Rotary joint and luminaire

Abstract

The application provides a rotary joint and a lamp, the rotary joint comprising a first shell and a second shell, the first shell being provided with a first shaft body fixedly arranged, the first shaft body connecting the first shell and the second shell along an axial direction, and the second shell being capable of rotating around the first shell and the first shaft body, a rotating member being arranged outside the first shaft body and being capable of rotating around the first shaft body, and a torsional spring connecting the rotating member and the second shell respectively, a first nut and an elastic member being arranged on the first shaft body, the elastic member being arranged between the first nut and the rotating member, the first nut being used for abutting against the elastic member and making the rotating member be pre-tightened by the first shaft body in the axial direction. Compared with the prior art, the application can balance the torsional force of the torsional spring, prevent the torsional spring from unlimited rotation, and enhance the hand feeling during rotation by arranging a fixed-force rotating shaft capable of rotating inside the rotary joint.

Description

Rotating joints and lighting fixtures Technical Field

[0001] This invention relates to a rotating joint and a lamp, belonging to the field of lighting technology. Background Technology

[0002] Existing table lamp joints generally use constant force pivots or variable force pivots. As the lamp arms rotate relative to each other, the self-weight torque changes with the rotation angle and is not a constant value.

[0003] Therefore, when the lamp's hinge requires a large torque, the self-weight torque of the fixed-force hinge changes with the angle. When the self-weight torque is small, a larger external force is needed, which will be directly reflected in a poor feel. However, if a torsion spring is used to generate variable torque, the torque value will increase linearly with the angle. Furthermore, since the rotation angle of the torsion spring is limited, the larger the angle, the more the torsion spring rotates.

[0004] In view of this, it is indeed necessary to propose a rotating joint and a lamp to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a rotating joint and a lamp that can enhance the adjustment feel during rotation.

[0006] To achieve the above objectives, the present invention provides a rotating joint, comprising a first housing and a second housing. The first housing is provided with a fixedly mounted first shaft, which connects the first housing and the second housing in an axial direction. The second housing is rotatable around the first housing and the first shaft. The first shaft is fitted with a rotating member that can rotate around the first shaft and a torsion spring that connects the rotating member and the second housing respectively. The first shaft is fitted with a first nut and an elastic member, which are disposed between the first nut and the rotating member. The first nut is used to abut against the elastic member, thereby subjecting the rotating member to a preload force in the axial direction of the first shaft.

[0007] As a further improvement of the present invention, a first cavity is formed in the first housing, a second cavity is formed in the second housing and communicates with the first cavity, the first shaft has a base that limits and cooperates with the first cavity, and the extension direction of the first shaft is perpendicular to the plane where the base is located.

[0008] As a further improvement of the present invention, the first nut is threadedly connected to the first shaft, the rotating member is disposed between the base and the first nut, and the first nut is used to subject the rotating member to pressure from the base and the first nut respectively.

[0009] As a further improvement of the present invention, a first elastic washer is provided between the base and the rotating member, a second elastic washer is provided between the rotating member and the elastic member, and a third elastic washer is provided between the elastic member and the first nut.

[0010] As a further improvement of the present invention, the rotating member is further provided with a receiving portion recessed toward the base, and the elastic member is located in the receiving portion.

[0011] As a further improvement of the present invention, the elastic element is annular and sleeved on the first shaft body. The elastic element has an outer ring that abuts against the rotating member and an inner ring that abuts against the first nut. The outer ring and the inner ring are located in different planes.

[0012] As a further improvement of the present invention, the first shaft body is further provided with a second shaft body extending toward the second housing in the axial direction. The first shaft body and the second shaft body are coaxially arranged, and the diameter of the second shaft body is smaller than the diameter of the first shaft body.

[0013] As a further improvement of the present invention, the second housing has a mounting wall pivotally connected to the second shaft, the second shaft is disposed through the mounting wall, a friction plate sleeved on the body of the second shaft is provided between the mounting wall and the first shaft, the two sides of the friction plate abut against the first shaft and the mounting wall respectively, and the other end of the mounting wall is provided with a second nut for fixing the second shaft, the second nut being threadedly connected to the second shaft.

[0014] As a further improvement of the present invention, a fourth elastic washer is provided between the friction plate and the first shaft, and a fifth elastic washer is provided between the mounting wall and the second nut.

[0015] As a further improvement of the present invention, a third shaft is provided between the first housing and the second housing, the second housing being rotatable relative to the first housing about the third shaft, the third shaft being disposed inside the first housing and partially extending into the second cavity, and the second cavity being provided with a limiting part located on the inner wall of the second housing and abutting against the third shaft, the limiting part being disposed in the rotation direction of the third shaft.

[0016] As a further improvement of the present invention, the third shaft is arc-shaped and rotates around the first shaft.

[0017] As a further improvement of the present invention, the first housing is provided with a first mounting part on the outside, and the second housing is provided with a second mounting part on the outside. The second housing can rotate relative to the first housing, so that the second mounting part can rotate relative to the first mounting part, and the second mounting part is provided with a through hole for the torsion spring to pass through.

[0018] To achieve the above objectives, the present invention also provides a lamp, including the rotating joint described above.

[0019] The beneficial effects of the present invention are: by setting a rotatable constant force shaft inside the rotating joint, the present invention can balance the torque of the torsion spring, prevent the torsion spring from rotating without restriction, and enhance the feel during rotation. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the structure of the lamp of the present invention.

[0021] Figure 2 is a partial structural schematic diagram of the lamp of the present invention.

[0022] Figure 3 is a schematic diagram of the rotating joint of the present invention.

[0023] Figure 4 is an exploded structural diagram of the rotating joint of the present invention.

[0024] Figure 5 is an exploded structural diagram of the rotating joint of the present invention from another perspective.

[0025] Figure 6 is a cross-sectional schematic diagram of the first and second housings of the rotating joint of the present invention.

[0026] Figure 7 is a schematic cross-sectional view of the rotating joint of the present invention.

[0027] Figure 8 is a cross-sectional schematic diagram of the internal structure of the rotating joint of the present invention.

[0028] Figure 9 is an exploded structural diagram of the rotating joint part of the present invention.

[0029] Figure 10 is a schematic diagram of the torque curve variation of the rotating joint of the present invention.

[0030] Figure label:

[0031] 100 Light fixture, 101 First lamp arm, 102 Second lamp arm, 103 First mounting part, 104 Second mounting part, 1041 Through hole, 105 Third shaft, 106 Limiting part;

[0032] 200 Rotating joint, 1001 First cavity, 2001 Second cavity;

[0033] 10 First housing, 11 First shaft, 111 Base, 112 Second shaft, 113 Second limiting feature, 12 First limiting feature, 13 Rotating component, 14 First nut, 15 Elastic component;

[0034] 20 Second housing, 21 Mounting wall, 22 Friction plate, 23 Second nut;

[0035] 30 Torsion spring; 41 First elastic washer, 42 Second elastic washer, 43 Third elastic washer, 44 Fourth elastic washer, 45 Fifth elastic washer. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0038] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] As shown in Figures 1 to 10, this invention discloses a lamp 100, which includes multiple lamp arms pivotally connected to each other to achieve different angle adjustments. Taking any two lamp arms as an example, a rotating joint 200 is provided between the first lamp arm 101 and the second lamp arm 102. The first lamp arm 101 and the second lamp arm 102 can rotate relative to each other around an axis. Furthermore, the first lamp arm 101 is connected to a lamp head, and the second lamp arm 102 is connected to a base 111. With the second lamp arm 102 stationary, the first lamp arm 101 can drive the lamp head to adjust the illumination angle. For clarity, the following description will use the lamp 100 as an example for detailed explanation.

[0040] As shown in Figures 1 to 3, specifically, the rotating joint 200 includes a first housing 10 and a second housing 20. The first housing 10 has a first mounting part 103 on its outer side, which is used to connect the first lamp arm 101. The second housing 20 has a second mounting part 104 on its outer side, which is used to connect the second lamp arm 102.

[0041] As shown in Figure 3, it should be noted that both the first housing 10 and the second housing 20 are columnar and axially connected to each other. The first housing 10 and the second housing 20 have the same radial diameter, and they are capable of rotating relative to each other in the axial direction. Furthermore, the first mounting portion 103 extends axially from the outer side of the first housing 10 towards the outer side of the second housing 20, and the second mounting portion 104 extends axially from the outer side of the second housing 20 towards the outer side of the first housing 10. That is, when the first housing 10 and the second housing 20 rotate relative to each other, the second mounting portion 104 can rotate relative to the first mounting portion 103. The first mounting portion 103 and the second mounting portion 104 interfere with each other, thereby limiting the relative rotation angle between the first housing 10 and the second housing 20 and preventing unrestricted rotation between them.

[0042] Referring to Figures 4 and 5, in particular, in order to enable the first housing 10 and the second housing 20 to rotate relative to each other, a third shaft 105 is provided between the first housing 10 and the second housing 20. A first cavity 1001 is formed in the first housing 10 and is disposed toward the second housing 20. A second cavity 2001 is formed in the second housing 20 and is disposed toward the first housing 10. The second cavity 2001 communicates with the first cavity 1001 and together form a columnar cavity.

[0043] The third shaft 105 is disposed inside the first housing 10, that is, in the first cavity 1001. Since the first housing 10 is columnar, the third shaft 105 is arc-shaped and fits against the inner side of the first housing 10. The third shaft 105 extends outward from the first cavity 1001. The second cavity 2001 is provided with a limiting part 106 located on the inner wall of the second housing 20. Since the second housing 20 is also columnar, the limiting part 106 is also arc-shaped. However, the limiting part 106 is only disposed inside the second cavity 2001. At the same time, the position of the limiting part 106 does not correspond to that of the third shaft 105. When the first housing 10 and the second housing 20 are assembled together, the third shaft 105 extends into the second cavity 2001, and the second housing 20 can rotate relative to the first housing 10 around the third shaft 105, that is, the third shaft 105 slides relative to the inner wall of the second housing 20. The limiting part 106 is located in the rotation direction of the third shaft 105 and is used to abut against the third shaft 105, thereby limiting the rotation angle of the first housing 10 relative to the second housing 20.

[0044] Of course, in other embodiments of the present invention, the limiting part 106 may also extend into the first cavity 1001 to serve as another part of the third shaft 105, and also function as a shaft.

[0045] Furthermore, in order to enable the first lamp arm 101 to be fixed relative to the second lamp arm 102 during adjustment, that is, the first lamp arm 101 can be suspended at any height, a torsion spring 30 is provided between the first housing 10 and the second housing 20. The two ends of the torsion spring 30 are respectively used to connect the first housing 10 and the second housing 20, so that when the first housing 10 and the second housing 20 rotate relative to each other, the torsion spring 30 generates torque to counteract the weight of the first housing 10, the first lamp arm 101 and the lamp head.

[0046] As shown in Figure 4, the two ends of the torsion spring 30 can be connected to any position in the first housing 10 and the second housing 20. Preferably, the second mounting part 104 is provided with a through hole 1041 through which the torsion spring 30 passes, and one end of the torsion spring 30 can be fixed in the through hole 1041.

[0047] As shown in Figure 6, in addition to preventing the first housing 10 and the second housing 20 from separating, the first housing 10 and the second housing 20 are also provided with a first shaft 11 for connecting the first housing 10 and the second housing 20. The third shaft 105 is rotatable around the first shaft 11. The extending direction of the first shaft 11 is parallel to the axial extending direction of the first housing 10. A base 111 is provided at one end of the first shaft 11 facing the first housing 10. The base 111 is disc-shaped and perpendicular to the extending direction of the first shaft 11. The first housing 10 is provided with a first limiting feature 12 that cooperates with the base 111. The base 111 is partially recessed corresponding to the first limiting feature 12, so that the base 111 can cooperate and be fixed with the first housing 10.

[0048] Preferably, the first shaft 11 has a base 111 that is limited and cooperates with the first cavity 1001. The extension direction of the first shaft 11 is perpendicular to the plane where the base 111 is located. When the first housing 10 rotates, the first housing 10 drives the base 111 to rotate through the first limiting feature 12, and the base 111 drives the first shaft 11 to rotate synchronously.

[0049] The first shaft 11 is further provided with a second shaft 112 extending toward the second housing 20 in the axial direction. The first shaft 11 and the second shaft 112 are coaxially arranged and located on the same straight line, and the diameter of the second shaft 112 is smaller than the diameter of the first shaft 11.

[0050] The second shaft 112 is used to connect to and pivotally connect to the second housing 20. The second housing 20 has a mounting wall 21 pivotally connected to the second shaft 112. The second shaft 112 passes through the mounting wall 21 and has two parts located on both sides of the mounting wall 21. A friction plate 22 is sleeved on the part near the first shaft 11. That is, the friction plate 22 is disposed between the mounting wall 21 and the first shaft 11, and the friction plate 22 is sleeved on the outside of the second shaft 112. One side of the friction plate 22 abuts against the side wall of the first shaft 11, and the other side abuts against the mounting wall 21. Thus, when the first shaft 11 and the second shaft 112 rotate, friction is generated between the friction plate 22 and the side wall of the first shaft 11, and between the friction plate 22 and the mounting wall 21.

[0051] The second shaft 112 has an external thread on its outer periphery located on the mounting wall 21 away from the first shaft 11. Specifically, the end of the second shaft 112 has a second nut 23 for fastening along its axial direction. It should be noted that when the first shaft 11 and the second shaft 112 rotate, the second nut 23 rotates synchronously with the second shaft 112, generating friction with the mounting wall 21.

[0052] Referring to Figures 7 and 8, in a preferred embodiment of the present invention, the torsion spring 30 is sleeved on the outside of the first shaft 11 and the second shaft 112. A rotating member 13 is also provided outside the first shaft 11. The rotating member 13 is sleeved on the outside of the first shaft 11 and can rotate relative to the first shaft 11. A first nut 14 is provided on the side of the rotating member 13 away from the first shaft 11. The first nut 14 is sleeved on the first shaft 11 and threadedly connected to the first shaft 11. The rotating member 13 is disposed between the base 111 and the first nut 14. The first nut 14 is used to fasten the rotating member 13 and subject the rotating member 13 to pressure from the base 111 and the first nut 14 respectively, so that the rotating member 13 can be pre-tightened along the axial direction of the first shaft 11.

[0053] It is understood that when the first shaft 11 rotates, the base 111 rotates accordingly and tends to rotate relative to the rotating member 13. The pressure between the rotating member 13 and the base 111 is converted into static friction force perpendicular to the axial direction of the first shaft 11, so as to drive the rotating member 13 and the first nut 14 to rotate synchronously.

[0054] Specifically, the other end of the torsion spring 30 is connected to the rotating member 13. Thus, when the first housing 10 rotates relative to the second housing 20, the torsion spring 30 undergoes elastic deformation and applies torque to both ends of the torsion spring 30. In order to keep the angle between the first lamp arm 101 and the second lamp arm 102 unchanged, that is, to keep the first housing 10 and the second housing 20 at their current rotation angle, the torque of the torsion spring 30 will act on the rotating member 13.

[0055] It should be noted that there is a maximum static friction force between the rotating component 13 and the base 111, and between the rotating component 13 and the first nut 14. When the torque on the rotating component 13 is less than the maximum static friction force, the rotating component 13 does not rotate relative to the first shaft 11. As the rotation angle of the first housing 10 relative to the second housing 20 increases, the torque of the torsion spring 30 increases accordingly. When the torque is greater than the maximum static friction force of the rotating component 13, the static friction force is converted into sliding friction force. Thus, the rotating component 13 rotates relative to the base 111 and the first nut 14. That is, the rotating component 13 rotates around the first shaft 11, which can reduce the elastic deformation of the torsion spring 30, thereby reducing the torque of the torsion spring 30 until it reaches equilibrium with the maximum static friction force.

[0056] As shown in Figure 10, in summary, as the rotation angle of the first housing 10 and the second housing 20 increases, the torque value of the torsion spring 30 is divided into two stages. In the first stage, the rotating member 13 does not rotate, and the torque of the torsion spring 30 increases with the increase of the rotation angle. In the second stage, the rotating member 13 rotates and is used to balance the torque of the torsion spring 30 to the maximum static friction, so that the torque of the torsion spring 30 is maintained at a set value. Furthermore, this set value can be achieved by adjusting the preload of the first nut 14 on the rotating member 13, that is, adjusting the pressure on the rotating member 13. In this embodiment, this set value is preferably 25 kgf·cm.

[0057] Furthermore, since the first nut 14 may loosen during use, and to facilitate adjustment of the first nut 14, an elastic element 15 is provided between the first nut 14 and the rotating member 13. The elastic element 15 is annular and sleeved on the outside of the first shaft 11. The elastic element 15 has an outer ring that abuts against the rotating member 13 and an inner ring that abuts against the first nut 14. The outer ring and the inner ring are located in different planes.

[0058] The rotating member 13 enables the elastic member 15 to undergo elastic deformation along the axial direction of the first shaft 11. The elastic member 15 is configured to consistently generate a spring force on the rotating member 13, i.e., to generate pressure between the rotating member 13 and the base 111, and between the rotating member 13 and the elastic member 15, so that this pressure can be converted into maximum static friction. Preferably, the rotating member 13 also has a receiving portion recessed toward the base 111, and the elastic member 15 is located in the receiving portion.

[0059] As shown in Figures 7 and 9, in addition to reducing wear and increasing effective friction, a first elastic washer 41 is provided between the base 111 and the rotating member 13; a second elastic washer 42 is provided between the rotating member 13 and the elastic member 15; a third elastic washer 43 is provided between the elastic member 15 and the first nut 14; a fourth elastic washer 44 is provided between the friction plate 22 and the first shaft 11; and a fifth elastic washer 45 is provided between the mounting wall 21 and the second nut 23. The first elastic washer 41, the second elastic washer 42, and the third elastic washer 43 are sleeved on the outside of the first shaft 11, and the fourth elastic washer... The first shaft 11 and the second shaft 112 are sleeved on the outside of the second shaft 112. The first shaft 11 and the second shaft 112 are provided with a flat second limiting feature 113. The first elastic pad 41, the second elastic pad 42, the third elastic pad 43, the fourth elastic pad 44 and the fifth elastic pad 45 are respectively engaged with the second limiting feature 113, so that the first shaft 11 and the second shaft 112 can drive the first elastic pad 41, the second elastic pad 42, the third elastic pad 43, the fourth elastic pad 44 and the fifth elastic pad 45 to rotate synchronously during the rotation of the first shaft 11 and the second shaft 112.

[0060] In summary, by providing a rotatable constant-force shaft inside the rotating joint 200, the present invention can balance the torque of the torsion spring 30, prevent the torsion spring 30 from rotating without restriction, and enhance the feel during rotation.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A rotary joint, characterized in that: The device includes a first housing (10) and a second housing (20). The first housing (10) is provided with a fixed first shaft (11). The first shaft (11) connects the first housing (10) and the second housing (20) in the axial direction. The second housing (20) can rotate around the first housing (10) and the first shaft (11). The first shaft (11) is fitted with a rotating member (13) that can rotate around the first shaft (11) and a torsion spring (30) that connects the rotating member (13) and the second housing (20) respectively. The first shaft (11) is fitted with a first nut (14) and an elastic member (15). The elastic member (15) is disposed between the first nut (14) and the rotating member (13). The first nut (14) is used to abut against the elastic member (15) and cause the rotating member (13) to be subjected to a preload force in the axial direction of the first shaft (11).

2. The rotary joint according to claim 1, characterized in that: The first housing (10) has a first cavity (1001) formed therein, and the second housing (20) has a second cavity (2001) that communicates with the first cavity (1001) formed therein. The first shaft (11) has a base (111) that is matched with the first cavity (1001) for limiting. The extending direction of the first shaft (11) is perpendicular to the plane of the base (111).

3. The rotary joint according to claim 2, characterized in that: The first nut (14) is threadedly connected to the first shaft (11), and the rotating member (13) is disposed between the base (111) and the first nut (14). The first nut (14) is used to subject the rotating member (13) to pressure from the base (111) and the first nut (14) respectively.

4. The rotary joint according to claim 2, characterized in that: A first elastic washer (41) is provided between the base (111) and the rotating member (13), a second elastic washer (42) is provided between the rotating member (13) and the elastic member (15), and a third elastic washer (43) is provided between the elastic member (15) and the first nut (14).

5. The rotary joint according to claim 2, characterized in that: The rotating member (13) is also provided with a receiving portion recessed toward the base (111), and the elastic member (15) is located in the receiving portion.

6. The rotary joint according to claim 1, characterized in that: The elastic element (15) is annular and sleeved outside the first shaft (11). The elastic element (15) has an outer ring that abuts against the rotating element (13) and an inner ring that abuts against the first nut (14). The outer ring and the inner ring are located in different planes.

7. The rotary joint according to claim 1, characterized in that: The first shaft (11) is further provided with a second shaft (112) extending toward the second housing (20) in the axial direction. The first shaft (11) and the second shaft (112) are coaxially arranged, and the diameter of the second shaft (112) is smaller than the diameter of the first shaft (11).

8. The rotary joint according to claim 7, characterized in that: The second housing (20) has a mounting wall (21) pivotally connected to the second shaft (112). The second shaft (112) passes through the mounting wall (21). A friction plate (22) is provided between the mounting wall (21) and the first shaft (11) and sleeved on the second shaft (112). The two sides of the friction plate (22) abut against the first shaft (11) and the mounting wall (21) respectively. The other end of the mounting wall (21) is provided with a second nut (23) for fixing the second shaft (112). The second nut (23) is threadedly connected to the second shaft (112).

9. The rotary joint according to claim 8, characterized in that: A fourth elastic washer (44) is provided between the friction plate (22) and the first shaft (11), and a fifth elastic washer (45) is provided between the mounting wall (21) and the second nut (23).

10. The rotary joint according to claim 2, characterized in that: A third shaft (105) is provided between the first housing (10) and the second housing (20). The second housing (20) is rotatable relative to the first housing (10) about the third shaft (105). The third shaft (105) is disposed inside the first housing (10) and extends partially into the second cavity (2001). The second cavity (2001) is also provided with a limiting part (106) located on the inner wall of the second housing (20) and abutting against the third shaft (105). The limiting part (106) is disposed in the rotation direction of the third shaft (105).

11. The rotary joint according to claim 10, characterized in that: The third shaft (105) is arc-shaped and rotates around the first shaft (11).

12. The rotary joint according to claim 1, characterized in that: The first housing (10) has a first mounting part (103) on its outer side, and the second housing (20) has a second mounting part (104) on its outer side. The second housing (20) can rotate relative to the first housing (10), so that the second mounting part (104) can rotate relative to the first mounting part (103), and the second mounting part (104) has a through hole (1041) through which the torsion spring (30) passes.

13. A lamp, characterized in that: Includes the rotary joint as described in any one of claims 1-12.

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