Telescopic support

Abstract

To provide a telescopic columnar support which can be quickly and easily elongated and contracted while maintaining rigidity.SOLUTION: A telescopic columnar support 1 comprises: an outer cylinder 10 having a rectangular internal peripheral cross-section; and an inner cylinder 20 which is inserted into the outer cylinder 10 from above and has a rectangular external peripheral cross-section, and is telescopic by changing an insertion length of the inner cylinder 20 with respect to the outer cylinder 10. In the inner cylinder 20, a plurality of lock holes 21 are formed along a longitudinal direction, and a fixing member 30 attached to an upper part of the outer cylinder 10 is also arranged. The fixing member 30 comprises: an attachment cylinder 31 externally fit to the outer cylinder 10; a turning member 32 supported to the attachment cylinder 31 so as to be turnable; and an energization member 33 for energizing the turning member 32. The turning member 32 has an insertion part which is energized so as to be inserted into the lock holes 21 by the energization member 33, and the insertion of the insertion part into the lock holes 21 is released by a turn while withstanding an energization force of the energization member 33.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a telescoping column. [Background technology]

[0002] Patent Document 1 discloses a conventional telescopic support structure that includes multiple hollow cylindrical poles and allows the insertion length of the upper pole relative to the lower pole to be adjusted. The insertion length of the upper pole can be adjusted by selecting one of the through holes formed in multiple stages in the upper pole, aligning it with the insertion hole formed in the lower pole, and inserting a pin through the insertion hole and through hole to fix it to the desired length. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-260123 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned conventional supports are generally of an extendable configuration, but when changing the overall length, it is necessary to remove the pins from both the upper and lower poles, align the insertion holes with the through holes, and then reinsert the pins. This means that in the case of long or heavy supports, the series of steps required to adjust the extendable length is complicated and time-consuming.

[0005] Therefore, an object of the present invention is to provide a telescopic support that can be quickly and easily extended and retracted while maintaining its strength. [Means for solving the problem]

[0006] The object of the present invention is to provide an extendable support column that includes an outer tube having a rectangular inner cross section and an inner tube having a rectangular outer cross section that is inserted into the outer tube from above, and that can extend and retract by changing the insertion length of the inner tube relative to the outer tube, wherein the inner tube has a plurality of locking holes formed along the longitudinal direction and further includes a fixing member attached to an upper part of the outer tube, the fixing member including an attachment tube that is fitted onto the outer tube, a rotating member that is rotatably supported on the attachment tube, and a biasing member that biases the rotating member, the rotating member having an insertion portion that is biased by the biasing member to be inserted into the locking hole, and the insertion of the insertion portion into the locking hole is released by rotating the rotating member against the biasing force of the biasing member. The outer cylinder has a plurality of through holes formed along the longitudinal direction, the insertion portion is inserted into the locking hole through one of the through holes, and the rotating member has an arc-shaped engaging portion that maintains an engaged state with another of the through holes during rotation. This is achieved by telescoping struts.

[0007] In this telescopic support, it is preferable that the insertion portion is formed so that its width in the vertical direction narrows toward the tip, and it is preferable that when the insertion portion is inserted into the locking hole and the inner tube is pulled out from the outer tube, the edge of the locking hole pushes up the insertion portion and rotates the rotating member. [Effects of the Invention]

[0009] The telescopic support of the present invention can be quickly and easily extended and retracted while maintaining its strength. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a front view of a telescopic support column according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the telescopic support column shown in FIG. [Figure 3] 2 is a schematic cross-sectional view of a main part for explaining the operation of the telescopic support column shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a front view of a telescopic support column according to one embodiment of the present invention, and Fig. 2 is a plan view of the telescopic support column shown in Fig. 1. As shown in Figs. 1 and 2, the telescopic support column 1 includes an outer cylinder 10, an inner cylinder 20, and a fixing member 30.

[0012] The outer cylinder 10 is formed in the shape of a square tube with rectangular inner and outer cross sections. A plurality of elongated through holes 11 extending in the longitudinal direction of the outer cylinder 10 are formed on the side of the outer cylinder 10 at equal intervals along the longitudinal direction. In this embodiment, the through hole 11 is formed on only one of the four side surfaces of the outer cylinder 10, but a plurality of through holes 11 may be formed on each of two or more side surfaces of the outer cylinder 10. The lower end of the outer cylinder 10 is closed by a cap 12.

[0013] The inner tube 20 is formed in the shape of a rectangular tube with rectangular inner and outer cross sections. A plurality of slot-shaped locking holes 21 extending in the longitudinal direction of the inner tube 20 are formed on the side of the inner tube 20 at equal intervals along the longitudinal direction. The locking holes 21 are formed to be approximately the same size as the through-holes 11 of the outer tube 10, and the inner tube 20 is inserted into the outer tube 10 from above so that the locking holes 21 and the through-holes 11 face each other. In this embodiment, the locking hole 21 is formed on only one of the four side surfaces of the inner tube 20, but multiple locking holes may be formed on two or more side surfaces of the inner tube 20. The upper end of the inner tube 20 is closed by a cap 22. It is preferable to form a small gap between the inner surface of the outer tube 10 and the outer surface of the inner tube 20.

[0014] The fixing member 30 includes a mounting tube 31 fitted onto the outer tube 10, a rotating member 32 rotatably supported by the mounting tube 31, and a biasing member 33 that biases the rotating member 32. The mounting tube 31 is a square cylindrical member that is fitted onto the outer peripheral surface of the upper part of the outer tube 10, and a frame-shaped stopper 31a that protrudes inward is formed at the upper end of the mounting tube 31.

[0015] A pair of guide portions 34, 35 extending parallel to each other in the longitudinal direction of the mounting tube 31 are provided on the surface of the mounting tube 31. The rotating member 32 is formed in a plate shape and is supported by a pin 36 between the pair of guide portions 34, 35 so that it can rotate freely in the vertical direction. An insertion portion 32a is provided on the upper part of the rotating member 32, which is inserted into the through hole 11 and the locking hole 21 and protrudes into the interior of the inner tube 20. The biasing member 33 is made of, for example, a coil spring, and biases the rotating member 32 so that the insertion portion 32a is inserted into the through hole 11 and the locking hole 21.

[0016] Fig. 3 is a schematic cross-sectional view of a main part of the telescopic support column 1, and is a view corresponding to the cross section AA in Fig. 2. As shown in Fig. 3(a), the insertion section 32a formed at the upper part of the rotating member 32 has an upper flat section 32d and a lower inclined section 32e that is inclined relative to the flat section 32d, and is formed in a triangular shape so that its vertical width narrows toward the tip side (the right side of the figure). The maximum vertical width of the insertion section 32a at the base end side is smaller than the vertical widths of the through-hole 11 and the locking hole 21 so that the insertion section 32a can be released from the through-hole 11 and the locking hole 21 by rotating the rotating member 32 about the pin 36.

[0017] An arc-shaped engaging portion 32b is formed in the vertical center of the rotating member 32, concentric with the pin 36 that bulges in the same direction as the insertion portion 32a. The engaging portion 32b is partially inserted into another through-hole 11 adjacent below the one through-hole 11 into which the insertion portion 32a is inserted, and engages with the other through-hole 11.

[0018] The biasing member 33 has both ends supported by protruding support portions 37, 32c provided on the surface of the mounting tube 31 and the lower part of the rotating member 32, respectively, and biases the rotating member 32 so that the flat portion 32d becomes approximately horizontal and the insertion portion 32a remains inserted into the locking hole 21.

[0019] 3(a), when the insertion portion 32a of the rotating member 32 is inserted into the locking hole 21 of the inner tube 20 and the inner tube 20 is raised in the direction of arrow B so as to be pulled out of the outer tube 10, the lower edge of the locking hole 21 comes into contact with the inclined portion 32e, pushing up the insertion portion 32a. As a result, as shown in FIG. 3(b), the rotating member 32 rotates against the biasing force of the biasing member 33, and the insertion portion 32a is released from the locking hole 21.

[0020] While the inner tube 20 continues to be raised in the direction of arrow B, the rotating member 32 receives a biasing force in the direction of arrow C from the biasing member 33 and rotates to return to its original state as shown in FIG. 3(c), and the insertion portion 32a is inserted into one of the locking holes 21 of the inner tube 20. After the insertion portion 32a is inserted into the locking hole 21, the weight of the inner tube 20 causes the upper edge of the locking hole 21 to abut against the flat portion 32d of the insertion portion 32a, and the inner tube 20 is fixed to the outer tube 10. The engagement portion 32b formed on the rotating member 30 remains engaged with the through-hole 11 while the rotating member 30 is rotating, ensuring that the insertion portion 32a can be inserted into the locking hole 21.

[0021] According to the telescopic column 1 of this embodiment, pulling out the inner column 20 from the outer column 10 automatically and reliably engages and disengages the locking hole 21 of the inner column 20 with the insertion portion 32a of the turning member 30, thereby enabling quick and easy length adjustment while maintaining the strength of the telescopic column 1. When shortening the length of the telescopic column 1, the inner column 20 can be pushed into the outer column 10 while manually operating the turning member 30 to disengage the insertion portion 32a from the locking hole 21.

[0022] The through holes 11 and locking holes 21 formed in the outer cylinder 10 and inner cylinder 20 can also be used to attach brackets to support shelves, partitions, projector screens, etc., and forming a large number of these can increase the versatility of the telescopic support column 1. However, the through hole 11 formed in the outer cylinder 10 is not essential to the present invention, and it is also possible to insert the insertion portion 32a of the rotating member 32 into the locking hole 21 of the inner cylinder 20 above the outer cylinder 10, etc., without passing through the through hole 11.

[0023] In this embodiment, the outer tube 10 and inner tube 20 are both formed in a rectangular tube shape, but the inner cross section of the outer tube 10 only needs to be formed in a rectangular shape to match the outer cross section of the inner tube 20, and the outer cross section of the outer tube 10 may have other shapes such as a circular shape. [Explanation of symbols]

[0024] 1 telescopic column 10 outer cylinder 11 Through hole 20 Inner cylinder 21 Locking hole 30 Fixing member 31 Mounting tube 32 Rotating member 32a Insertion part 32b Engagement part 33 biasing member

Claims

1. An extendable support column includes an outer tube having a rectangular inner circumferential cross section and an inner tube having a rectangular outer circumferential cross section that is inserted into the outer tube from above, and the extendable support column can be extended and retracted by changing the insertion length of the inner tube relative to the outer tube, The inner cylinder has a plurality of locking holes formed along the longitudinal direction, Further provided is a fixing member attached to an upper portion of the outer cylinder, the fixed member includes a mounting cylinder fitted onto the outer cylinder, a rotating member rotatably supported by the mounting cylinder, and a biasing member that biases the rotating member, the rotating member has an insertion portion that is biased by the biasing member so as to be inserted into the locking hole, and by rotating against the biasing force of the biasing member, the insertion portion is released from the locking hole; The outer cylinder has a plurality of through holes formed along the longitudinal direction, the insertion portion is inserted into the locking hole through one of the through holes, The rotating member is an extendable support having an arc-shaped engaging portion that maintains an engaged state with another through hole during rotation.

2. The insertion portion is formed so that its width in the vertical direction narrows toward its tip, 2. The telescopic support according to claim 1, wherein when the insertion portion is inserted into the locking hole and the inner tube is pulled out from the outer tube, the edge of the locking hole pushes up the insertion portion, causing the rotating member to rotate.

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