Patents Assigned to David A. Screen
  • Portable drilling apparatus
    Patent number: 5282704
    Abstract: Portable drilling apparatus provided with a support by means of which it can be secured to a work member and mounting means for a cutting tool including a mounting member having a vertically extending elongate part within which a drive spindle is rotatably mounted, the drive means including an elongate toothed gearwheel driven by a motor held in a fixed position in the support, a toothed gear carried by the drive spindle engaging the elongate gearwheel and sliding axially relative thereto.
    Type: Grant
    Filed: May 22, 1992
    Date of Patent: February 1, 1994
    Assignees: David A. Screen, Michael D. Wooley
    Inventor: David A. Screen