Max Co., Ltd.

Naohide Murakami

Kigen Agehara

Michio Yamashita

Takuma Nonaka

Motoshige Akatsu

Kazuhisa Morita

A non-core drill bit is provided with a metallic seatattached to the tip of a shank of a boring tool, a cylindrical first diamond grindstone bodyfixed to the metallic seatand having a recessed cutout portionto be opened to one side, and a second diamond grindstone bodyinstalled inside the recessed cutout portion. The tip of the second diamond grindstone bodyis positioned on the metallic seatside from the tip of the first diamond grindstone body. The inner side of the tip face of the first diamond grindstone bodyis preferably formed in an approximately reverse-conical recessed shape.

Non-core drill bit

A drill tool is provided with: a drive source accommodated in a tool bodya bit drive shaftwhich is rotation-driven by the drive source and provided projectingly from a front end of the drill bodyand a diamond bitattached to a front end of the bit drive shaftFurther, the drill tool is provided with a vibrating apparatus which generates vibrating force which acts in the axial direction of the bit drive shafta magnitude of which pulsates, and vibrating moment which acts in the rotational direction of the bit drive shafta magnitude of which pulsates.

Drill tool

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.

Core bit

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

Concrete drill

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.

Growing community of inventors

Tokyo, Japan

Naohide Murakami