Telescoping extension ladder

Abstract

The utility model relates to the technical field of lift equipment, specifically relates to a telescopic extension ladder, including positioning portion and telescopic portion, positioning portion and telescopic portion sliding connection, to this to realize the height change of folding ladder, make it suitable for different operation scene, the positioning portion includes first ladder frame, and the sidewall of first ladder frame is provided with the guide slot, and the telescopic portion includes second ladder frame, and the inboard of second ladder frame is equipped with the guide convex edge of cooperation with guide slot, guide convex edge, and the outside is equipped with the guide pulley of first ladder frame adhesion, and the effect of guide pulley is: reduce the fit gap of the slide of two ladder frames when retracting, the maximum degree reduces the shaking of whole ladder, and the operation is safer, and when the second ladder frame retracts, the original sliding friction with first ladder frame changes the rolling friction with smaller friction coefficient, not only makes the extension ladder more convenient when retracting, but also can lighten the abrasion between two ladder frames when the extension ladder retracts and slides to the maximum, prolongs the service life of telescopic ladder.

Description

Technical Field

[0001] This utility model relates to the field of elevator equipment technology, specifically to a telescopic extension ladder. Background Technology

[0002] In daily life and industrial production, folding ladders are widely used as a convenient and efficient tool for climbing, and are applied in many fields such as home repair, construction, warehousing and logistics.

[0003] Existing telescopic extension ladders typically include at least a positioning section and a telescopic section (i.e., a fixed ladder frame and a movable ladder frame). The height of the entire folding ladder is changed by sliding the telescopic section on the positioning section, ultimately meeting the climbing needs of different workpieces. However, in existing folding ladders, the contact surfaces of the positioning section and the telescopic section are in direct contact during use. For example, Chinese Patent (CN108468507B) discloses a telescopic ladder that includes two identical telescopic vertical bars, a rotating shaft installed inside the telescopic vertical bars to drive their extension and retraction, an electric component that drives the rotating shaft, and a crossbar located between the two telescopic vertical bars. This ladder has the advantages of a large extension range, the ability to carry a person while extending or retracting, reduced labor intensity for the person climbing, and avoidance of the risks associated with climbing up and down on foot.

[0004] However, when the height of the telescopic ladder is adjusted, there will be hard friction between the positioning part and the telescopic part. After long-term use, this will cause excessive wear and deformation of the ladder body profile, which will eventually affect the service life of the ladder or cause the gap between the two to increase, affecting its operational stability. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a telescopic extension ladder that avoids hard friction between the fixed and telescopic parts during use, thereby reducing equipment wear and extending the equipment's service life.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a telescopic extension ladder, comprising a positioning part and a telescopic part, wherein the positioning part and the telescopic part are slidably connected, the positioning part comprising a first ladder frame, wherein a guide groove is provided on the side wall of the first ladder frame, and the telescopic part comprising a second ladder frame, wherein a guide protrusion is provided on one side of the second ladder frame for cooperating with the guide groove, and a guide wheel is provided on the other side for fitting with the first ladder frame.

[0007] As a further improvement to the above technical solution:

[0008] A lifting assembly for driving the telescopic part to rise and fall is provided between the positioning part and the telescopic part, and a locking structure connected to the positioning part is provided on the telescopic part.

[0009] The telescopic parts are multiple in number, and a lifting component and a locking structure are provided between each pair of adjacent telescopic parts.

[0010] The lifting assembly includes a pulley located on the upper part of the positioning part, and a lifting rope is provided on the pulley. One end of the lifting rope is connected to the bottom of the telescopic part, and the other end is a free end.

[0011] The locking structure includes a mounting base, on which a connecting base plate is provided, and a card interface is provided on the side of the connecting base plate facing the positioning part.

[0012] The upper part of the connecting base plate is connected to the mounting base by a torsion spring. The upper part of the connecting base plate is provided with a guide slope located above the card interface, and a sealing strip is provided at the opening of the card interface.

[0013] The beneficial effects of this utility model embodiment are as follows: The telescopic extension ladder includes a positioning part and a telescopic part, which are slidably connected to achieve the height change of the folding ladder, making it suitable for different work scenarios. The positioning part includes a first ladder frame, and a guide groove is provided on the side wall of the first ladder frame. The telescopic part includes a second ladder frame, and a guide protrusion that cooperates with the guide groove is provided on the inner side of the second ladder frame. The guide protrusion has a guide wheel that fits against the first ladder frame on the outer side. The function of the guide wheel is to: 1. reduce the cooperation gap of the slide when the two ladder frames extend and retract, minimize the shaking of the whole ladder, and make the operation safer;

[0014] 2. When the second ladder frame extends or retracts, the sliding friction with the first ladder frame changes to rolling friction with a smaller coefficient of friction. This not only makes the ladder easier to extend and retract, but also minimizes wear between the two ladder frames during the sliding process, thus extending the service life of the telescopic ladder. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a top view of the present invention;

[0017] Figure 3 This is a cross-sectional view of the present invention;

[0018] Figure 4 This is the front view of the present invention.

[0019] In the figure: 1. Positioning part; 2. Telescopic part; 3. First ladder; 4. Guide groove; 5. Second ladder; 6. Guide protrusion; 7. Guide wheel; 8. Pulley; 9. Lifting rope; 10. Mounting base; 11. Connecting base plate; 12. Snap-fit ​​interface; 13. Guide slope; 14. Sealing strip. Detailed Implementation

[0020] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0021] like Figure 1-4 As shown, the telescopic extension ladder of this embodiment includes a positioning part 1 and a telescopic part 2. The positioning part 1 and the telescopic part 2 are used to realize the height change of the folding ladder, making it suitable for different work scenarios. The positioning part 1 includes a first ladder frame 3, and a guide groove 4 is provided on the side wall of the first ladder frame 3. The telescopic part 2 includes a second ladder frame 5, and a guide protrusion 6 that cooperates with the guide groove 4 is provided on the inner side of the second ladder frame 5. The guide protrusion 6 is fitted with a guide wheel 7 that fits against the first ladder frame 3 on the outer side. The function of the guide wheel 7 is to reduce the friction between the contact surface of the second ladder frame 5 and the first ladder frame 3 when the second ladder frame 5 is raised and lowered, so as to avoid excessive wear on the contact surface of the two ladder frames when the height of the folding ladder is adjusted, thereby improving the service life of the equipment. During manufacturing, a reserved gap is reserved between the guide wheel 7 and the guide protrusion 6. The height of the reserved gap is the same as the thickness of the second ladder frame profile. This enhances the stability of the second ladder frame 5 after assembly, ensuring that it will not wobble. The function of the guide wheel 7 is:

[0022] 1. By reducing the clearance between the sliding tracks when the two ladder frames extend and retract, the swaying of the entire ladder is minimized, making operation safer;

[0023] 2. When the second ladder frame extends or retracts, the sliding friction with the first ladder frame changes to rolling friction with a smaller coefficient of friction. This not only makes the ladder easier to extend and retract, but also minimizes wear between the two ladder frames during the sliding process, thus extending the service life of the telescopic ladder.

[0024] During manufacturing, the first ladder frame 3 is composed of U-shaped materials with open slots as ladder beams and riveted to the rungs. The second ladder frame 5 is composed of U-shaped materials with open slots facing outwards as ladder beams and riveted to the rungs. The inner and outer slots of the first and second ladder frames are interlocked with a set of limiting rolling pulleys to form a stable telescopic slide, which facilitates the length adjustment of the entire ladder.

[0025] A lifting assembly for driving the telescopic part 2 to rise and fall is provided between the positioning part 1 and the telescopic part 2. The telescopic part 2 is provided with a locking structure connected to the positioning part 1 to ensure that the entire folding ladder is in a stable state after the second ladder frame 5 has completed the height adjustment, and to prevent the folding ladder from resetting during use.

[0026] There are multiple telescopic parts 2. Each pair of adjacent telescopic parts 2 is provided with a lifting component and a locking structure. The number of telescopic parts 2 is set according to the size of different product models. When there are multiple telescopic parts 2, the height adjustment and locking of two adjacent telescopic parts 2 are accomplished by the lifting component and the locking structure.

[0027] The lifting assembly includes a pulley 8 installed on the upper part of the positioning part 1. A lifting rope 9 is provided on the pulley 8. One end of the lifting rope 9 is connected to the bottom of the telescopic part 2, and the other end is a free end. When adjusting the height, the telescopic part 2 is moved upward by applying a pulling force to the free end of the lifting rope 9.

[0028] The locking structure includes a mounting base 10, on which a connecting base plate 11 is provided. The connecting base plate 11 has a locking interface 12 for locking the first ladder 3 and the second ladder 5 on the side facing the positioning part 1. The adjusted height of the folding ladder is fixed by using the locking interface 12.

[0029] The upper part of the connecting base plate 11 is connected to the mounting base 10 by a torsion spring. The upper part of the connecting base plate 11 is provided with a guide slope 13 located above the card interface 12. A sealing strip 14 is provided at the opening of the card interface 12. One end of the sealing strip 14 is rotatably connected to the lower end of the card interface 12. It is used to seal the card interface 12 when the folding ladder is reset. The function of the torsion spring is to apply an inward pushing force to the connecting member 11 to ensure that the card interface 12 can engage with the first ladder frame 3 and the second ladder frame 5, and to ensure the stability of the folding ladder. During the upward lifting of the telescopic part 2, the guide slope 13 moves upward accordingly. When it rises, it contacts the first ladder frame 3 and applies an outward pushing force to the connecting member 11, so that the connecting base plate 11 separates from the first ladder frame 3 and the second ladder frame 5 and flips outward. As the second ladder frame 5 continues to rise, the connecting base plate 11 is reset under the action of the torsion spring, and the card interface 12 is locked and fixed with the first ladder frame 3 and the second ladder frame 5 again. This action is repeated until the second ladder frame 5 is raised to the working height.

[0030] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0033] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A telescopic extension ladder, comprising a positioning part (1) and a telescopic part (2), wherein the positioning part (1) and the telescopic part (2) are slidably connected, characterized in that: The positioning part (1) includes a first ladder (3), and a guide groove (4) is provided on the side wall of the first ladder (3). The telescopic part (2) includes a second ladder (5), and a guide protrusion (6) that cooperates with the guide groove (4) is provided on one side of the second ladder (5), and a guide wheel (7) that fits with the first ladder (3) is provided on the other side.

2. The telescopic extension ladder according to claim 1, characterized in that: A lifting assembly for driving the telescopic part (2) to rise and fall is provided between the positioning part (1) and the telescopic part (2), and a locking structure connected to the positioning part (1) is provided on the telescopic part (2).

3. The telescopic extension ladder according to claim 2, characterized in that: The number of telescopic parts (2) is multiple, and a lifting component and a locking structure are provided between two adjacent telescopic parts (2).

4. The telescopic extension ladder according to claim 2, characterized in that: The lifting assembly includes a pulley (8) located on the upper part of the positioning part (1), and a lifting rope (9) is provided on the pulley (8). One end of the lifting rope (9) is connected to the bottom of the telescopic part (2), and the other end is a free end.

5. The telescopic extension ladder according to claim 2, characterized in that: The locking structure includes a mounting base (10), on which a connecting base plate (11) is provided, and a card interface (12) is provided on the side of the connecting base plate (11) facing the positioning part (1).

6. The telescopic extension ladder according to claim 5, characterized in that: The upper part of the connecting base plate (11) is connected to the mounting base (10) by a torsion spring. The upper part of the connecting base plate (11) is provided with a guide slope (13) located above the card interface (12). A sealing strip (14) is provided at the opening position of the card interface (12).

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