Ground clearance adjustment device for a tailgate and tailgate

Abstract

The utility model provides a kind of height adjustment device for hanging door and hanging door for hanging door, including hanging box, horizontal pull support, vertical connecting support, screw adjusting part and connecting shaft;Wherein, the bottom of hanging box is used to connect door body, and the middle part of hanging box is formed with placing groove;Limiting groove is formed in the top of placing groove of hanging box;Threaded hole is formed on the adjusting side end plate of hanging box;The first main body side plate of hanging box is formed with vertical slot hole, and horizontal pull support is formed with oblique slot hole, the bottom of vertical connecting support is formed with shaft hole, and connecting shaft is arranged along second direction and is arranged in vertical slot hole, oblique slot hole and shaft hole;One side of horizontal pull support is formed with adjusting part connecting part, so that it can be moved horizontally in placing groove by the rotary motion of itself. The utility model can make hanging wheel assembly not need integrated lifting function, and the design complexity is greatly reduced;Device is located in the open area below the top of door body, and the convenience of door body height adjustment operation is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of furniture hardware technology, and in particular to a device for adjusting the ground height of a sliding door and a sliding door itself. Background Technology

[0002] Sliding doors, as a type of door structure without a ground track and with a large opening space, are widely used in homes, commercial and industrial places. Their core performance depends on the precise control of the door's height from the ground. It is necessary to ensure that there is no friction or interference between the door and the ground when it slides, and to compensate for installation errors or uneven ground through height adjustment.

[0003] Currently, most mainstream sliding door lifting and adjustment solutions in the industry adopt a direct screw drive structure. The core principle is: by setting a vertical screw in the hanging wheel assembly or at the top of the door, with the lower end of the screw connected to the door or load-bearing component, the vertical lifting and lowering of the door is achieved through screw drive when the screw is rotated. However, this type of structure has the following significant drawbacks in practical applications: (1) The screw needs to be arranged vertically inside the hanging wheel assembly or in the narrow space at the top of the door, which means that the threaded hole and the connecting parts need to be precisely aligned during assembly, making the process complicated; adjustment requires climbing to operate, and the operating space is limited by the structure of the hanging rail and ceiling, making it difficult for ordinary users to complete independently, resulting in high maintenance costs.

[0004] (2) The screw directly bears the weight of the door body. After long-term use, the screw is prone to wear and bending deformation, which can cause the lifting to be stuck or the height to deviate. Moreover, the gap of the screw drive can cause adjustment lag, making it difficult to achieve high-precision positioning. The door body is prone to friction with the ground or excessive gap.

[0005] (3) The screw structure needs to be integrated with the hanging wheel assembly, which makes the hanging wheel assembly structure complex and difficult to process, and cannot be flexibly adapted to different specifications of doors. For heavy doors (such as heavy commercial metal doors and industrial sliding doors), the load-bearing capacity of a single screw is limited, and the multi-screw layout will further increase the structural complexity and assembly difficulty.

[0006] (4) The screw and the threaded hole are susceptible to dust and moisture corrosion, which can cause the threads to rust and jam. After damage, the entire hanging wheel assembly or door body needs to be disassembled for replacement. The maintenance process is complicated and can easily cause secondary damage to the door body. At the same time, the threaded drive has no redundant design, and a single component failure can cause the lifting function to fail.

[0007] (5) The arrangement of vertical screws requires a lot of space inside the hanging wheel assembly, which limits the lightweight design of the hanging wheel assembly; exposed screws will also affect the aesthetics of the top of the door, requiring additional decorative cover plates, which increases costs and assembly procedures.

[0008] In view of the shortcomings of the existing technology, there is an urgent need for a sliding door height adjustment device that is simple in structure, easy to operate, precise in transmission, and widely adaptable, so as to solve the core problems of the screw-type lifting structure, such as spatial constraints, inconvenient operation, and poor stability. Utility Model Content

[0009] In view of this, the present invention provides a device for adjusting the ground height of a sliding door and a sliding door, so as to eliminate or improve one or more defects existing in the prior art.

[0010] One aspect of this utility model provides a device for adjusting the ground height of a sliding door, comprising: a hanging box, a horizontal pull bracket, a vertical connecting bracket, a threaded adjusting component, and a connecting shaft; The hanging box has a bottom for connecting to the door body, a placement groove extending along a first direction (the length direction of the hanging box) in the middle, a limiting groove for a vertical connecting bracket to extend into at the top of the placement groove, an adjusting side plate with a threaded hole projected through the adjusting side plate in the first direction, a first main body side plate extending along the first direction with a vertical slot, a horizontal bracing with an oblique slot, and a shaft hole at the bottom of the vertical connecting bracket. The connecting shaft is arranged along a second direction and passes through the vertical slot and the oblique slot. In the slot and shaft hole, the second direction is the width direction of the hanging box; the horizontal pull bracket has an adjusting member connecting part on the side near the adjusting side end plate, which is used to keep it fixedly connected with the threaded adjusting member in the first direction, so that the threaded adjusting member can drive the horizontal pull bracket to move laterally in the placement slot through its own rotational movement; in the state of the horizontal pull bracket moving laterally, the top of the horizontal pull bracket abuts against the top wall of the placement slot, and the side of the vertical connecting bracket abuts against the side wall of the limiting slot in the lateral movement direction. The horizontal pull bracket drives the connecting shaft to slide in the vertical slot and the oblique slot to realize the lifting and lowering of the hanging box relative to the vertical connecting bracket.

[0011] In some embodiments, the outer end of the threaded adjusting member is formed with an operating part for controlling the threaded adjusting member to rotate forward or backward; the inner end of the threaded adjusting member is formed with a bracket connecting part, and the adjusting member connecting part is directly connected to the bracket connecting part or connected through a pin.

[0012] In some embodiments, the threaded hole of the adjusting side end plate of the hanging box is horizontally arranged along a first direction; The adjusting part of the horizontal brace has a vertical connecting groove, and the bracket connecting part of the threaded adjusting part is connected in the vertical connecting groove by a self-formed flange or pin.

[0013] In some embodiments, the horizontal bracing has a U-shaped structure and two parallel second main body side plates, such that the vertical connecting bracket is installed between the two second main body side plates; The cross brace also has a central base plate located on the side of the cross brace away from the adjustment side end plate, and the central base plate is connected to two second main body side plates.

[0014] In some embodiments, the central base plate of the horizontal bracing bracket and the two second main body side plates are integrally formed. The junction of the central base plate and the two second main body side plates is elastic, so that the two second main body side plates can be opened in a second direction on one side of the vertical connecting groove to insert the flange formed by the bracket connecting part of the threaded adjustment member.

[0015] In some embodiments, the flange formed by the bracket connection portion of the threaded adjustment member is a flange column structure, and the contact surface between the flange and the vertical connecting groove is configured as a plane.

[0016] In some embodiments, the hanging box includes a separate box body and a core body, the cavity of the box body is disposed through a first direction, and the core body is embedded in the box body; the placement groove, the vertical slot and the adjustment member connection portion are formed in the core body; the limiting groove is formed in the top of the box body; the bottom of the box body has connection portions for connecting to the door frame or the door body on both sides in a second direction.

[0017] In some embodiments, the horizontal pull bracket is restricted to moving only along the first direction within the placement slot of the hanging box; or, the hanging box has two or more vertical slots, the horizontal pull bracket has a corresponding number of oblique slots, and the vertical connecting bracket has a corresponding number of shaft holes, which are respectively connected by a corresponding number of connecting shafts.

[0018] In some embodiments, the shaft segment connecting the connecting shaft to the vertical connecting bracket is provided with an anti-loosening structure, which includes a knurled or interference fit structure.

[0019] Another aspect of this utility model provides a sliding door, including the aforementioned ground height adjustment device for a sliding door.

[0020] The external design of the ground clearance height adjustment device in this embodiment eliminates the need for the lifting wheel assembly inside the hanging rail to integrate lifting functions, significantly reducing design complexity, processing difficulty, and production costs. The device is located in an open area at the top of the door and below the hanging rail, with the operating part exposed (not located inside the hanging rail), allowing adjustment to be completed without disassembling the hanging rail or door components, greatly improving convenience and safety. This invention, through a precise transmission structure of oblique slots, vertical slots, and connecting shafts, ensures accurate and controllable door height adjustment, preventing door sagging or friction with the ground. The bidirectional constraint design of the horizontal support top abutting and the vertical connecting support side limiting prevents movement deviation, ensuring a smooth, noiseless, and stable lifting process, maintaining stable performance even after long-term use.

[0021] Additional advantages, objects, and features of this invention will be set forth in part in the description which follows, and will in part become apparent to those skilled in the art upon review of the description, or may be learned by practice of the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures specifically pointed out in the description and drawings.

[0022] Those skilled in the art will understand that the objectives and advantages achievable with this invention are not limited to those specifically described above, and that the above and other objectives achievable with this invention will become clearer from the following detailed description. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, do not constitute a limitation thereof. The components in the drawings are not drawn to scale but are merely for illustrating the principles of the present invention. For ease of illustration and description of certain parts of the present invention, corresponding portions in the drawings may be enlarged, i.e., may appear larger relative to other components in an exemplary device actually manufactured according to the present invention.

[0024] Figure 1 This is a schematic diagram of the structure of the sliding door and the height adjustment device above the ground in one embodiment of the present invention.

[0025] Figure 2 for Figure 1 A partial enlarged view of the central section, with a cross-sectional view of part of the hanging rails and the housing of the ground clearance adjustment device.

[0026] Figure 3 This is a schematic diagram of the ground clearance adjustment device in one embodiment of the present invention.

[0027] Figure 4 This is an exploded view of the ground clearance adjustment device in one embodiment of the present invention.

[0028] Figure 5 This is a top view of the ground clearance adjustment device in one embodiment of the present invention.

[0029] Figure 6 for Figure 5 Sectional view of plane AA.

[0030] Figure 7 This is a schematic diagram of the hanging box of the ground height adjustment device in a higher position according to one embodiment of the present invention.

[0031] Figure 8 for Figure 7 The diagram shows the hanging box lowered relative to the vertical connecting bracket.

[0032] Figure 9 This is a half-sectional view of the hanging box in one embodiment of the present utility model.

[0033] Figure label: 1. Hanging box; 11. Box body; 113. Connecting part; 114. Limiting protrusion; 12. Core; 101. Placement groove; 102. Limiting groove; 103. Groove top wall; 121. First main body side plate; 122. Vertical slot hole; 123. Adjustment side end plate; 124. Threaded hole; 125. Fastening hole; 2. Horizontal bracing; 210. Second main body side plate; 211. Angled slot; 212. Vertical connecting slot; 220. Middle base plate; 3. Vertical connecting bracket; 301, shaft hole; 4. Threaded adjusting element; 410. Operating part; 420. Threaded section; 430. Flange; 5. Connecting shaft; 501. Knurled finish; 502. Optical shaft section; 6. Hanging wheel assembly; 7. Hanging rail; 8. Gantry frame. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.

[0035] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0036] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, element, step, or component, but does not exclude the presence or addition of one or more other features, elements, steps, or components.

[0037] It should also be noted that, unless otherwise specified, the term "connection" in this article can refer not only to a direct connection, but also to an indirect connection involving an intermediary.

[0038] In the following description, embodiments of the present invention will be illustrated with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar parts, or the same or similar steps.

[0039] This utility model provides a device for adjusting the ground height of a sliding door and a sliding door itself, such as... Figure 1 and Figure 2 As shown, the ground clearance adjustment device can be directly installed on the top of the door and below the hanging rail 7, avoiding the structural complexity and inconvenience of traditional devices that place the lifting device inside the hanging rail 7. This utility model's ground clearance adjustment device, through its innovative external layout design, not only ensures precise transmission but also completely solves the industry pain points of complex structure and inconvenient operation inherent in traditional built-in devices. It combines practicality, economy, and adaptability, providing a superior solution for adjusting the height of sliding doors and possessing broad market promotion value.

[0040] Figure 1 This is a schematic diagram of the structure of a sliding door and a height adjustment device according to an embodiment of the present invention. The diagram only shows the height adjustment device on one side of the sliding door. The number of height adjustment devices can be selected according to the specific length of the sliding door, such as two, three or more in its length direction. It is understood that the position of the height adjustment device at the top of the sliding door can also be set according to the actual situation, such as being located on both sides or in the middle of the sliding door.

[0041] Figure 2 for Figure 1 A partial enlarged view of the central section, with a cross-sectional view of part of the hanging rail 7 and the housing 11 of the ground height adjustment device. In one implementation, the bottom of the housing 11 of the ground height adjustment device can be fixedly connected to the top of the door frame 8; while the top of the ground height adjustment device is fixedly connected to the hanging wheel assembly 6 via a vertical connecting bracket 3.

[0042] One aspect of this utility model provides a device for adjusting the ground height of a sliding door, such as... Figures 3-6 As shown, the ground clearance adjustment device (hereinafter referred to as the device) includes: a hanging box 1, a horizontal support bracket 2, a vertical connecting bracket 3, a threaded adjustment component 4, and a connecting shaft 5, etc.

[0043] The hanging box 1 is the main structure of the device, serving the dual function of supporting the door and housing internal components. The bottom of the hanging box 1 is used to connect to the door; if a bolted or snap-fit ​​connection is used, power can be directly transmitted, causing the door to move synchronously. As at least one possible implementation, the bottom of the hanging box 1 has connecting portions 113 protruding along its width on both sides, which can be directly inserted into the slide rails at the top of the door frame 8, and then fixed in the fastening holes 125 on the side using threaded connectors, thus achieving a fixed connection between the tensioned hanging box 1 and the top of the door frame 8. Figure 3 or Figure 4 As shown, the bottom outer side of the hanging box 1 is also provided with a limiting protrusion 114, which can be abutted against the outer edge of the slide rail above the gantry 8 for positioning and to simplify the installation process.

[0044] Furthermore, a placement groove 101 extending along a first direction is formed in the middle of the hanging box 1; this groove is used to accommodate the horizontal support 2. The length of the placement groove 101 is greater than that of the horizontal support 2, providing sufficient travel for its lateral movement. A limiting groove 102 is formed at the top of the placement groove 101 for the vertical connecting support 3 to extend into; the lateral displacement of the vertical connecting support 3 is constrained by the sidewall of the limiting groove 102, ensuring that it maintains a vertically fixed posture.

[0045] Furthermore, the hanging box 1 has an adjusting side end plate 123, on which a threaded hole 124 is formed. The projection of the threaded hole 124 in the first direction passes through the adjusting side end plate 123, and the axial direction can be consistent with the first direction. This provides a mounting and engagement base for the threaded adjustment component 4, and the position of the threaded hole 124 is adapted to the operating space at the top of the door, making it easy to apply force directly.

[0046] Furthermore, the hanging box 1 has a first main body side plate 121 extending along a first direction, the first main body side plate 121 forming a vertical slot 122, the horizontal support bracket 2 forming an oblique slot 211, the bottom of the vertical connecting bracket 3 forming a shaft hole 301, and the connecting shaft 5 arranged along a second direction and passing through the vertical slot 122, the oblique slot 211 and the shaft hole 301, the second direction being the width direction of the hanging box 1.

[0047] In this embodiment of the invention, the horizontal support bracket 2 is assembled in the placement slot 101 of the hanging box 1, with its top abutting against the top wall 103 of the placement slot 101 to form a stable support. The inclination angle of the inclined slot 211 of the horizontal support bracket 2 is precisely matched with the vertical slot 122, and the lateral movement can be converted into vertical driving force through the inclined structure.

[0048] Furthermore, the horizontal bracing 2 has an adjusting member connecting part 113 formed on the side near the adjusting side end plate 123, which is used to maintain a fixed connection with the threaded adjusting member 4 in the first direction, so that the threaded adjusting member 4 can drive the horizontal bracing 2 to move laterally in the placement groove 101 through its own rotational movement.

[0049] In this embodiment of the invention, the upper part of the vertical connecting bracket 3 is fixedly connected to the hanging wheel assembly 6, and the lower part extends into the limiting groove 102 of the hanging box 1, with its side abutting against the side wall of the limiting groove 102, forming a bidirectional limiting. A shaft hole 301 is formed at the bottom of the vertical connecting bracket 3 for the connecting shaft 5 to pass through, forming a linkage structure with the horizontal pull bracket 2 and the hanging box 1 through the connecting shaft 5. The vertical connecting bracket 3 serves as a fixed reference component, and its position slides synchronously with the hanging wheel assembly 6 (without affecting the opening and closing of the door). The hanging box 1 adjusts the door height by raising and lowering relative to the vertical connecting bracket 3.

[0050] When the horizontal support 2 is in a horizontally moving state, the top of the horizontal support 2 abuts against the top wall 103 of the placement slot 101, and the side of the vertical connecting support 3 abuts against the side wall of the limiting slot 102 in the horizontal moving direction. The horizontal support 2 drives the connecting shaft 5 to slide in the vertical slot 122 and the oblique slot 211 to realize the lifting and lowering of the hanging box 1 relative to the vertical connecting support 3.

[0051] The external design of the ground clearance adjustment device in this embodiment eliminates the need for the lifting wheel assembly 6 inside the hanging rail 7 to integrate lifting functions, significantly reducing design complexity, processing difficulty, and production costs. The device is located in an open area at the top of the door and below the hanging rail 7, with the operating part 410 exposed (not located inside the hanging rail 7). Adjustment can be completed without disassembling the hanging rail 7 or door components, greatly improving convenience and safety. The precise transmission structure of the oblique slot 211, vertical slot 122, and connecting shaft 5 ensures accurate and controllable door height adjustment, preventing door sagging or friction with the ground. The bidirectional constraint design of the horizontal support 2 (top abutment) and the vertical connecting support 3 (side limit) prevents movement deviation, ensuring smooth, noiseless, and stable performance even after long-term use.

[0052] The ground clearance adjustment device in this embodiment is not limited by the internal space of the hanging rail 7, and can be adapted to various specifications of hanging rail 7 (such as embedded and exposed hanging rail 7), and is compatible with light to heavy doors (such as home glass doors and commercial large-size metal doors); the external layout facilitates later upgrades and renovations, and can be directly installed on the top of the existing sliding door without replacing the hanging rail 7 or the hanging wheel assembly 6, and has strong adaptability.

[0053] The ground height adjustment device and the sliding door using the device in this embodiment are suitable for home scenarios such as balcony, kitchen, and bathroom sliding doors, especially suitable for environments with limited ceiling space (such as those with suspended ceilings) or where it is inconvenient to climb to operate; they are also suitable for commercial scenarios such as large-size glass sliding doors in shopping malls, office buildings, and hotels, making it easy for staff to quickly adjust the door height to adapt to different passage needs; they are also suitable for upgrading and transforming the lifting function of existing sliding doors, without the need to replace the entire door, simply by adding this device to achieve convenient adjustment and reduce transformation costs.

[0054] In some embodiments, such as Figure 2 and Figure 6 As shown, the outer end of the threaded adjusting member 4 has an operating part 410 for controlling the forward or reverse rotation of the threaded adjusting member 4. The operating part 410 can adopt a standardized structural design, such as adapting to conventional operating forms like internal hexagonal heads, external hexagonal heads, Phillips head slots, or slotted heads, allowing rotation operations to be completed without special tools, thus lowering the barrier to entry. The middle part of the threaded adjusting member 4 is the threaded section 420, which is adapted to the threaded hole 124.

[0055] Furthermore, the inner end of the threaded adjusting component 4 forms a bracket connecting part, which is directly connected to the bracket connecting part or connected via a pin. Direct connection refers to an interference fit or snap-fit ​​method, forming a rigid linkage structure between the adjusting component connecting part and the bracket connecting part. For example, using a snap-fit ​​with a slot ensures no relative displacement after assembly. This method offers advantages such as compact structure, high transmission efficiency, and no power transmission loss, making it suitable for space-constrained or light-to-medium load scenarios. Pin connection refers to a rotatable hinge structure formed by a pin passing through corresponding holes in the adjusting component connecting part and the bracket connecting part. The pin and hole use a clearance fit, allowing for slight angular compensation during transmission, accommodating positional deviations caused by assembly errors or force deformation, and preventing transmission jamming. Simultaneously, this connection method facilitates disassembly, enabling later maintenance and component replacement, making it suitable for heavy loads or scenarios requiring frequent adjustments.

[0056] In some embodiments, such as Figure 6 As shown, the threaded hole 124 of the adjusting end plate 123 of the hanging box 1 is horizontally arranged along the first direction. This design allows the threaded adjusting member 4 to be installed horizontally, and the operating part 410 is directly exposed on the side of the hanging box 1 without tilting to avoid space, further optimizing the ease of operation. At the same time, the horizontally arranged threaded hole 124 ensures that the axial force of the threaded adjusting member 4 is transmitted entirely along the first direction, reducing the lateral component force and improving transmission efficiency and structural stability. The threaded hole 124 of the adjusting end plate 123 of the hanging box 1 can be a countersunk hole structure, that is, the outer hole section is a smooth hole and the inner hole section is a threaded hole.

[0057] Furthermore, the adjusting member connecting part of the horizontal brace 2 is formed with a vertical connecting groove 212, and the bracket connecting part of the threaded adjusting member 4 is connected in the vertical connecting groove 212 by a self-formed flange 430 or a pin. The groove body of the vertical connecting groove 212 extends vertically, and the groove width is precisely matched with the size of the bracket connecting part of the threaded adjusting member 4, leaving a reasonable assembly and sliding clearance.

[0058] In some embodiments, such as Figure 4 As shown, the horizontal bracing 2 has a U-shaped structure with two parallel second main body side plates 210, so that the vertical connecting bracket 3 is installed between the two second main body side plates 210. The horizontal bracing 2 also has a central base plate 220, which is located on the side of the horizontal bracing 2 away from the adjusting end plate 123, and the central base plate 220 is connected to the two second main body side plates 210. Compared with a single-sided bracket structure, the U-shaped structure provides smoother power transmission, disperses local stress during transmission, and improves structural durability.

[0059] In this embodiment, the horizontal support bracket 2 adopts a U-shaped integrated structure design. The core consists of two parallel second main body side plates 210 and a central base plate 220, forming a frame structure adapted to the installation and power transmission of the vertical connecting bracket 3. The two second main body side plates 210 of the U-shaped structure can form a bidirectional clamping limit on the vertical connecting bracket 3. Together with the side wall constraint of the limiting groove 102 of the hanging box 1, the lateral displacement of the vertical connecting bracket 3 is restricted from both the inside and outside, ensuring that it always maintains a precise fit with the connecting shaft 5 and the slot during the lifting process, avoiding transmission jamming or component wear caused by misalignment.

[0060] In some embodiments, the central base plate 220 of the horizontal bracing 2 and the two second main body side plates 210 are integrally formed. The junction of the central base plate 220 and the two second main body side plates 210 is elastic, allowing the two second main body side plates 210 to be opened in a second direction on one side of the vertical connecting groove 212 to accommodate the flange 430 formed by the bracket connecting part of the threaded adjusting member 4. The integrally formed structure reduces the assembly gap of the split design, has strong overall torsional and bending resistance, and can effectively withstand the load impact during lateral movement, avoiding structural deformation caused by long-term use. The elastic junction only deforms during assembly and remains rigid in the working state, which does not affect the power transmission accuracy and can accommodate assembly errors and vibration impacts through small elastic deformation, thereby improving the structural fault tolerance rate.

[0061] In this embodiment, the junction between the central substrate 220 and the two second main body side plates 210 can be designed with elastic optimization, which can be achieved through material or structural optimization. The material referred to here is one with good elastic recovery properties (such as spring steel or reinforced elastic plastic), utilizing the inherent toughness of the material to give the junction deformability. The structural optimization refers to designing the junction as a thin connecting section or a rounded transition structure to reduce rigid constraints in this area, allowing the two second main body side plates 210 to slightly expand outward along the second direction when subjected to force, and to quickly return to their original position after the external force is removed.

[0062] In some embodiments, such as Figure 4 or Figure 6 As shown, the flange 430 formed by the bracket connection of the threaded adjusting component 4 has a flange column structure, and the contact surface between the flange 430 and the vertical connecting groove 212 is configured as a plane. The plane contact ensures that the force is evenly distributed across the entire contact surface, without local stress concentration, and avoids deformation of the flange 430 or the vertical connecting groove 212 due to uneven force. The horizontal driving force is efficiently transmitted to the horizontal support 2 through the surface contact, driving the horizontal support 2 to move laterally along the first direction. Then, through the cooperation of the oblique slot 211 and the connecting shaft 5, the hanging box 1 and the door are raised and lowered smoothly.

[0063] In some embodiments, such as Figure 4 , Figure 6 and Figure 9 As shown, the hanging box 1 includes a separate box body 11 and a core body 12. The cavity of the box body 11 is through-hole along a first direction, and the core body 12 is embedded in the box body 11. The placement groove 101, the vertical slot 122, and the adjusting member connecting part are formed in the core body 12; the limiting groove 102 is formed on the top of the box body 11; the bottom of the box body 11 has connecting parts on both sides in a second direction for connecting the door frame 8 or the door body.

[0064] The box body 11 serves as the external support and connection body, and has an overall frame structure. The internal cavity is set through along the first direction (the length direction of the hanging box 1) to provide an embedded installation space for the core body 12. The top is formed with a limiting groove 102 for the vertical connecting bracket 3 to extend into and form a lateral limit. The bottom extends to both sides in the second direction (the width direction of the hanging box 1) to form connecting parts 113 (such as bolt holes, buckle seats, welding ear plates, etc.), which are used to fix and connect with the gantry 8 or the top of the door to directly transmit lifting power.

[0065] The core 12, serving as the internal transmission core module, is an integrated structure adapted to the cavity of the box 11. After being embedded in the box 11, it can be fixed by positioning structures (such as pins, slots, and bolts) to prevent relative displacement. The core 12 integrates a placement groove 101, a vertical slot 122, and an adjusting component connection part. The placement groove 101 extends along the first direction to accommodate the horizontal support bracket 2. The vertical slot 122 is formed on the two first main body side plates 121 of the core 12 in the second direction, providing vertical sliding guidance for the connecting shaft 5. The adjusting component connection part is adapted to the vertical connecting groove 212 of the horizontal support bracket 2 to achieve linkage with the threaded adjusting component 4. The fastening hole 125 formed at the bottom of the outer end of the core 12 in the first direction can be inclined. For example, the tension connection of the hanging box 1 in the sliding groove at the top of the gantry can be achieved by using a set screw. The limiting protrusion 114 protrudes downward, which can achieve quick positioning of the hanging box 1 and facilitate the installation process.

[0066] In some embodiments, the horizontal support 2 is restricted to moving only along the first direction within the placement slot 101 of the hanging box 1; optionally, the shape of the horizontal support 2 is adapted to the placement slot 101 (such as a rectangular cross-section fit) to form an all-round motion constraint, ensuring that the horizontal support 2 can only move in a pure straight line along the first direction.

[0067] Furthermore, such as Figure 4 or Figure 6 As shown, the hanging box 1 has two or more vertical slots 122, the horizontal support 2 has a corresponding number of oblique slots 211, and the vertical connecting support 3 has a corresponding number of shaft holes 301, which are connected by a corresponding number of connecting shafts 5. Each connecting shaft 5 is constrained by the corresponding vertical slot 122 and can only slide in the vertical direction, converting the lateral force transmitted by the oblique slot 211 into a vertical driving force, which drives the hanging box 1 (and the door body) to rise and fall smoothly. Multiple sets of connecting shafts 5 evenly distribute the weight of the door body and the running load, so that the force on each part of the vertical connecting support 3 is balanced, avoiding tilting, jamming or excessive wear of parts caused by unilateral force.

[0068] In some embodiments, the shaft segment connecting the connecting shaft 5 and the vertical connecting bracket 3 is provided with an anti-loosening structure. The anti-loosening structure includes knurling 501 or an interference fit structure, which can suppress relative loosening under long-term vibration, frequent transmission and door self-weight load, and ensure that the connecting shaft 5 and the vertical connecting bracket 3 move synchronously, avoiding power transmission lag, component collision wear or reduced lifting accuracy.

[0069] Optionally, such as Figure 4As shown, a regular knurled pattern (such as straight lines, mesh, or diamond patterns) is machined on the outer periphery (middle part) of the shaft section where the connecting shaft 5 mates with the shaft hole 301 of the vertical connecting bracket 3. After knurling 501, the actual outer diameter of the shaft section is slightly larger than the inner diameter of the shaft hole 301 of the vertical connecting bracket 3. During assembly, the raised part of the knurled pattern engages with the inner wall of the shaft hole 301, which both breaks the smooth surface of the inner wall of the shaft hole 301 to form a mechanical lock and generates continuous radial friction through the interference fit structure, achieving anti-loosening and fixing through a dual action.

[0070] Both ends of the connecting shaft 5 are designed as smooth shaft sections 502, i.e., smooth cylindrical surfaces without threads or knurling 501, ensuring smooth sliding. The diameter of the smooth shaft section 502 and each mating hole adopt a clearance fit design. The smooth surface of the smooth shaft section 502 and the precise clearance fit result in a low coefficient of friction between the connecting shaft 5 and each slot and shaft hole 301, making the rotation operation of the threaded adjustment part 4 less strenuous, and ensuring a smooth, jam-free, and noiseless door lifting process.

[0071] Another aspect of this utility model provides a sliding door, including the aforementioned ground height adjustment device for a sliding door.

[0072] like Figure 1 and Figure 2 As shown, the sliding door of this utility model can adopt a modular assembly design, mainly consisting of a hanging rail 7, a hanging wheel assembly 6, a door body (including a door frame 8), and the aforementioned ground height adjustment device.

[0073] The hanging rail 7 is fixed to the top of the building and provides a sliding track for the hanging wheel assembly 6. Its structural design only needs to meet the functions of suspension and sliding, without the need to integrate a complex lifting mechanism. The structure is simple and the processing cost is low. Sufficient space is reserved below the hanging rail 7 to accommodate the external installation requirements of the ground height adjustment device.

[0074] As the core component for door suspension and sliding, the hanging wheel assembly 6 rolls with the hanging rail 7 through the pulley mechanism. Its lower part is fixedly connected to the vertical connecting bracket 3 of the ground height adjustment device, bearing the weight of the door and realizing the left and right opening and closing sliding of the door. Its structure is lightweight and has stable load-bearing capacity.

[0075] The door body is the main functional component of the sliding door, and the door frame 8 serves as the supporting frame, adaptable to different door panels such as glass, metal, and wood. The top of the door body is fixed to the bottom of the mounting box 1 of the ground height adjustment device (e.g., by bolting or snap-fitting), and the door body's ground height is adjusted by raising and lowering the mounting box 1. The ground height adjustment device is installed in the open area between the top of the door body and the hanging rail 7, and is the core module for achieving precise adjustment of the door body height, solving the pain points of inconvenient operation and complex structure of traditional built-in devices.

[0076] This sliding door, through the integration of an innovative ground clearance adjustment device, fundamentally solves the industry pain points of traditional sliding doors, such as inconvenient adjustment, complex structure, and unstable operation. It combines convenience, reliability, adaptability, and economy, providing a better solution for sliding door applications in different scenarios, and has significant market promotion value and practical significance.

[0077] In this invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or in place of features of other embodiments.

[0078] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. For those skilled in the art, various modifications and variations can be made to the embodiments of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for adjusting the ground height of a sliding door, characterized in that, include: Hanging box (1), horizontal support bracket (2), vertical connecting bracket (3), threaded adjustment component (4) and connecting shaft (5); The bottom of the hanging box (1) is used to connect the door body, and a placement groove (101) extending along the first direction is formed in the middle of the hanging box (1). The first direction is the length direction of the hanging box (1). The hanging box (1) has a limiting groove (102) formed on the top of the placement groove (101) for the vertical connecting bracket (3) to extend into. The hanging box (1) has an adjusting side end plate (123), and a threaded hole (124) is formed on the adjusting side end plate (123). The projection of the threaded hole (124) in the first direction passes through the adjusting side end plate (123). The hanging box (1) has a first main body side plate (121) extending along a first direction. The first main body side plate (121) has a vertical slot (122). The horizontal bracing (2) has an oblique slot (211). The bottom of the vertical connecting bracket (3) has a shaft hole (301). The connecting shaft (5) is arranged along a second direction and passes through the vertical slot (122), the oblique slot (211) and the shaft hole (301). The second direction is the width direction of the hanging box (1). The horizontal bracing bracket (2) has an adjustment member connection part on the side near the adjustment side end plate (123) for maintaining a fixed connection with the threaded adjustment member (4) in the first direction, so that the threaded adjustment member (4) can drive the horizontal bracing bracket (2) to move laterally in the placement groove (101) through its own rotational movement; When the horizontal support (2) is moving laterally, the top of the horizontal support (2) abuts against the top wall (103) of the placement slot (101), and the side of the vertical connecting support (3) abuts against the side wall of the limiting slot (102) in the lateral movement direction. The horizontal support (2) drives the connecting shaft (5) to slide in the vertical slot (122) and the oblique slot (211) to realize the lifting and lowering of the hanging box (1) relative to the vertical connecting support (3).

2. The ground height adjustment device for a sliding door according to claim 1, characterized in that, The outer end of the threaded adjusting member (4) is provided with an operating part (410) for controlling the threaded adjusting member (4) to rotate forward or backward; The inner end of the threaded adjustment member (4) is formed with a bracket connection part, and the adjustment member connection part is directly connected to the bracket connection part or connected by a pin.

3. The ground height adjustment device for a sliding door according to claim 2, characterized in that, The threaded hole (124) of the adjusting side end plate (123) of the hanging box (1) is set horizontally in the first direction; The adjusting part of the horizontal bracing (2) has a vertical connecting groove (212), and the bracket connecting part of the threaded adjusting part (4) is connected in the vertical connecting groove (212) by a self-formed flange (430) or a pin.

4. The ground height adjustment device for a sliding door according to claim 3, characterized in that, The horizontal bracing (2) has a U-shaped structure and two parallel second main body side plates (210) so that the vertical connecting bracket (3) is installed between the two second main body side plates (210); The horizontal bracing bracket (2) also has a central base plate (220) located on the side of the horizontal bracing bracket (2) away from the adjustment side end plate (123), and the central base plate (220) is connected to two second main body side plates (210).

5. The ground height adjustment device for a sliding door according to claim 4, characterized in that, The central base plate (220) of the horizontal bracing bracket (2) and the two second main body side plates (210) are integrally formed. The junction of the central base plate (220) and the two second main body side plates (210) is elastic, so that the two second main body side plates (210) can be opened in the second direction on one side of the vertical connecting groove (212) to insert the flange (430) formed by the bracket connecting part of the threaded adjustment member (4).

6. The ground clearance adjustment device for a sliding door according to claim 3 or 4, characterized in that, The flange (430) formed by the bracket connection of the threaded adjustment component (4) has a flange column structure, and the contact surface between the flange (430) and the vertical connecting groove (212) is configured as a plane.

7. The ground height adjustment device for a sliding door according to claim 1, characterized in that, The hanging box (1) includes a separate box body (11) and a core body (12). The cavity of the box body (11) is provided through in a first direction, and the core body (12) is embedded in the box body (11). The placement groove (101), the vertical slot (122) and the adjustment member connection portion are formed in the core (12). The limiting groove (102) is formed on the top of the box body (11); The bottom of the box (11) has connecting portions (113) on both sides in the second direction for connecting the frame (8) or the door.

8. The ground height adjustment device for a sliding door according to claim 1, characterized in that, The horizontal support bracket (2) is restricted within the placement slot (101) of the hanging box (1) to move only in the first direction; or, The hanging box (1) has two or more vertical slots (122), the horizontal support bracket (2) has a corresponding number of oblique slots (211), and the vertical connecting bracket (3) has a corresponding number of shaft holes (301), which are connected by a corresponding number of connecting shafts (5).

9. The ground height adjustment device for a sliding door according to claim 1, characterized in that, The shaft segment connecting the connecting shaft (5) and the vertical connecting bracket (3) is provided with an anti-loosening structure, which includes knurling (501) or an interference fit structure.

10. A sliding door, characterized in that, Includes the ground height adjustment device for a sliding door as described in any one of claims 1-9.

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