초록 ▼

A device is disclosed for locking a grate or the like to its receiving frame to make difficult the removal of the grate by an unauthorized person utilizing a makeshift tool. The locking device has a spring loaded latching pin carried by supports secured to the grate. The shoulders provided by either

A device is disclosed for locking a grate or the like to its receiving frame to make difficult the removal of the grate by an unauthorized person utilizing a makeshift tool. The locking device has a spring loaded latching pin carried by supports secured to the grate. The shoulders provided by either a necked portion of the latching pin or by a flange on the latching pin serve to prevent the unlatching of the latching pin against the biasing of the spring by the use of a makeshift tool. In some embodiments the shoulders are inclined at an angle with respect to the longitudinal axis of the latching pin to encourage the slippage of a makeshift tool off from said shoulders to thereby prevent the unlatching of the pin by an unauthorized person using a makeshift tool. In some embodiments, the unlatching hole in the grate is offset from the locking device to prevent the inspection of the locking device by an unauthorized person seeking to discover the manner of operation of the locking device.

대표청구항 ▼

An improved, vandal resistant, grate lock device of the type comprising a grate adapted to fit into a grate receiving frame means; wherein said receiving frame means has a frame flange means extending inwardly into the opening defined by said receiving frame means; wherein said grate lock device is

An improved, vandal resistant, grate lock device of the type comprising a grate adapted to fit into a grate receiving frame means; wherein said receiving frame means has a frame flange means extending inwardly into the opening defined by said receiving frame means; wherein said grate lock device is of the type further comprising: at least one mounting means carried by the grate; a latching means carried by said mounting means; and a means for biasing said latching means to interlock with said frame flange means when said grate is seated on said receiving frame means; and wherein said grate further includes an unlatching hole defined by said grate to permit access to said latching means; wherein the improvement comprises: said latching means including a latching member having a top face facing towards said unlatching hole, and a pair of side faces located on opposite sides of said latching member at an angle with respect to said top face; wherein said top and pair of side faces are inclined at an angle of less than 90 degrees with respect to the longitudinal axis of said latching member at a location adjacent to said top and side faces; wherein the inclination of said top and pair of side faces is for preventing the movement of said latching means against the biasing of said means for biasing by an unauthorized, makeshift tool; and wherein said pair of inclined side faces are adapted to be engaged by an authorized unlatching tool having a pair of working faces adapted to engage said pair of side faces.