Ladder body, ladder joints and ladder

Abstract

The present invention relates to a ladder body, a ladder joint and a ladder. A ladder joint comprises two ladder bodies and a ladder joint for connecting adjacent ladder bodies; the ladder body comprises a longitudinal support body; the longitudinal support body has a slot; the slot is located at the end of the longitudinal support body for docking with the ladder joint; the ladder joint comprises two insertion parts for inserting into the slot; the insertion part has a free end and a fixed end opposite to the free end; the insertion part has a first side opposite to the bending direction of the ladder joint; the first side of the insertion part comprises a first section and a second section, the first section being recessed; the first section extends from the fixed end of the first side of the insertion part toward the free end; the first section and the second section are arranged in sequence from the fixed end of the insertion part to the direction of the free end. The above ladder joint avoids stress concentration in the ladder joint and / or the ladder body at this position, thereby avoiding damage or destruction of the ladder joint and / or the ladder body.

Description

Technical Field

[0001] The present invention relates to the field of ladders, and in particular to a ladder main body, a ladder joint and a ladder. Background Art

[0002] A stepladder is a commonly used ladder for climbing. Generally, a ladder consists of two ladder bodies and a ladder joint connecting the two ladder bodies. By bending the ladder joint, the angle between the two ladder bodies can be adjusted to suit different usage environments. In one type of ladder, the bending of the ladder joint can adjust the angle between the two ladder bodies between 0° and 180°. When the angle between the two ladder bodies is 180°, the ladder is in a straight line.

[0003] Traditionally, when a ladder is in a straight position and carries a heavy load, it is prone to bending, causing stress concentration at the connection points between the ladder joints and the ladder body. This can easily cause damage or destruction to the ladder joints and / or the ladder body, shortening the service life of the ladder. Summary of the Invention

[0004] Problems to be solved by the invention

[0005] Aiming at the phenomenon that the ladder joints and / or the ladder body are easily damaged or broken when the ladder is in a straight line and carries a heavy load, a ladder joint is provided to avoid the phenomenon that the ladder joints and / or the ladder body are easily damaged or broken when the ladder is in a straight line and carries a heavy load, thereby improving the service life.

[0006] Solutions for solving problems

[0007] A ladder joint, comprising two ladder bodies and a ladder joint for connecting adjacent ladder bodies; the ladder bodies comprising longitudinal supports; the longitudinal supports having slots; the slots being located at ends of the longitudinal supports for docking with the ladder joints;

[0008] The ladder joint includes two insertion parts for inserting into the slots; the insertion parts have a free end and a fixed end opposite to the free end; the insertion part has a first side surface opposite to the bending direction of the ladder joint; the first side surface of the insertion part includes a first section and a second section, and the first section is recessed; the first section extends from the fixed end of the first side surface of the insertion part toward the free end; and the first section and the second section are arranged in sequence from the fixed end of the insertion part to the free end.

[0009] Optionally, the recessed depth of the first section is 0.1 mm to 2.0 mm.

[0010] Optionally, along the arrangement direction of the first segment and the second segment, a ratio of a length of the first segment of the first side surface to a length of the first side surface is 1:5 to 1:1.2.

[0011] Optionally, the depression degree of different positions of the first section is the same;

[0012] Alternatively, the depression degree of the first section gradually increases along the direction from the free end to the fixed end of the insertion portion.

[0013] Optionally, a first buffer layer is provided on the first section.

[0014] The present application also provides a ladder body, comprising two ladder bodies and a ladder joint for connecting adjacent ladder bodies; the ladder body comprises a longitudinal support body; the longitudinal support body has a slot; the ladder joint comprises two insertion mechanisms for inserting into the slot; the insertion mechanism has a first side surface opposite to the bending direction of the ladder joint; the ladder joint comprises two insertion portions matching the slots;

[0015] The slot has a docking section for docking with the ladder joint, and the docking section has a first inner side surface arranged opposite to the first side surface; the first inner side surface includes a third section, and the third section is recessed; the third section extends inward from the end of the first inner side surface.

[0016] Optionally, the depth of the third section of the depression is 0.1 mm to 2.0 mm.

[0017] Optionally, a second buffer layer is provided on the third section.

[0018] The present application also provides a ladder, which comprises:

[0019] Two ladder bodies, each comprising a longitudinal support body having a slot; the slot being located at an end of the longitudinal support body for docking with the ladder joint;

[0020] A ladder joint for connecting two ladder bodies; the ladder joint includes two insertion portions for inserting into the slots; the insertion portion has a free end and a fixed end opposite to the free end; the insertion portion has a first side surface opposite to the bending direction of the ladder joint; the first side surface of the insertion portion includes a first section and a second section; the first section extends from the fixed end of the first side surface of the insertion portion toward the free end; the first section and the second section are arranged in sequence from the fixed end of the insertion portion to the free end;

[0021] There is a gap between the first section of the first side surface and the inner side wall of the slot.

[0022] Optionally, the size of the gap is 0.1 mm to 2.0 mm.

[0023] Optionally, the first section is recessed;

[0024] And / or, the inner side wall of the slot includes a first inner side surface arranged opposite to the first side surface; the first inner side surface includes a third section arranged corresponding to the first section; and the third section is recessed.

[0025] Optionally, the ladder further includes a buffer layer arranged in the gap.

[0026] Effects of the Invention

[0027] The first section of the first side surface of the insertion portion of the aforementioned ladder joint is recessed. This ensures that, after the ladder joint is assembled and connected to the ladder body, the first section does not directly contact the longitudinal supports on the ladder body, leaving a gap. Therefore, when the ladder is in a straight position and carrying a heavy load, even if the ladder bends, the first section will not be pressed by the longitudinal supports. This prevents stress concentration in the ladder joint and / or the ladder body at this location, thereby preventing damage to the ladder joint and / or the ladder body and extending its service life.

[0028] The third section of the ladder body is recessed within the slots in the longitudinal support members. This ensures that, after the ladder joint and the ladder body are assembled, the third section does not directly contact the insertion portion of the ladder joint, leaving a gap. Therefore, when the ladder is in a straight position and carrying a heavy load, even if the ladder bends, the third section will not be pressed by the insertion portion. This prevents stress concentration in the ladder joint and / or the ladder body at this location, thereby preventing damage to the ladder joint and / or the ladder body and extending its service life.

[0029] In the aforementioned ladder, a gap is provided between the first section of the first side surface and the inner sidewall of the slot. Thus, when the ladder is in a straight-line position and carrying a heavy load, even if the ladder bends, the first section will not be pressed by the inner sidewall of the slot. This prevents stress concentration at the ladder joint and / or the ladder body at this location, thereby preventing damage to the ladder joint and / or the ladder body and increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of a ladder provided in one embodiment of the present application when in a straight line position (in use).

[0031] Figure 2 for Figure 1 Schematic diagram of the connection position between the middle ladder body and the ladder joint.

[0032] Figure 3for Figure 2 A partial enlarged view of middle A.

[0033] Figure 4 for Figure 1 The ladder shown is a schematic diagram of its structure that bends due to carrying heavy objects.

[0034] Figure 5 for Figure 4 Schematic diagram of the connection position between the middle ladder body and the ladder joint.

[0035] Figure 6 for Figure 5 A partial enlarged view of B.

[0036] Figure 7 A schematic diagram of the connection position between the ladder body and the ladder joints in a ladder provided in another embodiment of the present application.

[0037] Figure 8 A schematic diagram of the connection position between the ladder body and the ladder joints in a ladder provided in another embodiment of the present application.

[0038] Figure 9 for Figure 8 A partial enlarged view of C in the middle.

[0039] Figure 10 A schematic diagram of the connection position between the ladder body and the ladder joints in a ladder provided in another embodiment of the present application.

[0040] Figure 11 for Figure 10 A partial enlarged view of D in the middle.

[0041] Description of Reference Numerals

[0042] 100 / 200 / 300 / 400, ladders;

[0043] 110. Ladder body; 111. Longitudinal support; 112. Slot; 113. First inner side; 114. Third section; 115. Fourth section;

[0044] 120, ladder joint; 121, insertion portion; 122, free end; 123, fixed end; 124, first side; 125, first section; 126, second section;

[0045] 130. Gap. DETAILED DESCRIPTION

[0046] To make the technical solutions and beneficial effects of the present invention more clearly understood, the following detailed description is given by way of specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly illustrate the details of the local features. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0047] In the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of simplifying the description of the present invention, and do not indicate that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and should not be understood as a limitation to the present invention.

[0048] In this disclosure, the terms "first" and "second" are used solely for descriptive purposes and should not be construed as indicating the relative importance of the features indicated or the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, and "several" means at least one, such as one, two, or three, unless otherwise specifically defined.

[0049] In the present invention, unless otherwise expressly defined, the terms "installed," "connected," "connect," "fixed," and "disposed" should be understood broadly. For example, "connection" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0050] In the present invention, unless otherwise clearly defined, when a first feature is “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature, the first feature and the second feature may be in direct contact, or the first feature and the second feature may be in indirect contact via an intermediate medium. Moreover, when a first feature is “on,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0051] See also Figures 1 to 6 A ladder 100 provided in one embodiment of the present application includes two ladder bodies 110 and a ladder joint 120 for connecting adjacent ladder bodies 110 .

[0052] The ladder body 110 includes a longitudinal support body 111. The longitudinal support body 111 has a slot 112. The slot 112 is located at the end of the longitudinal support body 111 for docking with the ladder joint 120. It can be understood that the depth direction of the slot 112 is the direction in which the longitudinal support body 111 extends, that is, the longitudinal direction. Figure 2 aa direction in .

[0053] For details, see Figure 2 and Figure 3 The ladder joint 120 includes two insertion portions 121 for inserting into the slots 112. The insertion portion 121 has a free end 122 and a fixed end 123 opposite to the free end 122. The insertion portion 121 has a first side surface 124 opposite to the bending direction of the ladder joint 120. It is understood that the bending direction of the ladder joint 120 is Figure 2 b direction. Specifically, the first side surface 124 of the insertion portion 121 includes a first section 125 and a second section 126. The first section 125 is recessed. The first section 125 extends from the fixed end 123 of the first side surface 124 of the insertion portion 121 toward the free end 122. The first section 125 and the second section 126 are arranged in sequence, from the fixed end 123 of the insertion portion 121 toward the free end 122.

[0054] The first section 125 of the first side surface 124 of the insertion portion 121 of the ladder joint 120 is recessed. This ensures that, after the ladder joint 120 is assembled and connected to the ladder body 110, the first section 125 does not directly contact the longitudinal supports 111 of the ladder body 110, leaving a gap 130. Therefore, even if the ladder 100 bends, the first section 125 is not pressed by the longitudinal supports 111, thereby preventing stress concentration at this location on the ladder joint 120 and / or the ladder body 110. This in turn prevents damage to the ladder joint 120 and / or the ladder body 110, thereby increasing their service life.

[0055] Furthermore, the ladder joint 120 is recessed only in the first section 125 of the first side surface 124. When the ladder 100 is in the straight position, the second section 126 can abut against the sidewall of the slot 112, thereby ensuring the stability of the connection between the ladder joint 120 and the ladder body 110 and further ensuring the safety of the ladder 100.

[0056] Furthermore, when the ladder 100 is in a straight line and carries a large load, if the ladder 100 is bent to a certain extent, the first section 125 can still abut against the side wall of the slot 112, see Figures 4 to 6 Thus, on the one hand, the stability of the connection between the ladder joint 120 and the ladder body 110 is better ensured, thereby better ensuring the safety of the ladder; on the other hand, after the first section 125 abuts against the side wall of the slot 112, the ladder joint 120 and the ladder body 110 can further jointly share the bending stress generated by the bending of the ladder 100, thereby avoiding the phenomenon that one of the ladder joint 120 and the ladder body 110 is easily damaged due to the large force, thereby improving the service life of the ladder joint 120 and the ladder body 110; on the other hand, while achieving the above-mentioned beneficial effects, it does not increase the cost too much, nor does it increase the structural complexity of the ladder 100 too much.

[0057] Specific to Figures 1 to 6 In the illustrated embodiment, each ladder body 110 includes two longitudinal supports 111, and the two ladder bodies 110 are connected by two ladder joints 120. It will be appreciated that, in other embodiments, each ladder body may have only one longitudinal support or more than two longitudinal supports; similarly, the two ladder bodies may be connected by one ladder joint or more than two ladder joints.

[0058] against Figures 1 to 6In the illustrated ladder 100, each ladder body 110 includes two longitudinal supports 111. The two ladder bodies 110 are connected by two ladder joints 120. Safety testing requirements in some countries require testing with only one ladder joint 120 in operation, and the load required during testing is 3.2 to 4 times the load requirement of the ladder 100. The recessed first section 125 in the ladder joint 120 improves the connection stability of the ladder 100 without significantly increasing costs, allowing it to better meet or even exceed safety testing standards.

[0059] Furthermore, currently, a common method for improving the load-bearing performance of the ladder 100 is to increase the cross-sectional area of ​​the longitudinal supports 111 or to change the material of the longitudinal supports 111 to increase the load-bearing capacity of the ladder 100. However, the above-described structure can increase the load-bearing capacity of the ladder 100 without increasing the cross-sectional area of ​​the longitudinal supports 111 or changing their material. Thus, the load-bearing capacity of the ladder 100 can be increased without significantly increasing costs.

[0060] It is understood that the ladder body 110 further includes a pedal mechanism (not shown) which is fixedly mounted laterally on the longitudinal support body 111 for the user to step on when climbing up the ladder 100. The specific structure of the pedal mechanism can adopt conventional arrangements in the art.

[0061] Optionally, in a feasible embodiment, the recessed depth of the first section 125 is 0.1 mm to 2.0 mm, so that the ladder joint 120 can achieve the above-mentioned beneficial effects while also avoiding excessive impact on the strength of the ladder joint 120. Specifically, the recessed depth of the first section 125 can be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc.

[0062] Optionally, along the arrangement direction of the first section 125 and the second section 126, i.e., the aa direction, a ratio of a length d1 of the first section 125 of the first side surface 124 to a length d2 of the first side surface 124 is 1:5 to 1:1.2, so that the ladder joint 120 can achieve the above-mentioned beneficial effects while also ensuring the stability of the abutment between the ladder joint 120 and the ladder body 110.

[0063] Specific to Figure 2 and Figure 3In the illustrated embodiment, the first side surface 124 includes only a first section 125 and a second section 126. It will be appreciated that, in other embodiments, the first side surface is not limited to including only the first and second sections. For example, in one feasible embodiment, the first side surface may further include a transition section disposed between the first and second sections; the recessed depth of the transition section gradually decreases from the first section toward the second section; in the transition section, the recessed depth at the end connecting to the first section is equal to that of the first section, and the recessed depth at the end connecting to the second section is zero.

[0064] Alternatively, see Figure 3 , the depression degrees of different positions of the first section 125 are the same.

[0065] Alternatively, see Figure 7 In the ladder 200 shown, the depression degree of the first section 125 gradually increases along the direction from the free end 122 to the fixed end 123 of the insertion portion 121 .

[0066] Optionally, in another feasible embodiment, a first buffer layer is provided on the first section. Thus, even when the ladder is bent and the first section of the first side surface of the ladder joint indirectly abuts the longitudinal support of the ladder body, the first buffer layer can relieve the stress between the ladder joint and the ladder body at that location, thereby reducing the abutting force exerted on the first section of the first side surface of the ladder joint and the longitudinal support at that location, thereby reducing the risk of damage to the ladder joint and the longitudinal support at that location and increasing the service life of the ladder joint, the ladder body, and the ladder.

[0067] See 8 and Figure 9 Another embodiment of the present application provides a ladder 300 that differs from ladder 100 in that the slot 112 includes a docking section for docking with the ladder joint 120. The docking section includes a first inner side surface 113 disposed opposite the first side surface 124. The first inner side surface 113 includes a third section 114. The third section 114 is recessed and extends inward from the end of the first inner side surface 113. In other words, the recessed third section 114 forms a gap 130 in ladder 300.

[0068] Of course, the first inner side surface 113 also includes a fourth section 115 disposed opposite the first side surface 124. The fourth section 115 is substantially aligned with the first side surface 124. In other words, there is a slight gap between the fourth section 115 and the first side surface 124, making it easier for the insertion portion 121 to be inserted into the slot 112.

[0069] Optionally, the depth of the depression of the third section 114 is 0.1 mm to 2.0 mm. Specifically, the depth of the depression of the third section 114 can be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc.

[0070] Optionally, in another feasible embodiment, a second buffer layer is provided on the third section. It is understandable that the function of the second buffer layer is the same as that of the first buffer layer, and only the location is different.

[0071] It can be understood that the positions of the first buffer layer and the second buffer layer are selected to facilitate positioning and assembling the first buffer layer and the second buffer layer through the recessed positions.

[0072] See also Figure 10 and Figure 11 The ladder 400 provided in another embodiment of the present application differs from the ladders 100 and 300 in that the third section 114 and the first section 125 are both recessed. That is, the ladder 400 forms a gap 130 by recessing the first section 125 and the third section 114.

[0073] The gap 130 formed in this manner can reduce the depth of the recesses of the first section 125 and the third section 114, thereby achieving the same beneficial effect as described above. This can further prevent the structural strength of the ladder joint 120 from being excessively affected by the recessed setting of the first section 125, and can also prevent the structural strength of the ladder body 110 from being excessively affected by the recessed setting of the third section 114.

[0074] Optionally, the size of the gap 130 is 0.1 mm to 2.0 mm. Specifically, the size of the gap 130 can be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc.

[0075] Optionally, the ladder further includes a buffer layer disposed in the gap. It is understood that the buffer layer here can be the aforementioned first buffer layer, the aforementioned second buffer layer, or a combination of the first and second buffer layers.

[0076] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the claims. Various modifications and variations may be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form additional embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of the present invention and do not limit the scope of protection of the patent of this invention.

Claims

1. A ladder joint, comprising two ladder bodies and a ladder joint for connecting adjacent ladder bodies; the ladder bodies comprising longitudinal supports; the longitudinal supports having slots; the slots being located at ends of the longitudinal supports for docking with the ladder joints; It is characterized by: The ladder joint includes two insertion parts for inserting into the slots; the insertion parts have a free end and a fixed end opposite to the free end; the insertion part has a first side surface opposite to the bending direction of the ladder joint; the first side surface of the insertion part includes a first section and a second section, and the first section is recessed; the first section extends from the fixed end of the first side surface of the insertion part toward the free end; and the first section and the second section are arranged in sequence from the fixed end of the insertion part to the free end.

2. The ladder joint according to claim 1, characterized in that: The depression depth of the first section is 0.1 mm to 2.0 mm.

3. The ladder joint according to claim 1, characterized in that: Along the arrangement direction of the first segment and the second segment, a ratio of a length of the first segment of the first side surface to a length of the first side surface is 1:5 to 1:1.

2.

4. The ladder joint according to any one of claims 1 to 3, characterized in that: A first buffer layer is provided on the first section.

5. A ladder body, comprising two ladder bodies and a ladder joint for connecting adjacent ladder bodies; the ladder body comprising a longitudinal support body; the longitudinal support body having a slot; the ladder joint comprising two insertion mechanisms for inserting into the slot; the insertion mechanism having a first side surface opposite to the bending direction of the ladder joint; the ladder joint comprising two insertion portions matching the slots; It is characterized by: The slot has a docking section for docking with the ladder joint, and the docking section has a first inner side surface arranged opposite to the first side surface; the first inner side surface includes a third section, and the third section is recessed; the third section is extended inward from the end of the first inner side surface.

6. The ladder main body according to claim 5, characterized in that: The depth of the third section of the depression is 0.1 to 2.0 mm.

7. The ladder main body according to claim 5 or 6, characterized in that: A second buffer layer is provided on the third section.

8. A ladder, characterized in that: include: Two ladder bodies, each of which comprises a longitudinal support body; each of which has a slot; A ladder joint for connecting two ladder bodies; the slot is located at the end of the longitudinal support body for docking with the ladder joint; the ladder joint includes two insertion portions for inserting into the slot; the insertion portion has a free end and a fixed end opposite to the free end; the insertion portion has a first side surface opposite to the bending direction of the ladder joint; the first side surface of the insertion portion includes a first section and a second section; The first section extends from the fixed end of the first side surface of the insertion portion toward the free end; the first section and the second section are arranged in sequence from the fixed end of the insertion portion toward the free end; There is a gap between the first section of the first side surface and the inner side wall of the slot.

9. The ladder according to claim 8, characterized in that The size of the gap is 0.1mm to 2.0mm; The first section is recessed; And / or, the inner side wall of the slot includes a first inner side surface arranged opposite to the first side surface; the first inner side surface includes a third section arranged corresponding to the first section; and the third section is recessed.

10. The ladder according to claim 8 or 9, characterized in that: The ladder further includes a buffer layer arranged in the gap.

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