Crime prevention screw, embedding material of screw head, screw-use crime prevention seat and crime prevention screw set
OwnerMamoru Uenoinventor
Life of this patent
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Abstract
A crime preventing screw having a recessed portion for receiving the end of a driving tool. The recessed portion is formed with a recessed engagement portion at a partial lace of an inner wall. An embedding material for embedding in the recessed portion of the screw has a shape and size such that it can be buckled in and can be embedded in the recessed portion.
Claims19
A crime prevention screw wherein a recessed portion which is composed of a square socket, a hexagon socket, a cross socket or a slot for engaging and rotating an end portion of a tool such as a square bar spanner or a driver is formed on a screw head, and a recessed engagement portion is formed on a partial place of an inner wall of the recessed portion such that one of an expanded portion formed by buckling a part of an embedding material for embedding in the recessed portion and a protrusion to which a force is applied to the side of the embedding material for embedding in the recessed portion comes into the engagement portion, whereby the embedding material is prevented from coming off.
A crime prevention screw, wherein a recessed portion which is composed of a square socket, a hexagon socket, a cross socket or a slot for engaging and rotating an end portion of a tool such as a square bar spanner or a driver is formed on a screw head, and a recessed engagement portion where its inside is wider than an entrance is formed on a bottom portion of the recessed portion such that one of a protrusion formed at an end of an embedding material for embedding in the recessed portion and one end portion of a connecting member for connecting the embedding material to the screw head comes into the engagement portion, whereby the embedding material is prevented from coming off.
Dependencies are inferred from the claim text.