Patent ID: 11913287
Assignee: VERMEER MANUFACTURING COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A combination of a pullback adaptor and a drill bit, the combination comprising:
a pullback adaptor having
a first end configured to connect to a swivel;
a second end configured to connect to a drill bit;
a body extending between the first end and the second end; and
a protrusion extending from the body adjacent the second end, the protrusion having therein a threaded aperture defining an adaptor mounting axis, the protrusion defining an annular planar mount surface generally perpendicular to the adapter mounting axis;

a drill bit having
a body with a steering surface;
an aperture extending through the body at the steering surface; and
an adaptor mount surface adjacent the aperture;

wherein the pullback adaptor is mounted to the drill bit with a fastener that extends through the aperture in the drill bit and into the threaded aperture of the pullback adaptor such that the annular planar mount surface of the protrusion engages the mount surface of the drill bit.