Folding mechanism capable of achieving two-way limiting and study desk

Abstract

The utility model provides a folding mechanism capable of being limited in two directions and a study desk. The folding mechanism capable of being limited in two directions comprises a first supporting frame, a connecting shaft, a second supporting frame, a first one-way bearing, a second one-way bearing, a locking head and a driving assembly. The connecting shaft is arranged on the first supporting frame in a penetrating mode without relative rotation, and the second supporting frame is connected with the connecting shaft. And the locking directions of the second one-way bearing and the first one-way bearing are opposite. And the locking head is respectively matched with the first one-way bearing and the second one-way bearing. The driving assembly is used for driving the connecting shaft to move, so that the locking head is only matched with the first one-way bearing or the second one-way bearing, or the locking head is matched with the first one-way bearing and the second one-way bearing at the same time. According to the folding mechanism capable of achieving bidirectional limiting, even if the included angle between the first supporting frame and the second supporting frame is very small, firm locking can be achieved, so that adjustment of the included angle between the first supporting frame and the second supporting frame is conveniently achieved, the overall structure is simple, and the locking effect is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to learning desk accessory technical field, concretely relates to a folding mechanism of two -way location and learning desk. BACKGROUND

[0002] Learning desk is a new, scientific, human, practical learning auxiliary tool, the height of the table can be according to the needs of the user and according to the need of reading, writing, drawing, handicraft and so on different project to adjust the inclination angle of the table board freely.

[0003] The desk board inclination of prior art generally adopts lockable gas spring to support and lock, and then the desk board inclination is kept in the appropriate position. However, when the inclination angle of the desk board is reduced to 10° and below, the lockable gas spring is easy to fail after bearing the weight of the desk board, so that the desk board cannot be kept in the state of small inclination angle, affecting the use effect. UTILITY MODEL CONTENTS

[0004] In view of the defects in the prior art, the utility model aims at providing a folding mechanism of two-way location and learning desk to improve the locking effect and meet the use demand.

[0005] In order to realize the above-mentioned purpose, the utility model provides a folding mechanism of two-way location, which comprises a first support frame, a connecting shaft, a second support frame, a first one-way bearing, a second one-way bearing, a locking head and a driving assembly.

[0006] Preferably, the driving assembly comprises a guide cylinder and a driving cylinder; the guide cylinder is arranged on the side of the first supporting frame away from the first one-way bearing, the connecting shaft is movably fitted in the guide cylinder and has no relative rotation with the guide cylinder, a strip-shaped hole is arranged on the guide cylinder and extends along the length direction of the connecting shaft; the driving cylinder is sleeved outside the guide cylinder and can rotate around the axis of the connecting shaft, a spiral hole is arranged on the driving cylinder and spirally extends along the axial direction of the driving cylinder; a guide column is arranged on the connecting shaft and sequentially penetrates the strip-shaped hole and the spiral hole.

[0007] Preferably, the driving assembly further comprises a first pull rope and a second pull rope, one end of the first pull rope and the second pull rope is connected with the driving cylinder, and the direction in which the first pull rope drives the driving cylinder to rotate is opposite to the direction in which the second pull rope drives the driving cylinder to rotate.

[0008] Preferably, the driving assembly further comprises an elastic reset member, the elastic reset member is used for applying an elastic force to the connecting shaft to prevent the connecting shaft from being separated from the connection state with the first one-way bearing and the second one-way bearing.

[0009] Preferably, the guide cylinder is provided with a through hole at the end away from the first one-way bearing, the connecting shaft is provided with an extension column at the end away from the locking head, the extension column is shaped to penetrate through the through hole and then protrude out of the guide cylinder, the elastic reset member is sleeved outside the extension column, and the two ends of the elastic reset member are connected with the extension column and the guide cylinder respectively.

[0010] Preferably, the extension column is non-circular in cross section.

[0011] Preferably, the driving cylinder is provided with a limiting flange, the limiting flange is used for preventing the first pull rope and the second pull rope from being separated from the driving cylinder.

[0012] Preferably, a limiting member is arranged outside the guide cylinder, and the limiting member is used for preventing the driving cylinder from moving along the axial direction of the driving cylinder.

[0013] The utility model also provides a learning desk comprising the folding mechanism of two-way limiting.

[0014] The utility model has the advantages of:

[0015] The utility model discloses a kind of folding mechanism of two-way limit, it designs first one-way bearing and second one-way bearing of two locking directions opposite on second support frame, by operating drive assembly to make connecting shaft drive locking head move, make locking head only cooperate with first one-way bearing, or only cooperate with second one-way bearing, or simultaneously cooperate with first one-way bearing and second one-way bearing, it can realize the unlocking and locking of first support frame and second support frame, even if the included angle between first support frame and second support frame is very small, it can be firmly locked, to facilitate the adjustment of the included angle between first support frame and second support frame, overall structure is simple, locking effect is good, convenient to operate.

[0016] The utility model discloses still a kind of study desk, by using the folding mechanism of two-way limit above, even if the inclination angle of desk board is very small, the folding mechanism can overcome the weight of desk board, make desk board stably keep in inclined state, cannot appear failure condition, meet the use demand of user. DRAWINGS

[0017] In order to more clearly illustrate the embodiment of the utility model or the technical scheme in prior art, the drawings needed in the embodiment or prior art description will be simply introduced below.In all drawings, similar elements or parts are generally identified by similar reference signs.The elements or parts in the drawings are not necessarily drawn according to actual proportion.

[0018] Figure 1 The structure schematic view of folding mechanism of two-way limit provided for an embodiment of the utility model;

[0019] Figure 2 The structure schematic view of first support frame;

[0020] Figure 3 The structure schematic view of second support frame;

[0021] Figure 4 The structure schematic view of connecting shaft;

[0022] Figure 5 The structure schematic view of guide cylinder;

[0023] Figure 6 The structure schematic view of drive cylinder;

[0024] Figure 7 The local schematic view of drive assembly and connecting shaft cooperation;

[0025] Figure 8 The structure schematic view of another view of drive assembly and connecting shaft cooperation;

[0026] Figure 9Structure diagram of the first pull rope and the second pull rope cooperating with the driving cylinder;

[0027] Figure 10 Structure diagram of the folding mechanism;

[0028] Reference signs:

[0029] 10, first support frame; 20, connecting shaft; 21, guide column; 22, extension column; 30, second support frame; 40, first one-way bearing; 50, second one-way bearing; 60, locking head; 70, driving assembly; 71, guide cylinder; 711, strip-shaped hole; 712, through hole; 72, driving cylinder; 721, helical hole; 722, limiting flange; 73, first pull rope; 74, second pull rope; 75, elastic reset member; 80, limiting member. DETAILED DESCRIPTION

[0030] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0031] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by the technical personnel in the field to which the present application belongs.

[0032] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, the terms "first", "second", and the like are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] like Figures 1-10 As shown, in one embodiment of this utility model, a bidirectional limiting folding mechanism is provided, including a first support frame 10, a connecting shaft 20, a second support frame 30, a first one-way bearing 40, a second one-way bearing 50, a locking head 60, and a drive assembly 70. The connecting shaft 20 is mounted on the first support frame 10 without relative rotation, and the connecting shaft 20 can move along its own axis on the first support frame 10. The second support frame 30 is connected to the connecting shaft 20 and can rotate around the axis of the connecting shaft 20. The first one-way bearing 40 is fixedly installed on the side of the second support frame 30 opposite to the first support frame 10, and the second one-way bearing 50 is fixedly installed on the side of the first one-way bearing 40 opposite to the second support frame 30. The locking direction of the second one-way bearing 50 is opposite to that of the first one-way bearing 40, and the axes of the second one-way bearing 50, the first one-way bearing 40, and the connecting shaft 20 coincide. Both the first one-way bearing 40 and the second one-way bearing 50 are one-way needle roller bearings, which are existing technology and will not be described in detail in this embodiment.

[0037] The locking head 60 is coaxially fixed to one end of the connecting shaft 20. Both the locking head 60 and the connecting shaft 20 are cylindrical. The locking head 60 mates with the first one-way bearing 40 and the second one-way bearing 50, respectively. The drive assembly 70 is used to drive the connecting shaft 20 to move so that the locking head 60 mates with only the first one-way bearing 40 or the second one-way bearing 50, or simultaneously with both the first one-way bearing 40 and the second one-way bearing 50.

[0038] The folding mechanism is in the initial state, the locking head 60 is clamped in the first one-way bearing 40 and the second one-way bearing 50 (the locking head 60 abuts against the needle rollers in the first one-way bearing 40 and the second one-way bearing 50), because the locking directions of the first one-way bearing 40 and the second one-way bearing 50 are opposite, they will interfere with each other. The connecting shaft 20 is installed on the first support frame 10, and the first one-way bearing 40 and the second one-way bearing 50 are installed on the second support frame 30, therefore, the first support frame 10 and the second support frame 30 cannot rotate, and the first support frame 10 and the second support frame 30 are in a locked state.

[0039] Referring to Figure 10 When it is necessary to adjust the included angle of the first support frame 10 and the second support frame 30, the user operates the driving assembly 70 to move the connecting shaft 20 to the right, and the locking head 60 gradually separates from the second one-way bearing 50, and finally only cooperates with the first one-way bearing 40, thereby completing the unlocking in one direction, at this time, the included angle of the first support frame 10 and the second support frame 30 can be adjusted in this direction. After adjustment, the user operates the driving assembly 70 to move the connecting shaft 20 to the left to reset, and when the locking head 60 cooperates with the first one-way bearing 40 and the second one-way bearing 50 at the same time, the first support frame 10 and the second support frame 30 will be in a locked state again.

[0040] In addition, when it is necessary to adjust the included angle of the first support frame 10 and the second support frame 30, the user can also operate the driving assembly 70 to move the connecting shaft 20 to the left, and the locking head 60 gradually separates from the first one-way bearing 40, and finally only cooperates with the second one-way bearing 50, thereby completing the unlocking in one direction, at this time, the included angle of the first support frame 10 and the second support frame 30 can be adjusted in this direction. After adjustment, the user operates the driving assembly 70 to move the connecting shaft 20 to the right to reset, and when the locking head 60 cooperates with the first one-way bearing 40 and the second one-way bearing 50 at the same time, the first support frame 10 and the second support frame 30 will be in a locked state again.

[0041] The folding mechanism disclosed in the embodiment can limit in two directions, which designs the first one-way bearing 40 and the second one-way bearing 50 with opposite locking directions on the second support frame 30. By operating the driving assembly 70, the connecting shaft 20 drives the locking head 60 to move, so that the locking head 60 cooperates with the first one-way bearing 40 only, or cooperates with the second one-way bearing 50 only, or cooperates with the first one-way bearing 40 and the second one-way bearing 50 simultaneously, so as to realize the unlocking and locking of the first support frame 10 and the second support frame 30. Even if the included angle between the first support frame 10 and the second support frame 30 is small, it can also be firmly locked, so as to facilitate the adjustment of the included angle between the first support frame 10 and the second support frame 30, the overall structure is simple, the locking effect is good, and the operation is convenient.

[0042] In one embodiment, the driving assembly 70 includes a guide cylinder 71 and a driving cylinder 72. The guide cylinder 71 is fixedly installed on the side of the first support frame 10 away from the first one-way bearing 40. The connecting shaft 20 is movably fitted in the guide cylinder 71 and does not rotate relative to the guide cylinder 71. The guide cylinder 71 is provided with a strip-shaped hole 711 extending along the length direction of the connecting shaft 20. The driving cylinder 72 is sleeved outside the guide cylinder 71 and can rotate around the axis of the connecting shaft 20. The driving cylinder 72 is provided with a spiral hole 721 extending spirally along the axial direction of the driving cylinder 72. The connecting shaft 20 is fixedly installed with a guide column 21. The guide column 21 passes through the strip-shaped hole 711 and the spiral hole 721 in sequence.

[0043] By rotating the driving cylinder 72, the spiral hole 721 on the driving cylinder 72 pushes the guide column 21, so that the guide column 21 drives the connecting shaft 20 to move. Since the guide column 21 is simultaneously limited in the spiral hole 721 and the strip-shaped hole 711, the guide column 21 can only move along the strip-shaped hole 711, and the connecting shaft 20 can only move along the axis direction of itself and does not rotate relative to the guide cylinder 71.

[0044] During the movement of the connecting shaft 20, the locking head 60 cooperates with the first one-way bearing 40, or cooperates with the second one-way bearing 50, or cooperates with the first one-way bearing 40 and the second one-way bearing 50 simultaneously, so as to realize the adjustment of the unlocking or locking state of the first support frame 10 and the second support frame 30. The structure design of the driving assembly 70 is ingenious and convenient to operate.

[0045] Further, the driving assembly 70 further comprises a first pull rope 73 and a second pull rope 74, one end of the first pull rope 73 and the second pull rope 74 is connected with the driving cylinder 72, the direction of the first pull rope 73 driving the driving cylinder 72 to rotate is opposite to the direction of the second pull rope 74 driving the driving cylinder 72 to rotate. By designing the first pull rope 73 and the second pull rope 74, it is convenient for the user to operate the driving cylinder 72 to rotate forward or reverse, thereby facilitating the unlocking or locking operation of the first support frame 10 and the second support frame 30.

[0046] In one embodiment, the driving assembly 70 further comprises an elastic reset member 75, the elastic reset member 75 is used to apply elastic force to the connecting shaft 20 to prevent the connecting shaft 20 from being separated from the connection state with the first one-way bearing 40 and the second one-way bearing 50. The end of the guide cylinder 71 away from the first one-way bearing 40 is provided with a through hole 712, the end of the connecting shaft 20 away from the locking head 60 is provided with an extension column 22, the extension column 22 is adapted to pass through the through hole 712 and then protrude out of the guide cylinder 71. The elastic reset member 75 is selected from a spring, the elastic reset member 75 is sleeved outside the extension column 22, and the two ends of the elastic reset member 75 are connected with the extension column 22 and the guide cylinder 71 respectively.

[0047] Under the action of the elastic force of the elastic reset member 75, the locking head 60 can be kept in the connection state with the first one-way bearing 40 and the second one-way bearing 50, that is, the first support frame 10 and the second support frame 30 are kept in the locked state. When the locking head 60 is separated from the first one-way bearing 40 or the second one-way bearing 50, the elastic reset member 75 will apply force to the connecting shaft 20 to reset the locking head 60 and the driving cylinder 72.

[0048] In one embodiment, the cross section of the extension column 22 is non-circular. The cooperation of the extension column 22 and the through hole 712 can not only enable the connecting shaft 20 to move along its own axis on the first support frame 10, but also prevent the connecting shaft 20 from rotating relative to the first support frame 10. That is, the first support frame 10 and the connecting shaft 20 as a whole rotate relative to the second support frame 30, or the second support frame 30 rotates relative to the first support frame 10 and the connecting shaft 20. In this way, not only is the machining convenient, but also the stability of the overall structure is improved.

[0049] In one embodiment, in order to avoid the first pull rope 73 and the second pull rope 74 from being separated from the driving cylinder 72, the driving cylinder 72 is provided with a limiting flange 722, the limiting flange 722 is used to prevent the first pull rope 73 and the second pull rope 74 from being separated from the driving cylinder 72.

[0050] In one embodiment, the guide cylinder 71 is provided with a limiting member 80 outside, the limiting member 80 is used to prevent the driving cylinder 72 from moving in the axial direction relative to the guide cylinder 71, and the limiting member 80 is selected from a snap spring. Under the limitation of the limiting member 80, the driving cylinder 72 can be prevented from moving in the axial direction relative to the guide cylinder 71.

[0051] The embodiment also provides a learning desk using the bidirectional limiting folding mechanism, which comprises a table frame and a table board, the table board is hinged to the table frame, the first supporting frame 10 is hinged to the table frame, and the second supporting frame 30 is hinged to the table board. By using the bidirectional limiting folding mechanism, even if the inclination angle of the table board is small (for example, the inclination angle is 10° or below), the folding mechanism can overcome the weight of the table board, so that the table board is stably kept in the inclined state and does not fail, and the use requirement of the user is met.

[0052] In the description of the utility model, a large number of specific details are explained. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present description.

[0053] Finally, it should be noted that: the above embodiments are only used to illustrate the technical scheme of the utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the utility model, and they should be covered in the scope of the claims and the description of the utility model.

Claims

1. A bidirectional position-limiting folding mechanism, characterized in that, The utility model relates to a support frame (10) for a door leaf (1) of a door (2) of a vehicle (3), comprising: a first support frame (10); a connecting shaft (20) which is arranged without relative rotation in the first support frame (10) and which is movable in the direction of its axis in the first support frame (10); a second support frame (30) which is connected to the connecting shaft (20) and which is rotatable about the axis of the connecting shaft (20); a first one-way bearing (40) which is arranged on the side of the second support frame (30) facing away from the first support frame (10); a second one-way bearing (50) which is arranged on the side of the first one-way bearing (40) facing away from the second support frame (30), the second one-way bearing (50) being arranged in the opposite locking direction to the first one-way bearing (40), the axis of the second one-way bearing (50), the first one-way bearing (40) and the connecting shaft (20) coinciding; a locking head (60) which is arranged on one end of the connecting shaft (20), the locking head (60) cooperating with the first one-way bearing (40) and the second one-way bearing (50), respectively; and a drive assembly (70) for driving the connecting shaft (20) in such a way that the locking head (60) cooperates only with the first one-way bearing (40) or the second one-way bearing (50) or simultaneously with the first one-way bearing (40) and the second one-way bearing (50).

2. The bi-directionally limitable folding mechanism of claim 1, wherein, The drive assembly (70) comprises a guide cylinder (71) and a drive cylinder (72); the guide cylinder (71) is arranged on the side of the first support frame (10) facing away from the first one-way bearing (40), the connecting shaft (20) being arranged movably in the guide cylinder (71) without relative rotation, the guide cylinder (71) being provided with a strip-shaped hole (711) which extends in the length direction of the connecting shaft (20); the drive cylinder (72) is arranged around the guide cylinder (71) and is rotatable about the axis of the connecting shaft (20), the drive cylinder (72) being provided with a helical hole (721) which extends helically in the axial direction of the drive cylinder (72); the connecting shaft (20) is provided with a guide post (21) which passes through the strip-shaped hole (711) and the helical hole (721) in succession.

3. The bi-directionally limitable folding mechanism of claim 2, wherein, The drive assembly (70) further comprises a first pull rope (73) and a second pull rope (74), one end of each of the first pull rope (73) and the second pull rope (74) being connected to the drive cylinder (72), the direction in which the first pull rope (73) drives the drive cylinder (72) to rotate being opposite to the direction in which the second pull rope (74) drives the drive cylinder (72) to rotate.

4. The bi-directionally limitable folding mechanism of claim 2, wherein, The drive assembly (70) further comprises an elastic return element (75) for exerting an elastic force on the connecting shaft (20) in order to prevent the connecting shaft (20) from being separated from the connection state with the first one-way bearing (40) and the second one-way bearing (50).

5. The bi-directionally limitable folding mechanism of claim 4, wherein, An end of the guide cylinder (71) away from the first one-way bearing (40) is provided with a through hole (712), an end of the connecting shaft (20) away from the locking head (60) is provided with an extension column (22), the extension column (22) is adapted to pass through the through hole (712) and then protrude out of the guide cylinder (71); The elastic reset member (75) is sleeved outside the extension column (22), and two ends of the elastic reset member (75) are connected with the extension column (22) and the guide cylinder (71) respectively.

6. The bi-directionally limitable folding mechanism of claim 5, wherein, The extension column (22) is non-circular in cross section.

7. The bi-directionally limitable folding mechanism of claim 3, wherein, The driving cylinder (72) is provided with a limiting flange (722), and the limiting flange (722) is used for preventing the first pull rope (73) and the second pull rope (74) from being separated from the driving cylinder (72).

8. The bi-directionally limitable folding mechanism of claim 2, wherein, The guide cylinder (71) is provided with a limiting member (80) outside, and the limiting member (80) is used for preventing the driving cylinder (72) from moving along the axial direction of the driving cylinder (72).

9. A learning desk, characterized by The folding mechanism capable of being limited in two directions comprises the folding mechanism capable of being limited in two directions according to any one of claims 1-8.

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