JP2003301826A - Screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw which can be driven easily but is hard to be released, and can be securely released, thus avoiding the degradation of safety when used for crime-preventing purposes, unlikely to general screws that must be easily driven and released. <P>SOLUTION: This screw has a head of such a form that it can be turned by a flathead screwdriver in a driving direction only. For releasing, a hole is bored by a drill in the head till a groove for a hexagonal wrench is exposed at the tip of the screw in a screw head side. By inserting the hexagonal wrench to the groove, the screw can be released. It can thus be driven easily, and for releasing it, a hard process of boring a hole by a drill in the head is required. Safety with relation to crime prevention can thus be improved without deteriorating the performance of the screw. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw which is a component for fixing an object, and when tightening the screw, it can be easily carried out by turning a minus driver, and turning the minus driver in the opposite direction. Even if it is impossible to loosen it, it is a screw for the purpose of crime prevention that is used in places that should not be easily removed.

[0002]

2. Description of the Related Art A conventional screw that can be rotated only in one direction (application number: Japanese Patent Application No. 6-172691) has two grooves on the screw head, which are flat catches for a driver corresponding to a Phillips screw. By making a gentle slope on one side of this groove, the screw can be turned in the tightening direction, and the screw can be idle in the loosening direction. there were.

[0003]

Since the screw which can be turned only in one direction in the prior art corresponds to the plus driver in the slope surface which slips when turned in the loosening direction, the plus driver is turned while pushing it strongly. The slope itself, which was originally intended to slide, plays the role of a screw thread,
It was possible to overcome the force with which the Phillips driver was pushed upwards by the slope, and it was possible that the screw would loosen because it deviated from the purpose of spinning in the initial loosening direction.

Further, since it corresponds to a plus driver, it is possible to forcefully insert a minus driver into the groove of the screw head to newly create a catch for the minus driver and loosen it, for the purpose of crime prevention. The safety was low. Furthermore, if you try to loosen the screw while pressing the Phillips screwdriver hard from above and crush the slope part, it will be impossible to loosen the screw, and you can loosen it when you want to loosen it, depriving the screw itself. Will be lost.

Above all, since it is used for the purpose that it cannot be loosened easily, there was no use as a crime prevention screw whose purpose is to be able to remove it.

[0006]

[Means for Solving the Problems] In solving the above problems, the present invention possesses two hooks on a vertical surface which receive a force when tightening corresponding to a minus driver, and rotates in a direction to loosen the minus driver. By making the slope surface that slips when you do so flat with no catches, it will be impossible to loosen even if you rotate it in the direction of loosening while pushing with any strong force.

When the screw is loosened, a hole is drilled in the screw head, and if a groove corresponding to the hexagon wrench at the tip of the screw part on the screw head side appears, the hexagon wrench is inserted and the screw is securely screwed. We are trying to solve the problem by making it possible to loosen.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings based on an example of the embodiment. FIG. 1 is an external view of a screw according to an embodiment of the present invention. When a screwdriver is turned in the tightening direction, there are two hooks on a vertical surface that receive a force, and about 180 hooks from one hook to the next hook.
It has a flat slope in the range of degrees. Compared to the grooved slope of the prior art in Fig. 6, it has a flat slope, so while pushing the flathead screwdriver from above,
Even if you turn it in the loosening direction, you can see that it is impossible to loosen it because there is no place to get caught.

This screw is composed of the screw head portion of FIG. 2 and the screw portion of FIG. As you can see in Fig. 3, there is a nut-shaped groove on the back of the screw head, and insert the one with the hexagon wrench compatible groove at the tip of the screw part in Fig. 4 into one groove before using it. , It has a double structure of the screw head used when tightening and the screw part used when loosening.

When tightening, turn the screw head in the tightening direction with a flat head screwdriver. Also, when loosening, make a hole in the screw head with a drill, and if a groove corresponding to a hexagon wrench at the tip of the screw part on the screw head side appears,
Insert a hexagon wrench into the groove and turn it in the loosening direction to loosen the screw.

Comparing the external view of the screw according to the present invention with the external view of the screw according to the prior art shown in FIG. 6, the shape of the screw head according to the present invention is simpler. Therefore, the mold used to create this shape is cheaper in the present invention in terms of the mold design cost and the cost of the mold itself.

[0012]

As shown in the embodiments, it is impossible to loosen a screw that can be turned only in one direction even if a minus driver is turned in the loosening direction, which is highly safe for crime prevention purposes. Also, it is a property of the screw that it can be loosened when you want to loosen it, you can loosen it by drilling a hole in the screw head and using the groove of the hexagon wrench at the tip of the screw part on the screw head side. It is also suitable for crime prevention without losing the original properties of the screw.

[Brief description of drawings]

FIG. 1 is an external view of a screw of the present invention.

FIG. 2 is a diagram of a screw head of the present invention.

FIG. 3 is the back side of the screw head of the present invention.

FIG. 4 is a diagram of a screw portion of the present invention.

FIG. 5 is a sectional view of the screw of the present invention.

FIG. 6 is an external view of a conventional screw that can be turned only in one direction.

[Explanation of symbols]

1 Vertical hook and flat slope 2 screw head 3 screw part 4 screw head 5 Nut-shaped groove on the back side of the screw head 6 Back of screw head 7 Groove compatible with a hexagon wrench (the end with the groove has the groove) 8 screw part 9 Screw head cross section 10 Hexagon wrench compatible groove cross section 11 Sectional view of screw part 12 screw head 13 screw part 14 Groove composed of vertical surface and slope surface

Claims (3)

[Claims] 1. The screw head has two hooks on a vertical surface that receives a force with a flat head screwdriver in only one direction, and a slope is formed from the vertical surface to the adjacent vertical surface. A screw that can be turned only in one direction and cannot be turned in the opposite direction. 2. A screw characterized in that a groove is formed at the tip of the screw portion so that the screw can be turned with a hexagonal wrench or other tool, and the groove can be turned with a hexagonal wrench or other tool. 3. A screw comprising the screw head of claim 1 and the screw part of claim 2, wherein the screw head is used for tightening, and the groove at the tip of the screw is used for loosening. A screw characterized by being loosened.