10-11-2017 дата публикации
Номер: KR101796425B1
The present invention relates to a hammer bit having a cam moving type-diameter expandable bit, and more specifically, to a hammer bit having a cam moving type-diameter expandable bit, which has been invented to secure rapidity of diameter expanding work, as well as to reduce a construction period and save costs. According to the configuration of the present invention, the hammer bit having a cam moving type-diameter expandable bit comprises a connection shaft (20), a bit housing (40), a fixing pin (50) and a plurality of diameter expandable bits (60). The connection shaft (20) has a shaft (21) formed at an upper part, has a driven shaft support part (24) formed at a lower part thereof, and has a plurality of movable cams (30) installed at equal intervals, and has a compressed air moving path (25) formed at the center of the inside thereof in a longitudinal direction. The bit housing (40) has a strike surface (41) formed on a lower surface thereof, has an air branching mechanism (42) formed ...
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