210results about "Stepped drills" patented technology

A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by traction or biting surfaces formed from two-sided frusto-conically-shaped regions. The surfaces are bounded on one side by a nonlinear cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis, where the biting surfaces comprise a plurality of serrations, and where the cutting edges are separated by flutes which spiral along a longitudinally extending periphery of the bit.

A coupler for a quick change rotary cutting tool assembly allowing a cutter to be quickly and releasably coupled to a shank wherein the coupler has a cylindrical portion with a threaded portion to engage the shank and a portion with a transverse groove with undercut walls to form recesses. The cutter has an anchor made as a disk with parallel flats which engage the recesses of the cylindrical portion to releasably secure the cutter to the shank.

A bit for removing a broken security fastener having an elongated shaft with a longitudinal axis. The shaft has a first end and a second end. The first end terminates in a tip region having a recess for receipt of the post of the security fastener, the recess being disposed substantially along the longitudinal axis. The second end of the shaft is configured to be received by the chuck of a tool which provides rotational torque.

A method of installing panels includes temporarily securing un-upholstered panels in place on an underlying support and marking the underlying support at each of a plurality of panel clip locations on the panel. The panel is removed from the support structure for upholstering. The support structure is drilled at the marks to provide a hole to receive a socket component, and a socket component is driven into each of the receiving holes in the support structure. The socket component includes a cup open to at least one end, an external thread for engaging the support structure, and a constriction in the cup spaced away from the bottom of the cup. A plug component is secured at each of the panel clip locations on the panel, the plug component having a protruding portion to engage in the socket. The upholstered panel is lifted into position and the periphery is pressed into place to engage the protruding portions of the plug components within the cups of the sockets.

A solid step drill, including a front tip and a rear end between which a center axis extends and around which the drill is rotatable in a predetermined direction. At least two cylindrical sections are concentric with the center axis, a first section extending rearward from the front tip and having a first diameter, and a second section extending behind the first section and having a second diameter that is greater than the first diameter, the first section transforming into the second section via a step. The tip includes two primary cutting edges, which individually co-operate with a respective chip flute that is delimited by a concave surface and countersunk in the first section and in the second section, the respective chip flute intersecting the step while forming a secondary cutting edge. Adjacent to the secondary cutting edge, a chip breaking recess is formed between a cutting edge line of the cutting edge and the concave surface.

Provided is a drill bit which can perform punching long-term and stably in a process of performing punching on a to-be-cut material which is stacked by a metal component and a fiber reinforced resin composite layer.The drill bit includes at least two stepped cutting edges a which are axially split. A cutting edge of a first step from a tip is formed so as to satisfy at least one of the following conditions. That is, a number of blades is smaller, a point angle of the cutting edge is larger, or a clearance angle of the cutting edge is larger than that of cutting edges of a second and subsequent step(s). As a result, a thrust resistance during a perforation can be reduced compared with a case in which the first step cutting edge is formed such that the number of blades, the point angle of the cutting edge and the clearance angle of the cutting edge are the same as those of the second and subsequent step(s). For example, under a condition of using two blades of the first step cutting edge, four blades of the second step cutting edge, four blades of a third step cutting edge, and the point angles [theta]1)[theta]2)[theta]3, and the clearance angles [gamma]1>=[gamma]2>=[gamma]3, each point angle of the first step cutting edge and the second step cutting edge is constant, and the point angle of the third step cutting edge gradually reduces as moving towards a rear end of the drill bit, so that ridge of the cutting edges forms a smooth curve shape.