Durable anti-falling hardware screw fastener

Abstract

The utility model relates to the field of hardware screws, in particular to a durable anti-falling hardware screw fastener which comprises a screw head. A screw rod is arranged at the lower end of the screw head, the upper part of the screw rod forms a smooth surface, a first threaded section is formed in the middle of the screw rod, a second threaded section is formed at the lower part of the screw rod, and the thread pitch of the second threaded section is smaller than that of the first threaded section; an elastic locking piece is arranged on the smooth face of the upper portion of the screw rod in a sleeved mode, and the elastic locking piece and the screw head are matched in a limiting mode. The screw has the beneficial effects that the thread pitch of the second thread section on the screw rod is smaller than that of the first thread section, so that a wedge-shaped meshing effect can be formed when the screw is used, and the thread teeth generate radial expansion force on the wall of the screw hole when the screw is screwed, so that the friction force is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the hardware screw field especially is related to a durable anti -drop hardware screw fastener. BACKGROUND

[0002] In modern manufacturing and construction industry, screw fasteners play a vital role, they are used to firmly connect various components together.

[0003] Chinese patent (announcement number: CN222391726U) a durable anti -drop hardware screw fastener, through setting up two -way thread prevents the mechanism and the glue content and is received mechanism lets screw after being embedded in the object inside, can pass two groups angle different stripe structure prevents the screw from rotating outward, and by the glue that is extruded and overflowed fills the gap in the hole of screw and object, fills to further fix screw and object together to prevent screw from falling, and by the rust -resistant plating layer on the surface of screw prevents the corrosion from outside to prolong the service life of screw.

[0004] However, the above -mentioned screw prevents the self -falling after playing, is inconvenient to disassemble, reduces practicality. UTILITY MODEL CONTENT

[0005] The utility model overcomes the above -mentioned situation shortage, provides a technical scheme that can solve the above -mentioned problem.

[0006] A durable anti -drop hardware screw fastener, including screw head;

[0007] The lower end of the screw head is provided with a screw rod, the upper part of the screw rod is shaped as a smooth surface, the middle part of the screw rod is shaped with a first threaded section, the lower part of the screw rod is shaped with a second threaded section, and the thread spacing of the second threaded section is smaller than that of the first threaded section;

[0008] The smooth surface of the upper part of the screw rod is sleeved with an elastic locking piece, and the elastic locking piece is limited and matched with the screw head.

[0009] As a further scheme of the utility model: the elastic locking piece includes two metal gaskets, and an elastic rubber pad is arranged between the two metal gaskets, wherein the outer side of the metal gasket close to the screw head is provided with a first anti -skid tooth ring, the side close to the metal gasket of the screw head is provided with a second anti -skid tooth ring, the first anti -skid tooth ring and the second anti -skid tooth ring are limited and matched with each other, and the tooth tip of the first anti -skid tooth ring faces the locking direction of the screw.

[0010] As a further scheme of the utility model: a threaded gradual change section is arranged between the second threaded section and the first threaded section, and the thread spacing of the second threaded section is gradually widened to the thread spacing of the first threaded section through the threaded gradual change section.

[0011] As a further scheme of the utility model: the surface of the screw head, the screw rod and the metal gasket is coated with a diamond-like coating.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1. The thread spacing of the second thread section is smaller than that of the first thread section, so that the wedge-shaped engagement effect is formed during use, the radial expansion force is generated on the screw hole wall during screwing, and the friction force is enhanced.

[0014] 2. The elastic locking piece is arranged on the smooth surface of the screw rod, the elastic rubber pad is pressed downward by the screw head during screwing, the elastic rubber pad drives the metal gasket to press the screw head upward after screwing, the first anti-skid tooth ring of the metal gasket is limited and clamped with the second anti-skid tooth ring of the screw head, stress reversal is avoided, and the upward force is provided on the screw, so that the friction force is enhanced and the stability is improved.

[0015] The additional aspects and advantages of the utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiment or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0017] Fig. 1 It is a structural schematic view of the utility model.

[0018] Fig. 2 It is a structural schematic view of the metal gasket.

[0019] Fig. 3 It is a cooperation schematic view of the screw head and the metal gasket.

[0020] As shown in the figure: 1, screw head; 2, screw rod; 3, smooth surface; 4, first thread section; 5, second thread section; 6, metal gasket; 7, elastic rubber pad; 8, first anti-skid tooth ring; 9, second anti-skid tooth ring; 10, thread gradual change section; 11, diamond-like coating. DETAILED DESCRIPTION

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] Please see Figs. 1-3 A durable, non-loosening hardware screw fastener, including a screw head 1;

[0026] The lower end of the screw head 1 is provided with a screw rod 2, the upper part of the screw rod 2 is formed as a smooth surface 3, the middle part of the screw rod 2 is formed with a first threaded section 4, and the lower part of the screw rod 2 is formed with a second threaded section 5. The thread pitch of the second threaded section 5 is smaller than that of the first threaded section 4.

[0027] An elastic locking plate is fitted on the smooth surface 3 of the upper part of the screw 2, and the elastic locking plate and the screw head 1 are mutually limited and matched.

[0028] By the thread spacing of the second thread section 5 on the screw rod 2 being smaller than the first thread section 4, a "wedge engagement" effect can be formed during use, the second thread section 5 is first positioned quickly during screwing, the thread teeth of the first thread section 4 generate a radial expansion force on the screw hole wall, and the friction force is enhanced; the elastic locking piece can avoid stress reversal of the screw, and at the same time, provide an upward force to the screw, thereby enhancing the friction force and improving stability.

[0029] Further scheme: the elastic locking piece includes upper and lower metal washers 6, and an elastic rubber pad 7 is arranged between the two metal washers 6, wherein the outer side of the metal washer 6 close to the screw head 1 is provided with a first anti-skid tooth ring 8, the side close to the metal washer 6 of the screw head 1 is provided with a second anti-skid tooth ring 9, the first anti-skid tooth ring 8 and the second anti-skid tooth ring 9 are limited and clamped in cooperation with each other, and the tooth tip of the first anti-skid tooth ring 8 faces the locking direction of the screw.

[0030] By arranging the elastic locking piece at the smooth surface 3 of the screw rod 2, when the screw is tightened, the screw head 1 extrudes the elastic rubber pad 7 downward, after tightening, the elastic rubber pad 7 drives the metal washer 6 to extrude the screw head 1 upward, the first anti-skid tooth ring 8 of the metal washer 6 and the second anti-skid tooth ring 9 of the screw head 1 are limited and clamped in cooperation with each other, stress reversal is avoided, and at the same time, an upward force is provided to the screw, thereby enhancing the friction force and improving stability.

[0031] Further scheme: a thread gradual change section 10 is arranged between the second thread section 5 and the first thread section 4, and the thread spacing of the second thread section 5 is gradually widened to the thread spacing of the first thread section 4 through the thread gradual change section 10.

[0032] The smoothness during tightening of the screw is ensured, and the "wedge engagement" effect is formed, the thread teeth generate a radial expansion force on the screw hole wall during tightening, and the friction force is enhanced.

[0033] Further scheme: the surfaces of the screw head 1, the screw rod 2 and the metal washer 6 are coated with a diamond-like coating 11.

[0034] The corrosion from the outside can be prevented to prolong the service life of the screw.

[0035] It is also to be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component" can include a combination of two or more components, and the term "an element" can include comparable reference to a plurality of elements. Additionally, the term "or" as used herein means any one member of a logical disjunction (i.e., it is equivalent to "or" and "or else") and not a logical exclusion. Also, the terms "comprise," "comprising," "include," "including," and the like mean "including but not limited to." Furthermore, the description herein uses terms such as first and second to denote different elements, but the applicants do not intend these terms to denote an ordering, because some of these elements can, in fact, precede other ones in some of the implementations.

[0036] The above description of disclosed embodiments provides examples, and is not intended to be limiting. Numerous modifications of the embodiments, as defined herein, will be apparent to those in the art, and will not depart from the spirit or scope of the application. Accordingly, the application will be limited only by the scope of the claims.

Claims

1. A durable anti-loosening fastener for hardware screws, characterized by: Screw head (1) is provided with screw rod (2) at lower end, upper part of screw rod (2) is shaped as smooth surface (3), middle part of screw rod (2) is shaped as first thread segment (4), lower part of screw rod (2) is shaped as second thread segment (5), thread pitch of second thread segment (5) is less than first thread segment (4); Screw rod (2) upper part smooth surface (3) is provided with elastic locking piece, elastic locking piece and screw head (1) are mutually limited and fit. Elastic locking piece includes two metal gaskets (6) upwards and downwards, and is provided with elastic rubber pad (7) between two metal gaskets (6), wherein the outside of metal gasket (6) near screw head (1) side is provided with first anti-skid tooth ring (8), the side of screw head (1) near metal gasket (6) is provided with second anti-skid tooth ring (9), first anti-skid tooth ring (8) and second anti-skid tooth ring (9) are mutually limited and clamped and fit, and the tooth tip of first anti-skid tooth ring (8) is towards the locking direction of screw.

2. The ruggedized, anti-loosening fastener of claim 1, wherein: Second thread segment (5) and first thread segment (4) are provided with thread gradual change segment (10) between, and the thread pitch of second thread segment (5) is gradually widened to the thread pitch of first thread segment (4) through thread gradual change segment (10).

3. The ruggedized, anti-loose fastener of claim 1, wherein: The surface of screw head (1), screw rod (2) and metal gasket (6) is coated with diamond-like coating (11).

4. The ruggedized, anti-loose fastener of claim 1, wherein: ​

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