# US 8,739,658 B2 · Damaged bolt and screw removing devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,739,658 B2 - Document ID: US8739658B2 - Status: Granted - Kind: B2 - Application number: 13/478,844 - Filed: 2012-05-23 - Published: 2012-11-15 - Granted: 2014-06-03 - Earliest claimed: 2003-04-25 - Assignees: Combined Products Co. #1 Inc. - Applicants: Burton Kozak; Ira Kozak - Inventors: Burton Kozak; Ira Kozak - Web page: https://patentgrep.com/patent/US8739658B2 ## CPC - B23B 51/00: Tools for drilling machines - B23B 51/00035: {Spade drills} - B23B 51/0081: {Conical drills} - B23B 51/009: {Stepped drills} - B23B 51/02: Twist drills - B23B 51/10: Bits for countersinking - B25B 27/18: withdrawing broken threaded parts or twist drills - B23B 2251/04: Angles, e.g. cutting angles - B23B 2251/082: Curved cutting edges - B23B 2251/087: Cutting edges with a wave form - B23B 2251/14: Configuration of the cutting part, i.e. the main cutting edges - B23B 2251/48: Chip breakers - Y10T 408/909: Having peripherally spaced cutting edges - Y10T 408/9095: with axially extending relief channel - Y10T 408/9097: Spiral channel - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract 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. ## Claims ### Claim 1 A bit, said bit comprising: a) an elongated shaft with a longitudinal axis, said shaft having a first end, and a second end, said first end terminating in a tip region; b) a plurality of non-cutting edges and of cutting edges extending from said tip region, said cutting edges configured to cut, and said cutting edges and said non-cutting edges alternating with each-other; c) a plurality of frusto-conical traction surfaces each extending from one said cutting edge to a non-cutting edge, wherein one or more of said surfaces comprise a plurality of axially asymmetric serrations, where said serrations are rectilinear; and d) said second end of the shaft configured to be received by a tool which provides rotational torque. ### Claim 2 (depends on 1) The bit as recited in claim 1 further comprising two or more flutes extending longitudinally along the shaft and positioned intermediate said cutting edges. ### Claim 3 (depends on 2) The bit as recited in claim 2 wherein at least one of the flutes defines a helical surface which extends along a longitudinally extending surface of a periphery of the bit so as to constitute a drill bit. ### Claim 4 (depends on 3) The bit as recited in claim 3 wherein the flutes are defined by the cutting edges and a portion of each of the serrations are positioned on the cutting edge. ### Claim 5 (depends on 1) The bit as recited in claim 1 wherein said serrations define a plurality of teeth on the cutting edges. ### Claim 6 (depends on 5) The bit as recited in claim 5 wherein one or more of said teeth defines spiral segments on said traction surfaces. ### Claim 7 (depends on 1) The bit as recited in claim 1 wherein for at least one said frusto-conical surface the non-cutting edge forms a more acute angle with respect to the axis of the bit than the cutting edge. ### Claim 8 (depends on 1) The bit as recited in claim 1 wherein one or more of said cutting edges comprises one or more concave sections. ### Claim 9 (depends on 1) The bit as recited in claim 1 wherein said serrations are so oriented that a radial distance between said longitudinal axis and a point on a serration increases as a shortest distance between said point and a cutting edge increases. ### Claim 10 A bit, said bit comprising: a) an elongated shaft with a longitudinal axis, said shaft having a first end, and a second end, said first end terminating in a tip region; b) a plurality of non-cutting edges and of cutting edges extending from said tip region, said cutting edges configured to cut, and said cutting edges and said non-cutting edges alternating with each-other, wherein one or more of said cutting edges comprises one or more concave sections; c) a plurality of frusto-conical traction surfaces each extending from one said cutting edge to a non-cutting edge, wherein one or more of said surfaces comprise a plurality of axially asymmetric serrations; and d) said second end of the shaft configured to be received by a tool which provides rotational torque. ### Claim 11 (depends on 10) The bit as recited in claim 10 wherein said serrations are rectilinear. ### Claim 12 (depends on 10) The bit as recited in claim 10 further comprising two or more flutes extending longitudinally along the shaft and positioned intermediate said cutting edges. ### Claim 13 (depends on 12) The bit as recited in claim 12 wherein at least one of the flutes defines a helical surface which extends along a longitudinally extending surface of a periphery of the bit so as to constitute a drill bit. ### Claim 14 (depends on 13) The bit as recited in claim 13 wherein the flutes are defined by the cutting edges and a portion of each of the serrations are positioned on the cutting edge. ### Claim 15 (depends on 10) The bit as recited in claim 10 wherein said serrations define a plurality of teeth on the cutting edges. ### Claim 16 (depends on 15) The bit as recited in claim 15 wherein one or more of said teeth defines spiral segments on said traction surfaces. ### Claim 17 (depends on 10) The bit as recited in claim 10 wherein for at least one said frusto-conical surface the non-cutting edge forms a more acute angle with respect to the axis of the bit than the cutting edge. ### Claim 18 (depends on 10) The bit as recited in claim 10 wherein said serrations are so oriented that a radial distance between said longitudinal axis and a point on a serration increases as a shortest distance between said point and a cutting edge increases.