With Screwdriver Patents (Class 7/165)
  • Combination drill and screwdriver
    Patent number: 4092753
    Abstract: A combination screwdriver and drill attachment for a power tool including in one embodiment a bit having the distal end formed as a Phillips-head screwdriver for use not only as a screwdriver but for use in boring pilot holes for screws as well as performing counterboring and countersinking operations. In a second embodiment the combination screwdriver and drill attachment includes a screwdriver provided with a longitudinal passage through which a drill bit retractably passes.
    Type: Grant
    Filed: April 5, 1976
    Date of Patent: June 6, 1978
    Inventor: Manfred E. Fuhrmann