ApplicationNo. 210452 filed on 03/21/1994
US Classes:473/483, With height adjustment feature74/548, Shaft connections254/98, SCREW411/120And element maintaining member in operative engagement with bolt head or nut
ExaminersPrimary: Shapiro, Paul E.
Attorney, Agent or Firm
International ClassA63B 063/08
AbstractA lock structure which automatically locks the screw drive upon deactivation of the screw drive and automatically unlocks the screw drive upon activation of the screw drive. The locking structure is responsive to the attaching and detaching of a driver such that the detaching of the driver from an input of the screw drive automatically locks the screw drive and attaching the driver to the input of the screw drive automatically unlocks the screw drive. This is achieved by providing an outer locking surface on the screw drive and a locking plate whose axial position is controlled by the position of the drive and having an aperture for mating with the outer locking surface and locking the screw drive.
Field of SearchLocked stationary
Special engaging feature
Rocking head or base
And element maintaining member in operative engagement with bolt head or nut
Member having opening or notch engaging a bolt head or nut on two sides