# US 5,351,333 A · Optical fiber cleaver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,351,333 A - Document ID: US5351333A - Status: Granted - Kind: A - Application number: 08/127,826 - Filed: 1993-09-28 - Granted: 1994-09-27 - Earliest claimed: 1993-09-28 - Inventors: Arthur E. Chambers - Web page: https://patentgrep.com/patent/US5351333A ## CPC - G02B 6/25: Preparing the ends of light guides for coupling, e.g. cutting - Y10T 83/0333: Scoring - Y10T 83/8776: Constantly urged tool or tool support [e.g., spring biased] - Y10T 225/321: Preliminary weakener - Y10T 225/325: With means to apply moment of force to weakened work - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An optical fiber cleaver is disclosed wherein a blade applies a pre-set force to an optical fiber to form a notch in that optical fiber. In a preferred embodiment, a spring applies a pre-set force to the blade such that should an undue amount of force be applied to the fiber from the blade, the blade will overcome the spring force and not move towards the fiber any further. The cleaver is preferably formed from two pivotally connected handle portions each including holder portions which come into mating contact with each other to provide a stop against further pivoting movement. At that time, the blade is forced into the optical fiber to cleave the optical fiber. In a further feature of this invention, an optical fiber guide provides a stop between an insulated portion of the optical fiber, and a stripped portion. The optical fiber guide is adjustable to adjust the distance between the end of the insulation and the location of the notch. By adjusting the optical fiber guide, one is able to achieve a desired length of stripped fiber between the end of the insulation and the formed notch. ## Claims ### Claim 1 An optical fiber cleaver comprising: first and second handle portions, said first and second handle portions being pivotally connected, and having holder portions, the holder portion of one of said first and second handle portions carrying a blade, and the other of said holder portions being adapted to hold an optical fiber such that when the handle portions are pivoted together to a closed position, said blade contacts the optical fiber held on said other holder portion; and said blade being biased towards said other holder portion when in said closed position by a pre-set force such that when said pre-set force is overcome, said blade does not move further against an optical fiber, said preset force being supplied by a spring. ### Claim 2 (depends on 1) An optical fiber cleaver as recited in claim 1, wherein said pre-set force is provided by a coil spring. ### Claim 3 (depends on 2) An optical fiber cleaver as recited in claim 2, wherein said blade and said spring are received in a bore in said one holder portion. ### Claim 4 (depends on 3) An optical fiber cleaver as recited in claim 3, wherein an adjustable set screw is received in an end of said bore and may be turned to vary the spring force applied to said blade. ### Claim 5 (depends on 1) An optical fiber cleaver as recited in claim 1; wherein said blade is positioned at an angle relative to a plane which is perpendicular to a pivot axis of said first and second handle portions. ### Claim 6 (depends on 5) An optical fiber cleaver as recited in claim 5, wherein said other of said holder portions receives a plastic pad providing an underlying support surface for the optical fiber as said blade contacts the optical fiber. ### Claim 7 (depends on 6) An optical fiber cleaver as recited in claim 6, wherein said plastic pad defines a curved surface facing the optical fiber, and wherein said blade is directed at an angle relative to a pivot axis of said handle portions. ### Claim 8 (depends on 7) An optical fiber cleaver as recited in claim 7, wherein said blade is directed to a center of a radius of curvature of said pad. ### Claim 9 (depends on 1) An optical fiber cleaver as recited in claim 1, wherein an optical fiber guide provides a stop for an insulated portion of said fiber such that a desired length of stripped fiber can be formed between the end of said insulated portion and an end face formed by said blade. ### Claim 10 (depends on 9) An optical fiber cleaver as recited in claim 9, wherein said guide is threaded relative to said holder portion such that said length can be varied. ### Claim 11 (depends on 10) An optical fiber cleaver as recited in claim 10, wherein said holder portion includes a plurality of marks to allow one to select a desired length. ### Claim 12 (depends on 1) An optical fiber cleaver as recited in claim 1, wherein said blade is positioned in said one handle portion such that when said first and second holder portions being pivoted together toward said closed position, said blade faces said other of said holder portions. ### Claim 13 (depends on 12) An optical fiber cleaver as recited in claim 12, wherein said blade is positioned in said one holder portion such that it is effectively brought downwardly into contact with said optical fiber. ### Claim 14 (depends on 1) An optical fiber cleaver as recited in claim 1, wherein said spring is received in a bore which is closed to prevent adjustment of said pre-set force. ### Claim 15 (depends on 14) An optical fiber cleaver as recited in claim 14, wherein said other of said holder portion receives a plastic pad providing an underlying support surface for the optical fiber as said blade contacts the optical fiber. ### Claim 16 An optical fiber cleaver comprising: a blade; a holder portion for holding an optical fiber, an optical fiber guide being fixed to said holder portion, said optical fiber guide having a stop portion such that a predetermined length of stripped optical fiber can move beyond an insulated portion of said optical fiber towards a location where said blade will form a notch in said optical fiber, and such that a desired length of stripped optical fiber will be formed between the notch and the end of the insulation, said stop portion being provided by a bore extending through said optical fiber guide, said bore having a inner diameter selected to be greater than the outer diameter of a stripped optical fiber, and less than the outer diameter of the insulated portion of the optical fiber such that said stop portion will prevent movement of said insulated portion of the optical fiber through said bore. ### Claim 17 (depends on 16) An optical fiber cleaver as recited in claim 16, wherein said guide is threaded relative to said holder portion such that said length can be varied. ### Claim 18 (depends on 16) An optical fiber cleaver as recited in claim 16, wherein said holder portion includes a plurality of marks to allow one to select a desired length. ### Claim 19 An optical fiber cleaver comprising: a pair of pivotally connected handle portions; one of said handle portions carrying a blade; a second of said handle portions carrying a holder portion for holding an optical fiber, an optical fiber guide being fixed to said holder portion, and said optical fiber guide having a stop portion such that a pre-determined length of stripped optical fiber can move beyond said stop portion towards a location where said blade will form a notch in said optical fiber, and such that a desired length of stripped optical fiber will be formed between the notch formed by said blade, and the end of the insulation, said stop portion being provided by a bore extending through said optical fiber guide, said bore having a inner diameter selected to be greater than the outer diameter of a stripped optical fiber, and less than the outer diameter of the insulated portion of the optical fiber such that said stop portion will prevent movement of said insulated portion of the optical fiber through said bore. ### Claim 20 (depends on 19) An optical fiber cleaver as recited in claim 19, wherein said holder portion receives a hard plastic pad acting as an underlying support surface for the optical fiber as said blade contacts the optical fiber.