A loft multi-section sliding extension ladder

Abstract

The utility model discloses a loft multistage sliding telescopic ladder, including ladder and lock catch subassembly. Ladder is by a plurality of can slide each other's ladder composition, and the side wall of adjacent ladder all is provided with lock catch subassembly. The lock catch subassembly includes lock catch casing, pawl, fixed clamping block, tension spring and pin, wherein the pawl and the clamping groove of fixed clamping block interlock, realize automatic locking under the action of tension spring, the controlled motion track is realized to pawl through the cooperation of arc -shaped groove and guide shaft, avoid to be stuck, the pin can selectivity spin into the pinhole on pawl, realize secondary safety positioning, and the steel ball is established between the vertical section material of adjacent ladder, is used for reducing friction, makes telescopic operation more laborsaving smooth. The utility model discloses simple structure can realize automatic positioning and reliable locking, has high security, easy operation, long service life and the advantages such as, especially suitable for the loft and the place of limited space.

Description

Technical Field

[0001] This utility model relates to the field of attic telescopic ladder technology, specifically a multi-section sliding telescopic ladder for attics. Background Technology

[0002] Currently, attics typically use either fixed or telescopic ladders for access. While fixed ladders are simple and sturdy, their large size makes them unsuitable for the space-efficient needs of modern homes and offices. In contrast, telescopic ladders can be folded up when not in use, saving space and thus gaining wider adoption.

[0003] Existing telescopic ladders mostly use pin-type, friction snap-type, or simple slot-type positioning and fixing methods, which have the following main drawbacks: Pin-type ladders require users to manually align the pins and holes, which is cumbersome, especially when used in narrow spaces where positioning is difficult. Friction buckles or simple slot structures are prone to falling off due to wear, shaking, or improper use, causing the ladder to slip during use and posing a safety hazard. Poor stability: The extension sections mostly use sliding fits and lack an effective automatic locking structure, which can easily cause shaking, affecting the user's stability and comfort.

[0004] Patent document CN105443025A discloses a telescopic ladder with automatic locking and unlocking functions. The locking mechanism is based on a pin-hole fit and spring plate elastic return, lacking bilateral engagement between interlocking components. Its resistance to pull-out and its wear resistance stability under vibration or uneven load conditions need to be improved. The movement trajectory of the locking component is not geometrically constrained (e.g., by arc-shaped guidance), which can easily lead to jamming or uneven wear under complex working conditions. Patent document CN118327435A also has the above problems. Patent document EP3707340A1 has a locking component at the steps / posts with a button / wedge / rod structure. The lack of arc-shaped groove guidance also presents the above problems.

[0005] Patent document CN109386232A achieves positioning by locking the fixed locking element onto the lower step and controls the rotation angle using a limiting element, providing a certain degree of automatic reset and overtravel prevention; however, its locking object is the step rather than the ladder sidewall, and its structure is limited to the step locking mode; Patent document CN206000449U's core is a press-link mechanism, not a ratchet-slot interlocking locking method, and it does not involve pin safety positioning, arc groove guidance, or steel ball friction reduction design, still having problems of insufficient stability and high frictional resistance.

[0006] In summary, existing attic retractable ladders have shortcomings in terms of ease of operation, safety, stability, and service life, and a structural improvement solution is urgently needed to address these issues.

[0007] To address the aforementioned deficiencies, this application proposes a multi-segment sliding telescopic ladder that achieves self-locking through automatic engagement between a pawl and a slot, and utilizes a pin for secondary safety positioning, thereby resolving the aforementioned problems. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the existing defects and provide a multi-section sliding telescopic ladder for attics. The multi-section sliding telescopic ladder can not only quickly achieve positioning and locking and is easy to operate, but also significantly improves safety, reliability and durability. It is especially suitable for attic scenarios with high requirements for space utilization and safety, and can effectively solve the problems in the background technology.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a multi-section sliding telescopic ladder for lofts, including a locking assembly (1) and a ladder. The ladder includes a first ladder (2) and a second ladder (3). The first ladder (2) and the second ladder (3) are slidably engaged. Locking assemblies (1) are respectively provided on the side of the first ladder (2) and the side of the second ladder (3). The locking assemblies (1) on the first ladder (2) and the second ladder (3) cooperate with each other. Through the mutual locking cooperation of the locking assemblies (1), the first ladder (2) and the second ladder (3) are locked. The locking assembly (1) includes a locking housing (10), a pawl (14), a fixing block (16), and a tension spring (15). The locking housing (10) is fixed to the side of the ladder by screws. The pawl (14) is rotatably connected to the fixing shaft (13) on the locking housing (10). The fixing block (16) is fixed to the side of the ladder by screws. The pawl (14) is located on one side of the pawl (14). The fixed block (16) is provided with a slot (7). The slot (7) is used in conjunction with the pawl (14) of the locking assembly (1) on another ladder. The pawl (14) is inserted into the slot (7) to achieve the locking function. One end of the tension spring (15) is connected to the fixed block (16), and the other end of the tension spring (15) is connected to the pawl (14). The tension spring (15) provides a restoring force for the pawl (14). During the movement of the ladder, the pawl (14) can automatically be inserted into the slot (7). The locking housing (10) is provided with a pin (11), and the pawl (14) is provided with a pin hole (17) that cooperates with the pin (11). By screwing the pin (11) into the pin hole (17), the positioning and locking of the two locking assemblies (1) can be achieved. Screwing out the pin (11) can put the pawl (14) in a free state.

[0010] Instructions for use: In the original state, the locking components (1) on ladder one (2) correspond to those on ladder two (3). When ladder two (3) is pulled up, the locking components (1) on ladder one (2) rotate under the action of external force, disengage from the slot (7), and then screw into the pin hole (17). At this time, the pin (11) of ladder one (2) is inserted into the pin hole (17), and the pawl (14) is not exposed. Pull the ladder back so that ladder one (2) and ladder two (3) are in the positioning position. Then screw out the pin (11), and the pawl (14) is in the free state. Then pull one of the ladders, and the pawl (14) is locked into the slot (7) to complete the positioning. The specific setting position of the locking components (1) is selected according to the situation. The positioning of the sliding telescopic ladder is mainly achieved by the cooperation of two locking components (1).

[0011] Furthermore, an upper bolt (19) is provided on the fixing block (16), a lower bolt (18) is provided on the pawl (14), and a tension spring (15) is provided between the upper bolt (19) and the lower bolt (18).

[0012] Furthermore, a nut (12) is provided on the locking housing (10), and a thread is provided on the pin (11). The pin (11) is threadedly connected to the nut (12). The pin (11) can also be designed as a spring pin. Pulling the pin (11) will cause the pin (11) to disengage from the pin hole (17). Loosening the pin (11) allows the pin (11) to be freely inserted into the pin hole (17). The specific choice depends on the actual usage.

[0013] Furthermore, the locking housing (10) is provided with an arc groove (8), and the pawl (14) is provided with a guide shaft (9). The other end of the guide shaft (9) extends into the arc groove (8). The movement trajectory of the pawl (14) is restricted by the cooperation between the arc groove (8) and the guide shaft (9), thereby ensuring the folding and unfolding of the pawl (14).

[0014] Furthermore, at least two ladders are provided, and the ladders slide against each other.

[0015] Furthermore, the ladder includes horizontal profiles (5) and vertical profiles (4). The horizontal profiles (5) are arranged between the vertical profiles (4). Steel balls (6) are arranged between the vertical profiles (4) of adjacent ladders. The steel balls (6) reduce the friction between the sliding parts and save physical strength.

[0016] Furthermore, the locking housing (10) is made of metal or high-strength engineering plastic to improve overall wear resistance and service life.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. This application achieves automatic bidirectional locking by setting a pair of locking components on the side walls of adjacent ladders and using the mutual engagement of pawls and fixed locking blocks. Under the action of the tension spring, the pawls can automatically enter the locking blocks, ensuring that the ladder automatically completes positioning during extension and avoiding unlocking due to human negligence. At the same time, a pin hole is set on the pawl and a screw-in or spring-loaded pin is set on the locking housing to form a secondary safety positioning structure, which enables the ladder to maintain a stable locked state under vibration, impact or off-center load, significantly improving the overall safety and stability of the ladder.

[0018] 2. This application designs an arc-shaped groove on the locking housing and sets a guide shaft on the pawl, so that the folding and unfolding trajectory of the pawl is geometrically constrained, and can complete engagement and release along a predetermined path. This design effectively avoids jamming, skipping teeth or abnormal wear caused by pawl deviation, ensuring smooth and reliable locking and unlocking actions. In addition, steel balls are arranged between adjacent ladder vertical profiles, using rolling friction to replace traditional sliding friction, which greatly reduces the frictional resistance between ladders, making the extension and retraction process easier, and allowing users to unfold and retract the ladder with less operating force.

[0019] 3. Through the coordinated design of the interlocking pawl-slot + pin secondary positioning + arc groove guidance + steel ball friction reduction, this application has achieved significant improvements in safety, ease of operation, stability and durability. Especially in the attic scenario, the telescopic ladder of this application can be quickly extended and retracted, and is easy to operate. It has higher stability and safety redundancy during use, meeting the dual needs of modern living and working environments for space saving and safety. Attached Figure Description

[0020] Figure 1 This is a side view of the structure of this utility model; Figure 2 This is an isometric drawing of the present invention; Figure 3 This is a top view of the structure of this utility model; Figure 4 This is a schematic diagram of the locking assembly structure of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the locking assembly structure of this utility model. Figure 2 ; Figure 6 This is a schematic diagram of the initial state structure of the locking assembly of this utility model; Figure 7 This is a schematic diagram of the non-exposed pawl structure of this utility model; Figure 8 This is a schematic diagram of the ratchet spring-loaded slot structure of this utility model; Figure 9This is a schematic diagram of the three-section ladder structure of this utility model.

[0021] In the diagram: 1 Locking assembly (1), 2 Ladder 1 (2), 3 Ladder 2 (3), 4 Vertical profile (4), 5 Horizontal profile (5), 6 Steel ball (6), 7 Slot (7), 8 Arc groove (8), 9 Guide shaft (9), 10 Locking housing (10), 11 Pin (11), 12 Nut (12), 13 Fixed shaft (13), 14 Pawl (14), 15 Tension spring (15), 16 Fixed block (16), 17 Pin hole (17), 18 Lower bolt (18), 19 Upper bolt (19). Detailed Implementation

[0022] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Please see Figure 1-9 This utility model provides a technical solution: a multi-section sliding telescopic ladder for attics, including a locking assembly 1 and a ladder. The ladder includes a first ladder 2 and a second ladder 3, which are slidably engaged. Locking assemblies 1 are respectively provided on the side of the first ladder 2 and the side of the second ladder 3. The locking assemblies 1 on the first ladder 2 and the second ladder 3 cooperate with each other, locking the first ladder 2 and the second ladder 3 through the mutual locking engagement of the locking assemblies 1. The locking assembly 1 includes a locking housing 10, a pawl 14, a fixing block 16, and a tension spring 15. The locking housing 10 is fixed to the side of the ladder by screws, and the pawl 14 is rotatably connected to a fixing shaft 13 on the locking housing 10. A fixing block 16 is located on one side of the pawl 14. The fixing block 16 has a slot 7, which works in conjunction with the pawl 14 of the locking assembly 1 on another ladder. The pawl 14 engages in the slot 7 to achieve the locking function. One end of the tension spring 15 is connected to the fixing block 16, and the other end is connected to the pawl 14, providing a restoring force for the pawl 14. During the movement of the ladder, the pawl 14 can automatically engage in the slot 7. A pin 11 is provided on the locking housing 10, and a pin hole 17 is provided on the pawl 14 to engage with the pin 11. By screwing the pin 11 into the pin hole 17, the two locking assemblies 1 are positioned and locked. Screwing out the pin 11 puts the pawl 14 in a free state.

[0024] In the above embodiment, the fixing block 16 is provided with an upper bolt 19, the pawl 14 is provided with a lower bolt 18, and the tension spring 15 is provided between the upper bolt 19 and the lower bolt 18, so that the positioning of the tension spring 15 is more stable and reliable, and it is prevented from shifting or loosening during long-term use.

[0025] In another embodiment, a nut 12 is provided on the locking housing 10, and a thread is provided on the pin 11, with the pin 11 threadedly connected to the nut 12; the pin 11 can also be designed as a spring pin, which can be pulled to disengage from the pin hole 17 and automatically insert into the pin hole 17 after being released, which can further simplify the operation.

[0026] In a further embodiment, the locking housing 10 is provided with an arc-shaped groove 8, and the pawl 14 is provided with a guide shaft 9. The other end of the guide shaft 9 extends into the arc-shaped groove 8. The movement trajectory of the pawl 14 is restricted by the cooperation between the arc-shaped groove 8 and the guide shaft 9, so that the folding and unfolding process is carried out along a predetermined path, thereby avoiding jamming and abnormal wear.

[0027] In another embodiment, at least two ladders are provided, and the ladders slide against each other to achieve multi-segment extension; the ladder includes vertical profiles 4 and horizontal profiles 5, with the horizontal profiles 5 disposed between the vertical profiles 4, and steel balls 6 are provided between the vertical profiles 4 of adjacent ladders. The sliding friction between the ladders is converted into rolling friction by the steel balls 6, thereby effectively reducing resistance and saving the user's physical strength when operating.

[0028] In another embodiment, the locking housing 10 is made of metal or high-strength engineering plastic to improve the overall wear resistance and service life; the metal housing is suitable for high-intensity use, while the engineering plastic has the advantages of being lightweight, corrosion-resistant, and flexible in molding, and can be selected according to different usage environments and cost requirements.

[0029] This application achieves automatic locking by setting a pair of locking components 1 on the side walls of adjacent ladders, and using the interlocking of pawl 14 and slot 7 on the fixed block 16. During the extension and retraction process, the pawl 14 automatically engages in the slot 7 under the action of the tension spring 15, completing self-locking and avoiding the situation of not locking due to operational negligence. At the same time, a pin hole 17 is set on the pawl 14, and a screw-in or insertable pin 11 is set on the locking housing 10 to achieve secondary safety positioning, ensuring reliable locking even under vibration, impact or off-center load. By introducing an arc groove 8 and a guide shaft 9 in the locking housing 10, the movement trajectory of the pawl 14 is restricted, thereby avoiding jamming or abnormal wear caused by free rotation. Steel balls 6 are set between the ladders, so that the extension and retraction process changes from sliding friction to rolling friction, which significantly reduces resistance and wear, and improves the ease of operation and durability.

[0030] Compared with existing technologies, the telescopic ladder structure of this application significantly improves the safety, stability and ease of operation through a combination of ratchet-slot automatic engagement, pin secondary positioning, arc groove guidance and steel ball friction reduction design. The telescopic ladder can save space when stored and quickly complete positioning when unfolded, making it suitable for residential attics, offices and other scenarios with limited space. The overall structure has a long service life and is easy to maintain, making it highly practical and of great significance for promotion.

[0031] In the above scheme, the locking housing 10 can be made of different materials, such as aluminum alloy, stainless steel, carbon steel or reinforced engineering plastic; the connection between the pawl 14 and the fixed shaft 13 can be a pin, slider or roller hinge; the tension spring 15 can be replaced with a torsion spring or compression spring; in addition to the threaded insertion method, the pin 11 can also be a pull ring pin, ball lock pin or other forms to meet different operating requirements; the trajectory of the arc groove 8 can be designed as a circular arc, elliptical arc or straight line guide, and the guide shaft 9 can be replaced with a roller or slider to reduce friction; the number of ladder sections can be set to 2 sections, 3 sections or more according to the usage requirements, and the cross-sectional shape of the vertical profile 4 and the horizontal profile 5 can be rectangular, groove or I-shaped; the steel ball 6 can also be replaced with roller, needle bearing or other structures to further improve the friction reduction performance.

[0032] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A multi-section sliding telescopic ladder for attics, comprising a locking assembly (1) and a ladder, characterized in that: The ladder includes a first ladder (2) and a second ladder (3). The first ladder (2) and the second ladder (3) are slidably connected. The sides of the first ladder (2) and the second ladder (3) are respectively provided with locking components (1). The locking components (1) on the first ladder (2) and the locking components (1) on the second ladder (3) cooperate with each other. The locking components (1) include a locking housing (10), a pawl (14), a fixing block (16), and a tension spring (15). The locking housing (10) is fixed to the side of the ladder by screws. The pawl (14) and the locking housing The fixed shaft (13) on (10) is rotatably connected, the fixed block (16) is set on one side of the pawl (14), the fixed block (16) is provided with a slot (7), the slot (7) is used in conjunction with the pawl (14) of the locking assembly (1) on another ladder, one end of the tension spring (15) is connected to the fixed block (16), the other end of the tension spring (15) is connected to the pawl (14), the locking housing (10) is provided with a pin (11), and the pawl (14) is provided with a pin hole (17) that cooperates with the pin (11).

2. The multi-section sliding telescopic ladder for attics according to claim 1, characterized in that: The fixing block (16) is provided with an upper bolt (19), the pawl (14) is provided with a lower bolt (18), and the tension spring (15) is provided between the upper bolt (19) and the lower bolt (18).

3. The multi-section sliding telescopic ladder for attics according to claim 1, characterized in that: The locking housing (10) is provided with a nut (12) and the pin (11) is provided with a thread, and the pin (11) is threadedly connected to the nut (12).

4. A multi-section sliding telescopic ladder for attics according to claim 1, characterized in that: The locking housing (10) is provided with an arc groove (8), and the pawl (14) is provided with a guide shaft (9), the other end of which extends into the arc groove (8).

5. A multi-section sliding telescopic ladder for attics according to claim 1, characterized in that: At least two ladders must be installed, and the ladders must slide against each other.

6. A multi-section sliding telescopic ladder for attics according to claim 5, characterized in that: The ladder includes horizontal profiles (5) and vertical profiles (4), with the horizontal profiles (5) positioned between the vertical profiles (4).

7. A multi-section sliding telescopic ladder for attics according to claim 1, characterized in that: The locking housing (10) is made of metal or high-strength engineering plastic.

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