Excavating bit

Claim 2

A nonrotatable excavating bit, designed for mounting in a support block having a bore in one face and a smooth exterior face which is angularly related to, but not perpendicular to, the bore axis, said bit comprising a substantially flat working portion on one end and a cylindrical shank portion on the other; said shank portion adapted to be received in said bore so as to retain said bit in the support block; an abutment shoulder formed by the juncture of said shank portion with said working portion; a tang extending from said abutment shoulder; said tang having a tang face which faces said shank portion; said tang face is angularly related to, but not perpendicular to, the shank portion axis; said tang face in and of itself sufficiently defining a means for mating with said smooth exterior face of said support block and holding said bit nonrotatable in the support block.

Claim 3

An excavating bit according to claim 1 in which said cylindrical shank has an undercut formed thereon for receiving a resilient clip therein.

Claim 4

An excavating bit according to claim 2 which further includes a resilient clip mounted in said undercut and in a free state extending beyond the confines of said undercut and the bore in the support block.

Claim 5

In combination: a support block and a bit wherein said support block has a bottom portion for attachment to an earthworking machine; a forwardly projecting face on said support block through which a bore is formed to receive said bit; said bit having a flat forwardly extending working surface and a cylindrical rearwardly extending shank adapted to be received in said bore; angularly related exterior faces surround said forwardly projecting face on said support block; cooperating means on said block and said bit for holding said bit in said block; a tang extending from said bit; said tang having a tang face which faces said shank; said tang face is angularly related to, but not perpendicular to, the bore axis; said tang face contacting one of said angularly related exterior faces of said block; and said contacting, in and of itself, sufficient to define a means for holding said bit nonrotatably in said block.

Claim 6

In combination: a support block and a bit wherein said support block has a bottom portion for attachment to an earthworking machine; a forwardly projecting face on said support block through which a bore is formed to receive said bit; said bit having a flat forwardly extending working surface and a cylindrical rearwardly extending shank adapted to be received in said bore; angularly related exterior faces surround said forwardly projecting face on said support block; cooperating means on said block and said bit for holding said bit in said block; a tang extending from said bit; said tang having a tang face which faces said shank; said tang face is angularly related to, but not perpendicular to, the bore axis; said tang face contacting one of said angularly related exterior faces of said block; and said contacting, in and of itself, sufficient to define a means for holding said bit nonrotatably in said block.

Claim 7

The combination according to claim 4 which further includes cooperating elements of abutment between said block and said bit for transmitting the working load from the bit to the block.

Claim 8

The combination according to claim 5 which includes an annular abutment face on said bit formed at the juncture of said working face of said bit and said cylindrical shank of said bit.

Claim 9

The combination according to claim 6 which further includes said tang extending from said abutment face of said bit.

Claim 10

A nonrotatable excavating bit according to claim 1 wherein said tang face facing said shank portion and which mates with a smooth exterior face of the support block is comprised of a single smooth plane.

Claim 11

A combination according to claim 7 wherein said angularly related face of said support block which contacts said tang of said bit is also angularly related to the axis of said bore.