JPH113614A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost projector having a reliable safety mechanism and a simple structure. SOLUTION: A post 4 constituted of plural post members 11 and 12 is made telescopic through winding or unwinding of a wire rope 16. The lowermost or first post member 11 receives therein the second post member 12, which is formed in its one side with a plurality of locking parts 33 vertically positioned. The first post member 11 is mounted on its upper portion with a turnable stopper 38 adapted to engage with the locking parts 33. The stopper 38 is provided with a pulley 22, on which the rope 16 is hung. The tension of the rope 16 is thus applied to disengage the stopper 38 from the locking part 33. The stopper 38 and the first post member 11 are linked together by means of springs 48 stretched therebetween, which pull the stopper 38 into engagement with the locking parts 33. If the rope 16 snaps off, the stopper 38 is engaged with the locking part 33 to check vertical motion of the second post member 12 to the first post member 11.

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 example, at nighttime at a civil engineering work site.

[0002]

As a floodlight used for night lighting or the like on a civil engineering work site, for example, those disclosed in JP-A-8-138406 and JP-A-9-17226 are known. ing. The floodlights described in these publications are provided with a lighting device at the upper end of a telescopic support,
The height of the lighting device can be adjusted. The strut is formed by sequentially inserting a thin strut member inside a thick strut member (mast). One end of a wire rope is fixed to the lower end of the fourth strut member at the top, and the third strut member, the second strut member, and the like. The wire rope is wound around pulleys provided at the upper and lower ends of the support member and the upper end of the lowermost first support member, and the wire rope is unwound by a winch to which the other end of the wire rope is fixed to extend and retract the support. I try to make it.

[0003] In this type of floodlight, if the wire rope is cut, the support member may be rapidly shrunk and the lighting device may fall, and if the lighting device drops rapidly, the lighting device may not function properly. It is dangerous if it hits the human body easily or is damaged by the impact of falling. Therefore, the floodlight disclosed in the above publication is provided with a safety mechanism for preventing the lighting device from falling when the wire rope breaks.

In the light projector disclosed in Japanese Patent Application Laid-Open No. 8-138406, a pin that moves horizontally is provided at an upper end of a third support member, and the pin engages with a lower end of a fourth support member. A through hole is provided, and the pin is urged by a spring in a direction to engage with the through hole. If the fourth support member is at the ascending limit position with respect to the third support member, the pin is engaged with the through hole. Therefore, when the wire rope is broken, even if the second support member and the third support member descend, the fourth support member does not descend relative to the third support member. In order to lower the fourth support member with respect to the third support member, it is necessary to operate the pin to pull out the through-hole. The same is true even when the wire rope is not broken, and when the support is contracted, it takes time to operate the pin in addition to the winch.

The safety mechanism of the floodlight described in Japanese Patent Application Laid-Open No. 9-17226 utilizes the same pin,
Eliminates the need to operate the pins when the support is normally retracted. Therefore, an unlocking member is provided above the first support member, and when the third support member descends, the unlocking member pushes an unlock lever fixed to the pin so that the pin can be removed from the through hole. . The lock release member is rotatably supported by the first support member, and is urged by a spring in a direction to be released from the lock release lever. Further, a wire rope is hung on a pulley provided on a tension arm fixed to the unlocking member, and the tension of the wire rope causes the unlocking member to rotate in a direction opposite to a biasing direction by a spring. . Therefore, in the normal state where the wire rope is not broken, the unlocking member engages with the pin as described above,
The fourth support member can descend with respect to the third support member. On the other hand, when the wire rope breaks, the spring moves the unlocking member to a position where it cannot be engaged with the unlocking lever, the pin does not fall out of the through hole, and the fourth support member does not descend with respect to the third support member.

However, in this conventional floodlight, if the fourth support member does not rise to the upper limit relative to the third support member,
Since the pin does not engage with the through-hole, if the wire rope is cut before the fourth support member is fully extended when the support is extended, the safety mechanism will not operate and the lighting device will drop together with the fourth support member. There was a problem. this is,
The same applies to the light projector described in JP-A-8-138406. Further, in addition to the stopper mechanism composed of a pin or the like, a stopper release mechanism composed of a lock release member, a spring, a pulley, or the like is provided, so that the structure is complicated, the processing cost is increased, and the reliability of operation is reduced. There was a problem. That is, since there are many components of the stopper mechanism and the stopper release mechanism, the possibility of breakage increases,
There is a problem with reliability. In addition, the stopper mechanism and the stopper release mechanism are configured such that, even during normal use, a portion that slides with each other as the support member moves up and down (a contact portion between the lock release lever and the lock release member, and a pin and the lock release lever are connected). The contact part between the connecting rod and the case supporting it)
With the use, there is a possibility that the wear of the sliding portion progresses with the use and a backlash is generated, and the stopper mechanism and the stopper release mechanism do not operate normally. In addition, when the support is contracted for a long period of time and left outdoors, the connecting rod and the case are fixed by rust and the pin is not inserted into the through hole, that is, the support member is not locked, and the safety is reduced. The mechanism may not work. Further, when the wire rope is broken, the unlocking member pivots to the winding side, so that there is a possibility that the unlocking member may hit a person performing the winding operation.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide an inexpensive light projector having a highly reliable safety mechanism.

[0008]

In order to achieve the above-mentioned object, the present invention comprises a plurality of column members which are gradually reduced in thickness, and a thin column member is inserted sequentially inside a thick column member so as to be vertically oriented. , A lighting device provided at the upper end of the thinnest uppermost strut member, a wire rope fixed at one end to the lower end of the uppermost strut member, and a middle strut A guide member provided at the upper and lower ends of the member and the upper end of the thickest lowermost strut member and over which the wire rope is wound, and a winch to which the other end of the wire rope is fixed, In the light projector for expanding and contracting the column by unwinding, a plurality of locking portions arranged vertically are provided on a side surface of the column member inserted inside the lowermost column member, and the lowermost column is provided. Top of member A stopper that engages with the engaging portion from the opening when the rotating hole is rotatable toward the support column is provided, and the guide member is provided on the stopper. The wire rope is wound around the wire rope, and the tension of the wire rope is caused to rotate so that the stopper is disengaged from the locking portion. The stopper is locked between the lowermost support member and the stopper. And a spring for rotating in a direction engaging with the portion.

When the wire rope is wound around the winch, the distance between the guide members of the adjacent support members becomes short.
A column composed of these column members extends. In addition, the support members gradually rise from the inside. Conversely, when the wire rope is paid out from the winch, due to gravity, the strut members sequentially descend from the outer one, and the struts shrink. At the upper end of the lowermost strut member, the wire rope is hung on the guide member provided on the stopper, and if the wire rope is not cut, the tension of the wire rope causes the stopper to lower the lower end against the spring. Are not engaged with the locking portions of the support member inside the support member. Therefore, the pillar member inside the lowermost pillar member can move up and down. On the other hand, when the wire rope breaks, the tension of the wire rope is lost, so that the stopper is rotated by the force of the spring, and engages with the locking portion from the hole, so that the innermost portion of the lower pillar member is in contact with the lowermost pillar member. Stop the lowering of the support member. Moreover, since there are a plurality of locking portions arranged in the vertical direction,
Regardless of the position of the inner strut member relative to the lowermost strut member, the stopper immediately engages with the nearest locking portion when the wire rope is cut, and The lowering of the inner pillar member is stopped.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the floodlight according to the present invention will be described below with reference to the drawings. In FIG. 3 showing the entire floodlight, 1 is a base, and the base 1
And the generator 3 is mounted. On one side of the base 1, a column 4 that can expand and contract vertically is vertically provided, and a lighting device 5 is provided at an upper end of the column 4. The power generator 3 serves as a power source for the lighting device 5.

The column 4 has a plurality of column members 11, 12, 13, each having, for example, a rectangular tube shape and gradually reducing (thinning) the outer shape.
Consists of fourteen. Then, the second thickest second support member 12 is vertically slidably inserted from above into the thickest lowermost first support member 11, and the second thickest third support member 12 is inserted into the second support member 12. A support member 13 is inserted slidably up and down from above, and the thinnest uppermost fourth support member 14 is inserted into the third support member 13 slidably from above and below. Among them, a first support member 11 is fixed on the base 1, and the lighting device 5 is provided at an upper end of a fourth support member 14. The range in which the adjacent support members 11, 12, 13, 14 can move up and down with respect to each other is restricted. Although a configuration for this regulation is not shown, for example, an adjacent strut member
The stopper provided at the upper end of one of 11, 12, 13, and 14 comes into contact with the stopper provided at the lower end of the other.

The column 4 is expanded and contracted by unwinding the wire rope 16. As shown in FIG. 4, the wire rope 16 has one end fixed to a lower end of the fourth support member 14 and the other end fixed to a winch 17 provided on the first support member 11. Also,
Wire ropes 16 are pulleys 18, 19, 2 serving as guide members provided at the upper and lower ends of the third support member 13 and the second support member 12 and at the upper end of the first support member 11, respectively.
It is wrapped around 0, 21, and 22 in a zigzag pattern. Therefore, as shown in FIG. 4A, when the wire rope 16 is wound around the winch 17 from the state in which the support 4 is contracted, the fourth support 14 first rises with respect to the third support 13. After the fourth support member 14 reaches the upper limit with respect to the third support member 13, the third support member 13 rises relative to the second support member 12, and the third support member 13 is raised. After reaching the upper limit with respect to the second support member 12, the second support member 12 rises relative to the first support member 11. On the other hand, FIG.
As shown in FIG. 2B, when the wire rope 16 is drawn out from the winch 17 with the support 4 extended, first, the second support 12 descends with respect to the first support 11, and the second support 12 moves downward. After the member 12 reaches the lower limit with respect to the first support member 11,
The third support member 13 descends with respect to the second support member 12,
After the third support member 13 reaches the lower limit with respect to the second support member 12, the fourth support member 14 lowers with respect to the third support member 13.

As shown in FIGS. 1 and 2, the winch 17 is mounted on a support 26 fixed to the upper portion of the outer surface of the first support member 11 by a horizontal support shaft 27.
A handle 28 for rotating the 17 is provided.

The floodlight is provided with a safety mechanism 31 for preventing the column 4 from shrinking to the minimum length when the wire rope 16 is cut, thereby preventing the lighting device 5 from dropping. Next, the configuration of the safety mechanism 31 will be described. One side surface of the second support member 12, the third support member 13, and the fourth support member 14 has a vertical slit 32 extending over substantially the entire length thereof.
Each of the slits 32 is formed with an opening, and a plurality of notch-shaped locking portions 33 arranged at regular intervals in the vertical direction are formed on one side edge of the slit 32. The locking portion 33 is provided with a slit 32
It is almost all over one side edge. On the other hand, the first support member
A cutout hole 34 is formed at the upper end of the side surface of the eleventh portion so as to face the locking portion 33 and expose a part of the locking portion 33.

On both sides of the outer side surface of the first support member 11, bearing pieces 36 are fixed above the winch 17 and below the cutout holes 34. A stopper shaft 37 parallel to the support shaft 27 of the winch 17 is rotatably supported. A stopper 38 is fixed to the center of the stopper shaft 37 so as to protrude upward. Although this stopper 38 is rotatable only at a predetermined angle,
When the stopper 38 rotates toward the column 4, the upper end has an engaging projection 39 which engages with the locking portion 33 through the hole 34.

The pulley 22 is located at the center of the stopper 38.
Is rotatably mounted on a support shaft 41 parallel to the support shaft 27 of the winch 17. The wire rope 16 hung above the pulley 22 is formed on the side surface of the first support member 11. The first support member 11 is introduced from the through hole 42. Then, the tension of the wire rope 16 acts so as to rotate the stopper 38 in a direction away from the locking portion 33 and the hole 34.

Further, the stopper shaft 37 has a stopper
A pair of first spring receiving pieces 43 which are located with the sandwiched therebetween are fixed. On the other hand, screw rods 45 are horizontally movably supported by fixing pieces 44 fixed to both sides of the outer side surface of the first support member 11, respectively. The moving direction is a tangential direction of the rotation locus of the stopper 38. A double nut 46 is screwed to one end of the screw rod 45, and a second spring receiving piece 47 is fixed to the other end. A coil spring 48 is mounted between the second spring receiving piece 47 and the first spring receiving piece 43. These coil springs 48 apply a force to the stopper 38 to rotate in a direction in which the stopper 38 engages with the locking portion 33 of the column 4, but as long as the wire rope 16 is not broken.
The tension of the wire rope 16 exceeds the force of the coil spring 48, and the stopper 38 comes off the locking portion 33. The force applied by the coil spring 48 to the stopper 38 can be adjusted by adjusting the position of the double nut 46 on the screw rod 45.

Next, the operation of the above configuration will be described. When using the floodlight, the height of the illumination device 5 can be adjusted arbitrarily by extending and retracting the support 4. That is, if the wire rope 16 is wound around the winch 17 by turning the handle 28, the adjacent support members 11, 12, 13,
Because the distance between the 14 pulleys 18, 19, 20, 21, 22 is shorter,
The column 4 including the column members 11, 12, 13, and 14 extends. On the other hand, turn the handle 28 to move the wire rope 16
, The support members 12, 13, 14 are lowered by gravity, and the support 4 is contracted. As described above, when the support 4 is extended, it rises sequentially from the inner supports 12, 13, and 14, and when the support 4 contracts, the outer supports 12, 13, and 14 are contracted.
And descend sequentially.

In a normal state in which the wire rope 16 is not broken, the stopper 38 applies a coil spring 48 as shown by a solid line in FIG. Of the first support member 11, the other support members 12, 13, 14
Are not engaged with the locking portions 33. Therefore, the support members 12, 13, and 14 can move up and down with respect to the first support member 11 without being hindered by the stopper 38. Therefore, the column 4 can be extended and contracted from the minimum length to the maximum length only by turning the handle 28.

On the other hand, when the wire rope 38 is cut off for some reason, the tension of the wire rope 38 is lost, so that the stopper 38 is moved by the force of the coil spring 48 as shown by a two-dot chain line in FIG. 4 so that the locking projection 39 of the stopper 38 is inserted into the hole 34 of the first support member 11.
And engages with the locking portions 33 of the other support members 12, 13, and 14. More specifically, the locking projection 39 is provided only on the locking portion 33 of the second support member 12 or on the second support member 12 and the third support member 12.
Of the support member 13 of the second support member or the second support member
12, locking portion of third support member 13 and fourth support member 14
Engage with 33. The stopper thus engaged with the locking portion 33
38 is the first support member 11 with respect to the other support members 12, 13, 14
Stop descent. In addition, the locking portion 33 is a support member 12,
Since a plurality of the support members 13, 14 are arranged in the vertical direction over substantially the entire length, the first support member 11 is different from the other support members 12, 13, 14.
In any position, when the wire rope 16 is cut, the stopper 38 immediately engages with the nearest locking portion 33, and the other column members 12, 13, 14 with respect to the first column member 11. Stops descending. In this way, the lighting device 5 can be prevented from falling to the height of the human body, and safety is improved.

According to the configuration of the above embodiment, the safety mechanism 31 has a simple configuration, so that the cost can be reduced and the safety mechanism 31 can be reduced.
The operation reliability is also improved. In addition, the stopper 38 does not basically rotate in a normal use state in which the wire rope 16 is not broken, so that the wear of the stopper 38 and the like progresses with use, and the reliability of the safety mechanism 31 is reduced. It does not decline. Further, the stopper 38 and the first spring receiving piece 43 are small, and when the wire rope 16 is cut, the stopper 38 and the first spring receiving piece 43 rotate in the direction approaching the support, so that the human body is There is no risk of damage.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made. For example,
The way of attaching the spring for urging the stopper is not limited to the above embodiment. Further, the locking portion may be formed in a concave and convex shape on the side edge of the slit as in the above-described embodiment, or may be formed by a punched hole separated and lined up and down.

[0023]

According to the present invention, in a floodlight projector in which a column composed of a plurality of column members is expanded and contracted by a wire rope, a locking portion is provided on a side portion of the column member inserted inside the lowermost column member. A stopper is provided at the upper part of the lowermost column member so that a part of the locking portion is exposed and a stopper that is rotatable and engages with the locking portion from the hole when rotating toward the column. A stopper is provided with a guide member for hanging the wire rope, and the wire rope is laid over the wire rope. The tension of the wire rope acts so that the stopper rotates in a direction in which the stopper is released from the locking portion, and a gap between the lowermost pillar member and the stopper In addition, since a spring is provided for rotating the stopper in a direction in which the stopper is engaged with the locking portion, in a normal state in which the wire rope is not broken, the column is extended and contracted by only the operation of the winch for unwinding the wire rope. While it is bets, when the wire rope is cut, the stopper engages the engaging portion, to stop the descent of the inner strut member against the bottom of the strut member, thereby preventing the falling of the lighting device. In addition, since the configuration of the safety mechanism is simple, the safety mechanism can be manufactured at low cost and the reliability of the operation of the safety mechanism can be improved. In addition, since the stopper does not basically rotate in a normal use state in which the wire rope is not broken, wear of the stopper and the like progresses with use, and the reliability of the safety mechanism does not decrease. Absent. Furthermore, when the wire rope is cut, the stopper rotates in a direction approaching the support, so that there is no danger of injuring the human body.

[Brief description of the drawings]

FIG. 1 is a perspective view of the vicinity of a stopper showing one embodiment of a floodlight of the present invention.

FIG. 2 is a side view of the vicinity of the stopper, partially showing a cross section.

FIG. 3 is a side view of the whole of the same.

FIGS. 4A and 4B are explanatory views of the extension and contraction of the column, in which FIG. 4A shows a state where the column is contracted, and FIG. 4B shows a state where the column is extended.

[Explanation of symbols]

 Reference Signs List 4 support 5 lighting device 11 first support member 12 second support member 13 third support member 14 fourth support member 16 wire rope 17 winch 18, 19, 20, 21, 22 pulley (guide member) 33 Stop 38 Stopper 48 Coil spring (spring)

Claims (1)

[Claims] 1. A strut composed of a plurality of strut members that gradually become thinner, wherein a strut member is sequentially inserted inside a thick strut member so as to be vertically expandable and contractable, and a thinnest top strut member. A lighting device provided at the upper end of the support member, a wire rope having one end fixed to the lower end of the uppermost support member, and upper and lower ends of the intermediate support member and the upper end of the thickest lower support member. A light guide that includes a guide member provided with the wire rope and a winch to which the other end of the wire rope is fixed, and that expands and contracts the strut by unwinding the wire rope. A plurality of locking portions arranged in the vertical direction are provided on side surfaces of the pillar member inserted inside the pillar member, and a hole through which a part of the locking portion is exposed above the lowermost pillar member. And rotatable support A stopper is provided for engaging with the locking portion from the hole when turning toward the hook, and the guide member is provided on the stopper, and the wire rope is wound around the stopper. A spring is provided between the lowermost support member and the stopper so as to rotate in a direction in which the stopper is engaged with the locking portion. Floodlight.