A rotating shaft that can be locked and unlocked at any angle within a limited range

Abstract

The present invention discloses a rotating shaft that can be locked and unlocked at any angle within a limited range, comprising a shaft sleeve, a core shaft member rotatably engaged in the shaft sleeve, a pin and an elastic element, wherein the core shaft member comprises a core shaft base and an ear plate extending from the top plane of the core shaft base, the core shaft base is rotatably engaged with the inner wall of the shaft sleeve through the arc outer wall of the base, the top of the ear plate is provided with an arc outer wall of the ear plate for rotatably engaging with the inner wall of the shaft sleeve, the left and right sides of the ear plate are provided with pins, the central axis of the pins is parallel to the central axis of the shaft sleeve, the left and right sides of the top plane of the core shaft base are respectively provided with elastic elements, and the top of the elastic elements is in contact with the pins. The present invention has a simple and ingenious structural design, can realize continuous and reliable locking between the shaft sleeve and the core shaft member within a certain angle range, and is convenient to unlock, has a compact overall structure, and is low in manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of rotating shafts, and particularly to a rotating shaft that can be locked and unlocked at any angle within a limited range. Background Art

[0002] Lockable rotating shafts are mainly applied to components that need to perform rotational motion and also need to reliably stop at a certain rotational angle. Their application scenarios are very extensive, such as the angle adjustment of seat backs in automobiles and high-speed rails, the angle adjustment of table boards, the angle adjustment of monitor brackets, etc.

[0003] Disadvantages and deficiencies of traditional lockable rotating shafts:

[0004] 1. Either it has no locking ability itself and needs to rely on mechanism combinations, such as the self-locking of gas springs, etc., to lock the backrest angle. The structure is complex, the use and maintenance costs are relatively high, and the service life is limited.

[0005] 2. Either the rotating shaft itself has locking ability, but the locking angles are not continuous and can only be locked at specific several interval angles. Many use mechanical meshing methods, and their operation experience is poor. Although the locking reliability is good, it is powerless for scenarios where the locking angle needs to be continuously adjustable.

[0006] 3. Either the rotating shaft transmits the locking torque through extrusion (such as electric control or mechanical control) friction. Although it can be continuously adjustable at this time, the torque transmitted only through extrusion friction has poor reliability. There are many influencing factors for friction, and its output result is not very controllable. At the same time, in order to output a large torque, the friction contact surface must be very large, which is not suitable for most rotating shaft usage scenarios.

[0007] Based on the above three disadvantages of existing products, there is currently no relevant pure mechanical, structurally compact rotating shaft product that can be reliably locked at any position on the market. Summary of the Invention

[0008] The purpose of the present invention is to provide a rotating shaft that can be locked and unlocked at any angle within a limited range, so as to solve the problems raised in the above background art.

[0009] To achieve the above purpose, the present invention provides the following technical solutions:

[0010] A rotating shaft that can be locked and unlocked at any angle within a limited range, comprising a shaft sleeve, a mandrel member rotatably fitted within the shaft sleeve, a pin shaft, and an elastic element. The mandrel member includes a mandrel base body and an ear plate extending from the top plane of the mandrel base body. The mandrel base body is rotatably fitted with the inner wall of the shaft sleeve through the outer arc wall of the base body. The top of the ear plate is provided with an outer arc wall of the ear plate for rotatably fitting with the inner wall of the shaft sleeve. The left and right sides of the ear plate are provided with pin shafts, and the central axis of the pin shaft is parallel to the central axis of the shaft sleeve. Elastic elements are respectively distributed and installed on the left and right sides of the top plane of the mandrel base body, and the top of the elastic element is in contact connection with the pin shaft.

[0011] Preferably, the left and right side walls of the ear plate respectively form a pin shaft movable cavity with the inner wall of the shaft sleeve, and the cross-sectional dimension of the pin shaft movable cavity is gradually reduced from top to bottom.

[0012] Preferably, it further includes an unlocking push block arranged within the shaft sleeve, and the two sides of the lower end face of the unlocking push block are respectively in contact connection with the corresponding pin shafts.

[0013] Preferably, arc-shaped guide grooves for cooperating with and contacting the pin shafts are respectively opened on the two sides of the lower end face of the unlocking push block, and the arc curvature radius of the arc-shaped guide groove is greater than the radius of the pin shaft.

[0014] Preferably, the left and right side walls of the unlocking push block are provided with push block arc side walls corresponding to the inner wall of the shaft sleeve.

[0015] Preferably, an installation through hole for installing a push post is further opened on the upper end face of the unlocking push block, and an arc-shaped movable guide groove for the push post to move is opened on the arc outer wall of the shaft sleeve.

[0016] Preferably, shaft heads extend from the front and rear end faces of the mandrel base body, and the central axis of the shaft head coincides with the central axis of the shaft sleeve.

[0017] Preferably, limiting ring grooves are opened on the inner walls of the front and rear ends of the shaft sleeve.

[0018] Preferably, it further includes a pressing block, and a pressing block insertion post extends from the bottom of the pressing block and is inserted and fixed in the installation through hole.

[0019] Preferably, it further includes a barrel ring, a lever, and a push post movably sleeved outside the shaft sleeve. The push post is movably passed through the barrel ring, the lower end of the push post is inserted into the installation through hole, a group of barrel ring seat plates are extended corresponding to the push post on the outer wall of the barrel ring, a cam extends from the end of the lever, the cam is rotatably installed on the barrel ring seat plate through a central rotating shaft, and the rim of the cam is in contact connection with the top end of the push post.

[0020] Preferably, the bottom of the mandrel base is also set as a plane. Lugs extend from the bottom plane of the mandrel base. Pin shafts are provided on the left and right sides of the lugs at the bottom. Elastic elements are respectively distributed and installed on the left and right sides of the bottom plane of the mandrel base. The bottom of the elastic element is in contact connection with the corresponding pin shaft.

[0021] A set of symmetrical push columns are movably inserted through the barrel ring. A set of barrel ring seat plates symmetrically extend from the outer wall of the barrel ring.

[0022] It further includes an intermediate connecting rod and a bottom lever parallel to the lever. A reverse cam extends from the end of the bottom lever. The reverse cam is rotatably installed on the corresponding barrel ring seat plate through a central rotating shaft. The rim of the reverse cam is in contact connection with the top end of the corresponding push column. The other end of the bottom lever is rotatably connected to the intermediate connecting rod. The other end of the intermediate connecting rod is rotatably connected to the lever. The central axis of the intermediate connecting rod is parallel to that of the push column.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The structure design is simple and ingenious. It can achieve reliable and stable locking at any angle between the shaft sleeve and the mandrel part within a large range of use angles, and the unlocking operation is convenient. The overall structure is compact and the manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 FIG. 15 is a three-dimensional structure schematic diagram of Embodiment 1 of a rotating shaft capable of locking and unlocking at any angle within a limited range;

[0025] Figure 2 FIG. 19 is an end face structure schematic diagram of Embodiment 1 of a rotating shaft capable of locking and unlocking at any angle within a limited range;

[0026] Figure 3 FIG. 23 is a three-dimensional structure schematic diagram of the shaft sleeve in Embodiment 1 of a rotating shaft capable of locking and unlocking at any angle within a limited range;

[0027] Figure 4 FIG. 27 is a three-dimensional structure schematic diagram of the rotating shaft in Embodiment 1 of a rotating shaft capable of locking and unlocking at any angle within a limited range after removing the shaft sleeve;

[0028] Figure 5 FIG. 31 is an exploded structure schematic diagram of the rotating shaft in Embodiment 1 of a rotating shaft capable of locking and unlocking at any angle within a limited range after removing the shaft sleeve;

[0029] Figure 6 FIG. 35 is a structure schematic diagram of the rotating shaft in Embodiment 1 of a rotating shaft capable of locking and unlocking at any angle within a limited range when locked counterclockwise;

[0030] Figure 7 FIG. 39 is a structure schematic diagram of the rotating shaft in Embodiment 1 of a rotating shaft capable of locking and unlocking at any angle within a limited range when locked clockwise;

[0031] Figure 8 It is a three-dimensional structural schematic diagram of a rotating shaft embodiment 2 that can be locked and unlocked at any angle within a limited range;

[0032] Figure 9 It is a schematic diagram of the three-dimensional structure of a rotating shaft embodiment 2 which can be locked and unlocked at any angle within a limited range, after the shaft sleeve is removed;

[0033] Figure 10 It is a three-dimensional structural schematic diagram of a rotating shaft embodiment 3 that can be locked and unlocked at any angle within a limited range;

[0034] Figure 11 It is a schematic diagram of the three-dimensional structure of a rotating shaft embodiment 3 which can be locked and unlocked at any angle within a limited range, after the shaft sleeve is removed;

[0035] Figure 12 It is a three-dimensional structural schematic diagram of a rotating shaft embodiment 4 that can be locked and unlocked at any angle within a limited range;

[0036] Figure 13 It is a schematic diagram of the three-dimensional structure of a rotating shaft embodiment 4 which can be locked and unlocked at any angle within a limited range, after the shaft sleeve is removed.

[0037] In the figure: 1-sleeve, 12-limiting ring groove, 13-arc-shaped movable guide groove, 2-spindle member, 21-spindle base, 22-ear plate, 23-shaft head, 3-pin, 4-elastic element, 5-unlocking push block, 51-arc-shaped guide groove, 52-arc side wall of push block, 53-mounting through hole, 6-pin movable cavity, 7-pressing block, 8-cylinder ring, 81-cylinder ring seat plate, 82-bending rod, 83-cam, 84-bottom bending rod, 85-reverse cam, 86-middle connecting rod, 9-push column. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1: Please refer to Figures 1 to 7, A rotating shaft that can be locked and unlocked at any angle within a limited range, including a shaft sleeve 1, a core shaft member 2 rotatably fitted within the shaft sleeve 1, a pin shaft 3, and an elastic element 4. The core shaft member 2 includes a core shaft base body 21 and an ear plate 22 extending from the top plane of the core shaft base body 21. The core shaft base body 21 is rotatably fitted with the inner wall of the shaft sleeve 1 through the outer wall of the base body arc, and the top of the ear plate 22 is provided with an outer wall of the ear plate arc for rotatably fitting with the inner wall of the shaft sleeve 1. The left and right sides of the ear plate 22 are provided with pin shafts 3, and the central axis of the pin shaft 3 is parallel to the central axis of the shaft sleeve 1. Elastic elements 4 are respectively distributed and installed on the left and right sides of the top plane of the core shaft base body 21, and the top of the elastic element 4 is in contact connection with the pin shaft 3.

[0040] The locking principle of the present invention: The elastic element 4 applies a pre-pressure to the pin shaft 3, and the pre-pressure makes the pin shaft contact the side wall of the ear plate 22 and the inner circular surface of the shaft sleeve simultaneously. In order to achieve two-way self-locking, the number of pin shafts is at least 2.

[0041] As Figure 6 shown, the resultant force generated among the pin shaft 3, the elastic element 4, the shaft sleeve 1, and the core shaft member 2 on the left side causes self-locking between the pin shaft 3 and the shaft sleeve 1, and at the same time, self-locking is also achieved between the pin shaft 3 and the core shaft member 2. In this way, through the mechanical transmission of the pin shaft 3, the core shaft member 2 cannot rotate clockwise relative to the shaft sleeve 1, thereby locking the clockwise rotation;

[0042] As Figure 7 shown, similarly, the pin shaft on the right side locks the counterclockwise rotation of the core shaft member 2 and the shaft sleeve 1. The limitation of the rotation in both directions enables the shaft sleeve 1 and the core shaft member 2 to achieve complete locking.

[0043] Among them, the left and right side walls of the ear plate 22 respectively form a pin shaft activity cavity 6 with the inner wall of the shaft sleeve 1, and the cross-sectional size of the pin shaft activity cavity 6 is gradually reduced from top to bottom.

[0044] As a preferred solution, elastic element installation grooves are provided on the left and right sides of the top plane of the core shaft base body 21, and the elastic element 4 is installed in the elastic element installation grooves. When the elastic element 4 is completely compressed, the pin shaft 3 contacts the top plane of the core shaft base body 21 and the side wall of the ear plate 22 simultaneously, and there is a small activity gap between the pin shaft 3 and the inside of the shaft sleeve 1.

[0045] The present invention further includes an unlocking push block 5 arranged within the shaft sleeve 1, and the lower end surfaces of both sides of the unlocking push block 5 are respectively in contact connection with the corresponding pin shafts 3.

[0046] The unlocking principle of the present invention: When no external force acts on the unlocking push block 5, at this time, the core shaft member 2 is self-locked through the contact between the pin shaft 3 and the shaft sleeve 1, and locking is achieved at this time.

[0047] When an external force pushes the unlocking push block 5 downward, the unlocking push block 5 pushes the pin shaft 3 to move downward, so that the pin shaft 3 and the inner wall of the sleeve 1 are out of contact, thereby releasing the self-locking relationship between the core shaft 2 and the sleeve 1, thereby achieving unlocking. At this time, the rotation of the core shaft 2 relative to the sleeve 1 is not constrained and can move freely.

[0048] Both sides of the lower end surface of the unlocking push block 5 are provided with arc guide grooves 51 for matching with the pin shaft 3, and the arc curvature radius of the arc guide groove 51 is greater than the radius of the pin shaft 3, so that the pin shaft 3 can better match with the unlocking push block 5.

[0049] The left and right side walls of the unlocking push block 5 are provided with push block arc side walls 52 for corresponding to the inner wall of the sleeve 1. The unlocking push block 5 can be better adapted and installed in the sleeve 1.

[0050] The upper end surface of the unlocking push block 5 is also provided with a mounting through hole 53 for mounting the push column 9, and the arc-shaped movable guide groove 13 for the push column 9 to move is provided on the arc outer wall of the shaft sleeve 1. The unlocking push block 5 can be pushed by the push column 9 to achieve unlocking, which is easy to operate and use, and the arc-shaped movable guide groove 13 can provide a movable space for the movement of the push column 9.

[0051] The front and rear end surfaces of the mandrel base 21 are extended with shaft heads 23, and the central axis of the shaft head 23 coincides with the central axis of the sleeve 1. The mandrel member 2 can be connected to an external transmission component through the shaft head 23.

[0052] The inner walls of the front and rear ends of the sleeve 1 are provided with limiting ring grooves 12, and limiting collars, end bearings and other components can be installed in the limiting ring grooves to limit the front and rear ends of the core shaft 2 to prevent the core shaft 2 from falling out of the sleeve 1.

[0053] Example 2: Please refer to Figures 8 to 9 The difference from Embodiment 1 is that this embodiment further includes a pressing block 7 , a pressing block plug post extends from the bottom of the pressing block 7 , and the pressing block plug post is inserted and fixed in the mounting through hole 53 .

[0054] For occasions where the locking force or operating comfort requirements are not very high, such as an angle-adjustable mobile phone holder, the solution of Example 2 can be adopted. There are only two pins inside. The unlocking can be performed by manually pushing the pressing block 7 to overcome the elastic force of the elastic element 4. The structure is simple and the cost is low.

[0055] Example 3: Please refer to Figures 10 to 11, which is different from Embodiment 1 in that this embodiment further includes a barrel ring 8 movably sleeved outside the bushing 1, a lever 82, and a push column 9. The push column 9 is movably inserted through the barrel ring 8, and the lower end of the push column 9 is fixedly inserted into the installation through hole 53. A set of barrel ring seat plates 81 corresponding to the push column 9 extend on the outer wall of the barrel ring 8. A cam 83 extends at the end of the lever 82. The cam 83 is rotatably installed on the barrel ring seat plate 81 through a central rotating shaft, and the rim of the cam 83 is in contact connection with the top end of the push column 9.

[0056] By pushing the lever 82, the cam 83 rotates. The rotating cam 83 will press down the push column 9, and the push column 9 will push the unlocking push block 5 and the pin shaft 3 downward, thereby realizing unlocking. Compared with Embodiment 2, the structure is slightly more complex, but relatively speaking, the operating force is smaller and the use experience is better.

[0057] Embodiment 4: Please refer to Figures 12 to 13 , which is different from Embodiment 3 in that the bottom of the mandrel matrix 21 is also set as a plane, and ear plates 22 also extend from the bottom plane of the mandrel matrix 21. Pin shafts 3 are also provided on both the left and right sides of the bottom ear plates 22. Elastic elements 4 are respectively distributed and installed on both the left and right sides of the bottom plane of the mandrel matrix 21. The bottom of the elastic element 4 is in contact connection with the corresponding pin shaft 3;

[0058] A set of symmetric push columns 9 are movably inserted through the barrel ring 8, and a set of symmetric barrel ring seat plates 81 extend on the outer wall of the barrel ring 8;

[0059] It also includes an intermediate connecting rod 86 and a bottom lever 84 arranged in parallel with the lever 82. A reverse cam 85 extends at the end of the bottom lever 84. The reverse cam 85 is rotatably installed on the corresponding barrel ring seat plate 81 through a central rotating shaft, and the rim of the reverse cam 85 is in contact connection with the top end of the corresponding push column 9. The other end of the bottom lever 84 is rotatably connected to the intermediate connecting rod 86, and the other end of the intermediate connecting rod 86 is rotatably connected to the lever 82. The intermediate connecting rod 86 is parallel to the central axis of the push column 9.

[0060] For occasions with high requirements for locking force or stability, such as the display bracket in medical equipment, or adjustable table boards that need to bear large torques, etc., the technical solution of Embodiment 4 can be adopted. There are 4 pin shafts symmetrically arranged inside, which ensures the locking force and reliability. At the same time, a lever-triggered structure is used. By pushing the lever 82 with one hand, the lever 82 will drive the intermediate connecting rod 86 and the bottom lever 84 at the same time, and unlocking can be carried out. The operation is convenient and it combines performance and ease of use.

[0061] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0062] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotating shaft that can be locked and unlocked at any angle within a limited range, characterized in that: it includes a bushing (1), a mandrel member (2) rotatably fitted in the bushing (1), a pin shaft (3), and an elastic element (4). The mandrel member (2) includes a mandrel base body (21) and an ear plate (22) extending from the top plane of the mandrel base body (21). The mandrel base body (21) is rotatably fitted with the inner wall of the bushing (1) through the outer arc wall of the base body. The top of the ear plate (22) is provided with an outer arc wall of the ear plate for rotatably fitting with the inner wall of the bushing (1). The left and right sides of the ear plate (22) are provided with pin shafts (3). The central axis of the pin shaft (3) is parallel to the central axis of the bushing (1). Elastic elements (4) are respectively distributed and installed on the left and right sides of the top plane of the mandrel base body (21). The top of the elastic element (4) is in contact connection with the pin shaft (3); the left and right side walls of the ear plate (22) respectively form a pin shaft movable cavity (6) with the inner wall of the bushing (1). The cross-sectional dimension of the pin shaft movable cavity (6) is gradually reduced from top to bottom; it further includes an unlocking push block (5) arranged in the bushing (1). The lower end surfaces on both sides of the unlocking push block (5) are respectively in contact connection with the corresponding pin shafts (3); arc-shaped guide grooves (51) for cooperating and contacting with the pin shafts (3) are respectively opened on both sides of the lower end surface of the unlocking push block (5). The arc curvature radius of the arc-shaped guide grooves (51) is greater than the radius of the pin shafts (3); push block arc side walls (52) corresponding to the inner wall of the bushing (1) are arranged on the left and right side walls of the unlocking push block (5).

2. The rotating shaft according to claim 1 that can be locked and unlocked at any angle within a limited range, characterized in that: an installation through hole (53) for installing a push post (9) is further opened on the upper end surface of the unlocking push block (5). An arc-shaped movable guide groove (13) for the push post (9) to move is opened on the arc outer wall of the bushing (1).

3. The rotating shaft according to claim 1 that can be locked and unlocked at any angle within a limited range, characterized in that: shaft heads (23) extend from the front and rear end faces of the mandrel base body (21). The central axis of the shaft heads (23) coincides with the central axis of the bushing (1). Limiting ring grooves (12) are opened on the inner walls at the front and rear ends of the bushing (1).

4. The rotating shaft according to claim 2 that can be locked and unlocked at any angle within a limited range, characterized in that: it further includes a pressing block (7). A pressing block insertion post extends from the bottom of the pressing block (7). The pressing block insertion post is inserted and fixed in the installation through hole (53).

5. The rotating shaft according to claim 2 that can be locked and unlocked at any angle within a limited range, characterized in that: It further includes a barrel ring (8), a lever (82) and a push column (9) movably sleeved outside the bushing (1). The push column (9) is movably inserted through the barrel ring (8), and the lower end of the push column (9) is inserted and fixed in the mounting through hole (53). A set of barrel ring seat plates (81) corresponding to the push column (9) extend on the outer wall of the barrel ring (8). A cam (83) extends at the end of the lever (82), and the cam (83) is rotatably mounted on the barrel ring seat plate (81) through a central rotating shaft, and the rim of the cam (83) is in contact connection with the top end of the push column (9).

6. A rotating shaft that can be locked and unlocked at any angle within a limited range according to claim 5, characterized in that: The bottom of the core shaft base body (21) is also set as a plane, and ear plates (22) extend from the bottom plane of the core shaft base body (21). Pin shafts (3) are provided on the left and right sides of the ear plates (22) at the bottom. Corresponding elastic elements (4) are respectively distributed and installed on the left and right sides of the bottom plane of the core shaft base body (21), and the bottom of the elastic element (4) is in contact connection with the corresponding pin shaft (3); A set of symmetric push columns (9) are movably inserted through the barrel ring (8), and a set of symmetric barrel ring seat plates (81) extend on the outer wall of the barrel ring (8); It further includes an intermediate connecting rod (86) and a bottom lever (84) arranged parallel to the lever (82). A reverse cam (85) extends at the end of the bottom lever (84), and the reverse cam (85) is rotatably mounted on the corresponding barrel ring seat plate (81) through a central rotating shaft, and the rim of the reverse cam (85) is in contact connection with the top end of the corresponding push column (9). The other end of the bottom lever (84) is rotatably connected to the intermediate connecting rod (86), and the other end of the intermediate connecting rod (86) is rotatably connected to the lever (82). The intermediate connecting rod (86) is parallel to the central axis of the push column (9).

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