阅读说明：本技术 一种防松紧固组件 (Anti-loosening fastening assembly ) 是由 张雪燕 于 2020-05-05 设计创作，主要内容包括：本发明提供了一种防松紧固组件,属于机械紧固件领域。它解决了现有紧固件防松效果差的问题。本防松紧固组件,包括螺栓和螺帽,还包括防松垫,防松垫纵截面为直角三角形结构；螺帽上设有挤压机构,挤压机构包括位于螺帽底端内壁的挤压槽,挤压槽槽壁设有伸缩槽,伸缩槽内设有伸缩柱和压缩弹簧,挤压槽内设有挤压套,挤压套外壁设有旋转槽,旋转槽内侧槽壁沿旋转槽周向呈锯齿结构,挤压机构还包括与挤压套同轴设置的圆环形板状挤压板,挤压板底面为圆环形斜面结构,且挤压板内沿与挤压套底端固定,挤压槽槽壁和挤压套外壁为光滑面,挤压板底面和防松垫顶面为粗糙面。本紧固组件能进一步提高防松效果。(The invention provides an anti-loose fastening assembly, and belongs to the field of mechanical fasteners. It has solved the poor problem of current locking effect of fastener. The anti-loosening fastening assembly comprises a bolt, a nut and an anti-loosening pad, wherein the longitudinal section of the anti-loosening pad is of a right-angled triangle structure; be equipped with extrusion mechanism on the nut, extrusion mechanism is including the extrusion groove that is located nut bottom inner wall, the extrusion groove cell wall is equipped with flexible groove, flexible inslot is equipped with flexible post and compression spring, be equipped with the extrusion cover in the extrusion groove, the extrusion cover outer wall is equipped with the swivelling chute, the inboard cell wall of swivelling chute is the sawtooth structure along swivelling chute circumference, extrusion mechanism still includes the annular platelike stripper plate of the coaxial setting with the extrusion cover, the stripper plate bottom surface is annular inclined plane structure, and fixed with the extrusion cover bottom along in the stripper plate, extrusion groove cell wall and extrusion cover outer wall are the smooth surface, stripper plate bottom surface and locking pad top surface are rough surface. This fastening components can further improve locking effect.)

1. The utility model provides an anti-loosening fastening assembly, includes bolt (1) that is equipped with the external screw thread and is equipped with internal screw thread hexagon nut (2), still includes the ring shape rubber locking pad (4) that the internal diameter is greater than nut (2) internal diameter, its characterized in that: the longitudinal section of the anti-loosening pad (4) is of a right-angled triangle structure, the included angle between the inner side surface of the anti-loosening pad (4) and the bottom surface of the anti-loosening pad (4) is a right angle, and the top surface of the anti-loosening pad (4) is a circular inclined surface; the nut (2) on be equipped with extrusion mechanism, extrusion mechanism includes the round cover form extrusion groove (21) that is located nut (2) bottom inner wall and coaxial setting with nut (2), extrusion groove (21) cell wall is equipped with a plurality of flexible grooves (22), flexible groove (22) degree of depth direction radially sets up along nut (2), flexible groove (22) fit in is equipped with flexible post (23) and compression spring (24) that both ends offset with flexible post (23) and flexible groove (22) respectively, extrusion groove (21) fit in is equipped with round cover form extrusion cover (3), extrusion cover (3) internal diameter is greater than nut (2) internal diameter, extrusion cover (3) outer wall coaxial is equipped with round ring shape swivelling chute (31), the inboard cell wall in swivelling chute (31) is the sawtooth structure along swivelling chute (31) circumference, and including the tight face of screwing up (32) and the loose face of screwing up (33) that links up in proper order, the loose face of screwing up (33) inclination is greater than tight face of screwing up (32) inclination, the screwing surface (32) and the unscrewing surface (33) are respectively positioned on one side of the screwing direction and the unscrewing direction of the nut (2), a stable groove (34) is formed at the intersection of the screwing surface (32) and the unscrewing surface (33), the compression spring (24) pushes the telescopic column (23) to enable the telescopic column (23) to be clamped between the upper side groove wall and the lower side groove wall of the rotary groove (31), the end part of the telescopic column (23) is positioned in the stable groove (34), the extrusion mechanism further comprises a circular-ring-shaped plate-shaped extrusion plate (35) which is coaxially arranged with the extrusion sleeve (3), the bottom surface of the extrusion plate (35) is of a circular-ring-shaped inclined-surface structure, the inner edge of the extrusion plate (35) is coaxially fixed with the bottom end of the extrusion sleeve (3), the groove wall of the extrusion groove (21) and the outer wall of the extrusion sleeve (3) are smooth surfaces which are mutually matched, and the bottom surface of the extrusion plate (;

the bolt (1) sequentially penetrates through the connected piece and the anti-loosening pad (4) and is in threaded connection with the nut (2), the bottom surface of the extrusion plate (35) abuts against the top surface of the anti-loosening pad (4), the bottom surface of the anti-loosening pad (4) abuts against the connected piece, and the anti-loosening pad (4) is pressed between the extrusion plate (35) and the connected piece;

the nut (2) can be rotated towards the screwing direction, so that the nut (2) and the extrusion sleeve (3) relatively rotate, the end part of the telescopic column (23) slides on the screwing surface (32) and enters the adjacent stable groove (34), the extrusion plate (35) moves towards the anti-loosening pad (4), the bottom surface of the anti-loosening pad (4) extrudes the connected piece, and the inner side surface of the anti-loosening pad (4) radially expands and extrudes the bolt (1);

the nut (2) can also be rotated towards the unscrewing direction, so that the nut (2) and the extrusion sleeve (3) relatively rotate, the end part of the telescopic column (23) slides on the unscrewing surface (33) and enters the adjacent stabilizing groove (34), the extrusion plate (35) reversely moves the anti-loosening pad (4), the bottom surface of the anti-loosening pad (4) is loosened from the connected piece, and the inner side surface of the anti-loosening pad (4) radially shrinks and loosens the bolt (1).

2. An anti-loosening fastening assembly according to claim 1, wherein: the locking pad (4) top surface be equipped with a plurality of locating pieces (41), and stripper plate (35) bottom surface is equipped with a plurality of constant head tanks (36), constant head tank (36) are length direction along the bar structure that stripper plate (35) bottom surface incline direction set up, and a plurality of locating pieces (41) slide block in proper order in a plurality of constant head tanks (36).

3. An anti-loosening fastening assembly according to claim 2, wherein: the anti-loosening pad (4) is of a closed hollow air bag structure.

4. A loose-proof fastening assembly as claimed in claim 3, wherein: the bottom surface of the anti-loosening pad (4) is provided with a plurality of anti-slip strips (42), and the anti-slip strips (42) are arranged along the radial direction of the anti-loosening pad (4) in the length direction.

5. An anti-loosening fastening assembly according to claim 4, wherein: the extrusion mechanism still include annular plate-shaped baffle (37) and shell form spacer sleeve (25), fixed along with stripper plate (35) outer edge in baffle (37), spacer sleeve (25) top and nut (2) bottom coaxial fastening, spacer sleeve (25) bottom is the sharp column structure of ring shape to support and be close to outer edge position at baffle (37) top surface, spacer sleeve (25) outer wall be the regular hexagon structure of lining up with nut (2) outer wall.

6. An anti-loosening fastening assembly according to claim 5, wherein: the included angle between the top surface and the bottom surface of the anti-loosening pad (4) is an acute angle.

7. An anti-loosening fastening assembly according to claim 6, wherein: the outer wall of the top end of the extrusion sleeve (3) is provided with a guide part (38) with a circular inclined plane structure, and the guide part (38) extrudes the telescopic column (23) to enable the telescopic column (23) to enter the rotary groove (31).

8. An anti-loosening fastening assembly according to claim 7, wherein: the extrusion sleeve (3), the extrusion plate (35) and the baffle (37) are of an integral structure, and the screw cap (2) and the retaining sleeve (25) are of an integral structure.

Technical Field

The invention belongs to the technical field of mechanical fasteners, and relates to an anti-loose fastening assembly.

Background

The connection of utilizing the fastener to be used for mechanical device is common connected mode, generally including bolt and the nut of mutual spiro union, because its easy dismounting, simple structure, widely used in mechanical equipment, lead to connecting not hard up in order to prevent mechanical vibration, the most common way is to sheathe the gasket on the bolt, make the gasket press from both sides tightly between the nut and by the connecting piece, thereby utilize the gasket axial expansion to reset and improve the screw thread frictional force between bolt and the nut, thereby realize locking effect, nevertheless utilize the locking defect that has of gasket:

1. although the friction force between the threads can be improved, the threads between the nut and the bolt still loosen slowly under frequent vibration, and complete looseness prevention cannot be realized;

2. the more the screw cap is screwed, the better the anti-loosening effect is, but the more difficulty in disassembling the screw cap is caused, and the influence on the disassembly is caused;

3. when the nut is screwed or unscrewed on the bolt, the gasket can rotate relative to the connected piece, so that the contact part of the connected piece and the gasket leaves marks, and the attractiveness of the connected piece is influenced.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an anti-loose fastening assembly which can further improve the anti-loose effect, cannot influence normal disassembly and assembly and cannot damage the appearance of a connected piece.

The purpose of the invention can be realized by the following technical scheme: the utility model provides an anti-loosening fastening assembly, includes the bolt that is equipped with the external screw thread and is equipped with internal screw thread hexagon nut, still includes the ring shape rubber locking pad that the internal diameter is greater than the nut internal diameter, its characterized in that: the longitudinal section of the anti-loosening pad is of a right-angled triangle structure, the included angle between the inner side surface of the anti-loosening pad and the bottom surface of the anti-loosening pad is a right angle, and the top surface of the anti-loosening pad is an annular inclined surface; the nut is provided with an extrusion mechanism, the extrusion mechanism comprises a round sleeve-shaped extrusion groove which is positioned on the inner wall of the bottom end of the nut and is coaxially arranged with the nut, the groove wall of the extrusion groove is provided with a plurality of telescopic grooves, the depth direction of the telescopic grooves is arranged along the radial direction of the nut, the telescopic grooves are internally provided with telescopic columns and compression springs with two ends respectively abutting against the telescopic columns and the telescopic grooves in a matching way, the extrusion groove is internally provided with a round sleeve-shaped extrusion sleeve in a matching way, the inner diameter of the extrusion sleeve is larger than the inner diameter of the nut, the outer wall of the extrusion sleeve is coaxially provided with a circle of annular rotary groove, the inner side groove wall of the rotary groove is of a sawtooth structure along the circumferential direction of the rotary groove and comprises a screwing surface and a unscrewing surface which are sequentially connected, the inclination angle of the unscrewing surface is larger than that of the screwing surface, the screwing surface and the unscrewing surface are respectively positioned on one side of the screwing direction and the unscrewing, the bottom surface of the extrusion plate is of a circular inclined plane structure, the inner edge of the extrusion plate is coaxially fixed with the bottom end of the extrusion sleeve, the wall of the extrusion groove and the outer wall of the extrusion sleeve are smooth surfaces, and the bottom surface of the extrusion plate and the top surface of the anti-loosening pad are rough surfaces;

the bolt sequentially penetrates through the connected piece and the anti-loosening pad and is in threaded connection with the nut, the bottom surface of the extrusion plate abuts against the top surface of the anti-loosening pad, the bottom surface of the anti-loosening pad abuts against the connected piece, and the anti-loosening pad is pressed between the extrusion plate and the connected piece;

the nut can be rotated towards the screwing direction, so that the nut and the extrusion sleeve rotate relatively, the end part of the telescopic column slides on the screwing surface and enters the adjacent stable groove, the extrusion plate moves towards the anti-loosening pad, the bottom surface of the anti-loosening pad extrudes the connected piece, and the inner side surface of the anti-loosening pad expands radially and extrudes the bolt;

the nut can also be rotated towards the unscrewing direction, so that the nut and the extrusion sleeve rotate relatively, the end part of the telescopic column slides on the unscrewing surface and enters the adjacent stable groove, the extrusion plate moves in the reverse direction, the bottom surface of the anti-loosening pad is loosened from the connected piece, and the inner side surface of the anti-loosening pad contracts in the radial direction and loosens the bolt.

After the nut is screwed, the anti-loosening pad can be used for expanding axially to improve the thread friction force between the bolt and the nut, and the bolt can be extruded through radial expansion of the inner side surface of the anti-loosening pad, so that the nut, the connected piece and the bolt form an integral relatively stable structure, and the anti-loosening effect is improved; the nut can only axially press the anti-loosening pad by screwing, so that the anti-loosening pad axially extrudes the connected piece to avoid the trace caused by the friction of the anti-loosening pad on the connected piece, and the surface of the connected piece is more attractive; the inclination angle of the unscrewing surface is larger than that of the screwing surface, so that the force applied towards the unscrewing direction can be relatively rotated between the nut and the extrusion sleeve only by being larger than the resistance force applied by the end part of the telescopic column in sliding on the unscrewing surface, and the force applied when the nut is unscrewed cannot be influenced by the friction force of the anti-loosening pad, so that the disassembling difficulty can be reduced; the fastening assembly is used as a common fastener, and can be quickly installed only by sequentially penetrating a bolt through a connected piece and a locking pad, screwing the bolt with a nut and screwing the nut in place, and can be quickly disassembled by unscrewing the nut in place, so that the assembly and disassembly are more convenient; the bolt of the fastening assembly is of a common bolt structure, and only the nut structure is improved, so that the fastening assembly can be matched with the common bolt for use, and the universality is better.

In the locking fastening component, the top surface of the locking pad is provided with a plurality of positioning blocks, the bottom surface of the extrusion plate is provided with a plurality of positioning grooves, the positioning grooves are of strip-shaped structures arranged along the inclined direction of the bottom surface of the extrusion plate in the length direction, and the positioning blocks are sequentially clamped in the positioning grooves in a sliding manner.

The positioning block and the positioning groove are used for positioning, and the extrusion plate and the anti-loosening pad can be circumferentially and relatively fixed in the process of rotating the screw cap.

In the above anti-loose fastening assembly, the anti-loose pad is of a closed hollow air bag structure.

In the anti-loosening fastening assembly, the bottom surface of the anti-loosening pad is provided with a plurality of anti-slip strips, and the anti-slip strips are arranged along the radial direction of the anti-loosening pad in the length direction.

Therefore, the friction force between the anti-loosening pad and the extrusion plate, between the anti-loosening pad and the bolt can be further improved, and the anti-loosening effect is improved.

In foretell locking fastening components, extrusion mechanism still include annular plate-like baffle of circle and shell form spacer sleeve, the baffle is interior along fixed with the stripper plate outer edge, the spacer sleeve top is coaxial fixed with the nut bottom, the spacer sleeve bottom is the sharp column structure of circle to support and be close to outer edge position at the baffle top surface, the spacer sleeve outer wall be the regular hexagon structure of aliging with the nut outer wall.

The bottom end of the blocking sleeve is utilized to form a supporting structure for the baffle, so that the deformation of the extrusion plate is avoided, and meanwhile, the contact area between the blocking sleeve and the baffle is reduced, so that the friction force applied to the nut in the rotating process is reduced.

In the above anti-loose fastening assembly, an included angle between the top surface and the bottom surface of the anti-loose pad is an acute angle.

In the anti-loosening fastening assembly, the outer wall of the top end of the extrusion sleeve is provided with the guide part of the annular inclined plane structure, and the guide part extrudes the telescopic column to enable the telescopic column to enter the rotary groove.

Therefore, the manufacture and installation are convenient.

In the anti-loose fastening assembly, the extrusion sleeve, the extrusion plate and the baffle are of an integrated structure, and the nut and the retaining sleeve are of an integrated structure.

The structure is more stable.

Compared with the prior art, the invention has the following advantages:

1. after the nut is screwed, the anti-loosening pad can be used for expanding axially to improve the thread friction force between the bolt and the nut, and the bolt can be extruded through radial expansion of the inner side surface of the anti-loosening pad, so that the nut, the connected piece and the bolt form an integral relatively stable structure, and the anti-loosening effect is improved;

2. the nut can only axially press the anti-loosening pad by screwing, so that the anti-loosening pad axially extrudes the connected piece to avoid the trace caused by the friction of the anti-loosening pad on the connected piece, and the surface of the connected piece is more attractive;

3. the inclination angle of the unscrewing surface is larger than that of the screwing surface, so that the force applied towards the unscrewing direction can be relatively rotated between the nut and the extrusion sleeve only by being larger than the resistance force applied by the end part of the telescopic column in sliding on the unscrewing surface, and the force applied when the nut is unscrewed cannot be influenced by the friction force of the anti-loosening pad, so that the disassembling difficulty can be reduced;

4. the fastening assembly is used as a common fastener, and can be quickly installed only by sequentially penetrating a bolt through a connected piece and a locking pad, screwing the bolt with a nut and screwing the nut in place, and can be quickly disassembled by unscrewing the nut in place, so that the assembly and disassembly are more convenient;

5. the bolt of the fastening assembly is of a common bolt structure, and only the nut structure is improved, so that the fastening assembly can be matched with the common bolt for use, and the universality is better.

Drawings

FIG. 1 is a front view and partial cross-sectional view of the present fastener assembly;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a transverse cross-sectional view of the present fastener assembly;

fig. 4 is a partially enlarged view of fig. 3.

In the figure, the position of the upper end of the main shaft,

1. a bolt;

2. a nut; 21. extruding a groove; 22. a telescopic groove; 23. a telescopic column; 24. a compression spring; 25. a blocking sleeve;

3. extruding a sleeve; 31. a rotating tank; 32. screwing the noodles tightly; 33. loosening the noodles; 34. a stabilizing slot; 35. a pressing plate; 36. positioning a groove; 37. a baffle plate; 38. a guide portion;

4. a locking pad; 41. positioning blocks; 42. and (4) an anti-slip strip.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1-4, the anti-loose fastening assembly of the present invention comprises a bolt 1 with external threads, a hexagon nut 2 with internal threads, and a circular rubber anti-loose pad 4 with an internal diameter larger than that of the nut 2, wherein the longitudinal section of the anti-loose pad 4 is a right-angled triangle structure, an included angle between the inner side surface of the anti-loose pad 4 and the bottom surface of the anti-loose pad 4 is a right angle, and the top surface of the anti-loose pad 4 is a circular inclined surface; the nut 2 is provided with an extruding mechanism, the extruding mechanism comprises a round sleeve-shaped extruding groove 21 which is positioned on the inner wall of the bottom end of the nut 2 and is coaxially arranged with the nut 2, the groove wall of the extruding groove 21 is provided with a plurality of telescopic grooves 22, the depth direction of the telescopic grooves 22 is arranged along the radial direction of the nut 2, the telescopic grooves 22 are internally provided with a telescopic column 23 and a compression spring 24 with two ends respectively butted against the telescopic column 23 and the telescopic grooves 22 in a matching way, the extruding groove 21 is internally provided with a round sleeve-shaped extruding sleeve 3 in a matching way, the inner diameter of the extruding sleeve 3 is larger than the inner diameter of the nut 2, the outer wall of the extruding sleeve 3 is coaxially provided with a circle of annular rotary groove 31, the inner side groove wall of the rotary groove 31 is of a sawtooth structure along the circumferential direction of the rotary groove 31 and comprises a screwing surface 32 and an unscrewing surface 33 which are sequentially connected, the inclination angle of the unscrewing surface 33 is larger than that of the screwing surface 32, the compression spring 24 pushes the telescopic column 23 to enable the telescopic column 23 to be clamped between the upper side groove wall and the lower side groove wall of the rotary groove 31, the end part of the telescopic column 23 is located in the stabilizing groove 34, the extruding mechanism further comprises a circular annular plate-shaped extruding plate 35 which is coaxially arranged with the extruding sleeve 3, the bottom surface of the extruding plate 35 is of a circular annular inclined surface structure, the inner edge of the extruding plate 35 is coaxially fixed with the bottom end of the extruding sleeve 3, the groove wall of the extruding groove 21 and the outer wall of the extruding sleeve 3 are smooth surfaces, and the bottom surface of the extruding plate 35 and the top surface of the anti;

the bolt 1 sequentially penetrates through the connected piece and the anti-loosening pad 4 and is in threaded connection with the nut 2, the bottom surface of the extrusion plate 35 abuts against the top surface of the anti-loosening pad 4, the bottom surface of the anti-loosening pad 4 abuts against the connected piece, and the anti-loosening pad 4 is pressed between the extrusion plate 35 and the connected piece;

the nut 2 can be rotated towards the screwing direction, so that the nut 2 and the extrusion sleeve 3 rotate relatively, the end part of the telescopic column 23 slides on the screwing surface 32 and enters the adjacent stable groove 34, the extrusion plate 35 moves towards the anti-loosening pad 4, the bottom surface of the anti-loosening pad 4 extrudes a connected piece, the inner side surface of the anti-loosening pad 4 expands radially and extrudes the bolt 1;

the nut 2 can also be rotated towards the unscrewing direction, so that the nut 2 and the extrusion sleeve 3 rotate relatively, the end part of the telescopic column 23 slides on the unscrewing surface 33 and enters the adjacent stabilizing groove 34, the extrusion plate 35 moves in the opposite direction of the anti-loosening pad 4, the bottom surface of the anti-loosening pad 4 is loosened from a connected piece, and the inner side surface of the anti-loosening pad 4 is radially contracted and the bolt 1 is loosened.

Further, the top surface of the anti-loosening pad 4 is provided with a plurality of positioning blocks 41, the bottom surface of the extrusion plate 35 is provided with a plurality of positioning grooves 36, the positioning grooves 36 are bar-shaped structures arranged along the inclined direction of the bottom surface of the extrusion plate 35 in the length direction, and the positioning blocks 41 are sequentially clamped in the positioning grooves 36 in a sliding manner. The anti-loosening pad 4 is of a closed hollow air bag structure. The bottom surface of the anti-loosening pad 4 is provided with a plurality of anti-slip strips 42, and the anti-slip strips 42 are arranged along the radial direction of the anti-loosening pad 4 in the length direction. The extrusion mechanism further comprises a circular plate-shaped baffle 37 and a sleeve-shaped baffle sleeve 25, the inner edge of the baffle 37 is fixed with the outer edge of the extrusion plate 35, the top end of the baffle sleeve 25 is coaxially fixed with the bottom end of the screw cap 2, the bottom end of the baffle sleeve 25 is of a circular-ring-shaped pointed structure and abuts against the top surface of the baffle 37 and is close to the outer edge, and the outer wall of the baffle sleeve 25 is of a regular hexagon structure aligned with the outer wall of the screw cap 2. The included angle between the top surface and the bottom surface of the anti-loosening pad 4 is an acute angle. The outer wall of the top end of the extrusion sleeve 3 is provided with a guide part 38 with a circular ring inclined plane structure, and the guide part 38 extrudes the telescopic column 23 to enable the telescopic column 23 to enter the rotating groove 31. The extrusion sleeve 3, the extrusion plate 35 and the baffle 37 are of an integrated structure, and the screw cap 2 and the retaining sleeve 25 are of an integrated structure.

The specific principle is as follows: the bolt 1 sequentially penetrates through the connected piece and the anti-loose pad 4 and is in threaded connection with the nut 2, the nut 2 is rotated towards the screwing direction, when the friction force between the anti-loose pad 4 and the extrusion plate 35 and the connected piece is larger than the resistance force which is applied to the end part of the telescopic column 23 in a sliding mode on the screwing surface 32, the anti-loose pad 4, the extrusion plate 35 and the connected piece are relatively fixed, then the nut 2 and the extrusion sleeve 3 are relatively rotated by screwing the nut 2, the end part of the telescopic column 23 slides on the screwing surface 32 and enters the adjacent stabilizing groove 34, therefore, the extrusion plate 35 axially presses the anti-loose pad 4 downwards, the bottom surface of the anti-loose pad 4 extrudes the connected piece, the bolt 1 is extruded by the inner side surface of the anti-loose pad 4 until the anti-loose pad 4 is completely pressed between the extrusion plate 35, the connected piece and the bolt 1, and the extrusion plate 35, the connected piece and the bolt 1 form a stable integral structure by utilizing the anti, and the nut 2 rotates relative to the extrusion sleeve 3 in the screwing process, so that the nut 2 does not rub the anti-loosening pad 4 in the screwing process, the axial pressure of the anti-loosening pad 4 is further improved, and the anti-loosening pad 4 is expanded and reset to improve the thread friction force between the bolt 1 and the nut 2, so that the anti-loosening effect is improved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms bolt 1, nut 2, pressing groove 21, telescopic groove 22, telescopic post 23, compression spring 24, collar 25, pressing sleeve 3, rotation groove 31, tightening surface 32, loosening surface 33, stabilizing groove 34, pressing plate 35, positioning groove 36, baffle 37, guide 38, anti-loosening pad 4, positioning block 41, anti-slip strip 42, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.