# US 8,464,842 B2 · Brake wear measurement system and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,464,842 B2 - Document ID: US8464842B2 - Status: Granted - Kind: B2 - Application number: 12/388,374 - Filed: 2009-02-18 - Published: 2010-08-19 - Granted: 2013-06-18 - Earliest claimed: 2009-02-17 - Assignees: Goodrich Corporation - Applicants: Eric Daniel Cahill - Inventors: Eric Daniel Cahill - Web page: https://patentgrep.com/patent/US8464842B2 ## CPC - F16D 66/026: {indicating different degrees of lining wear} - F16D 2066/003: {Position, angle or speed} - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract A brake measurement system comprising a measurement mechanism for measuring brake wear operatively coupled to a moveable member of a brake assembly is provided. The system further includes a displacement sensor and a visual indicator. The displacement sensor is operatively coupled to the measurement mechanism, wherein movement of the moveable member is converted by the measurement mechanism into a displacement sensed by the displacement sensor. The visual indicator is operatively connected to the measurement mechanism, wherein the visual indicator displays the movement of the moveable member and consequently the wear of the brake stack at a point on the exterior of an aircraft brake housing for inspection. ## Claims ### Claim 1 A brake measurement system, comprising: a measurement mechanism having a first end and a second end; a moveable member operatively coupled near the first end of the measurement mechanism; a visual indicator operatively coupled near the second end of the measurement mechanism, the visual indicator being visible outside a brake housing; a displacement sensor operatively coupled to the measurement mechanism, wherein movement of the moveable member is converted by the measurement mechanism into a displacement measured by the displacement sensor and the visual indicator; and a mechanical calibration mechanism operatively coupled to the displacement sensor and capable of being detachably connected to the measurement mechanism. ### Claim 2 (depends on 1) The brake measurement system of claim 1, wherein the system measures brake wear. ### Claim 3 (depends on 2) The brake measurement system of claim 2, wherein the displacement sensor further comprises an engagement member operatively coupled to a drill bit. ### Claim 4 (depends on 1) The brake measurement system of claim 1, wherein the measurement mechanism is a twisted spline. ### Claim 5 (depends on 1) The brake measurement system of claim 1, wherein the measurement mechanism is a drill bit. ### Claim 6 (depends on 1) The brake measurement system of claim 1, wherein the measurement mechanism comprises at least one of: rack and pinion assembly, cable and pulley system assembly, hinge, spring, spring loaded cable and threaded bolt assembly, cam and lever assembly, spring loaded lever assembly, pneumatic cylinder, or bent wear pin. ### Claim 7 (depends on 1) The brake measurement system of claim 1, wherein the displacement sensor measures linear displacement. ### Claim 8 (depends on 1) The brake measurement system of claim 1, wherein the displacement sensor measures rotational displacement. ### Claim 9 (depends on 1) The brake measurement system of claim 1, wherein the displacement sensor measures angular displacement. ### Claim 10 (depends on 1) The brake measurement system of claim 1, further comprising a connector in electronic communication with the displacement sensor which communicates a displacement measured by the displacement sensor. ### Claim 11 (depends on 1) The brake measurement system of claim 1, wherein the moveable member is a brake pressure plate. ### Claim 12 (depends on 1) The brake measurement system of claim 1, wherein the moveable member is an actuator head which engages a brake pressure plate. ### Claim 13 (depends on 12) The brake measurement system of claim 12, wherein the measurement mechanism is a twisted spline. ### Claim 14 (depends on 12) The brake measurement system of claim 12, wherein the measurement mechanism is a drill bit. ### Claim 15 A brake measurement system, comprising: a measurement mechanism, having a first end and a second end; a moveable member operatively coupled near the first end of the measurement mechanism, wherein the moveable member is at least one of a brake pressure plate or an actuator head which engages the brake pressure plate; an angular displacement sensor, operatively coupled to the measurement mechanism, wherein movement of the moveable member is converted by the measurement mechanism into an angular displacement measured by the angular displacement sensor; a mechanical calibration mechanism operatively coupled to the displacement sensor and capable of being detachably connected to the measurement mechanism; an interface bushing coupled to a scraper and operatively coupled to the displacement sensor, wherein the scraper is in contact with a measured surface of the measurement mechanism; a connector in electronic communication with the angular displacement sensor which communicates a displacement measured by the angular displacement sensor; and a visual indicator operatively coupled near the second end of the measurement mechanism, the visual indicator being visible outside a brake housing. ### Claim 16 A brake measurement system, comprising: a measurement mechanism having a first end and a second end; a moveable member operatively coupled near the first end of the measurement mechanism; a visual indicator operatively coupled near the second end of the measurement mechanism, the visual indicator being visible outside a brake housing; a displacement sensor operatively coupled to the measurement mechanism, wherein movement of the moveable member is converted by the measurement mechanism into a displacement measured by the displacement sensor and the visual indicator; and an interface bushing coupled to a scraper and operatively coupled to the displacement sensor, wherein the scraper is in contact with a measured surface of the measurement mechanism. ### Claim 17 (depends on 16) The brake measurement system of claim 16, wherein the displacement sensor further comprises an engagement member operatively coupled to a twisted spline.