CN104019105A - Bolt - Google Patents

Abstract

The invention discloses a bolt, which includes an integrally formed screw rod and a bolt head. A thread counterbore coaxial with the screw rod is arranged on the upper surface of the bolt head far away from the screw rod. In the opposite direction, there is an umbrella-shaped gasket on the bottom surface where the bolt head and the screw are connected. After the bolts are tightened, a protective cover made of plastic is placed on the head of the bolts. In the present invention, a threaded counterbore is provided on the upper surface of the bolt head. When the bolt head of this type of bolt is worn out and cannot be loosened, another bolt can be screwed into the threaded counterbore. The direction of rotation of the threaded counterbore is opposite to that of the screw. When the bolt is screwed into the threaded counterbore with force, the failed bolt will be loosened, making it easy to replace with a new bolt.

Description

a bolt

technical field

The invention relates to a bolt and belongs to the technical field of bolts.

Background technique

As a fastener for object connection, bolt is widely used in various instruments. During the inspection and replacement of the instrument, the bolts are repeatedly tightened and loosened. As a result, the bolts wear more seriously. After the bolt heads of some bolts are clamped many times, their edges and corners will become rounded. Even if you want to replace new bolts, it is difficult to twist the entire bolt at this time when using a wrench or other tools to clamp the bolt head.

Contents of the invention

The object of the present invention is to provide a bolt which can be unscrewed through its threaded counterbore in case of failure of the bolt head and which does not require additional washers in use.

The technical scheme of the present invention: a bolt, including an integrally formed screw rod and a bolt head, a thread counterbore coaxial with the screw rod is arranged on the upper surface of the bolt head far away from the screw rod, and the thread direction of the thread counterbore hole is the same as that of the screw rod The direction of the thread is opposite. There is an umbrella gasket on the lower bottom surface where the bolt head and the screw are connected. The lower bottom surface of the umbrella gasket is an arched surface that is concave inward. Above the draw-in slot, after the bolts are tightened, a protective cover made of plastic is covered on the bolt head.

For the above-mentioned bolt, the diameter of the threaded counterbore is 0.5-1 times the diameter of the screw rod.

For the above-mentioned bolt, the depth of the threaded counterbore is 0.8-1.2 times the thickness of the bolt head.

For the above-mentioned bolts, the locking groove is an oblique locking groove, and its oblique direction is the same as the direction of rotation of the thread of the screw rod.

Beneficial effects of the present invention: the present invention provides a threaded counterbore on the upper surface of the bolt head, and when the bolt head of this type of bolt is worn out and cannot be loosened, another bolt can be used to screw in In the threaded counterbore, since the direction of rotation of the threaded counterbore is opposite to that of the screw, the failed bolt will be loosened during the process of forcefully screwing the bolt into the threaded counterbore, so that it is easy to replace the new bolt; During use, the lower bottom surface is deformed after contact with the surface of the part, resulting in elastic deformation force, which makes the lower bottom surface of the bolt head and the surface of the part closely fit together; and the lower bottom surface of the umbrella gasket is set There is an oblique slot, and the oblique direction of the slot is the same as that of the screw. When the screw is screwed in, the slot will be stuck on the surface of the part, and the friction between the bolt and the part will become larger, thus avoiding the vibration of the bolt. In more serious cases, it is easy to fall off when used, and no additional gasket is required during the installation process, which saves the process and costs; and the protective cover is provided to prevent the bolt head from being damaged for a long time when it is used in an outdoor environment. After exposure, it is easy to be rusted and damaged. Second, to prevent rainwater from entering the threaded counterbore, the threaded counterbore is rusted and damaged. When the threaded counterbore needs to be used to loosen the bolt, the bolt countersink cannot be used. The bolt of the present invention has made some slight structural adjustments on the existing structure, but has relatively strong practicability and good use value.

Description of drawings

Accompanying drawing 1 is the main view structure schematic diagram of the present invention;

Accompanying drawing 2 is the top view structural representation of the present invention;

Reference signs: 1-screw, 2-bolt head, 3-thread counterbore, 4-umbrella gasket, 5-card slot, 6-protective cover.

Detailed ways

Embodiment of the present invention: a bolt, as shown in accompanying drawings 1-2, includes an integrally formed screw 1 and a bolt head 2, and on the upper surface of the bolt head 2 away from the screw 1 is provided a The threaded counterbore 3 of the shaft, the thread direction of the threaded counterbore 3 is opposite to the thread direction of the screw 1, and the lower bottom surface where the bolt head 2 is connected with the screw 1 is an umbrella-shaped gasket 4, and the lower surface of the umbrella-shaped gasket 4 The bottom surface is an arched surface concave inward, and the lower bottom surface of the umbrella-shaped gasket 4 is provided with more than one draw-in groove 5. After the bolts are tightened, a protective cover 6 made of plastic is covered on the bolt head 2.

When the new bolt is used, during screwing in of the screw rod 1, the umbrella gasket 4 on the lower bottom surface of the bolt head 2 will contact the surface of the part. Since the lower bottom surface of the umbrella gasket 4 is an arched surface, force is After being screwed in, its lower bottom surface is easily deformed, and fits the surface of the part, increasing the friction between the bolt and the part, and a card slot 5 is also provided on the lower bottom surface of the umbrella-shaped gasket 4, and the umbrella-shaped gasket During the contact and deformation process between the piece 4 and the part, the slot 5 will be stuck into the surface of the part, thereby making the connection effect more firm and avoiding the loosening of the bolt when the vibration is severe. After the bolt is used for many times, the edges and corners of the bolt head 2 will be gradually worn away. When the bolt needs to be loosened, it is difficult to loosen the bolt by clamping the bolt head 2 with a wrench or other fixture. At this time, you can use a The screw is screwed into the threaded counterbore 3. Since the thread direction of the threaded counterbore 3 is opposite to that of the screw 1, the bolt will be loosened during the continuous tightening of the screw, and then replaced with a new bolt. That's it. Because the bolt is exposed to the outside for a long time, especially when used in an outdoor environment, the bolt is easily affected by rainwater and is rusted and damaged. Therefore, a protective cover 6 supported by plastic is placed on the bolt head 2 to protect the bolt head 2. Can rainwater effect, can prevent rainwater from entering in the threaded counterbore 3 and go, makes the threaded counterbore 3 get rusty and damaged.

During the manufacture of the bolt, the diameter of the threaded counterbore 3 is 0.5-1 times the diameter of the screw 1 , and the depth of the threaded counterbore 3 is 0.8-1.2 times the thickness of the bolt head 2 . One is to ensure that the structure of the threaded counterbore 3 will not affect the performance of the bolt, and the other is to avoid that if the diameter of the threaded counterbore 3 is too small and the depth is too shallow, the screw will easily slip and fail during screwing in, making it difficult to play a role.

The slot 5 can be an oblique slot during the manufacturing process, and its oblique direction is the same as the direction of rotation of the thread of the screw rod 1 . In this way, during the screwing-in process of the screw rod 1 , its oblique slot will be continuously snapped into the surface of the part, so that the contact between the bolt and the part is better.

Claims (4)

1. A bolt, characterized in that: it comprises an integrally formed screw rod (1) and a bolt head (2), and a bolt head (2) upper surface away from the screw rod (1) is provided with a The threaded counterbore (3) of the shaft, the thread direction of the threaded counterbore (3) is opposite to the thread direction of the screw (1), and an umbrella-shaped gasket is formed on the bottom surface where the bolt head (2) is connected to the screw (1) sheet (4), the lower bottom surface of the umbrella gasket (4) is an inwardly concave arched surface, and more than one card slot (5) is opened on the lower bottom surface of the umbrella gasket (4), after the bolts are tightened , Cover into a protective cover (6) made of plastics on the bolt head (2). 2. The bolt according to claim 1, characterized in that: the diameter of the threaded counterbore (3) is 0.5-1 times the diameter of the screw (1). 3. The bolt according to claim 1, characterized in that: the depth of the threaded counterbore (3) is 0.8-1.2 times the thickness of the bolt head (2). 4 . The bolt according to claim 1 , characterized in that: the clamping groove ( 5 ) is an oblique clamping groove, and its oblique direction is the same as the helical direction of the thread of the screw rod ( 1 ).