Doorknob security apparatus

A security apparatus for inhibiting key access to a doorknob having a gripping portion with an integral lock and a stem portion, comprising:

• a first semi-cylindrical member;
• a second semi-cylindrical member, said first and second semi-cylindrical members cooperating to form a hollow right circular cylinder for disposal about the doorknob;
• locking means for locking said first and second semi-cylindrical members together about the doorknob;
• a disk shaped member dimensioned to cover the open end of said formed right circular cylinder;
• said disk shaped member having one-half of the periphery thereof integrally molded with the arcuate periphery of said first semi-cylindrical member and disposed perpendicular to the longitudinal axis thereof;
• an arcuate groove disposed along the arcuate periphery of said second semi-cylindrical member and directed radially inward, said groove for receiving the remaining half of the periphery of said disk shaped member such that access to the integral lock of the doorknob is prevented unless said first and second semi-cylindrical members are separated;
• said disk shaped member providing a sealed surface over the integral lock to prevent access thereto;
• and
• restricting means attached to the interior of said formed right circular cylinder about the stem of the doorknob for preventing removal of said formed right circular cylinder, removal of the security apparatus facilitated only by the separation of said first and second semi-cylindrical members.

A security apparatus for inhibiting key access to a doorknob having a gripping portion with an integral lock and a stem portion for attachment to a door, comprising:

• a right circular cylinder housing for being disposed over the doorknob, said housing having:
• a first semi-cylindrical half;
• and
• a second semi-cylindrical half;
• a hinge for attaching one side of each of said first and second semi-cylindrical halves together;
• a lock for securing the remaining sides of each of said first and second semi-cylindrical halves together;
• a circular cover dimensioned to cover the end of said right circular cylinder housing;
• a first annular groove disposed on the periphery of said first semi-cylindrical half and directed radially inward, said first annular groove for receiving one-half of the periphery of said circular cover;
• a second annular groove disposed on the periphery of said second semi-cylindrical half and directed radially inward, said second annular groove for receiving the remaining half of said circular cover;
• said first and second annular grooves preventing access to the edge of said circular cover by a foreign device such that prying of the edge of said circular cover away from said housing is prevented;
• a first semi-annular member disposed on the interior of said first semi-cylindrical half;
• and
• a second semi-annular member disposed on the interior of said second semi-cylindrical half;
• said first and second semi-annular members cooperating to provide a restricted orifice about the stem of the doorknob that will not pass over the gripping portion such that the security apparatus cannot be removed without separation of said first and second semi-cylindrical halves.

A security apparatus for inhibiting key access to a doorknob having a gripping portion with an integral lock and a stem portion for attachment to a door, comprising:

• a right circular cylinder housing for being disposed over the doorknob, said housing having:
• a first semi-cylindrical half;
• and
• a second semi-cylindrical half;
• a hinge for attaching one side of each of said first and second semi-cylindrical halves together;
• a lock for securing the remaining sides of each of said first and second semi-cylindrical halves together;
• a circular cover dimensioned to cover the end of said right circular cylinder housing;
• said circular cover being integrally molded with said first semi-cylindrical half such that the surface thereof is perpendicular to the longitudinal axis of said right circular cylindrical housing;
• an annular groove disposed about the periphery of said second semi-cylindrical half, said annular groove for receiving the remaining periphery of said circular cover such that insertion of a foreign instrument about the edge of said circular cover is impeded;
• a first semi-annular member disposed on the interior of said first semi-cylindrical half;
• and
• a second semi-annular member disposed on the interior of said second semi-cylindrical half;
• said first and second semi-annular members cooperating to provide a restricted orifice about the stem of the doorknob that will not pass over the gripping portion such that the security apparatus cannot be removed without separation of said first and second semi-cylindrical halves.