Patent ID: 11891895
Assignee: THE SOLLAMI COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 14:
15. A combination bit holder and base block comprising:
a base block comprising:
a base mounting portion including a base surface; and
a device receiving portion integrally extending from the base mounting portion opposite the base surface, the device receiving portion comprising a base block bore extending from a front face of the device receiving portion to a rear face of the device receiving portion; and

a bit holder comprising:
a body portion; and
a generally cylindrical hollow shank axially depending from a bottom of the body portion, the shank comprising:
a forward portion of the shank adjacent the bottom of the body portion, the forward portion comprising an outer diameter sized for a non-rotatable interference fit with said base block bore including one of a declining taper outer surface towards a distal end of the shank and a generally cylindrical outer surface, the forward portion including a first annular groove positioned circumferentially around the forward portion approximately midway between a forward end of the forward portion and a distal end of the forward portion;
a distal portion of the shank comprising an outer diameter including an outer surface that is sized for an interference fit with said base block bore, the distal portion including a second annular groove therearound;
an elongate slot through a side wall of said hollow shank axially extending from the distal end of the shank to the forward portion adjacent the first annular groove, the elongate slot comprising an upper termination adjacent said forward portion;
a first c-shaped annular ring disposed in the first annular groove;
a second c-shaped annular ring disposed in the second annular groove;
an outer diameter of said first annular ring being larger than the outer diameter of said forward portion of the shank, providing added interference between said forward portion and said base block bore;
an outer diameter of said second annular ring being larger than the outer diameter of said distal portion, providing added interference between said distal portion and said base block bore; and

a bit holder bore axially extending from a forward end of the body portion to the distal end of the shank.