Screw with bidirectional fixing structure

Abstract

The utility model discloses a screw with a bidirectional fixing structure, which comprises an outer pipe and an inner screw rod arranged in the outer pipe, and the outer pipe is a cylinder with two open ends; an outer conical part is arranged at the bottom of the outer pipe and is integrally connected with the outer pipe; a hollow through channel is formed in the outer conical part and is communicated with an inner cavity of the outer pipe; left-hand threads are arranged inside the outer side of the outer pipe, and right-hand threads are arranged on the inner diameter face of the outer pipe. The top of the outer pipe is provided with a nut; the inner screw moves up and down in the axial direction of the outer pipe, the inner screw is composed of a screw body and an inner conical part, the screw body is a cylinder, and the inner conical part is arranged at the bottom of the screw body; and right-hand threads matched with the right-hand threads on the inner diameter surface of the outer pipe are arranged on the outer side of the screw. After the outer pipe main body rotates to enter the inner part, the inner screw rod is rotated in the reverse direction, and meanwhile, as the outer pipe is arranged to rotate leftwards and the inner screw rod is arranged to rotate rightwards, one screw can be rotated and fixed in two directions and is not easy to fall off, and the tightness of connection is improved.

Description

Technical Field

[0001] The utility model relates to the field of screw fasteners, in particular to a screw with a bidirectional fixing structure. Background Art

[0002] There are many kinds of screw fasteners, including bolts, studs, screws, nuts, self-tapping screws, wood screws, etc. Traditional screws are generally composed of a head and a screw rod. The screw rod can only be set with a single left-handed or right-handed thread. After installation, as time goes by, if there is relative movement between the thread surfaces, the imbalance between the upward resistance and the downward resistance of the thread surface will cause the thread to slide in the direction of the thread loosening on the lower side, resulting in rotational loosening. Therefore, it is urgent to propose a new type of screw to solve the above problem. Utility Model Content

[0003] The utility model aims to provide a screw with a bidirectional fixing structure which has tight connection and high stability.

[0004] The purpose of the utility model is achieved in this way: a screw with a bidirectional fixing structure comprises an outer tube and an inner screw rod placed in the outer tube.

[0005] The outer tube is a cylindrical body with openings at both ends; the outer tube bottom is provided with an outer conical portion and connected as one piece, the outer conical portion is hollow and provided with a through channel connected to the inner cavity of the outer tube; the outer side of the outer tube is provided with a left-handed thread, and the inner diameter surface of the outer tube is provided with a right-handed thread; the top of the outer tube is provided with a nut;

[0006] An internal screw rod moves up and down axially along an outer tube. The internal screw rod consists of a screw rod and an inner conical portion. The screw rod is a cylinder, and the inner conical portion is placed at the bottom of the screw rod. The outer side of the screw rod is provided with a right-hand thread that matches the right-hand thread on the inner diameter surface of the outer tube.

[0007] Preferably, an insertion hole is opened at the center of the nut, and the inner diameter of the insertion hole is consistent with the diameter of the inner cavity of the outer tube; a retaining ring is provided on the inner diameter surface of the top of the insertion hole, and the inner diameter of the retaining ring is smaller than the diameter of the inner cavity of the outer tube.

[0008] Preferably, the tops of the nut and the screw rod are both provided with screwdriver fixing grooves.

[0009] Preferably, when the top of the screw rod contacts the lower side of the nut, the outer facade of the inner conical portion and the outer facade of the outer conical portion are connected to form an integral conical surface.

[0010] Preferably, the diameter of the screwdriver fixing groove on the nut is larger than the diameter of the insertion hole.

[0011] Compared with the prior art, the utility model is beneficial in that:

[0012] 1. After the outer tube rotates into the interior, the inner screw is rotated in the opposite direction. At the same time, since the outer tube is set to be left-handed and the inner screw is set to be right-handed, a screw can be rotated and fixed in both directions and will not fall off easily;

[0013] 2. Optimize the length of the screw so that the inner tapered portion of the screw and the outer tapered portion of the outer tube can form a complete tapered surface, thereby facilitating the screw to rotate in and improve installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a schematic diagram of the structure of the utility model after the inner screw is extended.

[0016] Among them, 1 is an outer tube, 101 is an outer tapered portion, 102 is a nut, 102 is an insertion hole, 2 is an inner screw rod, 201 is a screw rod, 202 is an inner tapered portion, and 3 is a screwdriver fixing groove. DETAILED DESCRIPTION

[0017] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0018] It should be noted that in the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figure 1-2 As shown, a screw with a bidirectional fixing structure includes an outer tube 1 and an inner screw rod 2 placed in the outer tube 1.

[0021] The outer tube 1 is a cylindrical body with openings at both ends; an outer conical portion 101 is provided at the bottom of the outer tube 1 and connected integrally; the outer conical portion 101 is hollow and provided with a through passage communicating with the inner cavity of the outer tube 1; a left-handed thread is provided inside the outer side of the outer tube 1, and a right-handed thread is provided on the inner diameter surface of the outer tube 1; a nut 102 is provided at the top of the outer tube 1;

[0022] The inner screw 2 moves up and down along the outer tube 1 as the axis. The inner screw 2 consists of a screw 201 and an inner tapered portion 202. The screw 201 is a cylinder, and the inner tapered portion 202 is placed at the bottom of the screw. The outer side of the screw 201 is provided with a right-hand thread that matches the right-hand thread on the inner diameter surface of the outer tube 1.

[0023] like Figure 1-2 As shown, an insertion hole 1021 is provided at the center of the nut 102, and the inner diameter of the insertion hole 1021 is consistent with the diameter of the inner cavity of the outer tube 1; a retaining ring 10211 is provided on the inner diameter surface of the top of the insertion hole 1021, and the inner diameter of the retaining ring 10211 is smaller than the diameter of the inner cavity of the outer tube 1; the insertion hole is used for inserting a screwdriver that matches the screwdriver fixing groove of the inner screw, so as to facilitate the rotation of the inner screw.

[0024] like Figure 1-2 As shown, the top of the nut 102 and the screw rod 201 are both provided with a screwdriver fixing groove 3. The screwdriver fixing groove of the outer tube is preferably a slotted groove, which is convenient for the screwdriver to cooperate with the outer tube. When inserting a screwdriver with a cross groove, the front end is inserted too deep and easily conflicts with the top of the inner screw, resulting in a failure to cooperate. The screwdriver fixing groove on the top of the screw can be either a slotted groove or a cross groove.

[0025] like Figure 1-2 As shown, when the top of the screw 201 collides with the lower side of the nut 102, the outer facade of the inner conical part 202 and the outer facade of the outer conical part 101 are connected to form an integrated conical surface, which facilitates the overall rotation of the screw; at the same time, after the screw collides with the lower side of the nut, the top of the inner screw is limited and will not be exposed from the outer tube.

[0026] like Figure 1-2 As shown, the diameter of the screwdriver fixing groove 3 on the nut 102 is larger than the diameter of the insertion hole 1021, ensuring that the screwdriver matching the outer tube nut will not fall into the insertion hole, making it convenient for operators to install.

[0027] The working principle of the utility model is explained as follows: when in use, the inner screw is rotated in the opposite direction until the top of the screw collides with the nut, and then the screw driver is used in conjunction with the nut to rotate the screw body onto the object to be fixed, and the nut is stopped after the nut collides with the object to be fixed; then the screw driver is used in conjunction with the inner screw to rotate the inner screw in the opposite direction to cooperate with the object to be fixed.

[0028] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents of the present invention for protection have been fully recorded in the claims.

Claims

1. A screw with a bidirectional fixing structure, characterized in that: It includes an outer tube and an inner screw placed in the outer tube. The outer tube is a cylindrical body with openings at both ends; the outer tube bottom is provided with an outer conical portion and connected as one piece, the outer conical portion is hollow and provided with a through channel connected to the inner cavity of the outer tube; the outer side of the outer tube is provided with a left-handed thread, and the inner diameter surface of the outer tube is provided with a right-handed thread; the top of the outer tube is provided with a nut; An internal screw rod moves up and down axially along an outer tube. The internal screw rod consists of a screw rod and an inner conical portion. The screw rod is a cylinder, and the inner conical portion is placed at the bottom of the screw rod. The outer side of the screw rod is provided with a right-hand thread that matches the right-hand thread on the inner diameter surface of the outer tube.

2. The screw with a bidirectional fixing structure according to claim 1, characterized in that: An insertion hole is provided at the center of the nut, and the inner diameter of the insertion hole is consistent with the diameter of the inner cavity of the outer tube; a retaining ring is provided on the inner diameter surface of the top of the insertion hole, and the inner diameter of the retaining ring is smaller than the diameter of the inner cavity of the outer tube.

3. The screw with a bidirectional fixing structure according to claim 1, characterized in that: The tops of the nut and the screw rod are both provided with screwdriver fixing grooves.

4. The screw with a bidirectional fixing structure according to claim 1, characterized in that: When the top of the screw rod contacts the lower side of the nut, the outer facade of the inner conical part and the outer facade of the outer conical part are connected to form an integrated conical surface.

5. The screw with a bidirectional fixing structure according to claim 3, characterized in that: The diameter of the screwdriver fixing groove on the nut is larger than the diameter of the insertion hole.

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