CN2249842Y

CN2249842Y - Anti-loosen screw

Info

Publication number: CN2249842Y
Application number: CN 96207262
Authority: CN
Inventors: 刘树连
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-03-29
Filing date: 1996-03-29
Publication date: 1997-03-19
Anticipated expiration: 2006-03-29

Abstract

The utility model relates to a screw capable of preventing from loosening. The utility model is characterized in that the end face of a screw head is provided with single line-shaped or intercrossed slots, wherein, the stress side face in the screwing direction of the end face slots of the screw head is a rectangular face, and the side face in the loosening withdrawal direction opposite to the screwing direction is a reverse inclined face. When the utility model is screwed by a screw driver to rotate, since the side face of the slots at the end face of the screw head in the screwing direction is a rectangular face, the utility model is under stress and screwed; inversely, when the screw driver is rotated in the opposite direction, since the side face of the slots at the end face of the screw head in the loosening direction is a reverse inclined face, the stress is decomposed so that the screw is free from force in the loosening direction so as not to be loosened. The utility model overcomes the shortage of an existing screw which is easy to loosen by the screw driver.

Description

Can prevent the screw that unscrews

The utility model relates to a kind of fastening piece, refers to a kind of screw of unscrewing of preventing especially.

As everyone knows, screw has the function with two fixed one of object.General screw terminal end face has in-line or two cross one another grooves, for screwing with screw-driver, also can unclamp with screw-driver at any time.Therefore, for some important purposes, as the lid of safe deposit box, one to being to adopt first-class tapered end to pin, but the fulcrum of Cover opening must be locked in so-called butterfly hinge pin on the casing by the external application screw.Therefore, with the screw that screw-driver screws, same available screw-driver revolves resigns from office, and this shows that both the cover lock of the more difficult breakdown of use was also dangerous, and of no avail.

The purpose of this utility model provides a kind of screw of unscrewing of preventing, thereby after overcoming existing screw and screwing with screw-driver, the shortcoming that available again screw-driver unclamps can not be unlocked the tapered end that is installed on door, window, the casing, thereby guarantees that article can stolenly not lose.

The visitor is in the technology of the present utility model: a kind of screw of unscrewing of preventing, the screw terminal end face has in-line or cross one another groove, the stressed side that screws direction that it is characterized in that described screw terminal end face groove is the right angle face, is contra bevel and pine on the other side moves back the side of direction.

During with screw-driver turn the utility model,, make the utility model stressed and screwed because the screw terminal end face is the right angle face in the groove side that screws direction; Otherwise, when opposite direction turn screw-driver,, screw is not stressed unscrewing direction and power decomposed because the screw terminal end face is contra bevel in the groove side that unscrews direction, make the utility model can be not released, thereby overcome the shortcoming that the easy-to-use screw-driver of existing screw unclamps

The utility model embodiment is described with reference to the accompanying drawings as follows:

Fig. 1 is the utility model embodiment plane structure schematic representation.

Fig. 2 is the wherein sectional schematic diagram of a groove of the utility model embodiment mild steel machine screw structure.

Fig. 3 is the wherein sectional schematic diagram of a direction groove of the utility model embodiment self tapping screw structure.

1 screw terminal, 2 groove right angle faces, 3 groove contra bevels.

Each of the utility model embodiment screw terminal is after groove is blocked by screw-driver, its stressed side that screws direction is the right angle face, consult Fig. 1, Fig. 2, and promptly to unscrew a side of direction be contra bevel in a side on the other side, like this, and when using screw-driver to screw screw, can only block screw screwing direction, and unscrew a side of direction owing to be contra bevel, therefore can't block screw, thereby just screw can not be unclamped.

Shown in the above accompanying drawing, only be the utility model preferred embodiment, the utility model embodiment also has the screw of other different shapes certainly.Every modification of doing according to this creation spirit all should belong to visitor in the technology of the present utility model.

From the above mentioned, the utility model can prevent that being moved back gomphiasis opens, and has overcome the maximum disadvantage that existing screw is easily unclamped by screw-driver, its creative, practicability.

Claims

1, a kind of screw of unscrewing of preventing, the screw terminal end face has in-line or cross one another groove, it is characterized in that the stressed side that screws direction of described screw terminal end face groove is the right angle face, is contra bevel and pine on the other side moves back the side of direction.