JP2012121074A - Multistage expansion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact multistage expansion device which reduces a difference in external dimension between stages, increases design flexibility of a device cylindrical body, increases stiffness of the device, and improves assemblability and maintainability of components in the device.SOLUTION: The multistage expansion device comprises an outermost stage cylindrical body, an intermediate stage cylindrical body, and an innermost cylindrical body. The cylindrical bodies can be protruded successively from the inside of the outermost stage cylindrical body. In the multistage expansion device, a pulley around which a wire for pulling the intermediate cylindrical body is wound and which is movable integrally with the intermediate cylindrical body is disposed in the innermost stage cylindrical body.

Description

      The present invention relates to a multistage expansion / contraction device that moves a moving body such as a stage photographing camera, a medical X-ray irradiation apparatus, or an industrial robot.

      FIG. 5 shows an example of a conventional multistage expansion / contraction apparatus configured in a four-stage system. In this multistage expansion / contraction device, four cylindrical bodies each having a rectangular cross section with different diameters are loosely fitted on the same axis, and each cylindrical body can be projected and retracted downward from one outer cylindrical body. It is a thing. The four cylindrical bodies are, in order from the outside, a first-stage cylindrical body 1a as an outermost-stage cylindrical body, a second-stage cylindrical body 1b and a third-stage cylindrical body 1c as intermediate-stage cylindrical bodies, It is comprised by the 4th step cylinder 1d as an innermost step cylinder. The first-stage cylindrical body 1a is fixed to the ceiling 30, and the remaining second-stage cylindrical body 1b, third-stage cylindrical body 1c, and fourth-stage cylindrical body 1d are movable in the vertical direction. Each one is configured to be able to appear and disappear from the outer cylindrical body.

      A pulley 10 is provided on the lower inner surface of the second-stage cylindrical body 1b. A wire 11 is wound around the pulley 10. One end of the wire 11 is fixed to the upper end of the third-stage cylindrical body 1 c and the other end is the first-stage cylindrical body 1 a or the ceiling. It is fixed to 30. A pulley 12 is provided on the lower inner surface of the third-stage cylindrical body 1c. A wire 13 is wound around the pulley 12, and one end of the wire 13 is fixed to the upper end of the fourth-stage cylindrical body 1d, and the other end is the upper end of the second-stage cylindrical body 1b. It is fixed to the part.

      On the other hand, one end of the winch wire 14 is fixed to the upper end of the fourth-stage cylindrical body 1d. The other end of the winch wire 14 is moved up and down by moving the winch wire 14 up or down by a winch (not shown). A guide member 8 including a rail 8a and a bearing 8b is provided in each gap between the first-stage cylindrical body 1a and the fourth-stage cylindrical body 1d.

      Next, the operation of the multistage telescopic device configured as described above will be described. From the extended state shown in FIG. 5, when the winch is driven to wind up the wire 14 and move the fourth-stage cylindrical body 1d upward, the third-stage cylindrical body 1d moves along with the third-stage cylindrical body 1d. The cylindrical body 1c and the second-stage cylindrical body 1b also move upward. At this time, the moving distance of the fourth-stage cylindrical body 1d relative to the third-stage cylindrical body 1c is equal to the moving distance of the third-stage cylindrical body 1c relative to the second-stage cylindrical body 1b, and the second-stage cylindrical body The moving distance of the third-stage cylindrical body 1c relative to the body 1b is equal to the moving distance of the second-stage cylindrical body 1b relative to the first-stage cylindrical body 1a. Therefore, the ratio of the moving distance of each cylindrical body to the first-stage cylindrical body 1a is the fourth-stage cylindrical body 1d: the third-stage cylindrical body 1c: the second-stage cylindrical body 1b = 3: 2: 1. Become. As described above, the second-stage cylindrical body 1b, the third-stage cylindrical body 1c, and the fourth-stage cylindrical body 1d move upward in the above-described ratio, so that the entire multistage expansion / contraction apparatus performs a contraction operation. .

Conversely, when the multi-stage telescopic device is extended as a whole, if the winch is driven and the wire 14 fixed to the fourth-stage cylindrical body 1d is fed out, the fourth-stage cylindrical body 1d is moved downward by its own weight. As the fourth-stage cylindrical body 1d moves, the third-stage cylindrical body 1c and the second-stage cylindrical body 1b also move downward. At this time, the ratio of the moving distance of the fourth-stage cylindrical body 1d, the third-stage cylindrical body 1c, and the second-stage cylindrical body 1b is the same as that during contraction. (For example, see Patent Document 1)

JP 63-269497 A

      However, the conventional multistage expansion device has several problems. The problem with the device shown in Patent Document 1 is that pulleys and wires must be provided in the gaps between the fitted cylindrical bodies, and the difference in the external dimensions of each stepped cylindrical body inevitably increases. It was an obstacle to downsizing the device. This is because the outer dimensions of the lowermost cylindrical body cannot be made very small due to problems of torsional rigidity and strength. Therefore, as the number of stages increases, the outer dimension difference of each stage increases. This is due to increased external dimensions.

      In addition, since a pulley or the like is disposed in the clearance of the cylindrical body, the pulley and the wire cannot be taken out as a subunit, and maintenance and inspection are difficult.

      Also, if the horizontal cross-sectional shape of the cylindrical body is circular, the pulley outer periphery including the wire must be prevented from interfering with the adjacent cylindrical body, and a clearance larger than the pulley thickness is required at the pulley central portion. Therefore, considering the space efficiency, the horizontal cross-sectional shape of the cylindrical body is restricted to a polygon having a straight portion instead of a circle, and design freedom is limited.

      Furthermore, since a pulley, a wire, and the like are disposed between the cylindrical bodies, annular sliding members are provided on the lower inner side of the overlapping outer cylindrical body and the upper outer side of the inner cylindrical body, respectively. It was difficult to slide the cylindrical bodies together to reduce play in the horizontal direction and increase rigidity.

      Therefore, in the present invention, without increasing the difference in the outer dimensions of each step of the cylindrical body, and thus without increasing the radial dimension of the apparatus, each step cylindrical body is positioned in a coordinated manner, and the cylindrical body rapidly It aims at providing the multistage expansion-contraction apparatus which does not produce the danger which falls. Also, to provide a multi-stage expansion / contraction device that facilitates assembly and maintenance / inspection by allowing a mechanism for cooperatively extending / contracting each step-shaped tubular body to be taken out as a separate subunit from the tubular body unit. With the goal.

Moreover, it aims at providing the multistage expansion-contraction apparatus with the design freedom which can make a cylindrical body cross-sectional shape into a substantially circular shape, without increasing the clearance gap between cylindrical bodies unnecessarily. Furthermore, the cylindrical bodies are slidably fitted to each other between the lower inner side of the overlapping outer cylindrical body and the upper outer side of the inner cylindrical body with an annular sliding member interposed therebetween, or the rigidity is increased. An object of the present invention is to provide a multistage expansion / contraction device capable of simplifying the vertical sliding contact structure.

      In order to achieve the above object, the present invention is configured as follows. The invention described in claim 1 includes an outermost cylindrical body, an intermediate-stage cylindrical body, and an innermost-stage cylindrical body, and the next-stage cylindrical body can be projected and retracted sequentially from the outermost-stage cylindrical body. In the multi-stage telescopic device, a wire that pulls the intermediate-stage cylindrical body is wound, and a pulley that is movable integrally with the intermediate-stage cylindrical body is disposed inside the innermost-stage cylindrical body. Is a multistage telescopic device characterized by

      The invention according to claim 2 includes an outermost cylindrical body, an intermediate-stage cylindrical body, and an innermost-stage cylindrical body, and the next-stage cylindrical body can be projected and retracted sequentially from the outermost-stage cylindrical body. In the multistage telescopic device, a pulley around which a wire for pulling the intermediate stage tubular body is wound is disposed at the tip of a rod-like member suspended from the upper end of the intermediate stage cylindrical body. The multi-stage telescopic device according to claim 1, wherein the pulley is configured to move integrally.

      The invention according to claim 3 is composed of an outermost cylindrical body, an intermediate cylindrical body, and an innermost cylindrical body, and the next-stage cylindrical body can be projected and retracted sequentially from the outermost cylindrical body. In the multistage expansion / contraction device made, a pulley around which a wire for pulling the intermediate stage cylindrical body is wound is disposed at the tip of a rod-like member hanging from the upper end of the intermediate stage cylindrical body, and the intermediate stage cylindrical body And the pulley are configured to move as one body, and one end of the wire is fixed to the outer cylindrical body side of the intermediate-stage cylindrical body, and the other end is connected to the intermediate-stage cylindrical body. The multistage expansion and contraction device according to claim 1 or 2, wherein the multistage expansion and contraction device is fixed to an inner cylindrical body side.

According to a fourth aspect of the present invention, when the position detecting member is inserted in the vicinity of one end of the cylindrical body except the innermost stage, and the apparatus is contracted to the maximum contraction or a predetermined set position, the previous position detection member The multistage expansion / contraction apparatus according to claim 1, further comprising a contraction position detection mechanism that utilizes a movement of the innermost step part in contact with the innermost step part.

      As described above, the multistage expansion and contraction device of the present invention does not arrange a pulley or a wire in the gap between the multiple-fitted cylindrical bodies, and all the pulleys and wires are placed in the lowermost cylindrical body and its extension region. Because of the arrangement, the difference in the outer dimensions of each stage of the cylindrical body can be reduced, and as a result, the intermediate stage cylindrical body can be positioned without increasing the radial dimension of the multistage expansion device, and any stage of the cylindrical body can be abruptly It is possible to prevent the danger of falling.

      Also, without completely separating each stepped cylindrical body, the upper end of the second and subsequent stages is exposed from the uppermost end of the uppermost stage, and the cap member of each stage together with the rod-shaped body, pulley, wire, If separated from each cylindrical body, even if there are two or more sets of cap members, rod-shaped bodies, pulleys, and wires, they can be removed from the main body of the multistage expansion and contraction device or assembled in reverse. In addition, the assembly workability and maintenance checkability around the wire can be improved.

      Moreover, the multistage expansion-contraction apparatus which made the cylindrical body cross-sectional shape substantially circular shape can also be provided, without increasing the clearance gap between cylindrical bodies unnecessarily.

      Further, an annular sliding member is sandwiched between the overlapping cylindrical bodies, and the cylindrical bodies are slidably fitted to each other via the sliding member to reduce horizontal play, increase rigidity, or The vertical sliding structure of the cylindrical body can be simplified.

Further, it is possible to detect that the apparatus is contracted to the maximum or contracted to a predetermined setting position without projecting a protrusion on the side surface of the apparatus.

It is a front view which shows the external appearance of 1 Example which applied the multistage expansion-contraction apparatus of this invention to the ceiling-suspended 4-stage expansion-contraction type mobile body positioning apparatus. It is front sectional drawing which shows the internal structure of the cylindrical body multistage expansion-contraction part of the Example. It is a perspective view which shows the internal structure of the Example. It is sectional drawing showing the contraction position detection part of the cylindrical body multistage expansion-contraction part of the Example. It is a fragmentary detailed sectional view showing a position detection part when a cylindrical body multistage expansion-contraction part contracts most of the Example. It is front sectional drawing which shows the inside of the conventional ceiling suspension type multistage expansion-contraction apparatus.

      Hereinafter, an example in which the multistage expansion / contraction apparatus of the present invention is applied to a ceiling-suspended four-stage expansion / contraction apparatus for positioning a photographing camera will be described with reference to FIGS. FIG. 1 is a front view showing the whole of an embodiment of an apparatus for positioning a ceiling-suspended four-stage telescopic camera. In the present embodiment, a first-stage tubular body 21 as an outermost tubular body of a multistage telescopic device is attached to a mounting base member 1 that is integrally formed on a ceiling or a carriage that moves on a rail fixed to the ceiling. Are assembled in the vertical direction. From the inside of the lower end of the first-stage cylindrical body 21, the second-stage cylindrical body 31 and the third-stage cylindrical body 41 as intermediate-stage cylindrical bodies, and the fourth-stage cylindrical body as the innermost-stage cylindrical body. 51 enters and exits, and the photographing camera 9 attached to the lower end of the fourth-stage cylindrical body 51 is moved up and down. A winch 2 that is driven by a motor 4, a gear box 3, or the like is provided on an upper portion of the first-stage cylindrical body 21, and one end of a winch wire 6 wound around the winch 2 is provided in the multistage telescopic device. It is fixed to the lower part of the fourth-stage cylindrical body through the inside.

      FIG. 2 is a sectional view showing the internal mechanism of the present invention, wherein the mounting base member 1, the winch 2, the gear box 3, the motor 4 and the photographing camera 9 are removed from the overall view of FIG. A second-stage cylindrical body 31 is fitted inside the first-stage cylindrical body 21, and similarly, a third-stage cylindrical body 41 is installed inside the second-stage cylindrical body 31. A fourth-stage tubular body 51 is fitted inside the shaped body 41 and can slide in the vertical direction. Moreover, although the cross-sectional shape of each step cylindrical body 21, 31, 41, 51 of this embodiment is substantially circular, a rotation stopper (not shown) is provided for restricting rotation around the vertical axis.

      A second-stage cap member 32 is assembled to the upper end portion of the second-stage cylindrical body 31, and a second-stage rod-shaped member 33 hangs from the second-stage cap member 32. A second-stage pulley 34 and a second-stage wire drop-off preventing member 35 are attached to the lower end of the second-stage rod-shaped member 33. A wire (not shown) is wound around the second-stage pulley 34, and one end of the wire passes through the through holes of the second-stage, third-stage, and fourth-stage cap members. The winch base plate 2 a at the top of the cylindrical body is fixed to the winch base plate 2 a, and the other end is fixed to the third-stage cap member 42 through the through hole of the fourth-stage cap member 52.

      Similarly, a third-stage cap member 42 is assembled to the upper end portion of the third-stage cylindrical body 41, and a third-stage rod-shaped member 43 is suspended from the third-stage cap member 42. A third-stage pulley 44 and a third-stage wire drop-off preventing member 45 are attached to the lower end portion of the third-stage rod-shaped member 43. A wire (not shown) is wound around the third-stage pulley 44, and one end of the wire passes through the third-stage and fourth-stage cap member through-holes and stops on the second-stage cap member 32. While being worn, the other end is fastened to the fourth-stage cap member 52.

      The winch wire 6 drawn downward from the winch 2 provided at the upper part of the first-stage cylindrical body 21 is a long hole provided at the center of each of the second-stage, third-stage, and fourth-stage cap members. And is fixed to a fourth-stage base cap member 53 assembled to the lower part of the fourth-stage cylindrical body.

      FIG. 3 is a cross-sectional view showing the internal mechanism of the present invention, and is a perspective view in which the cylindrical bodies 21, 31, 41, 51 at each step are removed from the cross-sectional view of FIG. The third-stage wire 46 path will be described in more detail with reference to this figure. A third-stage cap member 42 is assembled to the upper end portion of the third-stage cylindrical body 41, and a third-stage rod-shaped member 43 is suspended from the third-stage cap member 42.

      A third-stage wire 46 is wound around a third-stage pulley 44 attached to the lower end of the third-stage rod-shaped member 43, and one end of the wire is provided on the fourth-stage cap member 52. Passing through the step wire through hole 52c and the third step wire through hole 42a provided in the third step cap member 42, it is fixed to the three step wire fixing portion 32a provided in the second step cap member 32. The other end of the step wire 46 is fixed to the third step wire fixing portion 52a of the fourth step cap member. A similar mechanism is also applied to the second-stage wire 36 wound around the second-stage pulley 34 attached to the lower end of the second-stage bar-shaped member 33. Note that one end of the second-stage wire 36 is fixed to a winch base plate 2a serving as a substitute for the upper end of the first-stage cylindrical body.

      FIG. 4a is a cross-sectional view illustrating a position detection member 37 for detecting that the multistage contraction device of the present invention is most contracted or in a predetermined position. This cross-sectional view is a cross-section taken along a plane passing through the center of the position detection member 37, and is a cross-section different from FIG. In FIG. 4a, the second-stage cap member 32 is provided with a position detection member sliding contact hole 32e for sliding contact with the position detection member 37, and is slidably contacted with the sliding contact hole 32e so as to be movable a finite distance in the vertical direction. A position detection member 37 is assembled. The movement distance limitation of the position detection member 37 prevents the position detection member 37 from falling off the cap member 32, and the position detection member through escape hole of the cap member 42 is provided at the lower end side of the position detection member 37. 42a is provided. Further, below the position detection member through escape hole 42a, the upper end portion of the fourth-stage cylindrical body 51 or a part of the fourth-stage cap member 52 is on the lower end extension of the position detection member 37, and the position detection member A contact portion 52e is formed.

      Next, the operation of the present invention will be described. In FIG. 2, the first-stage cylindrical body 21 is fixed to an attachment base member (not shown). The fourth-stage cylindrical body 51 is suspended by a winch wire 6 that is drawn downward from a winch (not shown) provided at the upper part of the first-stage cylindrical body. By driving the winch using a motor or a gear box, the lower end position of the winch wire 6 moves up and down, that is, the position of the fourth-stage cylindrical body 51 can be controlled.

      When the winch is driven to wind up the winch wire 6 and move the fourth-stage tubular body 51 upward from the extended state shown in FIG. 2, the third-stage cylinder is moved along with the movement of the fourth-stage tubular body 51. The cylindrical body 41 and the second-stage cylindrical body 31 also move upward. At this time, the moving distance of the fourth-stage tubular body 51 with respect to the third-stage tubular body 41 is equal to the moving distance of the third-stage tubular body 41 with respect to the second-stage tubular body 31 and the second-stage tubular body. The moving distance of the third-stage cylindrical body 41 relative to the body 31 is equal to the moving distance of the second-stage cylindrical body 31 relative to the first-stage cylindrical body 21. Therefore, the ratio of the moving distance of each cylindrical body to the first-stage cylindrical body 21 is the fourth-stage cylindrical body 51: the third-stage cylindrical body 41: the second-stage cylindrical body 31 = 3: 2: 1. Become. As described above, the second-stage cylindrical body 31, the third-stage cylindrical body 41, and the fourth-stage cylindrical body 51 move upward in the above-described ratio, so that the contraction operation is performed as the entire multistage expansion device. .

      On the other hand, when the multistage expansion / contraction device is extended as a whole, if the winch is driven and the winch wire 6 fastened to the fourth-stage cylindrical body 51 is fed out, the fourth-stage cylindrical body 51 is caused by its own weight. As the fourth-stage tubular body 51 moves, the third-stage tubular body 41 and the second-stage tubular body 31 also move downward. At this time, the ratio of the moving distance of the fourth-stage cylindrical body 51, the third-stage cylindrical body 41, and the second-stage cylindrical body 31 is the same as that during contraction.

      By these actions, the expansion / contraction position of each cylindrical body is determined in a well-balanced manner, so that the position of the specific cylindrical body becomes indeterminate and there is no fear of dropping.

      Further, as shown in FIG. 2, the expansion and contraction of the intermediate-stage cylindrical bodies 31 and 41 other than the fourth-stage cylindrical body 51 whose position is determined by the first-stage cylindrical body 21 and the winch wire 6 on the fixed side. The pulleys 34, 44 for controlling the position, the wires wound around the pulleys 34, 44, and the rod-like bodies 33, 43 holding the pulleys 34, 44 are all four-stages which are the innermost cylindrical bodies. Since it is disposed in the inside of the cylindrical body 51 or in the moving region thereof, it is not necessary to dispose a pulley or a wire in the clearance of each stepped cylindrical body. Therefore, the clearance of each step cylindrical body can be reduced, that is, the external dimension difference of each step cylindrical body can be reduced.

      Alternatively, since there is no need to provide a pulley in the gap of each stepped cylindrical body, there may be no straight portion in the gap of each stepped cylindrical body. Alternatively, it is not necessary to secure a clearance area that can accommodate the pulley diameter. Therefore, the design freedom degree which makes the cross-sectional shape of each step cylindrical body substantially circular shape is obtained.

      Furthermore, if the cross-sectional shape of each stepped cylindrical body is substantially circular, an annular formed with a sliding material amount such as resin without using a special rail or rolling bearing as a sliding guide between the cylindrical bodies If the sliding members 7a and 7b are sandwiched between the cylindrical bodies, a simple and simple sliding mechanism can be configured. Further, if the annular sliding member is constituted by a sliding bearing, the mounting area can be increased as compared with a sliding mechanism using a ball bearing, so that an improvement in rigidity against a lateral load can be expected.

      Further, in the multistage expansion device of FIG. 2, one pulley and wires can be integrally taken out from the expansion device main body by the following procedure. That is, first, one end of the wire wound around the second-stage pulley fixed to the mounting base member 1 is removed to obtain the state shown in FIG. Next, when the upper part of the second-stage cylindrical body is pulled out from the upper part of the first-stage cylindrical body, the second-stage cap member 32 can be separated from the second-stage cylindrical body 31. Further, when the upper part of the third-stage tubular body 41 is pulled out from the upper part of the second-stage tubular body 31, the third-stage cap member 42 can be separated from the third-stage tubular body 41. Further, when the upper part of the fourth-stage tubular body 51 is pulled out from the upper part of the third-stage tubular body 41, the fourth-stage cap member 52 can be separated from the fourth-stage tubular body 51. With the above procedure, the sub-assembled parts including the cap members 32, 42, 52, the rod-like members 33, 43, the pulleys 34, 44, and the wires 36, 46 at each step as shown in FIG. Can be taken out from.

      As the operation of the pulleys and wires can be checked and inspected in the state of the sub assembly shown in FIG. 3, compared to the conventional multistage expansion and contraction device individually provided inside the clearance and inside of each stepped cylindrical body, Workability at the time of assembly confirmation and maintenance inspection can be improved.

      Furthermore, in this embodiment, as shown in FIG. 4 a, the position detection member 37 is inserted into the position detection member sliding contact hole 32 e of the second-stage cap member 32. When the multistage telescopic device is in the most contracted state, the second-stage cap member 32, the third-stage cap member 42, and the fourth-stage cap member 52 approach or come into contact with each other. Through the hole 42a, it comes into contact with the position detection part 52e at the upper part of the fourth-stage cylindrical body and is pushed upward. As a result, as shown in FIG. 4b, the position detection member 37 inserted through the second-stage cap member 32 is lifted by the movement amount L shown in FIG. By detecting the movement amount L of the position detection member 37 from the winch base member 2a at the upper part of the cylindrical body 21 with an optical sensor, a proximity sensor, a micro switch, etc., the multistage expansion / contraction device is contracted to the minimum or predetermined It is possible to detect contraction to the contraction position. The position detection mechanism shown in FIGS. 4a and 4b occupies only the area inside the apparatus and the upper part of the first-stage cylindrical body 21, including a sensor unit (not shown). In other words, since no protrusions, sensors, or wiring cords are exposed on the side of the device, the appearance of the device is not impaired, and there is no protrusion at a position that can be touched by a normal user. Is.

      In the present invention, the means for positioning the cylindrical body that is not directly driven from the outside has been described as a pulley around which a wire is wound. A guide pin or a guide groove for making a U-turn by sliding a chain and a sprocket, a belt and a pulley, a string and a string may be used.

      In the present embodiment, a winch 2 that can be rotated by using the motor 4, the gear box 3, or the like is provided on the upper portion of the first-stage cylindrical body 21, and the winch wire wound around the winch 2 is provided. Although one end of 6 is fixed to the lower part of the fourth-stage cylindrical body through the inside of the multistage telescopic device, the position of the winch 2 may be switched upside down. That is, a winch 2 that can be rotated using a motor, a gear box, or the like is provided at the lower portion of the fourth-stage cylindrical body 51, and one end of the winch wire 6 wound around the winch 2 is It may be fixed to the upper side of the first-stage cylindrical body through the inside of the multistage expansion / contraction device.

      Furthermore, in the present embodiment, in the suspended four-stage expansion / contraction device, it has been described that the driving force from the outside is transmitted to the lowermost cylindrical body 51 by the winch 2 and the winch wire 6, but means for transmitting the driving force from the outside is described. A combination of an energy source such as a spring and a weight and a transmission means such as a pulley and a wire, a sprocket and a chain, and a pulley and a belt may be used. Alternatively, an electric feed screw or a hydraulic / pneumatic cylinder in which the energy source and the transmission means are integrated may be used.

      The example in which the multistage expansion and contraction device of the present invention is applied to a positioning device for a photographing camera has been described above, but the present invention can be widely applied to a device intended for wide positioning. For example, when applied to a medical X-ray imaging apparatus or a manipulator, the positioning object can be brought closer to the central axis of the multistage telescopic device by reducing the external dimensions of the multistage telescopic device. Effective use of space becomes possible. Alternatively, if the present invention is applied to an inner diameter processing or inner diameter inspection apparatus for an elongate long pipe, a pipe having a smaller inner diameter can be processed or inspected.

      Furthermore, if the multistage telescopic device of the present invention is applied to a stage device photographing camera or a sound collecting microphone positioning device, the cross-sectional shape of the cylindrical body that can be multistagely expanded and contracted can be made substantially circular, thereby improving the design as stage equipment. I can expect.

In other words, the present invention reduces various dimensional differences between the stepped cylindrical bodies and the maximum external dimension of the apparatus, and on the other hand, increases the degree of freedom of design of the cross section of the cylindrical body, thereby improving various usability. It can be applied to a telescopic device.

DESCRIPTION OF SYMBOLS 1 Mounting base member 1a Prior art 1st stage cylindrical body 1b Prior art 2nd stage cylindrical body 1c Prior art 3rd stage cylindrical body 1d Prior art 4th stage cylindrical body 2 Winch 2a Winch base member 3 gear box 4 motor 6 winch wire 7 annular sliding member 8 prior art guide member 8a prior art rail 8b prior art bearing 9 photographing camera 10 prior art second stage pulley 11 prior art second stage wire 12 conventional Technical third-stage pulley 13 Conventional third-stage wire 14 Conventional technology winch wire 21 First-stage cylindrical body 30 Conventional technology ceiling 31 Second-stage cylindrical body 32 Second-stage cap member 32a Three-stage wire stopper Placement portion 32c Second-stage wire through hole 32d Winch wire through-hole 32e Position detection member sliding contact hole 33 Second-stage rod-shaped member 34 Second-stage pulley 35 Second-stage wire drop prevention member 36 Stage wire 37 Position detection member 41 Third stage cylindrical body 42 Third stage cap member 42a Third stage wire through hole 42c Second stage wire through hole 42e Position detection member through escape hole 43 Third stage rod-shaped member 44 Third stage pulley 45 Third-stage wire drop-off prevention member 46 Third-stage wire 51 Fourth-stage cylindrical body 52 Fourth-stage cap member 52a Third-stage wire fixing part 52c Second-stage wire through hole 52d Winch wire through-hole 52e Position detection member contact Part 54 4th stage base cap member

Claims (4)

In a multi-stage telescopic device comprising an outermost tubular body, an intermediate-stage tubular body, and an innermost-stage tubular body, in which the next-stage tubular body can be projected and retracted sequentially from the outermost-stage tubular body. A multi-stage telescopic device, characterized in that a wire that pulls a tubular body is wound and a pulley that is movable integrally with the intermediate-stage tubular body is disposed inside the innermost tubular body.

In a multi-stage telescopic device comprising an outermost tubular body, an intermediate-stage tubular body, and an innermost-stage tubular body, in which the next-stage tubular body can be projected and retracted sequentially from the outermost-stage tubular body. A pulley around which a wire for pulling the intermediate-stage cylindrical body is wound is disposed at the tip of a rod-like member that hangs from the upper end of the cylindrical body, and the intermediate-stage cylindrical body and the pulley move together. The multistage telescopic device according to claim 1, which is configured as described above.

In a multi-stage telescopic device comprising an outermost tubular body, an intermediate-stage tubular body, and an innermost-stage tubular body, in which the next-stage tubular body can be projected and retracted sequentially from the outermost-stage tubular body. A pulley around which a wire for pulling the intermediate-stage cylindrical body is wound is disposed at the tip of a rod-like member that hangs from the upper end of the cylindrical body, and the intermediate-stage cylindrical body and the pulley move together. The one end of the wire is fastened to the cylindrical body side outside the intermediate stage cylindrical body, and the other end is fastened to the cylindrical body side inside the intermediate stage cylindrical body. The multistage expansion / contraction apparatus according to claim 1, wherein the multistage expansion / contraction apparatus is provided.

In a multi-stage telescopic device comprising an outermost tubular body, an intermediate tubular body, and an innermost tubular body, and the next tubular body can be projected and retracted sequentially from the outermost tubular body. The position detection member is inserted and held at the end of one of the cylindrical bodies excluding the stepped cylindrical body, and when the device is contracted to the minimum or the predetermined set position, the end of the previous position detection member is the innermost The multistage expansion / contraction apparatus according to any one of claims 1 to 3, further comprising a contraction position detection mechanism that utilizes the movement by contacting the end of the stepped cylindrical body.

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