Rock drill bit having retrac teeth and method for its manufacturing
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 17, 2002
Grant Date -
Sep 6, 2001
app pub date -
Mar 2, 2001
filing date -
Mar 2, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rock drill bit for percussive drilling, especially top hammer drilling, includes a bit head provided with front rock crushing buttons and a skirt. The bit head is provided with a number of grooves formed in the outside of the skirt and extending in the axial direction of the drill bit. Protruding lands are defined between the grooves, which likewise extend in the axial direction. Axially rearward ends of at least some of the lands are formed with retrac teeth. Each retrac tooth has a cutting edge extending along an outer circumference of the skirt.
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