Abstract: A cutting tool assembly includes a support block having a concealable outer surface portion, first and second bores, and first and second fluid passages. The first fluid passage is in fluid communication with the first bore and the second fluid passage. The second fluid passage has an axis and extends between the concealable outer surface portion and the second bore. Furthermore, the second bore and the second fluid passage are configured such that the axis may be extended through the second bore and beyond the support block without intersecting the support block. The cutting tool assembly also includes a replaceable spray nozzle having a body that extends into the first bore such that the spray nozzle is in fluid communication with the first fluid passage.

Abstract: A rotatable cutting bit-chuck assembly wherein the cutting bit has an axially forward end an axially rearward end with at least one cutting insert at the axially forward end. The cutting bit contains a cavity defined by a cavity wall. The chuck has an axially forward end and an axially rearward end. Upon assembling the cutting bit on the chuck, the cavity of the cutting bit receives the axially forward end of the chuck wherein there is a variable resistance retention member between the chuck and the cavity wall.

Abstract: A roof drill bit having a tool body with a cutting insert brazed thereto. The cutting insert has opposite leading and trailing face portions joined by a side surface which has a leading side relief portion adjacent the leading face portion and a trailing side relief portion adjacent the trailing face portion. The trailing side relief portion, which extends from the leading face portion a distance equal to between about one-third to two-thirds the thickness of the insert, has a greater relief angle that the leading side relief portion, which extends from the trailing face portion a distance equal to between about one-third to about two-thirds the thickness of the insert.

Abstract: A drill bit for drilling holes in a work surface including a hard wear-resistant insert and a metal body including a top working surface of an irregular surface configuration having a slot for retaining the hard wear-resistant insert. The body having a metal grain structure substantially parallel with the contour of the body. In a preferred embodiment the body is formed by cold-heading.

Abstract: A cutting bit useful for cutting various earth strata and the cutting insert, which may be made from a polycrystalline diamond composite, for such a cutting bit. The cutting bit has at least one pocket at the axially forward end thereof which receives its corresponding cutting insert. The cutting insert has at least one exposed cutting edge which is of an arcuate shape.

Abstract: A roof drill bit assembly comprising a roof drill bit and a chuck. The roof bit contains a cavity which opens at the rearward end thereof. Upon assembling the bit and the chuck, the cavity receives the axially forward end of the chuck. A sealing member is between the roof drill bit and the chuck so as to provide a fluid-tight connection between the chuck and the roof bit.

Abstract: A drill bit for drilling holes in a work surface including a hard wear-resistant insert and a metal body including a top working surface of an irregular surface configuration having a slot for retaining the hard wear-resistant insert. The body having a metal grain structure substantially parallel with the contour of the body. In a preferred embodiment the body is formed by cold-heading.

Abstract: An insert for use in a rotary drill bit wherein first and second top surfaces are opposite a bottom surface, first and second leading faces are opposite first and second trailing faces, and first and second end faces represent outside edges of first and second portions of the insert wherein in one embodiment each of the top surfaces meets its respective leading face to form a cutting edge which forms an oblique angle wherein the cutting edge on the first portion is linearly aligned with the cutting edge on the second portion.

Abstract: A rotary drill bit insert including an elongated body rotatable about a central axis and having two halves symmetrical about the axis, each symmetrical half having a top surface including a planar front surface contiguous a noncoplanar back relief surface, a bottom surface opposite the top surface, a leading face extending between forwardly facing edges of the front surface and the bottom surface, a trailing face opposite the leading face extending between rearwardly facing edges of the back relief surface and the bottom surface and a distal end surface extending between outwardly distal edges of the top surface, leading face, trailing face, and bottom surface.

Abstract: A rotatable cutting tool having a tool body with a socket contained in the forward end thereof wherein a hard insert is affixed to the tool body within the socket. The hard insert comprises an integral tip portion and an integral cylindrical flange portion joined to the tip portion by integral mediate portion. An integral boss projects from the bottom surface of the flange portion wherein the boss is of a generally frusto-conical shape which corresponds to the generally frusto-conical volume defined by the socket. A plurality of bumps projects from the bottom surface of the flange portion and the frusto-conical surface of the boss to provide for a braze joint of uniform thickness between the hard insert and the tool body.