Countersunk self-tapping screw easy to install

Abstract

The utility model provides a countersunk self-tapping screw easy to install, which belongs to the technical field of screws and comprises a screw rod and a screw cap. A connecting groove is formed in the top surface of the screw cap; an inserting groove is formed in the bottom of the connecting groove; two groups of sliding open grooves are outwards formed in the insertion groove; clamping blocks are arranged in the sliding open grooves in a sliding mode. A push rod used for pushing out the clamping block is arranged in the inserting groove in a matched mode. A sealing block is arranged at the top end of the push rod; and the sealing block is matched with the connecting groove. The insertion groove is downwards formed in the end face of the screw, the sliding open grooves are formed in the circumferential face of the insertion groove, the push rods are arranged in the insertion groove in a matched mode, the push rods can push the clamping blocks located in the sliding open grooves to move outwards to achieve clamping, and the connection strength and stability after the screw is installed can be improved; meanwhile, the sealing block at the end part of the push rod can be matched with the connecting groove at the end part of the screw to fill and level up the end surface of the screw, so that the screw is more attractive after being mounted.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw technical field, concretely relates to an easy-to-install countersunk self-tapping screw. BACKGROUND

[0002] Self-tapping screw is a kind of screw that can directly tap thread on the connected part, without pre-threading.It is mainly composed of head, shank and shank end, with good core toughness, high connection strength and other characteristics.Countersunk self-tapping screw sinks in the installation object after installation, so that the surface of installation object remains flush, without screw head protrusion.When the size of self-tapping screw is relatively large, the recess on the end face will cause obvious recess after installation, affecting the flatness of installation object surface, and the stability of large-size threaded connection is poor.Therefore, the utility model provides an easy-to-install countersunk self-tapping screw. SUMMARY

[0003] The utility model aims at providing an easy-to-install countersunk self-tapping screw.

[0004] To solve the above technical problems, the utility model aims at realizing as follows:

[0005] An easy-to-install countersunk self-tapping screw, comprising: screw rod and screw cap;The bottom of the screw rod is provided with a pointed structure, and the surface is provided with threads;The screw cap is arranged at the end of the screw rod, and the cross section is inverted trapezoidal;

[0006] The top surface of the screw cap is centrally recessed to form a regular polygonal connecting groove;The bottom surface of the connecting groove is centrally recessed to form an insertion groove;The insertion groove extends into the screw rod, and two groups of sliding slots are formed outward from the insertion groove;The sliding slots penetrate the screw rod, and each group of sliding slots has a plurality of sliding slots evenly distributed along the circumference of the screw rod;Two groups of sliding slots are arranged staggered, and each sliding slot is slidably provided with a clamping block;The outer end of the clamping block does not exceed the outer circumferential surface of the screw rod, and the inner end is located in the insertion groove;

[0007] The insertion groove is matched with a push rod for pushing out the clamping block;The top end of the push rod is provided with a sealing block;The sealing block is matched with the connecting groove;A plurality of grooves are formed in the push rod from the bottom end upward;The grooves are matched with the clamping blocks relatively close to the screw cap, and the grooves extend to the middle of the push rod, so that the push rod can push out the clamping blocks relatively close to the screw cap.

[0008] As a preferred scheme of the above scheme and on the basis of the above scheme, the connecting groove is a regular hexagonal connecting groove; the sealing block is a regular hexagonal column structure matched with the connecting groove, and the end face of the sealing block is flush with the end face of the screw nut when the sealing block is completely fitted in the connecting groove.

[0009] As a preferred scheme of the above scheme and on the basis of the above scheme, the cross section of the insertion groove is circular; and the number of the sliding grooves in each group is four.

[0010] As a preferred scheme of the above scheme and on the basis of the above scheme, the sliding grooves gradually narrow from the center of the screw rod to the outside.

[0011] As a preferred scheme of the above scheme and on the basis of the above scheme, the inner end of the clamping block is a bevel structure with a small upper end and a large lower end, and the outer end is provided with a plurality of clamping teeth distributed along the height.

[0012] As a preferred scheme of the above scheme and on the basis of the above scheme, the bottom of the push rod is a reverse circular table structure.

[0013] As a preferred scheme of the above scheme and on the basis of the above scheme, the top end of the groove is a bevel structure.

[0014] The beneficial effects of the present application are as follows: the insertion groove is formed on the screw end face downward, a plurality of sliding grooves are formed on the peripheral surface of the insertion groove, a push rod is matched inside, the push rod can push the clamping block in the sliding groove to move outward to realize clamping, the connection strength and stability after the screw is installed can be improved; meanwhile, the sealing block at the end of the push rod can be matched with the connecting groove at the end of the screw, the screw end face is filled flat, and the screw installation is more beautiful after being completed. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the present application.

[0016] Figure 2 It is another state structural schematic view of the present application.

[0017] Figure 3 It is a sectional view of the present application.

[0018] Figure 4 It is a partial structural schematic view of the present application.

[0019] In the figure: 1, screw rod; 2, screw nut; 3, connecting groove; 4, insertion groove; 5, sliding groove; 6, clamping block; 7, push rod; 8, sealing block; 9, groove; 10, clamping tooth. DETAILED DESCRIPTION

[0020] The present application will be further described below in combination with the drawings and specific embodiments.

[0021] As shown in Figures 1 to 3 , a kind of easy-to-install countersunk self-tapping screw, comprising: screw rod 1 and screw cap 2, the bottom of screw rod 1 is provided as pointed structure, and the surface is provided with thread.Screw cap 2 is arranged at the end of screw rod 1, and its section is inverted trapezoidal.

[0022] The top surface of screw cap 2 is centrally recessed to form a regular polygonal connecting groove 3, which is used for screw and tool connection and cooperation, and facilitates the tool to drive the screw to rotate. Preferably, the connecting groove 3 is a regular hexagonal connecting groove 3.

[0023] The bottom surface of connecting groove 3 is centrally recessed to form an insertion groove 4, which extends downward into screw rod 1, and the outer side of insertion groove 4 is provided with two groups of sliding grooves 5 extending outward from insertion groove 4. The sliding grooves 5 penetrate through the screw rod 1, and the number of each group of sliding grooves 5 is several, which are uniformly distributed along the circumference of the screw rod 1. The two groups of sliding grooves 5 are arranged staggered, and each sliding groove 5 is slidably provided with a clamping block 6. The outer end of clamping block 6 does not exceed the outer circumferential surface of screw rod 1, and the inner end is located in the insertion groove 4.

[0024] Specifically, the cross section of insertion groove 4 is circular, and the number of each group of sliding grooves 5 is four. The sliding grooves 5 gradually narrow from the center of the screw rod 1 outward, so as to limit the clamping block 6 and make it unable to move outward at will. At the same time, the inner end of clamping block 6 is provided with a slope structure with small upper and large lower, and the outer end is provided with a plurality of clamping teeth 10 distributed along its height. The slope structure makes it easy for clamping block 6 to be pushed out, and the clamping teeth 10 can improve the connection firmness between clamping block 6 and the installed object.

[0025] The insertion groove 4 is matched with a push rod 7 for pushing out the clamping block 6. The top end of push rod 7 is provided with a sealing block 8, which is matched with connecting groove 3 and used for filling connecting groove 3. In the embodiment, the sealing block 8 is a regular hexagonal prism structure matched with the connecting groove 3, and when the sealing block 8 is completely matched in the connecting groove 3, the end face is flush with the end face of screw cap 2.

[0026] The push rod 7 is provided with a plurality of grooves 9 upward from its bottom end, which are matched with the clamping block 6 relatively close to the screw cap 2, and the grooves 9 extend to the middle of the push rod 7, so as to satisfy that the push rod 7 can push out the clamping block 6 relatively close to the screw cap 2. When the push rod 7 is pushed downward, the clamping block 6 relatively close to the screw cap 2 can be avoided to be pushed out first through the grooves 9, so as to realize that the two groups of clamping blocks 6 are pushed out at the same time.

[0027] Preferably, as shown in Figure 4 , the bottom of push rod 7 is a reverse circular table structure, which is convenient for cooperation with each clamping block 6 and convenient for pushing out the clamping block 6. The top end of groove 9 is provided with a slope structure, which is used for facilitating cooperation with clamping block 6, so as to push out clamping block 6.

[0028] Working process: first screw into the installation object, then put the push rod 7 into the insertion groove 4, until its end and the top of the groove 9 with two groups of clamping block 6 respectively, then use hammer and other tools to knock the sealing block 8, make the push rod 7 continue to move inward, and at the same time push out each clamping block 6, until the sealing block 8 completely subsides in the connecting groove 3.

[0029] The above describes the preferred embodiments of the present application in detail. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the present application shall be within the protection scope defined by the claims.

Claims

1. An easy-to-install countersunk self-tapping screw, characterized in that: include: A screw (1) and a nut (2); the bottom of the screw (1) is configured as a pointed structure, and the surface is provided with threads; the nut (2) is provided at the end of the screw (1), and its cross section is an inverted trapezoid; The center of the top surface of the nut (2) is recessed downward to form a regular polygonal connecting groove (3); the center of the bottom surface of the connecting groove (3) is recessed downward to form an insertion groove (4); the insertion groove (4) extends into the screw (1), and two groups of sliding grooves (5) are opened outward from the insertion groove (4); the sliding grooves (5) pass through the screw (1), and the number of each group of sliding grooves (5) is several and evenly distributed along the circumference of the screw (1); the two groups of sliding grooves (5) are staggered, and a clamping block (6) is slidably arranged in each sliding groove (5); the outer end of the clamping block (6) does not exceed the outer peripheral surface of the screw (1), and the inner end is located in the insertion groove (4); The insertion groove (4) is equipped with a push rod (7) for pushing out the clamping block (6); a sealing block (8) is provided at the top of the push rod (7); the sealing block (8) is adapted to the connecting groove (3); the push rod (7) is provided with a plurality of grooves (9) extending upward from its bottom end; the grooves (9) are adapted to the clamping block (6) relatively close to the nut (2), and the grooves (9) extend to the middle of the push rod (7) to ensure that the push rod (7) can push out the clamping block (6) relatively close to the nut (2).

2. The easy-to-install countersunk self-tapping screw according to claim 1, characterized in that: The connecting groove (3) is a regular hexagonal connecting groove (3); the sealing block (8) is a regular hexagonal rectangular column structure adapted to the connecting groove (3); and when the sealing block (8) is fully fitted in the connecting groove (3), its end face is flush with the end face of the nut (2).

3. The easy-to-install countersunk self-tapping screw according to claim 1, characterized in that: The cross section of the insertion groove (4) is circular; the number of each group of sliding slots (5) is four.

4. The easy-to-install countersunk self-tapping screw according to claim 1, characterized in that: The sliding slot (5) gradually narrows from the center of the screw (1) toward the outside.

5. The easy-to-install countersunk self-tapping screw according to claim 1, characterized in that: The inner end of the clamping block (6) is in a sloped structure with a smaller upper portion and a larger lower portion, and the outer end is provided with a plurality of clamping teeth (10) evenly distributed along the height thereof.

6. The easy-to-install countersunk self-tapping screw according to claim 5, characterized in that: The bottom of the push rod (7) is in an inverted frustum structure.

7. The easy-to-install countersunk self-tapping screw according to claim 6, characterized in that: The top end of the groove (9) is in a sloped structure.

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