Improved bit holder/bit holder block structure provides increased access to the rear of the assembly allowing bit holder blocks to be mounted closer to each other for micro-milling operations. Shortened bit holder shanks are reconfigured from prior art to provide increased holding power between the bit holder shank and bit holder block bore.

Improved bit holder/bit holder block structure provides increased access to the rear of the assembly allowing bit holder blocks to be mounted closer to each other for micro-milling operations. Shortened bit holder shanks are reconfigured from prior art to provide increased holding power between the bit holder shank and bit holder block bore.

The invention relates to a pick, in particular a round-shank pick, comprising a pick head and a pick shank, wherein the pick head consists of at least a base part and a cutting element, which is connected to the base part and is composed of a hard material, in particular hard metal, wherein the base part has a wear-resistant layer on the outer surface thereof at the connection to the cutting element, which wear-resistant layer covers at least one segment of the outer surface of the base part facing the cutting element and wherein an end face of the wear-resistant layer facing the cutting element is covered by the cutting element. According to the invention, the base part has an axially oriented cut-out for receiving a fastening segment of the cutting element, the base part has a counter surface facing the cutting element and extending around the cut-out, and the counter surface and the end face of the wear-resistant layer form a continuous flat surface. The invention further relates to two methods for producing such a pick. The pick formed in such a way has low abrasive wear.

A cutting bit assembly includes a block, a bit sleeve, and a seal. The block includes a first bore and a fluid passage. The fluid passage includes a first portion and a second portion in fluid communication with the first portion. The first portion is oriented obliquely with respect to the first bore, and the second portion extends at least partially around the perimeter of the first bore. The bit sleeve includes a shank, a flange, and a second bore extending through the shank and the flange. The shank is positioned within the first bore of the block such that a surface of the flange engages a first end surface of the block. The seal is positioned between the second portion of the fluid passage and the shank to prevent contact between a fluid in the fluid passage and the outer surface of the shank.

A cutting bit assembly includes a block, a bit sleeve, and a seal. The block includes a first bore and a fluid passage. The fluid passage includes a first portion and a second portion in fluid communication with the first portion. The first portion is oriented obliquely with respect to the first bore, and the second portion extends at least partially around the perimeter of the first bore. The bit sleeve includes a shank, a flange, and a second bore extending through the shank and the flange. The shank is positioned within the first bore of the block such that a surface of the flange engages a first end surface of the block. The seal is positioned between the second portion of the fluid passage and the shank to prevent contact between a fluid in the fluid passage and the outer surface of the shank.

A washerless cutting tool assembly includes a cutting tool holder and a rotatable cutting tool at least partially disposed within the cutting tool holder. The cutting tool holder includes an alignment feature in the form of a protrusion at an axial forward end and a groove at an axial rearward end of the head portion of the rotatable cutting tool. The groove is capable of receiving the protrusion of the cutting tool holder to align the central, longitudinal axis of rotatable cutting tool with the central, longitudinal axis of the cutting tool holder. The cutting tool assembly further includes a limited rotated feature in the form of a braking ring disposed within an annular groove and a retainer ring disposed over the braking ring.

A washerless cutting tool assembly includes a cutting tool holder and a rotatable cutting tool at least partially disposed within the cutting tool holder. The cutting tool holder includes an alignment feature in the form of a protrusion at an axial forward end and a groove at an axial rearward end of the head portion of the rotatable cutting tool. The groove is capable of receiving the protrusion of the cutting tool holder to align the central, longitudinal axis of rotatable cutting tool with the central, longitudinal axis of the cutting tool holder. The cutting tool assembly further includes a limited rotated feature in the form of a braking ring disposed within an annular groove and a retainer ring disposed over the braking ring.

A wear-resistant armored cutting tool may be provided. The wear-resistant armored cutting tool may include a tool body, a bolster, at least one wear-resistant member, and a cutting tip. The bolster may be fixedly attached to the tool body with an end of a surface of the tool body disposed adjacent the bolster. The at least one wear-resistant member may be fixedly attached to the tool body. The at least one wear-resistant member may be disposed adjacent to the end of the surface of the tool body. The cutting tip may be fixedly attached to the bolster. The bolster, the at least one wear-resistant member, and the cutting tip may each have a material hardness which is greater than that of the tool body.

Disclosed is a chisel in the application. The chisel includes a chisel end, a chisel holding portion, a holding seat, a limit disc, a hole having an annular surface formed around a central axis L of the limit disc, the limit disc being provided with at least one circle of groove in one side thereof, the groove being penetrated by the hole, the limit disc having a support surface and a first end surface, the groove being transitioned from the support surface to the first end surface, the holding seat being provided with a support portion, and the groove being engaged with the support portion. The chisel in the application may maintain the optimal rotary cutting performance and transmit the working pressure more effectively during operation, which may prolong the service life of the chisel.

Disclosed is a chisel in the application. The chisel includes a chisel end, a chisel holding portion, a holding seat, a limit disc, a hole having an annular surface formed around a central axis L of the limit disc, the limit disc being provided with at least one circle of groove in one side thereof, the groove being penetrated by the hole, the limit disc having a support surface and a first end surface, the groove being transitioned from the support surface to the first end surface, the holding seat being provided with a support portion, and the groove being engaged with the support portion. The chisel in the application may maintain the optimal rotary cutting performance and transmit the working pressure more effectively during operation, which may prolong the service life of the chisel.