JP3564676B2 - Pole drop prevention device for portable lighting equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is provided in a portable lighting device in which the height position of an illuminator attached to the upper end of a movable pole can be freely changed by the expansion and contraction operation of the movable pole, and prevents the movable pole from falling when a wire breaks. The present invention relates to a pole fall prevention device capable of ensuring safety and avoiding damage to a portable lighting device.
[0002]
[Prior art]
2. Description of the Related Art A portable lighting device in which a lighting device is attached to an upper end of a pole erected on a movable engine generator body is known. Some portable lighting devices are provided with an integrated generator, and such portable lighting devices are widely used in recent years because they are convenient for use on construction sites and athletic fields at night. Has been reached. By the way, the portable lighting device as described above has a fixed pole erected on the engine generator main body, and a movable pole telescopically fitted in a hollow portion of the fixed pole, By unwinding and winding up a wire connected to the movable pole via a guide pulley by a winch attached to a fixed pole, the movable pole can be expanded and contracted to freely change the height position of the illuminator. is there.
[0003]
FIG. 6 is an explanatory view of a known pole extending / contracting means for extending / contracting a movable pole, and is a longitudinal sectional view of an upper portion of a fixed pole. A winch (not shown) is provided in the middle of the fixed pole 4, and a wire 8 extending from a winding drum of the winch passes through a guide pulley 11 provided above the fixed pole 4 to form a hollow portion in the fixed pole 4. Is led to. The distal end of the wire 8 is connected to a connecting portion 5 a of the movable pole 5 via a pulley 9 attached to the lower end of the movable pole 5. When the winding drum is rotated to wind the wire 8 with the winch (in FIG. 6, the winding direction of the wire 8 is indicated by an arrow Z), the wire 8 pulls up the lower end of the movable pole 5 via the pulley 9. Then, the movable pole 5 extends from the fixed pole 4 in the direction of arrow Y in the figure to raise the illuminator attached to the upper end. After raising the illuminator to a predetermined height position, the winding operation of the winch is stopped and the winding drum is locked so that the movable pole 5 does not drop due to the tension of the wire 8.
[0004]
However, the portable lighting device as described above is often used outdoors due to its nature, and the wire may be broken during use due to corrosion or rust. In addition, the frequent movement of the portable lighting device or the change of the height position of the lighting device may cause the wire to be fatigued and cut. In such a case, if there is a person near the portable lighting device, the illuminator that has fallen directly hits the person, causing serious personal injury or damaging the portable lighting device due to the impact of the fall. There was a problem.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide a highly reliable portable fall prevention device using a two-stage mechanism of a first moving unit and a second moving unit. And
[0006]
[Means for Solving the Problems]
To achieve the above object, the pole fall prevention device of the present invention comprises a fixed pole erected on the movable engine generator body, one or arranged telescopically inserted into the fixed pole A plurality of movable poles, an illuminator provided above the movable pole, a guide pulley provided on the front surface of the fixed pole, a wire connected to the movable pole via the guide pulley , and the wire in portable lighting device having a pole expansion means comprising a winch for stretching the movable pole by out entrainment or winding, it is one or more formed along the stretch direction on the rear surface of the movable pawl engaging parts and is secured above the winch said guide pulley is rotatably supported by a support member, said guide pulley is provided on the support member Consists biasing means shaft for rotatably supporting biases the shaft movably guiding guide groove in the stretch direction, and both end portions always upper side of the shaft as well as projecting from opposite sides of said support member the winch is provided on the guide pulley is the guide and the first moving means adapted to move downwardly along the groove, the side surface of the fixed pawl is fitted to the fixed pole when involving the wire guide wherein the slider has a rear portion which faces the rear surface of the expansion and contraction direction and move forwards and backwards in a direction perpendicular fixed pole, and a stopper formed to project toward the hole provided in the rear surface of the fixed pole to a rear portion of the slider by, to approach the more fixed pole upward to engage movably with the shaft protruding from the guide groove formed at the tip of the left and right side surfaces of the slider And a formed inclined groove consists of a second moving means for converting the movement of the expansion and contraction direction of the first moving means via the inclined groove in the moving direction of the slider perpendicular to the stretching direction by Rukoto engaged with the stopper at the time of cutting of the wire to the engaging portion of the movable pawl, characterized in that so as to forcibly prevent the falling of the movable pole.
Further, in the above-described pole fall prevention device, in addition to the urging means, or in place of the urging means , a second urging means for urging the slider in a direction orthogonal to the expansion and contraction direction may be provided. Good.
[0007]
Embodiment
A preferred embodiment of the present invention will be described with reference to the drawings. In the following description, “front” refers to the left side of the drawing, and “rear” refers to the right side of the drawing.
[0008]
First, the overall configuration of the portable lighting device will be described with reference to FIG.
On the front surface of a movable engine generator body 1 to which wheels 3 are attached, a rectangular cylindrical fixed pole 4 is vertically provided on the front surface. A movable pole 5 that can expand and contract in the vertical direction (the direction indicated by the arrow Y in the figure, hereinafter referred to as the Y direction) is fitted into the fixed pole 4. Reference numeral 2 denotes a control panel such as a generator. The illuminator 6 is attached to the upper end of the movable pole 5 so that the height of the movable pole 5 can be adjusted together with the expansion and contraction of the movable pole 5 as shown by a two-dot chain line in the figure. Reference numeral 7 denotes a known winch that has a winding drum (not shown) that winds the wire 8 and that unwinds and winds the wire 8 by rotating the winding drum. I have. Note that the winch 7 does not necessarily need to be provided on the fixed pole 4 and may be provided on the engine generator main body 1 side as long as the wire 8 can be unwound and wound.
[0009]
[Description of First Embodiment of the Present Invention]
Next, a pole fall prevention device of the present invention in the first embodiment will be described with reference to FIGS.
FIG. 1 is a perspective view of a pole fall prevention device of the present invention, and FIG. 2 is a cross-sectional side view of a main portion illustrating the operation of the pole fall prevention device of the present invention.
Guides 14 are provided on two parallel left and right side surfaces 4c on the upper side of the fixed pole 4 having a square cross section. The guides 14, 14 are attached to the side surface 4c by welding or bolts. In the drawing, reference numeral 14a is a cover provided on the guides 14, 14. The slider 15 is provided to be able to move forward and backward in the front-rear direction (the direction indicated by the arrow X in the figure, hereinafter referred to as the X direction) while being guided by the guides 14. The slider 15 includes a side surface portion 15a guided by the guides 14 and a rear portion 15b facing the rear surface 4b of the fixed pole 4, and is formed so as to have a U-shape in plan view as a whole. Have been. The slider 15 is movable back and forth in the X direction perpendicular to the Y direction of the movable pole 5 while being guided by the guides 14 and 14.
[0010]
A guide pulley 11 for guiding the wire 8 extended from the winch 7 to the inside of the fixed pole 4 is provided on the front surface 4 a on the upper part of the fixed pole 4. That is, the support member 13 of the guide pulley 11 is fixed to the front surface 4a opposite to the rear surface 4b of the fixed pole 4 with which the rear portion 15b of the slider 15 contacts, and the guide pulley 11 is fixed to the shaft 12 whose both ends are supported by the support member 13. It is rotatably mounted. On both sides of the support member 13, a linear guide groove 13a is formed in the Y direction. On the other hand, an inclined groove 17 intersecting the guide groove 13a is formed in a side surface portion 15a of the slider 15 protruding from the side surface 4c of the fixed pole 4 to the front surface. The inclined groove 17 is formed so as to approach the fixed pole 4 as going upward. The shaft 12 of the guide pulley 11 penetrates the guide groove 13a and engages with the inclined groove 17, and both ends thereof are provided with retaining means by washers and pins. According to this aspect, the shaft 12 and the guide pulley 11 are movable in the Y direction along the guide groove 13a. However, when the shaft 12 moves in the Y direction, the slider 15 is moved by the inclined groove 17 , 14 while moving in the X direction.
[0011]
A bracket 16a is provided above the guide pulley 11 of the fixed pole 4, and between the bracket 16a and the shaft 12, biasing means is provided with the guide pulley 11 therebetween, for example, two tension coils in this embodiment. A spring 16 (hereinafter, referred to as a spring 16) is stretched. The shaft 12 is constantly urged upward by the spring 16. The springs 16 are the same so that a uniform biasing force can always be applied to the shaft 12. When the wire 8 is not wound around the guide pulley 11 or when no tension T acts on the wire 8, the shaft 12 moves upward in the Y direction along the guide groove 13 a by the urging force of the spring 16. However, since the shaft 12 is always engaged with the inclined groove 17, a force to move the slider 15 forward in the X direction is applied to the slider 15.
[0012]
A pin-shaped stopper 18 protrudes from a rear portion 15 b of the slider 15 toward the rear surface 4 b of the fixed pole 4. On the other hand, a hole 4d into which the stopper 18 can be inserted and removed is formed in the rear surface 4b of the fixed pole 4. The shape of the stopper 18 is not limited to the pin shape, but may be a block shape or another shape. However, when the slider 15 moves until the rear portion 15b contacts the rear surface 4b, the hole of the fixed pole 4 is removed. The movable pole 5 must be capable of being inserted into the fixed pole 4 from the position 4d and engaging with the falling movable pole 5 to prevent the movable pole 5 from falling.
[0013]
The movable pole 5 is provided with an engaging portion 5b that can engage with the stopper 18. The engaging portion 5b may be a lower end edge of the movable pole 5, or a hole 5c in the rear surface of the movable pole 5 which is in sliding contact with the rear surface 4b of the fixed pole 4 and in which a stopper 18 can be inserted or removed. A plurality may be formed at appropriate intervals along the length. In this case, the periphery of the upper hole of the hole 5c becomes the engaging portion 5b that engages with the stopper 18. In the case where a plurality of holes 5c are formed along the Y direction, since the stopper 18 engages with one of the holes 5c to prevent the movable pole 5 from dropping, the wire 8 can be used during the operation process in which the movable pole 5 is extended or retracted. Even if it breaks, the movable pole 5 can be reliably prevented from falling, and is characterized in that it is safer. The first moving means A for two-stage movement using the wire 8, the guide pulley 11, the shaft 12, the support member 13, the guide groove 13a, the spring 16 and the like includes guides 14, 14, the slider 15, the inclined groove 17 and the like. The second moving means B is constituted by the above.
[0014]
[Action]
Next, the operation of the pole fall prevention device having the above configuration in this embodiment will be described with reference to FIG.
When the illuminator 6 is lifted by extending the movable pole 5 from the fixed pole 4 or when the illuminator 6 is held at a high position, the tension T acts on the wire 8 and the guide pulley 11 and the shaft A downward force acts on 12. Since this downward force is sufficiently greater than the urging force of the spring 16, the shaft 12 moves downward in the Y direction along the guide groove 13a against the urging force of the spring 16. The downward movement of the shaft 12 along the guide groove 13a in the Y direction moves the slider 15 rearward in the X direction through the inclined groove 17, so that the rear portion 15b of the slider 15 is separated from the rear surface 4b of the fixed pole 4. I do. That is, when a certain degree or more of tension is applied to the wire 8, the stopper 18 is completely removed from the hole 4 d of the fixed pole 4 so that the movable pole 5 does not interfere with expansion and contraction. (The state of FIG. 2A).
[0015]
When the wire 8 breaks, the movable pole 5 tries to drop along the Y direction. Further, since the downward force acting on the guide pulley 11 and the shaft 12 is eliminated by the tension T of the wire 8, the guide pulley 11 and the shaft 12 move upward in the Y direction along the guide groove 13a by the urging force of the spring 16. I do. The upward movement of the shaft 12 in the Y direction is converted by the inclined groove 17 into the forward movement of the slider 15 in the X direction. Since the slider 15 moves until the rear portion 15b comes into contact with the rear surface 4b of the fixed pole 4, the stopper 18 is inserted into the fixed pole 4 from the hole 4d. Although there is a slight time lag between the breaking of the wire 8 and the insertion of the stopper 18 into the hole 4d, the engaging portion 5b of the movable pole 5 is located above the stopper 18 so that the movable pole 5 is securely stopped. 18 and is prevented from falling (the state shown in FIG. 2C). In this case, as shown in FIG. 2B, the movement of the slider 15 may be temporarily restricted by the stopper 18 abutting on the rear surface of the movable pole 5 between the holes 5c. When the hole 5c of the pole 5 is lowered to the height position of the stopper 18, the restriction is released and the slider 15 can be moved forward in the X direction, and the movable pole 5 is prevented from dropping. There is no. As described above, in the first embodiment of the present invention, when the wire 8 is cut, the shaft 12 of the first moving unit A is first moved upward in the Y direction, and the slider of the second moving unit B is moved via the shaft 12. Since the stopper 18 is engaged with the engagement portion 5b of the movable pole 5 as a two-stage mechanism for moving the movable member 15 to the front side in the X direction, the movable pole provided with an illuminator, which is a heavy object, falls quickly from a high position. However, the stopper 18 is instantaneously engaged with the engaging portion 5b of the movable pole, and the stopper 18 is not released by a strong impact when dropped.
[0016]
[Description of Second Embodiment of the Present Invention]
Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment of the present invention shown in FIG. 3, a block-shaped stopper 18 'is attached to the rear portion 15b of the slider 15 instead of the pin-shaped stopper 18 shown in the first embodiment. By making the shape of a block, the length of the stopper 18 ′ along the Y direction can be made large, and the strength is improved, so that the illuminator 6 is heavy or a plurality of movable poles 5 are provided. This is advantageous when a multi-stage portable lighting device is used.
[0017]
[Third embodiment of the present invention]
FIG. 4 is a partially cutaway side view of a pole fall prevention device according to a third embodiment of the present invention.
In the first and second embodiments, the shaft 12 is always urged upward in the Y direction by two tension coil springs 16, and when the wire 8 is cut by the urging force of the spring 16, the slider 15 (see FIG. 1, see FIG. 3). In the third embodiment, the compression as a second urging means for operating the stopper 18 '(18) when the wire 8 is cut. A coil spring 19 is provided. In the third embodiment, a compression coil spring 19 may be provided in addition to the spring 16 described in the first and second embodiments, but a compression coil spring 19 is provided instead of the spring 16. It may be something.
[0018]
As shown in FIG. 4, a substantially U-shaped bracket 20 is attached to the rear surface of the fixed pole 4 when viewed from the side, and the bottom portion 20a of the bracket 20 and the rear portion 15b 'of the slider 15' face each other. A cylindrical spring receiving portion 15c 'for preventing the compression coil spring 19 from dropping is formed on the rear portion 15b ' of the slider 15 ', and one end of the compression coil spring 19 is fitted into the spring receiving portion 15c'. ing. Of course, as long as the compression coil spring 19 can be prevented from falling off, the receiving portion is not limited to the above-described cylindrical spring receiving portion 15c ', and may have another form. The other end of the compression coil spring 19 is in contact with the bottom 20a of the bracket 20, and constantly biases the slider 15 'forward in the X direction. One or more compression coil springs 19 may be provided. However, in order to allow the slider 15 ′ to move smoothly forward while being guided along the guides 14, 14, the compression coil spring 19 may be used. The spring 19 is desirably arranged so that the biasing force can be evenly distributed to the rear surface of the slider 15 '. If the slider 15 'can always be biased forward in the X direction by a biasing means such as a spring, one end of a tension coil spring attached to the fixed pole 4 is attached to the slider 15', and the slider 15 ' ′ May be constantly applied with a pulling force (biasing force).
[0019]
Although the preferred embodiment of the present invention has been described, the present invention is not limited to the above embodiment. For example, in the above-described embodiment, a portable lighting device that includes only one movable pole 5 and can adjust the height position of the illuminator 6 in two levels is described. It is needless to say that the present invention can be applied to other portable lighting devices whose height position can be adjusted. Further, in the third embodiment, the compression coil spring 19 as the urging means may be provided in addition to the spring 16 as the urging means, or in place of the spring 16. Not only the compression coil spring 19 but also a leaf spring or the like may be used as long as it can be urged in the X direction.
[0020]
【The invention's effect】
Since the present invention is configured as described above, the urging means using the tension of the wire is operated when the wire is cut, and the axis of the first moving means is moved upward in the Y direction (extension and contraction direction) . A two-stage mechanism for moving the slider of the second moving means forward in the X direction (a direction perpendicular to the direction of expansion and contraction) via the shaft. Even if the movable pole with the illuminator, which is a heavy object, falls rapidly from a high position, the stopper will instantly engage with the engaging portion of the movable pole, Even when a strong impact is applied, the slider and the axis of the first moving means are configured to operate in the XY directions, so that the slider is not moved rearward in the X direction, and Movable pole can be prevented from falling, preventing personal injury Damage or lighting device can be prevented.
[0021]
Further, in the apparatus provided with the second biasing means for biasing the slider in the X direction in addition to the biasing means in the Y direction, the slider can be moved more quickly and one of the biasing means can be disconnected. In this case, the other urging means surely moves the slider, so that the reliability of the pole drop prevention device can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the entire configuration of a pole fall prevention device according to a first embodiment of the present invention.
FIGS. 2A and 2B are side views for explaining the operation of the pole drop prevention device of the present invention, wherein FIG. 2A shows a state before the wire is cut, FIG. 2B shows a state when the wire is cut, and FIG. 5 shows a state when engaged with the engaging portion of the movable pole.
FIG. 3 is a partially cutaway side view of a pole fall prevention device according to a second embodiment of the present invention.
FIG. 4 is a partially cutaway side view of a pole fall prevention device according to a third embodiment of the present invention.
FIG. 5 is a side view illustrating the overall configuration of the portable lighting device.
FIG. 6 is an explanatory view of a pole extending / contracting means for extending / contracting a movable pole, and is a longitudinal sectional view of an upper end portion of a fixed pole.
[Explanation of symbols]
A first moving means B second moving means 1 engine generator main body 2 control panel 3 wheels 4 fixed pole 4a front face 4b rear face 4c side face 4d hole 5 movable pole 5a connecting part 5b engaging part 5c hole 6 illuminator 7 winch 8 wire 9 Pulley 10 Pole fall prevention device 11 Guide pulley 12 Shaft 13 Support member 13a Guide groove 14 Guide 14a Cover 15, 15 'Slider 15a Side surface portion 15b, 15b' Rear portion 15c 'Spring receiving portion (receiving portion)
16 Tension coil spring (biasing means)
17 Inclined grooves 18, 18 'Stopper 19 Compression coil spring ( second biasing means)
20 Bracket T Wire tension

Claims (3)

A fixed pole (4) erected on the movable engine generator body (1);
One or a plurality of movable poles (5) which are inserted into the fixed poles and are provided so as to be stretchable;
An illuminator (6) provided above the movable pole,
Guide pulley provided on the front surface of the fixed pawl (11) consists of a winch which stretch the movable pawl and the guide pulley wires connected to the movable pole through, and by out entrainment or winding the wire In a portable lighting device having a pole extension means,
One or more engaging portions (5b) formed on the rear surface of the movable pole along the direction of expansion and contraction;
Support member in which the guide pulley is fixed above the winch is rotatably supported (13), from both sides of the axis for rotatably supporting the guide pulley provided on the support member (12) is the support member guide grooves for guiding movably the shaft to the stretch direction while protruding (13a), and makes the both end portions of the shaft from the constantly biasing means for biasing the upper side (16), said winch the wire A first moving means (A) in which the guide pulley moves downward along the guide groove when being rolled in;
Rear facing the surface (4b) after the is fitted to the fixed pole provided on a side surface of the fixed pawl guide (14, 14) move forwards and backwards in the direction perpendicular to the stretching direction by the fixing pole (4) ( a slider (15) having a 15b), and said slider rear (15b) to the fixed pole of the rear surface (stopper formed to protrude into a hole provided in 4b) (4d) (18), right and left of the slider An inclined groove (17 ) formed to approach the fixed pole (4) as it moves upward to movably engage with the shaft protruding from the guide groove (13a) formed at the tip of both side surfaces (15a). ) and has made from the second moving means for converting the movement of the expansion and contraction direction of the first moving means via the inclined grooves in the moving direction of the slider perpendicular to the stretching direction (B), and
The Rukoto engaged with the stopper at the time of cutting of the wire to the engaging portion of the movable pawl, pawl falls portable lighting device is characterized in that so as to forcibly prevent the falling of the movable pole Prevention device. 2. The pole fall prevention device for a portable lighting device according to claim 1, wherein the slider is urged in a direction orthogonal to the expansion and contraction direction in addition to the urging means or instead of the urging means . 3. A pole fall prevention device for a portable lighting device, comprising a biasing means (19). A receiving portion (15c ') is formed at a rear portion of the slider, and a bracket (20) is attached to the fixed pole so as to face the receiving portion, and the second urging means (19) is mounted on the receiving portion. The pole fall prevention device for a portable lighting device according to claim 2, wherein the slider is interposed between a rear portion of the slider and the bracket.

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