JPH0917226A - Projector - Google Patents

Abstract

PURPOSE: To improve safety by providing a mast locking device with a mast locking part to fix the uppermost mast to the uppermost position and an unlocking part to unlock the uppermost mast when stored and hold it when unexpectedly moved down. CONSTITUTION: When the uppermost mast 14 provided with an illuminating lamp is moved up to the uppermost position, a mast locking part 100a is operated to lock a projector. When the mast 14 is stored, the locking part 100a is automatically unlocked by the operation of an unlocking part 100b. In this way, all masts 11-14 can be automatically stored by the reverse run of a winch 34 and a pulley 33. When the mast 14 is locked at the uppermost position, if a rope 31 is cut off, the unlocking part 100b is not operated and so that mast 14 is held in the locked condition not to be moved down to the lowermost position. Danger to a human body due to the illuminating lamp can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floodlight used for nighttime illumination of a civil engineering work site or the like.

[0002]

2. Description of the Related Art New construction and repair works for roads are often carried out at night due to traffic restrictions, etc. Also, because of the nature of the work, it is necessary to have movable night lighting. A floodlight equipped with is used.

In this type of conventional floodlight, a lifting device consisting of a plurality of stages of lifting rods is fixedly mounted on a chassis having front and rear wheels, and an illumination lamp is attached to the upper end of the uppermost stage. By unwinding the wire rope with a winch, the illuminating lamp is moved up and down through the lifting rod.

By the way, in such a conventional floodlight, if the wire rope is broken in the state where the raising and lowering rod is raised and the illumination lamp is raised, the raising and lowering rod is lowered by its own weight. , The illumination lamp descends as the elevator rod descends.

[0005] Since the illuminating lamp is quite heavy, it is very dangerous if it falls down and comes into contact with the worker's body.

Therefore, the applicant of the present application filed Japanese Patent Application No. 6-276.
Even if the wire rope is cut off by the 211 when the illuminating lamp is raised, the uppermost elevating rod to which the illuminating lamp is attached does not descend to the lowermost position, and the human body is protected by the illuminating lamp. We propose a floodlight that can avoid danger.

As shown in FIGS. 4 and 5, the floodlight 1 is provided with a pair of left and right front wheels 2 and a rear wheel 3 and is movable, and a generator 4 fixedly mounted on the chassis 4. It is composed of a machine 5 and a lighting device 6.

The illuminating device 6 comprises an elevating device 7 and an illuminating lamp 8 provided above the elevating device 7. The illuminating lamp 8 is connected by a cable (not shown) through a lamp ballast 9 to a generator 5. And is lit by using this generator 5 as a power source.

The chassis 4 is provided with a handle 10 for changing the direction of the front and rear wheels 2, 3 and a brake device (not shown).

The elevating device 7 is provided with a first
The mast 11, and the second mast 12, the third mast 13, and the fourth mast 1 which are retractably accommodated in the first mast 11.
4, the second mast 12 is installed in the first mast 11, the third mast 13 is installed in the second mast 12, and the fourth mast 14 is installed in the third mast 13. It is installed inside, the first mast 11,
The second mast 12 and the third mast 13 are internally and extensible so as to project from the upper ends thereof.

The first mast 11, the second mast 12, and the third mast 12
At the upper end of each of the masts 13, the second mast 12, the third mast
Guide members 15, 16, 17 for guiding the mast 13 and the fourth mast 14, respectively, are provided. An illumination lamp mounting portion 18 is provided on the top of the fourth mast 14, and the illumination lamp mounting portion 18 has an illumination lamp. 8 is attached.

The first mast 11, the second mast 12, and the third mast
At the upper end of each of the masts 13, stopper members 19, 20, and 21 are provided to regulate the respective highest positions of the second mast 12, the third mast 13, and the fourth mast 14, while the second mast 12, The first mast 1 is provided at the lower end of each of the third mast 13 and the fourth mast 14.
1, engaging members 22, 2 which engage with stopper members 19, 20, 21 of the second mast 12 and the third mast 13, respectively.
3 and 24 are provided.

The second mast 12 and the third mast 13 include
As shown in FIG. 7, the pulleys 25 and 26 and the pulley 2 respectively.
7, 28 are provided. The pulley 25 and the pulley 27 are attached to the upper inner walls of the second mast 12 and the third mast 13, respectively, and the pulleys 26 and 28 are the second mast 12 respectively.
And mounting holes 29, 3 formed in the lower wall surface of the third mast 13.
It is attached to part 0 across the rod wall of each mast 12, 13.

One end of the wire rope 31 is the fourth mast 1
4 is guided to the pulley 27, the pulley 28, the pulley 25, and the pulley 26 in this order, and then the first mast 1 is inserted into the mounting hole 32 formed in the upper wall surface of the first mast 11.
A pulley 33 mounted across the rod wall 1 guides the first mast 11 to the outside, and the other end is locked to a winch 34 mounted on the outer wall of the first mast 11.

At a position below the guide member 17 of the third mast 13, a mast lock device 35 for fixing the fourth mast 14 at the highest position is provided as shown in FIG.

As shown in FIG. 8, the mast lock device 35 has a pin through hole 36 formed in the rod wall at the upper end of the third mast 13 and a rod wall at the lower end of the fourth mast 14. When the fourth mast 14 is at the highest position, the pin through hole 3
6 and a pin through hole 37 that is in a penetrating state, and a pin 38 that is expandable and contractable in these pin through holes 36 and 37.

The pin 38 is constantly urged by a biasing member 40, such as a coil spring, installed inside a case 39 attached to the outer wall surface of the third mast 13 so that the pin 38 can pass through the pin through hole 3 at all times.
6, 37 are urged in the insertion direction. A connecting rod 41 extends from the pin 38, and the connecting rod 41 projects outside through a through hole 42 of the case 39. A knob 43 is attached to the projecting end by screwing or the like.

According to the projector 1 having the above-described structure, when raising the illumination lamp 8, the handle 44 of the winch 34 is turned to wind the wire rope 31.

The tip of the wire rope 31 has a fourth mast 14
When the wire rope 31 is wound up, first, the fourth mast 14 moves upward. Then, when the fourth mast 14 is raised to the highest position, that is, the engaging member 24 of the fourth mast 14
8, the pin 38 of the mast lock device 35 passes through the pin through hole 36 of the third mast 13 and the pin through hole 37 of the fourth mast 14, as shown in FIG. And the lower end of the fourth mast 14 is locked to the upper end of the third mast 13.

Further, when the wire rope 31 is wound by turning the handle 44 of the winch 34, the third mast 13 is moved upward, and when it reaches the maximum raised position, the second mast 12 is subsequently raised. Moving.

In this way, the upper fourth mast 14 first rises, and then the lower third mast 13 and the second mast 12 gradually rise, so that the respective masts 14, 13 and 12 are at their highest positions. The lamp 8 reaches the maximum height in the state where the lamp 8 is raised.

The height of the illuminating lamp 8 is the same as that of the wire rope 3.
The height can be adjusted to an arbitrary height by adjusting the winding amount.

Next, when the rising illumination lamp 8 is lowered, the handle 44 of the winch 34 is reversely rotated and the wire rope 31 is fed out.

When the wire rope 31 is paid out, first, the second mast 12 is moved downward by gravity. And the second
When the mast 12 descends to the lowermost position and the wire rope 31 is further extended, the third mast 13 starts to move downward by gravity and descends to the lowermost position.

When the third mast 13 descends to the lowest position, the fourth mast 14 is then descended.
Since the fourth mast 14 is locked to the third mast 13 by the mast lock device 35, the knob 43 is
After pulling the pin 38 out of the pin through hole 37 through the connecting rod 41 to release the lock, the handle 44 of the winch 34 is rotated in the reverse direction and the wire rope 31 is fed out. Then, the fourth mast 14 begins to move downward due to gravity and descends to the lowest position. In this way, the masts 14, 13, 12 are stored. In this floodlight 1, the lower end portion of the uppermost fourth mast 14 is locked to the upper end portion of the third mast 13 in the next stage by the mast lock device 35, and therefore the illumination lamp 8 is raised. Then, even if the wire rope 31 is cut off,
The second mast 12 and the third mast 13 descend to the lowest position, but the fourth mast 14 does not descend to the lowest position. Therefore, it is possible to avoid danger to the human body and the like caused by the illumination lamp 8 attached to the uppermost mast caused by the lowering of the mast.

[0026]

However, in the above projector, when the rising lamp 8 is lowered, the handle 44 of the winch 34 is rotated in the reverse direction so that the wire rope 31 is fed out. The third mast 13 descends to the lowest position, and then the fourth mast 1
When lowering 4, the fourth mast 14 is locked to the third mast 13 by the mast lock device 35, so the knob 43 is pulled outward against the biasing force of the biasing member 40 and the connecting rod 41 is inserted. After the pin 38 is pulled out from the through hole 37 and the lock is released, the handle 44 of the winch 34 must be reversely rotated to pay out the wire rope 31, so that the storing operation of the fourth mast 14 is complicated. .

Therefore, an object of the present invention is to provide a floodlight which can secure the safety against an unexpected descent of the illumination lamp and can simplify the descent operation of the illumination lamp.

[0028]

In order to solve the above-mentioned problems, the floodlight of claim 1 is provided with a movable chassis, a generator fixedly mounted on the chassis, and an illuminating lamp at the upper end. The above-mentioned lifting device comprises a plurality of masts which are gradually thinned from bottom to top and are fitted into each other, and a winch is provided at an appropriate middle position of the lowermost mast and an upper end. Pulleys are installed in the upper part and lower ends of the masts that are sequentially inserted into the masts, and one end is locked to the lower end of the uppermost mast. In a projector in which the pulleys at the upper end of the masts that are fitted and inserted into each other are sequentially wound to the pulleys at the lower end and the other end is locked to the winch through the pulleys at the upper end of the mast at the bottom, The top mast is the mast that fixes the mast at the top position. And a lock release unit for releasing the locked state of the mast lock section when the uppermost mast is stored and for holding the mastlock section in the locked state when the uppermost mast descends due to an unexpected situation. It is characterized in that a mast lock device consisting of and is provided.

According to a second aspect of the present invention, in the light projector according to the first aspect, the mast lock portion is fitted with a pin through hole formed in a lower end portion of the uppermost mast and the uppermost mast. The pin that is provided at the upper end of the mast of the next stage to be inserted and that can be inserted into and removed from the pin through hole, the biasing member that elastically biases the pin in the direction of inserting the pin into the pin through hole, and the pin that penetrates the pin. It is characterized by comprising a lock release lever which is moved in a direction of separating from the hole.

A floodlight according to a third aspect is the floodlight according to the first or second aspect, in which the lock release portion is provided on the lowermost mast and is disposed on the uppermost portion of the lowermost mast. A tension arm having a tension pulley that receives the tension of the wire rope between the winch and the winch, and a lock release member that is interlockingly connected to the tension arm and is movable to an engagement / disengagement position on the lock release lever of the mast lock part, When the tension pulley receives the tension of the wire rope, the lock release member is located at the engagement position with the lock release lever when the tension pulley receives the tension of the wire rope. When the pulley loses the tension from the wire rope, the lock release member moves from the engagement position with the lock release lever to the release position. And it features.

[0031]

According to the projector of claim 1, when the mast at the uppermost stage to which the illuminating lamp is attached rises to the highest position, the mast is locked by the action of the mast lock portion.

When the uppermost mast is stored, the lock of the mast lock portion is automatically released by the action of the lock release portion. Therefore, all the masts can be automatically stored. Also, when the topmost mast is locked at the highest position, and if the wire rope should break, the topmost mast is locked by the mast lock because the unlocking part does not work. It is kept as it is and never descends to the lowest position. Therefore, it is possible to avoid the danger to the human body and the like due to the illumination lamp attached to the uppermost stage.

A floodlight according to a second aspect is the floodlight according to the first aspect, in which when the uppermost mast is raised to the maximum raised position,
Since the pin is automatically inserted into the pin through hole, the mast can be automatically locked.

According to a third aspect of the present invention, in the light projector according to the first or second aspect, the lock release member engages with the lock release lever of the mast lock portion when the tension pulley receives the tension of the wire rope. Therefore, when the uppermost mast locked in the mast lock portion is stored, the lock release member of the mast lock portion engages with the lock release member to lock the mast lock portion. Automatically release. Therefore, all the masts can be automatically stored.

Further, when the tension pulley loses the tension from the wire rope, the lock release member moves from the engagement position with the lock release lever of the mast lock portion to the release position, so that the uppermost mast is at the highest position. If the wire rope is broken when locked with the lock release member, the lock release member does not engage with the lock release lever of the mast lock section, so the top mast is locked by the mast lock section. It is held at and never descends to the lowest position.

Therefore, it is possible to avoid the danger to the human body and the like due to the illumination lamp attached to the uppermost stage.

[0037]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a mast lock device for a floodlight according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a sectional view showing a mast lock portion of the lock device.

The same members as those in the embodiment of the above-mentioned Japanese Patent Application No. 6-276211 are designated by the same reference numerals, and the duplicated description will be omitted.

The floodlight 1 of this embodiment is the same as the Japanese Patent Application No. 6-
Like the embodiment of 276211, it is composed of a movable chassis 4 and a generator 5 and a lighting device 6 fixedly mounted on the chassis 4. The lighting device 6 includes a lifting device 7 and this lifting device 7.
And an illumination lamp 8 provided above.

The elevating device 7 is a first device that is placed on the chassis 4 in a stacked manner.
The mast 11, and the second mast 12, the third mast 13, and the fourth mast 1 which are retractably accommodated in the first mast 11.
4, the second mast 12 is provided in the first mast 11, the third mast 13 is provided in the second mast 12, and the fourth mast 14 is provided in the third mast 13. , The first mast 11 and the second mast 1 respectively
2. The third mast 13 is provided so as to extend and contract from the upper end thereof.

In the second mast 12 and the third mast 13,
Pulleys 25 and 26 and pulleys 27 and 28 are provided, respectively. The pulley 25 and the pulley 27 are respectively the second mast 12
And the pulleys 28 and 28 are attached to the upper inner walls of the mast 1 and the third mast 13, and the masts 1 and 2 are attached to the attachment holes 29 and 30 formed in the lower wall surfaces of the second mast 12 and the third mast 13, respectively.
It is mounted across the 2 and 13 rod walls.

One end of the wire rope 31 is the fourth mast 1
4 is guided to the pulley 27, the pulley 28, the pulley 25, and the pulley 26 in this order, and then the first mast 1 is inserted into the mounting hole 32 formed in the upper wall surface of the first mast 11.
A pulley 33 mounted across the rod wall 1 guides the first mast 11 to the outside, and the other end is locked to a winch 34 mounted on the outer wall of the first mast 11.

The projector 1 of this embodiment is provided with a mast lock device 100 as shown in FIGS. The mast lock device 100 releases the locked state of the mast lock portion 100a that fixes the fourth mast 14 at the highest position and the mast lock portion 100a when the fourth mast 14 is stored, and the fourth mast 14 is released due to an unexpected situation. The lock release unit 100b holds the mast lock unit 100a in the locked state when is lowered.

As shown in FIG. 3, the mast lock portion 100a is formed in the rod wall at the upper end of the third mast 13 and in the rod wall at the lower end of the fourth mast 14. When the fourth mast 14 is at the highest position, the pin through hole 3
6 and a pin through hole 37 that is in a penetrating state, and a pin 38 that is expandable and contractable in these pin through holes 36 and 37.

The pin 38 is constantly urged by the urging member 40 formed of a coil spring or the like inside a case 39 attached to the outer wall surface of the third mast 13 so that the pin through-hole 3 can be maintained.
6, 37 are urged in the insertion direction. A connecting rod 41 is extended to the pin 38, and the connecting rod 41 is projected to the outside from a through hole 42 of the case 39, and a lock release lever 51 and a knob 43 are attached to the protruding end portion. .

The lock release lever 51 has a bent portion whose lower end portion is bent outward, and the inner surface of the bent portion engages with the lock releasing member 52 of the lock releasing portion 100b, which will be described later.
b is formed.

On the other hand, the lock releasing portion 100b is shown in FIGS.
As shown in FIG. 3, the support member 53 is attached to the wall surface of the first mast 11 together with the winch 34.
The bearing shaft 54 integrally provided on the upper end of the support shaft 55
Are rotatably supported. A tension arm 56 is integrally fixed to the support shaft 55, and a tension pulley 57 is rotatably provided at its tip end via a shaft 58. The tension pulley 57 is arranged between the pulley 33 and the winch 34 so as to receive the tension of the wire rope 31.

One end of the support shaft 55 is attached to the first mast 11
Of the lock release member 52 is integrally fixed to the protruding end portion. An engagement portion 59 that can be engaged with and disengaged from the engagement surface 51a of the lock release lever 51 of the mast lock portion 100a is provided at the tip of the lock release member 52.

The lock releasing member 52 is arranged so that the engaging portion 59 can be engaged with the engaging surface 51a of the lock releasing lever 51 when the tension pulley 57 receives the tension of the wire rope 31. .

A substantially horizontal arm 60 is integrally fixed to the support shaft 55, and a tension pulley 57 is connected to the wire rope 31 between the arm 60 and the spring receiving member 61. An urging member such as a coil spring that urges in the joining direction is interposed.

The spring receiving member 61 is vertically adjustable on a support arm 63 fixed to the support member 53, and the biasing force of the biasing member 62 can be adjusted by adjusting the screwing position of the lock nut 64. It has become.

Next, the operation of the above embodiment will be described.

When raising the illumination lamp 8, the winch 3
This is done by turning the handle 44 of No. 4 and winding the wire rope 31.

The tip of the wire rope 31 is also the fourth mast 14.
When the wire rope 31 is wound up, first, the fourth mast 14 moves upward. Then, when the fourth mast 14 is raised to the highest position, that is, the engaging member 24 of the fourth mast 14
3, the pin 38 of the mast lock portion 100a passes through the pin through hole 37 of the third mast 13 and the pin through hole 36 of the fourth mast 14 as shown in FIG. And the lower end of the fourth mast 14 is locked to the upper end of the third mast 13.

Further, when the handle 44 of the winch 34 is turned to wind up the wire rope 31, the third mast 13 moves upward, and when this reaches the highest position, the second mast 12 subsequently moves up. Moving.

In this way, the upper fourth mast 14 first rises, and then the lower third mast 13 and the second mast 12 gradually rise, so that the respective masts 14, 13 and 12 are at the highest positions. The lamp 8 reaches the maximum height in the state where the lamp 8 is raised.

The height of the illuminating lamp 8 is the same as that of the wire rope 3.
The height can be adjusted to an arbitrary height by adjusting the winding amount.

At this time, since the tension pulley 57 of the lock releasing portion 100b receives the tension of the wire rope 31, the engaging portion 59 of the lock releasing member 52 has the engaging surface of the lock releasing lever 51 of the mast lock portion 100a. 51a
Is positioned so that it can be engaged with.

Next, the descending operation of the ascending illumination lamp 8 is performed by rotating the handle 44 of the winch 34 in the reverse direction and feeding out the wire rope 31.

When the wire rope 31 is paid out, first, the second mast 12 is moved downward by gravity. And the second
When the mast 12 descends to the lowest position and the wire rope 31 is further extended, the third mast 13 begins to descend due to gravity.

When the third mast 13 descends to the vicinity of the lowest position, the engagement portion 59 of the lock release member 52 engages with the engagement surface 51a of the lock release lever 51 and urges the lock release lever 51. Outward against the biasing force of the member 40 (Fig. 1
(In the direction of arrow d), and the pin 38 is pulled out from the pin through hole 36 through the connecting rod 41 to unlock the fourth mast 14.

In this way, when the lock of the fourth mast 14 is released, the fourth mast 14 starts to descend due to gravity due to the wire rope 31 being unwound, and descends to the lowest position.

In this way, each mast 14, 13, 1
2 is automatically stored.

When the fourth mast 14 is locked at the highest position and the wire rope 31 should break, the tension pulley 57 loses the tension from the wire rope 31. The urging force of the urging member 62 causes the arm 60 to rotate in the direction of arrow a in FIG.
5, the tension pulley 57 rotates together with the tension arm 56 in the direction of arrow b, the lock release member 52 rotates in the direction of arrow c, and the engaging portion 59 of the lock release member 52 causes the lock release lever 51 to move. Move from the engagement position with and to the disengagement position. In this way, the lock release member 52 no longer engages with the lock release lever 51, and the fourth mast 14
Is held in the locked state by the mast lock portion 100a.

In this way, even if the wire rope 31 is cut off with the illuminating lamp 8 raised, the second mast 12 and the third mast 13 descend to the lowest position, but The 4 mast 14 does not descend to the lowest position. Therefore, it is possible to avoid danger to the human body and the like caused by the illumination lamp 8 attached to the uppermost mast caused by the lowering of the mast.

[0067]

As is apparent from the above description, the floodlight of claim 1 is provided with the mast lock portion for locking the mast at the uppermost position of the uppermost mast to which the illumination lamp is attached. When the top mast rises to the highest position,
The mast is locked by the action of the mast lock portion.

Further, when the uppermost mast is stored, the locked state of the mast lock portion is released, and when the uppermost mast descends due to an unexpected situation, the mast lock portion is held in the locked state. Since the portion is provided, when the uppermost mast is stored, the lock of the mast lock portion is automatically released by the action of the lock release portion. Therefore, all the masts can be automatically stored.

In the unlikely event that the wire rope breaks, the lock release portion does not act, and the mast lock portion is held in the locked state by the mast lock portion and does not descend to the lowest position. Therefore, it is possible to avoid the danger to the human body and the like due to the illumination lamp attached to the uppermost stage.

According to the invention, the floodlight of claim 2 is the floodlight of claim 1 in which a pin through hole is formed in the lower end of the uppermost mast and the uppermost mast is fitted therein. A pin that can be inserted into and removed from the pin through hole is provided at the upper end of the next mast,
Since this pin is elastically biased by the biasing member in the direction of insertion into the pin through hole, the pin is automatically inserted into the pin through hole when the uppermost mast reaches the highest position. Therefore, the uppermost mast can be automatically locked.

According to a third aspect of the present invention, in the light projector according to the first or second aspect, when the tension pulley receives the tension of the wire rope, the lock release member engages with the lock release lever of the mast lock portion. Therefore, when the uppermost mast locked in the mast lock portion is stored, the lock release member of the mast lock portion engages with the lock release member to lock the mast lock portion. Automatically release. Therefore, all the masts can be automatically stored.

Further, when the tension pulley loses the tension from the wire rope, the lock release member moves from the engagement position with the lock release lever of the mast lock portion to the disengagement position, so that the uppermost mast is at the highest position. If the wire rope is broken when locked with the lock release member, the lock release member does not engage with the lock release lever of the mast lock section, so the top mast is locked by the mast lock section. It is held at and never descends to the lowest position.

Therefore, it is possible to avoid the danger to the human body and the like caused by the illumination lamp attached to the uppermost stage and improve the safety.

[Brief description of the drawings]

FIG. 1 is a side view showing a mast lock device according to an embodiment of the present invention.

FIG. 2 is a front view showing a mast lock device according to an embodiment of the present invention.

FIG. 3 is a sectional view showing a mast lock portion of the mast lock device according to the embodiment of the present invention.

FIG. 4 is a front view of a floodlight according to an embodiment of Japanese Patent Application No. 6-276211.

FIG. 5 is a side view of a floodlight according to an embodiment of Japanese Patent Application No. 6-276211.

FIG. 6 is a cross-sectional view showing a mast relationship of a floodlight according to an embodiment of Japanese Patent Application No. 6-276211.

FIG. 7 is a cross-sectional view showing a mast lifting device of a floodlight according to an embodiment of Japanese Patent Application No. 6-276211.

FIG. 8 is a sectional view showing an example of a mast lock device of a floodlight according to an embodiment of Japanese Patent Application No. 6-276211.

[Description of sign]

 4 chassis 5 generator 7 lifting device 8 lighting 11 to 14 mast 25 to 28 pulley 31 wire rope 33 pulley 34 winch 37 pin through hole 38 pin 40 coil spring (biasing member) 51 lock release lever 52 lock release member 56 Tension arm 57 Tension pulley 62 Coil spring 100 Mast lock device 100a Mast lock part 100b Lock release part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuki Yamato 272 Higashiuchino, Kawaguchi City, Saitama Prefecture Wako Machinery Co., Ltd. (72) Inventor Jinichi Kuroi 272 Higashiuchino Kawaguchi City, Saitama Prefecture Wako Machinery Co., Ltd.

Claims (3)

[Claims] 1. A movable chassis, a generator fixedly mounted on the chassis, and a telescopic lifting device equipped with an illuminating lamp at an upper end thereof, wherein the lifting device is sequentially stepped from bottom to top. It consists of a plurality of masts that are slenderly fitted and inserted into each other.A winch is provided at an appropriate midway position of the lowermost mast, and a pulley is arranged at the upper end of the mast, and the masts are inserted into the masts in a stepwise manner. Pulleys are arranged at the upper end and the lower end, and wire ropes, one end of which is locked at the lower end of the uppermost mast, are fitted into each other.The pulleys at the upper end of the mast are successively hung from the pulleys at the lower end. In a projector in which the other end is locked to a winch via a pulley at the upper end of the lowermost mast, the mastlock for fixing the mast at the uppermost mast is the uppermost mast, and The mast lock part when storing the upper mast A mast lock device comprising a lock release part for releasing the locked state of the mast lock and for holding the mast lock part in the locked state when the uppermost mast drops due to an unexpected situation. Machine. 2. The floodlight according to claim 1, wherein the mast lock portion includes a pin through hole formed in a lower end portion of the uppermost mast and a mast of the next stage into which the uppermost mast is inserted. A pin that is provided at the upper end and that can be inserted into and removed from the pin through hole, an urging member that elastically urges the pin into the pin through hole, and a pin that moves in the direction to separate the pin from the pin through hole. A floodlight, which comprises a lock release lever for locking the light. 3. The floodlight according to claim 1, wherein:
The lock releasing portion is provided on a lowermost mast, and a tensioning arm provided with a tensioning pulley that receives tension of a wire rope between a pulley and a winch disposed on an uppermost portion of the lowermost mast, and the tensioning arm. A lock release member that is interlocked and is movable to an engagement / disengagement position of the lock release lever of the mast lock portion, and a biasing member that biases the tension arm in the direction of engagement with the wire rope. The lock release member is located at the engagement position with the lock release lever when the pulley receives the tension of the wire rope, and the lock release member engages with the lock release lever when the tension pulley loses the tension from the wire rope. A floodlight characterized by being moved from a position to a release position.