Locking assembly and platform ladder

Abstract

The utility model relates to the technical field of platform ladders, in particular to a locking assembly and a platform ladder, the locking assembly is arranged aiming at the platform ladder, the platform ladder comprises a platform ladder main body and a guardrail assembly, the platform ladder main body is provided with a sliding groove, and the two end parts of the sliding groove are expanded into large head ends; the locking assembly comprises a mounting seat, a sliding rod, a connecting piece and an elastic element; a through hole for the sliding rod to penetrate through is formed in the mounting seat, and one end of the through hole is in butt joint with the sliding groove; the head end of the sliding rod penetrates through the sliding groove and the through hole of the installation base and then is connected with the connecting piece in a positioning mode, and the connecting piece protrudes in the radial direction of the sliding rod. The end face, facing the connecting piece, of the mounting base is provided with an abutting face matched with the connecting piece. Moreover, a first matching part and a second matching part are distributed in the length direction of the sliding rod, and the first matching part is closer to the head end of the sliding rod than the second matching part; and the elastic element acts on the sliding rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to platform ladder technical field, concretely relates to locking assembly and platform ladder. BACKGROUND

[0002] Platform ladder is an important climbing tool, usually including platform ladder main part and guardrail assembly. The setting of guardrail assembly aims at providing safety guarantee for users, preventing falling due to body imbalance in the use process. In the storage and transportation process of platform ladder, if the guardrail assembly remains original, it will often be set out along the length direction of platform ladder, which not only increases the difficulty of carrying, but also may be damaged due to collision or space limitation. Therefore, designing a mechanism capable of moving guardrail assembly flexibly to unfold to provide protection when needed and to fold to reduce space occupation when not needed becomes the key to improve the practicality of platform ladder.

[0003] In the prior art, a common solution is to set a socket on the guardrail assembly and platform ladder main body respectively and generally set at least two sockets on the platform ladder main body, and the detachable connection of the two is realized by a pin to lock the guardrail assembly. Although this design is simple in structure and easy to operate, it has safety hazards in actual application. Specifically, the connection between the pin and the socket often lacks sufficient stability and reliability, and is easy to separate accidentally due to vibration, misoperation or wear caused by long-term use. Once the pin falls off, the guardrail assembly will lose support and the user may face the risk of falling without protection.

[0004] Therefore, how to solve the above-mentioned safety hazards of the locking structure in the prior art has become the subject to be studied and solved by the utility model. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a locking assembly and platform ladder.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0007] A locking assembly is provided for platform ladder, the platform ladder includes platform ladder main body and guardrail assembly, the platform ladder main body is equipped with sliding groove, and the both ends of the sliding groove are expanded into large end; characterized in that:

[0008] The locking assembly includes mounting seat, sliding rod, connecting piece and elastic element;

[0009] The mounting seat is used as a mechanism for connecting with the guardrail assembly; the mounting seat is equipped with through hole for the sliding rod to pass through, and one end of the through hole is connected with the sliding groove;

[0010] The first end of the sliding rod passes through the through hole of the mounting seat and is connected with the connecting piece, and the connecting piece protrudes in the radial direction of the sliding rod; the end surface of the mounting seat facing the connecting piece is provided with an abutting surface matched with the connecting piece, and at least two matching surfaces, i.e., a first matching surface and a second matching surface, are distributed around the axis of the sliding rod on the abutting surface; the first matching surface is closer to the first end side of the sliding rod than the second matching surface; and the first matching part and the second matching part are arranged in the length direction of the sliding rod, and the first matching part is closer to the first end of the sliding rod than the second matching part; the size of the first matching part is smaller than the middle width of the sliding groove, and the size of the second matching part is larger than the middle width of the sliding groove and smaller than the size of the large end; and the tail end of the sliding rod serves as an operation end;

[0011] The elastic element acts on the sliding rod to make the sliding rod have a tendency to exit the through hole of the mounting seat, so that the connecting piece abuts against the abutting surface;

[0012] In this way, the locking assembly is configured to have a locked state and an unlocked state; in the locked state, the connecting piece is matched with the first matching surface to make the second matching part be in any one of the large ends, so as to limit the movement of the entire locking assembly and the guardrail assembly along the length direction of the sliding groove; in the unlocked state, the connecting piece is matched with the second matching surface to make the second matching part exit the large end and make the first matching part match with the large end, so that the entire locking assembly and the guardrail assembly can move along the length direction of the sliding groove; the locked state and the unlocked state of the locking assembly are switched by rotating the operation end of the sliding rod.

[0013] In the above scheme, in the locking stage, the second matching part is in any one of the large ends to limit the movement of the first matching part in the up-down direction (i.e., the length extension direction of the sliding groove), and the connecting piece is matched with the first matching surface to limit the movement of the first matching part to the outside (i.e., the length extension direction of the through hole), so as to realize the locking of the guardrail assembly; in the unlocking stage, the connecting piece is matched with the second matching surface (the connecting piece needs to be rotated first), and the second matching part is separated from any one of the large ends, at this time, the first matching part can be freely inserted into any one of the large ends and any part of the sliding groove, so that the position of the mounting seat and the guardrail assembly can be adjusted. Through the above arrangement, the guardrail assembly can be quickly locked and unlocked through a simple structure, and through the above safety mechanism, the locking assembly is prevented from being easily switched from the locked state to the unlocked state, thereby reducing the safety risk.

[0014] In a further technical solution, the locking assembly further comprises a handle and a mounting piece; the handle is mounted on the operation end of the sliding rod through the mounting piece.

[0015] In a further technical solution, the elastic element is a mechanical compression spring.

[0016] The further technical solution further comprises a guide member.

[0017] The further technical solution is characterized in that the connecting member is a shaft pin fixed to the first end of the sliding rod in the radial direction; the abutting surface is correspondingly matched with the two ends of the shaft pin, and the abutting surface is configured as two symmetrical clamping grooves on a circular surface, the circular surface being the first matching surface, and the groove bottom of the clamping groove being the second matching surface.

[0018] The further technical solution is characterized in that the opening of the clamping groove is a horn opening.

[0019] The further technical solution is characterized in that the connecting member is a threaded cylindrical pin, and the first matching part is provided with a through hole corresponding to the threaded cylindrical pin.

[0020] The further technical solution is characterized in that the middle part of the sliding groove is a square groove, and the large end is a circular hole; the first matching part and the second matching part are both cylindrical structures.

[0021] The further technical solution is characterized in that the platform ladder further comprises a platform ladder body and a guardrail assembly, and the platform ladder body is provided with a sliding groove, and the two end parts of the sliding groove are expanded into large ends.

[0022] The middle part of the sliding groove is a square groove, and the large end is a circular hole.

[0023] The terms "first", "second", and the like as used herein do not necessarily have a specific order or sequence meaning, nor are they used to limit the present application. They are only used to distinguish components or operations described by the same technical terms.

[0024] The terms "connected" or "positioned" as used herein can mean that two or more components or devices are in direct physical contact with each other or are indirectly in physical contact with each other, or can mean that two or more components or devices operate or act on each other.

[0025] The terms "connected", "including", "having", and the like as used herein are open terms, i.e., they mean including but not limited to.

[0026] The terms used herein have their usual meanings in the field, in the context of the present application, and in the specific context, unless otherwise specifically noted. Some terms used to describe the present application are discussed below or elsewhere in the specification to provide additional guidance to those skilled in the art in understanding the description of the present application.

[0027] As to "front", "back", "upper", "lower", "left", "right" and the like used herein, they are directional words, which are used herein only to describe the positional relationship between structures, and are not intended to limit the specific direction of the protection scheme and actual implementation.

[0028] The working principle and advantages of the utility model are as follows: in the locking stage, the second matching part is in any one big end to limit the first matching part to move along the up-down direction (i.e. the length extension direction of the sliding groove), and the connecting piece is matched with the first matching surface to limit the first matching part to move outward (i.e. the length extension direction of the through hole), so as to realize the locking of the guardrail assembly; in the unlocking stage, the connecting piece is matched with the second matching surface (it is required to rotate the connecting piece first), and the second matching part is separated from any one big end, at this time, the first matching part can be freely inserted into any one big end and any part of the sliding groove, so that the position of the mounting seat and the guardrail assembly can be adjusted. Through the above setting, the guardrail assembly can be quickly locked and unlocked through simple structure, and through the above safety mechanism setting, the locking assembly is prevented from being switched from the locking state to the unlocking state, thereby reducing the safety risk. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structure schematic view of a use state of the utility model embodiment platform ladder;

[0030] Figure 2 It is a structure schematic view of another use state of the utility model embodiment platform ladder;

[0031] Figure 3 It is Figure 2 Enlarged view of A in the middle;

[0032] Figure 4 It is an explosion view of the utility model embodiment locking assembly;

[0033] Figure 5 It is a partial structure schematic view of the utility model embodiment platform ladder main body;

[0034] Figure 6 It is Figure 5 Enlarged view of B in the middle.

[0035] In the above drawings: 1, platform ladder main body; 11, sliding groove; 12, big end; 2, guardrail assembly; 3, mounting seat; 31, through hole; 32, clamping groove; 4, sliding rod; 41, first matching part; 411, perforation; 42, second matching part; 5, guide piece; 6, connecting piece; 7, handle; 8, mounting piece; 9, elastic element. DETAILED DESCRIPTION

[0036] The utility model will be further described in combination with the drawings and embodiments:

[0037] Embodiment: The following will be clearly explained in the drawings and detailed description of the present case, any person skilled in the art after understanding the embodiment of the present case, when the technology taught by the present case, can be changed and modified, without departing from the spirit and scope of the present case.

[0038] The terms used herein are only for describing specific embodiments, and are not intended to limit the present case. The singular form, such as "a", "this", "this", "this", and "this", as used herein, also includes the plural form.

[0039] Referring to Figures 1-6 A locking assembly for a platform ladder, the platform ladder comprising a platform ladder body 1 and a guardrail assembly 2, the platform ladder body 1 is provided with a sliding groove 11, both ends of the sliding groove 11 are expanded into a large end 12; characterized in that:

[0040] The locking assembly comprises a mounting seat 3, a sliding rod 4, a connecting piece 6 and an elastic element 9;

[0041] The mounting seat 3 is used as a mechanism for connecting with the guardrail assembly 2; the mounting seat 3 is provided with a through hole 31 for the sliding rod 4 to pass through, one end of the through hole 31 is connected with the sliding groove 11;

[0042] The first end of the sliding rod 4 passes through the through hole 31 of the mounting seat 3 and the sliding groove 11 and is positioned and connected with the connecting piece 6, the connecting piece 6 protrudes in the radial direction of the sliding rod 4; the end surface of the mounting seat 3 towards the connecting piece 6 is provided with an abutting surface matched with the connecting piece 6, and at least two abutting surfaces are distributed around the axis of the sliding rod 4: the first abutting surface and the second abutting surface; the first abutting surface is closer to the first end side of the sliding rod 4 than the second abutting surface; and the first abutting surface 41 and the second abutting surface 42 are arranged in the length direction of the sliding rod 4, and the first abutting surface 41 is closer to the first end of the sliding rod 4 than the second abutting surface 42, the size of the first abutting surface 41 is smaller than the width of the middle part of the sliding groove 11, and the size of the second abutting surface 42 is larger than the width of the middle part of the sliding groove 11 and smaller than the size of the large end 12; the tail end of the sliding rod 4 is used as an operating end;

[0043] The elastic element 9 acts on the sliding rod 4, so that the sliding rod 4 has a tendency to exit the through hole 31 of the mounting seat 3, so that the connecting piece 6 and the abutting surface are kept in abutment;

[0044] Therefore, the locking assembly is configured to have a locked state and an unlocked state; in the locked state, the connecting piece 6 is matched with the first matching surface, so that the second matching part 42 is in any one of the large end 12, thereby limiting the movement of the entire locking assembly and the guardrail assembly 2 along the length direction of the sliding groove 11; in the unlocked state, the connecting piece 6 is matched with the second matching surface, so that the second matching part 42 exits the large end 12, and the first matching part 41 is matched with it, so that the entire locking assembly and the guardrail assembly 2 can move along the length direction of the sliding groove 11; the locking state and the unlocking state of the locking assembly are switched by rotating the operating end of the sliding rod 4.

[0045] In the platform ladder, the guardrail assembly 2 is arranged on the platform ladder body 1, and when the platform ladder is folded, the guardrail assembly 2 needs to be moved to avoid protruding along the length direction of the platform ladder, and the locking assembly is used to lock the guardrail assembly 2 before and after moving the guardrail assembly 2.

[0046] The mounting seat 3 is mounted on the guardrail assembly 2, and here the up-down direction and the inside-outside direction are described for easy understanding; in the locking stage, the second matching part 42 is in any one of the large end 12 to limit the movement of the first matching part 41 along the up-down direction (i.e. the length extension direction of the sliding groove 11), and the connecting piece 6 is matched with the first matching surface to limit the movement of the first matching part 41 to the outside (i.e. the length extension direction of the through hole 31), thereby realizing the locking of the guardrail assembly 2; in the unlocking stage, the connecting piece 6 is matched with the second matching surface (the connecting piece 6 needs to be rotated first), and the second matching part 42 is separated from any one of the large end 12, at this time, the first matching part 41 can be freely inserted into any one of the large end 12 and any part of the sliding groove 11, so that the position of the mounting seat 3 and the guardrail assembly 2 can be adjusted.

[0047] It should be noted that the premise of moving the guardrail assembly 2 is that the mounting seat 3 can move, and the premise of moving the mounting seat 3 is that the first matching part 41 can move along the length extension direction of the sliding groove 11, and the premise of the first matching part 41 moving along the length extension direction of the sliding groove 11 is that the second matching part 42 is separated from any one of the large end 12, and the premise of the second matching part 42 being separated from any one of the large end 12 is that the connecting piece 6 is matched with the second matching surface.

[0048] When locked, the first matching part 41 has no freedom of movement in all directions; when unlocked, the connecting piece 6 needs to be rotated first to match with the second matching surface, which is equivalent to setting an insurance mechanism, which is simple in structure and can avoid the locking assembly from being easily switched from the locked state to the unlocked state, thereby reducing the safety risk.

[0049] Through the above setting, the guardrail assembly 2 can be quickly locked and unlocked through a simple structure, and through the setting of the above safety mechanism, the locking assembly is prevented from being easily switched from the locked state to the unlocked state, thereby reducing the safety risk.

[0050] The sliding rod 4 comprises a first fitting part 41 and a second fitting part 42, which will be described in detail.

[0051] Referring to Figure 3 , Figure 4 In the embodiment, the locking assembly further comprises a handle 7 and a mounting member 8; the handle 7 is mounted on the operation end of the sliding rod 4 through the mounting member 8.

[0052] The handle 7 is arranged to pull the first fitting part 41, which provides convenience compared with directly pulling the first fitting part 41, and improves the user experience.

[0053] Optionally, the mounting member 8 comprises a screw and a nut, and the handle 7 and the first fitting part 41 are connected through the screw and the nut, which is a prior art known to those skilled in the art and will not be described here.

[0054] Referring to Figure 3 , Figure 4 In the embodiment, the elastic element 9 is a mechanical compression spring.

[0055] In addition to the above setting, the elastic element 9 can also be set as follows: one end of the elastic element 9 acts on the guide member 5, and the other end acts on the mounting seat 3. Here, the first fitting part 41 is pulled and moved outward, and through the setting of the spring structure, the first fitting part 41 can be automatically returned inward in the subsequent process. Compared with the mode without the elastic element 9, the setting of the elastic element 9 can improve the user experience, and in order to avoid affecting the user experience, for example, a spring structure with a small elastic coefficient can be used to ensure that the first fitting part 41 can be automatically returned inward while avoiding affecting the rapid pulling of the first fitting part 41 to move outward.

[0056] Optionally, one end of the elastic element 9 abuts against the guide member 5, and the other end abuts against the mounting seat 3, which facilitates the replacement of the elastic element 9.

[0057] In the embodiment, a guide member 5 is further provided.

[0058] The guide member 5 is arranged between the first fitting part 41 and the hole wall of the through hole 31, and provides support for the first fitting part 41 to prevent the first fitting part 41 from being skewed in the through hole 31.

[0059] Referring to Figure 4In the embodiment, the connecting member 6 is a shaft pin fixed to the first end of the sliding rod 4 in the radial direction; the abutting surface is correspondingly matched with the two ends of the shaft pin, and the abutting surface is configured as two symmetrical clamping grooves 32 on a circular surface, that is, as a first matching surface, and the groove bottom of the clamping groove 32 is as a second matching surface.

[0060] The opening of the clamping groove 32 is a trumpet opening.

[0061] By setting the opening of the clamping groove 32 as a trumpet opening (or trumpet shape), the connecting member 6 can be more easily inserted into the clamping groove 32, and the occupied space of the clamping groove 32 does not need to be greatly expanded.

[0062] The circular surface (one side surface of the mounting base 3) is as a first matching surface, and the groove bottom of the clamping groove 32 is as a second matching surface.

[0063] Referring to Figure 4 In the embodiment, the connecting member 6 is a threaded cylindrical pin, and the first matching part 41 is provided with a through hole 411 corresponding to the threaded cylindrical pin.

[0064] The threaded cylindrical pin is a prior art known to those skilled in the art, and will not be described here.

[0065] Referring to Figure 4 In the embodiment, the middle part of the sliding groove 11 is a square groove, and the large end 12 is a circular hole; the first matching part 41 and the second matching part 42 are both cylindrical structures.

[0066] The square groove and the circular hole are conventional settings, and the difficulty of opening is low. Accordingly, the first matching part 41 and the second matching part 42 are both cylindrical structures.

[0067] Referring to Figures 1-6 The platform ladder further comprises a platform ladder body 1 and a guardrail assembly 2, and the platform ladder body 1 is provided with a sliding groove 11, and both ends of the sliding groove 11 are expanded into large ends 12.

[0068] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A locking assembly for a platform ladder, the platform ladder comprising a platform ladder body (1) and a guardrail assembly (2), the platform ladder body (1) being provided with a sliding groove (11), both ends of the sliding groove (11) being expanded into large end portions (12); characterized in that: the locking assembly comprises a mounting seat (3), a sliding rod (4), a connecting piece (6) and an elastic element (9); the mounting seat (3) is a mechanism for connecting with the guardrail assembly (2); the mounting seat (3) is provided with a through hole (31) for the sliding rod (4) to pass through, one end of the through hole (31) being in communication with the sliding groove (11); the first end of the sliding rod (4) is positioned and connected with the connecting piece (6) after passing through the sliding groove (11) and the through hole (31), the connecting piece (6) protruding in the radial direction of the sliding rod (4); the end surface of the mounting seat (3) facing the connecting piece (6) is provided with an abutting surface matched with the connecting piece (6), the abutting surface being provided with at least two matching surfaces, a first matching surface and a second matching surface, around the axis of the sliding rod (4); the first matching surface is closer to the first end side of the sliding rod (4) than the second matching surface; and the first matching portion (41) and the second matching portion (42) are arranged in the length direction of the sliding rod (4), the first matching portion (41) being closer to the first end of the sliding rod (4) than the second matching portion (42), the size of the first matching portion (41) being smaller than the width of the middle portion of the sliding groove (11), and the size of the second matching portion (42) being larger than the width of the middle portion of the sliding groove (11) and smaller than the size of the large end portion (12); the second end of the sliding rod (4) is an operating end; the elastic element (9) acts on the sliding rod (4), so that the sliding rod (4) has a tendency to exit the through hole (31) rearward, so that the connecting piece (6) abuts against the abutting surface; in this way, the locking assembly is configured to have a locked state and an unlocked state; in the locked state, the connecting piece (6) is matched with the first matching surface, so that the second matching portion (42) is located in any one of the large end portions (12), thereby restricting the movement of the entire locking assembly and the guardrail assembly (2) along the length direction of the sliding groove (11); in the unlocked state, the connecting piece (6) is matched with the second matching surface, so that the second matching portion (42) exits the large end portion (12), and the first matching portion (41) is matched therewith, so that the entire locking assembly and the guardrail assembly (2) can move along the length direction of the sliding groove (11); the locked state and the unlocked state of the locking assembly are switched by rotating the operating end of the sliding rod (4). The locking assembly further comprises a handle (7) and a mounting piece (8); the handle (7) is mounted on the operating end of the sliding rod (4) through the mounting piece (8). The elastic element (9) is a mechanical compression spring. A guide piece (5) is further provided.

2. The lock assembly of claim 1, wherein: ​ 3. The lock assembly of claim 1, wherein: ​ 4. The lock assembly of claim 1, wherein: ​ 5. The locking assembly of any one of claims 1-4, wherein: The connecting piece (6) is a shaft pin fixed to the first end of the sliding rod (4) in the radial direction; the abutting surface is correspondingly matched with the two ends of the shaft pin, and the abutting surface is configured as two symmetrical clamping grooves (32) on a circular surface, the circular surface serving as the first matching surface, and the groove bottom of the clamping groove (32) serving as the second matching surface.

6. The lock assembly of claim 5, wherein: The opening of the clamping groove (32) is provided in the shape of a trumpet.

7. The locking assembly of any one of claims 1-4, wherein: The connecting piece (6) is a threaded cylindrical pin, and the first matching part (41) is provided with a through hole (411) corresponding to the threaded cylindrical pin.

8. The locking assembly of any one of claims 1-4, wherein: The middle part of the sliding groove (11) is provided in the shape of a square groove, and the large end (12) is provided in the shape of a circular hole; the first matching part (41) and the second matching part (42) are both provided in the shape of a cylindrical structure.

9. A platform ladder characterized by: The locking assembly comprises a platform ladder body (1) and a guardrail assembly (2), and the platform ladder body (1) is provided with a sliding groove (11), and the two end parts of the sliding groove (11) are both expanded into large ends (12).

10. The staging ladder of claim 9, wherein: The middle part of the sliding groove (11) is provided in the shape of a square groove, and the large end (12) is provided in the shape of a circular hole.

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