Patent application number | Description | Published |
20080298915 | Core Drill - To provide a user-friendly core drill which, when forming a large-diameter cut hole by the core drill with respect to an object to be drilled, such as concrete, is able to easily form, for example, a chamfered portion or a countersunk portion with respect to an opening end portion of the cut hole. | 12-04-2008 |
20090103994 | Drill Bit - An object of the present invention is to provide a drill bit whose drilling performance does not deteriorate and whose radially outer end of a blade tip is never chipped. A drill bit A comprises: a plurality of cutting blades | 04-23-2009 |
20090129878 | WATER FEED APPARATUS FOR CORE DRILL - A water feed apparatus ( | 05-21-2009 |
20090139772 | DIAMETRICALLY EXPANDED GROOVE CUTTING APPARATUS AND EXPANDABLE MECHANISM - To provide a diametrically expanded groove cutting apparatus capable of simultaneously cutting a plurality of diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein, and to provide an expandable mechanism used in the diametrically expanded groove cutting apparatus. | 06-04-2009 |
20090172911 | Drill Dust Collector - Object: A drill dust collector is provided that is capable of drilling holes in an area ranging from a position near a corner to a position distant from the corner and that can be positioned with a side face in contact with an upright face such as a wall during drilling. | 07-09-2009 |
20090217482 | Anchor Bolt Hole Cleaning Device - An anchor bolt hole cleaning device is provided with a brush on a peripheral portion thereof and is capable of cleaning cutting powder adhered to a hole inner peripheral surface. The anchor bolt hole cleaning device includes a suction nozzle which can be inserted into an anchor bolt hole and suctions the cutting powder. The suction nozzle includes a main body that is a tubular body, a suction opening formed at a tip end portion of the main body, and an exhaust opening. The exhaust opening is formed at a base end portion of the main body to be connected to a tip end of a suction hose whose base end is connected to a suction opening of a suction device. The brush is disposed on an outer peripheral surface of the main body. | 09-03-2009 |
20100003093 | Hard Tip and Method for Producing the Same - The object of the invention is to provide a hard tip where the nose side has wear resistance and the bonding side has toughness. The chemical composition of sintered hard alloy constituting the hard tip is such that a compounding ratio of WC to Co is substantially the same from the nose side to the bonding side, and a first bonding metal or a second bonding metal has a gradient chemical composition wherein the content of the first bonding metal or the second bonding metal is increased from the nose side to the bonding side, the first bonding metal does not form the eutectic texture with WC, and the second bonding metal has the eutectic temperature with WC over the eutectic temperature of WC—Co sintered hard alloy and the melting point over the liquid phase sintering temperature of WC—Co sintered hard alloy. | 01-07-2010 |
20100007101 | Shank Attachment Structure - A shank attachment structure which may supply coolant even if a drill without a center pin is attached. A shank can be attached to a shank attachment hole with a single motion. The outer diameter of the shank can be inserted into the shank attachment hole. A chamfered portion is formed around an edge of a base end, and an elongated concave portion is formed on a tip end. A coolant hole is formed on a base end of the shank attachment hole, and a valve body is disposed in the hole. A sealing member is disposed adjacent to the tip end side. A first sleeve is disposed such that a base of the shank moves the first sleeve, so that a base of the sleeve separates from the sealing member; and when the shank is not in contact with the tip, an outer peripheral surface of the first sleeve moves the engaging member radially outwardly. | 01-14-2010 |
20100127465 | Shank Attachment Device - A shank attachment device attaches a core drill to a rotating portion of a drill device and includes an arbor and a shank. The arbor is detachably attachable to the rotating portion. The arbor and the shank are detachably attachable to each other. The shank is detachably attachable to the core drill. A stopper engages a groove of the shank to stop a movement of the shank in an axial direction away from the arbor. A rotational torque of the arbor can be transmitted to the shank by engaging a first engaging portion of the arbor with a first engaged portion of the shank. The shank contacts the arbor to stop the movement of the shank in the axial direction toward the arbor. | 05-27-2010 |
20100226728 | Core Cutter - A core cutter includes a body portion 1 and a plurality of cutting blades 2 arranged at intervals in a circumferential direction. At least one of the cutting blades serves as an inner cutting blade, and the remaining cutting blades 2 serve as outer cutting blades. The thickness of the body portion maintains distortion resistance of the body portion. Through grooves penetrating a tip end of the body portion are formed toward a tip end side. The cutting blades are attached to the through grooves 3, and have the same size as the through groove 3. Gallets discharge the chips, with each of the gallets formed by an outer peripheral surface. The cutting blades are welded to the grooves such that a tip end portion coincides with a peripheral surface of an axial-direction tip end of the gallet. | 09-09-2010 |
20140072468 | Method for Producing Hard Tip - The object of the invention is to provide a hard tip where the nose side has wear resistance and the bonding side has toughness. The chemical composition of sintered hard alloy constituting the hard tip is such that a compounding ratio of WC to Co is substantially the same from the nose side to the bonding side, and a first bonding metal or a second bonding metal has a gradient chemical composition wherein the content of the first bonding metal or the second bonding metal is increased from the nose side to the bonding side, the first bonding metal does not form the eutectic texture with WC, and the second bonding metal has the eutectic temperature with WC over the eutectic temperature of WC—Co sintered hard alloy and the melting point over the liquid phase sintering temperature of WC—Co sintered hard alloy. | 03-13-2014 |
20140154020 | COOLANT SUPPLY DEVICE AND ELECTRIC DRILL UNIT PROVIDED WITH COOLANT SUPPLY DEVICE - A coolant supply device attached to an electric drilling tool is configured to supply a coolant to a drilling portion at a distal end of a drill. The coolant supply device includes: a first flange member and a second flange member provided axially on a rotating shaft, the rotating shaft sharing a same axis with the drill, the first flange member being positioned at the drill side, the second flange member being positioned such that the second flange member is more distant from the drill than the first flange member; space formed between the flange members, into which a coolant is injected; a coolant supply passage formed between the first flange member and the drill and guiding the coolant in the space to the drill; and a coolant push-out mechanism configured to push the coolant out of the space toward the coolant supply passage. | 06-05-2014 |