Locking device convenient for locking and unlocking ladder

Abstract

The invention discloses a locking device convenient for locking and unlocking a ladder. The locking device comprises an elastic locking piece and a pair of hinge structures, wherein the two hinge structures are symmetrically arranged on the left side and the right side of the ladder; the hinge structure comprises a first connecting piece and a second connecting piece rotationally arranged on the first connecting piece. Positioning grooves corresponding to different states of the ladder are formed in the outer edge of the head rotating disc of the second connecting piece; the elastic locking piece comprises an elastic piece and an unlocking rod arranged in the left-right direction, and the two ends of the unlocking rod are arranged corresponding to any set of positioning grooves in the left-right hinge structure at the same time. And the elastic piece acts on the unlocking rod, so that the two ends of the unlocking rod keep a movement trend of being clamped into the positioning grooves. According to the scheme, locking and unlocking of the ladder state are achieved through the unlocking rod, unlocking of the ladder state can be achieved by pulling the unlocking rod downwards, locking of the ladder state can be achieved by loosening the unlocking rod, operation is easy, and time and labor are saved.

Description

Technical Field

[0001] The invention relates to a climbing tool, in particular to a locking device which is convenient for locking and unlocking a ladder. Background Art

[0002] Ladders are a common climbing tool in daily work and life, and are widely used. Generally, according to the style of the ladder, it can be divided into straight ladders, herringbone ladders, telescopic ladders, handrail ladders, triangular ladders, lift ladders, etc.

[0003] At present, a multifunctional ladder has appeared on the market, which has an unfolded state and a folded state. When unfolded, it can present a herringbone ladder state or a straight ladder state, and when folded, it presents a straight ladder state; the multifunctional ladder comprises a front ladder frame, a rear ladder frame and a locking device, the upper parts of the front and rear ladder frames are hinged, and the relative positions of the front and rear ladder frames are adjusted and locked by the locking device, so that the multifunctional ladder presents different states; the locking device is provided with a pair, and the two locking devices are respectively arranged at the hinges at the left and right ends of the front and rear ladder frames. When unlocking, it is necessary to operate the operating handles at the left and right ends respectively, that is, to operate twice to achieve the unlocking of the multifunctional ladder state; when locking, it is also necessary to operate the operating handles at the left and right ends respectively, that is, to operate twice to achieve the adjustment and locking of the multifunctional ladder state; this unlocking and locking method is cumbersome to operate, time-consuming and labor-intensive.

[0004] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a subject to be studied and solved by the present invention. Summary of the invention

[0005] An object of the present invention is to provide a locking device which facilitates the locking and unlocking of a ladder.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a locking device for facilitating the locking and unlocking of a ladder, the ladder comprising a main ladder frame and an auxiliary ladder frame connected in rotation, having an unfolded straight ladder state and a herringbone ladder state, and a folded straight ladder state, the locking device comprising an elastic locking member and a pair of hinge structures; wherein the two hinge structures are symmetrically arranged on the left and right sides of the ladder; The hinge structure includes a first connecting piece and a second connecting piece; the first connecting piece includes a tail portion fixedly connected to the ladder column of the main ladder frame, and a head portion which is a fixed plate; The second connecting piece includes a tail portion fixedly connected to the ladder column of the auxiliary ladder frame, and a head portion of the rotating disk, wherein the rotating disk and the fixed disk are overlapped in the thickness direction of the two, and the rotating disk is rotatably arranged on the fixed disk around its disk center; at least three positioning grooves are provided on the outer edge of the rotating disk, wherein the first positioning groove corresponds to the herringbone ladder state of the ladder, the second positioning groove corresponds to the straight ladder state of the ladder in the unfolded state, and the third positioning groove corresponds to the straight ladder state of the ladder in the folded state; The elastic locking member includes an elastic member and an unlocking rod arranged along the left and right directions, and both ends of the unlocking rod are arranged corresponding to any set of positioning grooves in the left and right hinge structures; The elastic member acts on the unlocking rod, so that the two ends of the unlocking rod maintain a movement tendency of being inserted into the positioning groove.

[0007] In the above scheme, when adjusting the state of the ladder, the ladder is first unlocked. First, the unlocking rod is pulled downward so that the unlocking rod overcomes the elastic force of the elastic member and moves downward, so that the two ends of the unlocking rod are separated from the positioning grooves corresponding to the current state of the ladder. Then, the second connecting pieces on the left and right sides are rotated so that the positioning grooves corresponding to the next state are aligned with the unlocking rod. Then, the unlocking rod is released, and the unlocking rod is snapped into the positioning grooves in the next state under the action of the elastic member, thereby locking the ladder in the next state.

[0008] A further technical solution is that the rotating disk is coaxially arranged with the fixed disk, and the diameter of the rotating disk is larger than the diameter of the fixed disk; the tail of the first connecting piece includes a horizontal plate integrally formed with the head and a side plate integrally formed with the horizontal plate, and the two plates make the tail present a 7 shape; the left and right ends of the unlocking rod extend toward the side plates respectively, and the unlocking rod is limited to be located below the horizontal plate.

[0009] According to a further technical solution, the elastic locking member also includes a positioning seat, a guide rod fixed on the positioning seat, and a sleeve mounted on the guide rod; the positioning seat is relatively fixed to the inner side of the tail of the first connecting piece; the elastic member is a compression spring mounted on the guide rod, the lower end of the compression spring is positioned against the guide rod, and the upper end is positioned against the sleeve; the lower surface of the unlocking rod is positioned against the sleeve.

[0010] A further technical solution is that a clearance groove is provided on the positioning seat to avoid the unlocking rod when the unlocking rod moves downward. The setting of the clearance groove also provides a guiding effect for the unlocking rod when it moves up and down, ensuring the accuracy of the unlocking rod's up and down displacement process.

[0011] According to a further technical solution, a limit plate is provided on the positioning seat at the front end of the unlocking rod, the upper end of which is fixedly connected to the positioning seat and the lower end of which extends downward. The setting of the limit plate prevents the unlocking rod from having position deviation in the left and right directions during the repeated displacement up and down, causing one end of the unlocking rod to be disengaged from the positioning seat, thereby affecting the stability and safety of the ladder.

[0012] According to a further technical solution, the elastic member is a compression spring, a tension spring or an elastic rubber ring.

[0013] According to a further technical solution, the first connecting piece is fixed to the upper part of the ladder column of the main ladder frame, and the two are cross-arranged; the second connecting piece is fixed to the upper end of the ladder column of the auxiliary ladder frame, and is located in the length direction of the ladder column of the auxiliary ladder frame.

[0014] The advantages of the present invention compared to the prior art are as follows: In this case, the locking and unlocking of the ladder state are both achieved through an unlocking rod. When unlocking, the unlocking rod is pulled downward to disengage the unlocking rod from the positioning groove in the current state of the ladder, and then the rotating disk is rotated to the next state of the ladder, and the unlocking rod is released, and the unlocking rod is stuck in the positioning groove in the next state, so that the ladder can be locked in the next state. The operation is simple, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a partial structural schematic diagram of the ladder in the state of a herringbone ladder according to an embodiment of the present invention; Attached Figure 2 It is a schematic diagram of a part of the structure of the ladder in the herringbone ladder state from a side view of an embodiment of the present invention; Attached Figure 3 This is a schematic diagram of the structure of a locking device according to an embodiment of the present invention; Attached Figure 4 It is a schematic structural diagram of a hinge structure and an unlocking lever according to an embodiment of the present invention; Attached Figure 5 For attachment Figure 4 Exploded diagram of Attached Figure 6 It is a structural schematic diagram of the locking device of the ladder in the embodiment of the present invention when the ladder is in the straight ladder state when folded; Attached Figure 7 It is a structural schematic diagram of the locking device of the ladder in the unfolded herringbone ladder state according to the embodiment of the present invention; Attached Figure 8 It is a schematic structural diagram of the locking device of the ladder according to the embodiment of the present invention when the ladder is in the straight ladder state when it is unfolded.

[0016] In the above drawings: 1. main ladder frame; 2. auxiliary ladder frame; 3. first connecting plate; 3a. first connecting plate; 4. second connecting plate; 4a. first connecting plate; 5. first positioning groove; 6. second positioning groove; 7. third positioning groove; 8. unlocking rod; 9. elastic member; 10. horizontal plate; 11. side plate; 12. positioning seat; 13. guide rod; 14. sleeve; 15. clearance groove; 16. limiting plate. Implementation

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0018] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0019] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0020] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0021] The terms "including", "having", etc. used in this document are open-ended terms, meaning including but not limited to.

[0022] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0023] The terms "front", "back", "up", "down", "left", "right", etc. used in this article are all directional terms. In this case, they are only used to illustrate the positional relationship between the various structures, and are not used to limit the protection plan of this case and the specific direction during actual implementation.

[0024] See attached Figure 1-8 As shown, a locking device for facilitating the locking and unlocking of a ladder, the ladder comprises a main ladder frame 1 and an auxiliary ladder frame 2 arranged in the front-to-back direction and rotatably connected, the ladder has an unfolded straight ladder state and a herringbone ladder state, and a folded straight ladder state. The locking device comprises an elastic locking member and a pair of hinge structures; wherein the two hinge structures are respectively arranged on the left and right sides of the ladder, and the two hinge structures are symmetrical on the left and right sides.

[0025] The hinge structure includes a first connecting plate 3 and a second connecting plate 4; the first connecting plate 3 is fixedly arranged on the upper part of the ladder column of the main ladder frame 1, including a tail portion fixedly connected to the ladder column of the main ladder frame 1, and a head portion which is a fixed plate 3a; wherein the first connecting plate 3 is cross-arranged with the ladder column of the main ladder frame 1.

[0026] The second connecting piece 4 is fixedly arranged at the upper end of the ladder column of the auxiliary ladder frame 2 and is located in the length direction of the ladder column of the auxiliary ladder frame 2. The second connecting piece 4 includes a tail portion fixedly connected to the ladder column of the auxiliary ladder frame 2 and a head portion of a rotating disk 4a, wherein the rotating disk 4a and the fixed disk 3a are overlapped in the thickness direction of the two, and the rotating disk 4a is rotated around its disk center and is arranged on the fixed disk 3a; at least three positioning grooves are provided on the outer edge of the rotating disk 4a, wherein the first positioning groove 5 corresponds to the herringbone ladder state of the ladder, the second positioning groove 6 corresponds to the straight ladder state of the ladder in the unfolded state, and the third positioning groove 7 corresponds to the straight ladder state of the ladder in the folded state.

[0027] The elastic locking member includes an elastic member 9 and an unlocking rod 8 arranged in the left and right directions, and both ends of the unlocking rod 8 are arranged corresponding to any set of positioning grooves in the left and right hinge structures; the elastic member 9 acts on the unlocking rod 8 to keep the two ends of the unlocking rod 8 in a movement tendency of being stuck in the positioning grooves. The elastic member 9 can be one of a compression spring, a tension spring or an elastic rubber ring, and in this case, it is a compression spring.

[0028] The rotating disk 4a and the fixed disk 3a are coaxially arranged. When the diameter of the rotating disk 4a is less than or equal to the fixed disk 3a (not shown in the figure), a waist-shaped hole for the end of the unlocking rod 8 to be inserted can be opened on the fixed disk 3a, and the two ends of the elastic member respectively abut against the inner wall of the waist-shaped hole and the unlocking rod 8.

[0029] In this case, the diameter of the rotating disk 4a is greater than or equal to the fixed disk 3a. Specifically, the tail of the first connecting piece 3 includes a horizontal plate 10 integrally formed with the head and a side plate 11 integrally formed with the horizontal plate 10, and the two plates make the tail present a 7 shape; the elastic locking member also includes a positioning seat 12, a guide rod 13 fixed on the positioning seat 12, and a sleeve 14 sleeved on the guide rod 13; the positioning seat 12 is relatively fixed to the inner side of the tail of the first connecting piece 3; the elastic member 9 is a compression spring sleeved on the guide rod 13, the lower end of the compression spring is abutted and positioned on the guide rod 13, and the upper end is abutted and positioned on the sleeve 14; the left and right ends of the unlocking rod 8 extend toward the side plates 11 respectively, and the upper surface of the unlocking rod 8 is limited to the bottom of the horizontal plate 10, and the lower surface is abutted and positioned on the sleeve 14.

[0030] The positioning seat 12 is provided with a clearance groove 15, which makes way for the unlocking rod 8 when the unlocking rod 8 moves downward. The positioning seat 12 is also provided with a limit plate 16 at the front end of the unlocking rod 8, the upper end of which is fixedly connected to the positioning seat 12, and the lower end of which extends downward. The setting of the limit plate 16 prevents the unlocking rod 8 from having position deviation in the left and right directions during the repeated displacement up and down, so that one end of the unlocking rod 8 is disengaged from the positioning seat 12, thereby affecting the stability and safety of the ladder.

[0031] According to the above structural composition, the specific working principle of the present invention is described as follows: If you want to adjust the ladder from the herringbone ladder state to the straight ladder state in the unfolded state: The first step is to unlock the ladder in the form of a herringbone ladder. First, pull the unlocking rod 8 downward so that the unlocking rod 8 overcomes the elastic force of the elastic member 9 and moves downward until the two ends of the unlocking rod 8 are outwardly disengaged from the left and right first positioning grooves 5. At this time, the locking device releases the lock on the herringbone ladder state.

[0032] In the second step, rotate the second connecting pieces 4 on the left and right sides so that the two second positioning grooves 6 are rotated to align with the unlocking rod 8, and release the unlocking rod 8. The unlocking rod 8 is inserted into the second positioning groove 6 under the action of the elastic member 9. At this time, the locking device realizes locking of the ladder in the straight ladder state when the ladder is unfolded.

[0033] In this case, the locking and unlocking of the ladder state are both achieved through an unlocking rod 8. Pulling the unlocking rod 8 downwards can unlock the ladder state, and releasing the unlocking rod 8 can lock the ladder state. The operation is simple, saving time and effort.

[0034] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A locking device for facilitating locking and unlocking of a ladder, the ladder comprising a main ladder frame (1) and an auxiliary ladder frame (2) which are rotatably connected, the ladder having an unfolded straight ladder state and a herringbone ladder state, and a folded straight ladder state, characterized in that: The locking device comprises an elastic locking member and a pair of hinge structures; wherein the two hinge structures are symmetrically arranged on the left and right sides of the ladder; The hinge structure comprises a first connecting piece (3) and a second connecting piece (4); the first connecting piece (3) comprises a tail portion fixedly connected to a ladder post of the main ladder frame (1), and a head portion serving as a fixing plate (3a); The second connecting piece (4) comprises a tail portion fixedly connected to the ladder column of the auxiliary ladder frame (2), and a head portion of a rotating disk (4a), wherein the rotating disk (4a) and the fixed disk (3a) are overlapped in the thickness direction of the two, and the rotating disk (4a) is rotatably arranged on the fixed disk (3a) around its disk center; at least three positioning grooves are provided on the outer edge of the rotating disk (4a), wherein the first positioning groove (5) corresponds to the herringbone ladder state of the ladder, the second positioning groove (6) corresponds to the straight ladder state of the ladder in the unfolded state, and the third positioning groove (7) corresponds to the straight ladder state of the ladder in the folded state; The elastic locking member comprises an elastic member (9) and an unlocking rod (8) arranged along the left and right directions, and both ends of the unlocking rod (8) are arranged corresponding to any one set of positioning grooves in the left and right hinge structures; The elastic member (9) acts on the unlocking rod (8) so that the two ends of the unlocking rod (8) maintain a movement tendency to be engaged in the positioning grooves.

2. The locking device for facilitating locking and unlocking of a ladder according to claim 1, characterized in that: The rotating disk (4a) is coaxially arranged with the fixed disk (3a), and the diameter of the rotating disk (4a) is greater than the diameter of the fixed disk (3a); The tail portion of the first connecting piece (3) comprises a horizontal plate (10) integrally formed with the head portion and a side plate (11) integrally formed with the horizontal plate (10), the two plates forming the tail portion in a 7-shape; The left and right ends of the unlocking rod (8) extend towards the side plate (11) respectively, and the unlocking rod (8) is located below the horizontal plate (10).

3. The locking device for facilitating locking and unlocking of a ladder according to claim 2, characterized in that: The elastic locking member further comprises a positioning seat (12), a guide rod (13) fixed on the positioning seat (12), and a sleeve (14) sleeved on the guide rod (13); the positioning seat (12) is relatively fixed to the inner side of the tail of the first connecting piece (3); The elastic member (9) is a compression spring sleeved on the guide rod (13), the lower end of the compression spring abuts against and is positioned on the guide rod (13), and the upper end abuts against the sleeve (14); The lower surface of the unlocking rod (8) is positioned against the sleeve (14).

4. The locking device for facilitating locking and unlocking of a ladder according to claim 3, characterized in that: The positioning seat (12) is provided with a clearance groove (15) for making way for the unlocking rod (8) when the unlocking rod (8) moves downward.

5. The locking device for facilitating locking and unlocking of a ladder according to claim 3, characterized in that: A limiting plate (16) is also provided on the positioning seat (12) at the front end of the unlocking rod (8), wherein the upper end of the limiting plate (16) is fixedly connected to the positioning seat (12) and the lower end extends downward.

6. The locking device for facilitating locking and unlocking of a ladder according to claim 1, characterized in that: The elastic member (9) is one of a compression spring, a tension spring or an elastic rubber ring.

7. The locking device for facilitating locking and unlocking of a ladder according to claim 1, characterized in that: The first connecting piece (3) is fixedly mounted on the upper part of the ladder column of the main ladder frame (1), and the two are arranged crosswise; The second connecting piece (4) is fixedly arranged on the upper end of the ladder column of the auxiliary ladder frame (2) and is located in the length direction of the ladder column of the auxiliary ladder frame (2).

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