Self-locking support arm and monitor stand

Abstract

This utility model belongs to the field of bracket technology and discloses a self-locking support arm and a monitor bracket. The self-locking support arm has a support base, a connector, a bracket arm, and a locking component. The bracket arm includes a lower arm and an upper arm. The two ends of the lower arm are respectively hinged to the support base and the connector along the length direction of the bracket arm. The two ends of the upper arm are respectively hinged to the support base and the connector along the length direction of the bracket arm. The locking component is disposed between the support base and the bracket arm or between the connector and the bracket arm. The locking component has a locked state and an unlocked state. When it is in the unlocked state, the connector can move up and down relative to the support base. When it is in the locked state, the locking component can prevent the connector from descending. The monitor bracket adopts the above-mentioned self-locking support arm to achieve downward locking and improve the overall user experience.

Description

Technical Field

[0001] This utility model relates to the field of bracket technology, and in particular to a self-locking support arm and a monitor bracket. Background Technology

[0002] In medical, factory, and other work environments, some monitor stands are wall-mounted and equipped with keyboard trays for operation. Currently, monitor stands in these scenarios often use a self-balancing arm structure to support the keyboard tray. However, in actual use, keyboard operation generates continuous downward pressure, causing the cantilever structure to drop, thus requiring frequent adjustments to the stand height. This design causes inconvenience during use and affects the user experience. Utility Model Content

[0003] The purpose of this invention is to provide a self-locking support arm and monitor stand that can be locked downwards, thereby improving the overall user experience.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] The self-locking support arm includes:

[0006] The support base has a first hinge point and a second hinge point;

[0007] The connector has a third hinge point and a fourth hinge point;

[0008] The support arm includes a lower arm and an upper arm. The two ends of the lower arm are respectively hinged to the first hinge point and the third hinge point along the length direction of the support arm. The two ends of the upper arm are respectively hinged to the second hinge point and the fourth hinge point along the length direction of the support arm.

[0009] A locking component is disposed between the support base and the bracket arm or between the connector and the bracket arm. The locking component has a locked state and an unlocked state. In the unlocked state, the connector can move up and down relative to the support base. In the locked state, the locking component can prevent the connector from descending.

[0010] In some embodiments, the locking assembly includes a locking member and a cooperating movable member and a fixing member. The locking member is connected to the movable member or the fixing member and is used to change the engagement state of the movable member and the fixing member, so that the locking assembly switches between the locked state and the unlocked state. One of the movable member and the fixing member is disposed on the support base or the connector head, and the other is disposed on the lower arm or the upper arm.

[0011] In some embodiments, the movable component is a swinging component, which is rotatably mounted on the connector head and has an abutting end; the fixed component is a limiting block, which has a first limiting structure; the locking component is fixedly connected to the limiting block, and the limiting block is slidably engaged on the lower arm, and the locking component is used to drive the limiting block to move along the lower arm; when the abutting end of the swinging component contacts the first limiting structure, the locking component is in a locked state; when the abutting end moves away from the first limiting structure, the locking component is in an unlocked state.

[0012] In some embodiments, the contact surface of the limiting block that contacts the abutting end of the swing member includes adjacent toothed surfaces and a plane along the width direction of the support arm, wherein the first limiting structure is the toothed surface. By operating the locking member to drive the limiting block to move, the abutting end of the swing member switches between the toothed surface and the plane. When the abutting end contacts the toothed surface, the locking component is in the locked state. When the abutting end contacts the plane, the locking component is in the unlocked state.

[0013] In some embodiments, the toothed surface is provided with a plurality of spaced first teeth along the length direction of the support arm, wherein the surface of the first tooth near the connector is a plane, and the surface away from the connector is an arc or a slope.

[0014] In some embodiments, two locking members are provided, with the two locking members respectively located on both sides of the limiting block, and the lower arm is provided with a through hole for the locking members to slide and engage.

[0015] In some embodiments, the movable member is a stop member, which is rotatably mounted on the lower arm, and the stop member has a first abutment tip and a second abutment tip; the fixing member is a second limiting structure disposed on the connector head; and the locking member has an abutment position and a disengagement position with respect to the first abutment tip; in the disengagement position, the second abutment tip abuts against the second limiting structure, and the locking component is in the locked state; in the abutment position, the second abutment tip separates from the second limiting structure, and the locking component is in the unlocked state.

[0016] In some embodiments, the locking member slides on the lower arm to drive the abutment member to abut or separate from the second limiting structure.

[0017] In some embodiments, the side of the connector facing the abutment is a convex arc surface, and the second limiting structure includes a plurality of second teeth arranged at intervals along the convex arc surface, and the second abutment tip can abut between two adjacent second teeth.

[0018] In some embodiments, the locking assembly further includes a torsion spring, one end of which is limited to the lower arm and the other end to the abutment, the torsion spring causing the second abutment to tend to abut against the second limiting structure.

[0019] In some embodiments, the self-locking support arm further includes an elastic element connected between the support arm and the support base, between the support arm and the connector, or between the lower arm and the upper arm, for supporting the connector to hover.

[0020] A monitor stand is also provided, comprising:

[0021] The self-locking support arm as described above;

[0022] A fixed support arm is provided at one end with a clamping seat and at the other end with a support seat.

[0023] The beneficial effects of this utility model are:

[0024] When it is necessary to adjust the hovering position of the connector, the locking component can be adjusted to the unlocked state. In this state, the hovering height of the connector can be adjusted. Then, the locking component can be adjusted to the locked state to limit the descent of the connector. When the connector is subjected to appropriate pressure, the locking component can prevent the connector from descending, and the connector can still maintain the above hovering position. There is no need to frequently adjust the hovering height, which improves applicability and user experience. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a display bracket using the self-locking support arm in Embodiment 1 of this utility model;

[0026] Figure 2 This is an exploded view of the self-locking support arm in Embodiment 1 of this utility model;

[0027] Figure 3 This is a schematic diagram of the contact end of the swinging member disengaging from the first limiting structure in Embodiment 1 of this utility model;

[0028] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 This is a schematic diagram of the limiting block in Embodiment 1 of this utility model;

[0030] Figure 6 This is a cross-sectional view of the contact end of the swinging member disengaging from the first limiting structure in Embodiment 1 of this utility model;

[0031] Figure 7 This is a schematic diagram of the contact end of the swinging member contacting the first limiting structure in Embodiment 1 of this utility model;

[0032] Figure 8 This is a cross-sectional view of the contact end of the swinging member in the first embodiment of this utility model, which contacts the first limiting structure.

[0033] Figure 9 This is a schematic diagram of the display bracket of the present invention using the self-locking support arm in Embodiment 2;

[0034] Figure 10 This is an exploded view of the self-locking support arm in Embodiment 2 of this utility model;

[0035] Figure 11 This is a schematic diagram of the abutment component disengaging from the second limiting structure in Embodiment 2 of this utility model;

[0036] Figure 12 yes Figure 11 Enlarged view at point B in the middle;

[0037] Figure 13 This is a schematic diagram of the abutment component in Embodiment 2 of this utility model;

[0038] Figure 14 This is a cross-sectional view of the contact between the abutment member and the second limiting structure in Embodiment 2 of this utility model.

[0039] In the picture:

[0040] 1. Support base; 11. First hinge point; 12. Second hinge point;

[0041] 2. Connector; 21. Third hinge point; 22. Fourth hinge point;

[0042] 3. Support arm; 31. Lower arm; 311. Through hole; 32. Upper arm;

[0043] 4. Locking assembly; 41. Swinging component; 411. Abutting end; 42. Limiting block; 421. Tooth surface; 4211. First tooth; 422. Plane; 43. Locking component; 44. Abutting component; 441. First abutting tip; 442. Second abutting tip; 443. Third abutting tip; 444. Receiving groove; 45. Second tooth; 46. Torsion spring; 47. Push key; 48. Rotating shaft;

[0044] 5. Elastic components;

[0045] 6. Fix the support arm;

[0046] 7. Clamping seat. Detailed Implementation

[0047] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0048] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 based on the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0051] Example 1:

[0052] like Figures 1 to 8As shown, this embodiment provides a self-locking support arm, which has a support base 1, a connector 2, a bracket arm 3, and a locking component 4. The support base 1 has a first hinge point 11 and a second hinge point 12; the connector 2 has a third hinge point 21 and a fourth hinge point 22. The connector 2 is used to fix an external object to be fixed or an external clamp with a fixed object. The external clamp with a fixed object can be, but is not limited to, a microphone, a display, or a mobile device. The bracket arm 3 includes a lower arm 31 and an upper arm 32. The two ends of the lower arm 31 are respectively hinged to the first hinge point 11 and the third hinge point 21 along the length direction of the bracket arm 3. The two ends of the upper arm 32 are respectively hinged to the second hinge point 12 and the fourth hinge point 22 along the length direction of the bracket arm 3. Thus, the connector 2, the upper arm 32, the lower arm 31, and the support base 1 form a quadrilateral linkage structure. Exemplarily, the upper arm 32 and the lower arm 31 adopt a groove-shaped structure. The locking component 4 is disposed between the support base 1 and the bracket arm 3 or between the connector 2 and the bracket arm 3. The locking component 4 has a locked state and an unlocked state. When it is in the unlocked state, the connector 2 can move up and down relative to the support base 1. When it is in the locked state, the locking component 4 can prevent the connector 2 from descending.

[0053] When it is necessary to adjust the hovering position of connector 2, the locking component 4 can be adjusted to the unlocked state. In this state, the hovering height of connector 2 can be adjusted. Then, the locking component 4 can be adjusted to the locked state to restrict connector 2 from descending. When appropriate pressure is applied to connector 2, the locking component 4 can prevent connector 2 from descending, and connector 2 can still maintain the above hovering position. There is no need to frequently adjust the hovering height, which improves applicability and user experience.

[0054] In some embodiments, the locking component 4 includes a locking member 43 and a cooperating movable member and a fixed member. One of the movable member and the fixed member is disposed on the support base 1 or the connector 2, while the other is disposed on the upper arm 32 or the lower arm 31. The locking member 43 is connected to the movable member or the fixed member. The locking member 43 is used to change the cooperation state between the movable member and the fixed member, thereby enabling the locking component 4 to switch between a locked state and an unlocked state, making the switching state more convenient.

[0055] In one embodiment, the movable component is a swinging component 41, one end of which is rotatably mounted on the connector 2. The swinging component 41 is rotatably connected to the third hinge point 21 and the fourth hinge point 22 of the connector 2. The fixed component is a limiting block 42, which can be disposed on the upper arm 32 or the lower arm 31. When the swinging component 41 is rotatably mounted on the third hinge point 21, the limiting block 42 is disposed on the upper arm 32; when the swinging component 41 is rotatably mounted on the fourth hinge point 22, the limiting block 42 is disposed on the lower arm 31. It is understood that the support arm 3, the support base 1, and the connector 2 are all rotatably connected via a rotating shaft, and the swinging component 41 has a connecting hole for the rotating shaft to pass through.

[0056] In the current embodiment, taking the limiting block 42 disposed on the lower arm 31 as an example, the end of the swing member 41 away from the connector 2 is set as the abutment end 411. The limiting block 42 is slidably fitted on the lower arm 31. The limiting block 42 has a first limiting structure. The locking member 43 is used to drive the limiting block 42 to move along the lower arm 31 so that the abutment end 411 can contact or move away from the first limiting structure. When the abutment end 411 contacts the first limiting structure, the locking component 4 is in a locked state; when the abutment end 411 moves away from the first limiting structure, the locking component 4 is in an unlocked state. In some alternative embodiments, the swing member 41 may also be disposed on the support base 1, which will not be described in detail here.

[0057] like Figure 4 As shown, in the current embodiment, the contact surface where the limiting block 42 contacts the abutting end 411 of the swing member 41 includes adjacent toothed surfaces 421 and plane 422 along the width direction of the support arm 3. The first limiting structure is the aforementioned toothed surface 421. By operating the locking member 43, the limiting block 42 is driven to move along the width direction of the support arm 3, thereby enabling the abutting end 411 to switch between moving on the toothed surface 421 and the plane 422, thus achieving the desired effect. Figure 7 and Figure 8 As shown, when the contact end 411 contacts the tooth surface 421, the locking component 4 is in a locked state; Figure 4 and Figure 6 As shown, when the contact end 411 contacts the plane 422, the locking component 4 is in the unlocked state.

[0058] Specifically, such as Figure 5As shown, the tooth surface 421 is provided with multiple spaced first teeth 4211 along the length direction of the support arm 3. When the contact end 411 contacts the tooth surface 421, the contact end 411 can abut between two adjacent first teeth 4211. The surface of the first tooth 4211 near the connector 2 is flat, and the surface away from the connector 2 is curved or inclined. Since the connector 2, upper arm 32, lower arm 31 and support base 1 form a quadrilateral linkage structure, when the contact end 411 abuts between two adjacent first teeth 4211 and the connector 2 tends to move downward, the contact end 411 will move away from the connector 2 along the length direction of the lower arm 31. The contact end 411 will be stopped from moving by the first teeth 4211, thereby preventing the connector 2 from moving downward. The flat surface of the first tooth 4211 near the connector 2 can further prevent the movement of the contact end 411, thereby increasing stability. When the contact end 411 abuts against the two adjacent first teeth 4211 and the connector 2 shows an upward tendency, the contact end 411 will move towards the connector 2 along the length direction of the lower arm 31. Since the surface of the first tooth 4211 facing away from the connector 2 is an arc or inclined surface, the contact end 411 can pass over the first tooth 4211. Therefore, even if the contact end 411 is located inside the first tooth 4211, the connector 2 can still move upward.

[0059] When the locking member 43 drives the limiting block 42 to move, and the contact end 411 moves to the plane 422 of the limiting block 42, the contact end 411 is released from the restriction of the first tooth 4211, and the connector 2 can move freely up and down.

[0060] like Figures 2 to 5 As shown, in this embodiment, two locking members 43 are provided, respectively disposed on opposite sides of the limiting block 42, so that pushing one of the locking members 43 can move the limiting block 42. To facilitate the placement of the locking members 43, the lower arm 31 has through holes 311 at both ends along the width direction of the support arm 3 for the locking members 43 to slide within the through holes 311. Exemplarily, the locking member 43 and the limiting block 42 can be connected by, but not limited to, plugging, snapping, or welding. In this embodiment, one of the opposite ends of the limiting block 42 and one of the locking members 43 is provided with a plug, and the other is provided with a socket that mates with the plug, thus enabling them to be plugged in. In this embodiment, the socket is provided on the limiting block 42; and the locking member 43 is T-shaped, with the end of the locking member 43 being the aforementioned plug.

[0061] In addition, such as Figure 2As shown, the self-locking support arm also includes an elastic element 5. The elastic element 5 is connected between the support arm 3 and the support base 1, between the support arm 3 and the connector 2, or between the lower cantilever and the upper arm 32, thereby enabling the connector 2 to be suspended by the elastic element 5. The form of the elastic element 5 is not limited; it can be a tension spring or a pneumatic spring. In the current embodiment, the elastic element 5 is a pneumatic spring, with one end connected to the support base 1 and the other end connected to the upper arm 32 of the support arm 3.

[0062] Example 2:

[0063] like Figures 9 to 14 As shown, this embodiment provides another self-locking support arm, which differs from Embodiment 1 in that, as... Figures 10 to 13 As shown, the movable component is the abutment component 44, which is rotatably mounted on the lower arm 31 via a rotating shaft 48; the fixed component is a second limiting structure provided on the connector 2. The abutment component 44 has a first abutment tip 441 and a second abutment tip 442, and the locking component 43 has an abutment position and a disengaged position with respect to the first abutment tip 441, as shown. Figure 14 As shown, when in the disjoint position, the second abutment 442 abuts against the second limiting structure, at which time the locking component 4 is in a locked state; as Figure 11 As shown, when in the top position, the second top point 442 separates from the second limiting structure, and the locking component 4 is in the unlocked state.

[0064] like Figure 10 As shown, in the current embodiment, the locking member 43 slides on the lower arm 31 to drive the abutment member 44 to abut or separate from the second limiting structure. Specifically, a slide rail is provided on the lower arm 31, and a slider is provided on the abutment member 44, with the slider sliding within the slide rail. To better move the abutment member 44, the locking assembly 4 also includes a push key 47. The slide rail passes through the lower arm 31, and the abutment member 44 and the push key are located on the inner and outer sides of the lower arm 31. The slider passes through the slide rail, and the push key is installed on the slider by plugging, snapping, or bolting, thereby pushing the push key on the outside of the lower arm 31 to move the abutment member 44.

[0065] like Figure 10 and Figure 12 As shown, in the current embodiment, the locking component 4 includes a torsion spring 46. One end of the torsion spring 46 is limited to the lower arm 31, and the other end is limited to the abutment member 44, thereby causing the second abutment point 442 to tend to abut against the second limiting structure through the torsion spring 46. Exemplarily, the lower arm 31 is provided with an insertion hole, and one end of the torsion spring 46 is inserted into the insertion hole; while the abutment member 44 is provided with a third abutment point 443, and the other end of the torsion spring 46 is bent and abuts against the third abutment point 443. In order to accommodate the torsion spring 46, the abutment member 44 is provided with a mounting groove 444, the rotating shaft 48 passes through the mounting groove 444, and the torsion spring 46 is placed in the mounting groove 444 and sleeved on the rotating shaft 48.

[0066] like Figure 12 As shown, in some embodiments, the side of the connector 2 facing the abutment 44 is a convex arc surface. The second limiting structure includes a plurality of second teeth 45 arranged at intervals along the convex arc surface, and the second abutment tip 442 abuts between two adjacent second teeth 45. Since the connector 2, upper arm 32, lower arm 31 and support base 1 form a quadrilateral linkage structure, when the second abutment tip 442 abuts between two adjacent second teeth 45, the torsion spring 46 keeps the second abutment tip 442 between the two adjacent second teeth 45. When the connector 2 tends to move upward, the side of the second tooth 45 can abut the second abutment tip 442, causing the abutment 44 to rotate and compress the torsion spring 46, causing the second abutment tip 442 to briefly disengage from the current second tooth 45 and move past the second tooth 45 towards the second tooth 45 on the side closer to the lower arm 31. When the connector 2 loses its upward movement tendency, the torsion spring 46 continues to keep the second abutment tip 442 abutting between the two second teeth 45. When the connector 2 shows a downward tendency, the second tooth 45 applies a reverse force to the abutment 44. The abutment 44 cannot compress the torsion spring 46 in the reverse direction, and therefore cannot rotate, thus preventing the connector 2 from moving downward. For example, to facilitate the upward movement of the connector 2, the side of the second tooth 45 facing the lower arm 31 is a flat surface; the side of the second tooth 45 facing the upper arm 32 is an arc surface or a slope.

[0067] The rest of the structure is the same as in Example 1, and will not be described again.

[0068] This application also provides a monitor stand, which includes a self-locking support arm and a fixed support arm 6 as described in any of the above embodiments. One end of the fixed support arm 6 is connected to a clamping seat 7, and the other end is connected to a support base 1. The support base 1 is used to fix the monitor stand to an external fastener. The external fastener can be a desktop or a wall.

[0069] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A self-locking support arm, characterized in that, include: The support base (1) has a first hinge point (11) and a second hinge point (12); The connector (2) has a third hinge point (21) and a fourth hinge point (22); The support arm (3) includes a lower arm (31) and an upper arm (32). The two ends of the lower arm (31) are respectively hinged to the first hinge point (11) and the third hinge point (21) along the length direction of the support arm (3). The two ends of the upper arm (32) are respectively hinged to the second hinge point (12) and the fourth hinge point (22) along the length direction of the support arm (3). A locking component (4) is disposed between the support base (1) and the bracket arm (3) or between the connector (2) and the bracket arm (3). The locking component (4) has a locked state and an unlocked state. When in the unlocked state, the connector (2) can move up and down relative to the support base (1). When in the locked state, the locking component (4) can prevent the connector (2) from descending.

2. The self-locking support arm according to claim 1, characterized in that The locking component (4) includes a locking member (43) and a cooperating movable member and a fixing member. The locking member (43) is connected to the movable member or the fixing member. The locking member (43) is used to change the cooperation state of the movable member and the fixing member, so that the locking component (4) switches between the locked state and the unlocked state. One of the movable member and the fixing member is disposed on the support base (1) or the connector (2), and the other is disposed on the lower arm (31) or the upper arm (32).

3. The self-locking support arm according to claim 2, characterized in that The movable component is a swing component (41), which is rotatably mounted on the connector (2). The swing component (41) has an abutment end (411). The fixed component is a limiting block (42), which has a first limiting structure. The locking component (43) is fixedly connected to the limiting block (42), and the limiting block (42) is slidably fitted on the lower arm (31). The locking component (43) is used to drive the limiting block (42) to move along the lower arm (31). When the abutment end (411) of the swing component (41) contacts the first limiting structure, the locking component (4) is in a locked state. When the contact end (411) moves away from the first limiting structure, the locking component (4) is in the unlocked state.

4. The self-locking support arm of claim 3, wherein, The contact surface of the limiting block (42) that contacts the abutting end (411) of the swing member (41) includes adjacent toothed surfaces (421) and planes (422) along the width direction of the support arm (3). The first limiting structure is the toothed surface (421). By operating the locking member (43), the limiting block (42) is driven to move, so that the abutting end (411) of the swing member (41) switches between the toothed surface (421) and the plane (422). When the contact end (411) contacts the tooth surface (421), the locking component (4) is in the locked state; When the contact end (411) contacts the plane (422), the locking component (4) is in the unlocked state.

5. The self-locking support arm of claim 4, wherein, The tooth surface (421) is provided with a plurality of first teeth (4211) arranged at intervals along the length direction of the support arm (3). The surface of the first tooth (4211) near the connector (2) is a plane, and the surface away from the connector (2) is an arc or a slope.

6. The self-locking support arm according to claim 3, characterized in that, The locking member (43) is provided in two parts, and the two locking members (43) are respectively provided on both sides of the limiting block (42). The lower arm (31) is provided with a through hole (311) for the locking member (43) to slide and engage.

7. The self-locking support arm of claim 2, wherein, The movable component is a stop component (44), which is rotatably mounted on the lower arm (31). The stop component (44) has a first stop tip (441) and a second stop tip (442). The fixing component is a second limiting structure provided on the connector (2). The locking component (43) has a stop position and a disengagement position with the first stop tip (441). In the disengagement position, the second stop tip (442) abuts against the second limiting structure, and the locking component (4) is in the locked state. In the stop position, the second stop tip (442) separates from the second limiting structure, and the locking component (4) is in the unlocked state.

8. The self-locking support arm of claim 7, wherein, The locking member (43) slides on the lower arm (31) to drive the abutting member (44) to abut or separate from the second limiting structure.

9. The self-locking support arm of claim 7, wherein, The side of the connector (2) facing the abutment (44) is an outwardly convex arc surface. The second limiting structure includes a plurality of second teeth (45) arranged at intervals along the outwardly convex arc surface. The second abutment tip (442) can abut between two adjacent second teeth (45).

10. The self-locking support arm of claim 7, wherein, The locking assembly (4) further includes a torsion spring (46), one end of which is limited to the lower arm (31) and the other end is limited to the abutment (44), the torsion spring (46) causing the second abutment (442) to tend to abut against the second limiting structure.

11. The self-locking support arm according to any one of claims 1-10, characterized in that, The self-locking support arm also includes an elastic element (5), which is connected between the support arm (3) and the support base (1), between the support arm (3) and the connector (2), or between the lower arm (31) and the upper arm (32) to support the connector (2) to be suspended.

12. A display stand, characterised in that include: The self-locking support arm as described in any one of claims 1-11; A fixed support arm (6) is provided at one end of a clamping seat (7) and at the other end is connected to the support seat (1).

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