An arbor for a hole saw an arbor stem, an actuator, and at least one post. The arbor stem includes at least one arm having a threaded portion configured to engage the hole saw. The actuator is rotatable about a central axis of the arbor to move the at least one arm. The actuator includes a surface facing the at least one arm and a track. The track is recessed from the surface of the actuator. The at least one post extends from the at least one arm to engage the track. The arm is movable in a radial direction in response to rotation of the actuator to vary a circumference of the arbor stem.

An arbor for a hole saw an arbor stem, an actuator, and at least one post. The arbor stem includes at least one arm having a threaded portion configured to engage the hole saw. The actuator is rotatable about a central axis of the arbor to move the at least one arm. The actuator includes a surface facing the at least one arm and a track. The track is recessed from the surface of the actuator. The at least one post extends from the at least one arm to engage the track. The arm is movable in a radial direction in response to rotation of the actuator to vary a circumference of the arbor stem.

The present disclosure provides a clamping jaw assembly and a drill chuck, which solve technical problems of complex structure, small clamping range, poor clamping effect, and high cost of the existing clamping jaw assembly. The clamping jaw assembly includes a first clamping jaw and a second clamping jaw, both of which include a screwing section, an outer surface of each screwing section is arranged with a thread, a top end of each screwing section is arranged with a clamping section, the screwing section is fixedly connected with corresponding clamping section. An inner side of the clamping section of the first clamping jaw includes a first clamping part, and an inner side of the clamping section of the second clamping jaw includes a second clamping part matched with the first clamping part. The present disclosure can be widely used in fields of electric tools, machine tool accessories and medical equipment, etc.

The present disclosure provides a clamping jaw assembly and a drill chuck, which solve technical problems of complex structure, small clamping range, poor clamping effect, and high cost of the existing clamping jaw assembly. The clamping jaw assembly includes a first clamping jaw and a second clamping jaw, both of which include a screwing section, an outer surface of each screwing section is arranged with a thread, a top end of each screwing section is arranged with a clamping section, the screwing section is fixedly connected with corresponding clamping section. An inner side of the clamping section of the first clamping jaw includes a first clamping part, and an inner side of the clamping section of the second clamping jaw includes a second clamping part matched with the first clamping part. The present disclosure can be widely used in fields of electric tools, machine tool accessories and medical equipment, etc.

Tool adapter assemblies are presented including: a quick release coupler including: a spindle defining a partial cylindrical cavity, the spindle including a base portion, a body portion, and an end portion where the body portion includes a number of ball stop recesses; a number of ball stops slidingly engaged with the number of ball stop recesses; and a sleeve slidingly coupled with the spindle, where the sleeve is configured to lock and release the ball stops; and an accessory connector including at least one of: one or more annular grooves configured to engage with number of ball stops, a number of detents configured to engage with number of ball stops, or both the annular groove and the number of detents; and an accessory engagement portion positioned along a proximal end of the accessory connector.

A cutter holder assembly capable of preventing a cutter thereof from falling includes a cutter holder, a cutter, a positioning key, a compressing element, and a nut. The cutter holder has a chamber and a mounting hole both formed in the cutter holder. The chamber has at least one engaging groove formed therein and having a guiding channel and a limiting groove communicating with each other. The cutter has a keyway formed thereon. The positioning key is mounted in the keyway and can extend into the guiding channel and the limiting groove, such that the positioning key can be limited in the cutter holder along with the cutter. The compressing element is mounted to the mounting hole and can move relative to the mounting hole to compress the positioning key in the limiting groove of the at least one engaging groove. The nut is sleeved on the cutter holder.

A cutter holder assembly capable of preventing a cutter thereof from falling includes a cutter holder, a cutter, a positioning key, a compressing element, and a nut. The cutter holder has a chamber and a mounting hole both formed in the cutter holder. The chamber has at least one engaging groove formed therein and having a guiding channel and a limiting groove communicating with each other. The cutter has a keyway formed thereon. The positioning key is mounted in the keyway and can extend into the guiding channel and the limiting groove, such that the positioning key can be limited in the cutter holder along with the cutter. The compressing element is mounted to the mounting hole and can move relative to the mounting hole to compress the positioning key in the limiting groove of the at least one engaging groove. The nut is sleeved on the cutter holder.

A tool holder includes a main body defining a mounting end and a receiving end, the mounting end positioned opposite from the receiving end, the main body defining a main body bore extending into the receiving end toward the mounting end; an extension defining a tool head attached to a rod, the tool head defining a tool head end opposite from the rod, a tool holder length defined between the mounting end and the tool head end, the tool head configured to receive at least one cutting tool, the rod received within the main body bore; and a locking mechanism engaging the extension and the main body in a locked position, the locking mechanism being disengaged from either the main body or the extension in an unlocked position, the locking mechanism being selectively positionable about and between the locked position and the unlocked position.

A reducing sleeve for fastening a machining tool in a tool holder is described. Said reducing sleeve comprises a reducing sleeve body, which comprises a first tool-side end and a second tool holder-side end. In addition, at least one coolant supply channel is provided in the reducing sleeve body. Furthermore, a multifunctional interface is arranged at the second end and is designed for coupling to a sealing unit and a safety unit. Additionally presented is a modular system for providing a reducing sleeve assembly, which comprises such a reducing sleeve, a sealing unit, and a safety unit. In addition, a machining assembly with a tool holder, a reducing sleeve, and a machining tool is presented.

A reducing sleeve for fastening a machining tool in a tool holder is described. Said reducing sleeve comprises a reducing sleeve body, which comprises a first tool-side end and a second tool holder-side end. In addition, at least one coolant supply channel is provided in the reducing sleeve body. Furthermore, a multifunctional interface is arranged at the second end and is designed for coupling to a sealing unit and a safety unit. Additionally presented is a modular system for providing a reducing sleeve assembly, which comprises such a reducing sleeve, a sealing unit, and a safety unit. In addition, a machining assembly with a tool holder, a reducing sleeve, and a machining tool is presented.