A lamp arm joint connecting structure and a table lamp using the same

Abstract

The utility model discloses a lamp arm joint connecting structure and table lamp using same, belong to lamp accessories technical field. The connecting structure includes the fixed part and the connecting part of mutual cooperation, and the first connecting shaft outside of fixed part is equipped with the sleeve of gear, and the sleeve inside forms the limit chamber of intercommunication guide hole, the second connecting shaft of connecting part is equipped with the gear slot of adaptation with gear, and its outside movable sleeve is equipped with the movable ring of guide bar, and the guide bar stretches into the limit chamber and is equipped with the limit portion, and the limit portion is abuts with the spring between the sleeve. The utility model discloses spring pre -tightening structure, normality spring pushes and drives limit portion reset, makes gear slot and gear keep engagement and realizes rigid lock, and axial pull lamp arm can be unlocked angle, and after loosening hand, it is reset and locked. Effectively solve the problem that traditional damping pivot is easy to wear, and positioning is loose, and the fixedness of storage and unfolding state is poor, and the structure is simple, and convenient operation, and positioning is stable and long in service life, and is suitable for all kinds of adjustable angle table lamp use.

Description

Technical Field

[0001] This utility model specifically relates to a lamp arm joint connection structure and a table lamp using the same. Background Technology

[0002] In adjustable lighting devices such as table lamps and floor lamps, the lamp arm joint is the core component for adjusting the illumination angle, and its performance directly determines the ease of use and positioning stability of the lamp.

[0003] Currently, the industry commonly uses damping pivots as lamp arm joints, relying on the interference friction between the pivot and the bushing to achieve rotational positioning at any angle. However, the aforementioned damping pivot structure has many shortcomings in practical applications: First, after long-term repeated rotation, the friction contact surface will wear down, the damping force will gradually decrease, leading to a decrease in the positioning accuracy of the lamp arm, and even problems such as sagging or loosening, making it impossible to stably maintain the set illumination angle; Second, the damping pivot relies solely on frictional locking and lacks a rigid limiting structure. When the lamp arm is fully retracted or fully extended, it is prone to displacement when touched or vibrated by external forces, the retracted state cannot be reliably fixed, and it is easy to unfold on its own when moved or carried. Utility Model Content

[0004] In view of the defects of the existing technology, the technical problem to be solved by this utility model is to provide a lamp arm joint connection structure and a table lamp using the same.

[0005] A lamp arm joint connection structure includes a fixing part and a connecting part for connecting with a lamp arm; the fixing part has a first connecting shaft protruding from one side, a sleeve is provided on the first connecting shaft, a limiting cavity is formed between the first connecting shaft and the sleeve, a gear is fixed co-centered on the end of the sleeve away from the first connecting shaft, and guide holes are symmetrically opened on the sleeve at the end coplanar with the gear, the guide holes are connected to the limiting cavity;

[0006] The connecting part has a second connecting shaft protruding outward on one side. At one end of the second connecting shaft, there is a toothed groove that can mesh with the gear. A movable ring is rotatably sleeved on the second connecting shaft through a bearing. A guide rod extends from one side of the movable ring. The guide rod is movably inserted into the guide hole, and one end of the guide rod extends into the limiting cavity and is provided with a limiting part. A spring abuts between the limiting part and the sleeve. The spring keeps the gear and the toothed groove in a meshing state.

[0007] In one embodiment, the sleeve is detachably connected to the first connecting shaft.

[0008] In one embodiment, the first connecting shaft is provided with an external thread along its circumference, and the sleeve is connected to the external thread by a threaded engagement.

[0009] In one embodiment, the limiting part is hollow ring-shaped, and the inner diameter of the limiting part is larger than that of the first connecting shaft, which is located at the inner ring of the limiting part.

[0010] In one embodiment, a first mounting plate is provided on one side of the fixing part, and the first mounting plate is provided with two or more first mounting holes.

[0011] This utility model also provides a table lamp, including the above-mentioned lamp arm joint connection structure, and further including a fixed base, a first lamp arm, a second lamp arm, and a lamp head; wherein, the lamp head is disposed at the outer end of the second lamp arm, and the upper end of the fixed base and the inner end of the second lamp arm are each fixedly connected to a fixed part, and the upper and lower ends of the first lamp arm are each fixedly connected to a connecting part; the connecting part located at the lower end of the first lamp arm and the fixed part at the upper end of the fixed base are correspondingly fitted and assembled to form a lower rotating joint; the connecting part located at the upper end of the first lamp arm and the fixed part at the inner end of the second lamp arm are correspondingly fitted and assembled to form an upper rotating joint; through the axial unlocking and gear meshing locking functions of the two sets of lamp arm joint connection structures, the circumferential rotation adjustment and angle rigid fixation of the first lamp arm relative to the fixed base and the second lamp arm relative to the first lamp arm can be realized respectively, thereby driving the lamp head to adjust the illumination position and angle, and realizing the folding and unfolding positioning of the lamp arm as a whole.

[0012] In summary, the advantages of this utility model over the prior art are:

[0013] This invention employs a rigid locking mechanism using gears and tooth grooves, which differs from the friction-based positioning of traditional damping shafts. The locking force does not suffer from wear and attenuation, and it can maintain precise angular positioning even after long-term use. The lamp arm can be reliably fixed in both the retracted and extended states, and it is not easily displaced by external forces or vibrations, exhibiting significantly better stability than damping shafts.

[0014] Furthermore, the lamp arm can be unlocked and rotated simply by pulling it axially. After being released, it automatically resets and locks itself by relying on the spring. There is no need to set up additional control buttons or other operating parts. All adjustment actions can be completed with one hand, resulting in a smooth user experience. The guiding structure of the guide rod and guide hole ensures accurate meshing and alignment, eliminating the risk of jamming. Attached Figure Description

[0015] Figure 1 This is a perspective view of a lamp arm joint connection structure in one embodiment of the present utility model;

[0016] Figure 2 This is an exploded view of a lamp arm joint connection structure in one embodiment of the present invention;

[0017] Figure 3 This is a front view of a lamp arm joint connection structure in one embodiment of the present invention;

[0018] Figure 4 As one embodiment of this utility model Figure 3 BB cross-section;

[0019] Figure 5 As one embodiment of this utility model Figure 3 AA cross-section view. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0021] like Figures 1 to 5 The present invention preferably provides a lamp arm joint connection structure, including a fixing part 2 and a connecting part 4; the fixing part 2 has a first connecting shaft 5 protruding from one side, a sleeve 6 is provided on the first connecting shaft 5, a limiting cavity 7 is formed between the first connecting shaft 5 and the sleeve 6, a gear 8 is fixedly fixed at the same center on the end of the sleeve 6 away from the first connecting shaft 5, and guide holes 9 are symmetrically opened on the end of the sleeve 6 coplanar with the gear 8, the guide holes 9 are connected to the limiting cavity 7; the connecting part 4 The second connecting shaft 10 protrudes outward on one side. At one end of the second connecting shaft 10, there is a tooth groove 11 that is concentrically recessed and can mesh with the gear 8. A movable ring 12 is rotatably sleeved on the second connecting shaft 10 through a bearing. A guide rod 13 extends from one side of the movable ring 12. The guide rod 13 is movably inserted into the guide hole 9, and one end of the guide rod 13 extends into the limiting cavity 7 and is provided with a limiting part 14. A spring 15 abuts between the limiting part 14 and the sleeve 6. The spring 15 keeps the gear 8 and the tooth groove 11 in a meshing state.

[0022] Specifically, this solution adopts the working principle of axial sliding unlocking, gear meshing locking, and spring automatic reset. The specific process is as follows:

[0023] When in the normal locked state, the spring in the limiting cavity is always in a compressed state, applying an axial thrust to the limiting part toward the fixed part; the limiting part drives the guide rod to move axially along the guide hole, thereby pushing the movable ring and the second connecting axial gear to press together, so that the tooth groove at the end of the second connecting shaft and the gear at the end of the sleeve are in a meshing state; due to the circumferential meshing and limiting of the gear and the tooth groove, the fixed part and the connecting part cannot rotate relative to each other, thus achieving rigid locking of the fixed part and the connecting part.

[0024] When unlocking rotation is required, an outward axial force is applied to the connecting part. The force overcomes the spring force and drives the second connecting shaft, the movable ring and the guide rod to move outward axially in sync, so that the tooth groove and the gear disengage. At this time, the circumferential constraint between the fixed part and the connecting part is released, and the two can rotate relative to each other around a common axis, so as to realize the free adjustment of the angle of adjacent lamp arms.

[0025] When resetting and locking, after rotating to the target angle, the axial tension is released. The spring force pushes the limiting part, guide rod, movable ring, and second connecting shaft to axially reset. The tooth groove and gear re-align and mesh, forming a circumferential rigid lock again, thus fixing the angle of the adjacent lamp arm. Among them, the sliding fit between the guide rod and the guide hole plays an axial guiding role, ensuring that the gear and tooth groove are always coaxially aligned and avoiding meshing misalignment; the limiting cavity is used to limit the axial movement stroke of the limiting part and prevent the guide rod from dislodging from the guide hole.

[0026] Furthermore, the sleeve 6 is detachably connected to the first connecting shaft 5.

[0027] Specifically, the sleeve and the first connecting shaft are detachably connected. The internal spring, limiting part and other parts can be taken out by disassembling the sleeve, which is convenient for individual replacement and maintenance of the parts. At the same time, the pre-compression of the spring can be adjusted by replacing the sleeve with different lengths or adding or removing shims to adapt to different locking force requirements.

[0028] Furthermore, the first connecting shaft 5 is provided with an external thread along its circumference, and the sleeve 6 is connected to the external thread through a threaded engagement.

[0029] Specifically, the outer wall of the first connecting shaft is provided with an external thread, and the inner wall of the sleeve is provided with a corresponding internal thread. By rotating the sleeve, its axial position on the first connecting shaft can be changed, thereby compressing or releasing the spring in the limiting cavity and realizing stepless adjustment of the locking force. The threaded connection has a self-locking characteristic, and can maintain its position after adjustment and will not loosen due to vibration or rotation.

[0030] Furthermore, the limiting part 14 has a hollow ring shape, and the inner diameter of the limiting part 14 is larger than that of the first connecting shaft 5, which is located at the inner ring of the limiting part 14.

[0031] Specifically, the limiting part is designed as a hollow ring structure, and the first connecting shaft passes through the inner ring of the limiting part, so that the limiting part can slide axially along the outer wall of the first connecting shaft. On the one hand, the first connecting shaft is used to achieve radial limiting, so as to avoid the limiting part from radially shaking in the limiting cavity and improve the stability of the structure. On the other hand, the outer space of the first connecting shaft is fully utilized to arrange the parts, making the overall structure of the joint more compact.

[0032] Preferably, the limiting part can be detachably connected to the guide rod via a snap fastener.

[0033] Furthermore, a first mounting plate 16 is provided on one side of the fixing part 2, and the first mounting plate 16 is provided with two or more first mounting holes 17.

[0034] Specifically, the fixing part is fastened to the external mounting object by bolts or other means through multiple first mounting holes on the first mounting plate. Multi-point fixing ensures connection rigidity and avoids warping deformation when the joint is under stress. At the same time, the modular mounting structure can be adapted to lamp arms with different cross-sectional sizes, improving the product's versatility.

[0035] A preferred embodiment of this utility model provides a table lamp, including the aforementioned lamp arm joint connection structure, and further including a fixing base 18, a first lamp arm 1, a second lamp arm 3, and a lamp head 19; wherein, the lamp head 19 is disposed at the outer end of the second lamp arm 3, and the upper end of the fixing base 18 and the inner end of the second lamp arm 3 are each fixedly connected to a fixing part 2, and the upper and lower ends of the first lamp arm 1 are each fixedly connected to a connecting part 4; the connecting part 4 located at the lower end of the first lamp arm 1 is correspondingly fitted with the fixing part 2 at the upper end of the fixing base to form a lower rotating joint; the connecting part 4 located at the upper end of the first lamp arm 1 is correspondingly fitted with the fixing part 2 at the inner end of the second lamp arm 3 to form an upper rotating joint; through the axial unlocking and gear meshing locking functions of the two sets of lamp arm joint connection structures, the circumferential rotation adjustment and angle rigid fixation of the first lamp arm 1 relative to the fixing base 18 and the second lamp arm 3 relative to the first lamp arm 1 can be realized respectively, thereby driving the lamp head 19 to adjust the illumination position and angle, realizing the overall folding and unfolding positioning of the lamp arm.

[0036] The fixing part has two parts, namely the first fixing part and the second fixing part. The first fixing part is fastened to the fixing seat by bolts or other means, and the second fixing part is fastened to the second lamp arm by bolts or other means, so as to ensure the connection rigidity by fixing at multiple points.

[0037] The above-mentioned lamp arm joint connection structure is applied to a table lamp. The fixed base is placed on the table to provide support. The first lamp arm and the second lamp arm can be adjusted to multiple angles and rigidly locked through the joint structure. The lamp head can be adjusted in position and angle synchronously with the second lamp arm to meet different illumination needs. The lamp arm can be rigidly fixed in both the retracted and extended states through the joint, and the placement and movement are stable and reliable.

[0038] When using the desk lamp, the mounting base rests on the support surface for support. To adjust the illumination angle, a pulling force is applied to the second lamp arm, causing the second connecting shaft to move axially via the connecting part. This disengages the gear teeth from the gears. The second lamp arm is then rotated, causing the lamp head to rotate around the joint axis to the target angle. Releasing the second lamp arm causes the spring to drive the second connecting shaft to return to its axial position, re-engaging the gear teeth and locking the lamp head at the target angle. The lamp arm's retracted and extended states are rigidly fixed via gear engagement, ensuring stability and reliability during placement and movement.

[0039] Furthermore, the connecting part 4 is integrally formed on the first lamp arm 1.

[0040] Specifically, the connecting part is integrally formed with the first lamp arm, eliminating the assembly process between the connecting part and the first lamp arm, eliminating assembly gaps, improving the overall structure and transmission rigidity, ensuring accurate transmission of rotation angle, and reducing the number of parts and assembly costs.

[0041] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A lamp arm joint connection structure, characterized in that: It includes a fixing part (2) and a connecting part (4) for connecting with the lamp arm; The fixing part (2) has a first connecting shaft (5) protruding outward on one side, and a sleeve (6) is provided on the first connecting shaft (5). A limiting cavity (7) is formed between the first connecting shaft (5) and the sleeve (6). A gear (8) is fixed at the same center on the sleeve (6) at the end away from the first connecting shaft (5), and a guide hole (9) is symmetrically opened on the sleeve (6) at the end coplanar with the gear (8). The guide hole (9) is connected to the limiting cavity (7); The connecting part (4) has a second connecting shaft (10) protruding outward on one side. At one end of the second connecting shaft (10), there is a tooth groove (11) that can mesh with the gear (8). A movable ring (12) is rotatably sleeved on the second connecting shaft (10) through a bearing. A guide rod (13) extends from one side of the movable ring (12). The guide rod (13) is movably inserted into the guide hole (9), and one end of the guide rod (13) extends into the limiting cavity (7) and is provided with a limiting part (14). A spring (15) abuts between the limiting part (14) and the sleeve (6). The spring (15) keeps the gear (8) and the tooth groove (11) in a meshing state.

2. The lamp arm joint connection structure according to claim 1, characterized in that: The sleeve (6) is detachably connected to the first connecting shaft (5).

3. The lamp arm joint connection structure according to claim 2, characterized in that: The first connecting shaft (5) has an external thread along its circumference, and the sleeve (6) is connected to the external thread through a threaded fit.

4. The lamp arm joint connection structure according to claim 1, characterized in that: The limiting part (14) is hollow ring-shaped, and the inner diameter of the limiting part (14) is larger than that of the first connecting shaft (5). The first connecting shaft (5) is located at the inner ring of the limiting part (14).

5. The lamp arm joint connection structure according to claim 1, characterized in that: The fixing part (2) has a first mounting plate (16) on one side, and the first mounting plate (16) has two or more first mounting holes (17).

6. A table lamp, characterized in that: The lamp arm joint connection structure according to any one of claims 1 to 5 further includes a fixing seat (18), a first lamp arm (1), a second lamp arm (3) and a lamp head (19). The lamp head (19) is located at the outer end of the second lamp arm (3). The upper end of the fixing seat (18) and the inner end of the second lamp arm (3) are each fixedly connected to a fixing part (2). The upper and lower ends of the first lamp arm (1) are each fixedly connected to a connecting part (4). The connecting part (4) located at the lower end of the first lamp arm (1) and the fixing part (2) at the upper end of the fixing seat are correspondingly fitted and assembled to form a lower rotating joint. The connecting part (4) located at the upper end of the first lamp arm (1) and the fixing part (2) at the inner end of the second lamp arm (3) are correspondingly fitted and assembled to form an upper rotating joint. Through the axial unlocking and gear meshing locking functions of the two sets of lamp arm joint connection structures, the circumferential rotation adjustment and angle rigid fixation of the first lamp arm (1) relative to the fixing seat (18) and the second lamp arm (3) relative to the first lamp arm (1) can be realized respectively, thereby driving the lamp head (19) to adjust the illumination position and angle, and realizing the overall folding and unfolding positioning of the lamp arm.

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