| 摘要 |
An automatic screw fastener which automatically fastens a bolt or the like mounted on a mounting member made of metal or the like into which nails and the like are hardly driven, comprising a casing (2), a rotor (4) placed rotatably and vertically movably in the casing (2), a biasing member (5) connected to the rotor (4) and the casing (2), and a member for covering the entire casing (2), with mounting pieces (71) provided on the lower end of the casing (2). The rotor (4) has an engagement portion (41) which is provided on the inner periphery thereof and can engage non-rotatably with a member (n) being fastened and a detention portion (42) which is provided on the outer periphery thereof and can detain the casing (2) non-rotatably. The casing (2) is biased downward by causing the rotor (4) detained to the casing (2) to engage with the member (n). Accordingly, the detention of the casing (2) with the rotor (4) is released to permit turning of the casing (2), so that the mounting pieces (71) enter mounting piece receiving portions (82) of a washer member (8) provided below the member (n) to enable the casing (2) to be secured to the washer member (8) and keep the rotor (4) in a state in which the member (n) is biased in the fastening direction.
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