Drywall Cutting tool

{
  "publication_number": "US4870757A",
  "country": "US",
  "kind": "A",
  "title": "Drywall Cutting tool",
  "abstract": "A drywall cutting tool having an elongated handle portion and an elongated blade portion, the handle portion being of cylindrical configuration over most of its length and having a tapered end and a rounded edge, and a closed loop finger guard projecting laterally from the tapered end portion of the handle. The blade portion has an inner end captured in the handle and a pointed tip, and is of substantially uniform width and thickness along its length. The tip end has a pair of inclined sharpened edges converging to form a point, and the blade has a sharpened upper longitudinal blade edge along a portion of its length and a lower longitudinal edge of the blade formed with a row of saw teeth along its entire length.",
  "claims": [
    "1. A drywall cutting tool having an elongated handle portion and an elongated blade portion arranged serially along a longitudinal axis of the tool, the handle portion being of cylindrical configuration over a major portion of its length and having a tapered first end portion nearest the blade and a rounded end portion at the handle end opposite the blade, a closed loop finger guard projecting laterally from the tapered portion of the handle to receive a finger of the user and facilitate manipulation of the tool, and the blade portion being an elongated thin blade member having an inner end captured in embedded relation in the handle and a pointed tip end at the opposite end of the blade remote from the handle, the blade having substantially uniform width and thickness along its length from the handle to the tip end and the tip end having a pair of inclined sharpened edges converging to form a point, the blade having a first and second spaced longitudinal edges paralleling the longitudinal axis of the tool, the first longitudinal blade edge being sharpened along a portion of its length from a juncture with the inclined sharpened edges forming said pointed tip and the second longitudinal edge of the blade being formed with a row of saw teeth along its entire length, said blade being removably captured in said handle portion, the handle portion being formed in two halves having flat faces to be disposed in abutment with each other in assembled relation, the flat faces of the handle halves having like blade receiving cavities therein shaped to conform to and receive an end portion of the blade therein in tightly nested relation, the blade having a hole in the end portion thereof received in the handle cavities and the handle having a fastener screw extending through a portion of a handle halves and through said hole in the blade, one edge of the end portion of the balde receied in said cavities in said handle halves having a triangular notch therein and said recesses having a triangular nose formation conforming to said notch in the blade end portion to be interfitted therein and assist in retaining the blade in assembled relation in the handle.",
    "2. A drywall cutting tool as defined in claim 1, wherein said inclined sharpened edges at the tip of said blade are inclined at like angles with the longitudinal axis of the tool defining substantially an isosceles triangular shaped pointed tip.",
    "3. A drywall cutting tool as defined in claim 1, wherein said saw teeth are of right triangular configuration having one edge of each tooth inclined from an outermost point of each tooth toward said pointed tip end at similar angles, and the other edge of each tooth extending in a direction perpendicular to the longitudinal axis of the tool.",
    "4. A drywall cutting tool as defined in claim 2, wherein said saw teeth are of right triangular configuration having one edge of each tooth inclined from an outermost point of each tooth toward said pointed tip end at similar angles, and the other edge of each tooth extending in a direction perpendicular to the longitudinal axis of the tool."
  ],
  "description_excerpt": "The present invention relates in general to compound tools capable of cutting and sawing operations, as desired, by the user, and more particularly to a drywall cutting tool having a blade provided with a penetrating pointed tip and having a sharpened cutting edge section along one edge thereof and a sawing edge along the other edge thereof, especially adapted for cutting drywall panels to provide shaped openings therein and trimming of edge portions to desired configurations.\n\nHeretofore, cutting tools customarily used for cutting dry wall panels to desired configurations during installation of the drywall have involved blades which taper from point to handle and are relatively long, and have been found to be subject to frequent bending during use. Also, the length of such customarily used cutting tools for drywalls in such that the user sometimes unintentionally pierces drywall which may be located behind the drywall being cut, thus damaging already installed drywall panels. Furthermore, injury to the user's hand has occurred when the hand unintentionally slips during use of the conventional drywall cutting tools and obtaining sufficiently secure holding grip on the handle without slippage has been difficult to achieve. Additionally, when the blade of such conventional tools becomes dull, it must be withdrawn from service to be sharpened, and if it has already been sharpened a number of times, such that further sharpening would misshapen the blade, it must be discarded.",
  "cpc": [
    "B26B 5/005",
    "B23D 51/01",
    "B23D 51/10",
    "B25G 1/102",
    "B25G 3/26"
  ],
  "ipc": [
    "B23D 51/01",
    "B23D 51/10",
    "B25G 1/10",
    "B25G 3/26",
    "B26B 5/00"
  ],
  "inventors": [
    "Hugh J. Kirkpatrick",
    "Thomas J. Lee",
    "James M. Lee"
  ],
  "filing_date": "1988-07-05",
  "publication_date": "1989-10-03",
  "grant_date": "1989-10-03",
  "priority_date": "1988-07-05",
  "application_number": "US-21534788-A",
  "family_id": "22802625",
  "cited_by_count": 34,
  "citations": [
    "US2685734A",
    "US3453651A",
    "US4524514A"
  ]
}