Baby carriage handlebar tube telescoping mechanism

Abstract

The utility model discloses a baby carriage handlebar tube telescoping mechanism which comprises a first handle tube, a second handle tube and a third handle tube which are sequentially sleeved, the third handle tube is internally provided with a telescoping mechanism, and the telescoping mechanism comprises a sliding groove rail, a sliding piece, a sliding seat, a groove rail fixing seat and a moving piece. One end of the sliding groove rail is fixed to the groove rail fixing base, the other end of the sliding groove rail is fixed to the first handle pipe, the groove rail fixing base is fixedly connected with the third handle pipe, the sliding part is inserted into the sliding base and arranged outside the sliding groove rail in a sleeving mode, and the moving part sequentially penetrates through the sliding base, the sliding part and the middle of the sliding groove rail. And the support can move up and down. When the baby carriage handle is used, a user can independently push a button with one hand to pull the telescopic mechanism through the telescopic pull rope, the telescopic mechanism drives the first handle pipe to move in the second handle pipe, the second handle pipe can move in the third handle pipe, and therefore the telescopic function of the baby carriage handle is achieved through one-hand operation.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic mechanisms, in particular to a telescopic mechanism for a handlebar tube of a baby carriage. Background Art

[0002] In the present era, baby strollers have become an indispensable tool in the life of families with children aged 0-3 years old. This makes it convenient for families to take children outdoors or use them at home. Therefore, with the continuous improvement of living standards, people have also put forward higher and higher requirements for baby strollers. Baby strollers should not only be comfortable to ride, have stable connections, and reliable structures, but also be able to be folded and contracted for easy carrying.

[0003] The existing Chinese patent number is CN201110154207.0, and the patent name is an invention patent of "baby carriage frame". The patent also has a clamping part in the folding mechanism 90, and the lower end of the rider 10 and the upper end of the front leg 20 are connected through the clamping part to achieve selective pivoting between the two. In this way, the rider 10, the front leg 20 and the bottom frame 30 can pivot with each other to achieve the folding or opening of the baby carriage frame; the rider 10 is also provided with a folding handle 110, and the folding handle 110 is connected to the clamping part and is used to release the rider 10. Preferably, the rider 10 can also be designed as a telescopic structure, so that the volume of the frame can be further reduced when it is folded. The designs of the folding mechanism 90 and the clamping part of the baby carriage frame of the present invention are well known to ordinary technicians in the field, and will not be described in detail here. Although this patent can realize the extension and retraction of the handle of the baby stroller, it requires both hands to pull the folding handle at the same time to operate it, which brings certain inconvenience to the user. Utility Model Content

[0004] The purpose of the utility model is to provide a retractable mechanism for the handlebar tube of a baby stroller, aiming to solve the above-mentioned technical problems. When the utility model is used, the user presses a button with one hand to pull the retractable mechanism through a retractable pull rope, so that the retractable mechanism drives the first handle tube to move in the second handle tube, and the second handle tube can move in the third handle tube, thereby realizing the retractable function of the baby stroller handle by single-handed operation.

[0005] The invention relates to a telescopic mechanism for a handlebar tube of a baby stroller, comprising a first handlebar tube, a second handlebar tube, a third handlebar tube and a telescopic mechanism, wherein the rear portion of the first handlebar tube can be movably inserted in the front interior of the second handlebar tube, the rear portion of the second handlebar tube can be movably inserted in the front interior of the third handlebar tube, the telescopic mechanism is arranged in the interior of the third handlebar tube, one end of the telescopic mechanism is fixedly connected to the third handlebar tube, and the other end is fixedly connected to the first handlebar tube, and can drive the first handlebar tube to move in the second handlebar tube, the telescopic mechanism comprises a sliding groove, a sliding member, a sliding seat, a groove rail fixing seat and a moving member, the sliding groove is arranged in the third handlebar tube portion, one end of the sliding groove is fixed on the groove rail fixing seat, the groove rail fixing seat is fixedly connected to the third handlebar tube, the other end of the sliding groove is detachably fixedly connected to the first handlebar tube via a fixing pin, the sliding member is inserted in the sliding seat, and is sleeved on the outside of the sliding groove, the moving member passes through the sliding seat, the sliding member and the middle portion of the sliding groove in sequence, and can move up and down.

[0006] Preferably, the bottom surface of the sliding rail is provided with a plurality of sliding rail limiting grooves with bottom openings, and both ends of the sliding rail are provided with rail fixing holes.

[0007] Preferably, a sliding member fitting groove is provided on the upper portion of the sliding member, the sliding member fitting groove connects the left and right end faces of the sliding member, a sliding member slide groove is provided in the middle portion of the sliding member, the sliding member slide groove connects the front and rear end faces of the sliding member, the movable member is inserted in the sliding member slide groove, a pull rope fixing hole is provided below the sliding member slide groove, and a protruding reset spring mounting column is provided on the right end face of the sliding member corresponding to the pull rope fixing hole.

[0008] Preferably, the sliding member chute comprises an upper ramp, a parallel track and a lower ramp which are arranged in sequence, the upper ramp and the lower ramp have the same inclination angle, and the angle between the center line of the upper ramp and the lower ramp and the horizontal line ranges from 30° to 60°.

[0009] Preferably, a return spring is sleeved on the return spring mounting column, one end of the return spring is sleeved on the return spring mounting column, and the other end is abutted against the inside of the sliding seat.

[0010] Preferably, a sliding seat fitting groove is provided on the upper portion of the sliding seat, and the sliding seat fitting groove is connected to the left and right end surfaces of the sliding seat. A sliding seat slide groove is provided in the middle portion of the sliding seat, and the sliding seat slide groove is in a vertical "0" shape and is connected to the front and rear end surfaces of the sliding seat. The movable part is inserted in the sliding seat slide groove, and a sliding seat pin hole is also provided on the sliding seat. The fixing pin is inserted in the sliding seat pin hole and enables the sliding seat to form a detachable fixed connection with the first handle tube.

[0011] Preferably, a fixing seat groove rail fixing groove is provided at the upper front end of the groove rail fixing seat, and a buffer component installation groove is provided at the lower front end, and a movable buffer limit component is provided in the buffer component installation groove, and the end of the sliding groove rail passes through the upper part of the buffer limit component and is inserted into the fixing seat groove rail fixing groove, and the sliding groove rail, the groove rail fixing seat and the third handle tube are fixedly connected through the fixing component.

[0012] Preferably, a buffer spring is provided on the bottom surface of the buffer limiter, one end of the buffer spring is sleeved on the spring mounting column of the buffer limiter, and the other end is sleeved on the spring mounting column on the bottom surface of the groove rail fixing seat.

[0013] Preferably, a first handle tube sleeve is provided inside the front end of the second handle tube, the first handle tube sleeve is located between the inner side of the front end of the second handle tube and the outer side of the end of the third handle tube, a protruding buckle is provided on the outside of the first handle tube sleeve, a buckle hole is provided at the front of the second handle tube, the buckle of the first handle tube sleeve is clamped in the buckle hole of the second handle tube, and can drive the second handle tube to move.

[0014] Preferably, a second handle tube sleeve is provided inside the front end of the first handle tube, and the second handle tube sleeve is located between the outer side of the end of the second handle tube and the inner side of the front end of the first handle tube.

[0015] The utility model of the baby stroller handlebar tube telescopic mechanism has the following beneficial effects:

[0016] 1. The utility model of the baby stroller handlebar tube telescopic mechanism mainly includes a sliding groove rail, a sliding member, a sliding seat, a groove rail fixing seat and a moving member. It has few components and a simple structure, so it is easy to install;

[0017] 2. The handlebar extension mechanism of the baby stroller of the utility model is connected with a button device operated by one hand. The button operated by one hand can be pulled to extend and retract, thereby pulling the sliding member, so that the sliding member overcomes the spring force and moves forward, so that the moving member can move down along the sliding groove of the sliding member, thereby releasing the restriction on the sliding rail, and under the action of the driving force, the first handlebar can be extended and retracted in the second handlebar. When the first handlebar is clamped in the second handlebar, under the continuous action of the driving force, the first handlebar can drive the second handlebar to extend and retract in the third handlebar, thereby realizing the extension and retraction of the handlebars controlled by one hand, which is convenient for users to use;

[0018] 3. The slide rail is provided with a plurality of slide rail limit grooves, and the extension length of the handlebar can be freely adjusted according to the needs, so that the user can adjust the length of the handlebar conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the overall structure of the telescopic mechanism of the handlebar tube of the baby stroller of the utility model;

[0020] Figure 2 It is a schematic diagram of the telescopic mechanism of the handlebar tube telescopic mechanism of the baby stroller of the utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the sliding member of the telescopic mechanism of the handlebar tube of the baby stroller of the utility model;

[0022] Figure 4 It is a schematic diagram of the sliding seat structure of the handlebar tube telescopic mechanism of the baby stroller of the utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the groove rail fixing seat of the telescopic mechanism of the handlebar tube of the baby stroller of the utility model;

[0024] Numbers: 1. Sliding groove; 101. Slide rail limiting groove; 102. Slide rail fixing hole; 2. Sliding part; 201. Slide part set groove; 202. Slide part slide groove; 2021. Upper ramp; 2022. Parallel road; 2023. Lower ramp; 203. Reset spring mounting column; 204. Pull rope fixing hole; 3. Sliding seat; 301. Slide seat set groove; 302. Sliding seat slide groove; 303. Sliding seat pin hole; 4. Slide rail fixing seat; 401. Fixed seat slide rail fixing groove; 402. Buffer part mounting groove; 5. Moving part; 6. Reset spring; 7. Fixed pin; 8. Buffer limiting part; 9. Buffer spring; 10. First handle tube; 11. Second handle tube; 12. Third handle tube; 13. First handle tube sleeve; 14. Second handle tube sleeve; 15. One-hand operation button. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with embodiments and drawings.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element; when an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] like Figure 1 and Figure 2 As shown, a handlebar extension mechanism for a baby stroller includes a first handlebar 10, a second handlebar 11, a third handlebar 12 and an extension mechanism. The rear portion of the first handlebar 10 can be movably inserted in the front interior of the second handlebar 11, the rear portion of the second handlebar 11 can be movably inserted in the front interior of the third handlebar 12, the extension mechanism is arranged in the interior of the third handlebar 12, one end of the extension mechanism is fixedly connected to the third handlebar 12, and the other end is fixedly connected to the first handlebar 10, and can drive the first handlebar 10 to move in the second handlebar 11. The telescopic mechanism includes a sliding groove 1, a sliding member 2, a sliding seat 3, a groove fixing seat 4 and a moving member 5. The sliding groove 1 is arranged on the third handle tube 12, and one end of the sliding groove 1 is fixed on the groove fixing seat 4. The groove fixing seat 4 is fixedly connected to the third handle tube 12. The other end of the sliding groove 1 is detachably fixedly connected to the first handle tube 10 through a fixing pin 7. The sliding member 2 is inserted into the sliding seat 3 and sleeved on the outside of the sliding groove 1. The moving member 5 passes through the sliding seat 3, the sliding member 2 and the middle of the sliding groove 1 in sequence, and can move up and down.

[0029] It should be noted that: in the present embodiment, the one-hand operation button 15 is installed inside the upper horizontal part of the first handle tube 10, and is connected to the telescopic mechanism through a telescopic pull rope, so that the user can pull the telescopic mechanism through the one-hand operation button 15, one end of the telescopic pull rope is connected to the one-hand operation button 15, and the other end is connected to the sliding member 2, and can pull the sliding member 2. When the user pulls the telescopic pull rope through the one-hand operation button 15, the telescopic pull rope can pull the sliding member 2 to overcome the spring force and move toward the first handle tube 10. At this time, the moving member 5 inserted in the middle of the sliding member 2 can move downward along the direction of the sliding member slide groove 201 of the sliding member 2, thereby allowing the moving member 5 to break away from the restriction of the slide rail limit groove 101. In this way, the sliding member 2 can drive the sliding seat 3 to move forward and backward on the slide groove rail 1, and then drive the first handle tube 10 to move in the second handle tube 11. When the first handle tube 10 extends into the innermost part of the second handle tube 11, The first handle tube 10 will drive the second handle tube 11 to perform telescopic movement in the third handle tube 12 through the first handle tube sleeve 13; when the one-hand operation button 15 is released, the telescopic pull rope loses the pulling force, and the sliding member 2 is reset and moved backward under the action of the reset spring 6, so that the moving member 5 moves along the sliding member sliding groove 201 of the sliding member 2, and then moves into the sliding rail limiting groove 101 of the sliding groove rail 1, and the movement of the moving member 5 is limited by the joint clamping action of the sliding rail limiting groove 101 and the sliding member 2, so that the function of telescopic adjustment of the handlebar can be achieved by single-handed operation.

[0030] like Figure 2 As shown, the bottom surface of the sliding rail 1 is provided with a plurality of sliding rail limiting grooves 101 with bottom openings, and both ends of the sliding rail 1 are provided with rail fixing holes 102.

[0031] It should be noted that: in the present embodiment, the movable member 5 is clamped in the slide rail limiting groove 101, and fixing pins 7 are inserted into the rail fixing holes 102 at the front and rear ends of the slide rail 1. The front end of the slide rail 1 forms a detachable fixed connection with the first handle tube 10 through the fixing pin 7, and the rear end of the slide rail 1 forms a detachable fixed connection with the third handle tube 12 through the fixing pin 7.

[0032] like Figure 2 , Figure 3 and Figure 4As shown, the upper part of the sliding member 2 is provided with a sliding member set groove 201, the sliding member set groove 201 is connected to the left and right end faces of the sliding member 2, the middle part of the sliding member 2 is provided with a sliding member slide groove 202, the sliding member slide groove 202 is connected to the front and rear end faces of the sliding member 2, the moving member 5 is inserted in the sliding member slide groove 202, the lower part of the sliding member slide groove 202 is provided with a pull rope fixing hole 204, and the pull rope fixing hole 204 is provided with a protruding reset spring mounting column 203 on the right end face of the sliding member 2. The sliding member slide groove 202 includes an upper ramp 2021, a parallel path 2022 and a lower ramp 2023 which are arranged in sequence, the upper ramp 2021 and the lower ramp 2023 have the same inclination angle, and the angle between the center line of the upper ramp 2021 and the lower ramp 2023 and the horizontal line ranges from 30° to 60°. The return spring mounting column 203 is sleeved with a return spring 6, one end of the return spring 6 is sleeved on the return spring mounting column 203, and the other end is abutted against the inside of the sliding seat 3. The upper part of the sliding seat 3 is provided with a sliding seat sleeve groove 301, and the sliding seat sleeve groove 301 is connected to the left and right end surfaces of the sliding seat 3. The middle part of the sliding seat 3 is provided with a sliding seat slide groove 302, and the sliding seat slide groove 302 is in a vertical "0" shape and connects the front and rear end surfaces of the sliding seat 3. The moving member 5 is inserted in the sliding seat slide groove 302. The sliding seat 3 is also provided with a sliding seat pin hole 303. The fixing pin 7 is inserted in the sliding seat pin hole 303 and enables the sliding seat 3 to form a detachable fixed connection with the first handle tube 10.

[0033] It should be noted that: in this embodiment, the sliding member 2 is inserted into the sliding seat 3, and the sliding member set groove 201 of the sliding member 2 and the sliding seat set groove 301 of the sliding seat 3 are overlapped inside and outside, so that the sliding groove rail 1 can pass through the sliding seat set groove 301 while also passing through the sliding member set groove 201. At this time, the sliding seat groove 302 can be set exactly corresponding to the sliding seat groove 302, and the sliding member groove 202 can also be set exactly corresponding to one of the slide rail limit grooves 101. The arrangement allows the moving part 5 to pass through the sliding seat slot 302, the sliding seat slot 302 and the slide rail limit slot 101 in sequence; the three-section design of the sliding member slot 202 allows the sliding member 2 to drive the moving part 5 to move up and down along the direction of the sliding member slot 202 during the movement; in this embodiment, the angle between the center line of the upper ramp 2021 and the lower ramp 2023 and the horizontal line is 45°; the telescopic pull rope passes through the sliding seat 3 and is fixed in the pull rope fixing hole 204 of the sliding member 2.

[0034] like Figure 2 and Figure 5As shown, the front upper part of the groove rail fixing seat 4 is provided with a fixing seat groove rail fixing groove 401, and the front lower part is provided with a buffer component installation groove 402, and a movable buffer stopper 8 is provided in the buffer component installation groove 402, and the end of the sliding groove rail 1 passes through the upper part of the buffer stopper 8 and is inserted into the fixing seat groove rail fixing groove 401, and the sliding groove rail 1, the groove rail fixing seat 4 and the third handle pipe 12 are fixedly connected through the fixing component. The bottom surface of the buffer stopper 8 is provided with a buffer spring 9, one end of the buffer spring 9 is sleeved on the spring installation column of the buffer stopper 8, and the other end is sleeved on the spring installation column on the bottom surface of the groove rail fixing seat 4.

[0035] It should be noted that: the end of the sliding groove rail 1 is inserted into the fixing groove 401 of the fixing seat groove rail and fixed by a fixing piece. The groove rail fixing seat 4 is fixedly connected with the third handlebar tube 12 by screws or fixing pins. The buffer limiter 8 is inserted into the buffer member mounting groove 402 to prevent the sliding seat 3 from directly colliding with the groove rail fixing seat 4.

[0036] like Figure 1 As shown, a first handle sleeve 13 is provided inside the front end of the second handle tube 11, and the first handle sleeve 13 is located between the inner side of the front end of the second handle tube 11 and the outer side of the end of the third handle tube 12. A protruding buckle is provided outside the first handle sleeve 13, and a buckle hole is provided at the front of the second handle tube 11. The buckle of the first handle sleeve 13 is clamped in the buckle hole of the second handle tube 11 and can drive the second handle tube 11 to move. A second handle sleeve 14 is provided inside the front end of the first handle tube 10, and the second handle sleeve 14 is located between the outer side of the end of the second handle tube 11 and the inner side of the front end of the first handle tube 10.

[0037] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any technician familiar with the profession can make some changes, modifications and equivalent changes made by using the technical content disclosed above without departing from the scope of the technical solution of the utility model, which are all equivalent embodiments of the utility model. At the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A baby stroller handlebar tube telescopic mechanism, comprising a first handlebar tube (10), a second handlebar tube (11), a third handlebar tube (12) and a telescopic mechanism, wherein the rear portion of the first handlebar tube (10) is movably inserted into the front interior of the second handlebar tube (11), the rear portion of the second handlebar tube (11) is movably inserted into the front interior of the third handlebar tube (12), the telescopic mechanism is arranged inside the third handlebar tube (12), one end of the telescopic mechanism is fixedly connected to the third handlebar tube (12), and the other end is fixedly connected to the first handlebar tube (10), and can drive the first handlebar tube (10) to move inside the second handlebar tube (11), characterized in that: The telescopic mechanism comprises a sliding groove rail (1), a sliding member (2), a sliding seat (3), a groove rail fixing seat (4) and a moving member (5); the sliding groove rail (1) is arranged on the third handle tube (12), one end of which is fixed on the groove rail fixing seat (4); the groove rail fixing seat (4) is fixedly connected to the third handle tube (12); the other end of the sliding groove rail (1) is detachably fixedly connected to the first handle tube (10) via a fixing pin (7); the sliding member (2) is inserted into the sliding seat (3) and sleeved on the outside of the sliding groove rail (1); the moving member (5) passes through the sliding seat (3), the sliding member (2) and the middle of the sliding groove rail (1) in sequence and can move up and down.

2. The baby stroller handlebar tube telescopic mechanism according to claim 1, characterized in that: The bottom surface of the sliding rail (1) is provided with a plurality of sliding rail limiting grooves (101) with bottom openings, and both ends of the sliding rail (1) are provided with rail fixing holes (102).

3. The baby stroller handlebar tube telescopic mechanism according to claim 1, characterized in that: The upper part of the sliding member (2) is provided with a sliding member sleeve groove (201), and the sliding member sleeve groove (201) is connected to the left and right end faces of the sliding member (2). The middle part of the sliding member (2) is provided with a sliding member slide groove (202), and the sliding member slide groove (202) is connected to the front and rear end faces of the sliding member (2). The moving member (5) is inserted into the sliding member slide groove (202), and a pull rope fixing hole (204) is provided below the sliding member slide groove (202). The pull rope fixing hole (204) is provided with a protruding reset spring mounting column (203) corresponding to the right end face of the sliding member (2).

4. The baby stroller handlebar tube telescopic mechanism according to claim 3, characterized in that: The sliding member chute (202) comprises an upper ramp (2021), a parallel path (2022) and a lower ramp (2023) which are arranged in sequence, the upper ramp (2021) and the lower ramp (2023) have the same inclination angle, and the angle between the center line of the upper ramp (2021) and the lower ramp (2023) and the horizontal line ranges from 30° to 60°.

5. The baby stroller handlebar tube telescopic mechanism according to claim 4, characterized in that: A return spring (6) is sleeved on the return spring mounting column (203); one end of the return spring (6) is sleeved on the return spring mounting column (203), and the other end is abutted against the inside of the sliding seat (3).

6. The baby stroller handlebar tube telescopic mechanism according to claim 1, characterized in that: The upper part of the sliding seat (3) is provided with a sliding seat sleeve groove (301), the sliding seat sleeve groove (301) is connected to the left and right end surfaces of the sliding seat (3), the middle part of the sliding seat (3) is provided with a sliding seat slide groove (302), the sliding seat slide groove (302) is in a vertical "0" shape, and is connected to the front and rear end surfaces of the sliding seat (3), the moving member (5) is inserted into the sliding seat slide groove (302), the sliding seat (3) is also provided with a sliding seat pin hole (303), the fixing pin (7) is inserted into the sliding seat pin hole (303) and enables the sliding seat (3) to form a detachable fixed connection with the first handle tube (10).

7. The baby stroller handlebar tube telescopic mechanism according to claim 1, characterized in that: The front upper portion of the groove rail fixing seat (4) is provided with a fixing seat groove rail fixing groove (401), and the front lower portion is provided with a buffer component installation groove (402). A movable buffer stopper (8) is provided in the buffer component installation groove (402). The end of the sliding groove rail (1) passes through the upper portion of the buffer stopper (8) and is inserted into the fixing seat groove rail fixing groove (401), and the sliding groove rail (1), the groove rail fixing seat (4) and the third handle tube (12) are fixedly connected by the fixing component.

8. The baby stroller handlebar tube telescopic mechanism according to claim 7, characterized in that: A buffer spring (9) is provided on the bottom surface of the buffer limiter (8), one end of the buffer spring (9) is sleeved on the spring mounting column of the buffer limiter (8), and the other end is sleeved on the spring mounting column on the bottom surface of the groove rail fixing seat (4).

9. The baby stroller handlebar tube telescopic mechanism according to claim 1, characterized in that: A first handle tube sleeve (13) is provided inside the front end of the second handle tube (11), the first handle tube sleeve (13) is located between the inner side of the front end of the second handle tube (11) and the outer side of the end of the third handle tube (12), a protruding buckle is provided outside the first handle tube sleeve (13), a buckle hole is provided at the front of the second handle tube (11), the buckle of the first handle tube sleeve (13) is buckled in the buckle hole of the second handle tube (11), and can drive the second handle tube (11) to move.

10. The baby stroller handlebar tube telescopic mechanism according to claim 1, characterized in that: A second handle tube sleeve (14) is provided inside the front end of the first handle tube (10), and the second handle tube sleeve (14) is located between the outer side of the end of the second handle tube (11) and the inner side of the front end of the first handle tube (10).

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