JP3171573U - Special recess screw to prevent tampering - Google Patents

Abstract

A head-shaped screw that cannot be removed without a dedicated tool is provided.
A screw for fixing a material to be fixed to a fixing portion, and a top surface of a screw head 11 has a single round hole 10 which is a recess eccentric from a central portion, and a tool is attached to the screw head. The screw is constructed by fitting to the outer periphery of the part and the hole, and removing by turning the support and turning at these two points. The dedicated tool has a pair of shapes with the screw and depends on the shape of the screw. Thereby, it becomes difficult to perform unnecessary removal by a third party.
[Selection] Figure 1

Description

  The present invention mainly relates to a technique for preventing unintentional removal of an attachment due to the purpose of preventing unnecessary removal of screws by a third party.

  Originally, the screw has been used to fix the member. Basically, the screw is formed of a screw portion and a head on a spiral, and a rotational force must be generated in order to exert a fastening force. Normally, a screw such as a screwdriver or a spanner is used to apply a rotational torque to the screw to enable fastening. Therefore, there are crosses and hexagonal holes in which the screwdriver is inserted, and the screw heads are hexagonal. However, since anyone can loosen with a tool, it has become a cause for removal by mischief of a third party.

  Japanese Patent Publication No. 2007-2111948

  Screws come in a variety of shapes, such as those that are turned by hand or those that are tightened with a tool such as a screwdriver, wrench, or spanner, and can be easily tightened or removed. However, it can be removed, causing unnecessary removal by a third party. Unnecessary removal can lead to theft or accidents in structures. In order to prevent this unnecessary removal, it is possible to make it difficult to remove by a special recess while using a screwdriver.

  In order to make it difficult for a third party to remove the screw, the present invention devised a screw that is difficult for a third party to turn. As a means, torque is applied to the screw by the recess with one eccentric hole without using a general recess such as a cross hole, a hexagonal hole, or a slot that is available as a general distribution product. Due to this special recess structure, tightening and removal can only be performed with a dedicated tool. Also, use a dedicated tool according to the screw diameter.

  The present invention has an effect of preventing unnecessary screw removal by a third party.

It is a figure which shows the structure of a screw. It is a figure which shows the structure of the tool which gives a torque to a screw. It is a figure which shows embodiment of a screw and a tool.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing the configuration of a screw having a special recess. FIG. 2 is a diagram illustrating a configuration of a tool for applying a rotational torque to the special recess. FIG. 3 is a diagram showing an embodiment of a screw and a tool.

[Constitution]
As shown in FIG. 1, the screw in the present embodiment is configured in a state in which the head and the screw portion are integrated. A special recess, which is the core of the present invention, is arranged on the upper side of the head. Hereinafter, each configuration will be described in detail.

  The screw 1 shown in FIG. 1 is a view as seen from the upper side and (b) as seen from the side. The configuration includes a screw head 11 and a screw portion 12. In FIG. 1, the threaded portion is a male screw, but may be a female screw. As shown in the diagram (a), the torque transmitting round hole 10 is arranged at a position eccentric from the center.

  FIG. 2 is a dedicated tool for transmitting rotational torque to the torque transmitting round hole of the screw shown in FIG. 1, wherein (a) is an upper part, (b) is a side part, and (c) is a view seen from the lower part. It becomes. As shown in FIG. 5A, the torque transmission pin 31 is arranged in a state protruding from the center portion of the torque transmission round hole 10 of the screw shown in FIG. Further, the side wall 32 is arranged with a slightly larger inner diameter than the outer periphery of the screw shown in FIG. When viewed from (b), the socket insertion portion 33 is configured to fit into a driver socket for turning by hand or a hexagon socket for an electric tool.

  The principle of applying rotational torque is that the torque transmission pin 31 of the dedicated tool of FIG. 2 is fitted into a hole that is eccentrically formed in the screw head 11 of FIG. Can make 3 or more fulcrum points. Thereby, the torque transmission pin has a structure capable of transmitting torque to the central screw portion 12. If the eccentric hole is other than the center, torque can be transmitted.

  The relationship between the screw and the dedicated tool depends on the head diameter of the screw and the position and diameter of the torque transmitting round hole arranged on the screw. Therefore, a dedicated tool and a screw are configured as a combination, thereby exhibiting an effect of preventing removal by a third party.

  Next, an embodiment of the above screw will be described with reference to FIG.

  FIG. 3 is an implementation diagram when the fastening object T and the fixed object K are tightened by the screw 1 of the present invention. The torque transmission pin 31 of the dedicated tool is fitted into the round hole 10 for torque transmission of the screw, and the side wall 32 is in contact with the outer periphery of the screw. The torque transmission pin can be tightened by applying rotational torque to the screw with the side wall as a fulcrum. Due to the special recess shape with one round hole, it cannot be turned because it can only support one point with a normal tool or pin.

  The dedicated tool is configured so that it can be fitted into a hexagon socket S such as a hand turning or electric tool. The dedicated tool has a bit shape in the figure, but may be a tool integrated to the handle.

  In addition, special tools must be used when removing. The dedicated tool has a pair of shapes with the screw and depends on the shape of the screw. This makes it difficult for a third party to perform unnecessary removal.

An object of the present invention is to prevent unnecessary screw removal by a third party, and it can be applied to various exposed screws and has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Screw 10 Torque transmission round hole 11 Screw head 12 Screw part 20 Dedicated tool 31 Torque transmission pin 32 Side wall 33 Socket insertion part

Claims (3)

A special screw that secures the material to be fixed to the fixed part and can transmit torque through a single hole in the head. 2. The special screw according to claim 1, which has a purpose of preventing tampering by combining a hole position of a screw head and a tool. The special screw according to claim 1, wherein the screw portion is a nut that is a female screw member or a bolt that is a male screw member.

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