Hinge device for ladder

Abstract

The utility model discloses a hinge device for a ladder. The hinge device comprises a first connecting piece, a second connecting piece, a connecting shaft and a locking piece, the first connecting piece and the second connecting piece are hinged through a connecting shaft; the locking piece comprises a grab handle, a penetrating column and two positioning columns are arranged on the grab handle, the penetrating column extends into the connecting shaft, and the two positioning columns are symmetrically arranged along the penetrating column; two first through holes are formed in the first connecting piece, two second through holes corresponding to the first through holes are formed in the second connecting piece, and the positioning columns sequentially extend into the first through holes and the second through holes; two third through holes are further formed in the first connecting piece, and when the second connecting piece rotates, the third through holes can correspond to the second through holes; in the same plane, the connecting line between the circle centers of the two third through holes and the connecting line between the circle centers of the two first through holes both pass through the circle center of the connecting shaft and are arranged at an angle alpha, and alpha is larger than or equal to 20 degrees and smaller than or equal to 70 degrees. According to the hinge device, the ladder can be switched among three states, the use modes are more, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the technical field of hardware articles, and particularly relates to a hinge device for a ladder. Background Art

[0002] The existing ladder is a commonly used climbing tool in daily life, with a wide range of applications. It usually has states such as opening and folding, and the opening angle is determined by the hinge device of the ladder. Some ladders can be opened into an A-frame ladder or a straight ladder.

[0003] For example, the utility model patent with the application number CN202020465612.9 discloses an adjustable-angle hinge for fixing an A-frame ladder, including a left hinge and a right hinge. Both the left hinge and the right hinge are L-shaped structures... A fixing bolt is fixedly installed at the lower end of the protruding part on the right side of the left hinge, and a kidney-shaped hole is opened at the lower end of the protruding part on the left side of the right hinge. The fixing bolt is arranged in the kidney-shaped hole, and the rotation angle of the right hinge is limited by the length of the kidney-shaped hole.

[0004] For the adjustable-angle hinge disclosed in this patent, the left hinge and the right hinge are connected by a connecting piece and can rotate around the axis of the connecting piece. The rotation angle is controlled by the cooperation of the fixing bolt and the kidney-shaped hole. Although its overall structure is simple, there are the following problems: 1. Due to the limitation of the kidney-shaped hole, the ladder cannot be unfolded into a straight ladder for use, and its usage method is limited. 2. Since the left hinge and the right hinge only rely on the connecting piece and the fixing bolt to bear force, the ladder cannot bear a large load after being unfolded, and there is a potential safety hazard of the connecting piece breaking after long-term use. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a hinge device for a ladder with more usage methods and high safety.

[0006] To solve the above technical problem, the utility model adopts the following technical scheme:

[0007] A hinge device for a ladder includes a first connecting piece, a second connecting piece, a connecting shaft and a locking piece; the first connecting piece and the second connecting piece are hinged by the connecting shaft;

[0008] The locking piece includes a handle, on which a through column and two positioning columns are provided. The through column extends into the connecting shaft, and the two positioning columns are symmetrically arranged along the through column;

[0009] Two first through holes are provided on the first connecting piece, and two second through holes corresponding to the first through holes are provided on the second connecting piece. The positioning columns sequentially extend into the first through hole and the second through hole;

[0010] Two third through - holes are also provided on the first connecting member. When the second connecting member rotates, the third through - holes can be made to correspond to the second through - holes;

[0011] When in the same plane, the line connecting the centers of the two third through - holes and the line connecting the centers of the two first through - holes both pass through the center of the connecting shaft and are arranged at an angle α, where 20° ≤ α ≤ 70°.

[0012] As a further improvement of the above - mentioned technical solution: A reset member is also provided between the through - column and the connecting shaft for making the positioning column extend into the second through - hole.

[0013] As a further improvement of the above - mentioned technical solution: The reset member is a reset spring. An abutting ring is provided at one end of the through - column away from the handle, and an abutting boss is provided at one end of the connecting shaft close to the handle. The reset spring abuts between the abutting ring and the abutting boss.

[0014] As a further improvement of the above - mentioned technical solution: The through - column is a threaded column, and the abutting ring is a nut provided on the threaded column.

[0015] As a further improvement of the above - mentioned technical solution: An installation hole is provided on the handle. The threaded column passes through the installation hole. A pin is provided on one side of the installation hole, and the threaded column is connected to the handle through the pin.

[0016] As a further improvement of the above - mentioned technical solution: A first hinge disk is provided on the first connecting member, and a second hinge disk is provided on the second connecting member. The first hinge disk is sleeved outside the second hinge disk; The first through - hole and the third through - hole are both provided on the first hinge disk, and the second through - hole is provided on the second hinge disk.

[0017] As a further improvement of the above - mentioned technical solution: A flange is provided at one end of the connecting shaft close to the handle, and a clamping groove is provided at the end away from the handle. A snap ring is provided on the clamping groove. The flange abuts against one side of the first hinge disk, and the snap ring abuts against the other side of the first hinge disk.

[0018] As a further improvement of the above - mentioned technical solution: A plurality of first connection holes are provided on the first connecting member, and a first connection cavity is provided inside; A plurality of second connection holes are provided on the second connecting member, and a second connection cavity is provided inside.

[0019] As a further improvement of the above - mentioned technical solution: A first abutting portion is provided on the first connecting member, and a second abutting portion is provided on the second connecting member. When the second connecting member rotates 180°, the first abutting portion abuts against the second abutting portion.

[0020] As a further improvement of the above technical solution: the positioning post is shorter than the through post, and α is 30°.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] 1. The hinge device for a ladder disclosed in the present utility model is connected to one side of the ladder through a first connecting piece and to the other side of the ladder through a second connecting piece, thereby forming a combined ladder; the second connecting piece can rotate around the connecting shaft, and the rotation range is 0° - 180°, thereby realizing the switching among the folded state, the A-frame ladder state, and the straight ladder state. The α angle determines the included angle between the two sides of the ladder in the A-frame ladder state; when in the initial state, the first connecting piece and the second connecting piece are in the folded state. At this time, the through post is located in the connecting shaft, and the through post extends into the first through hole and the second through hole; when it is necessary to switch to the A-frame ladder state, the positioning post is pulled out through the handle, so that it is separated from the second through hole. After rotating the handle by an α angle, the positioning post extends into the third through hole. At this time, the second connecting piece is rotated. When the second through hole corresponds to the third through hole, the handle can be pressed to make the positioning post extend into the second through hole to achieve locking and positioning. At this time, it is in the A-frame ladder state; when it is necessary to switch to the straight ladder state, the positioning post is pulled out through the handle, so that it is separated from the second through hole. At this time, the second connecting piece is rotated to be arranged in a straight line with the first connecting piece, and at the same time, the second through hole corresponds to the first through hole. The handle can be pressed to make the positioning post extend into the second through hole to achieve locking and positioning. At this time, it is in the straight ladder state; this hinge device can enable the ladder to realize the switching of three states, and has more usage methods. And when in use, the connecting shaft and the two positioning posts bear the load simultaneously, which can enhance the strength of the ladder, reduce potential safety hazards, and has high safety.

[0023] 2. For the hinge device for a ladder disclosed in the present utility model, further, when the second connecting piece is rotated for state switching, at this time, the positioning post is separated from the second through hole. During the rotation of the second connecting piece, when the second through hole is aligned with the first through hole or the third through hole, the through post is made to continue to extend into the connecting shaft through the resetting member, and finally the positioning post extends into the second through hole; through the setting of the resetting member, when the second through hole rotates in place, automatic locking and positioning are realized, the structure is simple, the operation is convenient, and there is no need for manual operation of pressing the handle again.

[0024] 3. For the hinge device for a ladder disclosed in the present utility model, furthermore, when the second connecting piece rotates and opens to the straight state, the first abutting portion abuts against the second abutting portion, so that it can better bear the load and improve the safety of the ladder. Description of the Drawings

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the folded state of the hinge device for a ladder in the present utility model.

[0026] Figure 2 This is a partial sectional structural schematic diagram of the folding state of the hinge device for a ladder in the present utility model.

[0027] Figure 3 This is a three-dimensional structural schematic diagram of the X-shaped ladder state of the hinge device for a ladder in the present utility model.

[0028] Figure 4 This is a three-dimensional structural schematic diagram of the straight ladder state of the hinge device for a ladder in the present utility model.

[0029] Figure 5 This is a structural schematic diagram of the first connecting member in the hinge device for a ladder in the present utility model.

[0030] Figure 6 This is a structural schematic diagram of the second connecting member in the hinge device for a ladder in the present utility model.

[0031] Figure 7 This is an exploded structural schematic diagram of the positioning member, connecting shaft and reset member in the hinge device for a ladder in the present utility model.

[0032] Each reference numeral in the figure represents: 10, the first connecting member; 11, the first hinge disc; 111, the first through hole; 112, the third through hole; 12, the first connecting hole; 13, the first connecting cavity; 14, the first abutting portion; 20, the second connecting member; 21, the second hinge disc; 211, the second through hole; 22, the second connecting hole; 23, the second connecting cavity; 24, the second abutting portion; 30, the connecting shaft; 31, the abutting boss; 32, the flange; 33, the card slot; 34, the circlip; 40, the locking member; 41, the handle; 42, the passing column; 43, the positioning column; 44, the abutting ring; 45, the plug; 50, the reset member. Detailed implementation manners

[0033] The following further elaborates on the present utility model in detail in conjunction with the specification drawings and specific embodiments.

[0034] As shown in the present disclosure and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include plural. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0035] Figures 1 to 7 An embodiment of the present utility model is shown. The hinge device for a ladder in this embodiment includes a first connecting member 10, a second connecting member 20, a connecting shaft 30, and a locking member 40; the first connecting member 10 and the second connecting member 20 are hinged by the connecting shaft 30;

[0036] The locking member 40 includes a handle 41. The handle 41 is provided with a through column 42 and two positioning columns 43. The through column 42 extends into the connecting shaft 30, and the two positioning columns 43 are symmetrically arranged along the through column 42;

[0037] The first connecting member 10 is provided with two first through holes 111, and the second connecting member 20 is provided with two second through holes 211 corresponding to the first through holes 111. The positioning columns 43 sequentially extend into the first through holes 111 and the second through holes 211;

[0038] The first connecting member 10 is further provided with two third through holes 112. When the second connecting member 20 rotates, the third through holes 112 can be made to correspond to the second through holes 211;

[0039] When in the same plane, the line connecting the centers of the two third through holes 112 and the line connecting the centers of the two first through holes 111 both pass through the center of the connecting shaft 30 and are arranged at an angle α, where 20° ≤ α ≤ 70°.

[0040] This hinge device for a ladder is connected to one side of the ladder through the first connecting member 10 and to the other side of the ladder through the second connecting member 20, thereby forming a combined ladder; the second connecting member 20 can rotate around the connecting shaft 30, and the rotation range is 0° - 180°, thereby realizing the switching among the folded state, the A-frame ladder state, and the straight ladder state. As shown, the α angle determines the included angle between the two sides of the ladder in the A-frame ladder state; when in the initial state, the first connecting member 10 and the second connecting member 20 are in the folded state. At this time, the through column 42 is located in the connecting shaft 30, and the through column 42 extends into the first through hole 111 and the second through hole 211; when it is necessary to switch to the A-frame ladder state, the positioning columns 43 are pulled out through the handle 41 to separate them from the second through holes 211, as shown in Figure 5 and Figure 3 and Figure 5As shown, after the handle 41 is rotated counterclockwise by an angle α, the positioning post 43 extends into the third through hole 112. At this time, the second connecting member 20 is rotated counterclockwise. When the second through hole 211 corresponds to the third through hole 112, the handle 41 can be pressed to make the positioning post 43 extend into the second through hole 211 to achieve locking and positioning. At this time, it is in the state of an A-frame ladder; when it is necessary to switch to the state of a straight ladder, the positioning post 43 is pulled out through the handle 41 to separate it from the second through hole 211. At this time, the second connecting member 20 is rotated to be arranged in a straight line with the first connecting member 10. At the same time, the second through hole 211 corresponds to the first through hole 111, and the handle 41 can be pressed to make the positioning post 43 extend into the second through hole 211 to achieve locking and positioning. At this time, it is in the state of a straight ladder; this hinge device can enable the ladder to switch among three states, with more usage methods. And during use, the connecting shaft 30 and the two positioning posts 43 bear the load simultaneously, which can enhance the strength of the ladder, reduce potential safety hazards, and have high safety.

[0041] In this embodiment, the positioning post 43 is shorter than the through column 42. Therefore, when the positioning post 43 is pulled out and separated from the second through hole 211, the through column 42 is still inside the connecting shaft 30.

[0042] In this embodiment, a reset member 50 is further provided between the through column 42 and the connecting shaft 30 for making the positioning post 43 extend into the second through hole 211. Specifically, when the second connecting member 20 is rotated for state switching, at this time the positioning post 43 is separated from the second through hole 211. During the rotation of the second connecting member 20, when the second through hole 211 is aligned with the first through hole 111 or the third through hole 112, the through column 42 is made to continue extending into the connecting shaft 30 through the reset member 50, and finally the positioning post 43 extends into the second through hole 211; through the setting of the reset member 50, when the second through hole 211 rotates in place, automatic locking and positioning are achieved, with a simple structure and convenient operation, without the need for manual operation of pressing the handle 41 again.

[0043] In this embodiment, the reset member 50 is preferably a reset spring. An abutting ring 44 is provided at one end of the through column 42 away from the handle 41, and an abutting boss 31 is provided at one end of the connecting shaft 30 close to the handle 41. The reset spring abuts between the abutting ring 44 and the abutting boss 31. Specifically, when it is necessary to switch the state, hold the handle 41 to overcome the action of the elastic force, pull out the positioning post 43 to separate it from the second through hole 211. At this time, the second connecting member 20 can rotate. Rotate the handle 41 to make the positioning post 43 extend into the third through hole 112 or the first through hole 111. After the second connecting member 20 rotates in place, due to the action of the elastic force, the positioning post 43 automatically extends into the second through hole 211, thus achieving automatic locking and positioning, and the reset spring has high reliability.

[0044] In this embodiment, the through-column 42 is a threaded column, and the abutting ring 44 is a nut provided on the threaded column. Specifically, during product assembly, the return spring can be first placed into the connecting shaft 30, and then the nut is installed. This design enables better assembly, with reasonable installation steps, and the elastic force can be adjusted by adjusting the position of the nut on the threaded column.

[0045] In this embodiment, the handle 41 is provided with a mounting hole, the threaded column passes through the mounting hole, and a pin 45 is provided on one side of the mounting hole. The threaded column is connected to the handle 41 through the pin 45. Specifically, the connection between the threaded column and the handle 41 is realized through the pin 45, which facilitates assembly and simplifies the structure for easy processing and forming.

[0046] In this embodiment, the first connecting member 10 is provided with a first hinge disk 11, the second connecting member 20 is provided with a second hinge disk 21, and the first hinge disk 11 is sleeved outside the second hinge disk 21; both the first through-hole 111 and the third through-hole 112 are provided on the first hinge disk 11, and the second through-hole 211 is provided on the second hinge disk 21. Specifically, the first hinge disk 11 has a cavity, the second hinge disk 21 extends into this cavity, and the hinge can be better realized through the first hinge disk 11 and the second hinge disk 21.

[0047] In this embodiment, one end of the connecting shaft 30 close to the handle 41 is provided with a flange 32, the other end far from the handle 41 is provided with a clamping groove 33, and a snap ring 34 is provided on the clamping groove 33. The flange 32 abuts against one side of the first hinge disk 11, and the snap ring 34 abuts against the other side of the first hinge disk 11. Specifically, when assembling the connecting shaft 30, after one end of the connecting shaft 30 passes through the first hinge disk 11 and the second hinge disk 21, the flange 32 abuts against one side of the first hinge disk 11, and then the connecting shaft 30 is installed and fixed through the snap ring 34 at the other end. The structure is simple and the installation is convenient.

[0048] In this embodiment, the first connecting member 10 is provided with a plurality of first connecting holes 12 and internally provided with a first connecting cavity 13; the second connecting member 20 is provided with a plurality of second connecting holes 22 and internally provided with a second connecting cavity 23. Specifically, the corresponding ladder is connected through the plurality of first connecting holes 12 and second connecting holes 22, and part of the ladder can extend into the corresponding first connecting cavity 13 and second connecting cavity 23, thereby strengthening the connection effect.

[0049] In this embodiment, the first connecting member 10 is provided with a first abutting portion 14, the second connecting member 20 is provided with a second abutting portion 24, and when the second connecting member 20 rotates 180°, the first abutting portion 14 abuts against the second abutting portion 24. Specifically, when the second connecting member 20 rotates and opens to a straight state, the first abutting portion 14 abuts against the second abutting portion 24, so that the load can be better borne and the safety of the ladder can be improved.

[0050] As Figure 5 shown, in this embodiment, α is preferably 30°, and this included angle can make the folding ladder relatively firm. In other embodiments, more through holes can also be provided to achieve adjustment of more folding ladder inclination angles, so as to adapt to different usage scenarios.

[0051] In this embodiment, both the first connecting member 10 and the second connecting member 20 are respectively composed of two shells, which is convenient for processing and forming.

[0052] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the technical content disclosed above, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model without departing from the technical solution of the present utility model shall fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A hinge device for a ladder, characterized in that: It includes a first connecting member (10), a second connecting member (20), a connecting shaft (30) and a locking member (40); the first connecting member (10) and the second connecting member (20) are hinged by the connecting shaft (30); The locking member (40) includes a handle (41), on which there is a through-column (42) and two positioning columns (43), the through-column (42) extends into the connecting shaft (30), and the two positioning columns (43) are symmetrically arranged along the through-column (42); There are two first through-holes (111) on the first connecting member (10), and two second through-holes (211) corresponding to the first through-holes (111) on the second connecting member (20), and the positioning columns (43) sequentially extend into the first through-holes (111) and the second through-holes (211); There are also two third through-holes (112) on the first connecting member (10), and when the second connecting member (20) rotates, the third through-holes (112) can be made to correspond to the second through-holes (211); When in the same plane, the connection line between the centers of the two third through-holes (112) and the connection line between the centers of the two first through-holes (111) both pass through the center of the connecting shaft (30) and are arranged at an angle α, 20° ≤ α ≤ 70°.

2. The hinge device for a ladder according to claim 1, characterized in that: There is also a reset member (50) between the through-column (42) and the connecting shaft (30) for making the positioning column (43) extend into the second through-hole (211).

3. The hinge device for a ladder according to claim 2, characterized in that: The reset member (50) is a reset spring, one end of the through-column (42) away from the handle (41) is provided with an abutting ring (44), and one end of the connecting shaft (30) close to the handle (41) is provided with an abutting boss (31), and the reset spring abuts between the abutting ring (44) and the abutting boss (31).

4. The hinge device for a ladder according to claim 3, characterized in that: The through-column (42) is a threaded column, and the abutting ring (44) is a nut provided on the threaded column.

5. The hinge device for a ladder according to claim 4, characterized in that: There is a mounting hole on the handle (41), the threaded column passes through the mounting hole, and a pin (45) is provided on one side of the mounting hole, and the threaded column is connected to the handle (41) through the pin (45).

6. The hinge device for a ladder according to any one of claims 1 to 5, characterized in that: There is a first hinge disc (11) on the first connecting member (10), and a second hinge disc (21) on the second connecting member (20), and the first hinge disc (11) is sleeved outside the second hinge disc (21); the first through-hole (111) and the third through-hole (112) are both provided on the first hinge disc (11), and the second through-hole (211) is provided on the second hinge disc (21).

7. The hinge device for a ladder according to claim 6, characterized in that: One end of the connecting shaft (30) close to the handle (41) is provided with a flange (32), and the end away from the handle (41) is provided with a clamping groove (33), and a snap ring (34) is provided on the clamping groove (33), the flange (32) abuts against one side of the first hinge disc (11), and the snap ring (34) abuts against the other side of the first hinge disc (11).

8. The hinge device for a ladder according to any one of claims 1 to 5, characterized in that: The first connecting member (10) is provided with a plurality of first connecting holes (12) and has a first connecting cavity (13) inside; the second connecting member (20) is provided with a plurality of second connecting holes (22) and has a second connecting cavity (23) inside.

9. The hinge device for a ladder according to any one of claims 1 to 5, characterized in that: The first connecting member (10) is provided with a first abutting portion (14), and the second connecting member (20) is provided with a second abutting portion (24). When the second connecting member (20) rotates 180°, the first abutting portion (14) abuts against the second abutting portion (24).

10. The hinge device for a ladder according to any one of claims 1 to 5, characterized in that: The positioning post (43) is shorter than the passing post (42), and α is 30°.

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