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Rotatable cutting bit assembly with wedge-lock retention assembly

  • US 5,996,714 A
  • Filed: 07/15/1997
  • Issued: 12/07/1999
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Fees
First Claim
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1. A rotatable cutting bit for engaging an earth strata, the cutting bit comprising:

  • a bit body having a forward end and a rearward end, the bit body containing a seat at the forward end thereof, and the bit body containing a bore intersecting the seat wherein a bore wall defines the bore;

    a cutting insert being received by the seat wherein the cutting insert presents a side surface facing the bore;

    a wedge having an axially forward portion and an axially rearward portion, the axially forward portion providing a generally longitudinal seating surface, and the axially forward portion of the wedge further providing a forward support surface opposite to the longitudinal seating surface, and the axially rearward portion of the wedge providing a rearward support surface extending about essentially all of the periphery of the axially rearward portion; and

    the wedge being received within the bore so that the longitudinal seating surface of the wedge contacts the side surface of the cutting insert and for at least a portion of the length of the axially forward portion of the wedge substantially all of the forward support surface contacts the bore wall so as to frictionally retain the cutting insert in the seat, and for at least a portion of the length of the axially rearward portion of the wedge substantially all of the rearward support surface contacts the bore wall so as to frictionally retain the cutting insert in the seat.

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