Abstract: A non-core drill bit is provided with a metallic seat 2 attached to the tip of a shank of a boring tool, a cylindrical first diamond grindstone body 3 fixed to the metallic seat 2 and having a recessed cutout portion 10 to be opened to one side, and a second diamond grindstone body 4 installed inside the recessed cutout portion 10. The tip of the second diamond grindstone body 4 is positioned on the metallic seat 2 side from the tip of the first diamond grindstone body 3. The inner side of the tip face of the first diamond grindstone body 3 is preferably formed in an approximately reverse-conical recessed shape.

Abstract: A non-core drill bit is provided with a metallic seat 2 attached to the tip of a shank of a boring tool, a cylindrical first diamond grindstone body 3 fixed to the metallic seat 2 and having a recessed cutout portion 10 to be opened to one side, and a second diamond grindstone body 4 installed inside the recessed cutout portion 10. The tip of the second diamond grindstone body 4 is positioned on the metallic seat 2 side from the tip of the first diamond grindstone body 3. The inner side of the tip face of the first diamond grindstone body 3 is preferably formed in an approximately reverse-conical recessed shape.

Abstract: A drill tool is provided with: a drive source accommodated in a tool body 2; a bit drive shaft 3 which is rotation-driven by the drive source and provided projectingly from a front end of the drill body 2; and a diamond bit 4 attached to a front end of the bit drive shaft 3. Further, the drill tool is provided with a vibrating apparatus which generates vibrating force which acts in the axial direction of the bit drive shaft 3, a magnitude of which pulsates, and vibrating moment which acts in the rotational direction of the bit drive shaft 3, a magnitude of which pulsates.

Abstract: In a core bit formed with a drill portion in a cylindrical shape formed with a boring blade on one end side thereof and a mounting portion in a cylindrical shape mounted to a chuck portion of a concrete drill on other end side of the drill portion, formed with an engaging portion capable of being engaged with an engaging portion on a side of the chuck portion at an outer peripheral face of the mounting portion for transmitting rotation of a side of the concrete drill via the engaging member, the outer peripheral face of the mounting portion on a side of the boring blade of the engaging member is formed with a flange portion in a shape of a flange having a diameter larger than an outer diameter of the engaging member.

Abstract: A drill tool is provided with: a drive source accommodated in a tool body 2; a bit drive shaft 3 which is rotation-driven by the drive source and provided projectingly from a front end of the drill body 2; and a diamond bit 4 attached to a front end of the bit drive shaft 3. Further, the drill tool is provided with a vibrating apparatus which generates vibrating force which acts in the axial direction of the bit drive shaft 3, a magnitude of which pulsates, and vibrating moment which acts in the rotational direction of the bit drive shaft 3, a magnitude of which pulsates.

Abstract: A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1).

Abstract: In a core bit formed with a boring blade at a front end thereof and integrally formed with a mounting portion, at a rear end portion thereof, formed with a guide portion in a cylindrical shape mounted to a chuck portion formed at a concrete drill, a ring-like seal member forming a seal between the mounting portion and a side of the chuck portion is formed at the guide portion in the cylindrical shape of the core bit.

Abstract: A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1).

Abstract: A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1)

Abstract: In a core bit formed with a drill portion in a cylindrical shape formed with a boring blade on one end side thereof and a mounting portion in a cylindrical shape mounted to a chuck portion of a concrete drill on other end side of the drill portion, formed with an engaging portion capable of being engaged with an engaging portion on a side of the chuck portion at an outer peripheral face of the mounting portion for transmitting rotation of a side of the concrete drill via the engaging member, the outer peripheral face of the mounting portion on a side of the boring blade of the engaging member is formed with a flange portion in a shape of a flange having a diameter larger than an outer diameter of the engaging member.

Abstract: In a core bit formed with a boring blade at a front end thereof and integrally formed with a mounting portion, at a rear end portion thereof, formed with a guide portion in a cylindrical shape mounted to a chuck portion formed at a concrete drill, a ring-like seal member forming a seal between the mounting portion and a side of the chuck portion is formed at the guide portion in the cylindrical shape of the core bit.

Abstract: A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) contained in the main body (1) in which the main body (1) is provided with a vibrating apparatus (8) for exerting a vibrating force a magnitude which is pulsated to change along the bit drive shaft (4) to the main body (1).