A mechanical locking mechanism for a folding joint of a portable ladder

Abstract

The present invention provides a mechanical locking mechanism for a folding joint of a portable ladder. The locking mechanism includes a lower folding body 1 and an upper folding body 14, which are connected by a fourth rotating shaft 21. The folding surface of the lower folding body 1 is provided with a lock buckle mounting groove 22, the upper portion of which is connected to a lock buckle mounting member 3, which is connected to a lock buckle connector 5 via a first rotating shaft 4. The lock buckle connector 5 is connected to a primary lock buckle 10 via a second rotating shaft 7, and the primary lock buckle 10 is connected to a secondary lock buckle 13 via a third rotating shaft 9. The upper folding body 14 is provided with a lock buckle insertion groove 23, the lower portion of which is connected to a lock buckle base 20, which engages with the primary lock buckle 10 and the secondary lock buckle 13 respectively. The present invention adopts a two-stage locking mechanism, which ensures secure locking. The unlocking action is simple and can be completed with a single press. After locking and unlocking, the structure is all internal to the ladder, with no exposed structure.

Description

Technical Field

[0001] The invention relates to a locking mechanism of a portable ladder, in particular to a mechanical locking mechanism for a folding joint of a portable ladder. Background Art

[0002] Ladders are commonly used tools for climbing heights. Foldable ladders are easy to carry and quick to transport. The locking mechanism of the folding joints of common folding ladders generally adopts a pin type. A large space gap is usually reserved between the pin-type locking structure and the folding mechanism for easy locking, which makes the entire folding mechanism structure not compact; it is usually accompanied by abnormal noise when in use, affecting the user experience; the space gap will make the pin hole positioning inaccurate and extend the pinning time, and the pin locking is usually externally mounted, which makes it easy to lose and affects the safety of use. Summary of the Invention

[0003] The purpose of the present invention is to provide a mechanical locking mechanism for the folding joint of a portable ladder to solve the problems of loose structure, abnormal noise, long locking time and safety during folding.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] A mechanical locking mechanism for the folding joint of a portable ladder, the locking mechanism comprising a lower folding body 1 and an upper folding body 14, the lower folding body 1 and the upper folding body 14 being connected by a fourth rotating shaft 21, the folding surface of the lower folding body 1 being provided with a lock mounting groove 22, the upper part of the lock mounting groove 22 being connected to a lock mounting member 3, the lock mounting member 3 being connected to a lock connector 5 via a first rotating shaft 4, the lock connector 5 being connected to a first-level lock 10 via a second rotating shaft 7, the first-level lock 10 being connected to a second-level lock 13 via a third rotating shaft 9, a lock embedding groove 23 being provided on the upper folding body 14, the lower part of the lock embedding groove 23 being connected to a lock base 20, the lock base 20 being engaged with the first-level lock 10 and the second-level lock 13 respectively.

[0006] As a further technical solution, the lock base 20 includes a fixing part 24, a connecting part 25, a first-level clamping part 26, and a second-level clamping part 27. The fixing part 24 is fixed in the lock embedding groove 23. One end of the fixing part 24 is connected to the first-level clamping part 26 through the connecting part 25, and the other end is connected to the second-level clamping part 27. The first-level clamping part 26 is engaged with the first-level lock 10, and the second-level clamping part 27 is engaged with the second-level lock 13.

[0007] As a further technical solution, the first-level lock 10 includes a first-level tongue portion 33, a first-level connecting portion 28, and a first-level releasing portion 29. The middle part of the first-level tongue portion 33 is connected to the lock connector 5 through the second rotating shaft 7, the lower part of the first-level tongue portion 33 is engaged with the first-level clamping portion 26, the upper part of the first-level tongue portion 33 is connected to the second-level lock 13 through the third rotating shaft 9, the right side of the upper part of the first-level tongue portion 33 is connected to the first-level releasing portion 29 through the first-level connecting portion 28, and the left side of the upper part of the first-level tongue portion 33 abuts the right side of the second-level clamping portion 27.

[0008] As a further technical solution, the secondary lock 13 includes a secondary tongue portion 30, a secondary connecting portion 31, and a secondary releasing portion 32. The lower part of the secondary tongue portion 30 is engaged with the secondary clamping portion 27, and the right side of the middle part of the secondary tongue portion 30 is connected to one end of the secondary connecting portion 31. The other end of the secondary connecting portion 31 is connected to the primary lock 10 through the third rotating shaft 9. The left side of the secondary tongue portion 30 abuts the bottom surface of the lock embedding groove 23, and the upper end of the secondary tongue portion 30 is connected to the secondary releasing portion 32.

[0009] As a further technical solution, a third magnet 11 is provided on the surface of the first-level lock buckle 10 close to the second-level lock buckle 13, and a fourth magnet 12 is provided on the surface of the second-level lock buckle 13 close to the first-level lock buckle 10. The third magnet 11 and the fourth magnet 12 repel each other.

[0010] As a further technical solution, a first magnet 2 is provided in the middle of the lock mounting groove 22 , and the first magnet 2 and the third magnet 11 attract each other.

[0011] As a further technical solution, a second magnet 8 is provided on the right side of the middle part of the first-level latch portion 33 , and an iron block 6 is provided on the locking connector 5 .

[0012] As a further technical solution, the locking mechanism includes a release button, which includes a release button mounting base 15, a release button 16, and a release ejector pin 17. The release button mounting base 15 is connected to the upper folding body 14, and the release button 16 is connected to the release button mounting base 15. One end of the release ejector pin 17 is connected to the release button 16, and the other end extends from the bottom of the lock buckle embedding groove 23 and abuts the secondary lock buckle 13.

[0013] As a further technical solution, a fifth magnet 18 is provided on the release button 16 , and a sixth magnet 19 is provided on a side of the upward folding body 14 opposite to the release button 16 . The fifth magnet 18 and the sixth magnet 19 repel each other.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. Two-stage locking is adopted, which ensures firm locking;

[0016] 2. The unlocking action is simple and can be completed with one press;

[0017] 3. After locking and unlocking, the structure is all inside the body, with no exposed structure;

[0018] 4. The locking mechanism has a compact structure and makes no abnormal noise when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 for Figure 1 A-direction sectional view;

[0021] Figure 3 for Figure 1 Exploded view of

[0022] Figure 4 It is a structural diagram of the lock base;

[0023] Figure 5 This is a schematic diagram of the connection structure of the first-level lock, the second-level lock and the lock base.

[0024] Description of reference numerals: 1-folding body, 2-first magnet, 3-locking mounting member, 4-first rotating shaft, 5-locking connection

[0025] Connector, 6-iron block, 7-second rotating shaft, 8-second magnet, 9-third rotating shaft, 10-first-level lock, 11-third magnet, 12-fourth magnet, 13-secondary lock, 14-upward folding body, 15-release button mounting base, 16-release button, 17-release ejector pin, 18-fifth magnet, 19-sixth magnet, 20-lock base, 21-fourth rotating shaft, 22-lock mounting slot, 23-lock embedding slot, 24-fixing part, 25-connecting part, 26-first-level clamping head, 27-secondary clamping head, 28-first-level connecting part, 29-first-level releasing part, 30-secondary tongue part, 31-secondary connecting part, 32-secondary releasing part, 33-first-level tongue part. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example

[0028] This embodiment provides a mechanical locking mechanism for the folding joint of a portable ladder, such as Figures 1 to 5As shown, the locking mechanism includes a lower folding body 1 and an upper folding body 14, and the lower folding body 1 and the upper folding body 14 are connected by a fourth rotating shaft 21. As the lower folding body 1 and the upper folding body 14 rotate around the fourth rotating shaft 21, the retractable and unfolding function of the portable ladder is realized. The structures of the other parts of the lower folding body 1 and the upper folding body 14 not drawn in the figure are the structures that all portable ladders have, and will not be repeated in this embodiment.

[0029] The folding surface of the lower folding body 1 is provided with a lock buckle mounting groove 22, and the upper part of the lock buckle mounting groove 22 is fixedly connected to the lock buckle mounting part 3 by screws. The lock buckle mounting part 3 is T-shaped. The lock buckle connector 5 is U-shaped. The end portion of the lock buckle mounting part 3 is connected to a U-shaped end of the lock buckle connector 5 through the first rotating shaft 4. The other U-shaped end of the lock buckle connector 5 is connected to the first-level lock buckle 10 through the second rotating shaft 7, and the first-level lock buckle 10 is connected to the second-level lock buckle 13 through the third rotating shaft 9. The first rotating shaft 4 and the second rotating shaft 7 are respectively arranged at the two U-shaped ends of the lock buckle connector 5. A lock buckle embedding groove 23 is provided on the upper folding body 14, and the lower part of the lock buckle embedding groove 23 is connected and fixed to the lock buckle base 20, and the lock buckle base 20 is respectively engaged with the first-level lock buckle 10 and the second-level lock buckle 13.

[0030] like Figure 4 As shown, the lock base 20 includes a fixing portion 24, a connecting portion 25, a primary clamping portion 26, and a secondary clamping portion 27. The fixing portion 24 is fixed in the lock insertion groove 23. One end of the fixing portion 24 is connected to the primary clamping portion 26 via the connecting portion 25, and the other end is connected to the secondary clamping portion 27. The primary clamping portion 26 is engaged with the primary lock 10, and the secondary clamping portion 27 is engaged with the secondary lock 13.

[0031] like Figure 5 As shown, the primary lock buckle 10 includes a primary latch portion 33, a primary connecting portion 28, and a primary releasing portion 29. The middle portion of the primary latch portion 33 is connected to the lock buckle connector 5 via the second rotating shaft 7, the lower portion of the primary latch portion 33 is engaged with the primary clamping portion 26, the upper portion of the primary latch portion 33 is connected to the secondary lock buckle 13 via the third rotating shaft 9, the right side of the upper portion of the primary latch portion 33 is connected to the primary releasing portion 29 via the primary connecting portion 28, and the left side of the upper portion of the primary latch portion 33 abuts the right side of the secondary clamping portion 27.

[0032] The secondary lock buckle 13 includes a secondary latch portion 30, a secondary connecting portion 31, and a secondary release portion 32. The lower portion of the secondary latch portion 30 engages with the secondary latch head 27, the right side of the middle portion of the secondary latch portion 30 is connected to one end of the secondary connecting portion 31, and the other end of the secondary connecting portion 31 is connected to the primary lock buckle 10 via the third rotating shaft 9. The left side of the secondary latch portion 30 abuts the bottom surface of the lock buckle embedding groove 23, and the upper end of the secondary latch portion 30 is connected to the secondary release portion 32. The secondary connecting portion 31 is two symmetrically arranged sheet-like structures, each of which is provided with a third rotating shaft 9. A rotating shaft hole is provided on each side of the primary latch portion 33. The two sheet-like structures clamp the primary latch portion 33 from both sides, and the third rotating shaft 9 is inserted into the rotating shaft hole, thereby allowing the secondary lock buckle 13 to rotate around the rotating shaft hole.

[0033] A third magnet 11 is provided on the surface of the primary lock buckle 10 close to the secondary lock buckle 13. A fourth magnet 12 is provided on the surface of the secondary lock buckle 13 close to the primary lock buckle 10, and the third magnet 11 and the fourth magnet 12 repel each other.

[0034] A first magnet 2 is provided in the middle of the lock mounting groove 22 , and the first magnet 2 and the third magnet 11 attract each other.

[0035] A second magnet 8 is provided on the right side of the middle portion of the first-level latch portion 33 , and an iron block 6 is provided on the lock connector 5 . The second magnet 8 and the iron block 6 attract each other.

[0036] The locking mechanism includes a release button, which includes a release button mounting base 15, a release button 16, and a release ejector pin 17. The release button mounting base 15 is connected to the upper folding body 14, the release button 16 is connected to the release button mounting base 15, and one end of the release ejector pin 17 is connected to the release button 16, and the other end extends from the bottom of the lock buckle insertion groove 23 and abuts the secondary lock buckle 13.

[0037] A fifth magnet 18 is provided on the release button 16 , and a sixth magnet 19 is provided on a side of the upward folding body 14 facing the release button 16 . The fifth magnet 18 and the sixth magnet 19 repel each other.

[0038] When the ladder is in use, the upper and lower folding bodies are opened by the folded state around the fourth rotating shaft 21, and the first-level lock buckle 10 is arranged on the lower folding body 1 (realized by the mutual attraction of the third magnet 11 and the first magnet 2) around the first rotating shaft 4 to reach above the upper folding body 14; press the first-level lock buckle 10 lightly, and the first-level lock buckle 10 rotates around the second rotating shaft 7, and the first-level latch portion 33 just cooperates with the first-level clamping head 26 to realize the first-level locking. At this time, the left side of the upper part of the first-level latch portion 33 just abuts the right side of the second-level clamping head 27; the second-level lock buckle 13 drives the second-level lock buckle 13 to rotate around the third rotating shaft 9 by the fourth magnet 12 arranged thereon and the third magnet 11 arranged on the first-level lock buckle 10 The principle of like charges repel each other drives the second-level lock buckle 13 to rotate around the third rotating shaft 9, and the lower part of the second-level latch portion 30 just cooperates with the second-level clamping head 27 to realize the second-level locking. At this time, the left side of the second-level latch portion 30 abuts the bottom surface of the lock buckle embedded groove 23, so just achieve the purpose of folding joint locking.

[0039] When the portable ladder needs to be folded, the release button, which consists of the release button mounting base 15, release button 16, release pin 17, fifth magnet 18, and sixth magnet 19, is lightly pressed. The release pin 17 pushes open the secondary lock 13, and the secondary lock is released, driving the primary lock 10 through the secondary connection portion 31. The primary lock is released, and the iron block 6 and the second magnet 8 attract each other, assisting the primary lock 10 in unlocking. When the primary and secondary locks are fully released, the upper and lower folding bodies fold around the fourth rotation axis 21, and the primary and secondary locks return to their initial state, adsorbed on the first magnet 2 of the lower folding body 1.

[0040] The present invention locks in the folding direction. The lock mechanism is a purely mechanical structure and innovatively adopts the principle of magnet repulsion to assist in locking and unlocking. All locking mechanisms are provided with visual marks when unlocking and locking. At the same time, they can provide sound and tactile changes when unlocking and locking to prevent the occurrence of false locks and the like.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mechanical locking mechanism for a folding joint of a portable ladder, the locking mechanism comprising a lower folding body (1) and an upper folding body (14), the lower folding body (1) and the upper folding body (14) being connected via a fourth rotating shaft (21), characterized in that: The folding surface of the lower folding body (1) is provided with a lock buckle installation groove (22), the upper part of the lock buckle installation groove (22) is connected to the lock buckle installation member (3), the lock buckle installation member (3) is connected to the lock buckle connection member (5) through the first rotating shaft (4), the lock buckle connection member (5) is connected to the first-level lock buckle (10) through the second rotating shaft (7), the first-level lock buckle (10) is connected to the second-level lock buckle (13) through the third rotating shaft (9), and the upper folding body (14) is provided with a lock buckle embedding groove (23), the lower part of the lock buckle embedding groove (23) is connected to the lock buckle base (20), and the lock buckle base (20) is respectively connected to the first-level lock buckle (10) and the second-level lock buckle (13). The lock buckle (10) and the secondary lock buckle (13) are engaged and connected; the lock buckle base (20) includes a fixing portion (24), a connecting portion (25), a primary clamping portion (26), and a secondary clamping portion (27); the fixing portion (24) is fixed in the lock buckle embedding groove (23); one end of the fixing portion (24) is connected to the primary clamping portion (26) through the connecting portion (25), and the other end is connected to the secondary clamping portion (27); the primary clamping portion (26) is engaged and connected to the primary lock buckle (10), and the secondary clamping portion (27) is engaged and connected to the secondary lock buckle (13); the primary lock buckle ( 10) includes a first-level latch portion (33), a first-level connecting portion (28), and a first-level releasing portion (29), wherein the middle portion of the first-level latch portion (33) is connected to the lock connector (5) via a second rotating shaft (7), the lower portion of the first-level latch portion (33) is engaged with the first-level latch head (26), the upper portion of the first-level latch portion (33) is connected to the second-level lock (13) via a third rotating shaft (9), the right side of the upper portion of the first-level latch portion (33) is connected to the first-level releasing portion (29) via the first-level connecting portion (28), and the left side of the upper portion of the first-level latch portion (33) abuts against the second-level latch head (27 ) on the right side; the secondary lock buckle (13) includes a secondary latch portion (30), a secondary connecting portion (31), and a secondary releasing portion (32); the lower portion of the secondary latch portion (30) is engaged with the secondary latch portion (27); the right side of the middle portion of the secondary latch portion (30) is connected to one end of the secondary connecting portion (31); the other end of the secondary connecting portion (31) is connected to the primary lock buckle (10) through a third rotating shaft (9); the left side of the secondary latch portion (30) abuts against the bottom surface of the lock buckle embedding groove (23); and the upper end of the secondary latch portion (30) is connected to the secondary releasing portion (32).

2. A mechanical locking mechanism for a folding joint of a portable ladder according to claim 1, characterized in that: A third magnet (11) is provided on the surface of the primary lock buckle (10) close to the secondary lock buckle (13), and a fourth magnet (12) is provided on the surface of the secondary lock buckle (13) close to the primary lock buckle (10). The third magnet (11) and the fourth magnet (12) repel each other.

3. A mechanical locking mechanism for a folding joint of a portable ladder according to claim 2, characterized in that: A first magnet (2) is provided in the middle of the lock mounting groove (22), and the first magnet (2) and the third magnet (11) attract each other.

4. A mechanical locking mechanism for a folding joint of a portable ladder according to claim 1, characterized in that: A second magnet (8) is provided on the right side of the middle portion of the first-level latch portion (33), and an iron block (6) is provided on the locking connector (5).

5. The mechanical locking mechanism for the folding joint of a portable ladder according to claim 1, characterized in that: The locking mechanism includes a release button, which includes a release button mounting base (15), a release button (16), and a release ejector pin (17). The release button mounting base (15) is connected to the upper folding body (14), the release button (16) is connected to the release button mounting base (15), and one end of the release ejector pin (17) is connected to the release button (16), and the other end extends from the bottom of the lock buckle embedding groove (23) and abuts against the secondary lock buckle (13).

6. A mechanical locking mechanism for a folding joint of a portable ladder according to claim 5, characterized in that: The release button (16) is provided with a fifth magnet (18), and a sixth magnet (19) is provided on a side of the upward folding body (14) opposite to the release button (16), and the fifth magnet (18) and the sixth magnet (19) repel each other.

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