Stepless pull rod and luggage case comprising same

Abstract

The utility model relates to the technical field of luggage cases, in particular to an electrodeless pull rod which comprises a first telescopic pipe, a second telescopic pipe and a third telescopic pipe, the second telescopic pipe is sleeved with the first telescopic pipe, the bottom of the second telescopic pipe is fixedly connected with a first positioning assembly, a positioning strip is arranged in the second telescopic pipe, second positioning holes are formed in the positioning strip, and the distance from the first second positioning hole to the second second positioning hole from top to bottom is larger than the distance between the other adjacent second positioning holes. The second positioning hole is connected with a second positioning assembly in a clamped mode. The third telescopic pipe is sleeved with the second telescopic pipe, and the bottom of the third telescopic pipe is fixedly connected with the second positioning assembly. By additionally arranging a positioning strip, a first positioning assembly and a second positioning assembly, stepless stretching and retracting of the pull rod are achieved; the trouble that a user needs to press a button for height adjustment for a long time is solved; and when the pull rod is arranged to be too high, a user feels strenuous and uncomfortable when pushing the luggage case.

Description

Technical Field

[0001] The utility model relates to the technical field of luggage cases, in particular to a stepless pull rod and a luggage case containing the pull rod. Background Art

[0002] Conventional suitcases use rollers rolling on racks to extend and fix the handle at any height; however, users usually only use a few fixed heights when using the handle, and need to long-press a button to adjust the height, which is rather troublesome; in addition, when the handle is set too high, the forearm of the hand tilts upward, which is not in line with ergonomics, making it difficult and uncomfortable to push the suitcase. Utility Model Content

[0003] To solve the problem that users need to long press the button to adjust the height, which is rather troublesome; when the pull rod is set too high, it feels laborious and uncomfortable to push the suitcase.

[0004] The utility model provides an infinite pull rod, comprising a first telescopic tube, a second telescopic tube and a third telescopic tube; the first telescopic tube is provided with a first positioning hole; the second telescopic tube is sleeved inside the first telescopic tube, the bottom of the second telescopic tube is fixedly connected with a first positioning component that is snap-connected with the first positioning hole, a positioning strip is provided inside the second telescopic tube, a second positioning hole is provided on the positioning strip, a distance from the first second positioning hole to the second second positioning hole from top to bottom is greater than a distance between other adjacent second positioning holes, and the second positioning hole is snap-connected with the second positioning component; the third telescopic tube is sleeved inside the second telescopic tube, the bottom of the third telescopic tube is fixedly connected with the second positioning component, the top of the third telescopic tube is fixedly connected with a handle, a button is provided on the handle, and a transmission member fixedly connected with the button is provided inside the third telescopic tube.

[0005] Preferably, the distance from the first second positioning hole to the second second positioning hole is 40 mm to 70 mm.

[0006] Preferably, the distances between the remaining adjacent second positioning holes are independently selected to be 1.5 cm to 2.5 cm.

[0007] Preferably, the distances between the remaining adjacent second positioning holes are equal, or the distances between the remaining adjacent second positioning holes are staggered.

[0008] Preferably, 4 to 12 second positioning holes are provided.

[0009] Preferably, the second positioning assembly includes a second press-in piece, a second engaging piece, a second shell and a second connecting piece; the top of the second press-in piece contacts the bottom of the transmission piece, and the bottom of the second press-in piece is tilted; the top of the second engaging piece is tilted and fits with the bottom of the second press-in piece, a second spring is provided on one side of the second engaging piece, and a second protrusion matching the second fixing hole is provided on the other side of the second engaging piece; the second shell is wrapped around the outside of the second press-in piece and the second engaging piece, and the top of the second shell is nested in the bottom of the first telescopic tube; the bottom end of the third telescopic tube is provided with a first connecting hole, and the second connecting piece is snap-connected to the first connecting hole to fix the second shell and the first telescopic tube.

[0010] Preferably, the first positioning assembly includes a first press-in piece, a first engaging piece, a first shell and a first connecting piece; at least a portion of the first press-in piece and the second shell are located in the same straight line, and the bottom of the first press-in piece is tilted; the top of the first engaging piece is tilted and fits with the bottom of the first press-in piece, one side of the first engaging piece is provided with a first spring, and the other side of the first engaging piece is provided with a first protrusion matching the first positioning hole; the first shell is wrapped around the outside of the first press-in piece and the first engaging piece, the top of the first shell is nested in the bottom of the second telescopic tube, one side of the top of the first shell is extended outward to provide a third positioning hole, and the third positioning hole and the second protrusion are consistent; the bottom end of the second telescopic tube is provided with a second connecting hole, and the first connecting piece is snap-connected to the second connecting hole to fix the first shell and the second telescopic tube.

[0011] Preferably, a second sleeve for limiting the second connecting piece is provided on the inner side of the top of the second telescopic tube, and the third telescopic tube is slidably connected to the inner side of the second sleeve; a first sleeve for limiting the first connecting piece is provided on the inner side of the top of the first telescopic tube, and the second telescopic tube is slidably connected to the inner side of the second sleeve.

[0012] Preferably, a placement piece for placing the handle is provided at the top of the first telescopic tube, and a base is provided at the bottom of the first telescopic tube.

[0013] The utility model also provides a suitcase, comprising the above-mentioned stepless pull rod.

[0014] The beneficial effects of the present invention are reflected in that, by adding a positioning strip, a first positioning component and a second positioning component, the pull rod can be infinitely extended and retracted, and the distance from the first second positioning hole to the second second positioning hole is set to be greater than the distance between the remaining adjacent second positioning holes from top to bottom; the problem that the user needs to long press the button to adjust the height, which is rather troublesome; and the problem that when the pull rod is set too high, it feels laborious and uncomfortable to push the suitcase. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional diagram provided by the utility model.

[0016] Figure 2 for Figure 1 Exploded diagram.

[0017] Figure 3 for Figure 1 Cross-sectional view of .

[0018] Figure 4 This is an exploded view of the first positioning assembly provided by the utility model.

[0019] Figure 5 This is a cross-sectional view of the first positioning assembly provided by the utility model.

[0020] Figure 6 This is an exploded view of the second positioning assembly provided by the utility model.

[0021] Figure 7 This is a cross-sectional view of the second positioning assembly provided by the utility model.

[0022] In the figure: 1-first telescopic tube; 11-first positioning hole; 12-first connecting hole; 13-base; 2-second telescopic tube; 21-positioning strip; 211-second positioning hole; 22-first positioning assembly; 221-first press-in piece; 222-first engaging piece; 2221-first spring; 2222-first protrusion; 223-first shell; 2231-third positioning hole; 224-first connecting piece; 2241-second connecting hole; 23-second positioning assembly; 231-second press-in piece; 232-second engaging piece; 2321-second spring; 2322-second protrusion; 233-second shell; 234-second connecting piece; 24-second sleeve; 3-third telescopic tube; 31-handle; 311-button; 32-transmission piece; 33-first sleeve. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] Reference Figure 1-Figure 7A stepless pull rod comprises a first telescopic tube 1, a second telescopic tube 2 and a third telescopic tube 3; the first telescopic tube 1 is provided with a first positioning hole 11; the second telescopic tube 2 is sleeved inside the first telescopic tube 1, the bottom of the second telescopic tube 2 is fixedly connected with a first positioning assembly 22 which is engaged with the first positioning hole 11, a positioning strip 21 is provided inside the second telescopic tube 2, and a second positioning hole 211 is provided on the positioning strip 21, and the distance from the first second positioning hole 211 to the second second positioning hole 211 from top to bottom is greater than the distance between the other adjacent second positioning holes 211, such as Figure 2 As shown, the distance from the first second positioning hole 211 to the second second positioning hole 211 from top to bottom is the distance D in the figure, and the second positioning hole 211 is snap-connected with the second positioning assembly 23; the third telescopic tube 3 is sleeved inside the second telescopic tube 2, the bottom of the third telescopic tube 3 is fixedly connected to the second positioning assembly 23, the top of the third telescopic tube 3 is fixedly connected to the handle 31, the handle 31 is provided with a button 311, and the inside of the third telescopic tube 3 is provided with a transmission member 32 fixedly connected to the button 311.

[0025] By adding the positioning strip 21, the first positioning component 22 and the second positioning component 23, the pull rod can be infinitely extended and retracted. By setting the distance from the first second positioning hole 211 to the second second positioning hole 211 from top to bottom to be greater than the distance between the remaining adjacent second positioning holes 211, the problem that the user needs to long press the button 311 to adjust the height, which is rather troublesome, and the problem that when the pull rod is set too high, it feels laborious and uncomfortable to push the suitcase is solved.

[0026] In the initial state, the third telescopic tube 3 is received in the second telescopic tube 2, the second telescopic tube 2 is received in the first telescopic tube 1, the first telescopic tube 1 is fixed inside the luggage box, a fourth positioning hole is provided at the bottom of the first telescopic tube 1, the first positioning assembly 22 is engaged with the fourth positioning hole, thereby limiting the third telescopic tube 3 and the second telescopic tube 2 in the first telescopic tube 1; pressing the button 311 downward drives the transmission member 32 to contact the second positioning assembly 23, the second positioning assembly 23 pushes the first positioning assembly 22 to move downward, releasing the engagement between the first positioning assembly 22 and the fourth positioning hole, pulling the handle 31, and pulling the third telescopic tube 3 and the second telescopic tube 2 upward out of the first telescopic tube 1 together, until the first positioning assembly 22 is engaged with the top of the first telescopic tube 1, at this time the second positioning assembly 23 is engaged with the first positioning assembly 22.

[0027] Continue to press the button 311 and pull the handle 31 upward to drive the third telescopic tube 3 to extend out of the second telescopic tube 2. When pulling the handle 31 upward, you only need to press the button 311 once and then release it, without having to press it continuously, which is more convenient for users to use. In the process of pulling the third telescopic tube 3 upward, each time the button 311 is pressed, the second positioning components 23 engage with the second positioning holes 211 one by one from the first positioning components 22 along the positioning bar 21 until the second positioning components 23 are supported by the bottom end of the third telescopic tube 3. At this time, the second positioning components 23 are engaged with the second positioning holes 211 at the top of the positioning bar 21. In the process of pulling the third telescopic tube 3 upward, the user can stay at a suitable height according to their needs.

[0028] When storing the pull rod, it is only necessary to press the button 311 to drive the transmission member 32 to contact the second positioning component 23, release the engagement between the second positioning component 23 and the second positioning hole 211, push the handle 31 downward until the second positioning component 23 contacts the first positioning component 22 downward, release the engagement between the first positioning component 22 and the top of the first telescopic tube 1, continue to push the handle 31 downward until it can no longer be pushed, release the button 311, and the first positioning component 22 is engaged with the fourth positioning hole at the bottom of the first telescopic tube 1.

[0029] like Figure 2 As shown, in some embodiments, the distance between the first second positioning hole 211 and the second second positioning hole 211 is 40 mm to 70 mm.

[0030] Preferably, the distance between the first second positioning hole 211 and the second second positioning hole 211 is 5 cm, ensuring that the user can adjust the height by 5 cm by only pressing the button 311 once, which is simpler and more convenient to use. Compared with a conventional suitcase pull rod, the adjustment range of a single press of the button 311 is larger; the user can quickly adjust the height of the third telescopic tube 3, reducing the discomfort caused by the forearm of the hand tilting upward to push the suitcase due to the pull rod being set too high.

[0031] In some embodiments, the distances between the remaining adjacent second positioning holes 211 are independently selected to be 1.5 cm to 2.5 cm. Preferably, the distances between the remaining adjacent second positioning holes 211 are all selected to be 2 cm.

[0032] In some embodiments, the distances between the remaining adjacent second positioning holes 211 are equal, or the distances between the remaining adjacent second positioning holes 211 are staggered.

[0033] In some embodiments, 4 to 12 second positioning holes 211 are provided.

[0034] The more the number of the second positioning holes 211 is, the more height levels the user can adjust. Preferably, the second positioning holes 211 are provided with 7, which on the one hand meets the user's demand for height adjustment of the pull rod, and on the other hand ensures that the positioning strip 21 has sufficient strength to avoid damage to the positioning strip 21 due to too many and too dense holes.

[0035] The distance between adjacent second positioning holes 211 includes but is not limited to the following situations:

[0036] (1)4cm, 1.5cm, 1.5cm, 1.5cm, 1.5cm, 1.5cm, 1.5cm;

[0037] (2)5cm, 2cm, 2cm, 2cm, 2cm, 2cm;

[0038] (3)7cm, 2.2cm, 2.2cm, 2.2cm, 2.2cm, 2.2cm;

[0039] (4)5cm, 1.6cm, 1.7cm, 1.6cm, 1.7cm, 1.6cm;

[0040] (5)5cm, 1.6cm, 1.8cm, 1.6cm, 1.8cm, 1.6cm;

[0041] (6)5cm, 2cm, 1.6cm, 2cm, 1.6cm, 2cm;

[0042] (7)6.5cm, 1.6cm, 1.8cm, 1.6cm, 1.8cm, 1.6cm.

[0043] Under the premise that there are 7 second positioning holes 211, the distance between the first second positioning hole 211 and the second second positioning hole 211 is 5 cm, and the distances between the other adjacent second positioning holes 211 are all 2 cm, the adjustment range of the third telescopic tube 3 is 15 cm; when the distances between the other adjacent second positioning holes 211 are staggered and are 1.6 cm and 1.7 cm in case (4), the adjustment range of the third telescopic tube 3 is 13.2 cm. From the perspective of human mechanics, a height change of 1.8 cm has a significant impact on the comfort of the human hand. The core of ergonomics is that the design of tools and equipment should fit the natural form of the human body to the greatest extent possible to reduce fatigue and improve comfort and safety during work. For example, an ergonomic mouse, through a vertical or lateral design, allows the wrist and arm to naturally maintain a comfortable posture, avoid excessive twisting and stretching, and thus reduce hand fatigue and discomfort during use. This shows that even a small height adjustment, such as 1.8 cm, can have a significant impact on the user's hand posture and comfort.

[0044] like Figure 6 and Figure 7 As shown, in some embodiments, the second positioning assembly 23 includes a second press-in piece 231, a second engaging piece 232, a second shell 233 and a second connecting piece 234; the top of the second press-in piece 231 contacts the bottom of the transmission piece 32, and the bottom of the second press-in piece 231 is tilted; the top of the second engaging piece 232 is tilted and fits with the bottom of the second press-in piece 231, a second spring 2321 is provided on one side of the second engaging piece 232, and a second protrusion 2322 matching the second fixing hole is provided on the other side of the second engaging piece 232; the second shell 233 is wrapped around the outside of the second press-in piece 231 and the second engaging piece 232, and the top of the second shell 233 is nested in the bottom of the first telescopic tube 1; the bottom end of the third telescopic tube 3 is provided with a first connecting hole 12, and the second connecting piece 234 is engaged and connected to the first connecting hole 12 to fix the second shell 233 and the first telescopic tube 1.

[0045] Pressing the button 311 drives the transmission member 32 to contact the second pressing member 231, and the second pressing member 231 moves downward, pushing the second engaging member 232 to move to one side to compress the second spring 2321 until the second protrusion 2322 shrinks into the second shell 233, so that the height of the third telescopic tube 3 can be freely adjusted.

[0046] When the button 311 is released, the second spring 2321 pushes the second engaging member 232 , and the second protrusion 2322 is exposed from the second housing 233 , and is engaged and fixed when encountering the outer second positioning hole 211 , thereby fixing the third telescopic tube 3 .

[0047] like Figure 4 and Figure 5 As shown, in some embodiments, the first positioning assembly 22 includes a first press-in member 221, a first engaging member 222, a first shell 223 and a first connecting member 224; at least a portion of the first press-in member 221 and the second shell 233 are located in the same straight line, and the bottom of the first press-in member 221 is tilted; the top of the first engaging member 222 is tilted and fits with the bottom of the first press-in member 221, one side of the first engaging member 222 is provided with a first spring 2221, and the other side of the first engaging member 222 is provided with a spring that matches the first positioning hole 11 The first shell 223 is wrapped around the outside of the first press-in piece 221 and the first engaging piece 222, the top of the first shell 223 is nested in the bottom of the second telescopic tube 2, and one side of the top of the first shell 223 extends outward to provide a third positioning hole 2231, and the third positioning hole 2231 coincides with the second protrusion 2322; the bottom end of the second telescopic tube 2 is provided with a second connecting hole 2241, and the first connecting piece 224 is engaged and connected to the second connecting hole 2241 to fix the first shell 223 and the second telescopic tube 2.

[0048] Pressing the button 311 drives the transmission member 32 to contact the second pressing member 231, and the second pressing member 231 moves downward, releasing the engagement between the second engaging member 232 and the second positioning hole 211, and pushing the second positioning assembly 23 downward until the bottom of the second shell 233 contacts the top of the first pressing member 221, so that the third telescopic tube 3 is stored in the second telescopic tube 2; continue to push the handle 31 downward, the second shell 233 pushes the first pressing member 221 to move downward, the first pressing member 221 pushes the first engaging member 222 to move to one side to compress the first spring 2221, and the first protrusion 2222 shrinks into the first shell 223, releasing the engagement between the first engaging member 222 and the first connecting hole 12, so that the second telescopic tube 2 moves downward to be stored in the first telescopic tube 1.

[0049] like Figure 2 As shown, in some embodiments, a second sleeve 24 for limiting the second connecting member 234 is provided on the inner side of the top of the second telescopic tube 2, and the third telescopic tube 3 is slidably connected to the inner side of the second sleeve 24; a first sleeve 33 for limiting the first connecting member 224 is provided on the inner side of the top of the first telescopic tube 1, and the second telescopic tube 2 is slidably connected to the inner side of the second sleeve 24.

[0050] The caliber of the bottom of the second sleeve 24 is smaller than or equal to the second connecting piece 234, so as to prevent the second positioning assembly 23 and the third telescopic tube 3 from sliding out from the top of the second telescopic tube 2 when they move upward; in addition, a groove is provided on the side of the second sleeve 24, and a protrusion is provided on the top of the positioning strip 21, and the positioning strip 21 is fixed to the second sleeve 24 by the protrusion being engaged with the groove.

[0051] The diameter of the bottom of the first sleeve 33 is smaller than or equal to the first connecting member 224 , so as to prevent the first positioning assembly 22 and the second telescopic tube 2 from sliding out of the top of the first telescopic tube 1 when they move upward.

[0052] like Figure 2 As shown, in some embodiments, a placement piece for placing the handle 31 is provided at the top of the first telescopic tube 1 , and a base 13 is provided at the bottom of the first telescopic tube 1 .

[0053] The handle 31 can be completely stored in the placement piece. The placement piece protects the handle 31 and keeps the top of the suitcase flat, making it convenient for stacking and storing the suitcase during transportation. The base 13 is provided to connect the first telescopic tube 1 and the suitcase body.

[0054] The utility model also provides a suitcase, comprising the above-mentioned stepless pull rod.

[0055] How it works:

[0056] In the initial state, the third telescopic tube 3 is received in the second telescopic tube 2, the second telescopic tube 2 is received in the first telescopic tube 1, and the first telescopic tube 1 is fixed inside the luggage box body; the first protrusion 2222 is engaged with the fourth positioning hole, so that the third telescopic tube 3 and the second telescopic tube 2 are confined in the first telescopic tube 1.

[0057] When the user needs to use the pull rod, the button 311 is pressed downward to drive the transmission member 32 to resist the second positioning component 23 and move downward. The second positioning component 23 pushes the first pressing member 221 to move downward. The first pressing member 221 pushes the first engaging member 222 to move to one side and compresses the first spring 2221 until the first protrusion 2222 disengages from the fourth positioning hole. Then, the handle 31 is pulled upward to pull the third telescopic tube 3 and the second telescopic tube 2 out of the first telescopic tube 1 together until the first positioning component 22 moves to the top of the first telescopic tube 1 and the first protrusion 2222 is engaged with the first positioning hole 11. At this time, the second protrusion 2322 is engaged with the third positioning hole 2231.

[0058] Continue to press the button 311 to drive the transmission member 32 to move downward against the second pressing member 231, push the second engaging member 232 to move to one side to compress the second spring 2321, until the second protrusion 2322 shrinks into the second shell 233, release the engagement between the second protrusion 2322 and the third positioning hole 2231, pull the third telescopic tube 3 upward, and the height of the third telescopic tube 3 can be freely adjusted. Release the button 311, the second spring 2321 pushes the second engaging member 232, the second protrusion 2322 is exposed from the second shell 233, and is engaged and fixed when encountering the outer second positioning hole 211, thereby fixing the third telescopic tube 3.

[0059] When the user does not need to use the pull rod, the button 311 is pressed to drive the transmission member 32 to contact the second pressing member 231, and the second pressing member 231 moves downward, releasing the engagement of the second engaging member 232 and the second positioning hole 211, and pushing the second positioning assembly 23 downward until the bottom of the second shell 233 contacts the top of the first pressing member 221, so that the third telescopic tube 3 is stored in the second telescopic tube 2; continue to push the handle 31 downward, so that the transmission member 32 drives the second shell 233 to push the first pressing member 221 to move downward, the first pressing member 221 pushes the first engaging member 222 to move to one side to compress the first spring 2221, and the first protrusion 2222 shrinks into the first shell 223, releasing the engagement of the first engaging member 222 and the first connecting hole 12, and continues to push the handle 31 to move the second telescopic tube 2 downward until the handle 31 cannot be pushed. At this time, the first positioning assembly 22 moves to the bottom of the first telescopic tube 1, and the first protrusion 2222 is engaged with the fourth positioning hole, completing the storage of the pull rod.

[0060] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inside", "outside", "inner side", "outer side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Among them, "inside" refers to an internal or enclosed area or space. "Periphery" refers to the area surrounding a specific component or a specific area.

[0061] In the description of the embodiments of the present utility model, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stepless pull rod, characterized in that: include: A first telescopic tube (1) is provided with a first positioning hole (11); A second telescopic tube (2) is sleeved inside the first telescopic tube (1), and a first positioning assembly (22) is fixedly connected at the bottom thereof and is engaged with the first positioning hole (11); a positioning strip (21) is provided inside the second telescopic tube (2), and a second positioning hole (211) is provided on the positioning strip (21); a distance from the first second positioning hole (211) to the second second positioning hole (211) from top to bottom is greater than a distance between other adjacent second positioning holes (211); and a second positioning assembly (23) is engaged with the second positioning hole (211); The third telescopic tube (3) is sleeved inside the second telescopic tube (2), the bottom of which is fixedly connected to the second positioning assembly (23), and the top of which is fixedly connected to a handle (31), the handle (31) being provided with a button (311), and the inside of the third telescopic tube (3) being provided with a transmission member (32) fixedly connected to the button (311).

2. The stepless pull rod according to claim 1, characterized in that: The distance between the first second positioning hole (211) and the second second positioning hole (211) is 40 mm to 70 mm.

3. The stepless pull rod according to claim 1 or 2, characterized in that: The distances between the remaining adjacent second positioning holes (211) are each independently selected to be 1.5 to 2.5 cm.

4. The stepless pull rod according to claim 3, characterized in that: The distances between the remaining adjacent second positioning holes (211) are equal, or the distances between the remaining adjacent second positioning holes (211) are staggered.

5. The stepless pull rod according to claim 1, characterized in that: There are 4 to 12 second positioning holes (211).

6. The stepless pull rod according to claim 1, characterized in that: The second positioning component (23) comprises: The second pressing member (231) has a top that contacts the bottom of the transmission member (32) and a bottom that is inclined; A second engaging member (232), the top of which is tilted and fits with the bottom of the second pressing member (231), one side of which is provided with a second spring (2321), and the other side of which is provided with a second protrusion (2322) matching the second positioning hole; A second shell (233) is wrapped around the outer sides of the second pressing piece (231) and the second engaging piece (232), and the top of the second shell is nested in the bottom of the first telescopic tube (1); A second connecting member (234), a first connecting hole (12) is provided at the bottom end of the third telescopic tube (3), and the second connecting member (234) is snap-fitted and connected to the first connecting hole (12) to fixedly connect the second shell (233) and the first telescopic tube (1).

7. The stepless pull rod according to claim 6, characterized in that: The first positioning component (22) comprises: The first pressing member (221) has at least a portion located in the same straight line as the second shell (233), and a bottom portion arranged obliquely; A first engaging member (222), the top of which is tilted and fits with the bottom of the first pressing member (221), one side of which is provided with a first spring (2221), and the other side of which is provided with a first protrusion (2222) matching the first positioning hole (11); A first shell (223) is wrapped around the outside of the first pressing piece (221) and the first engaging piece (222), the top of which is nested in the bottom of the second telescopic tube (2), and one side of the top is extended outward to be provided with a third positioning hole (2231), wherein the third positioning hole (2231) is matched with the second protrusion (2322); A first connecting member (224), a second connecting hole (2241) is provided at the bottom end of the second telescopic tube (2), and the first connecting member (224) is snap-connected to the second connecting hole (2241) to fixedly connect the first shell (223) and the second telescopic tube (2).

8. The stepless pull rod according to claim 7, characterized in that: A second sleeve (24) for limiting the second connecting piece (234) is provided on the inner side of the top of the second telescopic tube (2), and the third telescopic tube (3) is slidably connected to the inner side of the second sleeve (24); a first sleeve (33) for limiting the first connecting piece (224) is provided on the inner side of the top of the first telescopic tube (1), and the second telescopic tube (2) is slidably connected to the inner side of the second sleeve (24).

9. The stepless pull rod according to claim 1, characterized in that: The top of the first telescopic tube (1) is provided with a placement piece for placing the handle (31), and the bottom of the first telescopic tube (1) is provided with a base (13).

10. A luggage case, characterized in that: A stepless pull rod comprising any one of claims 1 to 9.

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