A concealed rail profile for adjusting the level of a ladder

Abstract

The utility model discloses a hidden track section bar for adjusting the horizontal height of ladder, including section bar main part, and section bar main part includes outer frame section bar, slide rail section bar and support section bar, from cross section angle observation, the outer frame section bar includes first board, second board, third board and fourth board, and first board is symmetrical with third board and sets up apart, and first board, second board and third board are connected in proper order and constitute one and become U shape's outer frame structure, in the utility model, can through the cooperation of outer frame section bar, slide rail section bar and support section bar, the height adjustment of ladder leg is realized quickly, and it is different from the mode of adopting multistage fixed hole cooperation bolt locking or adopting the mode of laying cushion block to carry out height adjustment in prior art, and the utility model can realize stepless regulation without relying on multiple fixed hole positions, wherein the engagement of the positioning member and the rack can form stable locking at any position in the channel, greatly improving the adjustment accuracy and operation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of climbing equipment technology, specifically to a concealed track profile for adjusting the horizontal height of a ladder. Background Technology

[0002] Aluminum alloy ladders, as essential tools for modern high-altitude operations, are widely used in various scenarios such as construction, industrial maintenance, and daily household use due to their excellent properties such as lightweight, high strength, corrosion resistance, and portability. Their main body is typically made of high-strength aluminum alloy profiles, and advanced processes such as square tube extrusion and riveting are widely employed to ensure structural stability. However, although the structural design of aluminum alloy ladders is relatively mature—for example, some ladders feature double-layered rubber-wrapped anti-slip designs on the ladder feet, and are equipped with adjustable joints and widened and thickened connectors to enhance overall stability—existing technologies still fall short when applied to complex conditions commonly found in production sites, such as uneven ground, slopes, or soft surfaces, making it difficult to ensure stable support for the ladders.

[0003] Currently, most ladders use two main methods to adjust their height when facing uneven ground: adjustable feet and shims. Using shims largely depends on the operator's experience and subjective judgment, which can easily lead to mismatched shim heights and unstable support.

[0004] Most adjustable ladder legs, when requiring independent height adjustments for each leg, often suffer from limited adjustment range and difficulty in precisely controlling adjustment accuracy. This frequently results in a situation where one leg is adjusted correctly while the other still has a height difference. This not only makes the adjustment process cumbersome but can also lead to overall ladder instability, posing a significant safety hazard.

[0005] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0006] The purpose of this invention is to provide a concealed track profile for adjusting the horizontal height of a ladder.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A concealed track profile for adjusting the horizontal height of a ladder includes a profile body, the profile body including an outer frame profile, a slide rail profile, and a support profile;

[0009] Viewed from a cross-sectional perspective;

[0010] The outer frame profile includes a first plate, a second plate, a third plate, and a fourth plate. The first plate and the third plate are symmetrically arranged and spaced apart. The first plate, the second plate, and the third plate are connected in sequence to form a U-shaped outer frame structure. The fourth plate is detachably connected to the U-shaped opening of the outer frame structure to form a closed channel inside the outer frame structure.

[0011] The slide rail profile is movably connected within the channel of the outer frame structure, and the slide rail profile is configured to slide along the axial direction of the channel.

[0012] The slide rail profile includes a slide rail body movably connected in the channel of the outer frame structure. The slide rail body has a fixing groove with the opening facing the fourth plate on the inner surface of the slide rail body. The fixing groove is U-shaped and the bottom size of the fixing groove is larger than the opening size, which is used to position the rack.

[0013] The bracket profile is fixedly mounted on the fourth plate and located on the outer surface of the fourth plate. The bracket profile is U-shaped, with the U-shaped opening facing the fourth plate. A positioning member is positioned and connected to the bracket profile. The positioning member has an engaging part for passing through the fourth plate. By engaging with the rack, the slide rail body located at any position in the channel can be positioned.

[0014] In the above solution, the height of the ladder legs can be quickly adjusted by the cooperation of the outer frame profile, slide rail profile, and bracket profile. Specifically, when the height of the ladder legs does not need to be adjusted, the meshing part engages with the rack, and the slide rail body is positioned in the channel. Once the height of the ladder legs needs to be adjusted, the meshing part is first disengaged from the rack, and then the slide rail body is guided to slide along the channel so that the slide rail body is exposed in the channel. After reaching the appropriate position, the meshing part is guided to engage with the rack again to position the slide rail body in the channel.

[0015] Unlike existing technologies that often use multiple fixing holes and bolts for height adjustment or employ padding blocks, this invention achieves stepless adjustment without relying on multiple fixing holes. The engagement between the positioning element and the rack allows for stable locking at any position within the channel, significantly improving adjustment accuracy and operational efficiency, while effectively avoiding the inconvenience caused by hole limitations. The stable housing of the rack in the fixing slot, and the smooth disengagement and engagement of the positioning element with the rack, effectively enhance adjustment efficiency and operational safety.

[0016] A further technical solution is that a limiting step is provided on the opposite side surface of the first plate and the third plate, and these two limiting steps are arranged opposite to each other;

[0017] The fourth plate includes a first vertical segment, a first horizontal segment, and a second vertical segment. The first vertical segment and the second vertical segment are symmetrical and spaced apart. The extension lines of the first vertical segment and the second vertical segment in the length direction are parallel to the extension lines of the first plate and the third plate in the length direction. The first vertical segment, the first horizontal segment, and the second vertical segment are connected and combined in sequence to form a U-shaped structure. The first horizontal segment is integrally connected between the first vertical segment and the second vertical segment and is located at the same end of the two segments. When the fourth plate is set in the U-shaped opening of the outer frame structure, the ends of the first vertical segment and the second vertical segment respectively abut against the two limiting steps one by one. The outer surface of the first horizontal segment is coplanar with the plane where the edge of the U-shaped opening of the outer frame structure is located.

[0018] The fixing slot is provided on the inner surface of the first horizontal segment, and the bracket profile is provided on the outer surface of the first horizontal segment.

[0019] With the above design, the fourth plate is embedded in the U-shaped opening of the outer frame profile. The limiting step limits the ends of the first and second vertical sections, ensuring assembly stability and straightness during sliding. The fixing slot is set on the inner surface of the first horizontal section, which allows the rack to quickly engage with the meshing part. The bracket profile is fixed on the outer surface of the first horizontal section, which can simultaneously bear external forces, so that the overall structure maintains a balanced load during lifting and adjustment.

[0020] In a further technical solution, the first horizontal segment is provided with multiple square holes to guide the meshing part through the fourth plate.

[0021] With the above design, the meshing part can quickly mesh with the rack positioned in the fixed slot through the square hole.

[0022] In a further technical solution, the slide rail body includes a first horizontal plate, a second horizontal plate, a first frame, and a second frame. The first horizontal plate and the second horizontal plate are symmetrical and spaced apart. The extension lines of the first horizontal plate and the second horizontal plate in the length direction are parallel to the extension line of the first horizontal segment in the length direction. The first horizontal plate is located between the second horizontal plate and the first horizontal segment.

[0023] The first frame and the second frame are symmetrically arranged with reference to the line connecting the center of the first horizontal plate's side along its length and the center of the second horizontal plate's side along its length.

[0024] The first horizontal plate and the second horizontal plate are integrally connected between the first frame and the second frame.

[0025] With the above design, the slide rail body can be subjected to more even force during lifting and lowering, effectively avoiding jamming or wear caused by uneven loading; in particular, the symmetrical layout of the first frame and the second frame, together with the spacing design of the first horizontal plate and the second horizontal plate, further enhances the overall structural rigidity and improves the load-bearing capacity and smoothness of the slide rail body.

[0026] In a further technical solution, both the first frame and the second frame include a first vertical segment, a bending segment, a second vertical segment, and a first horizontal segment;

[0027] The first vertical segment and the second vertical segment are symmetrically arranged. The bending segment and the first horizontal segment are located between the first vertical segment and the second vertical segment. The first vertical segment, the bending segment, the second vertical segment and the first horizontal segment are connected in sequence to form a closed hollow structure. The two ends of the first vertical segment abut against the surfaces of the first horizontal segment and the second plate, respectively. The end of the second vertical segment away from the second plate abuts against the surface of the first horizontal segment.

[0028] The extension line along the length of the first vertical segment is perpendicular to the extension lines along the length of the first horizontal plate and the second horizontal plate.

[0029] The outer surface of the first vertical section is integrally connected to the first horizontal plate and the second horizontal plate;

[0030] The first vertical section on the first frame, the first horizontal plate, and the first vertical section on the second frame combine to form the fixing slot;

[0031] Both the first vertical section on the first frame and the first vertical section on the second frame have a bent portion at one end near the first horizontal section. These two bent portions are arranged opposite to each other and cooperate with each other so that the opening size of the fixing slot is smaller than the internal size of the fixing slot.

[0032] With the above design, the first vertical section on the first frame and the first vertical section on the second frame can ensure that the slide rail body will not wobble between the first horizontal section and the second plate in the channel. At the same time, the first vertical section, the bending section, the second vertical section and the first horizontal section are connected in sequence to form a closed hollow structure, which can ensure that the entire slide rail body is lightweight and strong enough, effectively improving the torsional and bending resistance. The relative arrangement of the bending part further strengthens the limiting ability of the fixing slot on the guide rail component, prevents it from falling out and ensures operational safety.

[0033] In a further technical solution, each end of the U-shaped opening of the bracket profile is provided with an extension section. Both extension sections are set opposite to each other with the U-shaped opening of the bracket profile as the starting side and are both outside the U-shaped opening.

[0034] With the above design, the bracket profile can be quickly positioned and connected to the first horizontal segment using screws.

[0035] In a further technical solution, the positioning component includes a deflection shaft passing through the bracket profile, the axis of the deflection shaft being parallel to the extension line in the length direction of the first horizontal segment, and a wrench positioned outside the bracket profile being connected to the end of the deflection shaft.

[0036] A drive sleeve is positioned and connected to the circumference of the deflection shaft. The meshing part has an approximately L-shaped structure. One end of the meshing part is positioned and connected to the drive sleeve, and the other end is set to correspond to the rack.

[0037] The deflection shaft is also provided with a torsion spring, which is configured to act on the drive sleeve so that the drive sleeve has a pushing engagement part that is always engaged with the rack.

[0038] The above design allows the positioning element to quickly disengage the meshing state between the meshing part and the rack.

[0039] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0040] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0041] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0042] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing this case.

[0043] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0044] The working principle and advantages of this utility model are as follows:

[0045] In this invention, the height of the ladder legs can be quickly adjusted by the cooperation of the outer frame profile, the slide rail profile, and the bracket profile. Specifically, when the height of the ladder legs does not need to be adjusted, the meshing part engages with the rack, and the slide rail body is positioned in the channel. Once the height of the ladder legs needs to be adjusted, the meshing part is first disengaged from the rack, and then the slide rail body is guided to slide along the channel so that the slide rail body is exposed in the channel. After reaching the appropriate position, the meshing part is guided to engage with the rack again to position the slide rail body in the channel.

[0046] Unlike existing technologies that often use multiple fixing holes and bolts for height adjustment or employ padding blocks, this invention achieves stepless adjustment without relying on multiple fixing holes. The engagement between the positioning element and the rack allows for stable locking at any position within the channel, significantly improving adjustment accuracy and operational efficiency, while effectively avoiding the inconvenience caused by hole limitations. The stable housing of the rack in the fixing slot, and the smooth disengagement and engagement of the positioning element with the rack, effectively enhance adjustment efficiency and operational safety. Attached Figure Description

[0047] Appendix Figure 1 This is a schematic diagram of the cross-sectional structure of the positioning component in this embodiment of the present invention when it is installed on the bracket profile.

[0048] Appendix Figure 2 This is a schematic diagram of the cross-sectional structure of the bracket profile in an embodiment of the present utility model;

[0049] Appendix Figure 3 This is an external view of the outer frame profile in an embodiment of this utility model;

[0050] Appendix Figure 4 This is a schematic diagram of the square hole structure in an embodiment of the present utility model;

[0051] Appendix Figure 5 This is a perspective view of the profile body in an embodiment of this utility model;

[0052] Appendix Figure 6 This is a schematic diagram of the meshing part structure in an embodiment of the present utility model.

[0053] In the attached diagrams: 1. Outer frame profile; 11. First sheet material; 12. Second sheet material; 13. Third sheet material; 14. Fourth sheet material; 15. Channel;

[0054] 111. Limiting step;

[0055] 141. First vertical segment; 142. First horizontal segment; 143. Second vertical segment; 1421. Square hole;

[0056] 2. Slide rail profile; 21. Slide rail body; 22. Fixing slot; 23. Rack;

[0057] 211. First horizontal board; 212. Second horizontal board; 213. First frame; 214. Second frame;

[0058] 2131. First vertical segment; 2132. Bending segment; 2133. Second vertical segment; 2134. First horizontal segment; 2135. Bending section;

[0059] 3. Bracket profile; 31. Extension section;

[0060] 4. Positioning component; 41. Engaging part; 42. Deflection shaft; 43. Drive sleeve; 44. Wrench; 45. Torsion spring. Detailed Implementation

[0061] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0062] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0063] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0064] See appendix Figure 1 - Figure 6 As shown, a concealed track profile for adjusting the horizontal height of a ladder includes a profile body, which includes an outer frame profile 1, a slide rail profile 2, and a support profile 3.

[0065] Viewed from a cross-sectional perspective;

[0066] The outer frame profile 1 includes a first plate 11, a second plate 12, a third plate 13, and a fourth plate 14. The first plate 11 and the third plate 13 are symmetrically arranged and spaced apart. The first plate 11, the second plate 12, and the third plate 13 are connected in sequence to form a U-shaped outer frame structure. The fourth plate 14 is detachably connected to the U-shaped opening of the outer frame structure to form a closed channel 15 inside the outer frame structure.

[0067] The slide rail profile 2 is movably connected within the channel 15 of the outer frame structure, and the slide rail profile 2 is configured to slide along the axial direction of the channel 15;

[0068] The slide rail profile 2 includes a slide rail body 21 movably connected in the channel 15 of the outer frame structure. The slide rail body 21 has a fixing groove 22 with the opening facing the fourth plate 14 on the inner surface of the slide rail body 21. The fixing groove 22 is U-shaped and the bottom size of the fixing groove 22 is larger than the opening size, which is used to position the rack 23.

[0069] The bracket profile 3 is fixedly mounted on the fourth plate 14 and located on the outer surface of the fourth plate 14. The bracket profile 3 is U-shaped, with the U-shaped opening facing the fourth plate 14. A positioning member 4 is positioned and connected to the bracket profile 3. The positioning member 4 has an engagement part 41 for passing through the fourth plate 14. Through the engagement of the engagement part 41 with the rack 23, the slide rail body 21 located at any position in the channel 15 can be positioned.

[0070] In this utility model, the fourth plate 14 is detachably connected to the U-shaped opening in the outer frame structure. The connection method at this location can be selected as screw fixing, snap-fit, or metal ring binding.

[0071] In this utility model, the shape of the slide rail profile 2 is generally fully or partially adapted to the channel 15 so that the slide rail profile 2 will not wobble in the channel 15 when it slides.

[0072] In this design, the outer frame profile 1 acts as the ladder leg, and the slide rail profile 2 acts as the auxiliary leg. Height adjustment is achieved by adjusting the extension of the auxiliary leg. Furthermore, the entire profile body can be made of aluminum alloy.

[0073] In this utility model, the positioning element 4 can be a screw, and the meshing part 41 is the pressure block at the end of the screw; the positioning element 4 can also be a gear, and the meshing part 41 is the tooth block on the gear.

[0074] In this invention, the height of the ladder legs can be quickly adjusted by the cooperation of the outer frame profile 1, the slide rail profile 2, and the bracket profile 3. Specifically, when the height of the ladder legs does not need to be adjusted, the engaging part 41 engages with the rack 23, and the slide rail body 21 is positioned in the channel 15. Once the height of the ladder legs needs to be adjusted, the engaging part 41 and the rack 23 are disengaged first, and then the slide rail body 21 is guided to slide along the channel 15 so that the slide rail body 21 is exposed in the channel 15. After reaching the appropriate position, the engaging part 41 is guided to engage with the rack 23 again to position the slide rail body 21 in the channel 15.

[0075] Unlike existing technologies that often use multiple fixing holes and bolts for height adjustment or rely on padding blocks, this invention achieves stepless adjustment without the need for multiple fixing holes. The engagement between the positioning element 4 and the rack 23 allows for stable locking at any position within the channel 15, significantly improving adjustment accuracy and operational efficiency while effectively avoiding the inconvenience caused by hole limitations. The stable housing of the rack 23 by the fixing slot 22, and the smooth disengagement and engagement of the meshing part 41 on the positioning element 4 with the rack 23, effectively enhances adjustment efficiency and operational safety.

[0076] Preferably, a limiting step 111 is provided on the opposite side surface of the first plate 11 and the third plate 13, and the two limiting steps 111 are arranged opposite to each other;

[0077] The fourth plate 14 includes a first vertical segment 141, a first horizontal segment 142, and a second vertical segment 143. The first vertical segment 141 and the second vertical segment 143 are symmetrical and spaced apart. The extension lines of the first vertical segment 141 and the second vertical segment 143 in the length direction are parallel to the extension lines of the first plate 11 and the third plate 13 in the length direction. The first vertical segment 141, the first horizontal segment 142, and the second vertical segment 143 are connected and combined in sequence to form a U-shaped structure. The first horizontal segment 142 is integrally connected between the first vertical segment 141 and the second vertical segment 143 and is located at the same end of the two segments. When the fourth plate 14 is set in the U-shaped opening of the outer frame structure, the ends of the first vertical segment 141 and the second vertical segment 143 respectively abut against the two limiting steps 111. The outer surface of the first horizontal segment 142 is coplanar with the plane where the edge of the U-shaped opening of the outer frame structure is located.

[0078] The fixing slot 22 is provided on the inner surface of the first horizontal segment 142, and the bracket profile 3 is provided on the outer surface of the first horizontal segment 142.

[0079] With the above design, the fourth plate 14 is embedded in the U-shaped opening of the outer frame profile 1. The limiting step 111 limits the ends of the first vertical section 141 and the second vertical section 143 to ensure assembly stability and straightness during sliding. The fixing slot 22 is set on the inner surface of the first horizontal section 142, which can make the rack 23 quickly engage with the meshing part 41. The bracket profile 3 is fixed on the outer surface of the first horizontal section 142, which can simultaneously bear external forces and keep the overall structure balanced during lifting and adjustment.

[0080] Preferably, the first transverse segment 142 is provided with a plurality of square holes 1421 to guide the engaging part 41 through the fourth plate 14.

[0081] With the above design, the meshing part 41 can quickly mesh with the rack 23 positioned in the fixed slot 22 through the square hole 1421.

[0082] Preferably, the slide rail body 21 includes a first horizontal plate 211, a second horizontal plate 212, a first frame 213, and a second frame 214. The first horizontal plate 211 and the second horizontal plate 212 are symmetrical and spaced apart. The extension lines of the first horizontal plate 211 and the second horizontal plate 212 in the length direction are parallel to the extension line of the first horizontal segment 142 in the length direction. The first horizontal plate 211 is located between the second horizontal plate 212 and the first horizontal segment 142.

[0083] The first frame 213 and the second frame 214 are symmetrically arranged with reference to the line connecting the center of the side of the first horizontal plate 211 in the length direction and the center of the side of the second horizontal plate 212 in the length direction.

[0084] The first horizontal plate 211 and the second horizontal plate 212 are integrally connected between the first frame 213 and the second frame 214.

[0085] With the above design, the slide rail body 21 can be subjected to more uniform force during the lifting process, effectively avoiding jamming or wear caused by uneven load; the symmetrical layout of the first frame 213 and the second frame 214, together with the spacing design of the first horizontal plate 211 and the second horizontal plate 212, further enhances the overall structural rigidity and improves the load-bearing capacity and movement stability of the slide rail body 21.

[0086] Preferably, both the first frame 213 and the second frame 214 include a first vertical segment 2131, a bent segment 2132, a second vertical segment 2133, and a first horizontal segment 2134;

[0087] The first vertical segment 2131 and the second vertical segment 2133 are symmetrically arranged. The bent segment 2132 and the first horizontal segment 2134 are located between the first vertical segment 2131 and the second vertical segment 2133. The first vertical segment 2131, the bent segment 2132, the second vertical segment 2133 and the first horizontal segment 2134 are connected in sequence to form a closed hollow structure. The two ends of the first vertical segment 2131 abut against the surfaces of the first horizontal segment 142 and the second plate 12, respectively. The end of the second vertical segment 2133 away from the second plate 12 abuts against the surface of the first horizontal segment 142.

[0088] The extension line of the first vertical segment 2131 in the length direction is perpendicular to the extension lines of the first horizontal plate 211 and the second horizontal plate 212 in the length direction;

[0089] The outer surface of the first vertical segment 2131 is integrally connected to the first horizontal plate 211 and the second horizontal plate 212;

[0090] The first vertical segment 2131 on the first frame 213, the first horizontal plate 211, and the first vertical segment 2131 on the second frame 214 are combined to form the fixing slot 22;

[0091] Both the first vertical segment 2131 on the first frame 213 and the first vertical segment 2131 on the second frame 214 have a bent portion 2135 at one end near the first horizontal segment 142. These two bent portions 2135 are arranged opposite to each other and cooperate with each other so that the opening size of the fixing slot 22 is smaller than the internal size of the fixing slot 22.

[0092] With the above design, the first vertical section 2131 on the first frame 213 and the first vertical section 2131 on the second frame 214 can ensure that the slide rail body 21 will not wobble between the first horizontal section 142 and the second plate 12 within the channel 15. At the same time, the first vertical section 2131, the bent section 2132, the second vertical section 2133, and the first horizontal section 2134 are connected in sequence to form a closed hollow structure, which can ensure that the entire slide rail body 21 is lightweight and strong enough, effectively improving its torsional and bending resistance. The relative arrangement of the bent part 2135 further strengthens the limiting ability of the fixing slot 22 on the guide rail component, preventing it from falling out and ensuring operational safety.

[0093] Preferably, each end of the U-shaped opening of the bracket profile 3 is provided with an extension section 31. The two extension sections 31 are arranged opposite each other with the U-shaped opening of the bracket profile 3 as the starting side and are both outside the U-shaped opening.

[0094] With the above design, the bracket profile 3 can be quickly positioned and connected to the first horizontal section 142 by screws.

[0095] Preferably, the positioning member 4 includes a deflection shaft 42 that passes through the bracket profile 3. The axis of the deflection shaft 42 is parallel to the extension line in the length direction of the first horizontal segment 142. A wrench 44 disposed outside the bracket profile 3 is positioned and connected to the end of the deflection shaft 42.

[0096] A drive sleeve 43 is positioned and connected to the periphery of the deflection shaft 42. The meshing part 41 has an approximately L-shaped structure. One end of the meshing part 41 is positioned and connected to the drive sleeve 43, and the other end is set to correspond to the rack 23.

[0097] The deflection shaft 42 is also provided with a torsion spring 45, which is configured to act on the drive sleeve 43 so that the drive sleeve 43 has a pushing engagement part 41 that is always engaged with the rack 23.

[0098] With the above design, the positioning member 4 can quickly disengage the meshing state between the meshing part 41 and the rack 23.

[0099] Specifically, under normal circumstances, the torsion spring 45 pushes the meshing part 41 to always maintain engagement with the rack 23, so that the rack 23 and the slide rail body 21 cannot slide out of the channel 15. Once it is necessary to extend the slide rail body 21 out of the channel 15, simply pull the slide rail body 21. Then, under the action of the pulling force, the slide rail body 21 will bring the rack 23 down. At this time, the rack 23 pushes the meshing part 41 away from the current tooth groove (that is, there are grooves between the multiple teeth on the rack 23). Then the meshing part 41 and the driving sleeve 43 will overcome the elastic force of the torsion spring 45 and rotate to disengage the current tooth groove from the meshing part 41. Then the meshing part 41 enters the next tooth groove. At this time, the torsion spring 45 releases energy and pushes the meshing part 41 to re-engage with the rack 23, realizing intermittent sliding. It should be noted that the principle here is similar to that of a cable tie, and it can only extend in one direction.

[0100] Once the slide rail body 21 needs to be retracted, turn the wrench 44. The wrench 44 drives the deflection shaft 42 to rotate, causing the drive sleeve 43 to overcome the elastic force of the torsion spring 45 and disengage from the rack 23. At this time, the slide rail body 21 can freely retract into the channel 15. After the slide rail body 21 is fully retracted, release the wrench 44. The torsion spring 45 returns to its original state, pushing the meshing part 41 to re-engage with the rack 23, achieving positioning and locking.

[0101] Working principle:

[0102] When the height of the ladder legs does not need to be adjusted, the engaging part 41 engages with the rack 23, and the slide rail body 21 is positioned within the channel 15. Once the height of the ladder legs needs to be adjusted, the slide rail body 21 is pulled. Then, under the action of the pulling force, the slide rail body 21 will bring the rack 23 down. At this time, the rack 23 pushes the engaging part 41 away from the current tooth groove. Subsequently, the engaging part 41 drives the sleeve 43 to rotate against the elastic force of the torsion spring 45 until the engaging part 41 enters the next tooth groove. At this time, the torsion spring 45 releases energy and pushes the engaging part 41 to re-engage with the rack 23, realizing intermittent sliding.

[0103] Once the slide rail body 21 needs to be retracted, turn the wrench 44. The wrench 44 drives the deflection shaft 42 to rotate, causing the drive sleeve 43 to overcome the elastic force of the torsion spring 45 and disengage from the rack 23. At this time, the slide rail body 21 can freely retract into the channel 15. After the slide rail body 21 is fully retracted, release the wrench 44. The torsion spring 45 returns to its original state, pushing the engagement part 41 to re-engage with the rack 23, achieving positioning and locking.

[0104] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A concealed track profile for adjusting the horizontal height of a ladder, characterized in that: Includes a profile body, which includes an outer frame profile (1), a slide rail profile (2), and a support profile (3); Viewed from a cross-sectional perspective; The outer frame profile (1) includes a first plate (11), a second plate (12), a third plate (13) and a fourth plate (14). The first plate (11) and the third plate (13) are symmetrical and spaced apart. The first plate (11), the second plate (12) and the third plate (13) are connected in sequence to form a U-shaped outer frame structure. The fourth plate (14) is detachably connected to the U-shaped opening of the outer frame structure so as to form a closed channel (15) inside the outer frame structure. The slide rail profile (2) is movably connected within the channel (15) of the outer frame structure, and the slide rail profile (2) is configured to slide along the axial direction of the channel (15); The slide rail profile (2) includes a slide rail body (21) movably connected in the channel (15) of the outer frame structure. The slide rail body (21) has a fixing groove (22) with the opening facing the fourth plate (14) on the inner surface of the fourth plate (14). The fixing groove (22) is U-shaped, and the bottom size of the fixing groove (22) is larger than the opening size, which is used to position the rack (23). The bracket profile (3) is fixedly mounted on the fourth plate (14) and located on the outer surface of the fourth plate (14). The bracket profile (3) is U-shaped, and the U-shaped opening of the bracket profile (3) faces the fourth plate (14). A positioning member (4) is positioned and connected on the bracket profile (3). The positioning member (4) has an engagement part (41) for passing through the fourth plate (14). Through the engagement of the engagement part (41) with the rack (23), the slide rail body (21) located at any position in the channel (15) can be positioned.

2. The concealed track profile for adjusting the horizontal height of a ladder according to claim 1, characterized in that: A limiting step (111) is provided on the opposite side surface of the first plate (11) and the third plate (13), and the two limiting steps (111) are arranged opposite to each other; The fourth board (14) includes a first vertical segment (141), a first horizontal segment (142), and a second vertical segment (143). The first vertical segment (141) and the second vertical segment (143) are symmetrical and spaced apart. The extension lines of the first vertical segment (141) and the second vertical segment (143) in the length direction are parallel to the extension lines of the first board (11) and the third board (13) in the length direction. The first vertical segment (141), the first horizontal segment (142), and the second vertical segment (143) are arranged according to... The first horizontal segment (142) is integrally connected between the first vertical segment (141) and the second vertical segment (143) and is located at the same end of the two. When the fourth plate (14) is set in the U-shaped opening of the outer frame structure, the ends of the first vertical segment (141) and the second vertical segment (143) respectively abut against the two limiting steps (111). The outer surface of the first horizontal segment (142) is coplanar with the plane where the edge of the U-shaped opening of the outer frame structure is located. The fixing slot (22) is provided on the inner surface of the first horizontal segment (142), and the bracket profile (3) is provided on the outer surface of the first horizontal segment (142).

3. The concealed track profile for adjusting the horizontal height of a ladder according to claim 2, characterized in that: The first transverse segment (142) is provided with a plurality of square holes (1421) to guide the meshing part (41) through the fourth plate (14).

4. The concealed track profile for adjusting the horizontal height of a ladder according to claim 2, characterized in that: The slide rail body (21) includes a first horizontal plate (211), a second horizontal plate (212), a first frame (213), and a second frame (214). The first horizontal plate (211) and the second horizontal plate (212) are symmetrical and spaced apart. The extension lines of the first horizontal plate (211) and the second horizontal plate (212) in the length direction are parallel to the extension line of the first horizontal segment (142) in the length direction. The first horizontal plate (211) is located between the second horizontal plate (212) and the first horizontal segment (142). The first frame (213) and the second frame (214) are symmetrically arranged with reference to the line connecting the center of the side of the first horizontal plate (211) in the length direction and the center of the side of the second horizontal plate (212) in the length direction; The first horizontal plate (211) and the second horizontal plate (212) are integrally connected between the first frame (213) and the second frame (214).

5. The concealed track profile for adjusting the horizontal height of a ladder according to claim 4, characterized in that: Both the first frame (213) and the second frame (214) include a first vertical segment (2131), a bending segment (2132), a second vertical segment (2133), and a first horizontal segment (2134). The first vertical segment (2131) and the second vertical segment (2133) are symmetrically arranged. The bent segment (2132) and the first horizontal segment (2134) are located between the first vertical segment (2131) and the second vertical segment (2133). The first vertical segment (2131), the bent segment (2132), the second vertical segment (2133) and the first horizontal segment (2134) are connected in sequence to form a closed hollow structure. The two ends of the first vertical segment (2131) abut against the surfaces of the first horizontal segment (142) and the second plate (12) respectively. The end of the second vertical segment (2133) away from the second plate (12) abuts against the surface of the first horizontal segment (142). The extension line of the first vertical segment (2131) in the length direction is perpendicular to the extension lines of the first horizontal plate (211) and the second horizontal plate (212) in the length direction; The outer surface of the first vertical section (2131) is integrally connected to the first horizontal plate (211) and the second horizontal plate (212); The first vertical segment (2131) on the first frame (213), the first horizontal plate (211), and the first vertical segment (2131) on the second frame (214) combine to form the fixing slot (22). The first vertical section (2131) on the first frame (213) and the first vertical section (2131) on the second frame (214) are both provided with a bent part (2135) at one end near the first horizontal section (142). The two bent parts (2135) are arranged opposite to each other and cooperate with each other so that the slot size of the fixed slot (22) is smaller than the internal size of the fixed slot (22).

6. The concealed track profile for adjusting the horizontal height of a ladder according to claim 1, characterized in that: The bracket profile (3) has an extension section (31) at each end of the U-shaped opening. Both extension sections (31) are set opposite to each other with the U-shaped opening of the bracket profile (3) as the starting side and are both outside the U-shaped opening.

7. The concealed track profile for adjusting the horizontal height of a ladder according to claim 2, characterized in that: The positioning component (4) includes a deflection shaft (42) that passes through the bracket profile (3). The axis of the deflection shaft (42) is parallel to the extension line in the length direction of the first horizontal segment (142). A wrench (44) is positioned and connected to the end of the deflection shaft (42) outside the bracket profile (3). A drive sleeve (43) is positioned and connected to the circumference of the deflection shaft (42). The meshing part (41) has an approximately L-shaped structure. One end of the meshing part (41) is positioned and connected to the drive sleeve (43), and the other end is set to correspond to the rack (23). The deflection shaft (42) is also provided with a torsion spring (45), which is configured to act on the drive sleeve (43) so that the drive sleeve (43) has a pushing engagement part (41) that is always engaged with the rack (23).

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