A joint and a ladder using the joint

Abstract

The present invention provides a joint and a ladder using the joint, which belongs to the technical field of ladders and solves the problem of inconvenience in joint unlocking and locking in the prior art. The joint comprises an inner joint, an outer joint is hinged on the inner joint, a movable shaft penetrating the inner joint and the outer joint is provided on the inner joint and the outer joint, a connecting piece is provided at one end of the movable shaft, a locking shaft is provided on the connecting piece, at least one through hole for the locking shaft to pass through is provided circumferentially on the outer joint, at least one locking hole for the locking shaft to pass through is provided circumferentially on the inner joint, the connecting piece can drive the locking shaft to pass into the locking hole to lock the circumferential rotation direction of the inner joint and the outer joint, a first elastic mechanism is also provided between the inner joint and the outer joint to enable the locking shaft to always have a tendency to move into the locking hole, a limit stopper and a second elastic mechanism are provided on the outer side of the locking hole, and the second elastic mechanism enables the limit stopper to always have a tendency to extend out of the passage area of ​​the locking hole.

Description

Technical Field

[0001] The invention belongs to the technical field of ladders, and in particular relates to a joint and a ladder using the joint. Background Art

[0002] Ladders are daily necessities, made up of two long thick poles with a horizontal bar in the middle suitable for climbing. They are used for climbing and can be divided into single-lift ladders and herringbone ladders. Since the overall length of the ladder is relatively fixed, it is necessary to rotate the joints of the ladder to adjust the angle.

[0003] The joint can be a joint part of a ladder, and can also be applied to other fields, such as folding stools, folding chairs, handrails in corridors, etc. Generally speaking, after the joint is rotated to a suitable angle, it needs to be locked. The prior art generally uses a jumping ball shaft and a positioning shaft to lock the rotated joint, but its unlocking and locking operations are relatively unchanged, and the jumping ball shaft, which plays a key role, is difficult to process, time-consuming to assemble, and has high costs, which is not conducive to mass production. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a joint that is easy to unlock and lock and a ladder using the joint.

[0005] The object of the present invention can be achieved through the following technical solutions: a joint, including an inner joint, an outer joint is hinged on the inner joint, a movable shaft running through the inner joint and the outer joint is provided on the inner joint and the outer joint, a connecting piece is provided at one end of the movable shaft, a locking shaft is provided on the connecting piece, at least one through hole for the locking shaft to pass through is provided circumferentially on the outer joint, at least one locking hole for the locking shaft to penetrate is provided circumferentially on the inner joint, the connecting piece can drive the locking shaft to penetrate into the locking hole to lock the circumferential rotation direction of the inner joint and the outer joint, a first elastic mechanism is also provided between the inner joint and the outer joint to enable the locking shaft to always have a tendency to move into the locking hole, a limit stopper and a second elastic mechanism are provided on the outer side of the locking hole, the second elastic mechanism enables the limit stopper to always have a tendency to extend out of the channel area of ​​the locking hole, after the locking shaft leaves the locking hole, the limit stopper can limit the locking shaft from re-penetrating the locking hole, and the circumferential rotation of the locking shaft causes the limit stopper to overcome the action of the second elastic mechanism and shrink inwardly.

[0006] The locking shaft is simultaneously passed through the through hole on the outer joint and the locking hole on the inner joint, and the movable shaft is simultaneously passed through the inner joint and the outer joint, and the two cooperate to lock the inner joint and the outer joint for circumferential rotation. The locking shaft can be pulled out of the locking hole by pulling the connecting piece, and the inner joint and the outer joint can be unlocked and rotated, and the locking shaft can be driven to rotate circumferentially by rotating the connecting piece, and the circumferential rotation of the locking shaft can be pushed toward the second elastic mechanism from the side of the limit block. After the limit block is contracted, the movable shaft is driven to reset by the elastic action of the first elastic mechanism, and the reset of the movable shaft drives the connecting piece and the locking shaft to move, and the locking shaft can be inserted into the locking hole to lock the inner joint and the outer joint again, and the unlocking function can be realized by pulling the connecting piece, and after unlocking, the limit block is extended by the second elastic mechanism to prevent it from automatically locking, and the outer joint and the inner joint can be directly rotated to adjust the required angle, which is simple to operate and has a good locking effect, and each component is easy to process and assemble, which can improve production efficiency.

[0007] In the above-mentioned joint, the limit stopper is provided with a guide structure which can overcome the elastic force of the second elastic mechanism and shrink inward when the side thereof is subjected to pressure. The guide structure can be a guide arc surface or a guide inclined surface.

[0008] In the above-mentioned joint, a mounting seat is provided on the outer side of the locking hole, and a mounting groove for installing a limit block is provided inside the mounting seat. The mounting groove allows the limit block to extend or retract into the locking hole channel area, and a limiting portion is provided on the mounting seat to limit the limit block from detaching from it.

[0009] The mounting groove can provide the limit stopper with movement, and the limit portion can prevent the limit stopper from being driven by the locking shaft to rotate in the circumferential direction or to be separated.

[0010] In the above-mentioned joint, the limit stop block includes a locking portion that can extend or retract into the locking hole channel area and an anti-detachment portion that can prevent separation from the mounting seat. The guide structure is arranged on the locking portion, and the anti-detachment portion can be against the limit portion after the locking portion is extended.

[0011] The locking part extends to prevent the locking shaft from being inserted into the locking hole, and limits the axial position of the locking shaft. After the locking part is retracted, the locking shaft can be inserted into the locking hole to limit the circumferential rotation of the inner joint and the outer joint. The anti-detachment part is used to cooperate with the limiting part to prevent it from being separated from the mounting seat after being acted upon by the elastic force of the second elastic mechanism.

[0012] In the above-mentioned joint, the second elastic mechanism comprises a second spring arranged in the mounting groove, one end of the second spring abuts against the inner wall of the mounting seat, and the other end of the second spring abuts against the limit stopper.

[0013] In actual application, a mounting column can be set in the mounting groove to install the second spring to prevent the second spring from detaching, or the two ends of the second spring can be directly fixedly connected to the inner wall of the mounting seat and the limit block respectively. The former is easy to disassemble and replace and prolongs the service life, while the latter is more firm and has higher stability.

[0014] In the above-mentioned joint, the movable shaft is provided with a step, the outer joint is provided with a fixed ring, the first elastic mechanism comprises a first spring provided on the movable shaft, one end of the first spring abuts against the fixed ring, and the other end abuts against the step, and the first spring can make the movable shaft always have a tendency to drive the locking shaft to move in the locking hole. The step is provided to achieve the interaction between the first spring and the movable shaft.

[0015] In the above-mentioned joint, the outer joint is provided with two through holes, and the inner joint is provided with four locking holes. When the locking shaft passes through the through holes on the outer joint and the locking holes on the inner joint at the same time, the inner joint and the outer joint can be locked in circumferential rotation.

[0016] More locking holes are arranged on the inner joint relative to the outer joint along the circumferential rotation path of the locking shaft. Different locking angles can be adjusted by rotating the locking shaft, and the ladder can be placed in various shapes, such as closed, A-shaped or straight.

[0017] In the above-mentioned joint, there are two locking shafts which are symmetrically arranged with the movable shaft as the center. By arranging two locking shafts which are symmetrical with the movable shaft as the center, the stability of the joint in the locked state can be improved.

[0018] In the above-mentioned joint, a limiting structure capable of limiting the axial movement and separation of the movable shaft from the external joint is provided on the side of the movable shaft away from the connecting piece.

[0019] The limiting structure can be a limiting block, a limiting disk or a limiting rod, and the limiting condition can be met as long as its outer diameter is larger than the inner diameter of the cavity where the movable shaft is located.

[0020] In the above-mentioned joint, a handle is provided on the end of the movable shaft away from the connecting piece for facilitating the movement of the movable shaft in a direction close to the connecting piece.

[0021] The handle facilitates pushing the movable axis to move in a direction close to the connecting piece, and the movement of the connecting piece can drive the locking axis to move, thereby realizing rapid adjustment of both sides of the external joint.

[0022] Another object of the present invention is to provide a ladder using the joint.

[0023] Compared with the prior art, the present invention utilizes a locking shaft and a movable shaft to simultaneously pass through the inner joint and the outer joint to rotationally lock the inner joint and the outer joint, utilizes the elastic action of the first elastic mechanism to drive the movable shaft to reset, and the reset of the movable shaft drives the connecting piece and the locking shaft to move, and the locking shaft can be inserted into the locking hole to lock the inner joint and the outer joint again, and the unlocking function can be achieved by simply pulling the connecting piece, and after unlocking, the limit block is extended by the second elastic mechanism to prevent it from automatically locking, and the outer joint and the inner joint can be directly rotated to adjust the required angle, which is simple to operate and has a good locking effect, and each component is easy to process and assemble, which can improve production efficiency; a guide structure is provided on the limit block to facilitate the locking shaft to push it into the installation groove; a limit portion and an anti-detachment portion are provided to cooperate to prevent the limit block from detaching from the installation groove; and a plurality of locking holes are provided on the inner joint to meet the requirements of multiple angle adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention after hiding part of the structure;

[0027] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure after hiding some of the structures;

[0028] Figure 5 It is a partial structural schematic diagram of the present invention;

[0029] Figure 6 yes Figure 5 Schematic diagram after hiding part of the structure;

[0030] In the figure, 1, inner joint; 2, outer joint; 21, fixing ring; 3, movable shaft; 31, step; 4, connecting piece; 5, locking shaft; 6, locking hole; 7, first spring; 8, limit block; 81, locking part; 82, anti-slip part; 9, second spring; 10, guide structure; 11, mounting seat; 111, limit part; 12, mounting groove; 13, limit structure; 14, handle; 15, through hole. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0032] like Figure 1-6As shown, the present invention comprises an inner joint 1, an outer joint 2 is hinged on the inner joint 1, a movable shaft 3 penetrating the inner joint 1 and the outer joint 2 is provided with a connecting piece 4 at one end of the movable shaft 3, a locking shaft 5 is provided on the connecting piece 4, at least one through hole 15 is provided circumferentially on the outer joint 2 for the locking shaft 5 to pass through, at least one locking hole 6 is provided circumferentially on the inner joint 1 for the locking shaft 5 to penetrate, and the connecting piece 4 can drive the locking shaft 5 to penetrate into the locking hole 6 to rotate the inner joint 1 and the outer joint 2 circumferentially The moving direction is locked, and a first elastic mechanism is provided between the inner joint 1 and the outer joint 2, which can make the locking shaft 5 always have a tendency to move into the locking hole 6. A limit stopper 8 and a second elastic mechanism are provided on the outer side of the locking hole 6. The second elastic mechanism makes the limit stopper 8 always have a tendency to extend out of the channel area of ​​the locking hole 6. After the locking shaft 5 leaves the locking hole 6, the limit stopper 8 can limit the locking shaft 5 from re-entering the locking hole 6. The locking shaft 5 rotates circumferentially to make the limit stopper 8 overcome the action of the second elastic mechanism and shrink inwardly.

[0033] The locking shaft 5 is simultaneously passed through the through hole 15 on the outer joint 2 and the locking hole 6 on the inner joint 1, and the movable shaft is simultaneously passed through the inner joint and the outer joint, and the two cooperate to lock the inner joint 1 and the outer joint 2 in a circumferential rotation. The locking shaft 5 can be pulled out of the locking hole 6 by pulling the connecting piece 4, and the inner joint 1 and the outer joint 2 can be unlocked and rotated, and the rotating connecting piece 4 can drive the locking shaft 5 to rotate in a circumferential direction, and the circumferential rotation of the locking shaft 5 can push it toward the second elastic mechanism from the side of the limit block 8. After the limit block 8 shrinks, the elastic action of the first elastic mechanism is used to drive the movable shaft 3 to reset, and the reset of the movable shaft 3 drives the connecting piece 4 and the locking shaft 5 to move, and the locking shaft 5 can be inserted into the locking hole 6 to lock the inner joint 1 and the outer joint 2 again, and the unlocking function can be realized by pulling the connecting piece 4, and after unlocking, the limit block 8 is extended by the second elastic mechanism to prevent it from automatically locking, and the outer joint 2 and the inner joint 1 can be directly rotated to adjust the required angle, which is simple to operate and has a good locking effect, and each component is easy to process and assemble, which can improve production efficiency.

[0034] The position-limiting stopper 8 is provided with a guide structure 10 which can overcome the elastic force of the second elastic mechanism and shrink inward when the side thereof is subjected to pressure. The guide structure 10 can be a guide camber surface or a guide inclined surface.

[0035] A mounting seat 11 is provided on the outer side of the locking hole 6, and a mounting groove 12 for installing the limit stop block 8 is provided inside the mounting seat 11. The mounting groove 12 allows the limit stop block 8 to extend or retract into the channel area of ​​the locking hole 6, and a limiting portion 111 is provided on the mounting seat 11 to limit the limit stop block 8 from detaching from it.

[0036] The mounting groove 12 can allow the limit stopper 8 to move, and the limit portion 111 can prevent the limit stopper 8 from being driven by the locking shaft 5 to rotate in the circumferential direction or to be separated.

[0037] The limit stop block 8 includes a locking portion 81 that can extend or retract into the channel area of ​​the locking hole 6 and an anti-detachment portion 82 that can prevent separation from the mounting seat 11. The guide structure 10 is arranged on the locking portion 81. After the locking portion 81 is extended, the anti-detachment portion 82 can be against the limiting portion 111.

[0038] The locking portion 81 extends to prevent the locking shaft 5 from being inserted into the locking hole 6, thereby limiting the axial position of the locking shaft 5. After the locking portion 81 is retracted, the locking shaft 5 can be inserted into the locking hole 6 to limit the circumferential rotation of the inner joint 1 and the outer joint 2. The anti-detachment portion 82 is used to cooperate with the limiting portion 111 to prevent it from being separated from the mounting seat 11 after being acted upon by the elastic force of the second elastic mechanism.

[0039] The second elastic mechanism comprises a second spring 9 arranged in the mounting groove 12 , one end of the second spring 9 abuts against the inner wall of the mounting seat 11 , and the other end abuts against the limit stopper 8 .

[0040] In actual application, a mounting column can be set in the mounting groove 12 to install the second spring 9 to prevent the second spring 9 from detaching, or the two ends of the second spring 9 can be directly fixedly connected to the inner wall of the mounting seat 11 and the limit block 8 respectively. The former is easy to disassemble and replace, and extends the service life, while the latter is more firm and has higher stability.

[0041] The movable shaft 3 is provided with a step 31, the external joint 2 is provided with a fixed ring 21, and the first elastic mechanism includes a first spring 7 provided on the movable shaft 3, one end of the first spring 7 abuts against the fixed ring 21, and the other end abuts against the step 31. The first spring 7 can make the movable shaft 3 always have a tendency to drive the locking shaft 5 to move into the locking hole 6. The step 31 is provided to realize that the first spring 7 can interact with the movable shaft 3.

[0042] The outer joint 2 is provided with two through holes 15, and the inner joint 1 is provided with four locking holes 6. When the locking shaft 5 passes through the through holes 15 on the outer joint 2 and the locking holes 6 on the inner joint 1 at the same time, the inner joint 1 and the outer joint 2 can be locked in circumferential rotation. More locking holes 6 are provided on the inner joint 1 along the circumferential rotation path of the locking shaft 5 relative to the outer joint 2, and different locking angles can be adjusted by rotating the locking shaft 5, and the ladder can be placed in a variety of shapes, such as closed, A-shaped, or straight.

[0043] There are two locking shafts 5 and they are symmetrically arranged with the movable shaft 3 as the center. By arranging two locking shafts 5 symmetrically with the movable shaft 3 as the center, the stability of the joint in the locked state can be improved.

[0044] The movable shaft 3 is provided with a limiting structure 13 on one side away from the connecting member 4 to limit the axial movement of the movable shaft 3 and the external joint 2. The limiting structure 13 can be a limiting block, a limiting plate or a limiting rod, and the limiting condition can be met as long as its outer diameter is larger than the inner diameter of the cavity where the movable shaft 3 is located.

[0045] The end of the movable shaft 3 away from the connecting member 4 is provided with a handle 14 for pushing the movable shaft 3 to move toward the connecting member 4. The handle 14 facilitates pushing the movable shaft 3 to move toward the connecting member 4, and the movement of the connecting member 4 can drive the locking shaft 5 to move, so that both sides of the external joint 2 can be quickly adjusted.

[0046] The working principle of the present invention is as follows: the present joint is applied to a ladder or other scenarios, the handle 14 is pushed or the connecting piece 4 is pulled, so that the movable shaft 3 overcomes the elastic force of the first spring 7 and moves toward the side close to the connecting piece 4, the movement of the movable shaft 3 drives the connecting piece 4 to move, and the movement of the connecting piece 4 drives the locking shaft 5 to disengage from the locking hole 6 on the inner joint 1, and the limit stopper 8 extends out of the mounting groove 12 under the action force of the second spring 9, preventing the locking shaft 5 from resetting and inserting back into the locking hole 6 on the inner joint 1. At this time, the inner joint 1 and the outer joint 2 can be rotated. After rotating to a certain angle, the locking shaft 5 presses down the side of a limit stopper 8 and pushes the limit stopper 8 into the mounting groove 12, and the first spring 7 can be reset to drive the movable shaft 3 to reset, and the reset of the movable shaft 3 drives the connecting piece 4 to move, and the movement of the connecting piece 4 drives the locking shaft 5 to insert into the locking hole 6, and locking is achieved again, that is, a single adjustment of the joint angle is completed, and if adjustment is still needed, the handle 14 can be pushed or the connecting piece 4 can be pulled to unlock the inner joint 1 and the outer joint 2.

[0047] The present invention utilizes the locking shaft 5 and the movable shaft 3 to simultaneously pass through the inner joint 1 and the outer joint 2 to rotationally lock the inner joint 1 and the outer joint 2, and utilizes the elastic action of the first elastic mechanism to drive the movable shaft 3 to reset, and the reset of the movable shaft 3 drives the connecting piece 4 and the locking shaft 5 to move, and the locking shaft 5 can be inserted into the locking hole 6 to lock the inner joint 1 and the outer joint 2 again, and the unlocking function can be achieved by pulling the connecting piece 4. After unlocking, the limit stopper 8 is extended by the second elastic mechanism to prevent it from automatically locking, and the outer joint 2 and the inner joint 1 can be directly rotated to adjust the required angle, which is simple to operate and has a good locking effect, and each component is easy to process and assemble, which can improve production efficiency; by arranging a guide structure 10 on the limit stopper 8, it is convenient for the locking shaft 5 to push it into the installation groove 12; by arranging a limit portion 111 and an anti-slip portion 82 to cooperate to prevent the limit stopper 8 from detaching from the installation groove 12; by arranging multiple locking holes 6 on the inner joint 1, a variety of angles can be adjusted.

[0048] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A joint, characterized in that: The invention comprises an inner joint (1), an outer joint (2) is hingedly connected to the inner joint (1), a movable shaft (3) penetrating the inner joint (1) and the outer joint (2), one end of the movable shaft (3) is provided with a connecting piece (4), a locking shaft (5) is provided on the connecting piece (4), at least one through hole (15) is provided circumferentially on the outer joint (2) for the locking shaft (5) to pass through, at least one locking hole (6) is provided circumferentially on the inner joint (1) for the locking shaft (5) to pass through, the connecting piece (4) can drive the locking shaft (5) to pass through the locking hole (6) to lock the circumferential rotation direction of the inner joint (1) and the outer joint (2), and the inner joint (1) and the outer joint (2) are connected to each other. ) is also provided between the locking shaft (5) and the locking hole (6), wherein a first elastic mechanism is provided between the locking shaft (5) and the locking hole (6), wherein a limit stopper (8) and a second elastic mechanism are provided on the outer side of the locking hole (6), wherein the second elastic mechanism enables the limit stopper (8) to always have a tendency to extend out of the channel area of ​​the locking hole (6), wherein after the locking shaft (5) leaves the locking hole (6), the limit stopper (8) can restrict the locking shaft (5) from re-entering the locking hole (6), wherein the locking shaft (5) rotates in a circumferential direction so that the limit stopper (8) overcomes the action of the second elastic mechanism and contracts inwardly; and a guide structure (10) is provided on the limit stopper (8) so that when its side is subjected to pressure, it can overcome the elastic force of the second elastic mechanism and contract inwardly.

2. The joint according to claim 1, characterized in that: A mounting seat (11) is provided on the outer side of the locking hole (6), and a mounting groove (12) for mounting a limit stopper (8) is provided inside the mounting seat (11). The mounting groove (12) allows the limit stopper (8) to extend or retract into the channel area of ​​the locking hole (6), and a limiting portion (111) is provided on the mounting seat (11) for limiting the limit stopper (8) from being separated from the mounting seat (11).

3. The joint according to claim 2, characterized in that: The limit stopper (8) comprises a locking portion (81) that can extend or retract into the channel area of ​​the locking hole (6) and an anti-detachment portion (82) that can prevent separation from the mounting seat (11); the guide structure (10) is arranged on the locking portion (81); after the locking portion (81) is extended, the anti-detachment portion (82) can abut against the limit portion (111).

4. The joint according to claim 2, characterized in that: The second elastic mechanism comprises a second spring (9) arranged in the mounting groove (12), one end of the second spring (9) abuts against the inner wall of the mounting seat (11), and the other end abuts against the limit stopper (8).

5. The joint according to claim 1, characterized in that: The movable shaft (3) is provided with a step (31), the external joint (2) is provided with a fixing ring (21), the first elastic mechanism comprises a first spring (7) arranged on the movable shaft (3), one end of the first spring (7) is against the fixing ring (21), and the other end is against the step (31), and the first spring (7) can make the movable shaft (3) always have the tendency to drive the locking shaft (5) to move into the locking hole (6).

6. The joint according to claim 1, characterized in that: The outer joint (2) is provided with two through holes (15), and the inner joint (1) is provided with four locking holes (6). When the locking shaft (5) passes through the through holes (15) on the outer joint (2) and the locking holes (6) on the inner joint (1) at the same time, the inner joint (1) and the outer joint (2) can be locked in circumferential rotation.

7. The joint according to claim 1, characterized in that: There are two locking shafts (5) which are symmetrically arranged with the movable shaft (3) as the center.

8. The joint according to claim 1, characterized in that: A limiting structure (13) capable of limiting the axial movement and separation of the movable shaft (3) and the external joint (2) is provided on the side of the movable shaft (3) away from the connecting piece (4).

9. The joint according to claim 1, characterized in that: The end of the movable shaft (3) away from the connecting piece (4) is provided with a handle (14) for facilitating the movement of the movable shaft (3) towards the connecting piece (4).

10. A ladder using the joint as claimed in claim 1.

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