Patents Assigned to Norman Holtzman
  • Film strip advance mechanism
    Patent number: 3937568
    Abstract: Advance shaft carries a sprocket for film engagement and carries manual knob for manually-controlled rotation. Framing shaft is rotatable with respect to projector housing and has an o-ring therebetween to serve as a drag brake. Advance shaft is detented with respect to framing shaft by means of an embracing spring. The drag brake of the framing shaft has a greater torque than the detent of the advance shaft with respect to the framing shaft.
    Type: Grant
    Filed: February 21, 1974
    Date of Patent: February 10, 1976
    Assignee: Norman Holtzman
    Inventor: Hiroshi Kira