Self-tapping screw with double counter bores

Abstract

The self-tapping screw with the double counter bores comprises an end screw head, the lower surface of the end screw head is fixedly connected with a lap joint body, the side, away from the end screw head, of the lap joint body is fixedly connected with a first screw rod, and the lower end of the first screw rod is fixedly connected with a second screw rod through a connecting column body. A radial fixing assembly is arranged outside the connecting column body, the outer portion of the second screw rod is in threaded connection with an adapting ring, and a connecting strip is arranged in the adapting ring. By means of the structure, disintegrating slag in a drilled hole can slide down along the connecting strip in the matching ring and fall out of the inner portion of the matching ring, the interior of the hole is fixed through the radial fixing assembly on the connecting column body, the first screw rod is reversely rotated to enable the connecting column body to rotate in the second screw rod, and therefore the connecting column body is fixed. And the elastic piece can move towards the periphery to extrude the interior of the hole due to the fact that the elastic piece needs to carry out elastic recovery.

Description

Technical Field

[0001] This utility model relates to the field of self-tapping screw technology, and in particular to a self-tapping screw with double countersunk holes. Background Technology

[0002] Countersunk holes are recessed holes on the surface of an object. The entrance of a countersunk hole is wider and gradually narrows inward, forming a funnel-like shape. They are commonly used for screw installation in connectors. Countersunk holes ensure that the screw head and other components are completely hidden inside the object, improving the overall aesthetics and safety. For example, a Chinese patent discloses a self-tapping screw with application number CN201020603355.7. By placing the head on one side of the screw body and creating a cavity around the screw body connection, with the thread root on the screw body extending into the cavity, it is less prone to slippage when connecting to metal plates. However, under long-term use, vibration, and repeated stress, it may loosen. In addition, when fixing thick components, it is necessary to replace it with a screw of the corresponding length, thus requiring the preparation of screws of different sizes, which is not convenient enough in use. Utility Model Content

[0003] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a self-tapping screw with double countersunk holes. The connecting strip inside the mating ring allows the debris inside the drilled hole to slide down along it and fall out from inside the mating ring. The radial fixing component of the connecting column fixes the hole. Rotating the first screw in the opposite direction causes the connecting column to rotate inside the second screw, causing the fixing sliding block to slide out from the protruding end. The elastic element will move to all sides to perform elastic recovery, thus squeezing the inside of the hole.

[0004] This utility model also provides a self-tapping screw with a double countersunk hole as described above, comprising: an end screw head, a lap body fixedly connected to the lower surface of the end screw head, a first screw rod fixedly connected to the side of the lap body away from the end screw head, a recessed end fixedly connected to the end of the first screw rod away from the lap body, a connecting post fixedly connected to the end of the first screw rod away from the lap body, a second screw rod threadedly connected to the end of the connecting post away from the first screw rod, a protruding end fixedly connected to the end of the second screw rod, a radial fixing component provided on the outside of the connecting post, a mating ring threadedly connected to the outside of the second screw rod, a connecting strip provided inside the mating ring, and a bottom sleeve threadedly connected to the inside of the mating ring. Through the above components, the connecting strip inside the mating ring allows the debris inside the borehole to slide down along it and fall out from inside the mating ring. The radial fixing assembly of the connecting column fixes the hole. Rotating the first screw in the opposite direction causes the connecting column to rotate inside the second screw, causing the fixed sliding block to slide out from the protruding end. The elastic element will move to all sides to perform elastic recovery, thus squeezing the inside of the hole.

[0005] According to the present invention, a self-tapping screw with double countersunk holes has a circular outer end head and a groove inside the end head, with a cross-shaped hole inside the groove. Through these components, the first screw can be moved via the cross-shaped hole to facilitate tightening.

[0006] According to the present invention, a self-tapping screw with double countersunk holes is provided, wherein the recessed end is located above the protruding end, and the interior of the protruding end engages with the recessed end during operation. With these components, when the screw length does not need to be extended, the end faces of the first and second screws can be tightly fixed by the protruding and recessed ends.

[0007] According to the present invention, a self-tapping screw with a double countersunk hole has a rubber washer movably connected at the connection between the screw head and the lap joint. This component reduces surface pressure, prevents the seat surface from collapsing, and reduces the likelihood of screw loosening. The rubber washer effectively reduces surface pressure.

[0008] According to the present invention, a self-tapping screw with double countersunk holes includes a radial fixing assembly comprising an elastic element. The side surface of the elastic element is fixedly connected to a connecting post. A fixed sliding block is fixedly connected to the side of the elastic element away from the connecting post. The side of the fixed sliding block away from the elastic element is movably connected to the protruding end. By pulling upwards using these components, the concave end and the convex end disengage. Then, rotating the first screw in the opposite direction causes the connecting post to rotate inside the second screw. This causes the connecting post to drive the elastic element, which in turn causes the fixed sliding block to rotate, thus allowing the fixed sliding block to slide out of the convex end. The elastic element, due to its elastic recovery, moves outwards, compressing from inside the hole.

[0009] According to the present invention, a self-tapping screw with double countersunk holes includes multiple connecting strips arranged symmetrically about the centerline of the second screw, with each connecting strip arranged at an inclined angle. These components, via the connecting strips, secure the inner and outer surfaces of the mating ring, and the oblique arrangement allows drilling debris to slide off from the outside.

[0010] According to the present invention, a self-tapping screw with double countersunk holes is provided with a slag discharge groove inside the second screw rod, which is located below the mating ring. This component prevents debris from accumulating on the outside of the second screw rod, clogging the external threads, and thus preventing loosening at the end.

[0011] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0013] Figure 1 This is a complete structural diagram of the self-tapping screw with double countersunk holes of this utility model;

[0014] Figure 2 This is a side view of the self-tapping screw with double countersunk holes of this utility model.

[0015] Figure 3 This is a structural diagram of the end screw head of the self-tapping screw with double countersunk holes of this utility model.

[0016] Figure 4 This is a partial structural diagram of point A of the self-tapping screw with double countersunk holes of this utility model;

[0017] Figure 5 This is a structural diagram of the radial fixing assembly of the self-tapping screw with double countersunk holes according to this utility model;

[0018] Figure 6 This is a structural diagram of the mating ring of the self-tapping screw with double countersunk holes according to this utility model.

[0019] Legend:

[0020] 1. End screw head; 2. Lap body; 3. First screw; 4. Recessed end; 5. Connecting column; 6. Second screw; 7. Convex end; 8. Elastic element; 9. Fixed sliding block; 10. Face groove; 11. Cross hole; 12. Matching ring; 13. Connecting strip; 14. Slag discharge groove; 15. Bottom sleeve; 16. Rubber gasket. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] Reference Figure 1-6 This utility model discloses a self-tapping screw with double countersunk holes, comprising: a screw head 1, a connecting body 2 fixedly connected to the lower surface of the screw head 1, connecting the screw head 1 to a first screw rod 3 and fixing a rubber washer 16; the first screw rod 3 is fixedly connected to the side of the connecting body 2 away from the screw head 1, which can fix the components together and has the functions of connection and fixation; the end of the first screw rod 3 away from the connecting body 2 is fixedly connected to a recessed end 4; the end of the first screw rod 3 away from the connecting body 2 is fixedly connected to a connecting post 5, which drives the elastic element 8 to... The fixed sliding block 9 moves, and the end of the connecting column 5 away from the first screw 3 is threadedly connected to the second screw 6. One end of the second screw 6 is fixedly connected to the protruding end 7, which is a component used to cooperate with the elastic element 8. A radial fixing component is provided on the outside of the connecting column 5. The external thread of the second screw 6 is connected to the mating ring 12 to discharge debris and connect to the bottom sleeve 15. The mating ring 12 is provided with a connecting strip 13, which is a connecting component. The internal thread of the mating ring 12 is connected to the bottom sleeve 15 to protect the drill bit of the second screw 6.

[0023] The outer side of the end screw head 1 is circular, and the inner side of the end screw head 1 is provided with a face groove 10. The face groove 10 is provided with a cross hole 11, which facilitates the disassembly and installation of the first screw 3 and the second screw 6. A rubber gasket 16 is movably connected at the connection between the end screw head 1 and the lap body 2, which has a protective function and reduces the pressure between the surfaces of the fasteners.

[0024] The concave end 4 is located above the convex end 7. The interior of the convex end 7 and the concave end 4 are engaged during operation. The radial fixing assembly includes an elastic element 8. Through the elastic action of the elastic element 8, the first screw 3 is fixed in the hole. The side surface of the elastic element 8 is fixedly connected to the connecting column 5. A fixing sliding block 9 is fixedly connected to the side of the elastic element 8 away from the connecting column 5. The side of the fixing sliding block 9 away from the elastic element 8 is movably connected to the convex end 7.

[0025] There are multiple connecting strips 13, which are arranged symmetrically about the center line of the second screw 6. The multiple connecting strips 13 are arranged along the inclined angle. The second screw 6 is provided with a slag discharge groove 14 to discharge the drilling debris inside the hole and reduce the accumulation of debris. The slag discharge groove 14 is located below the mating ring 12.

[0026] Working principle: Remove the base sleeve 15 and the mating ring 12, drill a hole in the plate to be fixed, insert the drill bit of the second screw 6 into the hole, align the bottom of the electric screwdriver with the cross hole 11 on the end connector, and rotate the cross hole 11 to rotate the end screw head 1. The rotation of the end screw head 1 causes the first screw 3 and the second screw 6 to move downward along the thread in the hole. When the plate is thick, pull upward to disengage the concave end 4 from the convex end 7. Then, rotate the first screw 3 in the opposite direction to make the connecting column 5 rotate inside the second screw 6, causing the connecting column 5 to move elastically. The component 8 causes the fixed sliding block 9 to rotate, thereby causing the fixed sliding block 9 to slide out from the protruding end 7. The elastic component 8 will move to all sides to recover its elasticity and squeeze from the inside of the hole, so that the first screw 3 and the second screw 6 are tightly connected, expanding the hole at the bottom of the plate. Then, the mating ring 12 is rotated and fitted onto the bottom of the second screw 6, and the bottom sleeve 15 is connected to the inside of the mating ring 12, driving the mating ring 12 to move upward. During the upward movement, the debris of the plate will fall through the groove hole inside the mating ring 12 and fall into the inside of the bottom sleeve 15 along the slag discharge groove 14.

[0027] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A self-tapping screw with a double countersunk hole, characterized in that, include: An end screw head (1) is provided, and a lap body (2) is fixedly connected to the lower surface of the end screw head (1). A first screw (3) is fixedly connected to the side of the lap body (2) away from the end screw head (1). A recessed end (4) is fixedly connected to the end of the first screw (3) away from the lap body (2). A connecting column (5) is fixedly connected to the end of the first screw (3) away from the lap body (2). A second screw (6) is threadedly connected to the end of the connecting column (5) away from the first screw (3). A protruding end (7) is fixedly connected to the end of the second screw (6). A radial fixing component is provided on the outside of the connecting column (5). A mating ring (12) is threadedly connected to the outside of the second screw (6). A connecting strip (13) is provided inside the mating ring (12). A bottom sleeve (15) is threadedly connected to the inside of the mating ring (12).

2. A self-tapping screw with double countersunk holes according to claim 1, characterized in that, The outer part of the end screw head (1) is circular, and the inner part of the end screw head (1) is provided with a face groove (10), and the inner part of the face groove (10) is provided with a cross hole (11).

3. A self-tapping screw with double countersunk holes according to claim 1, characterized in that, The recessed end (4) is located above the protruding end (7), and the interior of the protruding end (7) is engaged with the recessed end (4) during operation.

4. A self-tapping screw with double countersunk holes according to claim 1, characterized in that, A rubber gasket (16) is movably connected at the connection between the end screw (1) and the lap joint (2).

5. A self-tapping screw with double countersunk holes according to claim 1, characterized in that, The radial fixing assembly includes an elastic element (8), the side surface of which is fixedly connected to the connecting column (5), and a fixed sliding block (9) is fixedly connected to the side of the elastic element (8) away from the connecting column (5), and the side of the fixed sliding block (9) away from the elastic element (8) is movably connected to the protruding end (7).

6. A self-tapping screw with double countersunk holes according to claim 5, characterized in that, There are multiple connecting strips (13) and they are arranged symmetrically about the center line of the second screw (6). All of the multiple connecting strips (13) are arranged along an inclined angle.

7. A self-tapping screw with double countersunk holes according to claim 1, characterized in that, The second screw (6) is provided with a slag discharge groove (14) inside, which is located below the mating ring (12).

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