Telescopic pull rod structure of a cleaning machine

Abstract

The utility model belongs to the technical field of cleaning machine accessories, specifically relates to a telescopic pull rod structure of cleaning machine, including pull rod subassembly and control assembly, the pull rod subassembly includes the casing, two parallelly arranged pull rod, handle connected in two pull rod top, left guide rail and right guide rail, the control assembly includes slide bar, transmission rod, telescopic button, roller, button spring and slide bar spring, two pull rod top and handle front cover, handle rear cover fixed formation U type pull rod subassembly, middle part is equipped with a plurality of second fixed hole, bottom is equipped with the limit post, the utility model discloses adopt the structural design of double pull rod cooperation left, right guide rail, replace traditional multi-connecting rod nested form, greatly reduce the number of parts, simplify overall structure and assembly process, while the cooperation of double pull rod and guide rail improves the structure bearing strength, avoids the defect that single pull rod is easy to bend, need not rely on thick wall metal pipe to guarantee use stability, effectively reduce material and processing cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of cleaning machine accessories, specifically, it relates to a telescopic pull rod structure for a cleaning machine. Background Technology

[0002] To balance portability and compact storage, existing high-pressure washers generally employ a mobile structure using rollers and telescopic rods. The telescopic rod, as a core component, directly impacts user experience and cost control. Currently, most mainstream telescopic rod structures in the industry borrow from or directly adopt the two- or three-link design of luggage handles. This type of structure requires a multi-tube nesting configuration (inner, middle, and outer tubes) and a complex push-button lock transmission mechanism. This not only results in a large number of parts and cumbersome assembly processes but also significant performance and cost drawbacks: Firstly, due to space constraints imposed by the transmission mechanism and the strength requirements of each telescopic tube, each tube must be designed with a thin wall structure, leading to poor overall strength and susceptibility to deformation or damage from external impacts. To ensure basic strength, this type of structure typically requires metal tubing, significantly increasing material and processing costs. Secondly, the high precision required for the multi-link nesting and complex transmission mechanism can lead to jamming and difficulty in unlocking after prolonged use, affecting the rod's extension efficiency and reducing user experience.

[0003] Patent CN212041726U discloses a tie rod structure for a cleaning machine. It achieves telescopic movement by using a single tie rod body in conjunction with a guide sleeve, and locks using a ball bearing and a positioning hole. While this simplifies the linkage structure to some extent, it still has shortcomings: the structure relies solely on a single tie rod to bear the tension, making it prone to bending and deformation over long-term use. Furthermore, the ball bearing locking mechanism has a small contact area, making it susceptible to positioning failure under high-frequency telescopic or vibration conditions, failing to meet the stability and durability requirements of the tie rod during the movement of a high-pressure washer. Simultaneously, controlling the clearance between the guide sleeve and the tie rod is difficult; an excessively large clearance causes the tie rod to wobble, while an excessively small clearance increases telescopic resistance, failing to effectively resolve the core contradiction between structural strength and ease of operation in existing designs.

[0004] In summary, existing telescopic rod structures for high-pressure cleaners generally suffer from problems such as complex structure, insufficient strength, high cost, and poor reliability. There is an urgent need to design a dedicated telescopic rod structure that is simplified, has excellent strength, is cost-controllable, and is stable in operation, in order to meet the actual usage requirements of high-pressure cleaners. Utility Model Content

[0005] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a telescopic rod structure for a cleaning machine.

[0006] The present invention provides a telescopic pull rod structure for a cleaning machine, comprising a pull rod assembly and a control assembly; The pull rod assembly includes a housing, two parallel pull rods, a handle connected to the top of the two pull rods, a left guide rail, and a right guide rail. The left and right guide rails are fixed inside the housing and cooperate with the two pull rods respectively. The two pull rods can slide up and down along the left and right guide rails. The middle of the pull rods is provided with multiple second fixing holes, and the bottom of the pull rods is provided with limiting posts. The control assembly includes a slide rod, a transmission rod, a telescopic button, a roller, a button spring, and a slide rod spring. The slide rod can slide left and right and has a positioning post on it. The positioning post can be inserted into or released from the second fixing hole of the pull rod. The roller is located on the slide rod. The transmission rod cooperates with the roller and its top is connected to the telescopic button. The button spring provides a return force for the telescopic button, and the slide rod spring provides a return force for the slide rod. Pressing or releasing the telescopic button can drive the slide rod to move left and right via the transmission rod and the roller, thereby locking or unlocking the positioning post from the second fixing hole.

[0007] In a preferred embodiment, both of the pull rods have a first fixing hole at their tops. The handle includes a front cover and a rear cover. The inner sides of both ends of the front cover are provided with screw posts that can pass through the first fixing hole. The front cover and the rear cover are clamped and fixed by self-tapping screws to form a U-shaped structure.

[0008] In a preferred embodiment, limiting holes are provided on the left and right sides of the top of the housing, and the limiting holes are clearance-fitted with the pull rods; the left guide rail and the right guide rail are respectively located below the limiting holes, and the inner walls of the left guide rail and the right guide rail are each provided with a plurality of limiting cylinders in a ring shape, and the left guide rail and the right guide rail are clearance-fitted with the two pull rods respectively.

[0009] In a preferred embodiment, screw holes are provided on both sides of the mounting portion of the left and right guide rails, and screw posts are provided on the inner wall of the housing. The left and right guide rails are fixedly connected to the screw posts of the housing by self-tapping screws. A third fixing hole is provided at the bottom of the two pull rods, and the limiting post is fixed to the pull rod by cooperating with the third fixing hole by self-tapping screw.

[0010] In a preferred embodiment, a square slide groove is provided on the top of the housing, the square slide groove is located between the left guide rail and the right guide rail, the slide rod is disposed in the square slide groove and is in clearance fit with the square slide groove; the slide rod is provided with symmetrical extensions on the left and right sides of its front side, the left extension is provided with a left positioning post of the slide rod, the right extension is provided with a right positioning post of the slide rod, and the left positioning post of the slide rod and the right positioning post of the slide rod are disposed on the same side.

[0011] In a preferred embodiment, the right end of the slide rod is provided with a slide rod spring positioning post, the inner side of the right guide rail is provided with a guide rail spring positioning post, and the slide rod spring is installed between the slide rod spring positioning post and the guide rail spring positioning post.

[0012] In a preferred embodiment, a square groove is provided in the middle of the slide rod, and a fourth fixing hole is provided at the upper end of the middle of the square groove. One end of the roller is stepped, and the other end is provided with a groove. An E-type open retaining ring is provided in the groove. The roller is limited on the slide rod by the fourth fixing hole and the E-type open retaining ring, and the roller and the fourth fixing hole are in clearance fit.

[0013] In a preferred embodiment, the transmission rod is disposed above the square groove of the slide rod, the bottom surface of the transmission rod is inclined and cooperates with the roller; a limiting hole cooperating with the transmission rod is provided in the center of the top of the housing, and the transmission rod and the limiting hole are clearance-fitted.

[0014] In a preferred embodiment, a groove is provided at the center of the bottom of the telescopic button, and the telescopic button is fixed to the top of the transmission rod through the groove.

[0015] In a preferred embodiment, the button spring is disposed between the telescopic button and the housing, the telescopic button is provided with limit buckles on the left and right sides, and the housing is provided with limit grooves corresponding to the limit buckles.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model adopts a structure design with double tie rods and left and right guide rails, replacing the traditional multi-link nested form, which greatly reduces the number of parts, simplifies the overall structure and assembly process, and the cooperation between the double tie rods and guide rails improves the structural load-bearing strength, avoids the defect of easy bending of a single tie rod, and can ensure the stability of use without relying on thick-walled metal tubes, effectively reducing material and processing costs.

[0017] 2. The control component of this utility model converts the vertical pressing action into the horizontal movement of the slide rod through the rolling cooperation of the inclined surface of the transmission rod and the roller. Compared with the ball-type locking mechanism, the contact is more stable and the wear is less. In addition, the mating area between the positioning post and the second fixing hole is larger, and it can still lock stably in high-frequency extension or vibration environment, avoiding positioning failure and improving the reliability of use.

[0018] 3. The sliding rod and square groove, and the pull rod and guide rail are precisely designed with precise clearance fit. Combined with the rolling friction transmission structure, the resistance during the extension and retraction of the pull rod is reduced, making operation easier and smoother. At the same time, the cooperation between the limit post and the guide rail can prevent the pull rod from being pulled out excessively. The limit buckle and limit groove control the travel of the button, further improving the convenience and safety of use.

[0019] 4. The overall structure of this utility model is compact, and the connection of each component is reliable. It does not require complex precision control, which reduces the risk of jamming after long-term use. It is suitable for the frequent use scenarios of moving and storing high-pressure washers, extends the service life of the pull rod, and takes into account multiple needs such as structural simplification, strength improvement and cost control. Attached Figure Description

[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the U-shaped tie rod assembly of this utility model; Figure 3 This is a schematic diagram of the assembly structure of the housing and guide rail of this utility model; Figure 4 This utility model Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the assembly structure of the slide bar and roller of this utility model; Figure 6 This is a schematic diagram of the tie rod structure of this utility model; Figure 7 This utility model Figure 6 Enlarged view at point B in the middle; Figure 8 This is a top view of the guide rail and slide bar assembly of this utility model.

[0021] The following are the labeling elements in the figure: 1. Housing; 2. Button spring; 3. Transmission rod; 4. Telescopic button; 5. Pull rod; 6. Handle back cover; 7. Handle front cover; 8. Limiting post; 9. Slide rod; 10. Roller; 11. E-type open retaining ring; 12. Left guide rail; 13. Slide rod spring; 14. Right guide rail; 15. Self-tapping screw; 901. Slide rod left positioning post; 902. Slide rod right positioning post; 903. Slide rod spring positioning post; 1401. Guide rail spring positioning post. Detailed Implementation

[0022] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0023] like Figures 1-8 As shown, this utility model provides a telescopic pull rod structure for a cleaning machine, including a pull rod assembly and a control assembly. The pull rod assembly includes a housing 1, two pull rods 5, a handle, a left guide rail 12 and a right guide rail 14. The control assembly includes a slide rod 9, a transmission rod 3, a telescopic button 4, a roller 10, a button spring 2 and a slide rod spring 13.

[0024] Both pull rods 5 have a first fixing hole that runs through them from front to back at the top. The inner sides of both ends of the handle front cover 7 are provided with screw posts that can pass through the first fixing holes. After the screw posts pass through the fixing holes, the handle front cover 7 is clamped to the handle rear cover 6 and fixed with multiple self-tapping screws 15 to form a complete U-shaped pull rod assembly, which is convenient for users to hold and pull. Multiple second fixing holes are equally spaced in the middle of the two pull rods 5. A third fixing hole is provided at the bottom of both pull rods 5. Two limiting posts 8 are fixed to the two pull rods 5 respectively by self-tapping screws 15 and the third fixing holes. The limiting posts 8 at the bottom of the pull rods 5 can block the bottom of the guide rail when the pull rods 5 are pulled out to the maximum height, preventing the pull rods 5 from detaching from the guide rail.

[0025] Limiting holes are provided on the top left and right sides of the housing 1. The limiting holes are clearance-fitted with the pull rod 5. The limiting holes on the top of the housing 1 provide movement guidance for the pull rod 5. The left guide rail 12 and the right guide rail 14 are respectively provided below the two limiting holes of the housing 1. Multiple screw holes are provided on both sides of the mounting part of the left guide rail 12 and the mounting part of the right guide rail 14. Multiple screw posts are fixedly provided on the inner wall of the housing 1. Multiple self-tapping screws 15 pass through the mounting parts of the left guide rail 12 and the right guide rail 14 and are fixed to the housing 1 respectively with the multiple screw posts of the housing 1. Multiple limiting cylinders for limiting the placement of the pull rod 5 are provided in a ring on the inner wall of the left guide rail 12 and the inner wall of the right guide rail 14. The limiting cylinders make the left guide rail 12 and the right guide rail 14 clearance-fitted with the two pull rods 5 respectively, ensuring smooth up and down movement of the pull rod 5.

[0026] A square slide groove is provided on the top of the housing 1. The square slide groove is located between the left guide rail 12 and the right guide rail 14. A slidable square slide rod 9 is provided in the square slide groove. The slide rod 9 is in clearance fit with the square slide groove, so that the slide rod 9 can slide freely in the left and right directions in the square slide groove. Two extensions are symmetrically arranged on the front side of the slide rod 9. The left positioning post 901 of the slide rod 9 is fixedly installed on the left extension of the slide rod 9, and the right positioning post 902 of the slide rod 9 is fixedly installed on the right extension of the slide rod 9. The left positioning post 901 and the right positioning post 902 of the slide rod are arranged on the same side, and the left positioning post 901 and the right positioning post 902 of the slide rod are used to laterally limit the pull rod 5.

[0027] The right end of the slide rod 9 is provided with a slide rod spring positioning post 903 for fixing the slide rod spring 13, and the inner side of the right guide rail 14 is provided with a guide rail spring positioning post 1401. The slide rod spring 13 is placed between the slide rod spring positioning post 903 and the guide rail spring positioning post 1401. When the slide rod spring 13 is in its natural state, the left slide rod positioning post 901 and the right slide rod positioning post 902 are embedded in the second fixing hole of the pull rod 5 to achieve the positioning of the pull rod 5.

[0028] The right guide rail 14 is fixed on the housing 1, and the slide rod 9 can move left and right. When the two pull rods 5 of the U-shaped pull rod assembly pass through the left guide rail 12 and the right guide rail 14 respectively and hit the second fixing holes of the two pull rods 5, under the compression of the slide rod spring 13, the left positioning post 901 and the right positioning post 902 of the slide rod are pressed into the second fixing holes of different pull rods 5 respectively, so that the pull rod 5 can be fixed when it moves up and down.

[0029] A square groove is formed in the middle of the slide rod 9. A fourth fixing hole for the limiting roller 10 is formed at the upper end of the middle of the square groove. One end of the roller 10 is stepped, and the other end is formed into a groove that allows the fixing of the E-type open retaining ring 11, thereby limiting the roller 10 on the slide rod 9. At this time, the roller 10 and the fourth fixing hole are in clearance fit, allowing the roller 10 to rotate freely on the slide rod 9, converting the sliding friction between the transmission rod 3 and the slide rod 9 into rolling friction, effectively reducing the operating resistance. A transmission rod 3 is set above the middle groove of the slide rod 9, which is linked with the roller 10. The top of the transmission rod 3 is set with a bottom surface that is aligned with the roller 10. The bottom surface of the transmission rod 3 is designed to be inclined. When the transmission rod 3 moves downward, its inclined surface rolls with the roller 10, forcing the slide rod 9 to move to the left and compressing the slide rod spring 13. The positioning post disengages from the second fixing hole, and the user can push the pull rod 5 to adjust the telescopic length. After releasing the telescopic button 4, the button spring 2 pushes the telescopic button 4 and the transmission rod 3 to reset. The slide rod 9 moves to the right under the action of the slide rod spring 13, and the positioning post re-embeds into the corresponding position of the second fixing hole, completing the locking of the pull rod 5. A limiting hole for the transmission rod 3 is provided in the center of the top of the housing 1, so that the limiting hole of the transmission rod 3 and the transmission rod 3 are in clearance fit, allowing it to move freely up and down.

[0030] A telescopic button 4 is provided on the top of the transmission rod 3. A groove is opened in the center of the bottom of the telescopic button 4. The groove of the telescopic button 4 is tightly fixed to the top of the transmission rod 3. A button spring 2 is provided between the telescopic button 4 and the housing 1. When the telescopic button 4 is released, the telescopic button 4 and the transmission rod 3 are reset under the action of the button spring 2.

[0031] Limit buckles are provided on both sides of the telescopic button 4, and limit grooves corresponding to the limit buckles are provided on the housing 1. The limit buckles on both sides of the telescopic button 4 cooperate with the limit grooves of the housing 1 to control the up and down movement of the button and avoid damage to the parts due to excessive pressing. When the telescopic button 4 is pressed, the inclined surface of the transmission rod 3 rolls and rubs against the slide rod 9, pushing the slide rod 9 to move back and forth, so that the left positioning post 901 and the right positioning post 902 of the slide rod are locked with the second fixing holes on different pull rods 5 respectively, thereby achieving the purpose of controlling the stroke of the pull rod 5.

[0032] Working principle This utility model achieves extension and retraction control of the lever 5 through three stages: unlocking, adjustment, and locking. In the initial state, the slide bar spring 13 extends naturally, pushing the slide bar 9 to the right, so that the left positioning post 901 and the right positioning post 902 of the slide bar are respectively inserted into the second fixing hole of the pull rod 5, locking the pull rod 5 at the current length; When adjustment is needed, press the telescopic button 4 to compress the button spring 2, which drives the transmission rod 3 to move down. Its inclined surface rolls with the roller 10 on the slide rod, forcing the slide rod 9 to overcome the elastic force of the slide rod spring 13 and move to the left. The positioning post disengages from the second fixing hole, the pull rod 5 is unlocked, and it can freely extend and retract up and down along the limiting cylinder of the left guide rail 12 and the right guide rail 14. After adjusting to the target length, release the telescopic button 4. The button spring 2 pushes the telescopic button 4 and the transmission rod 3 to reset. The slide rod 9 moves to the right under the action of the slide rod spring 13. The positioning post is re-embedded into the corresponding second fixing hole, completing the re-locking of the pull rod 5. The whole process transforms vertical pressing into horizontal movement through mechanical linkage, and reduces resistance with rolling friction to achieve labor-saving and stable telescopic control.

[0033] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A telescopic pull rod structure for a cleaning machine, characterized in that, Includes lever assembly and control assembly; The pull rod assembly includes a housing (1), two parallel pull rods (5), a handle connected to the top of the two pull rods (5), a left guide rail (12), and a right guide rail (14). The left guide rail (12) and the right guide rail (14) are fixed inside the housing (1), and the left guide rail (12) and the right guide rail (14) respectively cooperate with the two pull rods (5). The two pull rods (5) can slide up and down along the left guide rail (12) and the right guide rail (14). The pull rod (5) has multiple second fixing holes in the middle, and the pull rod (5) has a limiting post (8) at the bottom. The control components include a slide rod (9), a transmission rod (3), a telescopic button (4), a roller (10), a button spring (2), and a slide rod spring (13). The slide rod (9) can slide left and right and is provided with a positioning post. The positioning post can be inserted into or released from the second fixing hole of the pull rod (5). The roller (10) is located on the slide rod (9). The transmission rod (3) cooperates with the roller (10) and its top is connected to the telescopic button (4). The button spring (2) provides a reset force for the telescopic button (4), and the slide rod spring (13) provides a reset force for the slide rod (9). Pressing or releasing the telescopic button (4) can drive the slide rod (9) to move left and right through the transmission rod (3) and the roller (10), thereby locking or unlocking the positioning post and the second fixing hole.

2. The telescopic rod structure of the cleaning machine according to claim 1, characterized in that, Both of the pull rods (5) have a first fixing hole at the top. The handle includes a front cover (7) and a rear cover (6). The inner sides of both ends of the front cover (7) are provided with screw posts that can pass through the first fixing hole. The front cover (7) and the rear cover (6) are clamped and fixed by self-tapping screws (15) to form a U-shaped structure.

3. The telescopic tie rod structure of the cleaning machine according to claim 1, characterized in that, The top left and right sides of the housing (1) are provided with limiting holes, which are clearance fit with the pull rod (5); the left guide rail (12) and the right guide rail (14) are respectively located below the limiting holes. The inner wall of the left guide rail (12) and the inner wall of the right guide rail (14) are provided with multiple limiting cylinders in a ring shape. The left guide rail (12) and the right guide rail (14) are clearance fit with the two pull rods (5) respectively.

4. The telescopic tie rod structure of the cleaning machine according to claim 3, characterized in that, The mounting portions of the left guide rail (12) and the right guide rail (14) are provided with screw holes on both sides. The inner wall of the housing (1) is provided with screw posts. The left guide rail (12) and the right guide rail (14) are fixedly connected to the screw posts of the housing (1) by self-tapping screws (15). The bottom of the two pull rods (5) is provided with a third fixing hole. The limiting post (8) is fixed to the pull rod (5) by self-tapping screws (15) and the third fixing hole.

5. The telescopic tie rod structure of the cleaning machine according to claim 1, characterized in that, The top of the housing (1) is provided with a square slide groove, which is located between the left guide rail (12) and the right guide rail (14). The slide rod (9) is located in the square slide groove and is fitted with the square slide groove with a clearance. The slide rod (9) has symmetrical extensions on the left and right sides of its front side. The left extension is provided with a slide rod left positioning post (901), and the right extension is provided with a slide rod right positioning post (902). The slide rod left positioning post (901) and the slide rod right positioning post (902) are located on the same side.

6. The telescopic tie rod structure of the cleaning machine according to claim 5, characterized in that, The right end of the slide bar (9) is provided with a slide bar spring positioning post (903), the inner side of the right guide rail (14) is provided with a guide rail spring positioning post (1401), and the slide bar spring (13) is installed between the slide bar spring positioning post (903) and the guide rail spring positioning post (1401).

7. The telescopic rod structure of the cleaning machine according to claim 5, characterized in that, The slide bar (9) has a square groove in the middle, and a fourth fixing hole is provided at the upper end of the square groove. One end of the roller (10) is stepped, and the other end has a groove. An E-type open retaining ring (11) is provided in the groove. The roller (10) is limited on the slide bar (9) through the fourth fixing hole and the E-type open retaining ring (11), and the roller (10) and the fourth fixing hole are in clearance fit.

8. The telescopic rod structure of the cleaning machine according to claim 7, characterized in that, The transmission rod (3) is located above the square groove of the slide rod (9). The bottom surface of the transmission rod (3) is inclined and cooperates with the roller (10). A limiting hole that cooperates with the transmission rod (3) is opened in the center of the top of the housing (1). The transmission rod (3) and the limiting hole are in clearance fit.

9. The telescopic rod structure of the cleaning machine according to claim 1, characterized in that, The telescopic button (4) has a groove in the center of its bottom, and the telescopic button (4) is fixed to the top of the transmission rod (3) through the groove.

10. The telescopic rod structure of the cleaning machine according to claim 9, characterized in that, The button spring (2) is located between the telescopic button (4) and the housing (1). The telescopic button (4) has limit buckles on both sides, and the housing (1) has limit grooves corresponding to the limit buckles.

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