TWI912889B - A screw mechanism that allows for quick loosening and locking. - Google Patents

Abstract

This invention discloses a screw mechanism that can be quickly loosened and locked, comprising: a main body, at least one engagement block, a control rod, a fixing member, a reset unit, a control member, and an elastic member. In use, the screw mechanism can be directly and quickly slid onto the screw for engagement. By rotating the screw mechanism, the screw mechanism can be displaced on the screw. The user can easily and quickly remove the screw mechanism from the screw by simply rotating the control member. It is easy to operate. When the screw mechanism and the screw are separated by external force, the locking teeth will engage more firmly, thus improving stability and practicality.

Description

A screw mechanism that allows for quick loosening and locking.

This invention relates to a screw mechanism, and more particularly to a screw mechanism that can quickly loosen and lock.

A screw mechanism is a mechanism that uses the rotational motion of a screw to achieve linear movement. The advantages of a screw mechanism include simple structure, easy manufacturing and installation, strong load-bearing capacity, and high transmission accuracy.

As disclosed in Patent No. I599423, a screw mechanism includes: a main body, a sliding assembly, a screw assembly, at least one control member, and at least one elastic element. The main body has a through first pivot and at least one receiving groove, which communicates with the first pivot. The screw assembly has a screw and a rotating member connected to the screw and a rotating member. One end of the rotating member is engaged with the screw, and the other end passes through the first pivot and is connected to the sliding assembly. The control member is received in the receiving groove and has a second engagement portion. The elastic element is received in the receiving groove of the main body and springs against the control member to cause the second engagement portion to engage with the first engagement portion. In use, the screw assembly can rotate and shift within the first pivot, driving the sliding assembly to slide linearly, and can press the control member to keep the elastic element in a compressed state. The second threaded part of the control member disengages from the first threaded part of the screw, so that the screw assembly can be operated to quickly shift at the first pivot, while simultaneously driving the sliding assembly to quickly adjust its position.

However, with this conventional screw mechanism, when operating the screw assembly to move rapidly forward and backward, one hand must press the control component while the other hand holds the rotating component. This operation is inconvenient and awkward. In addition, the control component is radially resisted by an elastic element, which makes it difficult for the second threaded part of the control component to engage with the first threaded part of the screw. This results in inaccurate engagement and poor positioning stability, making it not only inconvenient to use but also greatly reducing its practicality.

In view of the aforementioned shortcomings of conventional screw mechanisms, the inventor conceived the idea of innovation and, after extensive discussions, prototype testing, and numerous revisions and improvements, has launched this invention.

This invention provides a screw mechanism for quick loosening and locking, comprising: a main body with a virtual axis at its center, a through hole at one end, and a receiving hole at the other end, the receiving hole communicating with the through hole; the inner wall of the receiving hole having at least one groove, the at least one groove having a guide slope, the guide slope being closer to the virtual axis near the through hole and further away from the virtual axis, forming a slope shape from near to far; at least one engagement block, installed in at least one groove of the main body, the at least one engagement block having a sliding slope sliding on the guide slope, and an engagement tooth on its inner side; a control lever, one end... A drive groove is provided at the center of the receiving hole of the main body. The drive groove is closer to the virtual axis near the end of the hole and farther away from the virtual axis, forming an inclined surface from near to far. The drive groove engages with the at least one engagement block. The control rod has a through hole inside, which communicates with the hole of the main body. The control rod also has an operable operating section and a reset unit for pushing the at least one engagement block towards the hole. By operating the operating section, the engagement block can be controlled to move between the inner and outer positions in coordination with the guide inclined surface and the drive groove.

The main purpose of this invention's screw mechanism, which allows for quick loosening and locking, is that during use, the screw mechanism can be directly and quickly slid onto the screw rod for engagement. When it is necessary to detach the screw mechanism from the screw rod, the user only needs to rotate the control component to easily and quickly remove the screw mechanism from the screw rod, making the operation convenient and easy.

Another objective of the screw mechanism of this invention, which allows for rapid loosening and locking, is that when the screw mechanism is quickly slid onto the screw, the locking teeth of the engagement block can reliably engage with the external threads of the screw. Furthermore, when the screw mechanism and the screw are separated by external force, the locking teeth of the engagement block will engage with the external threads of the screw with greater force, preventing the screw mechanism and the screw from unintendedly loosening, thus improving stability and practicality.

The following diagrams, in conjunction with the preferred embodiments of the present invention, are provided to enable those skilled in the art to implement the invention based on the description herein.

First, please refer to Figures 1 to 10. The present invention has a screw mechanism that can quickly loosen and lock. The screw mechanism 1 includes: a main body 10, at least one engagement block 20, a control lever 30, a fixing member 40, a reset unit 50, a control member 60, and an elastic member 70.

The main body 10 is cylindrical, with a virtual axis X1 at its center. One end has a through hole 11 along the axial direction, and the other end has a receiving hole 12 along the axial direction. The receiving hole 12 communicates with the through hole 11. The inner wall of the receiving hole 12 has at least one receiving groove 13, and the at least one receiving groove 13 has a guiding inclined surface 131. The guiding inclined surface 131 is closer to the virtual axis X1 at the end near the through hole 11 and further away from the virtual axis X1, forming a shape from near to far. The main body 10 is shaped like an inclined plane and has a baffle 132 that matches the guide inclined plane 131. The baffle 132 has a positioning flange 133 on its inner side. The bottom of the receiving hole 12 has at least one abutment protrusion 14 around the through hole 11. The main body 10 also has two opposing screw holes 15 around its periphery for screwing two rotating parts 16. In this embodiment, the inner wall of the receiving hole 12 has two opposing receiving grooves 13 and the bottom of the receiving hole 12 has two opposing abutment protrusions 14 around the through hole 11.

In this embodiment, the at least one engagement block 20 is two engagement blocks 20, which are installed in the two receiving slots 13 of the main body 10. Each engagement block 20 is provided with a sliding inclined surface 21 that slides on the guide inclined surface 131, and each engagement block 20 is provided with a locking tooth 22 on its inner side.

One end of the control lever 30 passes through the center of the receiving hole 12 in the main body 10. At least one driving groove 31 is provided around the periphery of this end. The driving groove 31 is closer to the end near the through hole 11 and further away from the end far from the through hole 11 and the virtual axis X1, forming a slope from near to far. In this embodiment, two opposing driving grooves are provided. The two drive grooves 31 engage with the two engagement blocks 20. The control lever 30 has a through hole 32 inside, which is connected to the through hole 11 of the main body 10. The control lever 30 has a stepped edge 33 and an annular groove 34 in the middle of its periphery. A C-shaped buckle 35 is assembled on the annular groove 34. The control lever 30 also has an operable operating section 36.

The fastener 40 is located at the middle of the periphery of the control lever 30, and is fixed between the step 33 and the C-shaped buckle 35, and is connected and linked with the control lever 30.

The reset unit 50 is disposed between the fixing member 40 and the two mating blocks 20. It pushes the two mating blocks 20 towards the through hole 11, so that the two mating blocks 20 are stopped by the blocking surface 132 and positioned by the positioning flange 133, preventing the two mating blocks 20 from falling off. It also allows the two mating blocks 20 to be controlled to generate an inner position 20A and an outer position. During the operation between 20B, the two engagement blocks 20 are normally located in the inner position 20A. In this embodiment, the reset unit 50 includes a compression spring 51 and a movable washer 52. The movable washer 52 is disposed between the compression spring 51 and the two engagement blocks 20, so that the movable washer 52 is pushed by the compression spring 51 and contacts the two engagement blocks 20.

The control element 60 is disposed on the operating section 36 of the control lever 30 and is used to rotate the control lever 30 to rotate, thereby driving the two engagement blocks 20 to rotate, so that the two engagement blocks 20 are pushed outward by the two abutting protrusions 14. In this embodiment, the control element 60 is a ring-shaped body, which is sleeved on the control lever 30 and engaged, and is locked and fixed on the control lever 30 by a locking ring 61.

In this embodiment, the elastic element 70 is a torsion spring, which is installed between the fixing member 40 and the control member 60. The two ends of the torsion spring are respectively connected to the fixing member 40 and the control member 60, so that the control member 60 can automatically return to its original state after rotation.

In use, as shown in Figures 11 to 13, no other operation is required. The screw mechanism 1 is quickly slid onto a screw 2. During the sliding process, the locking teeth 22 of the two engagement blocks 20 are pushed by the outer thread 2A of the screw 2 and compressed by the spring-loaded repositioning unit 50, causing the screw mechanism 1 to open in a bouncing manner between the inner position 20A and the outer position 20B. This allows the screw mechanism 1 to slide to the predetermined position of the screw 2. The locking teeth 22 of the two engagement blocks 20 then engage with the outer thread 2A of the screw 2. The screw mechanism 1 is then rotated by the two rotating parts 16, achieving the screw displacement of the screw mechanism 1 on the screw 2. This achieves the effect of the screw mechanism 1 quickly moving to the predetermined position of the screw 2 and engaging. The reset unit 50 axially returns the two engagement blocks 20 to their original position. The sliding inclined surface 21 of the two engagement blocks 20 slides on the guide inclined surface 131, ensuring that the locking teeth 22 of the two engagement blocks 20 can reliably engage with the external thread 2A of the screw 2, thereby improving the stability of the engagement. When the screw mechanism 1 and the screw 2 are separated by external force, the locking teeth 22 of the two engagement blocks 20 will engage with the external thread 2A of the screw 2 with greater force, thereby preventing the screw mechanism 1 and the screw 2 from becoming unexpectedly loose.

Furthermore, as shown in Figures 14 to 16, when it is necessary to separate the screw mechanism 1 from the screw 2, the user only needs to rotate the control member 60 or the operating section 36 to rotate the control lever 30. In turn, the two driving grooves 31 of the control lever 30 drive the two engagement blocks 20 to rotate, so that the two engagement blocks 20 are pushed outward by the two abutting protrusions 14 and displaced from the inner position 20A to the outer position 20B. This causes the locking teeth 22 of the two engagement blocks 20 to separate from the external thread 2A of the screw 2, so that the screw mechanism 1 can be easily and quickly removed from the screw 2.

The following benefits can be obtained from the structure of the above specific embodiments:

1. The present invention provides a screw mechanism that can quickly loosen and lock. In use, the screw mechanism 1 can be directly and quickly slid onto a screw 2, so that the locking teeth 22 of the engagement block 20 engage with the external thread 2A of the screw 2. Then, by rotating the screw mechanism 1, the screw mechanism 1 can be screwed and displaced on the screw 2. When it is necessary to separate the screw mechanism 1 from the screw 2, the user only needs to rotate the control component 60 to separate the locking teeth 22 of the engagement block 20 from the external thread 2A of the screw 2, so that the screw mechanism 1 can be easily and quickly removed from the screw 2. The operation is convenient and easy.

2. The screw mechanism of the present invention can quickly loosen and lock. Its engagement block 20 is axially returned by the reset unit 50. The sliding inclined surface 21 of the engagement block 20 slides on the guide inclined surface 131, so that the locking teeth 22 of the engagement block 20 can reliably engage with the external thread 2A of the screw 2. When the screw mechanism 1 and the screw 2 are separated by external force, the locking teeth 22 of the engagement block 20 will engage with the external thread 2A of the screw 2 with greater force, thereby avoiding the screw mechanism 1 and the screw 2 from unintended loosening, so as to improve stability and practicality.

1: Rotating Mechanism 2: Screw 2A: External Thread 10: Main Body 11: Through Hole 12: Accommodating Hole 13: Receiving Groove 131: Guide Bevel 132: Stop Face 133: Positioning Flange 14: Top Protrusion 15: Screw Hole 16: Turning Component 20: Engaging Block 20A: Inner Position 20B: Outer Position 21: Sliding Bevel 22: Locking Thread 30: Control Rod 31: Drive Groove 32: Through Hole 33: Step Edge 34: Circular Groove 35: C-Type Thread 36: Operating Section 40: Fixing Component 50: Reset Unit 51: Compression Spring 52: Movable Washer 60: Control Component 61: Locking ring; 70: Elastic component; X1: Virtual axis

Figure 1 is a perspective view of the invention. Figure 2 is an exploded perspective view of the invention. Figure 3 is a perspective sectional view of the main body of the invention. Figure 4 is a plan sectional view of the main body of the invention. Figure 5 is a plan view of the invention. Figure 6 is another plan view of the invention. Figure 7 is a sectional view of Figure 5 along line A-A. Figure 8 is a sectional view of Figure 5 along line B-B. Figure 9 is a sectional view of Figure 6 along line C-C. Figure 10 is a sectional view of Figure 6 along line D-D. Figure 11 is a schematic diagram of the quick sliding action of the screw mechanism of the invention on the screw rod. Figure 12 is another schematic diagram of the quick sliding action of the screw mechanism of the invention on the screw rod. Figure 13 is a schematic diagram of the screw rotation displacement action of the screw mechanism of the invention on the screw rod. Figure 14 is a schematic diagram of the action of the rotating control component of the invention quickly removing the screw mechanism from the screw rod. Figure 15 is a schematic diagram of the action of the rotating control component of the present invention to separate the locking teeth of the engagement block from the external threads of the screw. Figure 16 is a schematic diagram of the action of the rotating control component of the present invention to displace the engagement block by the pushing protrusion outward.

1: Screw Rotation Mechanism

10: Subject

11: Perforation

12: Receiving Hole

13: Container

14: Press against the convex part

15: Screw hole

16: Turning component

20: 嚙合哊

21: Sliding Inclined Plane

22: Cavity tooth

30: Control lever

31: Drive groove

32: Through hole

33: The Edge of the Stairs

34: Circular groove

35: C-shaped buckle

40: Fasteners

50: Reset Unit

51: Compression Spring

52: Activity mat

60: Control components

61:Lock ring

70: Elastic component

Claims (24)

A screw mechanism for quick loosening and locking includes: a main body (10) with a virtual axis (X1) at its center, a through hole (11) at one end, and a receiving hole (12) at the other end, the receiving hole (12) communicating with the through hole (11), the inner wall of the receiving hole (12) having at least one receiving groove (13), and the at least one receiving groove (13) having a guide slope (131). The guide ramp (131) is closer to the end of the through hole (11) and the virtual axis (X1) at a relatively large vertical distance, while the end of the through hole (11) and the virtual axis (X1) at a relatively large vertical distance are formed from near to far. The bottom of the receiving hole (12) is provided with at least one top protrusion (14) around the through hole (11); at least one latching block (20) is installed in at least one receiving groove (13) of the main body (10). The at least one latching block (20) is provided with a sliding ramp (21) that slides on the guide ramp (131), and a locking tooth (22) is provided on the inner side. A control lever (30) has one end inserted into the center of the receiving hole (12) of the main body (10). At least one driving groove (31) is provided around the periphery of this end. The driving groove (31) is closer to the virtual axis (X1) at the end near the through hole (11) and further away from the virtual axis (X1) at the end farthest from the through hole (11), forming a slope from near to far. The at least one driving groove (31) engages with at least one engaging block (20). A through hole (32) is provided inside the control lever (30), and the through hole (32) communicates with the through hole (11) of the main body (10). The control lever (30) also has an operable operating section (36). A reset unit (50) is used to push the at least one bite block (20) toward the perforation (11); The movement of the at least one engagement block (20) between the inner position (20A) and the outer position (20B) is normally achieved by the reset unit (50) axially returning the at least one engagement block (20) to its original position. The sliding ramp (21) of the at least one engagement block (20) slides on the guide ramp (131), so that the at least one engagement block (20) is in the inner position (20A). The at least one drive groove (31) of the control lever (30) drives the at least one engagement block (20) to rotate, so that the at least one engagement block (20) is pushed outward by the push protrusion (14). By operating the operation segment (36), the engagement block (20) can be controlled to move between the inner position (20A) and the outer position (20B) in conjunction with the guide ramp (131) and the drive groove (31). The screw mechanism that can be quickly loosened and locked as described in claim 1, wherein the body (10) is provided with two opposing screw holes (15) on its periphery for screwing two rotating parts (16). The screw mechanism for quick release and locking as described in claim 1 further includes a fixing member (40) disposed at the middle section of the periphery of the control lever (30), and a reset unit (50) disposed between the fixing member (40) and the at least one engagement block (20). The middle section of the periphery of the control lever (30) is provided with a stepped edge (33) and an annular groove (34), and a C-shaped buckle (35) is provided on the annular groove (34). The fixing member (40) is fixed between the stepped edge (33) and the C-shaped buckle (35) and is engaged and linked with the control lever (30). The screw mechanism for quick release and locking as described in claim 1, wherein the reset unit (50) includes a compression spring (51) and a movable washer (52), the movable washer (52) being disposed between the compression spring (51) and the at least one engagement block (20), such that the movable washer (52) is abutted by the compression spring (51) and contacts the at least one engagement block (20). The screw mechanism that can be quickly loosened and locked as described in claim 1 further includes a control element (60) disposed on the operating section (36) of the control lever (30) for driving the control lever (30) to rotate. The control element (60) is a ring-shaped body that is fitted onto the control lever (30) and engaged with a locking ring (61) screwed onto the control lever (30) for locking and fixing. The screw mechanism for quick release and locking as described in claim 5 further includes an elastic element (70), which is a torsion spring installed between the fixing element (40) and the control element (60). The two ends of the torsion spring are respectively connected to the fixing element (40) and the control element (60), so that the control element (60) can automatically return to its original state after rotation. As described in claim 1, the screw mechanism that can be quickly released and locked, wherein the main body (10) is provided with a stop surface (132) in conjunction with the guide ramp (131), and when the engagement block (20) is pushed in the direction of the through hole (11), the engagement block (20) is blocked by the stop surface (132). As described in claim 7, a screw mechanism that can be quickly released and locked, wherein a positioning flange (133) is provided on the inner side of the stop (132), and the at least one bite block (20) is blocked by the stop (132) and positioned by the positioning flange (133). A screw mechanism that can quickly loosen and lock includes: a main body (10) with a virtual axis (X1) at the center, a through hole (11) at one end and a receiving hole (12) at the other end, the receiving hole (12) communicating with the through hole (11), the inner wall of the receiving hole (12) having at least one receiving groove (13), the at least one receiving groove (13) having a guide slope (131), the guide slope (131) being closer to the end of the through hole (11) and perpendicularly closer to the virtual axis (X1), and farther away from the end of the through hole (11) and perpendicularly farther from the virtual axis (X1), so as to form a slope shape from near to far; At least one latch (20) is installed in at least one groove (13) of the main body (10). The at least one latch (20) is provided with a sliding inclined surface (21) that slides on the guide inclined surface (131) and a locking tooth (22) is provided on the inner side. A control lever (30) has one end inserted into the center of the receiving hole (12) of the main body (10). At least one driving groove (31) is provided around the periphery of this end. The driving groove (31) is closer to the virtual axis (X1) at the end near the through hole (11) and further away from the virtual axis (X1) at the end farthest from the through hole (11), forming a slope from near to far. The at least one driving groove (31) engages with at least one engaging block (20). A through hole (32) is provided inside the control lever (30), and the through hole (32) communicates with the through hole (11) of the main body (10). The control lever (30) also has an operable operating section (36). A reset unit (50) is used to push the at least one engagement block (20) towards the through hole (11); the main body (10) is provided with a stop surface (132) in conjunction with the guide ramp (131), so that the engagement block (20) is blocked by the stop surface (132) when the engagement block (20) is pushed towards the through hole (11); by operating the operation section (36), the engagement block (20) in conjunction with the guide ramp (131) and the drive groove (31) can be controlled to generate the movement between the inner position (20A) and the outer position (20B). The screw mechanism for quick release and locking as described in claim 9, wherein the body (10) has two opposing screw holes (15) around its periphery for screwing two rotating parts (16). The screw mechanism for quick release and locking as described in claim 9 further includes a fixing member (40) disposed at the middle section of the periphery of the control lever (30), and a reset unit (50) disposed between the fixing member (40) and the at least one engagement block (20). The middle section of the periphery of the control lever (30) is provided with a stepped edge (33) and an annular groove (34), and a C-shaped buckle (35) is provided on the annular groove (34). The fixing member (40) is fixed between the stepped edge (33) and the C-shaped buckle (35) and is engaged and linked with the control lever (30). As described in claim 9, the screw mechanism that can be quickly released and locked includes a positioning flange (133) on the inner side of the block (132), at least one abutment protrusion (14) at the bottom of the receiving hole (12), and the at least one latching block (20) being blocked by the block (132) and positioned by the positioning flange (133). As described in claim 12, the screw mechanism that can be quickly released and locked, wherein the movement of the at least one engagement block (20) between the inner position (20A) and the outer position (20B), normally allows the at least one engagement block (20) to be axially returned to its original position by the reset unit (50), and the sliding ramp (21) of the at least one engagement block (20) is aligned with the guide ramp (13). 1) Slide upwards to position the at least one engagement block (20) in the inner position (20A), and rotate the at least one drive groove (31) of the control lever (30) to drive the at least one engagement block (20) to rotate, so that the at least one engagement block (20) is pushed outwards by the at least one push protrusion (14) and moved from the inner position (20A) to the outer position (20B). The screw mechanism for quick release and locking as described in claim 9, wherein the reset unit (50) includes a compression spring (51) and a movable washer (52), the movable washer (52) being disposed between the compression spring (51) and the at least one engagement block (20), such that the movable washer (52) is abutted by the compression spring (51) and contacts the at least one engagement block (20). The screw mechanism for quick release and locking as described in claim 12 further includes: a control member (60) disposed on the operating section (36) of the control lever (30) for driving the control lever (30) to rotate, thereby driving the at least one engagement block (20) to rotate, so that the at least one engagement block (20) is displaced outward by the pushing protrusion (14). The control member (60) is an annular body that is fitted onto the control lever (30) and engaged with a locking ring (61) screwed onto the control lever (30) for locking and fixing. The screw mechanism for quick release and locking as described in claim 15 further includes an elastic element (70), which is a torsion spring installed between the fixing element (40) and the control element (60). The two ends of the torsion spring are respectively connected to the fixing element (40) and the control element (60), so that the control element (60) can automatically return to its original state after rotation. A screw mechanism that can quickly loosen and lock includes: a main body (10) with a virtual axis (X1) at the center, a through hole (11) at one end and a receiving hole (12) at the other end, the receiving hole (12) communicating with the through hole (11), the inner wall of the receiving hole (12) having at least one receiving groove (13), the at least one receiving groove (13) having a guide slope (131), the guide slope (131) being closer to the end of the through hole (11) and perpendicularly closer to the virtual axis (X1), and farther away from the end of the through hole (11) and perpendicularly farther from the virtual axis (X1), so as to form a slope shape from near to far; At least one latch (20) is installed in at least one groove (13) of the main body (10). The at least one latch (20) is provided with a sliding inclined surface (21) that slides on the guide inclined surface (131) and a locking tooth (22) is provided on the inner side. A control lever (30) has one end inserted into the center of the receiving hole (12) of the main body (10). At least one driving groove (31) is provided around the periphery of the end. The driving groove (31) is closer to the virtual axis (X1) at the end near the through hole (11) and farther away from the virtual axis (X1) at the end far away, forming an inclined surface from near to far. The at least one driving groove (31) engages with the at least one latching block (20). The control lever (30) has a through hole (32) inside, which is connected to the through hole (11) of the main body (10). The control lever (30) also has an operable operating section (36). A reset unit (50) is used to push the at least one engagement block (20) toward the through hole (11); and a control member (60) is disposed on the operating section (36) of the control lever (30) to drive the control lever (30) to rotate, thereby driving the at least one engagement block (20) to rotate; by operating the control member (60) and the operating section (36), the engagement block (20) can be controlled to cooperate with the guide ramp (131) and the drive groove (31) to control the movement between the inner position (20A) and the outer position (20B). The screw mechanism for quick release and locking as described in claim 17, wherein the body (10) is provided with two opposing screw holes (15) around its periphery for screwing two rotating parts (16). The screw mechanism for quick release and locking as described in claim 17 further includes a fixing member (40) disposed at the middle section of the periphery of the control lever (30), and a reset unit (50) disposed between the fixing member (40) and the at least one engagement block (20). The middle section of the periphery of the control lever (30) is provided with a stepped edge (33) and an annular groove (34), and a C-shaped buckle (35) is provided on the annular groove (34). The fixing member (40) is fixed between the stepped edge (33) and the C-shaped buckle (35) and is engaged and linked with the control lever (30). The screw mechanism for quick release and locking as described in claim 17, wherein the reset unit (50) includes a compression spring (51) and a movable washer (52) disposed between the compression spring (51) and the at least one engagement block (20), such that the movable washer (52) is abutted by the compression spring (51) and contacts the at least one engagement block (20). As described in claim 17, the screw mechanism that can be quickly released and locked, wherein the control element (60) is a ring-shaped body that is fitted onto the control rod (30) and engaged with a locking ring (61) screwed onto the control rod (30) for locking and fixing. The screw mechanism for quick release and locking as described in claim 19 further includes an elastic element (70), which is a torsion spring installed between the fixing element (40) and the control element (60). The two ends of the torsion spring are respectively connected to the fixing element (40) and the control element (60), so that the control element (60) can automatically return to its original state after rotation. As described in claim 17, the screw mechanism that can be quickly released and locked, wherein the main body (10) is provided with a stop surface (132) in conjunction with the guide ramp (131), and when the engagement block (20) is pushed toward the through hole (11), the engagement block (20) is blocked by the stop surface (132). The screw mechanism for quick release and locking as described in claim 17, wherein the bottom of the receiving hole (12) is provided with at least one abutting protrusion (14), and the at least one bite block (20) is displaced outward by the abutting protrusion (14).