A drill bit and a manufacturing method thereof that ensures integral mounting of a drill and a drill holder with a simplified construction and in a simplified manner are disclosed. The drill bit has a drill with a bit and a shank, and a drill holder formed with an axial insertion hole for fitting the shank. An engaging part is formed at a base end of the drill. A blind hole that intersects the insertion hole is formed in the drill holder to form a restricting part, or a stopper equivalent to the restricting part is fitted in the bottom of the blind hole. Engagement of a top of the stopper or the restricting part with the engaging part prevents a relative rotation of the drill to the drill holder.
A cutter bit is provided which includes a body having a pair of free ends with a cutter bit mounted adjacent each free end. A boss extends outwardly from the center of the body such that a portion of the body and the cutter bit may be mounted in a rotary cutting tool to allow the second cutter bit to be utilized. The bit is reversible such that either cutter bit may be positioned within the chuck of a rotary cutter tool while the cutter bit mounted on the opposite side of the body is utilized. A method of mounting a cutter bit in a rotary cutter tool is also provided which includes steps of loosening the bit within the chuck of the rotating cutting tool, removing the bit from the chuck, rotating the bit end to end, replacing the end of the bit that was out of the chuck originally into the chuck, and tightening the chuck.
A tool employs a connect-disconnect coupling for a power drill to hold a multi-functional bit having at its one end a drill element adapted to form a hole and a countersink and at its other end a driver element to drive a screw or other type of fastener.
A drill and drive apparatus includes a tube assembly which defines a tool chamber. The apparatus further includes a tool holder which is configured to be at least partially received in the tool chamber of the tube assembly. The tool holder includes a holder body defining a first tool recess and having (i) a first section with a first width and at least one ball aperture communicating with the first tool recess, and (ii) a second section with a second width less than the first width. The tool holder further includes a first tool locking mechanism at a first end portion thereof. The first tool locking mechanism includes (i) a tool locking collar positioned around the holder body and positionable between a tool lock position and a tool release position, (ii) at least one ball positioned with the at least one ball aperture, wherein the at least one ball extends into the first tool recess when the tool locking collar is positioned in the tool lock position, and the at least one ball can be located away from the first tool recess when the tool locking collar is positioned in the tool release position, and (iii) a tool spring, positioned around the second section of the holder body, which biases the tool locking collar toward the tool lock position.
An apparatus includes a rotatable device, which may be a keyless chuck, a keyless chuck adapter, a collet chuck, a collet adapter, a set screw bit retaining chuck, or a set screw bit retaining adapter. The rotatable device is configured to be mounted to a power tool for rotational driving of the rotatable device. The rotatable device is configured to receive a first bit device detachably mounted in the rotatable device for powering rotational movement of the first bit device. A generally cylindrical mounting section is defined on the rotatable device, which is capable of being rotatably driven by the power tool. The generally cylindrical mounting section includes at least one locking mechanism on it. The generally cylindrical mounting section is adapted for insertion in and engagement with a bit holding attachment.
An attachment (10) for use with a power tool (12) which can conveniently convert a rotatable chuck (14) or adapter (78) used with a first bit device (22) to usage with a second bit device (36) and vice versa. Either first or second bit device can be used for drilling, fastener driving or for other operations, however the preferred configuration is use with a first bit device for drilling pilot holes and a second bit device for driving of a fastener into the freshly drilled pilot hole. The attachment (10) is easily detachably securable with respect to any chuck (14) or adapter (78) which has a rotating cylindrical surface (18) with a locking aperture (20) therein. A capping ring (52) may be positioned in an annular slot (42) to retain a resilient member (48) positionable within an annular groove (40) for facilitating biasing of a locking pin (44) into a locking aperture (20) on the rotatably driven cylindrical mounting surface (18).
