Tank filler tube lock

In a combination with a tank filler tube, a locking device comprising:

• sleeve means for insertion in said tank filler tube, and defining a tube inside wall to provide slidable sealing engagement with said tube inside wall;
• annular collar means, sized for slidable insertion into said sleeve means, and containing adjustable, radially projecting members for bearing and securing against the inside wall of said sleeve means;
• said annular collar means having its inside diameter surface stepped in two levels, an upper and a lower level, to provide retaining surfaces for two disk members;
• said lower level stepped to a smaller diameter below said upper level;
• said annular collar means having a lock hole bored axially adjacent to said inside diameter edge for purpose of accommodating a locking element;
• a first disk member, sized to fit the inside diameter of the upper level of said annular collar means and containing a first off-center opening which is large enough to accept a filler hose nozzle;
• said first disk member having a threaded screw member fixedly attached at its center and projecting downwards perpendicular to the plane of the disk;
• a second disk member which is sized to fit the inside diameter of the lower level of said annular collar means;
• said second disk member containing a threaded hole at its center for receiving the threaded screw member of said first disk member;
• said second disk member containing a first off-center cutout which can be aligned with said first off-center opening in said first disk member;
• a locking element, including a cylindrical lock, which is located in an axial lock hole bored through said annular collar means, and extending normally through the inside edge of said annular collar means and through an opening in said first disk member and in said second disk member to prevent rotation of said disks about their axis;
• said cylindrical lock, when unlocked by insertion and rotation of a key, able to be pushed downwards to an unlocked position;
• said off-center openings in each said disk capable of being aligned in open configuration or misaligned in closed configuration;
• said locking element being adapted to unlock and thereby disengage for rotation about its axis said first disk, permitting said off-center openings in said disks to become aligned, thus allowing said tank filler tube to be utilized for filling purposes.

In combination with a tank filler tube, drain pipe or other fluid egress means, a locking device comprising:

• an annular collar, formed of two cylindrical sections joined axially together:
• an upper section having a threaded outside diameter and a lower section having an outside diameter greater than the upper section;
• said annular collar including, attached to its lower section outer circumference, a means for locking in place;
• said upper section having a pin projection located on its upper annular surface;
• said lower section having a threaded inside diameter surface to permit attachment by this means to said tank filler tube or other tube projection;
• a disk member, having an off-center opening in its surface;
• said opening of a size large enough to accept a filler hose nozzle;
• said disk member having a first hole located near its circumferential edge, said hole sized to accept said pin projection on top of said annular collar;
• said disk member, when placed on top of said annular collar, being held in place and prevented from rotation;
• a cap member, having a cylindrical shape with one surface forming a cylinder head;
• said cylinder head having an off-center hole bored in its surface and of a size large enough to accept a filler hose nozzle;
• said cap member having its inside diameter surface sized to fit the upper section of said annular collar and threaded to permit fastening to it;
• said cap member having attached to its outside circumference surface, means for locking in place which are the same as said locking means attached to said annular collar;
• said cap member, having its off-center opening located such that when said cap member is assembled with said disk member on said annular collar, and rotatably coupled so as to match locking means position with said annular collar locking means;
• the assembly off-center openings are misaligned in closed configuration, preventing use of the device for filling or emptying.