Abstract: A chuck assembly for a tool bit includes a spindle with a quick release mechanism and is adapted to prevent undesired axial retraction of the tool bit from the spindle. The tool bit includes a shank portion with a circumferential groove. A longitudinally extending bore is provided in the spindle for receiving the shank portion of the tool bit. The shank is retained in the bore by detent balls extending into the bore and against the circumferential groove. The balls are disposed around the shank in an opposing manner to help center the shank. Attempted axial extraction of the tool bit from the bore without release of the balls locks the balls against a retaining face and a biased locking shoulder preventing extraction of the tool bit from the bore.

Abstract: A chuck assembly for a tool bit includes a spindle with a quick release mechanism and is adapted to prevent undesired axial extraction of the tool bit from the spindle. The tool bit includes a shank portion with a circumferential groove. A longitudinally extending bore is provided in the spindle for receiving the shank portion of the tool bit. The shank is retained in the bore by detent balls extending into the bore and against the circumferential groove. The balls are disposed around the shank in an opposing manner to help center the shank. Attempted axial extraction of the tool bit from the bore without release of the balls locks the balls against a retaining face and a biased locking shoulder preventing extraction of the tool bit from the bore.

Abstract: There is disclosed a typewriter carriage control mechanism which is used with a single element print head which is constructed and arranged for transverse movement across the typewriter in which a ratchet wheel is connected to the regular spring for moving the carriage in a first direction and having a sensor disclosed in ratchet wheel tooth confronting relationship which provides signals representative of radial movement of the ratchet wheel in which the wheel rotational movement is controlled by pawl devices which is actuated by a pair of solenoids to control the forward movement of the carriage. The backspacing movement of the carriage is controlled through another solenoid mechanism and each of the solenoids are controlled through the use of electronic circuits which receive data information representative of the printing function and the functions of spacing, carrier return, line return, tab, back space, and a nonescapement and correction feature operation.