A bi-directional telescopic paint pole with over extension protection

Abstract

The present application relates to a kind of two-way telescopic paint rod with elongation over-position protection, it includes mounting seat, center support tube, end rod, rear pipe sleeve, transmission mechanism and locking mechanism, it also includes over-position protection mechanism, over-position protection mechanism includes fixed support, movable support and first spring, fixed support is located at the bottom of center support tube, sliding slot is opened on the outer peripheral wall of center support tube, movable support is located inside center support tube, and it is opposite with fixed support, first spring is located between fixed support and movable support, sliding block is formed on movable support corresponding sliding slot, sliding block passes through sliding slot outward, and with sliding slot sliding fit, the inner wall of rear pipe sleeve has upper step position, upper step position is opposite with sliding block.This technical solution has elongation over-position protection mechanism, so that when inner pipe sleeve and outer tube move away from each other close to maximum stroke, further continuous movement can be prevented, and prompted by providing tactile feedback.

Description

Technical Field

[0001] This utility model relates to the field of painting tool technology, and more specifically to a bidirectional telescopic paint rod with overextension protection. Background Technology

[0002] A paint rod is a handheld painting tool used to connect paintbrushes, paint rollers, paint scrapers, and other painting and repair tools. This increases the distance between the painting and repair tools and the operator's hands, making it easier for the operator to lift the tool to a high position on the wall for painting and repair work.

[0003] Telescopic paint rods are a new type of paint rod. Their main advantage over fixed-length paint rods lies in their flexible adjustability. By freely extending and retracting their length, they can adapt to different work height requirements. Simultaneously, they save space when retracted, facilitating storage and transportation. To enable ultra-high-level painting and repair work, Chinese patent CN219261641U discloses a bidirectional telescopic paint rod. It includes a support sleeve, an outer sleeve, an inner sleeve, a transmission mechanism, and a locking mechanism. The outer sleeve is fitted over the support sleeve, and the inner sleeve is inserted into the support sleeve, with one end extending beyond the support sleeve for connecting wall painting and repair tools. The transmission mechanism is located on the support sleeve and connects... The outer and inner sleeves are connected. When the transmission mechanism is in operation, it drives the outer and inner sleeves to move synchronously in opposite directions along the axial direction of the supporting sleeve. The transmission includes a transmission wheel and a transmission belt. The transmission wheel is located on the supporting sleeve, and the transmission belt is wound around the transmission wheel. One end of the belt is located outside the supporting sleeve and connected to the outer sleeve, while the other end passes through the supporting sleeve and connects to the inner sleeve. When the rod extends, the inner sleeve moves continuously towards the outside of the supporting sleeve, pulling the transmission belt in that direction. At this time, the height difference between the two ends of the transmission belt changes, which in turn pulls the outer sleeve to move synchronously in the direction away from the inner sleeve, realizing the bidirectional extension and retraction of the rod, thus allowing ultra-high-level painting and repair operations.

[0004] The telescopic travel range of the telescopic paint rod is fixed. The aforementioned bidirectional telescopic paint rod lacks over-extension protection. When the inner or outer sleeve is pulled to move in opposite directions to the maximum travel, if the pulling force is still applied, it is very easy to cause the transmission skin end to loosen or even break due to excessive stress, resulting in damage to the transmission mechanism and failure of the bidirectional telescopic function. Utility Model Content

[0005] In response to the above situation, and to overcome the problem that existing bidirectional telescopic paint rods lack over-extension protection, and if the inner and outer sleeves continue to be stretched after moving in opposite directions to their maximum stroke, the transmission skin end is easily loosened or even broken due to excessive stress, resulting in damage to the transmission mechanism and failure of the bidirectional telescopic function, the purpose of this utility model is to provide a bidirectional telescopic paint rod with an over-extension protection mechanism, so as to prevent further continuous movement when the inner and outer sleeves move in opposite directions to approach the maximum stroke, and to provide tactile feedback as a reminder.

[0006] To achieve the above objectives, the technical solution of this utility model is:

[0007] A bidirectional telescopic paint rod with over-extension protection includes a mounting base, a central support tube, an end rod, a rear sleeve, a transmission mechanism, and a locking mechanism. The upper end of the central support tube is fixed in the mounting base, and the lower end is inserted into the rear sleeve. The end rod is inserted into the central support tube. The transmission mechanism is located on the central support tube and connects the end rod and the rear sleeve. The locking mechanism is located on the mounting base and locks with the end rod. It also includes an over-extension protection mechanism, which includes a fixed support, a movable support, and a first spring. The fixed support is located at the bottom of the central support tube, and a groove is formed on the outer peripheral wall of the central support tube. The movable support is located inside the central support tube and is opposite to the fixed support. The first spring is located between the fixed support and the movable support. A slider is formed on the movable support corresponding to the groove. The slider passes outward through the groove and slides with the groove. The inner wall of the rear sleeve has an upper step position, which is opposite to the slider.

[0008] Preferably, the fixed support and the movable support each have a fixed guide post and a movable guide post, with the fixed guide post and the movable guide post facing each other, and the two ends of the first spring respectively sleeved on the fixed guide post and the movable guide post.

[0009] Preferably, the rear tube sleeve includes a tube body, an upper tube cap, and a lower tube cap, with the upper and lower tube caps respectively located at the upper and lower ends of the tube body. A stop block is formed on the inner wall of the upper tube cap, and an upper step is formed between the stop block and the inner wall of the tube body.

[0010] Preferably, a wing plate is formed on the slider, and a step is formed between the wing plate and the outer wall of the central support tube.

[0011] Preferably, the transmission mechanism includes a transmission wheel and a transmission belt. A wheel cavity is provided in the fixed support, and the transmission wheel is hinged in the wheel cavity. The outer wall of the fixed support is also provided with a belt inlet and a belt outlet that communicate with the wheel cavity. The belt inlet communicates with the interior of the central support tube, and the belt outlet communicates with the interior of the rear tube sleeve. One end of the transmission belt is connected to the end rod, and the other end passes through the belt inlet, the wheel cavity and the belt outlet in sequence, and is connected to the rear tube sleeve. The transmission belt is wound around the transmission wheel.

[0012] Preferably, both ends of the transmission belt are fixed to the rear sleeve and the end rod respectively by positioning bolts.

[0013] Preferably, it also includes a steel strip ruler, which is mounted on the end rod. The steel strip ruler has locking holes sequentially opened along its length, and the locking mechanism cooperates with any of the locking holes to lock the end rod.

[0014] Preferably, the locking mechanism includes a locking button, a second spring, and a locking sleeve. An outer mounting groove is provided on the outer side wall of the mounting base, and an inner mounting groove is provided on the inner side wall. A locking channel connecting the outer mounting groove and the inner mounting groove is also provided. The locking button and the locking sleeve are respectively located in the outer mounting groove and the inner mounting groove. The locking sleeve is fitted onto the end rod and can move up and down in the inner mounting groove and relative to the end rod. The inner ring of the locking sleeve has a locking tongue that is inserted into any lock hole. The locking button has a guide rod that passes through the locking channel and connects to the locking sleeve. The second spring is fitted onto the locking button, and its two ends abut against the bottom of the locking button and the outer mounting groove, respectively.

[0015] Preferably, a fitting groove is provided on the outer wall of the end rod along the length direction, and a side groove is provided on the left and right side walls of the fitting groove. The steel strip ruler is embedded in the fitting groove, and its left and right sides cooperate with the side groove.

[0016] Preferably, the inner wall of the rear sleeve is provided with a guide protrusion in a ring shape, and the outer peripheral wall of the fixed support is provided with a corresponding guide groove, which slides in conjunction with the guide protrusion.

[0017] Preferably, the upper end of the end rod is provided with a threaded connection seat.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] When the extension stroke of the paint rod of this utility model approaches its maximum range, that is, when the rear tube sleeve moves downward along the central support tube to near its maximum stroke, the upper step of its inner wall will abut against the lower step formed between the slider and the outer wall of the central support tube, forming a stepped engagement. As the rear tube sleeve moves further, it will push the slider and the entire movable support to move along the slide groove and compress the first spring. When the slider abuts against the end of the slide groove, it will limit the movable support, preventing it from moving further downward, thereby preventing the movement of the rear tube sleeve and the end rod connected through the transmission mechanism, forming over-extension protection, preventing excessive extension and damage to the transmission mechanism, and ensuring that the bidirectional extension function works normally. At the same time, the elastic force generated when the first spring is compressed will also be converted into a continuous resistance to prevent the rear tube sleeve from moving downward, and provide tactile feedback to the user, reminding the user that the extension stroke is close to the maximum range. After the control applied to the rear tube sleeve is removed, the first spring will restore its deformation and drive the movable support to reset. In this way, the rear tube sleeve and the end rod can be moved back a certain distance through the movable support, ensuring that the length of the entire paint rod remains within the allowable extension range. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the paint rod of this utility model in its initial state;

[0021] Figure 2 This is a schematic diagram of the overall structure of the paint rod after bidirectional extension;

[0022] Figure 3 This is a cross-sectional structural diagram of the paint rod of this utility model from a first-view perspective in its initial state;

[0023] Figure 4 This is a utility model Figure 3 A magnified structural diagram of part A;

[0024] Figure 5 This is a utility model Figure 3 A schematic diagram of the enlarged structure of part B;

[0025] Figure 6 This is a partial structural diagram of the central support tube of the paint rod of this utility model connected to the movable support;

[0026] Figure 7 This is a schematic diagram of the disassembled structure of the paint rod rear sleeve of this utility model;

[0027] Figure 8 This is a partial structural diagram of the fixed support for the paint rod connected to the transmission belt according to this utility model;

[0028] Figure 9 This is a cross-sectional structural diagram of the paint rod of this utility model from a second perspective in its initial state;

[0029] Figure 10 This is a utility model Figure 9 A magnified structural diagram of section C;

[0030] Figure 11 This is a utility model Figure 9 A schematic diagram of the enlarged structure of part D;

[0031] Figure 12 This is a cross-sectional structural diagram of the paint rod of this utility model in its initial state from a third-person perspective;

[0032] Figure 13 This is a partial structural diagram of the paint rod of this utility model in its initial state, after the mounting base has been removed;

[0033] Figure 14 This is a utility model Figure 13 A magnified structural diagram of part E;

[0034] Figure 15 This is a partial structural diagram of the paint rod of this utility model connected to the end rod with a steel ruler.

[0035] As shown in the figure:

[0036] 1. Mounting base; 101. External mounting groove; 102. Internal mounting groove; 103. Locking channel; 2. Central support tube; 201. Slide groove; 3. End rod; 301. Fitting groove; 302. Side groove; 4. Rear tube sleeve; 401. Tube body; 401a. Guide protrusion; 402. Upper tube cap; 402a. Stop block; 402b. Upper step position; 403. Lower tube cap; 5. Transmission mechanism; 501. Transmission wheel; 502. Transmission belt; 6. Locking mechanism; 601. Locking button; 601a. ​​Guide rod 602. Second spring; 603. Lock sleeve; 603a. Lock tongue; 7. Over-position protection mechanism; 701. Fixed support; 701a. Fixed guide post; 701b. Wheel cavity; 701c. Belt inlet; 701d. Belt outlet; 701e. Guide groove; 702. Movable support; 702a. Slider; 702b. Lower step position; 702c. Movable guide post; 702d. Wing plate; 703. First spring; 8. Positioning bolt; 9. Steel strip ruler; 901. Lock hole; 10. Threaded connection seat. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the purpose of simplifying the description and do not indicate or imply that the orientation is a specific orientation or specific orientation structure and operation. Therefore, they should not be construed as limiting this utility model.

[0039] like Figures 1 to 7As shown, this utility model relates to a bidirectional telescopic paint rod with overextension protection. Similar to existing bidirectional telescopic paint rods, it includes a mounting base 1, a central support tube 2, an end rod 3, a rear sleeve 4, a transmission mechanism 5, and a locking mechanism 6. The upper end of the central support tube 2 is fixed in the mounting base 1, and the lower end is inserted into the rear sleeve 4. The end rod 3 is inserted into the central support tube 2. Both the end rod 3 and the rear sleeve 4 are supported by the central support tube 2 and are allowed to reciprocate along the length of the central support tube 2. The transmission mechanism 5 is located on the central support tube 2 and connects the end rod 3 and the rear sleeve 4. The transmission mechanism 5 can drive the end rod 3 and the rear sleeve 4 to move in opposite directions, thus achieving bidirectional telescopic movement in a single step, providing quick and smooth adjustment, and is more suitable for ultra-high... For painting and repair work, the outer wall of the rear sleeve 4 is covered with soft rubber to reduce hand fatigue and prevent blisters during prolonged use. The locking mechanism 6 is located on the mounting base 1 and locks with the end rod 3. In the locked state, the end rod 3 and the rear sleeve 4 connected through the transmission mechanism 5 will remain in the adjusted position, thereby fixing the overall extension and retraction of the paint rod. The locking mechanism 6 can also be unlocked to allow the position of the end rod 3 and the rear sleeve 4 to be freely adjusted. In particular, it also includes an over-position protection mechanism 7, which includes a fixed support 701, a movable support 702, and a buffer spring 703. The fixed support 701 is located at the bottom of the central support tube 2, and a groove 201 is opened on the outer peripheral wall of the central support tube 2. The movable support 702 is located on the central support tube. Inside the center support tube 2, the movable support 702 and the fixed support 701 are vertically opposite each other. The first spring 703 is located between the fixed support 701 and the movable support 702. A slider 702a is formed on the movable support 702 corresponding to the sliding groove 201. The slider 702a slides with the sliding groove 201 and extends outward through the sliding groove 201, forming a lower step position 702b with the outer wall of the center support tube 2. The inner wall of the rear tube sleeve 4 has an upper step position 402b, which is vertically opposite to the lower step position 702b. It should be noted that there are two sliding grooves 201, and the corresponding movable support 702 has two sliders 702a, so that the movable support 702 remains balanced when the sliders 702a slide along the sliding groove 201. Near the lower end of the central support tube 2, the corresponding lower step 702b is also near the lower end of the central support tube 2. When the extension stroke of the paint rod of this utility model approaches its maximum range, that is, when the rear sleeve 4 moves downward along the central support tube 2 to near its maximum stroke, the upper step 402b on its inner wall will abut against the lower step 702b formed between the slider 702a and the outer wall of the central support tube 2, forming a stepped fit. As the rear sleeve 4 moves further, it will push the slider 702a and the entire movable support 702 to move along the slide groove 201. The distance between the movable support 702 and the fixed support 701 will decrease, and the first spring 703 will be compressed. When the slider 702a abuts against the end of the slide groove 201, it will limit the movable support 702 and prevent it from moving further downward.This prevents the rear sleeve 4 and the end rod 3 connected via the transmission mechanism 5 from moving, forming over-extension protection to prevent excessive elongation and damage to the transmission mechanism 5, ensuring the normal operation of the bidirectional telescopic function. Simultaneously, the elastic force generated when the first spring 703 is compressed will be converted into continuous resistance preventing the rear sleeve 4 from moving downwards, providing tactile feedback to the user, reminding them that the telescopic stroke is approaching its maximum range. After the control applied to the rear sleeve 4 is removed, the first spring 703 will return to its original shape and drive the movable support 702 to reset. This allows the movable support 702 to move the rear sleeve 4 and end rod 3 back a certain distance, ensuring that the entire length of the paint rod remains within the allowable elongation range.

[0040] like Figure 3 , Figure 4 and Figure 8 As shown, the fixed support 701 and the movable support 702 respectively have a fixed guide post 701 and a movable guide post 702c. The fixed guide post 701 and the movable guide post 702c are opposite each other. The two ends of the first spring 703 are respectively sleeved on the fixed guide post 701 and the movable guide post 702c, thereby ensuring that the first spring 703 extends and contracts in a straight line, providing better elastic support, protecting the first spring 703, and extending its service life.

[0041] like Figure 3 , Figure 5 and Figure 7 As shown, the rear tube sleeve 4 includes a tube body 401, an upper tube cap 402, and a lower tube cap 403. The upper tube cap 402 and the lower tube cap 403 are respectively disposed at the upper and lower ends of the tube body 401. A stop block 402a is formed on the inner wall of the upper tube cap 402. The stop block 402a protrudes inward toward the inside of the tube body 401, so that an upper step position 402b is formed between the stop block 402a and the inner wall of the tube body 401. When the rear tube sleeve 4 moves down along the central support tube 2, it will abut against the slider 702a of the movable support 702 through the stop block 402a, thereby driving the movable support 702 to move.

[0042] like Figure 4 and Figure 6 As shown, a wing plate 702d is formed on the slider 702a. The wing plate 702d fits against the outer wall of the central support tube 2, thereby preventing the slider 702a from shrinking inward and disengaging from the slide groove 201, so that the movable support 702 and the central support tube 2 can be stably matched. A step position 702b is formed between the wing plate 702d and the outer wall of the central support tube 2.

[0043] like Figures 8 to 10As shown, the transmission mechanism 5 consists of two parts: a transmission wheel 501 and a transmission belt 502. A wheel cavity 701b is formed in the fixed support 701, and the transmission wheel 501 is hinged within the wheel cavity 701b. A belt inlet 701c and a belt outlet 701d are also formed on the outer wall of the fixed support 701. Both the belt inlet 701c and the belt outlet 701d communicate with the wheel cavity 701b. The belt inlet 701c communicates with the interior of the central support tube 2, and the belt outlet 701d communicates with the interior of the rear tube sleeve 4. One end of the transmission belt 502 is connected to the end rod 3, and the other end passes sequentially through the belt inlet 701c, the wheel cavity 701b, and the belt outlet 701d into the rear tube sleeve 4, where it connects. 2. The fixed support 701, which is mounted on the transmission wheel 501, houses the transmission wheel 501 and the transmission belt 502 in the inner wheel cavity 701b, thus providing closed protection. Here, the process of realizing the bidirectional extension and retraction function of the paint rod of this utility model through the transmission mechanism 5 is described. Taking the overall length extension as an example, when the rear tube sleeve 4 moves down along the central support tube 2, it drags the transmission belt 502. The transmission belt 502 drives around the transmission wheel 501, and the height difference between the two ends of the transmission belt 502 changes. The end connected to the rear tube sleeve 4 moves down, while the other end connected to the end rod 3 moves up and drives the end rod 3 to move outward of the central support tube 2, so that the entire paint rod extends in both directions. Conversely, it shrinks in both directions.

[0044] like Figure 8 As shown, the two ends of the transmission belt 502 are fixed to the rear tube sleeve 4 and the end rod 3 respectively by positioning bolts 8. In this utility model, there are two positioning bolts 8 for fixing both ends of the transmission belt 502. The transmission belt 502 is securely connected to the end rod 3 and the rear tube sleeve 4 by means of two-point fixing, so as to avoid loosening during transmission.

[0045] like Figure 2 , Figure 9 , Figures 11 to 15 As shown, it also includes a steel ruler 9, which is mounted on the end rod 3. The steel ruler 9 is arranged along the length of the end rod 3, and multiple locking holes 901 are sequentially opened along the length of the steel ruler 9. In this utility model, the number of locking holes is 50. The locking mechanism 6 cooperates with any of the locking holes 901 to lock the end rod 3. That is to say, the locking mechanism 6 can cooperate with the locking holes 901 at different positions to keep the entire paint rod at an adjustable length, avoiding the problem of uneven coating caused by accidental slippage of the end rod 3 and the rear sleeve 4 during painting and repair operations. At the same time, it reduces the time spent by users on repeated adjustments and achieves precise adjustment, thus making it more suitable for ultra-high position painting and repair operations.

[0046] like Figure 9 , Figures 11 to 15As shown, the locking mechanism 6 consists of a locking button 601, a second spring 602, and a locking sleeve 603. An outer mounting groove 101 is formed on the outer side wall of the mounting base 1, and an inner mounting groove 102 is formed on its inner side wall. A locking channel 103 connecting the outer mounting groove 101 and the inner mounting groove 102 is also formed on the mounting base 1. The locking button 601 and the locking sleeve 603 are respectively located in the outer mounting groove 101 and the inner mounting groove 102. The locking sleeve 603 is fitted onto the end rod 3. It should be noted that the height of the locking sleeve 603 is less than the height of the inner mounting groove 102, and the height of its inner ring is less than the height of the end rod 3. This allows the locking sleeve 603 to move up and down within the inner mounting groove 102 and simultaneously move up and down relative to the end rod 3. The inner ring of the locking sleeve 603 has a locking tongue 603a. In the locked state... The locking tongue 603a is inserted into any of the lock holes 901. The outer wall of the locking tongue 603a abuts against the inner wall of the lock hole 901 to prevent the steel strip ruler 9, the end rod 3, and the rear tube sleeve 4 from moving. When the lock sleeve 603 is disengaged from its initial position, the locking tongue 603a can disengage from the lock hole 901, thereby releasing the lock. The locking button 601 has a guide rod 601a, which passes through the locking channel 103 and is connected to the lock sleeve 603. Pressing the locking button 601 moves the lock sleeve 603. The second spring 602 is sleeved on the guide rod 601a, with its two ends abutting against the bottom of the locking button 601 and the outer mounting groove 101, respectively. After the locking button 601 is pressed, the second spring 602 will be compressed, and after the pressure is removed, it will automatically reset the locking button 601 to prepare for the next press.

[0047] like Figure 15 As shown, a fitting groove 301 is provided on the outer wall of the end rod 3 along the length direction. Side grooves 302 are provided on the left and right side walls of the fitting groove 301. The steel strip ruler 9 is embedded in the fitting groove 301, and its left and right sides cooperate with the side grooves 302, thereby preventing the steel strip ruler 9 from falling out of the fitting groove 301 and realizing a stable connection with the end rod 3.

[0048] like Figure 7 and Figure 8 As shown, multiple guide protrusions 401a are arranged in a ring on the inner wall of the rear tube sleeve 4, and guide grooves 701e are correspondingly provided on the outer peripheral wall of the fixed support 701. The guide grooves 701e and guide protrusions 401a slide in cooperation. The cooperation between the guide protrusions 401a and guide grooves 701e can ensure that the rear tube sleeve 4 moves smoothly in a straight line and reduce the shaking during the movement of the rear tube sleeve 4, thus achieving silent adjustment.

[0049] like Figure 1 and Figure 2 As shown, the upper end of the end rod 3 is provided with a threaded connection seat 10. The threaded connection seat 10 allows for threaded connection with painting and repair tools such as paintbrushes, paint rollers, and paint scrapers, enabling quick assembly and disassembly, thereby improving the efficiency of painting and repair operations.

[0050] Combination Figures 1 to 15 In use, the paint rod of this utility model is first connected to the threaded connection seat 10 by threading a paintbrush, paint scraper, paint roller, or other necessary painting and repair tools. Then, it can be adjusted bidirectionally for extension and retraction as needed. The user first presses the locking button 601 of the locking mechanism 6, causing the locking sleeve 603 to move within the inner mounting groove 102 of the mounting seat 1, thereby disengaging its locking tongue 603a from the locking hole 901 of the steel strip ruler 9. At this time, the rear sleeve 4 and the end rod 3 can be simultaneously controlled to move in opposite directions. The transmission belt 502 of the transmission mechanism 5 winds around the transmission wheel 50. 1. Transmission: When the height difference between the two ends changes, the end connected to the rear tube sleeve 4 moves downward, while the other end connected to the end rod 3 moves upward, causing the end rod 3 to move outward towards the center support tube 2, thus extending the entire paint rod in both directions. Conversely, it retracts in both directions. After adjustment, the pressure on the locking button 601 is removed, allowing the second spring 602 to reset, which in turn resets the locking sleeve 603. This causes the locking tongue 603a to re-engage with the corresponding locking hole 901 of the steel strip ruler 9, resulting in a locked position. If the extension stroke of the paint rod is close to its maximum range, the rear tube... The upper step 402b on the inner wall of sleeve 4 abuts against the lower step 702b formed between slider 702a and the outer wall of the central support tube 2, forming a stepped fit. As the rear tube sleeve 4 moves further, it will push slider 702a and the entire movable support 702 to move along the slide groove 201. The distance between the movable support 702 and the fixed support 701 will decrease, and the first spring 703 will be compressed. When slider 702a abuts against the end of slide groove 201, it will limit the movable support 702, preventing it from moving further downward, thereby preventing the rear tube sleeve 4 and the through... The movement of the end rod 3 connected by the transmission mechanism 5 forms over-extension protection. At the same time, the elastic force generated when the first spring 703 is compressed will also be converted into a continuous resistance to prevent the rear sleeve 4 from moving downward, and provide tactile feedback to the user, reminding the user that the extension stroke is close to the maximum range. After the control applied to the rear sleeve 4 is removed, the first spring 703 will restore its deformation and drive the movable support 702 to reset. In this way, the movable support 702 can drive the rear sleeve 4 and the end rod 3 to move back a certain distance, ensuring that the length of the entire paint rod remains within the allowable elongation range.

[0051] The embodiments and descriptions above are merely illustrative of the principles and preferred embodiments of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A bidirectional telescopic paint rod with over-extension protection, comprising a mounting base (1), a central support tube (2), an end rod (3), a rear sleeve (4), a transmission mechanism (5), and a locking mechanism (6), wherein the upper end of the central support tube (2) is fixed in the mounting base (1), and the lower end is inserted into the rear sleeve (4); the end rod (3) is inserted into the central support tube (2); the transmission mechanism (5) is disposed on the central support tube (2) and connects the end rod (3) and the rear sleeve (4); and the locking mechanism (6) is disposed on the mounting base (1) and locks with the end rod (3), characterized in that, It also includes an over-position protection mechanism (7), which includes a fixed support (701), a movable support (702), and a first spring (703). The fixed support (701) is located at the bottom of the central support tube (2). A groove (201) is provided on the outer peripheral wall of the central support tube (2). The movable support (702) is located inside the central support tube (2) and is opposite to the fixed support (701). The first spring (703) is located between the fixed support (701) and the movable support (702). A slider (702a) is formed on the movable support (702) corresponding to the groove (201). The slider (702a) passes outward through the groove (201) and slides with the groove (201). The inner wall of the rear sleeve (4) has an upper step (402b) which is opposite to the slider (702a).

2. A bidirectional telescopic paint rod with over-extension protection according to claim 1, characterized in that, The fixed support (701) and the movable support (702) have a fixed guide post (701a) and a movable guide post (702c) respectively. The fixed guide post (701a) and the movable guide post (702c) are opposite to each other. The two ends of the first spring (703) are respectively sleeved on the fixed guide post (701a) and the movable guide post (702c).

3. A bidirectional telescopic paint rod with over-extension protection according to claim 1, characterized in that, The rear sleeve (4) includes a tube body (401), an upper tube cap (402) and a lower tube cap (403). The upper tube cap (402) and the lower tube cap (403) are respectively disposed at the upper and lower ends of the tube body (401). A stop block (402a) is formed on the inner wall of the upper tube cap (402), and an upper step position (402b) is formed between the stop block (402a) and the inner wall of the tube body (401).

4. A bidirectional telescopic paint rod with over-extension protection according to claim 1, characterized in that, A wing plate (702d) is formed on the slider (702a), and a step (702b) is formed between the wing plate (702d) and the outer wall of the central support tube (2).

5. A bidirectional telescopic paint rod with over-extension protection according to claim 1, characterized in that, The transmission mechanism (5) includes a transmission wheel (501) and a transmission belt (502). A wheel cavity (701b) is provided in the fixed support (701). The transmission wheel (501) is hinged in the wheel cavity (701b). The outer wall of the fixed support (701) is also provided with a belt inlet (701c) and a belt outlet (701d) that communicate with the wheel cavity (701b). The belt inlet (701c) communicates with the interior of the central support tube (2). The belt outlet (701d) communicates with the interior of the rear tube sleeve (4). One end of the transmission belt (502) is connected to the end rod (3). The other end passes through the belt inlet (701c), the wheel cavity (701b) and the belt outlet (701d) in sequence and is connected to the rear tube sleeve (4). The transmission belt (502) is wound around the transmission wheel (501).

6. A bidirectional telescopic paint rod with over-extension protection according to claim 5, characterized in that, The two ends of the transmission belt (502) are fixed to the rear sleeve (4) and the end rod (3) respectively by positioning bolts (8).

7. A bidirectional telescopic paint rod with over-extension protection according to claim 1, characterized in that, It also includes a steel strip ruler (9), which is mounted on the end rod (3). The steel strip ruler (9) has lock holes (901) sequentially opened along the length direction. The locking mechanism (6) cooperates with any of the lock holes (901) to lock the end rod (3).

8. A bidirectional telescopic paint rod with over-extension protection according to claim 7, characterized in that, The locking mechanism (6) includes a locking button (601), a second spring (602), and a locking sleeve (603). The mounting base (1) has an outer mounting groove (101) on its outer side wall and an inner mounting groove (102) on its inner side wall. It also has a locking channel (103) connecting the outer mounting groove (101) and the inner mounting groove (102). The locking button (601) and the locking sleeve (603) are respectively located in the outer mounting groove (101) and the inner mounting groove (102). The locking sleeve (603) is fitted onto the end rod (3). The lock sleeve (603) can move up and down in the inner mounting groove (102) and move up and down relative to the end rod (3). The inner ring of the lock sleeve (603) has a locking tongue (603a), which is inserted into any lock hole (901). The locking button (601) has a guide rod (601a), which passes through the locking channel (103) and is connected to the lock sleeve (603). The second spring (602) is sleeved on the guide rod (601a), and its two ends abut against the bottom of the locking button (601) and the outer mounting groove (101), respectively.

9. A bidirectional telescopic paint rod with over-extension protection according to claim 8, characterized in that, The end rod (3) has a fitting groove (301) along its length on its outer wall. The fitting groove (301) has side grooves (302) on its left and right side walls. The steel strip ruler (9) is embedded in the fitting groove (301) and its left and right sides cooperate with the side grooves (302).

10. A bidirectional telescopic paint rod with over-extension protection according to claim 1, characterized in that, The inner wall of the rear sleeve (4) is provided with a guide protrusion (401a), and the outer peripheral wall of the fixed support (701) is provided with a guide groove (701e), which slides in cooperation with the guide protrusion (401a).

11. A bidirectional telescopic paint rod with over-extension protection according to claim 10, characterized in that, The upper end of the end rod (3) is provided with a threaded connection seat (10).

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