Handle telescopic structure and folding cart

Abstract

The utility model discloses a handle telescopic structure and a folding cart, and aims to overcome the defect that handles on a plurality of folding carts used at present can be stretched out and drawn back only after being unlocked by bending down, so that the folding carts are inconvenient to use. The telescopic pipe comprises an inner pipe and an outer pipe, the lower portion of the inner pipe is sleeved with the outer pipe, the outer pipe is connected with the base in a sleeved mode, a connecting base is installed on a bottom plate of the outer pipe, an elastic block and a pressing plate which are movably arranged are installed on the connecting base, a positioning column is arranged on the elastic block, and the positioning column is movably inserted into the base to achieve locking and positioning of the outer pipe and the base. The inner pipe moves downwards to press the pressing plate, and the pressing plate moves to drive the elastic block to move so that the positioning column can be separated from the base. The handle disclosed by the utility model is convenient and quick to stretch and unlock, and brings convenience to the use of the folding cart.

Description

Technical Field

[0001] The utility model relates to a folding cart, and more particularly to a handle telescopic structure and the folding cart. Background Art

[0002] At present, common folding carts are composed of two parts: a frame and a handle. A cloth cover is installed inside the frame. The frame mainly includes wheels, connecting pipes, and plastic parts. The handle is connected to the frame. Pushing and pulling the handle can realize the pushing and pulling operation of the folding cart. In order to facilitate users, many handles can be rotated and extended. However, many handles used now often require bending over to unlock them before they can be extended and retracted, which is inconvenient to use. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings, the utility model provides a handle telescopic structure and a folding stroller. The handle can be telescoped and unlocked conveniently and quickly, which brings convenience to the use of the folding stroller.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a handle telescopic structure, including a base and a telescopic tube, the telescopic tube including an inner tube and an outer tube, the lower part of the inner tube is sleeved in the outer tube, the outer tube is sleeved and connected to the base, the bottom plate of the outer tube is installed with a connecting seat, a movably set spring block and a pressure plate are installed on the connecting seat, a positioning column is provided on the spring block, and the positioning column is movably inserted into the base to realize the locking and positioning of the outer tube and the base, the inner tube moves downward to press the pressure plate, and the movement of the pressure plate drives the spring block to move so that the positioning column is separated from the base.

[0005] The telescopic tube consists of an inner tube and an outer tube that are connected in a sleeve. The inner tube can be extended and retracted up and down to adjust the length of the entire telescopic rod. When using the handle, pull the outer and inner tubes upward, and place the lower end of the outer tube at the base. At this time, the positioning column on the spring block is movably inserted into the base to lock the outer tube and the base. The inner tube moves upward to the appropriate position, and then the handle can be used to push and pull the folding cart. When the telescopic rod retracts, press the inner tube downward, and the lower end of the inner tube moves downward to the lower end of the outer tube. The lower end of the inner tube presses the pressure plate. The movement of the pressure plate drives the spring block to move the positioning column away from the base. Then, the outer and inner tubes move downward together, causing the upper part of the outer tube to slide to the base, and the entire handle is fully retracted. During the entire telescopic process, the user does not need to bend down to unlock, making it easy to use.

[0006] The handle of this patent application is easy and quick to extend and unlock, which brings convenience to the use of the folding stroller.

[0007] Preferably, a preload spring is installed on the connecting seat, and the preload spring abuts against the spring block; an inclined pressing surface is provided on the spring block, and an inclined pushing surface is provided on the pressure plate, and the pushing surface abuts against the pressing surface.

[0008] Under the action of the preload spring, the positioning post on the spring block extends outward and inserts into the base. The preload spring preloads the spring block. When the inner tube pushes the pressure plate downward, the inclined push surface contacts the pressing surface on the spring block, pushing the spring block forward and releasing the positioning post from the base, unlocking the outer tube and allowing it to retract downward.

[0009] Preferably, the pressure plate has an inverted U-shaped structure, a locking protrusion is provided on one side of the pressure plate, a slot is provided on the connecting seat, a slide groove is provided on the side wall of the slot, the lower part of the pressure plate is movably inserted in the slot, and the locking protrusion is movably inserted in the slide groove.

[0010] The pressure plate slides into the slot on the connector, providing stability and reliability. During the lifting and lowering of the pressure plate, the protrusion slides along the slide to prevent the pressure plate from falling out of the slot.

[0011] Preferably, a mounting sleeve is provided on the base, the connecting seat is sleeved in the mounting sleeve, a limit sleeve is inserted into the upper part of the mounting sleeve, the limit sleeve limits the connecting seat, the inner wall of the lower end of the mounting sleeve is inclined outward from top to bottom, a positioning hole is provided on the mounting sleeve, and the positioning column is inserted into the positioning hole.

[0012] The stop sleeve fits between the connecting sleeve and the outer tube, limiting the position of the connecting base and preventing the outer tube from separating upward from the mounting sleeve. As the outer tube is pulled upward, the end of the positioning post contacts the inner wall of the mounting sleeve's lower end. The inclined inner wall of the mounting sleeve acts as a guide, facilitating the retraction of the positioning post. When locked, the positioning post engages the positioning hole in the mounting sleeve, ensuring a secure lock.

[0013] Preferably, the end of the positioning column is tilted downward toward the direction of the elastic block.

[0014] The end of the positioning post is tilted to facilitate the positioning post to slide away from the positioning hole when unlocking.

[0015] Preferably, a locking sleeve is installed at the upper end of the outer tube, and the pull button and the locking block are both installed on the locking sleeve.

[0016] The buckle and locking block are both installed on the locking sleeve, which is easy to assemble and has a reliable connection. This avoids the buckle and locking block being directly installed on the outer tube, which may affect the connection strength of the outer tube.

[0017] Preferably, a limiting plate is installed at the lower part of the inner tube, the limiting plate is attached to the outer wall of the inner tube, and an inner flange is provided on the upper edge of the locking sleeve, and the inner flange limits the limiting plate.

[0018] A limiting piece is installed on the inner tube to prevent the lower part of the inner tube from detaching from the upper part of the outer tube.

[0019] Preferably, an end plug is installed at the lower end of the inner tube, and a handle is installed at the upper end of the inner tube.

[0020] The end plug is installed at the bottom of the inner tube to ensure that the lower end of the inner tube can reliably press the pressure plate. The handle facilitates the push and pull operation of the handle.

[0021] A folding cart comprises a frame, a handle telescopic structure is installed on the frame, a base of the handle telescopic structure is rotatably connected to two connecting rods, ends of the connecting rods are rotatably connected to supports, and the supports are installed on the frame.

[0022] The handle retraction structure is installed on the folding cart. When operating the handle, there is no need to bend over. Just press the inner tube downward to retract it, and pull the inner tube upward to extend it.

[0023] Compared with the prior art, the beneficial effects of the present invention are: (1) the handle of the present patent application is easy and quick to extend and unlock, which brings convenience to the use of the folding stroller; (2) the inner tube and the outer tube are connected in a sleeve manner, and the two will not separate during the telescopic movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the folding cart of the present utility model.

[0025] Figure 2 It is a structural schematic diagram of the handle of the present utility model.

[0026] Figure 3 It is a cross-sectional view of the handle of the present utility model.

[0027] Figure 4 It is a partial cross-sectional view of the connection seat position of the utility model.

[0028] Figure 5 It is a partial cross-sectional view of the buckle connection of the utility model.

[0029] Figure 6 It is a partial exploded view of the connection seat position of the utility model.

[0030] Figure 7 This is a schematic diagram of the connection between the pressure plate and the spring block in Example 2 of the present utility model.

[0031] In the figure: 1. base, 2. telescopic tube, 3. inner tube, 4. outer tube, 5. connecting seat, 6. spring block, 7. pressure plate, 8. positioning column, 9. preload spring, 10. transverse groove, 11. pressing surface, 12. pushing surface, 13. card convex, 14. slot, 15. slide groove, 16. mounting sleeve, 17. limiting sleeve, 18. connecting hole, 19. tongue, 20. positioning hole, 21. buckle, 22. locking block, 23. pushing surface, 24. locking sleeve, 25. connecting ear, 26. connecting head, 27. jack, 28. locking hole, 29. limiting piece, 30. inner flange, 31. end plug, 32. handle, 33. frame, 34. connecting rod, 35. support, 36. fixing seat, 37. slide column, 38. pushing groove. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0033] Example 1: A handle telescopic structure (see attached Figure 1 To the attached Figure 6 ), comprising a base 1 and a telescopic tube 2, the telescopic tube 2 comprising an inner tube 3 and an outer tube 4, the lower portion of the inner tube 3 being sleeved in the outer tube 4, the outer tube 4 being sleeved and connected to the base 1, the inner tube 3 and the outer tube 4 both being non-circular structures, to prevent the inner tube 3 and the outer tube 4 from rotating in the circumferential direction after being sleeved. A connecting seat 5 is installed on the bottom plate of the outer tube 4, the upper portion of the connecting seat 5 being inserted into the bottom of the outer tube 4 and locked by screws, the lower edge of the connecting seat 5 protruding from the outer wall of the outer tube 4. A movably arranged spring block 6 and a pressure plate 7 are installed on the connecting seat 5, a positioning column 8 being provided on the spring block 6, the positioning column 8 being movably inserted into the base 1 to realize locking and positioning of the outer tube 4 and the base 1, the inner tube 3 moves downward to press the pressure plate 7, and the movement of the pressure plate 7 drives the spring block 6 to move so that the positioning column 8 is separated from the base 1.

[0034] A preload spring 9 is installed on the connecting seat 5, and the preload spring 9 abuts against the spring block 6; a transverse groove 10 is provided on the connecting seat 5 and the spring block 6 correspondingly, and the spring block 6 and the preload spring 9 are both installed in the transverse groove 10. The end of the positioning column 8 is tilted from top to bottom toward the spring block 6. A pressing surface 11 tilted from top to bottom toward the positioning column 8 is provided on the spring block 6, and a push surface 12 tilted from top to bottom toward the positioning column 8 is provided on the pressure plate 7. The push surface 12 is provided at the lower end of the pressure plate 7, and the push surface 12 is in contact with the pressing surface 11. Under the action of the preload spring 9, the positioning column 8 on the spring block 6 extends outward and is inserted into the base 1. The preload spring 9 realizes the preload of the spring block 6. After the pressure plate 7 is pressed downward by the inner tube 3, the inclined pushing surface 12 abuts against the pressing surface 11 on the elastic block 6, thereby pushing the elastic block 6 to move, so that the positioning column 8 is separated from the base 1, and the outer tube 4 is unlocked. At this time, the outer tube 4 can move downward and retract.

[0035] The pressure plate 7 has an inverted U-shaped structure, with a latching protrusion 13 on one side of the pressure plate 7. A slot 14 is provided on the connector 5, and a slide groove 15 is provided on the side wall of the slot 14. The lower portion of the pressure plate 7 is movably inserted into the slot 14, and the latching protrusion 13 is movably inserted into the slide groove 15, thereby preventing the pressure plate 7 from being dislodged from the slot 14. The pressure plate 7 slides in the slot 14 on the connector 5, providing a stable and reliable fit. During the lifting and lowering movement of the pressure plate 7, the latching protrusion 13 slides along the slide groove 15, preventing the pressure plate 7 from being dislodged from the slot 14.

[0036] A mounting sleeve 16 is provided on the base 1 and welded to the base 1. The connecting base 5 is inserted into the mounting sleeve 16. A stopper sleeve 17 is inserted into the upper portion of the mounting sleeve 16 to limit the position of the connecting base 5. The stopper sleeve 17 is inserted between the outer tube 4 and the mounting sleeve 16. A snap-fit ​​hole 18 is provided on the side wall of the mounting sleeve 16, and a latch 19 is provided on the stopper sleeve 17. The latch 19 is snap-fitted into the snap-fit ​​hole 18. The lower inner wall of the mounting sleeve 16 is inclined downward and outward. The mounting sleeve 16 is provided with a positioning hole 20, into which the positioning post 8 is inserted. The stopper sleeve 17 is inserted between the connecting sleeve and the outer tube 4, limiting the position of the connecting base 5 and preventing the outer tube 4 from separating upward from the mounting sleeve 16. When the outer tube 4 is pulled upward, the end of the positioning post 8 contacts the lower inner wall of the mounting sleeve 16. The tilted lower inner wall of the mounting sleeve 16 serves as a guide, facilitating the retraction of the positioning post 8. When locked, the positioning column 8 is inserted into the positioning hole 20 on the mounting sleeve 16, and the locking is reliable.

[0037] A toggle button 21 and a locking block 22 are mounted on the upper portion of the outer tube 4. The toggle button 21 is configured to rotate, while the locking block 22 is configured to move. An eccentric push surface 23 is provided on the toggle button 21, and the locking block 22 abuts between the push surface 23 and the outer wall of the inner tube 3. The locking block 22 is T-shaped, with the larger diameter end of the locking block 22 adjacent to the toggle button 21. A locking sleeve 24 is mounted on the upper end of the outer tube 4. A snap-fitting protrusion is provided on the inner wall of the locking sleeve 24, and a snap-fitting slot is provided on the outer tube 4. The snap-fitting protrusion and snap-fitting slot engage to securely connect the locking sleeve 24 to the outer tube 4. Both the toggle button 21 and the locking block 22 are mounted on the locking sleeve 24. Two connecting ears 25 are provided on the outer wall of the locking sleeve 24, and a connecting head 26 is provided at the lower portion of the toggle button 21. The upper portion of the toggle button 21 has an arc-shaped structure, and the connecting head 26 is rotatably connected between the two connecting ears 25. A pushing surface 23 is provided on the connecting head 26. A socket 27 is provided on the locking sleeve 24, and the socket 27 is positioned between the two connecting ears 25. A locking hole 28 is provided on the outer tube 4 corresponding to the socket 27. The small-diameter end of the locking block 22 passes through the socket 27 and the locking hole 28 in sequence. The toggle button 21 is flipped upward to move the pushing surface 23 away from the locking block 22. At this time, the inner tube 3 and the outer tube 4 are unlocked. The toggle button 21 is flipped downward to move the pushing surface 23 closer to and abut against the locking block 22. The inner end of the locking block 22 abuts against the outer wall of the inner tube 3 to achieve the locking and positioning of the inner tube 3 and the outer tube 4.

[0038] A stopper 29 is installed at the bottom of the inner tube 3. The stopper 29 has an arc-shaped structure and fits against the outer wall of the inner tube 3. An inner flange 30 is provided on the upper edge of the locking sleeve 24. The inner flange 30 limits the stopper 29 and prevents the lower portion of the inner tube 3 from escaping from the upper portion of the outer tube 4. An end plug 31 is installed at the lower end of the inner tube 3, and a handle 32 is installed at the upper end of the inner tube 3.

[0039] A foldable stroller includes a foldable frame 33, wheels mounted on the bottom of the frame 33, a telescopic handle structure mounted on the frame 33, a base 1 of the telescopic handle structure rotatably connected to two connecting rods 34, the ends of the connecting rods 34 rotatably connected to supports 35, and the supports 35 are mounted on the frame 33. A fixing base 36 is mounted on the frame 33 corresponding to the supports 35, and the supports 35 are rotatably mounted on the fixing base 36.

[0040] The telescopic tube 2 consists of an inner tube 3 and an outer tube 4, which are connected in a sleeve-like manner. The inner tube 3 can be extended and retracted to adjust the length of the entire telescopic rod. To use the handle, the outer tube 4 and inner tube 3 are pulled upward, positioning the lower end of the outer tube 4 in the position of the base 1. The positioning post 8 on the spring block 6 is then movably inserted into the base 1 to lock the outer tube 4 and the base 1 in place. The inner tube 3 moves upward to the desired position, and the folding stroller can then be pushed or pulled using the handle. To retract the telescopic rod, the inner tube 3 is pressed downward, causing the lower end of the inner tube 3 to move downward to the lower end of the outer tube 4. This lower end of the inner tube 3 presses the pressure plate 7, which moves the spring block 6, disengaging the positioning post 8 from the base 1. The outer tube 4 and inner tube 3 then move downward together, allowing the upper portion of the outer tube 4 to slide back to the base 1, fully retracting the entire handle. The handle retraction mechanism is installed on the folding stroller. To retract the handle, there is no need to bend over; simply press the inner tube 3 downward to retract and pull it upward to extend.

[0041] Example 2: A telescopic handle structure (see attached Figure 1 To the attached Figure 5 , Attachment Figure 7 ), comprising a base 1 and a telescopic tube 2, the telescopic tube 2 comprising an inner tube 3 and an outer tube 4, the lower portion of the inner tube 3 being sleeved in the outer tube 4, the outer tube 4 being sleeved and connected to the base 1, the inner tube 3 and the outer tube 4 both being non-circular structures, to prevent the inner tube 3 and the outer tube 4 from rotating in the circumferential direction after being sleeved. A connecting seat 5 is installed on the bottom plate of the outer tube 4, the upper portion of the connecting seat 5 being inserted into the bottom of the outer tube 4 and locked by screws, the lower edge of the connecting seat 5 protruding from the outer wall of the outer tube 4. A movably arranged spring block 6 and a pressure plate 7 are installed on the connecting seat 5, a positioning column 8 being provided on the spring block 6, the positioning column 8 being movably inserted into the base 1 to realize locking and positioning of the outer tube 4 and the base 1, the inner tube 3 moves downward to press the pressure plate 7, and the movement of the pressure plate 7 drives the spring block 6 to move so that the positioning column 8 is separated from the base 1.

[0042] A preload spring 9 is mounted on the connecting seat 5 and abuts against the spring block 6. Transverse slots 10 are provided on the connecting seat 5 and corresponding to the spring block 6, and both the spring block 6 and the preload spring 9 are mounted in these slots. The end of the positioning post 8 is tilted downward, toward the spring block 6. A sliding post 37 is provided on the spring block 6, and a push groove 38 is provided on the pressure plate 7, tilted downward, toward the positioning post 8. The sliding post 37 and the push groove 38 are movably connected. Under the action of the preload spring 9, the positioning post 8 on the spring block 6 extends outward and is inserted into the base 1. The preload spring 9 preloads the spring block 6. When the pressure plate 7 is pressed downward by the inner tube 3, the sidewalls of the tilted push groove 38 abut against the sliding post 37 on the spring block 6, thereby pushing the spring block 6 to move, causing the positioning post 8 to disengage from the base 1 and unlocking the outer tube 4, which can then move downward and retract.

[0043] The pressure plate 7 has an inverted U-shaped structure, with a latching protrusion 13 on one side of the pressure plate 7. A slot 14 is provided on the connector 5, and a slide groove 15 is provided on the side wall of the slot 14. The lower portion of the pressure plate 7 is movably inserted into the slot 14, and the latching protrusion 13 is movably inserted into the slide groove 15, thereby preventing the pressure plate 7 from being dislodged from the slot 14. The pressure plate 7 slides in the slot 14 on the connector 5, providing a stable and reliable fit. During the lifting and lowering movement of the pressure plate 7, the latching protrusion 13 slides along the slide groove 15, preventing the pressure plate 7 from being dislodged from the slot 14.

[0044] A mounting sleeve 16 is provided on the base 1 and welded to the base 1. The connecting base 5 is inserted into the mounting sleeve 16. A stopper sleeve 17 is inserted into the upper portion of the mounting sleeve 16 to limit the position of the connecting base 5. The stopper sleeve 17 is inserted between the outer tube 4 and the mounting sleeve 16. A snap-fit ​​hole 18 is provided on the side wall of the mounting sleeve 16, and a latch 19 is provided on the stopper sleeve 17. The latch 19 is snap-fitted into the snap-fit ​​hole 18. The lower inner wall of the mounting sleeve 16 is inclined downward and outward. The mounting sleeve 16 is provided with a positioning hole 20, into which the positioning post 8 is inserted. The stopper sleeve 17 is inserted between the connecting sleeve and the outer tube 4, limiting the position of the connecting base 5 and preventing the outer tube 4 from separating upward from the mounting sleeve 16. When the outer tube 4 is pulled upward, the end of the positioning post 8 contacts the lower inner wall of the mounting sleeve 16. The tilted lower inner wall of the mounting sleeve 16 serves as a guide, facilitating the retraction of the positioning post 8. When locked, the positioning column 8 is inserted into the positioning hole 20 on the mounting sleeve 16, and the locking is reliable.

[0045] A toggle button 21 and a locking block 22 are mounted on the upper portion of the outer tube 4. The toggle button 21 is configured to rotate, while the locking block 22 is configured to move. An eccentric push surface 23 is provided on the toggle button 21, and the locking block 22 abuts between the push surface 23 and the outer wall of the inner tube 3. The locking block 22 is T-shaped, with the larger diameter end of the locking block 22 adjacent to the toggle button 21. A locking sleeve 24 is mounted on the upper end of the outer tube 4. A snap-fitting protrusion is provided on the inner wall of the locking sleeve 24, and a snap-fitting slot is provided on the outer tube 4. The snap-fitting protrusion and snap-fitting slot engage to securely connect the locking sleeve 24 to the outer tube 4. Both the toggle button 21 and the locking block 22 are mounted on the locking sleeve 24. Two connecting ears 25 are provided on the outer wall of the locking sleeve 24, and a connecting head 26 is provided at the lower portion of the toggle button 21. The upper portion of the toggle button 21 has an arc-shaped structure, and the connecting head 26 is rotatably connected between the two connecting ears 25. A pushing surface 23 is provided on the connecting head 26. A socket 27 is provided on the locking sleeve 24, and the socket 27 is positioned between the two connecting ears 25. A locking hole 28 is provided on the outer tube 4 corresponding to the socket 27. The small-diameter end of the locking block 22 passes through the socket 27 and the locking hole 28 in sequence. The toggle button 21 is flipped upward to move the pushing surface 23 away from the locking block 22. At this time, the inner tube 3 and the outer tube 4 are unlocked. The toggle button 21 is flipped downward to move the pushing surface 23 closer to and abut against the locking block 22. The inner end of the locking block 22 abuts against the outer wall of the inner tube 3 to achieve the locking and positioning of the inner tube 3 and the outer tube 4.

[0046] A stopper 29 is installed at the bottom of the inner tube 3. The stopper 29 has an arc-shaped structure and fits against the outer wall of the inner tube 3. An inner flange 30 is provided on the upper edge of the locking sleeve 24. The inner flange 30 limits the stopper 29 and prevents the lower portion of the inner tube 3 from escaping from the upper portion of the outer tube 4. An end plug 31 is installed at the lower end of the inner tube 3, and a handle 32 is installed at the upper end of the inner tube 3.

[0047] A foldable stroller includes a foldable frame 33, wheels mounted on the bottom of the frame 33, a telescopic handle structure mounted on the frame 33, a base 1 of the telescopic handle structure rotatably connected to two connecting rods 34, the ends of the connecting rods 34 rotatably connected to supports 35, and the supports 35 are mounted on the frame 33. A fixing base 36 is mounted on the frame 33 corresponding to the supports 35, and the supports 35 are rotatably mounted on the fixing base 36.

[0048] The telescopic tube 2 consists of an inner tube 3 and an outer tube 4, which are connected in a sleeve-like manner. The inner tube 3 can be extended and retracted to adjust the length of the entire telescopic rod. To use the handle, the outer tube 4 and inner tube 3 are pulled upward, positioning the lower end of the outer tube 4 in the position of the base 1. The positioning post 8 on the spring block 6 is then movably inserted into the base 1 to lock the outer tube 4 and the base 1 in place. The inner tube 3 moves upward to the desired position, and the folding stroller can then be pushed or pulled using the handle. To retract the telescopic rod, the inner tube 3 is pressed downward, causing the lower end of the inner tube 3 to move downward to the lower end of the outer tube 4. This lower end of the inner tube 3 presses the pressure plate 7, which moves the spring block 6, disengaging the positioning post 8 from the base 1. The outer tube 4 and inner tube 3 then move downward together, allowing the upper portion of the outer tube 4 to slide back to the base 1, fully retracting the entire handle. The handle retraction mechanism is installed on the folding stroller. To retract the handle, there is no need to bend over; simply press the inner tube 3 downward to retract and pull it upward to extend.

[0049] The above-described embodiments are only preferred solutions of the present invention and do not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A handle telescopic structure, characterized in that: It includes a base and a telescopic tube. The telescopic tube includes an inner tube and an outer tube. The lower part of the inner tube is sleeved in the outer tube. The outer tube is sleeved and connected to the base. A connecting seat is installed on the bottom plate of the outer tube. A movable spring block and a pressure plate are installed on the connecting seat. A positioning column is provided on the spring block. The positioning column is movably inserted into the base to realize the locking and positioning of the outer tube and the base. The inner tube moves downward to press the pressure plate. The movement of the pressure plate drives the spring block to move so that the positioning column is separated from the base.

2. The handle telescopic structure according to claim 1, characterized in that: A preload spring is installed on the connecting seat, and the preload spring abuts against the spring block; an inclined pressing surface is provided on the spring block, and an inclined pushing surface is provided on the pressure plate, and the pushing surface abuts against the pressing surface.

3. The handle telescopic structure according to claim 1, characterized in that: The pressing plate is in an inverted U-shaped structure, with a clamping protrusion on one side of the pressing plate, a slot on the connecting seat, a slide groove on the side wall of the slot, the lower part of the pressing plate is movably inserted in the slot, and the clamping protrusion is movably inserted in the slide groove.

4. The handle telescopic structure according to claim 1, characterized in that: A mounting sleeve is provided on the base, the connecting seat sleeve is installed in the mounting sleeve, a limit sleeve is inserted into the upper part of the mounting sleeve, the limit sleeve limits the connecting seat, the inner wall of the lower end of the mounting sleeve is inclined outward from top to bottom, a positioning hole is provided on the mounting sleeve, and the positioning column is inserted into the positioning hole.

5. The handle telescopic structure according to claim 1, characterized in that: The end of the positioning column is tilted downward toward the direction of the elastic block.

6. The handle telescopic structure according to claim 1, characterized in that: A push button and a locking block are installed on the upper part of the outer tube. The push button is rotated and the locking block is moved. An eccentric pushing surface is provided on the push button, and the locking block abuts between the pushing surface and the outer wall of the inner tube.

7. The handle telescopic structure according to claim 6, characterized in that: A locking sleeve is installed on the upper end of the outer tube, and the pull buckle and the locking block are both installed on the locking sleeve.

8. The handle telescopic structure according to claim 7, characterized in that: A limiting piece is installed at the lower part of the inner tube, and the limiting piece is fitted on the outer wall of the inner tube. An inner flange is provided on the upper edge of the locking sleeve, and the inner flange limits the limiting piece.

9. The handle telescopic structure according to any one of claims 1 to 8, characterized in that: An end plug is installed at the lower end of the inner tube, and a handle is installed at the upper end of the inner tube.

10. A folding cart, characterized in that: The invention comprises a frame, on which the handle telescopic structure according to any one of claims 1 to 9 is installed, the base of the handle telescopic structure is rotatably connected to two connecting rods, the ends of the connecting rods are rotatably connected to supports, and the supports are installed on the frame.

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