CN212803902U

CN212803902U - Anti-back screw

Info

Publication number: CN212803902U
Application number: CN202020763716.8U
Authority: CN
Inventors: 秦明
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2021-03-26
Anticipated expiration: 2030-05-11

Abstract

The utility model relates to a prevent moving back screw. The anti-back screw comprises a main screw part and an eccentric part, and is characterized in that the main screw part is provided with an eccentric hole in the direction of a long longitudinal axis; the eccentric part passes through the eccentric hole; the eccentric portion has head cap structure at the head end, head cap and eccentric portion are eccentric connection, the eccentric portion has second tail cap structure at the tail end. This prevent moving back screw locks main nail portion through the partial skew of eccentric part and simultaneously through the cooperation of second tail cap structure, prevents moving back the emergence of nail phenomenon, and overall structure is simple relatively, possess the preferred prevent moving back nail effect and convenient the dismantlement.

Description

Anti-back screw

Technical Field

The utility model relates to a screw fixation field, specific is a prevent moving back screw.

Background

The screw is usually as connecting fixed part, is the important component in modern science and technology, and wide application is in each field such as industry and agriculture and biomedical, but traditional screw is difficult to avoid having the nail phenomenon of moving back, especially has to move back the nail problem more easily to appear under the condition of repeated vibration between fixed spongy object or connecting piece. The prior art scheme tends to increase the fastening force by using an expansion screw type structure or increasing the width of a thread or the like, or increases the friction by adding a coating on the screw, or injects an adhesive medium into the screw, but the application range and the effect are very limited, and the screw is not convenient to disassemble after being screwed.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a prevent moving back screw. The fastening is realized through main nail portion screw thread, and the partial skew of rethread eccentric portion gets off the locking main nail portion in the cooperation of second tail cap structure, prevents to move back the emergence of nail phenomenon, and the locking state of eccentric portion is reversible, and overall structure is simple relatively, possess the preferred prevent that the screw withdraws from the effect and convenient the dismantlement.

The utility model discloses the technical problem that will solve realizes through following technical scheme: a setback-proof screw comprises a main screw part and an eccentric part, wherein the main screw part is provided with an eccentric hole in the direction of a long longitudinal axis; the eccentric part passes through an eccentric hole on the main nail part; the head cap is eccentrically connected with the eccentric part, so that the long longitudinal axis of the head cap is not overlapped on a rotating shaft when the eccentric part rotates independently.

Further, the main nail surface is provided with a first thread structure which is used for gripping the materials around the screw so as to realize the fastening function; the screw threads can be distributed on the whole surface of the main nail part, and can also be distributed on the partial surface of the main nail part; wherein, the screw thread can be equidistant screw thread, also can be the special-shaped screw thread such as non-equidistant.

Further, the main nail part has a first tail cap structure at the tail end, and the circumference of the first tail cap is preferably, but not limited to, larger than the circumference of the rest part of the main nail part, so as to realize pressurization of the tail end, it can be understood that the circumference of the first tail cap may be equal to or smaller than the circumference of the rest part of the main nail in a specific use scene, for example, a countersunk head nail or the like is required to be used; the first tail cap is provided with a groove which can be in a shape of a straight line, a cross, an inner hexagon and the like and is used for matching with a screwdriver head of a screwdriver and transmitting rotating torque force; wherein, when needing many pieces of anti-back screw connection uses, prior art scheme connects many pieces of screws through the connecting rod, is provided with the trompil or the recess of symmetric distribution on the first tail cap of anti-back screw this moment to hold the connecting rod with this, reach the purpose of connecting many pieces of screws.

Furthermore, the eccentric hole of the main nail part is provided with a limiting groove structure at the near tail end, and the limiting groove structure is used for matching a limiting spring in a second tail cap transverse through hole on the eccentric part to limit the rotation of the limiting spring, namely the rotation of the eccentric part, so as to achieve the aim of locking the eccentric part; the limiting grooves are arranged in pairs which are generally 180 degrees symmetrical so as to provide more blocking force for locking; the specific number of the limiting grooves is determined by the number of locking angles required to be provided, for example, locking is performed when the eccentric hole needs to rotate by 45 degrees, the limiting groove is arranged on the eccentric hole wall and deflects by 45 degrees by taking the initial limiting groove as a reference, similarly, when locking is performed when the eccentric hole needs to rotate by 90 degrees, another limiting groove needs to be additionally arranged at the position deflected by 90 degrees, and the like.

Furthermore, the eccentric part is provided with a head cap structure at the head end, when the head cap is positioned at the top end of the main nail part, the long longitudinal axis of the head cap is overlapped with the long longitudinal axis of the main nail part in the initial state, so that the eccentric part and the main nail part can rotate on the same axis when the nail is initially driven, and the screwing-in of the screw is facilitated.

Further, to facilitate screwing in the screw, the head cap of the eccentric portion may be prepared with a self-tapping thread or a self-drilling blade structure, preferably but not limited to a self-drilling blade structure; in general, the self-drilling cutting edge can be used for assisting hole expansion, and when the screw does not completely penetrate through an acting object, the self-drilling cutting edge structure is beneficial to the deviation of the eccentric part in the acting object; when tapping is required, the tapping thread can eliminate the step of tapping by using a tap alone, and the tapping are beneficial to screwing in of the screw.

Furthermore, the tail end of the eccentric part is provided with a second tail cap structure, and the section of structure is matched with the second tail cap structure to realize the rotation and locking of the eccentric part; a transverse through hole is formed in the eccentric part, an elastic limiting spring is arranged in the transverse through hole, and the eccentric part can be locked by matching with a limiting groove on the main nail part; the second tail cap is provided with a groove which can be in a shape of a straight line, a cross, an inner hexagon and the like and is used for matching with the screwdriver head and transmitting the rotating torque force, and the groove structure is beneficial to saving the operation space; it is understood by those skilled in the art that the screw may have other equivalent structures, for example, a through hole corresponding to a transverse hole at a second tail cap of the eccentric portion is provided at a first tail cap of the main nail portion, and a bolt is used to replace a limit spring, so that the eccentric portion can be locked; for example, threads are prepared on the periphery of the second tail cap of the eccentric part, matched threads are prepared at the corresponding position of the tail end of the eccentric hole of the main nail part, the eccentric part is locked by meshing of the threads, and the threads can be equidistant threads or non-equidistant special-shaped threads; similarly, the eccentric portion head cap structure is not limited to the head top end of the main nail portion, and the position of the eccentric portion head cap structure can be changed correspondingly, for example, the eccentric portion head cap structure can be prepared to be located at the first thread of the main nail portion.

The utility model discloses following beneficial effect has: the anti-back screw comprises a main screw part and an eccentric part, and is characterized in that the main screw part is provided with an eccentric hole in the direction of a long longitudinal axis; the eccentric part passes through the eccentric hole; the eccentric portion has head cap structure at the head end, head cap and eccentric portion are eccentric connection, the eccentric portion has second tail cap structure at the tail end. This prevent moving back screw passes through main nail portion screw thread and realizes the fastening, but the eccentric portion of independent rotation when advancing the nail to certain degree of depth, through the partial skew of eccentric portion and lock main nail portion through the cooperation of second tail cap structure simultaneously, prevents moving back the emergence of nail phenomenon, is particularly useful for the occasion that can only one-way completion advance the nail operation, and overall structure is simple relatively, uses less spare part to realize that the screw of preferred prevents withdrawing from the effect and convenient the dismantlement.

Drawings

FIG. 1 is a schematic view of a main nail portion of an anti-back screw;

FIG. 2 is a schematic view of an eccentric portion of an anti-back screw;

FIG. 3 is a schematic view of the combination of the main nail portion and the eccentric portion of the setback prevention screw (at the beginning);

FIG. 4 is a schematic view of the tail end structures of the main nail portion and the eccentric portion of the anti-back screw;

FIG. 5a is a schematic view of the combination of the main nail portion and the eccentric portion of a setback prevention screw (at the beginning);

FIG. 5b is a schematic view of the main nail portion and the tail end of the eccentric portion of an anti-back screw (at the beginning);

FIG. 6a is a schematic view of the combination of the main nail portion and the eccentric portion of a setback prevention screw (when the eccentric portion is partially rotated);

FIG. 6b is a schematic view of the main nail portion and the tail end of the eccentric portion of an anti-back screw (when the eccentric portion is partially rotated).

The self-tapping screw comprises a main screw part 1, an eccentric hole 11, a main screw part, a first tail cap 12, a first tail cap 121, a limiting groove 122, a first straight-line-shaped groove 122, a first thread 13, a first thread 14, a long longitudinal axis 2, an eccentric part 21, a head cap 211, a self-tapping thread 212, a self-drilling blade edge 22, a second tail cap 221, a transverse through hole 222, a first straight-line-shaped groove 23, a long longitudinal axis 3 and a limiting spring, wherein the eccentric hole is formed in the main screw part, the first tail cap is arranged on the main screw part, the long longitudinal axis 14 is arranged on the main screw part, the head cap is arranged on the eccentric part 21, the self-tapping thread 211 is arranged on the head cap, the self-drilling.

Detailed Description

The present invention will be described in detail with reference to the following embodiments and drawings. It should be understood by those skilled in the art that the embodiments are merely preferred modes of the present invention and are not to be construed as limiting the present invention.

Example 1: as shown in fig. 1, 2, 3, 4, 5a, 5b, 6a and 6b, the anti-back screw comprises a main screw part (1) and an eccentric part (2), wherein the main screw part (1) is provided with an eccentric hole (11) in the long longitudinal axis direction; the eccentric part (2) passes through an eccentric hole (11) on the main nail part; the head cap (21) structure is arranged at the head end of the eccentric part (2), and the head cap (21) is eccentrically connected with the eccentric part (2).

Further, the surface of the main nail part (1) is provided with a first thread structure (13) which is used for grasping the materials around the screw so as to realize the fastening effect.

Further, the main nail part (1) is provided with a first tail cap (12) structure at the tail end, the circumference of the first tail cap (12) is preferably, but not limited to, larger than the circumference of the rest part of the main nail part (1) so as to realize the pressurization of the tail end, and it can be understood that the circumference of the first tail cap (12) can be equal to or smaller than the circumference of the rest part of the main nail under a specific use scene, for example, a countersunk head nail or the like is required to be used; the first tail cap is provided with a groove, the groove is in a straight line shape (122) in the embodiment and is used for matching with the screwdriver bit.

Furthermore, the eccentric hole (11) of the main nail part is provided with a limiting groove (121) structure at the tail end, the limiting groove (121) is used for matching a limiting spring (3) in a second tail cap transverse through hole (221) on the eccentric part (2), and the limiting spring (3) is limited to rotate in a single direction, namely the rotation of the eccentric part (2) is limited, so that the purpose of locking the eccentric part (2) is achieved.

Further, the eccentric part (2) is provided with a head cap (21) structure at the head end, and the long longitudinal axis (23) of the head cap is overlapped with the long longitudinal axis (14) of the main nail part at the initial time, so that the eccentric part (2) and the main nail part (1) can rotate on the same axis at the initial nail feeding time, and the nail feeding is facilitated.

Further, in order to facilitate screwing in the screw, the head cap (21) of the eccentric part can be prepared to have a self-tapping thread (211) or a self-drilling blade (212) structure. Generally, the use of self-tapping threads (211) eliminates the need for tapping with a separate tap, while the self-drilling blades (212) assist in reaming and offsetting the eccentric, both of which facilitate the threading of the screw.

Furthermore, the tail end of the eccentric part (2) is provided with a second tail cap (22) structure section, a transverse through hole (221) is formed in the second tail cap structure section, a limiting spring (3) is arranged in the transverse through hole (221), and the eccentric part (2) can be locked by matching with a limiting groove (121) on the main nail part (1); the second tail cap (22) is provided with a groove which is in a straight line shape (222) in the embodiment and is used for matching with the screwdriver bit.

Example 2: as shown in fig. 1, 2 and 3, a through hole corresponding to the transverse through hole (221) at the second tail cap (22) of the eccentric part is arranged at the first tail cap (12) of the main nail part, and the corresponding means that: when the preset eccentric part (2) is locked when rotated by a degrees, the long longitudinal axis of the through hole on the first tail cap (12) of the main nail part and the long longitudinal axis of the transverse through hole (221) on the second tail cap (22) of the eccentric part form a degrees in the initial state, and the two axes are overlapped when rotated to the locked state; at this time, the eccentric part (2) can be locked by replacing the limit spring (3) in the embodiment 1 with a latch.

Example 3: as shown in fig. 1 and 2, the second tail cap (22) of the eccentric portion has a transverse through hole (221), in this embodiment, the second tail cap (22) of the eccentric portion does not need to have the transverse through hole (221), at this time, a thread is made on the periphery of the second tail cap (22) of the eccentric portion, and a matching thread is made at a position corresponding to the tail end of the eccentric hole (11) of the main nail portion; when the main nail part (1) and the eccentric part (2) rotate simultaneously, the peripheral threads of the second tail cap (22) of the eccentric part and the corresponding threads at the tail end of the eccentric hole (11) of the main nail part do not slide relatively, and the locking state is realized at the moment; when the eccentric part (2) rotates independently, the peripheral threads of the second tail cap (22) of the eccentric part and the corresponding threads at the tail end of the eccentric hole (11) of the main nail part lock the eccentric part through the meshing of the threads.

Example 4: as shown in fig. 3, the eccentric portion head cap (21) is in a conical shape and is located at the top end position of the main nail portion (1), in this embodiment, the structure of the eccentric portion head cap (21) is not limited to a conical shape, and may be in a flat structure, and its position may be changed accordingly, for example, it may be prepared to be located at the first thread (13) of the main nail portion.

The accompanying drawings are used for illustrating the embodiments and not for limiting the shapes and sizes of the components, and the above embodiments do not limit the scope of the present invention, and the equivalent structures made by using the contents of the description and the accompanying drawings of the present invention are included in the scope of the present invention.

Claims

1. The utility model provides an anti-back screw, includes main nail portion (1), eccentric portion (2), its characterized in that: the main nail part (1) is provided with an eccentric hole (11) in the direction of the long longitudinal axis thereof; the eccentric part (2) passes through the eccentric hole (11); the head end of the eccentric part (2) is provided with a head cap (21) structure, and the head cap (21) is eccentrically connected with the eccentric part (2); the eccentric part (2) is provided with a second tail cap (22) structure at the tail end.

2. Anti-back screw according to claim 1, characterized in that the surface of the main shank (1) has a first thread (13) configuration.

3. Setscrew according to claim 1, characterised in that the main shank (1) has a first tail cap (12) configuration at the tail end.

4. The setback screw according to claim 3, wherein said first tail cap (12) is provided with at least one of a symmetrical opening and a symmetrical recess.

5. The setback screw according to claim 1, wherein the eccentric hole (11) of the main shank portion has a structure of a limiting groove (121) at the rear end.

6. Anti-back screw according to claim 5, characterized in that the retaining grooves (121) are configured symmetrically in pairs.

7. The setback screw as claimed in claim 1, wherein the head cap (21) of the eccentric portion has at least one of a self-tapping thread (211) structure and a self-drilling blade (212) structure.

8. Anti-back screw according to claim 1, characterized in that the second tail cap (22) of the eccentric portion has a groove.

9. Anti-back screw according to claim 1, characterized in that the second tail cap (22) of the eccentric portion has a cross-hole (221) configuration.

10. Anti-back screw according to claim 9, characterized in that inside said transversal through hole (221) there is a structure of a limit spring (3).