Cutting tool for plasterboard

{
  "publication_number": "US5219250A",
  "country": "US",
  "kind": "A",
  "title": "Cutting tool for plasterboard",
  "abstract": "A tool for cutting an access hole in plasterboard which is mounted to a wall stud. The tool includes a housing portion, a plug or connector portion and a cutting element such as a screw which has a head and a threaded shank. The housing portion has an exit opening, an interior cavity which forms a seat for the head of the cutting portion and a bore which extends from the exit opening to the cavity. The shank of the screw extends freely through the bore and beyond the exit opening. The plug or connector portion of the tool is threaded into the housing and engages the head of the screw for fixing the screw relative to the housing and includes a shank for insertion into the jaw or chuck of a rotary drive mechanism for rotating the cutting element about its central longitudinal axis.",
  "claims": [
    "1. A tool for cutting an access hole in plasterboard which is mounted to a wall stud said tool being adapted to hold a conventional screw which has a head and a threaded shank, said tool comprising: a) a housing which has an exit opening at one end, a cavity within said housing, and a guide bore which extends from said opening to said cavity, said bore having a central longitudinal axis and being smaller in cross section than said cavity, said cavity being adapted to form a seat for the head of said screw so that the shank of the screw extends freely through said guide bore and beyond said exit opening and is co-axial with said bore, said housing including no cutting edges thereon, b) means for releasably fixing the head of said screw within said cavity, and c) attaching means for operatively connecting said housing to a rotary drive mechanism for rotating said screw about said central longitudinal axis so that movement of the shank of said screw along said axis toward said plasterboard enables the shank of said screw to penetrate said plasterboard and subsequent movement of said shank laterally of said axis enables said shank to cut a slot in said plasterboard.",
    "2. A tool as recited in claim 1, wherein the means for releasably fixing the head of the screw to said housing comprises: a) an access opening in said housing, b) a cylindrical threaded bore which extends from said access opening to said cavity and which is axially aligned with said guide bore, and c) a plug which has a cylindrical threaded shank which is threaded into said threaded bore for engaging the head of said cutting element and for fixedly clamping said head within said cavity.",
    "3. A tool as recited in claim 1, wherein said cavity has a frusto-conical shape, said cavity having a small diameter end at said guide bore and a large diameter end at said threaded bore to form a snug seat for the head of a screw which has a tapered head.",
    "4. A tool as recited in claim 2, wherein said attaching means comprises an elongated attaching shank which is fixed to said plug and which is axially aligned with said threaded shank.",
    "5. A tool as recited in claim 4, wherein said plug has at least two opposite side surfaces between said attaching shank and said threaded shank and which are parallel with the central longitudinal axis of said threaded shank for enabling said plug to be rotated and tightened by a wrench.",
    "6. A tool as recited in claim 2, wherein said plug has at least two opposite side surfaces which are located outside of said threaded bore and which are parallel with the central longitudinal axis of said threaded shank for enabling said plug to be rotated and tightened by a wrench."
  ],
  "cpc": [
    "B23C 5/10",
    "B23B 2228/28",
    "B23B 51/00",
    "B23C 2240/32",
    "Y10T 279/17881",
    "Y10T 407/1908",
    "Y10T 407/1924",
    "Y10T 407/1966",
    "Y10T 408/352",
    "Y10T 408/907",
    "Y10T 408/909"
  ],
  "assignees": [
    "VOORHEES DEREK W"
  ],
  "filing_date": "1991-03-25",
  "publication_date": "1993-06-15",
  "grant_date": "1993-06-15",
  "priority_date": "1991-03-25",
  "application_number": "US-67469391-A",
  "family_id": "24707569",
  "citations": [
    "US2349741A",
    "US2393424A",
    "US3327749A",
    "US376009A",
    "US4384396A",
    "US458640A",
    "US4924578A",
    "US862901A"
  ]
}