A rotational constraint structure

Abstract

This utility model relates to the field of rotational structure technology, specifically to a rotational limiting structure. The rotational limiting structure includes a fixed sleeve fixedly installed to the end of a first rod and a sliding sleeve sleeved on a second rod. The sliding sleeve cannot rotate relative to the second rod. The sliding sleeve and the fixed sleeve are rotatably assembled. The relative rotation between the sliding sleeve and the fixed sleeve has two directions of rotation. It also includes a one-way rotation limiting component between the sliding sleeve and the fixed sleeve. The one-way rotation limiting component is in a coupled state. When the one-way rotation limiting component is in the coupled state, it can selectively limit the two directions of rotation individually. The rotational limiting structure can limit the relative rotation of the first rod and the second rod. It can partially limit the rotation, that is, the first rod and the second rod can rotate unidirectionally relative to each other, or it can completely limit the rotation, that is, the first rod and the second rod cannot rotate relative to each other at all. It can also release the restriction on the relative rotation of the first rod and the second rod. The operation is easy and convenient.

Description

Technical Field

[0001] This utility model relates to the field of rotational structure technology, and specifically to a rotational limiting structure. Background Technology

[0002] In many scenarios, rotating pipes or shafts that are rotatably assembled together require a rotation locking mechanism to lock the two rotatably assembled parts together, or to release the lock. For example, a common household telescopic horizontal bar is often assembled from an outer sleeve and an inner tube with internal threads. The overall length can be adjusted by rotating the sleeve and inner tube relative to each other, allowing it to extend and support between two side walls. However, during installation, adjusting the extended length is not only very troublesome, but slippage between the main tube and the adjusting tube is also prone to occur. Therefore, a locking mechanism is needed. Traditional locking mechanisms are not easy and convenient to operate. Utility Model Content

[0003] To address the shortcomings of existing locking structures in terms of ease and convenience of operation, this invention provides a rotation limiting structure.

[0004] The technical solution of this utility model is as follows: This utility model provides a rotation limiting structure for controlling the relative rotation between a coaxial first rod and a second rod. It includes a fixed sleeve fixedly installed to the end of the first rod and a sliding sleeve sleeved on the second rod. The sliding sleeve cannot rotate relative to the second rod. The sliding sleeve and the fixed sleeve are rotatably assembled. The relative rotation between the sliding sleeve and the fixed sleeve has two directions of rotation. It also includes a one-way rotation limiting component between the sliding sleeve and the fixed sleeve. The one-way rotation limiting component is in a coupled state. When the one-way rotation limiting component is in the coupled state, the one-way rotation limiting component can selectively limit the two directions of rotation separately. And / or, a unidirectional rotation limiting component can also simultaneously limit two rotation directions.

[0005] Furthermore, the unidirectional rotation limiting component includes a passive coupling component and a unidirectional movable coupling component. The passive coupling component is fixedly disposed on one side of the sliding sleeve and the fixed sleeve, while the unidirectional movable coupling component is disposed on the other side of the sliding sleeve and the fixed sleeve. A control component is also provided to control whether the unidirectional movable coupling component is engaged. The control component can control whether the unidirectional movable coupling component and the passive coupling component are in a coupled state.

[0006] Furthermore, several unidirectional movable coupling elements are provided, and these unidirectional movable coupling elements are divided into a first group and a second group. When the first group and the second group of unidirectional movable coupling elements are in the coupled state, they respectively restrict two different rotation directions.

[0007] Furthermore, the passive coupling element is a ratchet, the unidirectional moving coupling element is a pawl, and an elastic element corresponding to the pawl is also provided. The elastic element causes the corresponding pawl to apply a force to maintain engagement with the ratchet.

[0008] Furthermore, the ratchet is fixedly installed on the outer ring of the fixed sleeve, the pawl is installed on the inner ring of the sliding sleeve, and the elastic element is a spring, which is set in the inner ring of the sliding sleeve and acts on the corresponding pawl.

[0009] Furthermore, each control component has a drive unit at the position corresponding to the pawl, and each pawl has a cooperating actuating part at the position corresponding to the drive unit. By rotating the control component, the drive unit can abut against the actuating part and rotate the pawl outward at a certain angle. At this time, the pawl, which has rotated outward at a certain angle, maintains a non-engaging state with the ratchet.

[0010] Furthermore, the control member has a first position, a second position, and a third position relative to the sliding sleeve in a circumferential direction. When the control member is in the first position, the first set of pawls remains in a non-engaged state with the ratchet, and the second set of pawls remains in an engaged state with the ratchet under the action of the spring. When the control member is in the second position, both the first and second sets of pawls remain in an engaged state with the ratchet under the action of the spring. When the control member is in the third position, the second set of pawls remains in a non-engaged state with the ratchet, and the first set of pawls remains in an engaged state with the ratchet under the action of the spring.

[0011] Furthermore, the control component has three grooves corresponding to the first, second, and third positions, respectively, and a protrusion is provided on the sliding sleeve. By rotating the control component, one of the three grooves can engage with the protrusion.

[0012] Furthermore, a guide sliding assembly is provided between the sliding sleeve and the second rod.

[0013] Furthermore, the pawl is in the shape of an arc plate, with the pawl's shaft located at one end of the arc plate and parallel to the central axis of the arc surface of the arc plate. The other end of the arc plate is the meshing end of the pawl. The actuating part is located on one side of the pawl's shaft and extends to the other end of the arc plate. When rotating the control component, the driving part can abut against the inner side of the corresponding actuating part, thereby causing the pawl to rotate outward around the axis by a certain angle.

[0014] The beneficial effects achieved by this utility model are as follows: This utility model can restrict the relative rotation of the first rod and the second rod through a rotation restriction structure. It can partially restrict the rotation, that is, the first rod and the second rod can rotate relative to each other in one direction, or it can completely restrict the rotation, that is, the first rod and the second rod cannot rotate relative to each other at all. It can also release the restriction on the relative rotation of the first rod and the second rod, making the operation easy and convenient. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the assembly structure of one embodiment of this utility model; Figure 2 This is a cross-sectional view of a rotation limiting structure according to one embodiment of the present invention; Figure 3 This is a diagram showing the fit between the sliding sleeve and the unidirectional movable coupling component of a rotation limiting structure according to one embodiment of this utility model. Figure 4 This is a diagram showing the fit and relationship of the unidirectional rotation limiting component in one embodiment of this utility model; Figure 5 This is a diagram showing the cooperation relationship between the control component and the unidirectional movable coupling component in one embodiment of this utility model; Figure 6 This is a schematic diagram of the fixing sleeve structure of one embodiment of the present invention; Figure 7 This is a schematic diagram of a unidirectional movable coupling component according to one embodiment of this utility model; Figure 8 yes Figure 1 A magnified view of part A. Detailed Implementation

[0016] To facilitate understanding of this utility model by those skilled in the art, the specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0017] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0019] like Figures 1-8 As shown, this embodiment provides a rotation-restricting structure.

[0020] The rotation limiting structure 3 is used to control the relative rotation between the coaxial first rod 1 and the second rod 2. For example, the second rod 2 is installed inside the first rod 1 by a threaded connection. The extension and retraction of the second rod 2 can be achieved by the relative rotation of the two. The rotation limiting structure 3 is set between the end of the first rod 1 and the second rod. The relative rotation of the first rod 1 and the second rod 2 can be limited by the rotation limiting structure. For example, it can be partially limited, that is, the first rod 1 and the second rod 2 can rotate relative to each other in one direction. It can also be completely limited, that is, the first rod 1 and the second rod 2 cannot rotate relative to each other at all. Alternatively, the relative rotation of the first rod 1 and the second rod 2 can be released.

[0021] like Figure 1 As shown, the rotation limiting structure 3 includes a fixed sleeve 31 fixedly installed to the end of the first rod and a sliding sleeve 32 sleeved on the second rod 2. The sliding sleeve 32 cannot rotate relative to the second rod but can slide relative to the second rod along its length. The sliding sleeve 32 and the fixed sleeve 31 are rotatably fitted together. A guide sliding component 4 is provided between the sliding sleeve 32 and the second rod 2. The guide sliding component 4 prevents the sliding sleeve 32 and the second rod 2 from rotating relative to each other, for example, by the cooperation of a guide groove and a guide block. The sliding sleeve 32 can slide along the length of the second rod 2. The rotation limiting structure 3 also includes a one-way rotation limiting component 33 between the sliding sleeve 32 and the fixed sleeve 31, allowing one-way rotation. The limiting component 33 has a coupled state and an uncoupled state. The number of unidirectional rotation limiting components 33 is not limited. Since the relative rotation between the sliding sleeve 32 and the fixed sleeve 31 has two directions of rotation, the coupling state of the unidirectional rotation limiting component 33 can selectively limit the two different directions of rotation individually or simultaneously. That is, the coupling state can be further divided into a first coupling state and a second coupling state, or it can enter an uncoupled state, in which case neither of the two different directions of rotation is limited. A control component 34 can also be set to control whether the unidirectional rotation limiting component 33 is coupled, so as to facilitate selective control of different coupling states.

[0022] like Figure 4As shown, the unidirectional rotation limiting component 33 includes a passive coupling element 331 and a unidirectional movable coupling element 332. The arrangement of the passive coupling element 331 and the unidirectional movable coupling element 332 is not fixed. For example, the passive coupling element 331 can be fixedly arranged on one side of the sliding sleeve 32 and the fixed sleeve 31, while the unidirectional movable coupling element 332 is arranged on the other side. That is, the passive coupling element 331 and the unidirectional movable coupling element 332 can be selectively arranged on different sides of the sliding sleeve 32 and the fixed sleeve 31, respectively. By control, the unidirectional movable coupling element 332 and the passive coupling element 331 can be positioned at different points. In the coupled state, a single unidirectional movable coupling element 332 can only restrict one of the two rotation directions. Therefore, several unidirectional movable coupling elements 332 can be set. One group of unidirectional movable coupling elements 332 and another group restrict two different rotation directions respectively. The coupling of one group of unidirectional movable coupling elements 332 is the first coupling state described above, and the coupling of the other group of unidirectional movable coupling elements 332 is the second coupling state described above. Through this setting, the first coupling state, the second coupling state, and the non-coupling state can be controlled separately, thereby realizing the above-mentioned different rotation direction restriction functions.

[0023] Of course, depending on the actual situation, a unidirectional movable coupling element 332 that restricts the direction of rotation can be selectively set.

[0024] When only one set of unidirectional movable coupling members 332 that restrict the same direction is set, the control is relatively simple. When the unidirectional movable coupling member 332 and the passive coupling member 331 are in a coupled state, the sliding sleeve 32 and the fixed sleeve 31 can only rotate relative to one of the rotation directions. When the unidirectional movable coupling member 332 and the passive coupling member 331 are in a non-coupled state, the rotation restriction of the first rod 1 and the second rod 2 can be completely released.

[0025] like Figure 3 As shown, when two sets of several unidirectional movable coupling members 332 restricting two different rotation directions are simultaneously set, and one unidirectional movable coupling member 332 restricting one direction is in a coupled state while the other unidirectional movable coupling member 332 restricting another direction is in a decoupled state, the sliding sleeve 32 and the fixed sleeve 31 can only rotate relative to each other in one direction; when one unidirectional movable coupling member 332 restricting one direction is in a decoupled state while the other unidirectional movable coupling member 332 restricting another direction is in a coupled state, the sliding sleeve 32 and the fixed sleeve 31 can only rotate relative to each other in the other direction; when both sets of unidirectional movable coupling members 332 restricting rotation directions are in a coupled state, the sliding sleeve 32 and the fixed sleeve 31 cannot rotate relative to each other in any direction, and are in a completely restricted state.

[0026] like Figure 4As shown, in one design, the passive coupling element 331 is a ratchet, and the unidirectional moving coupling element 332 is a pawl. The pawl can be controlled to be in an engaged or disengaged state with the ratchet. The engagement here is one of the coupling methods mentioned above. The ratchet can be fixedly mounted on the outer ring of the fixed sleeve, and the pawl can be mounted on the inner ring of the sliding sleeve. In this case, the control element 34 is set on the sliding sleeve. The control element 34 can control the pawl to be in an engaged state or to remain in a disengaged state. When several pawls restricting two different rotation directions are set at the same time, the pawls restricting one direction are grouped together. The control element 34 can control the pawls in this group to be in an engaged or disengaged state at the same time. It can also control two groups of pawls to be in an engaged state at the same time. It is easier to control the pawls to be in an engaged state at the same time because the pawls usually have corresponding elastic elements 333. When the control element does not interfere with the pawls, the corresponding pawls can always remain in an engaged state under the action of the elastic elements. Therefore, the control element only needs to be able to control the pawls in the same group to be in a disengaged state at the same time to achieve the above function.

[0027] In this embodiment, the ratchet is fixedly installed on the outer ring of the fixed sleeve 31, and the pawl is installed on the inner ring of the sliding sleeve 32. The elastic element 333 is a spring, which is disposed in the inner ring of the sliding sleeve and acts on the corresponding pawl. Under the action of the spring, the pawl can maintain its meshing state with the ratchet. The shaft of the pawl is rotatably connected to the side wall of the sliding sleeve. The control element 34 is annular and rotatably fitted on the end of the sliding sleeve. Figure 5 As shown, each position of the control component 34 corresponding to the pawl is provided with a drive unit 341, such as... Figure 7 As shown, the pawl is provided with a cooperating actuating part 3321 at the position corresponding to the drive part. By rotating the control member, the drive part 341 can abut against the actuating part 3321 and rotate the pawl outward at a certain angle to maintain a non-engaged state with the ratchet. When the control member is reversed, after the drive part and the actuating part are separated, the pawl will maintain an engaged state with the ratchet again under the action of the spring.

[0028] As mentioned above, when two sets of pawls are provided, the control member can only maintain the non-engaged state of one set of pawls at a time. In this case, the control member has three positions relative to the sliding sleeve in a circumferential direction: a first position, a second position, and a third position. When the control member is in the first position, the drive unit abuts against the actuating part of the first set of pawls, maintaining the non-engaged state of the first set of pawls with the ratchet. The second set of pawls maintains engagement with the ratchet under the action of the spring. At this time, the sliding sleeve 32 and the fixed sleeve 31 can only rotate relative to each other in one direction. In the second position, both the drive unit of the control member and the actuating parts of the two sets of pawls are engaged. When kept separate, both sets of pawls remain engaged with the ratchet under the action of the spring, and the sliding sleeve 32 and the fixed sleeve 31 cannot rotate relative to each other in any direction. In the third position, the control unit abuts against the actuating part of the second set of pawls through the driving part, and the second set of pawls remains in a non-engaged state with the ratchet. The first set of ratchet remains engaged with the ratchet under the action of the spring. At this time, the sliding sleeve 32 and the fixed sleeve 31 can only rotate relative to each other in another direction. By rotating the control unit to place it in one of the three positions, the first coupled state, the second coupled state, and the non-coupled state can be controlled separately.

[0029] The pawl is in the shape of an arc plate. The pawl's shaft is located at one end of the arc plate and is parallel to the central axis of the arc surface of the arc plate. The other end of the arc plate is the meshing end of the pawl. The actuating part 3321 is located on one side of the pawl's shaft and extends to the other end of the arc plate. When the control component is rotated, the driving part can abut against the inner side of the corresponding actuating part, thereby causing the pawl to rotate outward around the axis by a certain angle, and then separate from the ratchet.

[0030] like Figure 8 As shown, the control component has three grooves 342 corresponding to the first, second, and third positions, respectively. The sliding sleeve is provided with a protrusion 5. By rotating the control component, one of the three grooves can engage with the protrusion 5. The engagement between the protrusion and the groove can achieve relative stability between the control component and the sliding sleeve. It will not rotate on its own without the action of external force, thus stably maintaining the first coupling state, the second coupling state, or the non-coupling state. The groove is an inwardly concave arc shape, and the protrusion is a convex shape that engages with the arc shape. This shape design can ensure that rotating the control component is easier and more convenient to use.

[0031] The second rod 2 is installed inside the first rod 1 via a threaded connection. A rotation restriction structure 3 is set between the end of the first rod 1 and the second rod. By controlling the first coupled state, the second coupled state, and the non-coupled state respectively, the direction in which the second rod can rotate relative to the first rod can be controlled, or the first rod 1 and the second rod 2 can be completely prevented from rotating relative to each other. This control method can realize the extension and retraction control of the telescopic rod composed of the first rod and the second rod, that is, it can control the telescopic rod to only extend, only shorten, or not extend or retract. When the second rod is installed on both pairs of the first rod, the overall extension can be achieved by rotating the second rod relative to the first rod in one direction. The two ends of the telescopic rod can be opened and abut against the two side walls of a space of fixed width. The telescopic rod is perpendicular to the two side walls. When it is firmly against the wall, the two ends of the telescopic rod and the two side walls in the space generate static friction in the direction perpendicular to the telescopic rod through sufficient pressure. By controlling the coupling state of the rotation restriction structure 3, the reverse rotation of the second rod relative to the first rod in the opposite direction can be restricted, preventing it from reversing and shortening on its own. The installation of the telescopic rod is achieved through static friction, and it can be used as a tool such as a horizontal bar or a clothes drying pole. When it is necessary to reverse the second rod relative to the first rod in the opposite direction to shorten it and remove the installation, it is only necessary to control the coupling state of the rotation restriction structure 3 to not restrict the reverse rotation of the second rod relative to the first rod in the opposite direction. It can also enter the uncoupled state, in which case there is no restriction on the two different rotation directions.

[0032] The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A rotation limiting structure for controlling relative rotation between coaxial first and second shafts (1, 2), characterized by: The rotation limiting structure (3) includes a fixed sleeve (31) fixedly installed to the end of the first rod and a sliding sleeve (32) sleeved on the second rod (2). The sliding sleeve (32) cannot rotate relative to the second rod. The sliding sleeve (32) and the fixed sleeve (31) are rotatably assembled. The relative rotation of the sliding sleeve (32) and the fixed sleeve (31) has two directions of rotation. It also includes a one-way rotation limiting component (33) between the sliding sleeve (32) and the fixed sleeve (31). The one-way rotation limiting component (33) has a coupled state. When the one-way rotation limiting component (33) is in the coupled state, the one-way rotation limiting component (33) can selectively limit the two directions of rotation separately. And / or, the unidirectional rotation limiting component (33) simultaneously limits two rotation directions.

2. A rotation limiting structure according to claim 1, wherein: The one-way rotation limiting component (33) includes a passive coupling component (331) and a one-way movable coupling component (332). The passive coupling component (331) is fixedly disposed on one side of the sliding sleeve (32) and the fixed sleeve (31), while the one-way movable coupling component (332) is disposed on the other side of the sliding sleeve (32) and the fixed sleeve (31). A control component (34) is also provided to control whether the one-way movable coupling component (332) and the passive coupling component (331) are coupled. The control component (34) can control whether the one-way movable coupling component (332) and the passive coupling component (331) are in a coupled state.

3. A rotation limiting structure according to claim 2, wherein: A number of unidirectional movable coupling elements (332) are provided. The unidirectional movable coupling elements (332) among the several are divided into a first group and a second group. When the first group and the second group of unidirectional movable coupling elements (332) are in the coupling state, they restrict two different rotation directions respectively.

4. A rotation limiting structure according to claim 2, wherein: The passive coupling element (331) is a ratchet, the one-way movable coupling element (332) is a pawl, and an elastic element (333) corresponding to the pawl is also provided. The elastic element causes the corresponding pawl to apply a force to maintain engagement with the ratchet.

5. A rotation limiting structure according to claim 4, wherein: The ratchet is fixedly installed on the outer ring of the fixed sleeve (31), the pawl is installed on the inner ring of the sliding sleeve (32), and the elastic element (333) is a spring. The spring is set in the inner ring of the sliding sleeve and acts on the corresponding pawl.

6. A rotation limiting structure according to claim 5, wherein: The control component (34) is provided with a drive part (341) at the position corresponding to the pawl, and the pawl is provided with a cooperating actuating part (3321) at the position corresponding to the drive part. By rotating the control component, the drive part (341) can abut against the actuating part (3321) and make the pawl rotate outward at a certain angle. At this time, the pawl that rotates outward at a certain angle maintains a non-engaged state with the ratchet.

7. A rotation limiting structure according to any one of claims 4 to 6, wherein: The control component has a first position, a second position, and a third position relative to the sliding sleeve in a circumferential direction. When the control component is in the first position, the first set of pawls maintains a non-engaged state with the ratchet, and the second set of pawls maintains an engaged state with the ratchet under the action of the spring. When the control element is in the second position, both the first and second groups of pawls maintain engagement with the ratchet under the action of the spring; When the control element is in the third position, the second set of pawls remains in a non-engaged state with the ratchet, while the first set of ratchets remains engaged with the ratchet under the action of the spring.

8. A rotation limiting structure according to claim 7, wherein: Three recesses (342) corresponding to the first position, the second position and the third position are formed on the control member, and a protrusion (5) is arranged on the sliding sleeve, one of the three recesses can be matched with the protrusion (5) through rotating the control member.

9. A rotation limiting structure according to claim 1, wherein: A guiding sliding assembly (4) is arranged between the sliding sleeve (32) and the second rod (2).

10. A rotation limiting structure according to claim 6, wherein: The pawl is in the shape of an arc plate, the shaft of the pawl is arranged at one end of the arc plate and is parallel to the central shaft of the arc surface of the arc plate, the other end of the arc plate is the engaging end of the pawl, the driving part (3321) is arranged on one side of the shaft of the pawl and extends to the other end of the arc plate, when the rotating control member, the driving part can abut against the inner side of the corresponding driving part so as to make the pawl rotate outward around the shaft by a certain angle.

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