WO2008022526A1

WO2008022526A1 - A stageless adjustable telescopic tube assembly with a frictional locking ring

Info

Publication number: WO2008022526A1
Application number: PCT/CN2007/002016
Authority: WO
Inventors: Jianzhong Chen
Original assignee: Jianzhong Chen
Priority date: 2006-08-16
Filing date: 2007-06-28
Publication date: 2008-02-28
Also published as: CN200946613Y

Abstract

A stageless adjustable telescopic tube assembly with a frictional locking ring has an inner tube, a outer tube and a locking device, wherein the inner tube and the outer tube are slidably engaged with each other by nesting. The locking device comprises a locking ring, a sliding block and an elastic element. The locking ring is a cylindrical slit ring, which is provided between the inner tube and the outer tube and fixed relative to the outer tube in an axial direction. On each one end of both sides of opening of the locking ring are formed two slant grooves, one end of each slant groove is close to each other, and the other end of each slantgroove is apart from each other. The sliding block is attached to the outer tube so as to slide relative to the outer tube. Two guiding pin are provided on the bottom surface of the sliding block so as to project downward. The two guiding pins are correspondingly engaged in the respective slant grooves of the locking ring. An elastic element is provided between a side of the sliding block and the outer tube. The sliding block is moved toward the end sides apart from each other of the two slant grooves by an elastic force of the elastic element, so that the locking ring retracts to lock the inner tube in place. The outer side opposite to the outer tube of the sliding block is provided with a releasing operation button. The telescopic tube assembly has advantages of stageless adjustable, easy to use, reliable locking, and wide applicable range.

Description

Stepless adjustment friction ring locking telescopic tube

The utility model relates to a telescopic tube with stepless adjustment. The telescopic tube can be installed on a vacuum cleaner as a vacuum rod, and can also be used as a support rod or an operation rod on items such as a mop, a camera, a clothes fork and the like.

Background technique

In modern life, the telescopic tube structure is a common structure, and it can be used in a wide range of telescopic mechanisms with various length adjustment requirements, such as a vacuum cleaner on a vacuum cleaner, a mop lever for a household mop, a support arm of a camera, and the like.

According to the patent investigation, there are no fewer than dozens of patents for existing telescopic tubes. Most of the telescopic tubes disclosed by these patent programs are level-adjusted. The most breakthrough and representative ones are:

On July 7, 2004, a utility model patent entitled "Dust Collector for Vacuum Cleaner" was published under the patent number 03239096.3. The patent scheme introduces a lock pin type locking vacuum tube, its specific The structure is as follows: It comprises an inner tube, an outer tube and an intermediate sleeve disposed between the inner tube and the outer tube and connected to the end of the outer tube; the inner tube tube wall is provided with a plurality of locking through holes, corresponding outer tubes and The middle sleeve is provided with a lever type elastic button. The lever type button is provided with a locking tongue. The locking tongue is supported by the elastic force from the outside to the inner wall of the inner tube, and is inserted into the locking hole of the outer wall to be pinned; Is a vacuum pipe,

'The wall of the tube is airtight and must be lined with an inner liner in the lumen of the inner tube. It is obvious that the length adjustment of the telescopic tube disclosed in the above aspect is hierarchical, and can only be positioned at each locking hole, which is limited by the limited degree of expansion and contraction, and is still inconvenient to use.

However, a small number of continuously adjustable telescopic tubes have a representative structure: mainly consisting of an inner tube, an outer tube and a fastening joint embedded in the end of the inner tube. The lumen of the telescopic tube is blocked by the fastening joint, and the whole lumen is unobstructed. Therefore, it can only be used as a support rod such as a mop rod or a clothes rail rod, and cannot be used as a vacuum rod of a vacuum cleaner, and has a narrow application range. .

Summary of the invention

The purpose of the utility model is to provide a stepless adjustment expansion and contraction tube with wide application range and high work reliability.

In order to achieve the above object, the technical solution adopted by the utility model is: a stepless adjustment friction ring locking type telescopic tube, comprising an inner tube, an outer tube and a pinning device, and the inner tube and the outer tube are internally and externally nested and slidingly connected, and the innovation thereof The point is that: the locking device is composed of a locking ring, a slider and an elastic element; the locking ring is a cylindrical open ring, which is embedded between the inner tube and the outer tube and is axially positioned and connected with respect to the outer tube, the locking ring The inner circumferential surface is in contact with the outer circumferential surface of the inner tube; the end portions of the locking ring opening are symmetrically disposed a chute, the ends of the two chutes are relatively close to each other, and the other end is relatively far away; the slider corresponds to the opening of the locking ring, is slidably connected with respect to the outer tube, and the bottom surface of the slider is provided with two guide columns downward The two guide posts are correspondingly fitted with the two chutes on the locking ring; an elastic element is disposed between one side of the slider and the outer tube, and the elastic element forces the slider to move toward the opposite side of the two chutes to make the lock The ring shrinks and locks the inner tube; the slider is provided with an unlocking operation button on the outer side of the outer tube.

The relevant content in the above technical solutions is explained as follows:

1. In the above solution, the "locking ring is a cylindrical open ring, which is embedded between the inner tube and the outer tube and is axially positioned and connected with respect to the outer tube" wherein the locking ring is opposite the outer tube in the shaft The upward positioning connection means that the locking ring can be directly positioned on the outer tube or positioned on the outer tube through an intermediate adapter, and the specific positioning connection can be engaged by the card slot.

2. In the above solution, the preferred solution is as follows: The telescopic tube further includes an intermediate sleeve, the intermediate sleeve is embedded between the outer tube and the inner tube, the intermediate sleeve is fixedly connected with the outer tube, and the inner sleeve is provided with a ring on the inner circumferential surface. Positioning groove; the locking ring is embedded in the annular positioning groove, so as to be positioned and connected in the axial direction relative to the outer tube.

Still further, the bottom surface of the intermediate sleeve is provided with a guiding groove on the bottom surface of the corresponding slider, and the bottom of the guiding groove is correspondingly provided with a long hole corresponding to each of the two guiding columns; the bottom of the sliding block is embedded in the guiding groove and the groove With the sliding fit, the guide post on the slider extends downward through the long hole into the chute of the locking ring, thereby guiding the slider through the guiding groove, thereby improving the axial precision of the sliding of the sliding block and avoiding it in sliding Stuck.

3. In the above solution, the locking ring may be a single-layer structure made of nylon or rubber material, but the best solution is that the outer elastic metal layer and the inner friction layer are bonded inside and outside, and the outer elastic metal layer is used. Elastic steel, which provides expansion elasticity and increased fastness. The inner friction layer is made of rubber or nylon to increase friction.

The working principle of the utility model is as follows: as shown in Fig. 1, according to Fig. 2, Fig. 4 and Fig. 5, in a general state, the slider 4 is relatively far away from the two chutes 5 under the action of the compression spring 14. When the side is moved, the two guide posts 6 on the slider 4 cooperate with the two chutes 5 to cause the locking ring 3 to contract tightly and tightly hold the inner tube 1, thereby locking the positioning. The locking ring 3 is axially positioned and connected to the outer tube 2 through the intermediate sleeve 8, because the tube 2 and the inner tube 1 are also kept in a locked state. When the telescopic expansion is required, the unlocking operation button 7 is pushed in the direction of the arrow in FIG. 2, so that the slider 4 moves against the opposite end side of the two chutes 5 against the urging force of the compression spring 14, and the two guide posts on the slider 4 6 cooperates with the two chutes 5 to expand the pin ring 3 to unlock; at this time, the inner tube 1 can be freely retracted from the outer tube 2 or pulled out from the outer tube to adjust the total length of the tube. When the adjustment is in place, the unlocking operation button 7 is released, and the slider 4 is moved to the opposite side of the two chutes 5 by the compression spring 14, so that the locking ring 3 is contracted, and the inner tube is again hung. Locked to achieve stepless length adjustment of the telescopic tube.

Due to the application of the above technical solutions, the utility model has the following advantages compared with the prior art: 1. Since the utility model adopts the locking ring to lock, the adjustment length is stepless adjustment, the degree of expansion and contraction is large, and the position can be locked at any required length position.

2. Since the utility model is locked by the locking ring, the telescopic tube is in a locked state under normal conditions, and needs to be adjusted by pressing the unlocking operation button when the adjustment is needed, and is convenient to use.

3. Because the utility model is locked by the locking ring, it has been proved by experiments that the locking force is greater than 300N, and the locking and unlocking service life can reach more than 10,000 times.

4. Due to the special structure of the utility model, the locking ring is arranged between the inner tube and the outer tube, and the lumen of the telescopic tube remains unobstructed and sealed, thereby meeting the requirements of the vacuum rod of the vacuum cleaner, so that it can It can be used as a lifting support rod or operating rod on mop, camera, clothes fork and other items. It can also be used as a vacuum rod on a vacuum cleaner. It has a wide range of applications.

DRAWINGS

Figure 1 is a schematic exploded view of each component of the present invention;

Figure 2 is a schematic view showing the assembly of the present invention;

Figure 3 is a schematic cross-sectional view of the locking device of the present invention;

Figure 4 is a schematic view showing the function of the locking device of the present invention;

Figure 5 is a cross-sectional view taken along line A-A of Figure 4;

In the above drawings: 1, inner tube; 2, outer tube; 3, locking ring; 4, slider; 5, chute; 6, guide post; 7, unlocking operation button; 8, intermediate sleeve; 10; guiding groove; 11, long hole; 12, outer elastic metal layer; 13, inner friction layer; 14, compression spring; 15, rectangular hole; 16, positioning convex.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

Embodiment: Referring to Figure 1, Figure 2 and Figure 3, a stepless adjustment friction ring locking telescopic tube is composed of an inner tube 1, an outer tube 2, an intermediate sleeve 8 and a locking device. The outer tube 2 - the end portion is a flared end, in which the intermediate sleeve 8 is embedded, the intermediate sleeve 8 and the outer tube 2 are fixedly connected by screws, and the intermediate sleeve 8 is reinserted into the inner tube 1.

Referring to FIG. 1 to FIG. 5, the locking device is composed of a locking ring 3, a slider 4 and a compression spring 14; an inner circumferential surface of the intermediate sleeve 8 is provided with an annular positioning groove 9 in which the locking ring 3 is embedded. 9 , in this way, the outer tube 2 is positioned in the axial direction, and the inner circumferential surface of the locking ring 3 is engaged with the outer circumferential surface of the inner tube; for details, see FIG. 1 , FIG. 4 and FIG. 5 , the locking ring 3 is a cylindrical open ring, the end portions of the two sides of the opening of the locking ring 3 are symmetrically provided with a chute 5, the ends of the two chutes 5 are relatively close to each other, and the other end is relatively far away; the slider 4 corresponds to the locking The opening of the ring 3 is slidably connected to the outer tube 2, and the bottom surface of the slider 4 is provided with two guiding columns 6 downward. The two guiding columns 6 correspond to the two chutes 5 on the locking ring 3. Embed the fit.

Referring to FIG. 1 and FIG. 2, the corresponding slider 4 of the outer tube 2 has an oblong hole 15 for the slider 4 to be embedded, and one side of the oblong hole 15 is provided with a positioning protrusion for the end of the compression spring 14 to be sleeved. 16; a compression spring 14 is disposed between the rear end of the slider 4 and the positioning protrusion 16, and the elastic force of the compression spring 14 forces the slider 4 to move toward the front end toward the opposite end sides of the two chutes 5, and the two on the slider 4 The guide post 6 cooperates with the two chutes 5 to shrink the locking ring 3 to lock the inner tube 1; the slider 4 is provided with an unlocking button on the outer side of the outer tube 2, see FIG. 1, FIG. 2 and FIG. The outer surface of the intermediate sleeve 8 is provided with a guiding groove 10 corresponding to the bottom surface of the slider 4, and the bottom of the guiding groove 10 is correspondingly provided with a long hole 11; the bottom of the slider 4 is embedded in the bottom The guide groove 10 is slidably engaged with the guide groove 10, and the guide post 6 on the slider 4 extends downward through the corresponding long hole 11 into the chute 5 of the lock ring 3.

Referring to Figure 1, Figure 3, and Figure 5, the locking ring 3 is formed by inner and outer bonding of the outer resilient metal layer 12 and the inner friction layer 13. The outer outer elastic metal layer 12 is an elastic steel layer, and the inner friction layer 13 is a rubber layer.

The above embodiments are only intended to illustrate the technical concept and the features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement it, and the scope of the present invention is not limited thereto. Equivalent changes or modifications made in accordance with the spirit of the invention are intended to be included within the scope of the invention.

Claims

杈利3⁄4

1. A steplessly adjustable friction ring locking telescopic tube comprising an inner tube [1], an outer tube [2] and a locking device, the inner tube [1] being internally and externally nested and slidingly connected to the outer tube [2], characterized in that : The locking device is composed of a locking ring [3], a slider [4] and an elastic element; the locking ring [3] is a cylindrical open ring which is embedded between the inner tube [1] and the outer tube [2] And the outer tube [2] is positioned and connected in the axial direction, the inner circumferential surface of the locking ring [3] is in contact with the outer circumferential surface of the inner tube; the end portions of the locking ring [3] are symmetrically provided with a chute [ 5〗, two chutes [5] one end is relatively close, the other end is relatively far away; the slider [4] corresponds to the opening of the locking ring [3], relative to the outer tube [2] sliding connection , the bottom surface of the slider [4] is provided with two guide columns [6] downward, and the two guide columns [6] are correspondingly fitted with the two chutes [5] on the locking ring [3]; the slider [4] An elastic element is arranged between the side and the outer tube [2], and the elastic element forces the slider [4] to move toward the opposite side of the two chutes [5], so that the locking ring [3] shrinks and locks the inner tube [1] ; 4] The upper outer tube [2] has an unlocking operation button [7] on the outside.

2. The stepless adjustable friction ring locking telescopic tube according to claim 1, wherein: the telescopic tube further comprises an intermediate sleeve [8], the intermediate sleeve [8] being embedded in the outer tube [2] and Between the tubes [1], the intermediate sleeve [8] is fixedly connected to the outer tube [2], and the inner sleeve [8] is provided with an annular positioning groove [9] on the inner circumferential surface; the locking ring [3] is embedded in the ring In the positioning groove [9], the outer tube [2] is positioned in the axial direction.

The steplessly adjustable expansion self-locking telescopic tube according to claim 2, wherein: the outer surface of the intermediate sleeve [8] is provided with a guiding four slot [10] corresponding to the bottom surface of the corresponding slider [4], and is guided. The bottom of the groove [10] corresponds to the two guide columns [6] each having a long hole [11]; the bottom of the slider [4] is embedded in the guide groove [10] and is slidingly fitted with the guide four slots [10], the slider [4] The upper guide post [6] extends down to the locking ring via the corresponding long hole [11]

[3] within the chute [5].

4. The steplessly adjustable expansion self-locking telescopic tube according to claim 1, wherein: the locking ring [3] is formed by bonding an outer elastic metal layer [12] and an inner friction layer [13].