Patent ID: 7874230

Claim:
A lockable rotary operating handle assembly, comprising: a rotary operating handle mounted on a frame for rotation about a Z axis, a longitudinal dimension of said handle extending laterally in an XY plane, with a bore therein, the axis of the bore extending in an X direction; an elongate blocking bolt slideably mounted in the rotary operating handle so that a first end of said bolt is slideable into a strike in said frame; a rotary drum rotatably mounted in the bore in said operating handle, a longitudinal axis of the drum extending in the X direction, the drum being rotatable about its longitudinal axis; wherein a second end of the blocking bolt is in contact with the rotary drum so that rotation of the drum can move the first end of the bolt into and out of the strike, and when the first end of the bolt is in the strike, the operating handle cannot be rotated about the Z axis; said operating handle having at least one lateral hole therethrough in the XY plane in a Y direction and passing through the bore in the handle, and the drum having at least one throughhole therein, the axis of the throughhole being substantially coaxial with the axis of the lateral hole in the operating handle when the drum is in a rotary position wherein the first end of the bolt is in the strike, so that a member extending through both the throughhole in the drum and the lateral hole in the handle can prevent rotation of the drum to maintain the first end of the bolt in the strike thereby preventing rotation of the handle about the Z axis.