JPH0547518U - screw - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] A large tightening torque and propulsion force can be applied to the screw without damaging the screw head.
A groove with a simple shape is provided on the screw head. If necessary, the groove can be easily capped to prevent dust and tampering. A screw in which a disk-shaped groove 3 concentric with the screw is formed on the upper surface of the screw head 2, and a rectangular groove 4 is further formed at the center of the circular bottom surface thereof as a driving surface for tightening torque. Separately, a disc-shaped stopper that tightly fits into the disc-shaped groove 3 is provided for preventing dust and tampering.

Description

[Detailed description of the device]         [0001]     [Industrial application]   The present invention relates to a fastening screw.         [0002]     [Conventional technology]   Conventionally, as means for applying tightening torque to the screw head, slot, cross hole, hexagon Grooves or holes, such as holes or flower patterns, have been provided as drive surfaces. Also old Since the head has a square or hexagonal outer shape, it has been widely used.         [0003]   In addition, for the purpose of rust prevention, etc. Covering with plastic or plastic membranes has also been widely practiced.         [0004]     [Problems to be solved by the invention]   The slots and cross holes that have been used so far are The bit slips and deviates, and further the screw head and the object to be fastened are damaged or scratched. It was Also, these screws cannot be used with a horizontal turning tool such as a hexagon wrench. That was an inconvenience. Furthermore, in the case of tapping screws and wood screws, it is important to tighten the screws. Load, and these drive surfaces are not easily damaged or difficult to work. Which was flawed.   Also, the screws with square or hexagon heads are compact due to the tightening tools used. It was unsuitable for the purpose of making it compact, lightweight, and streamlined.         [0005]   Screws with groove and protrusion in flower pattern (Product name: Torx and LH-Stix etc. ) Is excellent in terms of strength and function, but because the screw head has a complicated shape, The disadvantage was the high cost of the tool. Also, if you do not have a dedicated tool, definitely Sometimes it was inconvenient because I couldn't tighten or loosen it.         [0006]   The cap that covers the screw head described above is vulnerable to external impacts and has extra space. Since it takes a lot of space, the places where it can be used are limited. Also easily removed by a third party I was afraid.         [0007]     [Means for solving the problem]   In the present invention, the groove has a simple shape. That is, the tip of the driver When you insert the screw into the screw head, it will serve as a guide to hold it coaxially with the screw. Drill a circular disc-shaped groove, and a slightly deeper rectangular groove in the center of the circular bottom surface. The screw drive surface was used. In this way, two grooves with a simple shape are arranged in upper and lower two stages. By making it easier to form the screw head by cold heading, The production cost was reduced. Place the rectangular groove that serves as the screw drive surface close to the point where the load acts. I installed it at the bottom of the screw head.         [0008]   In addition, the present invention does not prevent dust, corrosion, rust, or tampering with the groove of the screw head. For any purpose, it can be easily and tightly fitted into the disc-shaped groove, but not easily removed. A disk-shaped stopper that cannot be used was prepared.         [0009]     [Action]   The rectangular claw on the tip of the screwdriver fits snugly into the rectangular groove above Since both sides of the rectangular claws become the drive surfaces, tighten the screws with the torque Fully communicates. On the other hand, the cylindrical part at the tip of the driver is guided by the inner peripheral surface of the disk-shaped groove on the screw head. Moreover, since it is captured, there is no risk of slipping and deviation during tightening work. In addition, the cylindrical part uniformly gives a stable propulsive force perpendicular to the bottom surface of the disc-shaped groove. Therefore, the propulsive force required for tapping work can be applied simultaneously with the tightening torque. It         [0010]   Also, the disc-shaped stopper tightly fitted into the disc-shaped groove is a thin sphere with a smooth surface. Since it is a surface, the entire surface of the screw head has a gentle shape with no gaps or edges. Make a state. Therefore, dust is unlikely to collect and is easy to clean.         [0011]     [Example]   An embodiment will be described with reference to the drawings.   FIG. 1 shows an embodiment of the screw of the present invention and a tightening tool used for the screw. It Unlike the conventional hexagon socket head cap screw, the illustrated screw (bolt) has a Instead of a hexagonal hole, a shallow disk-shaped groove 3 and a slightly deep rectangular groove 4 are drilled vertically. There is. The tightening tool to be used is a bit screw type power fastener and a manual driver. -Although it may be a manual driver or wrench, Explain. The tip of the driver 7 is a cylindrical part 5 and a rectangle located in the center of the front surface. Each of them has a tab 6 and a disc-shaped groove 3 and a rectangular groove 4. It is sized to fit exactly together.         [0012]   As shown in FIG. 2, since the bolt 1 is screwed into the fastening object 8, the tip of the driver 7 When the end is inserted into the upper surface of the screw head 2 and fitted and then tightened, the axial center of the bolt 1 And the axis of the driver 7 are aligned. Then, the cylindrical portion 5 is captured in the inner peripheral surface of the disc-shaped groove 3, and further, both of the rectangular pawls 6 are caught. Since the side faces are in close contact with both sides of the rectangular groove 4, The tightening torque applied is completely transmitted to the head 2.   In this case, unlike the two-point drive of the slotted screw, the two sides of the rectangular groove 4 Since it is surface driven, there is no risk of damage to the screw head.         [0013]   FIG. 3 shows an embodiment of a tapping screw according to the present invention. Tapping screw Cuts the screw while expanding the prepared hole to the fastening object, so it is extremely large on the head. Receive a load. Therefore, unlike tightening work with bolts and nuts, In addition to rolling force, great propulsion must be given.   Also in this embodiment, the rotational force is on both sides of the vertical rectangular groove 4 provided at the bottom of the head 2. Since it is given to the surface, it can withstand a large load, and the necessary propulsive force is the disc-shaped groove 3. Since it is given a uniform and stable posture on the bottom surface, reliable tapping work is possible. .         [0014]   Figure 4 shows how to apply a larger tightening torque to the screw of the present invention by manual tightening. An example of the tightening tool used in this case is shown. This tightening tool has a hexagon socket 10. One end of the hexagonal hole 10 and the tip end composed of the cylindrical portion 5 and the rectangular pawl 6 provided on the upper surface It is configured with a hexagonal wrench 11 that is used by fitting. This tool, which can be tightened horizontally with a large force, has sufficient space above the screw. Since it is also possible to fasten a place that does not exist, it is extremely advantageous for making the device compact.         [0015]   FIG. 5 shows the present invention in which the disc-shaped plug 13 according to claim 2 is fitted into the disc-shaped groove 3. A round-headed screw according to the plan is shown.   After tightening the round countersunk screws 12 on the objects 8 and 8'to be fastened, the disk-shaped stopper 13 When it is fitted tightly into the plate-shaped groove 3, the top surface of the stopper 3 is close to the original circular arc of the round head. If the shape of the screw head is not good, the surface of the screw head will not have any gaps or edges It will be a kana.         [0016]     [Effect of device] Since the present invention is configured as described above, it has the following effects. It   From the viewpoint of production cost, the disk-shaped groove 3 and the rectangular shape provided on the head 2 of the screw Both groove 4 has a simple shape, and it requires a sharp edge for its function. It is not required, and since it is in two stages, the forming of the screw head by cold heading is relatively high. It is relatively easy, and the life of dies and bunches can be used for a long time. Can be manufactured at a lower cost than sama and hexagon socket screws.         [0017]   In terms of function, the screw of the present invention is a tapping screw or wood If you use the above-mentioned tightening tool, do not damage the screw head and Since both attachment torque and propulsion force can be applied, conventional slotting, cross holes, It has better workability than screws with hexagonal heads.         [0018]   The screw of the present invention normally uses the above tightening tool, but should this tool be prepared Even if there is not, tighten and loosen the work temporarily with an ordinary screwdriver. Since it is possible to operate it, it is safe to operate and maintain the equipment.         [0019]   When the disc-shaped plug 13 is fitted into the screw of the present invention after fastening, as described above, Not only does it prevent dust, corrosion, and rust from the groove 3 and the rectangular groove 4, but it also prevents tampering. Be useful. Also, if the plug 13 is made beautiful and colorful, screws are used. Add beauty to interior equipment.         [0020]   The screw of the present invention is made of a material such as ceramic that cannot be plastically processed by pressing or forging. Since the material can be easily manufactured from the round bar by cutting, for example, ceramic gas It is suitable as a screw for a turbine, especially for a bolt to be used by sinking.     

BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] A perspective view showing a bolt 1 which is one embodiment of the present invention and a driver 7 used for the bolt 1. FIG. 2 is a cross-sectional view showing a state where the bolt 1 is tightened with a driver 7. [FIG. 3] A side view (a main part is a sectional view) and a plan view showing a tapping screw 9 which is an embodiment of the present invention. FIG. 4 is a perspective view showing an embodiment of a tightening tool for lateral rotation used for the screw of the present invention. FIG. 5 is a sectional view showing a place where the plug 13 described in claim 2 is fitted into the round flat head screw which is an embodiment of the present invention. [Explanation of Codes] 1. ． Bolt 2. ． head
3. ． Disc-shaped groove 4. ． Rectangular groove 5. ． Column
6. ． Rectangular claw 7. ． Driver 8, 8 '. ． Fastening object
9. ． Tapping screw 10. ． Hexagonal hole 11. ． wrench
12. ． Round flat screw 13. ． plug

Claims (1)

[Claims for utility model registration] [Claim 1] A disk-shaped groove concentric with the screw is drilled in the upper surface of the screw head, and a rectangular shape is formed in the center of the circular bottom surface of which a driving surface for screw tightening torque is formed. A screw characterized by having a groove. [Claim 2] The screw according to claim 1, wherein a disc-shaped plug having a size and shape that gently fills the disc-shaped groove is tightly fitted.