Anti-theft screw bolt and screw nut, and socket-wrench
The utility model relates to an anti-theft screw bolt, a screw nut, and a socket spanner, wherein, a screw rod and screw threads of the screw bolt and the screw threads of the screw nut are still provided with standard structures. The anti-theft screw bolt, a screw nut, and a socket spanner are char...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | The utility model relates to an anti-theft screw bolt, a screw nut, and a socket spanner, wherein, a screw rod and screw threads of the screw bolt and the screw threads of the screw nut are still provided with standard structures. The anti-theft screw bolt, a screw nut, and a socket spanner are characterized in that a head part of the screw bolt and the shape of the screw nut are both spherical surface bodies. A plurality of spiral grooves which are provided with intersectant spherical surfaces on the upper part and on the lower part and parallel spiral surfaces on the left and one the right are uniformly distributed on the spherical surface bodies. The inner part of the head part of the socket spanner is a spherical surface. A plurality of cylinder dummy clubs with spiral bars, which are corresponding to the spiral grooves on the spherical surface bodies are uniformly distributed on the spherical surface. The end of the socket spanner is a casing tube with four symmetrical through holes. A fastener is a disposable connection, which only can be screwed up, but can not be unscrewed and disassembled, and has an anti-theft function. |
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