Title:
Semi-reverse thread removal screw
Document Type and Number:
Japanese Patent JP6347810
Kind Code:
B2
Abstract:
A semi-left-hand-thread-removal screw, comprising a screw end head and a bolt, wherein a sink hole is provided on the screw end head, a lower portion of the sink hole is an inscribed polygon structure or an I-shaped structure, a thread which is opposite to the bolt is provided on an upper portion of the sink hole, the inscribed polygon structure is an inscribed hexagon. Preferably, the invention has the following characteristics and use ways: the semi-left-hand-tread-removal screw can be screwed in with a common inscribed hexagon screwdriver and an inscribed hexagon structure thereof which are embedded into each other; the screw can be unscrewed with a left-hand-thread screwdriver which is matched with a left-hand-thread structure thereof and screwed in the left-hand-thread structure thereof, after the left-hand-thread screwdriver is screwed in tightly, the screwdriver is continuously co-rotated and then the screw may be unscrewed. Therefore, when the screw of the invention is unscrewed, the screw may be rapidly and effectively unscrewed no matter whether a screw cap groove is slipped. The invention has a reasonable structure, and may effectively prevent the screw from slipping when the screw is unscrewed.
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Inventors:
Lee Chogei
Maple Son
Maple Son
Application Number:
JP2016165441A
Publication Date:
June 27, 2018
Filing Date:
August 26, 2016
Export Citation:
Assignee:
Lee Chogei
International Classes:
F16B37/04; F16B23/00; F16B35/00
Domestic Patent References:
| JP2005163968A | ||||
| JP10512348A | ||||
| JP7127618A | ||||
| JP64026012A | ||||
| JP58016417U |
Foreign References:
| US5857816 | ||||
| US9044843 |
Attorney, Agent or Firm:
Baba Shiba
Karakama Mutsumi
Karakama Mutsumi