JP4084819B2 - Elastic body - Google Patents

Description

  The present invention relates to a stretchable body composed of a plurality of hollow tubes, and more particularly to a stretchable body capable of preventing damage to a linear body provided therewith.

As an apparatus using a telescopic body, for example, there is a projector T ′ in which an illumination lamp 8 ′ is fixed above a telescopic support column 1 ′ formed from a plurality of hollow tubes (three in the following description). is doing.
As an example of the projector T ′, as shown in FIG. 10, two movable struts P1 ′ and P2 ′ are sequentially fitted in the hollow portion of the fixed strut P0 ′ erected on the pedestal 6 ′ so as to be movable. There is a device in which the illuminating lamp 8 ′ is fixed to the upper part of the support P2 ′. In the projector T ′, a wire (not shown) having one end fixed to the bottom surface of the movable support P1 ′ is connected to a winch 90 ′ via a pulley (not shown) fixed to the upper part of the fixed support P0 ′. The movable struts P1 ′ and P2 ′ are moved up and down along the fixed strut P0 ′ by winding the wire around the drum, and the height of the illumination lamp 8 ′ is adjusted.
The illumination lamp 8 ′ of the projector T ′ is connected to a generator 7 ′ installed on the pedestal 6 ′ via a power cable 3 ′.

  However, in the projector T ′, the power cable 3 ′ is fixed to the upper ends of the fixed column P0 ′ and the movable column P1 ′, and the power cable 3 ′ is loosened when the telescopic column 1 ′ is extended to the maximum. It is formed in a length that is substantially linear. Therefore, when the movable struts P1 ′ and P2 ′ are lowered to retract the telescopic strut 1 ′, the power cable 3 ′ is loosened in the middle, and as a result, the fixed strut P0 ′ and the movable strut P1 ′. The power cable 3 'is twisted or bent in the middle, or the power cable 3' is excessively frictioned between the outer wall surface of the fixed column P0 'and the movable column P1' and the power cable 3 '. As a result, the power cable 3 ′ may be damaged. Further, when the power cable 3 'is left loose in the middle, there is a problem in appearance that it looks very bad.

  The present invention has been made in order to solve the above-described problems, and the expansion and contraction that can prevent the accompanying linear body from being loosened regardless of the change in length due to expansion and contraction. The purpose is to provide a body.

The stretchable body of the present invention has been made to solve the above-mentioned problems, and has a hollow fixed tube, a movable tube fitted in and out of the fixed tube, and an upper portion fixed to the movable tube. A movable guide member comprising a long tubular member or a groove-shaped member which is provided so as to be movable along the longitudinal direction of the wall surface of the fixed tube , and wiring in the tube or groove along the movable guide member is, a stretchable material having a linear body having a fixed flexible up to the predetermined position of the fixed tube from the distal end of the movable tube, the wall of the fixed tube, in the longitudinal direction A lower frame that is slidable along the lower frame, and a brake mechanism that is built in the lower frame and presses the wall surface of the fixed tube to restrict sliding of the lower frame, and the movement guide member A lower part is connected to the lower frame.

The stretchable body of the present invention includes a hollow fixed tube, a hollow first movable tube fitted in and out of the fixed tube, and a hollow first tube in and out of the first movable tube. An elongated tubular member having an upper portion fixed to the second movable tube and movable along the longitudinal direction of the wall surface of the fixed tube and the wall surface of the first movable tube; A movement guide member composed of a groove-shaped member, and a flexibility that is wired in the tube or in the groove along the movement guide member and fixed from the tip of the second movable tube to a predetermined position of the fixed tube A linear body having a lower frame provided on a wall surface of the fixed tube so as to be slidable along a longitudinal direction of the fixed tube; A brake mechanism that presses the wall surface and restricts sliding of the lower frame, and the movement guide member Wherein the lower portion is connected to the lower frame.

Here, the said linear body is provided in order to connect the various apparatuses attached to the expansion-contraction body, and the cable, wire, rope, string, hose, etc. which are formed from the material which has flexibility. A linear long member such as various pipes.
Also, the moving guide member is a serving member as a guide when the movable tube infested from the fixed tube, Ru using a tube-shaped member or channel members that have a predetermined rigidity.
In addition, when using a tubular member for a movement guide member, it is possible to provide a linear body along the inside of a tubular member.
Further, the linear body guide wheel is a member that plays a role of assisting smooth movement of the linear body by changing the direction of the linear body around the linear body guide wheel. Etc. are preferably used.
Furthermore, fixing the linear body along the movement guide member does not mean that the movement of the linear body is completely restrained, but is free to move to some extent in the middle of the movement guide member. The degree may be secured. In addition, the linear body at a portion that is not fixed to the movement guide member can move.

According to the present invention, even when a series of operations for moving the movable tube in and out is performed, the linear guide is a tubular member or a groove-shaped member provided between the movable tube and the fixed tube. Since the shape of the linear body is held in the tube or in the groove along the movement guide member, the linear body is prevented from being loosened in the middle.

  ADVANTAGE OF THE INVENTION According to this invention, the expansion / contraction body which can prevent that the linear body which has the flexibility provided accompanying the expansion and contraction accompanying expansion / contraction loosens can be provided. . Accordingly, it is possible to prevent the linear body from being damaged, and to solve the appearance problem such as poor appearance.

Embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, a floodlight T as an example using the telescopic body of the present invention is an engine-driven generator (hereinafter referred to as “generator 7”) installed on a pedestal 6 that is movable by wheels 5. And a telescopic strut 1 (extensible body) fixed to the base 6 behind the generator 7. The telescopic column 1 is expanded and contracted to adjust the height of the illuminating lamp 8 which is fixed to the upper part and connected via the generator 7 and the power cable 3 (linear body), to a predetermined place. It is an apparatus for irradiating.

In addition, in each embodiment, since the structure of the said expansion-contraction support | pillar 1 differs, the following demonstrates the expansion-contraction support | pillar 1 mainly.
In the description of each embodiment, the same constituent elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[First Embodiment]
As shown in FIG. 2, the telescopic support column 10 of this embodiment is formed of a fixed support column P0 and one first movable support column P1. This telescopic support column 10 is a rectangular tube-shaped fixed support column P0 (fixed tube) erected on the pedestal 6 and a rectangular tube-shaped first movable column column that is fitted in the hollow portion of the fixed column P0 and is erected up and down freely. P1 (movable tube) is provided, and a coil spring (not shown) that is an urging means for applying an upward urging force to the first movable column P1 is provided in the hollow portion of the fixed column P0. ing.

  A rectangular upper frame 13 is fixed to the upper end portion of the first movable column P1. Further, a rectangular lower frame 14 having a size surrounding the outer diameter of the fixed column P0 and the first connecting pipe C1 is slidably provided on the wall surface of the fixed column P0. The outer wall surface of the upper frame 13 and the inner wall surface of the lower frame 14 are connected by a first connecting pipe C1 (movement guide member) that is a hollow long pipe material longer than the expansion / contraction length of the first movable column P1. . The first connection pipe C1 is provided so as to be substantially parallel to the outer wall surface of the first movable column P1, and the first connection pipe C1 and the lower frame 14 are arranged in the longitudinal direction of the wall surface of the fixed pipe P0. It can be raised and lowered along.

  A pair of cylindrical grip handles 60 are welded to the lower frame 14, and a brake mechanism that interlocks with a brake handle 61 is provided in the hollow portion of the grip handle 60. The brake mechanism includes a brake pad that presses the wall surface of the fixed column P0, a coil spring that applies an urging force in a direction close to the fixed column P0 to the brake pad, and a direction in which the brake pad is separated from the fixed column P0. And a shaft for applying the separation force.

  With this brake mechanism, in a normal state, the brake pad presses the outer wall surface of the fixed support P0 with the coil spring, so that the lower frame 14 is stationary due to the frictional force of the brake pad and the pressing force of the coil spring. Accordingly, the first movable column P1 fixed via the first connecting pipe C1 and the upper frame 13 is also stationary. Then, by clamping the brake handle 61 toward the grip handle 60, the shaft is pulled away from the fixed support P0, and the tensile force of the shaft is greater than the biasing force of the coil spring, so that the brake pad at the tip of the shaft is It will be separated from the outer wall surface of the fixed column P0 (hereinafter, this operation is referred to as “brake release operation”).

In addition, when the brake handle 61 is released in the state where the brake release operation is performed, a tensile force in a direction away from the fixed support P0 acting on the shaft is not generated, so that the brake pad is fixed to the fixed support by the biasing force of the coil spring. It is pressed against the outer wall surface of P0 (hereinafter, this operation is referred to as “brake operation operation”).
Since the lower frame 14 to which the grip handle 60 is welded and the upper frame 13 fixed to the first movable column P1 are connected by the first connection pipe C1, the brake release operation is performed in the state where the brake release operation is performed. The first movable column P1 can be moved to an arbitrary position by performing a brake operation after moving the grip handle 60 to a predetermined height position.

And the power cable 3 which connects the illumination lamp 8 of the upper part of the 1st movable support | pillar P1 and the generator 7 on the base 6 is the generator 7 from the edge part by the side of the adhering part with the upper frame 13 of the 1st connection pipe C1. After being wired inside the first connecting pipe C1 toward the end on the side, it is fixed to the lower frame 14 by a fixing tool 17 in the vicinity of the outlet portion, and further, the lower end portion of the fixed support P0 and the generator 7 It is fixed by a fixing tool 18 in the middle of the bowl-shaped support member 9 (see FIG. 1) that connects the upper surface.
Note that the length between the fixture 17 of the lower frame 14 of the power cable 3 and the fixture 18 of the support member 9 (hereinafter, this portion of the power cable 3 is referred to as a “power cable length adjuster”) (FIG. 1). Is wired with a margin so as to be longer than the length of expansion and contraction of the first movable column P1, and in this power cable length adjustment section, the slack of the power cable 3 accompanying the raising and lowering of the lower frame 14 is prevented. It can be adjusted (the same applies to the following embodiments and reference examples unless otherwise specified).

  Therefore, even when a series of expansion / contraction operations are performed on the expansion / contraction column 10, the power cable 3 is provided along the inside of the first connection pipe C1 provided between the first movable column P1 and the fixed column P0. The wiring is fixed and the length of the power supply cable 3 is adjusted only by the power supply cable length adjusting section in accordance with the expansion and contraction. Therefore, the shape of the power cable 3 is held linearly in the first connecting pipe C1, and does not sag in the middle. Accordingly, it is possible to prevent damage to the power cable 3 and the like, and to solve the appearance problem such as poor appearance.

[Second Embodiment]
As shown in FIGS. 3 and 4, the telescopic column 20 of this embodiment is formed of a fixed column P0 and two movable columns P1 and P2. The telescopic column 20 includes a fixed column P0, a first movable column P1 fitted in the fixed column P0, and a second movable column P2 fitted in the first movable column P1. A coil spring 11 for applying an upward biasing force to the first movable column P1 is provided in the hollow portion.
Further, an auxiliary column H protrudes upward from the center of the bottom surface of the hollow portion of the first movable column P1, and a pulley K is pivotally connected to the upper end of the auxiliary column H. A wire W provided between the inner bottom portion of the fixed column P0 and the inner bottom portion of the second movable column P2 is suspended on the pulley K.

A rectangular upper frame 13 is fixed to the upper end portion of the second movable column P2. Further, a rectangular lower frame 14 having a size surrounding the outer diameter of the fixed column P0 and the first connecting pipe C1 is slidably provided on the wall surface of the fixed column P0. The outer wall surface of the upper frame 13 and the inner wall surface of the lower frame 14 are connected by a first connecting pipe C1 that is longer than the sum of the lengths of expansion and contraction of the first movable column P1 and the second movable column P2. The first connection pipe C1 is provided so as to be substantially parallel to the outer wall surfaces of the first movable support pillar P1 and the second movable support pillar P2, and the first connection pipe C1 and the lower frame 14 are connected to the fixed pipe P0. It can be moved up and down along the longitudinal direction of the wall surface.
Moreover, with the above-described configuration, the first movable column P1 and the second movable column P2 can be moved in and out of the fixed column P0 and the first movable column P1, respectively.
In addition, the code | symbol 21 is a square-shaped upper frame fixed to the upper end part of the 1st movable support | pillar P1, and it is more preferable not to contact | abut with the 1st connection pipe C1.

And the power cable 3 which connects the illumination lamp 8 of the upper part of the 2nd movable support | pillar P2 and the generator 7 on the base 6 is the generator 7 from the edge part by the side of the adhering part with the upper frame 13 of the 1st connection pipe C1. After being wired inside the first connecting pipe C1 toward the end on the side, it is fixed to the lower frame 14 by a fixing tool 17 in the vicinity of the outlet portion, and further in the middle of the support member 9 (see FIG. 1). It is fixed by a fixing tool 18.
In addition, the length of the power cable length adjusting portion is wired in a state having a margin so as to be longer than the sum of the expansion and contraction lengths of the first movable column P1 and the second movable column P2.

  Therefore, even when a series of expansion / contraction operations are performed on the expansion / contraction column 20, the power cable 3 extends along the inside of the first connection pipe C1 provided between the second movable column P2 and the fixed column P0. Thus, the length of the power cable 3 is adjusted only by the power cable length adjusting section. Therefore, the shape of the power cable 3 is held linearly inside the first connecting pipe C1, and the same effect as in the case of the first embodiment is achieved without sagging in the middle. .

[First Reference Example]
As shown in FIG. 5 and FIG. 6, in the first reference example according to the embodiment of the present invention, a telescopic column 30 formed of a fixed column P0 and three movable columns P1 to P3 will be described as an example. The telescopic strut 1 is a fixed strut P0, a first movable strut P1 fitted in the fixed strut P0, and a pair of hollow movable struts P2 and P3 in the form of a square tube. Unit U1 (movable tube unit). In this movable strut unit U1, an inner square cylindrical third movable strut P3 is fitted in a hollow portion of an outer quadrangular tubular second movable strut P2, and the second movable strut P2 is a first movable strut. It is fitted in the column P1.

  A coil spring 11 for applying an upward biasing force to the first movable column P1 is provided in the hollow portion of the fixed column P0, and an upward force is applied to the second movable column P2 in the hollow portion of the first movable column P1. Each of the coil springs 11 'for applying a force is internally provided.

  Further, an auxiliary column H protrudes upward from the center of the bottom surface of the hollow portion of the second movable column P2, and a pulley K is pivotally connected to the upper end of the auxiliary column H. A wire W provided between the inner bottom portion of the first movable column P1 and the inner bottom portion of the third movable column P3 is suspended on the pulley K.

  A rectangular lower upper frame 33 is fixed to the upper end portion of the first movable column P1. In addition, a rectangular lower lower frame 34 having a dimension surrounding the outer diameters of the fixed column P0 and the first connection pipe C1 is slidably provided on the wall surface of the fixed column P0. The outer wall surface of the lower upper frame 33 and the inner wall surface of the lower lower frame 34 have such a length that the lower lower frame 34 is positioned near the upper end portion of the fixed column P0 when the first movable column P1 is raised to the maximum. They are connected by the first connecting pipe C1. The first connecting pipe C1 is provided so as to be substantially parallel to the outer wall surface of the first movable column P1, and the first connecting pipe C1 and the lower lower frame 34 are arranged in the longitudinal direction of the wall surface of the fixed pipe P0. It can be moved up and down along.

Similarly, a rectangular upper upper frame 35 is fixed to the upper end of the third movable column P3. In addition, on the upper side of the lower lower frame 34, a rectangular upper lower frame 36 having a size surrounding the outer diameter of the fixed column P0 and the second connecting pipe C2 is slidably provided on the wall surface of the fixed column P0. Yes. The outer wall surface of the upper upper frame 35 and the inner wall surface of the upper lower frame 36 are such that the upper lower frame 36 overlaps the lower upper frame 33 when the second movable column P2 and the third movable column P3 are raised to the maximum. Are connected by a second connecting pipe C2 (movement guide member) which is a hollow long pipe material. The second connecting pipe C2 is provided so as to be substantially parallel to the outer wall surfaces of the first movable column P1, the second movable column P2, and the third movable column P3, and the second connecting tube C2 and the upper lower frame. 36 is provided to be movable up and down along the longitudinal direction of the wall surfaces of the fixed column P0 and the first movable column P1.
In addition, the first movable strut P1, the second movable strut P2, and the third movable strut P3 are allowed to protrude and retract from the fixed strut P0, the first movable strut P1, and the second movable strut P2, respectively.

In addition, a rectangular frame member 37 is fixed to the upper end of the second movable column P2, and a pulley 38 (linear guide wheel) for bridging the power cable 3 is pivoted on the frame member 37. It is installed.
The power cable 3 that connects the illuminating lamp 8 on the upper part of the third movable column P3 and the generator 7 on the pedestal 6 is connected to the generator 7 side from the end of the second connecting pipe C2 on the fixed part side with the upper upper frame 35. Is connected to the inside of the second connecting pipe C2 toward the end of the second connecting pipe C2. Then, after passing through the upper pulley 38, the first connecting pipe C <b> 1 is wired inside the first connecting pipe C <b> 1 from the end on the fixing portion side to the lower upper frame 33 toward the end on the generator 7 side. In addition to being fixed to the lower lower frame 34 by the fixing tool 17 in the vicinity of the outlet portion, it is further fixed to the middle part of the support member 9 (see FIG. 1) by the fixing tool 18.

Next, operations of the telescopic support column 30 and the power cable 3 will be described with reference to FIGS. 5 and 7.
When the telescopic strut 30 is extended in a state where the first movable strut P1, the second movable strut P2, and the third movable strut P3 are housed in the fixed strut P0 (see FIG. 7A), the brake The release operation and the brake operation operation are performed to raise the third movable column P3 to a desired position. At that time, at the same time as the third movable column P3 rises, the second movable column P2 connected by the wire W via the pulley K also rises at the same time.
At this time, if it is assumed that the second movable column P2 remains stationary, the third movable column P3 is raised with respect to the first movable column P1 or the second movable column P2, and the fixture 17 ′ The power cable 3 between the pulleys 38 will be loosened. However, actually, the second movable support P2 rises following the slack of the power cable 3 by a length corresponding to 1/2 of the rising height of the third movable support P3, and raises the pulley 38. The slack can be absorbed. As described above, since the third movable support P3 is continuously raised and the second movable support P2 is continuously raised, the slack of the power cable 3 can be absorbed by the pulley 38. The cable 3 does not loosen.

  After the third movable column P3 is raised to the top by the above operation (see FIG. 7B), when the telescopic column 30 is further extended, the brake release operation and the brake operation operation are performed. The first movable column P1 is raised to a desired position, but the projecting heights of the second movable column P2 and the third movable column P3 with respect to the first movable column P1 do not change. The length of the power cable 3 that accompanies the extension of the first movable column P1 is adjusted only by the power cable length adjusting portion (see FIG. 7C). ).

Further, when retracting the telescopic strut 30 from the state, the brake release operation and the brake operation operation are performed to lower the first movable strut P1 to a desired position. Since the projecting heights of the two movable struts P2 and the third movable strut P3 do not change, the power cable 3 does not loosen inside the first connecting pipe C1, and the length of the power cable 3 due to degeneration is adjusted. This is performed only by the length adjusting unit.
When the telescopic strut 30 is further retracted after the first movable strut P1 is stored in the fixed strut P0 by the above operation, the brake release operation and the brake operation operation are performed to bring the third movable strut P3 to a desired position. Lower. At this time, if it is assumed that the second movable column P2 remains stationary, the third movable column P3 descends with respect to the first movable column P1 or the second movable column P2, and the fixture 17 ′ The power cable 3 between the pulleys 38 will be insufficient. However, actually, the second movable support P2 descends following the shortage of the power cable 3 by a length corresponding to ½ of the descending height of the third movable support P3, and the pulley 38 is lowered. And you can adjust the deficiency.

  In this way, even when a series of operations for extending and retracting the telescopic support column 30 is performed, the power cable 3 is fixed and wired inside the first connecting pipe C1 and the second connecting pipe, and the power cable 3 Since the wiring is carried out via the pulley 38 for appropriately changing the amount of movement outside the pipe, the power cable 3 is held in a straight line without changing its shape inside each of the connecting pipes C1 and C2. Therefore, the adjustment of the length of the power cable 3 accompanying expansion and contraction is performed only by the power cable length adjusting unit. That is, the amount of movement of the power cable 3 between the fixture 17 ′ and the pulley 38 accompanying the raising and lowering of the third movable column P3 can be adjusted by the movement of the pulley 38 accompanying the raising and lowering of the second movable column P2. The power supply cable 3 is not slackened in the middle, so that the power supply cable 3 can be prevented from being damaged and the appearance problem such as poor appearance can be solved.

  In the telescopic support 30 of the first reference example, the number of movable support units can be arbitrarily determined.

[Second Reference Example]
As shown in FIG. 8, in the second reference example according to the embodiment of the present invention, the telescopic strut 40 formed from the fixed strut P0 and the two movable struts P1 and P2 will be described as an example. The telescopic column 40 includes a fixed column P0, a first movable column P1 fitted in the fixed column P0, and a second movable column P2 fitted in the first movable column P1.

  A coil spring (not shown) for applying an upward biasing force to the first movable column P1 is provided in the hollow part of the fixed column P0, and a second movable column P2 is provided in the hollow part of the first movable column P1. Each is provided with a coil spring (not shown) for applying an upward biasing force.

  A rectangular lower upper frame 33 is fixed to the upper end portion of the first movable column P1. Further, a rectangular lower lower frame 34 having a dimension surrounding the outer diameters of the fixed column P0 and the first connecting pipe C1 is provided on the wall surface of the fixed column P0 so as to be slidable. The outer wall surface of the lower upper frame 33 and the inner wall surface of the lower lower frame 34 have such a length that the lower lower frame 34 is positioned in the vicinity of the upper end portion of the fixed column P0 when the first movable column P1 is extended to the maximum. They are connected by the first connecting pipe C1. The first connecting pipe C1 is provided so as to be substantially parallel to the outer wall surface of the first movable column P1.

  Similarly, a rectangular upper upper frame 35 is fixed to the upper end of the second movable column P2. In addition, on the upper side of the lower lower frame 34, a rectangular upper lower frame 36 having a size surrounding the outer diameters of the fixed column P0 and the second connecting pipe C2 is slidably provided on the wall surface of the fixed column P0. Yes. The outer wall surface of the upper upper frame 35 and the inner wall surface of the upper lower frame 36 have a length that allows the upper lower frame 36 to overlap the lower upper frame 33 when the second movable column P2 is raised to the maximum. Connected with C2. The second connecting pipe C2 is provided so as to be substantially parallel to the outer wall surfaces of the first movable column P1 and the second movable column P2.

  Further, a long plate connecting member 51 is fixed to the upper upper frame 35 of the second movable column P2. The connecting member 51 includes a pulley 52 (linear guide wheel) for stacking two connecting plates each having a long hole 51a formed in the entire lengthwise direction and spanning the power cable 3 in a sandwich shape between the connecting plates. ). The pulley 52 is supported by a coil spring 50 attached to the second movable column P2 and imparting an upward biasing force. The pivot shaft 52a is supported in the elongated hole 51a. The pulley 52 is accommodated in the elongated hole 51a. It is free to move along.

  The power cable 3 that connects the illuminating lamp 8 on the upper part of the second movable column P2 and the generator 7 on the pedestal 6 is connected to the generator 7 side from the end of the second connecting pipe C2 on the side of the fixed part with the upper upper frame 35. Is connected to the inside of the second connecting pipe C2 toward the end of the second connecting pipe C2, and is fixed to the upper lower frame 36 by a fixing tool 17 'in the vicinity of the outlet. Then, after passing through the upper pulley 52, the first connecting pipe C1 is wired inside the first connecting pipe C1 from the end of the first connecting pipe C1 to the lower upper frame 33 toward the end on the generator 7 side. In addition to being fixed to the lower lower frame 34 by the fixture 17 in the vicinity of the outlet portion, it is further fixed to the middle portion of the support member 9 (see FIG. 1) by the fixture 18.

Next, with reference to FIGS. 8 and 9, the operation of the telescopic support column 40 and the power cable 3 will be described.
When the telescopic strut 40 is extended in a state where the first movable strut P1 and the second movable strut P2 are housed inside the fixed strut P0 (see FIG. 9A), the brake release operation and the brake operation are performed. Operation is performed and the 2nd movable support | pillar P2 is raised to a desired position.
At this time, the pulley 52 is located at the uppermost part of the long hole 51a. However, if it is assumed that the position does not change, the pulley 52 is fixed by the second movable column P2 rising relative to the first movable column P1. The power cable 3 between the tool 17 'and the pulley 52 will be insufficient. However, in actuality, the pulley 52 descends following the shortage of the power cable 3 by a length corresponding to ½ of the rising height of the second movable column P2 by the action of the coil spring 50. The shortage can be adjusted. In this way, the deficit of the power cable 3 can be adjusted by the action of the pulley 52 by continuously repeating the raising of the second movable support P2 and the accompanying descending of the pulley 52.

  After the second movable column P2 is raised to the top by the above operation (see FIG. 9B), when the telescopic column 40 is further extended, the brake release operation and the brake operation operation are performed. The first movable strut P1 is raised to a desired position, but since the protruding height of the second movable strut P2 with respect to the first movable strut P1 does not change, the power cable 3 is connected to the inside of the first connecting pipe C1. The length of the power cable 3 that accompanies the extension is adjusted only by the power cable length adjusting section (see FIG. 9C).

Further, when retracting the telescopic support column 40 from the above state, the brake release operation and the brake operation operation are performed to lower the first movable column P1 to a desired position. 2 Since the protruding height of the movable support P2 does not change, the power cable 3 does not sag inside the first connecting pipe C1, and the length of the power cable 3 due to degeneration can be adjusted only by the power cable length adjusting section. Will be done.
When the telescopic strut 40 is further retracted after the first movable strut P1 is stored in the fixed strut P0 by the above operation, the brake release operation and the brake operation operation are performed, and the second movable strut P2 is brought to a desired position. Lower. At this time, the pulley 52 is located at the lowermost portion of the long hole 51a. However, if it is assumed that the pulley 52 remains stationary, the second movable column P2 is lowered with respect to the first movable column P1. As a result, the power cable 3 between the fixture 17 ′ and the pulley 52 is loosened. However, in actuality, the pulley 52 rises following the slack of the power cable 3 by a length corresponding to ½ of the descending height of the second movable column P2 by the action of the coil spring 50. Can absorb the slack.
Therefore, it is possible to prevent the power cable 3 from being loosened in the middle part also by the telescopic support 40 of the second reference example.

  In addition, in each telescopic strut 40 of the second reference example, the number of movable struts can be arbitrarily determined. Further, the attachment mode of the pulley 52 may be configured to be movable in conjunction with the expansion / contraction operation of the telescopic support column 40.

  The preferred embodiments and reference examples of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and can be appropriately changed in design without departing from the spirit of the present invention. Needless to say, the stretchable body can be used in addition to the stretchable support column in the projector. The means for raising and lowering each movable support may be a known means using a winch or the like for raising and lowering without using a coil spring and the brake mechanism.

It is a side view which shows a light projector. It is a perspective view which shows the expansion-contraction support | pillar of 1st Embodiment. It is a perspective view which shows the expansion-contraction support | pillar of 2nd Embodiment. It is a sectional side view which shows the expansion-contraction support | pillar of 2nd Embodiment. It is a perspective view which shows the expansion-contraction support | pillar of a 1st reference example. It is side sectional drawing which shows the expansion-contraction support | pillar of a 1st reference example. (A)-(b) is a side view which shows the effect | action of the expansion-contraction support | pillar of a 1st reference example. It is a perspective view which shows the expansion-contraction support | pillar of the 2nd reference example. (A)-(b) is a side view which shows the effect | action of the expansion-contraction support | pillar of a 2nd reference example. It is a side view which shows the conventional expansion-contraction support | pillar.

Explanation of symbols

T projector 1, 10, 20, 30, 40 telescopic support 3 power cable 6 pedestal 7 generator 8 illuminator P0 fixed support P1 first movable support (movable tube, first movable tube)
P2 Second movable strut (second movable tube)
P3 Third movable strut (third movable tube)
U1 Movable strut unit (movable tube unit)
11, 11 ′ coil spring 13 upper frame 14 lower frame C1 first connecting pipe (movement guide member)
C2 Second connecting pipe (movement guide member)
33 Lower upper frame 34 Lower lower frame 35 Upper upper frame 36 Upper lower frame 38, 52 Pulley (Linear guide car)
50 Coil spring 51 Connecting member 51a Slot

Claims (2)

A hollow fixed tube,
A movable tube fitted into the fixed tube so as to be able to appear and retract,
A movement guide member composed of a long tubular member or a groove-shaped member, the upper part of which is fixed to the movable tube, and is provided so as to be movable along the longitudinal direction of the wall surface of the fixed tube;
A flexible linear body that is wired along the movement guide member in the tube or in the groove and is fixed from the tip of the movable tube to a predetermined position of the fixed tube. There,
A lower frame provided on the wall surface of the fixed tube so as to be slidable along its longitudinal direction;
A brake mechanism that is internally mounted in the lower frame and presses the wall surface of the fixed tube to restrict sliding of the lower frame,
A telescopic body, wherein a lower portion of the movement guide member is connected to the lower frame. A hollow fixed tube,
A hollow first movable tube fitted in the fixed tube so as to be freely movable,
A hollow second movable tube that is fitted in the first movable tube so as to freely appear and retract,
The upper part is fixed to the second movable tube, and is composed of a long tubular member or a groove-shaped member that is provided so as to be movable along the longitudinal direction of the wall surface of the fixed tube and the wall surface of the first movable tube. A movement guide member;
A flexible linear body that is wired in the tube or groove along the movement guide member and is fixed from the tip of the second movable tube to a predetermined position of the fixed tube. Body,
A lower frame provided on the wall surface of the fixed tube so as to be slidable along its longitudinal direction;
A brake mechanism that is internally mounted in the lower frame and presses the wall surface of the fixed tube to restrict sliding of the lower frame,
A telescopic body, wherein a lower portion of the movement guide member is connected to the lower frame.

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