Adjustable length pole

Abstract

The present invention relates to a length-adjustable pole in which a length-adjustable pole is provided inside a main pole so that it can be extended and retracted vertically, and a length adjustment member is provided inside the length-adjustable pole, allowing a user to extend and retract the length-adjustable pole to a desired position with a simple operation.

Description

[Technical field]

[0001] The present invention relates to a length-adjustable pole, and in particular to a length-adjustable pole in which a length-adjustable pole is provided inside a main pole so that it can be extended and retracted vertically, and a length adjustment member is provided inside the length-adjustable pole, allowing a user to extend and retract the length-adjustable pole to a desired position with a simple operation. [Background technology]

[0002] In general, with the improvement of living standards and the increase in leisure time, the leisure goods market that provides specialized leisure goods related to various leisure activities is expanding. Camping equipment such as tents and tarps are essential for popularized leisure activities involving outdoor activities such as mountain climbing, traveling, and fishing, and various types of this type of camping equipment are provided by various manufacturers.

[0003] Meanwhile, camping equipment such as tents and tarps, although they differ in shape and material, all include a support pole and a tent body supported by the pole. The support pole can be formed in a foldable form for the purpose of facilitating portability or storage of the camping equipment, and the support poles applied to large tarps or tents that can accommodate a large number of people also emphasize structural stability to ensure supporting force.

[0004] The above-mentioned folding pole is disclosed in Korean Utility Model Publication No. 20-2020-0002457.

[0005] A conventional folding pole starts from the first pipe, and the second to fifth pipes are inserted in sequence so that their length can be adjusted by sliding, and a locking protrusion is positioned from the inside in a through hole provided on the rear end side of the second to fifth pipes.The pole is composed of an elastic part for pushing the locking protrusion outward, and a number of engagement holes into which the locking protrusion is fitted and locked at the tip end sides of the first to fourth pipes.

[0006] However, conventional folding poles are designed so that the length of the pipe is adjusted by inserting and fixing a locking protrusion into an engagement hole, and in order to adjust the length of the pipe, the user must directly apply pressure to the locking protrusion to release the connection between the engagement hole and the locking protrusion.

[0007] Therefore, not only is it inconvenient to adjust the length of the pipe, but there is also the problem that the pipe cannot be fixed properly since the locking projections are not inserted accurately into the engagement holes. Summary of the Invention [Problem to be solved by the invention]

[0008] Therefore, the object of the present invention is to solve the problems of the prior art described above, and to provide a length-adjustable pole in which a length-adjustment pole is provided inside a main pole so that it can be extended and retracted vertically, and a length adjustment member is provided inside the length-adjustment pole, allowing a user to extend and retract the length-adjustment pole to a desired position with a simple operation. [Means for solving the problem]

[0009] According to the features of the present invention for achieving the above object, the length adjustable pole of the present invention includes: a main pole made of a hollow tubular body, elongated vertically, having a locking hole penetrating front and rear in a side part, and set up on a floor surface; a length adjustment pole made of a hollow tubular body, elongated vertically, and set up inside the main pole so as to be slidable vertically; and a length adjustment member set up inside the main pole so as to be elastically deformable, and selectively protrude to the outside of the main pole through the locking hole and be locked and fixed when the length adjustment pole moves up and down along the inside of the main pole, The adjustment member includes a locking protrusion that protrudes outward through the locking hole when the length adjustment pole moves up and down, and a pair of elastic support pieces that protrude at a predetermined angle from both ends of the locking protrusion and are made of flexible plate material, with one end in contact with the inner surface of the length adjustment pole and the other end fixed to the locking protrusion, thereby elastically supporting the locking protrusion in one direction.The locking protrusion is block-shaped and has one face formed so as to incline downward, and includes a pressing portion that guides the pressing action of the locking protrusion, and a fixing portion that extends perpendicularly from the lower part of the pressing portion and is engaged and fixed inside the locking hole.

[0010] The pressing portion further includes a locking portion extending perpendicularly to the upper end of the pressing portion and locked in the upper inside of the locking hole.

[0011] The straight section H of the locking portion is 2 mm to 5 mm.

[0012] The width W of the locking projection is 7 mm to 7.5 mm.

[0013] The elastic support pieces are disposed at an angle of 30° to 60°.

[0014] The length L of the locking projection is characterized by being 13 mm to 20 mm. Effect of the Invention

[0015] The length-adjustable pole according to the present invention has the following advantages.

[0016] In the present invention, a length adjustment pole is provided inside the main pole so that it can be extended and retracted vertically, and a length adjustment member is provided inside the length adjustment pole, so that the length adjustment pole can be extended and retracted with a simple operation.

[0017] Therefore, the pole can be easily extended and retracted with a simple operation, which has the effect of further improving the operability and ease of use for the user.

[0018] In addition, since a pressing portion is formed on the locking protrusion, the locking fixation of the locking protrusion can be easily released by pulling the length adjustment pole, which has the advantage of improving operational convenience when extending the pole.

[0019] In addition, since the locking protrusion is formed with a locking portion and is locked to the inner upper end of the locking hole, there is an advantage in that the length adjustment pole can be prevented from being extended by the pulling force generated by strong winds.

[0020] Furthermore, since the fixing portion of the locking projection is locked in a direction perpendicular to the locking hole, there is an advantage that the locking and fixing force of the locking projection is improved. [Brief description of the drawings]

[0021] [Figure 1] 1 is a perspective view showing the configuration of a preferred embodiment of a length-adjustable pole according to the present invention; FIG. [Diagram 2] FIG. 2 is a perspective view of an adjustable length pole according to the present invention in an extended position. [Diagram 3] 1 is a cross-sectional view showing the configuration of a preferred embodiment of a length-adjustable pole according to the present invention; FIG. [Figure 4] FIG. 2 is a cross-sectional view showing the adjustable length pole of the present invention in an extended state. [Diagram 5]1 is an enlarged cross-sectional view showing a state in which a length adjustment member is installed inside a main pole constituting an embodiment of the present invention, with the length adjustment pole retracted into the inside of the main pole. FIG. [Figure 6] 10 is an enlarged cross-sectional view showing a state in which the length adjustment pole is extended outside the main pole constituting an embodiment of the present invention and the length adjustment member is engaged and fixed in the engaging hole. FIG. [Figure 7] 1 is an enlarged front view showing a state in which the length adjustment pole is extended outside the main pole constituting an embodiment of the present invention and the length adjustment member is engaged and fixed in the engaging hole. FIG. [Figure 8] FIG. 2 is a perspective view showing a configuration of a length adjustment member constituting an embodiment of the present invention. [Figure 9] FIG. 2 is a front view showing a configuration of a length adjustment member constituting an embodiment of the present invention. [Figure 10] 4 is a side view showing a configuration of a length adjustment member constituting an embodiment of the present invention. FIG. [Figure 11] 13 is a cross-sectional view showing a state in which a locking protrusion constituting another embodiment of the present invention is fixed to a locking hole. FIG. [Figure 12] FIG. 13 is a front view showing the configuration of a length adjusting member constituting another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the length-adjustable pole according to the present invention will be described in detail with reference to the accompanying drawings.

[0023] FIG. 1 is a perspective view showing the configuration of a preferred embodiment of a length-adjustable pole according to the present invention, FIG. 2 is a perspective view showing the length-adjustable pole according to the present invention in an extended state, FIG. 3 is a cross-sectional view showing the configuration of a preferred embodiment of a length-adjustable pole according to the present invention, FIG. 4 is a cross-sectional view showing the length-adjustable pole according to the present invention in an extended state, FIG. 5 is an enlarged cross-sectional view showing a state in which a length adjustment member is installed inside a main pole constituting an embodiment of the present invention, when the length adjustment pole is retracted into the inside of the main pole constituting an embodiment of the present invention, FIG. 6 is an enlarged cross-sectional view showing a state in which the length adjustment member is engaged and fixed in a locking hole when the length adjustment pole is extended outside the main pole constituting an embodiment of the present invention, FIG. 7 is an enlarged front view showing a state in which the length adjustment member is engaged and fixed in a locking hole when the length adjustment pole is extended outside the main pole constituting an embodiment of the present invention, FIG. 8 is a perspective view showing the configuration of the length adjustment member constituting an embodiment of the present invention, FIG. 9 is a front view showing the configuration of the length adjustment member constituting an embodiment of the present invention, and FIG. 10 is a side view showing the configuration of the length adjustment member constituting an embodiment of the present invention.

[0024] As shown in these figures, the length-adjustable pole according to the present invention includes a main pole 10 made of a hollow tube, elongated vertically, having a locking hole 12 penetrating front and rear in a side portion thereof, and set up on a floor surface; a length-adjusting pole 20 made of a hollow tube, elongated vertically, and set up inside the main pole 10 so as to be movable up and down; and a length-adjusting member 30 set up inside the main pole 10 so as to be elastically deformable, and selectively protruding to the outside of the main pole 10 through the locking hole 12 and locked when the length-adjusting pole 20 moves up and down along the inside of the main pole 10. The length-adjusting member 30 is fixed to the length-adjusting pole 20 by selectively protruding to the outside of the main pole 10 through the locking hole 12. The length-adjusting pole 20 includes a locking protrusion 32 that protrudes outward through the locking hole 12 when the length-adjusting pole 20 moves up and down, and a pair of elastic support pieces 40 that are made of a flexible plate material and are protruded from both ends of the locking protrusion 32 so as to be inclined at a predetermined angle, and have one end that is in close contact with the inner surface of the length-adjusting pole 20 and the other end that is fixed to the locking protrusion 32, thereby elastically supporting the locking protrusion 32 in one direction. The locking protrusion 32 is block-shaped and has one surface that is inclined downward. The locking protrusion 32 includes a pressing portion 34 that guides the pressing action of the locking protrusion 32, and a fixing portion 36 that extends perpendicularly from the lower portion of the pressing portion 34 and is engaged and fixed inside the locking hole 12.

[0025] The main pole 10 is made of a metal or plastic material, and is a hollow tube that is long in the vertical direction. The main pole 10 may be of various shapes, such as a cylindrical tube or a rectangular tube, and the following description will be given based on the rectangular tube.

[0026] The main pole 10 is used in a state where it is set upright or inclined to the floor surface, and serves to support a length adjustment pole 20 (described later) that is installed inside the main pole 10 so as to be slidable up and down.

[0027] The main pole 10 has a side surface provided with a locking hole 12. A plurality of locking holes 12 are formed at regular intervals along the side surface of the main pole 10.

[0028] 7, the locking hole 12 has an elongated hole shape and is drilled vertically. A locking protrusion 32 of a length adjustment member 30 described later is inserted through the inside of the locking hole 12 and selectively fixed.

[0029] That is, a receiving stand 14 is provided on the lower part of the main pole 10. The receiving stand 14 has a hexahedral block shape. The lower surface of the receiving stand 14 is gradually reduced in area in the downward direction and gradually becomes pointed toward the bottom.

[0030] A portion of the support is inserted into the lower end of the main pole 10, and the remaining portion of the support protrudes from the lower portion of the main pole 10. The support 14 is fixedly installed at the lower end of the main pole 10 and serves to support the lower end of the main pole 10 so that it does not come into contact with the floor surface.

[0031] A length-adjusting pole 20 is provided inside the main pole 10. The length-adjusting pole 20 is made of a metal or plastic material, like the main pole 10, and is a hollow tube that is long in the vertical direction. The length-adjusting pole 20 can be made of various tubes, such as a cylindrical tube or a square tube, and the following description will be given based on the square tube.

[0032] The length adjustment pole 20 has an outer diameter smaller than the inner diameter of the main pole 10. The length adjustment pole 20 is provided inside the main pole 10 so as to be slidable up and down. The length adjustment pole 20 extends upward through the upper opening of the main pole 10, and is a part by which the length of the entire pole is adjusted.

[0033] A first locking hole 22 may be provided on the side of the length-adjustable pole 20. When the length-adjustable pole according to the present invention is applied in two stages, the length-adjustable pole 20 does not need to be provided with the first locking hole 22, but when the length-adjustable pole according to the present invention is applied in three stages or more, the first locking hole 22 must be applied.

[0034] Therefore, the embodiment of the present invention will be described in detail with reference to the drawings showing the first locking hole 22 by adopting a structure using a three-stage pole.

[0035] 6 and 7, the first locking hole 22 is elongated and penetrates vertically like the locking hole 12 provided in the main pole 10. A locking protrusion 32 of a first length adjustment member 30, which will be described later, is inserted into the inside of the first locking hole 22 and selectively fixed thereto.

[0036] The length adjustment member 30 will be described in detail below with reference to FIGS.

[0037] A length adjustment member 30 is provided inside the length adjustment pole 20. The length adjustment member 30 is broadly composed of a locking protrusion 32 and an elastic support piece 40. The locking protrusion 32 has a hexahedral block shape and is composed of a pressing part 34 having a downwardly inclined surface on the upper surface, and a fixing part 36 extending perpendicularly from the lower part of the pressing part 34 and locked inside the locking hole 12.

[0038] The pressing portion 34 has a hexahedral block shape with a downwardly inclined surface on the upper surface, and is a portion that protrudes forward of the locking hole 12 .

[0039] In other words, when the length adjustment pole 20 extends upward from the main pole 10, the downward inclined surface of the pressing portion 34 protruding outside the locking hole 12 comes into contact with the inner edge portion of the locking hole 12, thereby easily performing the pressing action of the locking protrusion 32.

[0040] When the length adjustment pole 20 is pulled upward by the user, due to the downward inclined surface structure of the pressing portion 34, it comes into contact with the inner edge portion located above the locking hole 12, and the locking protrusion 32 presses along the inclined surface, so that the user can easily press the locking protrusion 32 by just pulling it, without having to press the locking protrusion 32 separately.

[0041] A fixing portion 36 is provided on a lower portion of the pressing portion 34. The fixing portion 36 is formed so as to protrude in a direction perpendicular to the locking hole 12. When the locking protrusion 32 is locked and fixed in the locking hole 12, the fixing portion 36 protrudes in a direction perpendicular to the locking hole 12.

[0042] Since the locking protrusion 32 is locked in the locking hole 12 by the fixing portion 36, the locking protrusion 32 is not easily released unless a certain amount of pressure is applied to the length adjustment pole 20, and when the user presses the length adjustment pole 20 with a certain amount of pressure or more, the locking protrusion 32 moves inward toward the length adjustment pole 20, thereby releasing the locking of the length adjustment pole 20.

[0043] In other words, when the length adjustment pole 20 is moved upward to extend its length, the locking protrusion 32 presses along the downward inclined surface of the pressing portion 34, thereby allowing the length adjustment pole 20 to be easily raised with a simple operation.

[0044] Conversely, when moving the length adjustment pole 20 downward to shorten the length of the length adjustment pole 20, the user can press the length adjustment pole 20 with a certain amount of pressure or more to release the fixation between the fixing portion 36 and the engagement hole 12.

[0045] As described above, since the fixing portion 36 protrudes into the locking hole 12 in a direction perpendicular to the lower interior, the locking is not released when a certain pressing force or less is applied to the length adjustment pole 20, and the locking is released only when a certain pressing force or more is applied to the length adjustment pole 20, thereby preventing the locking between the fixing portion 36 and the locking hole 12 from being easily released when a certain pressing force or less is applied.

[0046] Elastic support pieces 40 are provided on the upper and lower sides of the locking protrusion 32. The elastic support pieces 40 are made of a flexible plate material and are protruded at a predetermined angle from both ends of the upper and lower sides of the locking protrusion 32. One end of the elastic support piece 40 is in close contact with the inner surface of the length adjustment pole 20, and the other end of the elastic support piece is fixed to the locking protrusion 32, thereby elastically supporting the locking protrusion 32 in one direction.

[0047] In addition, a support end 42 is provided at an end of the elastic support piece 40. The support end 42 is bent in the opposite direction to the elastic support piece 40, as shown in Fig. 9. The support end 42 is bent at the end of the elastic support piece 40 and configured to be in surface contact with the inner surface of the length adjustment pole 20, thereby minimizing friction between the inner surface of the length adjustment pole 20 and the elastic support piece 40 when the elastic support piece 40 is elastically deformed.

[0048] The specifications of the length adjusting member 30 will be described in detail below.

[0049] In the case of the pressing portion 34, the inclination angle is preferably within the range of 40° to 50°.

[0050] This is because, based on the pulling force of an adult, an average of 8 kgf can be applied, and the inclination angle of the pressing portion 34 must be within the range of 40° to 50° so that the locking protrusion 32 can perform a pressing operation when a pulling force of 6 kgf to 8 kgf based on the pulling force of an adult is applied to the pressing portion 34.

[0051] The length L and width W of the locking projection 32 are preferably within the ranges of 13 mm to 20 mm and 7 mm to 7.5 mm.

[0052] Based on the criteria that the inclination angle of the pressing portion 34 and the straight section of the fixing portion 36 are within the ranges of 40° to 50° and 2 mm to 5 mm, respectively, it is preferable that the length L and width W of the locking protrusion are within the ranges of 13 mm to 20 mm and 7 mm to 7.5 mm.

[0053] Based on the pulling force (6kgf~8kgf) and pushing force (8kgf~10kgf) of an adult, the length L and width W of the locking protrusion 32 must be within the ranges of 13mm~20mm and 7mm~7.5mm, respectively, so that the operation of the locking protrusion 32 can be a locking and unlocking operation within the appropriate design range.

[0054] In the case of the elastic support piece 40, the installation angle is preferably within the range of 30° to 60°.

[0055] In the above description, the pulling force and pushing force of an adult can be applied to the elastic support piece 40 at 6kgf to 8kgf and 8kgf to 10kgf, respectively, and the installation angle of the elastic support piece 40 should be within the range of 30° to 60° so that the elastic support piece 40 can be elastically deformed for the operation of the locking protrusion 32 taking into account the pulling force and pushing force.

[0056] By applying the inclination angle of the pressing portion 34, the length L and width W of the locking protrusion 32, and the installation angle of the elastic support piece 40 to the design as described above, not only can the user smoothly extend and retract the length-adjustable pole 20, but appropriate elastic force and locking force can be applied to the locking protrusion 32 to maintain the fixing force of the locking protrusion.

[0057] A first length-adjusting pole 24 may be additionally provided inside the length-adjusting pole 20. The first length-adjusting pole 24 may be selectively installed when the length-adjustable pole according to the present invention has three stages.

[0058] The first length adjustment pole 24 has a structure similar to that of the length adjustment pole 20, and it is preferable that the outer diameter of the first length adjustment pole 24 is smaller than the inner diameter of the length adjustment pole 20 so that the first length adjustment pole 24 is slidably arranged inside the length adjustment pole 20.

[0059] The first length-adjusting pole 24 is provided inside the length-adjusting pole 20 so as to be slidable up and down, and can be extended or retracted upward along the inside of the length-adjusting pole 20 .

[0060] A length adjustment member 30 is provided inside the first length adjustment pole 24, similar to the length adjustment pole 20. The length adjustment member 30 has a similar structure to the length adjustment pole 20, and therefore a detailed description thereof will be omitted.

[0061] A fixing pin member 50 is provided at the upper end of the first length adjustment pole 24. The fixing pin member 50 includes a fixing pin 54 and a fixing body 52. ​​The fixing body 52 has a hexahedral block shape, with one portion thereof being press-fitted and fixed inside the first length adjustment pole 24 and the remaining portion protruding upward. The fixing body 52 is installed at the upper opening of the first length adjustment pole 24 and serves to seal the upper opening of the first length adjustment pole 24.

[0062] A fixing pin 54 is installed at the center of the upper end of the fixed body 52. ​​The fixing pin 54 is integral with the fixed body 52, has a cylindrical shape, and is formed long in the vertical direction. The fixing pin 54 protrudes upward from the center of the upper surface of the fixed body 52. ​​The fixing pin 54 is provided with a plurality of rope fastening grooves (not shown) on its outer periphery so that it can be directly fixed to a tent or awning, or a rope or string connected to the tent or awning can be wound around it to be fixed.

[0063] FIG. 11 is a cross-sectional view showing a state in which a locking protrusion constituting another embodiment of the present invention is fixed in a locking hole, and FIG. 12 is a front view showing the configuration of a length adjustment member constituting another embodiment of the present invention.

[0064] The locking projection of the length adjusting member constituting another embodiment of the present invention will be described in detail with reference to Figs.

[0065] A locking portion 38 is further provided on an upper portion of the pressing portion 34. The locking portion 38 is formed to protrude in a direction perpendicular to the upper inside of the locking hole 12. When the locking protrusion 32 is locked in the locking hole 12, the locking portion 38 can be locked to an upper edge of the locking hole 12.

[0066] Since the locking protrusion 32 is locked to the upper edge of the locking hole 12 by the locking portion 38, the locking protrusion 32 is not easily released unless a pulling force of a certain level or more is applied to the length adjustment pole 20, and when the user pulls the length adjustment pole 20 with a pressing force of a certain level or more, the locking protrusion 32 is released and the length adjustment pole 20 can be extended.

[0067] In addition, the locking portion 38 may be formed to penetrate the outside of the locking hole 12 and disposed so that a portion of the locking portion 38 protrudes outside the locking hole 12 .

[0068] In other words, since the locking portion 38 protrudes into the locking hole 12 in a direction perpendicular to the upper interior, and a portion of the locking portion 38 protrudes outward from the locking hole 12, the locking is not released when a pulling force below a certain level is applied to the length adjustment pole 20, and the locking is released only when a pulling force above a certain level is applied to the length adjustment pole 20, thereby preventing the locking portion 38 and the locking hole 12 from being easily released when a pulling force below a certain level is applied.

[0069] Since the locking portion 38 is formed on the upper part of the pressing portion 34, the locking fixation between the locking protrusion 32 and the locking hole 12 is not easily released, and the length adjustment pole 20 can be prevented from extending, especially when a pulling force is applied to the length adjustment pole 20 by strong wind.

[0070] Moreover, it is preferable that the straight section H of the locking portion 38 is within a range of 2 mm to 5 mm.

[0071] This is because, based on the pulling force of an adult, an average pulling force of 8 kgf can be applied, and when a pulling force of 6 kgf to 8 kgf based on the pulling force of an adult is applied to the locking portion 38, the straight section H of the locking portion 38 must be within the range of 2 mm to 5 mm so that the locking projection 32 can be released from the locking fixing.

[0072] In addition, when the length adjustment pole 20 is pulled by a strong wind, a pulling force of generally about 6 kgf or less acts on the length adjustment pole 20, so it is preferable that the straight section H of the engaging portion 38 be within the range of 2 mm to 5 mm.

[0073] The straight section of the fixing portion 36 may be longer than the straight section of the locking portion 38 .

[0074] The locking portion 38 must be released from its locked state in order to adjust the length when a pulling force of a certain level or more is applied, but the fixing portion 36 must remain locked when the user does not press the locking protrusion 32. Therefore, it is preferable that the straight section h of the fixing portion 36 is formed longer than the straight section of the locking portion 38.

[0075] Hereinafter, the operation of the length-adjustable pole of the present invention having the above-mentioned configuration will be described with reference to Figs.

[0076] First, in order for a user to extend the length-adjustable pole, the user holds the end of the length-adjustable pole 20 or the first length-adjustable pole 24 inserted into the main pole 10 with his / her hand and pulls it upward.

[0077] When the user extends the length adjustment pole 20, the length adjustment pole 20 rises from the main pole 10, and after moving the length adjustment pole 20 upward, the user can insert the locking protrusion 32 into the locking hole 12 provided on the side of the main pole 10 to extend the length adjustment pole 20.

[0078] If the user wishes to fix the locking protrusion 32 to the locking hole 12 directly above rather than to lock into the adjacent locking hole 12, the user can pull the length adjustment pole 20 at a certain speed or greater to prevent the locking protrusion 32 from being locked into the locking hole 12 that is not desired to be locked.

[0079] In other words, when the length adjustment pole 20 moves in the extension direction, the locking protrusion 32 can be easily detached by the pressing portion 34 of the locking protrusion 32, and conversely, after the extension operation of the length adjustment pole 20 is completed, the fixing portion 36 of the locking protrusion can be firmly locked in a direction perpendicular to the lower edge portion of the locking hole 12.

[0080] In addition, when the length adjustment pole 20 is to be contracted with the locking protrusion 32 locked in the locking hole 12, the user moves the length adjustment pole 20 in the extension direction (upward) to press the locking protrusion 32 so that it elastically deforms toward the inside of the main pole 10, and then moves the length adjustment pole 20 downward at a fast speed, thereby contracting the length adjustment pole 20.

[0081] The length-adjustable pole of the present invention can be used as a length-adjustable extension part in various fields, not only for tents in the leisure industry, but also for tarps and awnings.

[0082] The scope of the present invention is not limited to the above-described exemplary embodiments, and many other variations based on the present invention will be possible for those skilled in the art within the above technical scope. The claims as originally filed in this application are set forth below. [1] A main pole is a hollow tube that is long in the vertical direction and has a locking hole that penetrates the side surface from front to back. The main pole is set up on the floor. A length adjustment pole is made of a hollow tube, is formed long vertically, and is provided inside the main pole so as to be slidable vertically; a length adjustment member that is elastically deformably provided inside the main pole and selectively protrudes outside the main pole through the locking hole and is locked and fixed when the length adjustment pole moves up and down along the inside of the main pole, The length adjustment member is A locking protrusion that protrudes outward through the locking hole when the length adjustment pole moves up and down; a pair of elastic support pieces each protruding at a predetermined angle from both ends of the locking protrusion, each made of a flexible plate material, one end of which is intimately attached to the inner surface of the length adjustment pole and the other end of which is fixed to the locking protrusion, thereby elastically supporting the locking protrusion in one direction; [2] The locking projection is A locking portion extending perpendicularly from the upper end portion and locked in the upper interior of the locking hole; A fixing portion extending perpendicularly from the lower end portion and fixed to the lower inside of the locking hole; The length-adjustable pole described in [1] above includes a pressing portion formed between the locking portion and the fixed portion with one surface inclined downward, which guides the pressing action of the locking protrusion. [3] The locking portion is The length-adjustable pole described in [2] above is characterized in that it is formed so as to penetrate the outside of the locking hole and is positioned so that a portion of it protrudes outside the locking hole. [4] The length-adjustable pole described in [2] above, characterized in that the straight section of the fixing part is formed longer than the straight section (H) of the engaging part. [5] The length-adjustable pole described in [2] above, characterized in that the straight section (H) of the engaging portion is 2 mm to 5 mm. [6] The length-adjustable pole described in [1] above, characterized in that the installation angle of the elastic support piece is 30° to 60°. [7] The length-adjustable pole according to [1] above, characterized in that the length (L) of the locking protrusion is 13 mm to 20 mm. [8] The length-adjustable pole described in [1] above, characterized in that the width (W) of the locking protrusion is 7 mm to 7.5 mm.

Claims

1. A main pole is a hollow tube that is long in the vertical direction and has a locking hole that penetrates the side surface from front to back. The main pole is set up on the floor. A length adjustment pole is made of a hollow tube, is formed long vertically, and is provided inside the main pole so as to be slidable vertically; a length adjustment member that is elastically deformably provided inside the main pole and selectively protrudes outside the main pole through the locking hole and is locked and fixed when the length adjustment pole moves up and down along the inside of the main pole, The length adjustment member is A locking protrusion that protrudes outward through the locking hole when the length adjustment pole moves up and down; a pair of elastic support pieces each made of a flexible plate material, each protruding from both ends of the locking protrusion at a predetermined angle, each elastic support piece having one end in close contact with the inner surface of the length adjustment pole and the other end fixed to the locking protrusion, thereby elastically supporting the locking protrusion in one direction; The locking projection is A locking portion extending perpendicularly from the upper end portion and locked in the upper interior of the locking hole; A fixing portion extending perpendicularly from the lower end portion and fixed to the lower inside of the locking hole; a pressing portion having a surface inclined downward between the locking portion and the fixing portion, the pressing portion guiding a pressing operation of the locking protrusion, A length-adjustable pole, the engaging portion being formed to penetrate the outside of the engaging hole and positioned so that a portion of the engaging portion protrudes outside the engaging hole.

2. The length-adjustable pole according to claim 1, wherein the straight section of the fixing portion is longer than the straight section (H) of the locking portion.

3. The length-adjustable pole according to claim 1, characterized in that the straight section (H) of the locking portion is 2 mm to 5 mm.

4. The length-adjustable pole according to claim 1, characterized in that the installation angle of the elastic support piece is 30° to 60°.

5. The length-adjustable pole according to claim 1, characterized in that the length (L) of the locking protrusion is 13 mm to 20 mm.

6. The length-adjustable pole according to claim 1, characterized in that the width (W) of the locking protrusion is 7 mm to 7.5 mm.

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