upper surface of the carriage 2. Four pipe columns 7,
8, 9 are loosely fitted sequentially so that they can slide up and down. An auxiliary column 10 which is inserted into the fourth column (upper column) 9 so as to be slidable up and down is mounted in the third column (middle column) 8. (Lower middle column) 7 has auxiliary column 1
The gas damper 11 which is freely inserted up and down slidably into
The rod 12 is installed in an inverted manner so that the protruding side of the rod 12 faces downward, and the rod tip 13 a is fixed to the inner bottom of the first column (base column) 6. Further, a first pulley 14 is attached to the upper part of the gas damper 11, and the first pulley 14 is provided with a first wire 15 having one end fixed to the lower part of the first column 6 and the other end fixed to the lower part of the third column 8. On the other hand, a second pulley 16 is attached to the upper portion of the auxiliary column 10, and one end of the second pulley 16 is fixed to the lower portion of the second column 7 and the other end is fixed to the lower portion of the fourth column 9. It is formed by hanging two wires 17.

The lower end of the first column 6 is fixed to the rear of the upper surface of the truck 2 by welding or other appropriate fixing means, and rises substantially vertically on the truck 2.
An operating space 19 of a lock lever 18 described later between the upper surface and the upper surface.
, A partition wall 20 is provided as a mounting surface for the rod tip portion 13a, and the second column 7, the third column 8, the fourth column 9, and the auxiliary column are provided in the space above the partition 20. 10, the gas damper 11, the first and second pulleys 14, 16 and the like are stored. The rod tip portion 13a is fixed to the partition 20 via a mounting bracket (not shown).

As described above, the inner diameter of the second column 7, the third column 8, and the fourth column 9 is gradually reduced with respect to the first column 6 so as to be sequentially slid up and down in the first column 6. It is loosely fitted,
A bottom wall 21 is provided at the bottom of the second tubular column 7 and the bottom wall 2 is provided.
1, a support member 22 is provided, and the support member 22 holds the end of the main body (cylinder cylinder) 23 of the gas damper 11 on the rod projecting / retracting side. It is installed upside down in the second column 7 in a state of being housed in the second column 7. In addition, a handle 24 for expansion and contraction operation is provided on the upper edge of the second column 7 slightly projecting from the upper end of the first column 6 in the contracted state of the column 3.

The auxiliary column 10 is positioned between the third column 8 and the third column 8 such that a gap 25 in which the fourth column 9 and the second pulley 16 are vertically slidable is secured. 8 and rises from the lower end edge via the connecting surface 26 and is freely inserted into the fourth tubular column 9 so as to be vertically slidable.

In the gas damper 11, the rod 12 is inserted so as to be able to advance and retreat from one end seal portion of a main body 23 in which gas and oil are sealed, and a lock mechanism 40 shown in FIGS. It has a well-known structure in this type of technical field, and as described above, the rod tip 13a is fixed to the inner bottom of the first column 6 and rises upside down, and the main body 23 is in the second position. It is fixed in a tubular column 7 in a housed state.

A first pulley 14 is rotatably supported at the upper end of the main body 23 of the gas damper 11 via a support fitting 27, and a first wire 15 is laid over the first pulley 14.

The first wire 15 is hooked at one end to a retaining ring 28a protruding from the inner bottom of the auxiliary pipe post 10, and the second pipe post 7
The other end is hooked on a stopper fitting 28 b protruding from the inner bottom of the first pipe column 6, and is wound around the first pulley 15.

On the upper outer surface of the auxiliary column 10, a U-shaped frame 29 in a plan view is provided so as to protrude into the gap 25, and the second pulley 16 is rotatable between the frame 29 and the auxiliary column 10. And a second wire 17 is passed over the second pulley 16.

The second wire 17 is hooked at one end to a retaining ring 30 projecting from the inner bottom of the fourth tubular column 9, and is connected to the connecting surface 26.
Through the through hole 31 provided at the other end, and hooked on the other end side to the bottom wall 21 of the second tubular column 7, and is bridged over the second pulley 16.

Thus, as the rod 12 expands and contracts by the operation of the gas damper 11, the main body 23 moves up and down, and the second pipe column 7 moves up and down integrally therewith. At the same time, as the first pulley 14 moves up and down integrally with the gas damper body 23, the third tube 8 and the auxiliary tube 10 move up and down integrally. Further, as the second pulley 16 moves up and down integrally with the auxiliary tube 10, the fourth tube 9 moves up and down, and the telescopic strut 3 having the four-stage structure is expanded and contracted.

In this embodiment, the repulsive force (elasticity; F ₁ ) of the gas damper 11 in the contracted state and the load applied to the gas damper 11 in the contracted telescopic column 3, ie, the second to fourth, The lights 5 to be attached to the upper end of each of the tube columns 7, 8, 9 and the auxiliary tube 10 and the fourth column 9 are set to be substantially the same as the total load (F ₂ ) of the mounting bracket 4, the handle 24 and the like. Thus, the configuration is such that the state where each of the middle pipe columns is at the lowered position and the contracted state of the gas damper are balanced.

As a result, when the handle 24 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 11 is increased, and the gas damper 11 is extended. As a result, the respective columns 7 to 9 rise instantaneously as described above, and the columns 3 are quickly extended. On the other hand, if the handle 24 is pushed down, the gas damper 1
As 1 contracts, each pipe column 7-9 descends instantaneously,
The struts 3 contract quickly.

Next, the lock mechanism 40 for controlling the operation of the gas damper 11 and the lock lever 18 for controlling the operation of the lock mechanism 40 will be described with reference to FIGS. I do. 9 and 10 show the inside of the main body 23 of the gas damper 11. In the main body 23, a through hole 42 is provided inside a piston 41 provided on the base end side of the rod 12, and the through hole 42 is provided. Has a bottomed shape in which the rod base end 13b is fitted and fixed to the lower end and the upper end is opened,
In addition, at a predetermined position of the peripheral wall, an A chamber 43a and a B chamber 43b inside the main body 23 partitioned vertically by the piston 41 are provided.
A hole 44 is provided for communication through the through hole 42.

On the other hand, the rod 12 has a cylindrical shape, and a pin 45 is inserted into the rod 12 so as to slide integrally with the rod 12 and to slide in the axial direction of the rod 12. The lower end of the pin 45 protrudes from the rod distal end 13a and protrudes into the above-described working space 19, and the upper end protrudes from the rod proximal end 13b, passes through the through hole 42, and slides into the upper end opening 42a of the through hole 42. , And a valve 46 for locking and closing the upper edge of the opening 42a is attached. A guide tube 47 for guiding the sliding of the pin 45 is loaded in the through hole 42, and a hole 48 is formed in the guide tube 47 so that the hole 44 communicates with the opening 42a.

In the A chamber 43a in the main body 23, oil is sealed, and in the B chamber 43b, compressed gas is sealed in the upper part and oil is sealed in the lower part. In (2), the pressure of the compressed gas is applied to the valve 46 via oil.

The first tube post 6 is provided with a lock lever 18 for sliding the pin 45 upward. The lock lever 18 is inserted into a hole 51 formed in the vicinity of the lower end of the first pipe column 6, projects its inner end side into the working space 19, is swingably supported by a shaft 52, and
The inner end 18a is formed by a biasing spring (not shown)
Is always urged to abut the lower end of the pin 45.

According to such a configuration, the pressure of the compressed gas is normally applied to the valve 46 via the oil and the opening 42a is closed by this, so that the main body 2
A room 43a and B room 43b in 3 are divided,
The oil does not move inside, so the sliding of the piston 41, in other words, the sliding of the rod 12, is restricted, and the operation of the gas damper 11 is locked. At this time, the lower end of the pin 45 projects from the tip of the rod 12 and
The inner end 18a of the lock lever 18 is pushed down (see FIG. 2).

In this state, when the outer end 18b of the lock lever 18 is pushed down as shown in FIG.
8a pushes up the pin 45, and the pin 45 slides in the rod 12 and its upper end passes through the opening 42a and protrudes into the B chamber 43b, as shown in FIG. A through the through hole 42, the hole 48, and the opening 42a.
The chamber 43a communicates with the B chamber 43b. Therefore, the main body 2
3 moves freely within the gas damper 11 and the gas damper 11 moves.
Is in a contracted state, the piston 41 is actuated by the pressure of the compressed gas.
The rod 12 is extended by the force of pushing down the
Rises), and if the rod 12 is in the extended state, the main body 23 is lowered by the force to push down the main body 23, and the rod 12 contracts.

Thus, according to the embodiment having the above-described configuration, the resilient force of the gas damper 11 allows the telescopic strut 3 to be expanded and contracted (elevated), and the gas damper 11 serving as an elevating mechanism and the respective pulleys 14 are provided. , 16 are accommodated in each of the columns 6 to 10, so that each of the columns 6 to 10 is not provided with a notch.
10 can be made thinner to reduce its weight, so that
Can be quickly expanded and lowered by a simple raising and lowering operation, and since the lifting mechanism is not exposed from the outside, the appearance is good, and there is little danger that rainwater, dust and the like may enter the inside of the column. Moreover, since the lock mechanism 40 is provided, the four-stage telescopic strut 3 can fix the strut 3 in a contracted state, an extended state, and a state where the strut 3 is extended to an arbitrary position by arbitrarily restricting the expansion and contraction of the strut 3. A new floodlight A was provided.

That is, as shown in FIG. 1 and FIG.
Is in the contracted state, the gas damper 11 and the first pulley 1
4 is accommodated in the auxiliary column 10, the second pulley 16 is accommodated in the gap 25 between the auxiliary column 10 and the fourth column 9, and the auxiliary column 1
0, the fourth column 9, the third column 8, and the second column 7 are the first column 6
Are in a state of being loosely fitted one after another. At this time, since the operation of the gas damper 11 is regulated by the lock mechanism 40, the column 3 does not expand or contract unless the lock lever 18 is pressed down.

In this state, when the lock lever 18 is depressed with one foot to release the locked state by the lock mechanism 40 and the handle 24 is pushed up with one hand, the gas damper 11
Repulsive force (F ₁ ) and the load (F
₂ ), the repulsive force (F ₁ ) becomes larger, and the gas damper 11 is extended, whereby the second column 7, the third column 8, the auxiliary column 10, the fourth column The column 9 rises, and the telescopic column 3 having the height of the four-stage structure is extended (see FIGS. 3 and 4).

If the operation of pushing up the handle 24 is stopped halfway, the expansion and contraction of the support 3 can be stopped at an arbitrary position. In other words, it is possible to adjust the height of the column 3 in a stepless manner, and this is extremely useful in a road construction light that is heavy and requires delicate height adjustment as in this example. . After the height of the column 3 is arbitrarily set, if the foot is removed from the lock lever 18, the lock 3 returns to the locked state by the lock mechanism 40, and the column 3 does not expand and contract unless the lock lever 18 is pushed down again. The height position is locked.

When lowering the column 3 in the extended state, the lock lever 18 is depressed with one foot and the handle 24 is depressed with one hand. The fourth tube 9 and the auxiliary tube 10 are also lowered, and return to the contracted state shown in FIGS.

In the above description, since the repulsive force of the gas damper 11 when contracted is larger than that when the gas damper 11 is extended, when the support 3 is raised, the force applied to the handle 24 gradually increases as the support 3 is raised. Although it becomes large, the force is much smaller than the conventional product by the winch winding operation.

When the column 3 is extended, the gas damper 1
The relationship between the repulsive force (F ₁ ) of _{No. 1} and the load (F ₂ ) applied to the gas damper 11 is F ₁ <F ₂ , and there is a concern that the support 3 may fall when the hand is released from the handle 24. However, in reality, the friction of the gas damper 11 itself and the frictional resistance between the pipe columns are due to the shortage of the reaction force (F ₂ ) − (F
₁ ) Since it is larger, the extended state is maintained as described above, and if the lock mechanism 40 is provided as described above, it is needless to say that the extended state is more reliably maintained.
Also, as mentioned above, in actual use, the first, second,
A predetermined frictional resistance (sliding resistance) is generated between the third and fourth tube columns 6, 7, 8, and 9, and the resistance is caused by the sliding of the second to fourth tube columns 7, 8, and 9. Become a guide. In other words, the second to fourth pipe columns 7, 8, 9 are mutually supported by the resistance, so that the load on the rod 12 of the gas damper 11 is reduced, and the rod 12 in the operation of the gas damper 11 is reduced.
Even if the rod 12 is made thin to some extent in order to reduce the sliding resistance, there is no fear that the rod 12 is damaged. Therefore, the effect that the operation of raising and lowering the column 3 can be performed quickly can be more reliably achieved.

[0046]

Since the present invention is configured as described above, the following effects can be obtained. According to the configuration of the first aspect, the three middle tube columns can be raised and lowered by utilizing the repulsive force of the gas damper, and the lifting mechanism including the gas damper is housed inside the column, so that the notch is notched. It is possible to reduce the load on the gas damper by making the column thinner without providing the support. Therefore, the expansion and contraction of the strut, which conventionally took time and effort by using a winch, can be easily performed with a fraction of the time and effort, and the appearance is good because the lifting mechanism is not exposed from the outside. In addition, a four-stage telescopic strut allows the light to be set higher than before, making it a floodlight with a high commercial value that can be used in the field where a wider range of light is required. did it.

Further, since it is not necessary to provide a notch in the support, the above-described effect can be obtained while maintaining the required strength of the support. In addition, when the notch is provided, rainwater, dust, etc. enter from the cutout. There is no danger of causing failure or soiling, and there is no danger of pinching your hands because the winch or wire is not exposed to the outside. It offers many advantages, such as a cleaner design.

According to the second aspect of the present invention, the operation of the gas damper is arbitrarily controlled by the stepping operation of the lock mechanism, thereby stopping the expansion and contraction of the support at an arbitrary position and finely adjusting the height position of the light. can do. Therefore, it is extremely useful when used for road construction at night. In addition, it is possible to prevent an unexpected accident due to the careless expansion and contraction of the support, and to further improve the safety. In the case of a light that requires delicate height adjustment, such as the light described above, once the height is adjusted, it remains the same as long as the lock is not released, further improving usability. It has many advantages such as expectation.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of an embodiment of a floodlight according to the present invention.

FIG. 2 is a longitudinal sectional view of a telescopic strut in a contracted state.

FIG. 3 is a longitudinal sectional view of a telescopic strut in an extended state.

FIG. 4 is a sectional view taken along the line (4)-(4) in FIG. 3;

FIG. 5 is an enlarged sectional view taken along line (5)-(5) in FIG. 3;

FIG. 6 is an enlarged sectional view taken along line (6)-(6) in FIG. 3;

FIG. 7 is an enlarged sectional view taken along the line (7)-(7) of FIG. 3;

FIG. 8 is an enlarged sectional view taken along line (8)-(8) in FIG. 3;

FIG. 9 is an enlarged sectional view showing a locked state of the gas damper.

FIG. 10 is an enlarged sectional view showing an unlocked state of the gas damper.

FIG. 11 is a longitudinal sectional view showing an example of a conventional gas damper-type telescopic strut.

FIG. 12 is a longitudinal sectional view showing an example of a conventional winch-type telescopic strut.

[Explanation of symbols]

 A: Floodlight 1: Generator 2: Bogie 3: Telescopic strut 5: Light 6: First column (base column) 7: Second column (lower middle column) 8: Third column ( 9: Fourth pillar (upper middle pillar) 10: Auxiliary pillar 11: Gas damper 12: Rod 14: First pulley 15: First wire 16: Second pulley 17: Second Wire 18: Lock lever 40: Lock mechanism

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-8-184217 (JP, A) JP-A-3-53702 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F21V 21/22 E04H 12/18

Claims (2)

(57) [Claims] 1. A floodlight in which a telescopic strut is erected on a dolly on which a generator is mounted, and a required number of lights are mounted on an upper end of the telescopic strut. The lower, middle, and upper middle pillars, whose inner diameters are sequentially reduced, are loosely fitted into the middle pillar in order to be able to slide up and down. Auxiliary column that is movably inserted is attached, and in the lower middle column, a gas damper that is slidably inserted vertically into the auxiliary column is installed in an inverted manner so that the rod projecting side faces downward. At the same time, the rod tip of the gas damper is fixed to the inner bottom of the base column, and a first pulley is mounted on the upper portion of the gas damper. One end of the first pulley is fixed to the lower portion of the base column. While hanging the first wire fixing the other end to the lower part of the middle tube column, A second pulley is attached to the upper part of the auxiliary column, and the second pulley is provided with a second wire fixed at one end to a lower portion of the lower middle column and the other end fixed to a lower portion of the upper column. Floodlight. 2. The method according to claim 1, wherein the repulsive force of the gas damper in the contracted state and the load applied to the gas damper in the contracted state of the telescopic strut are set to be substantially the same. A lock mechanism that balances the contracted state of the damper and regulates the operation of the gas damper is provided, and a lock lever that operates and locks the lock mechanism is provided protruding outside the lower portion of the base tube column. Item 1
The floodlight as described.