plug assembly may be rotated between a locking and unlocking position to restrain or release the push plate application_number US 85992201 A description referring to the figures the panel lock includes a housing 10 with a recess or cavity 12 the chamber or cavity 12 includes spaced opposed generally parallel sides or sidewalls 14 and 16 each of the sides 14 and 16 include pivot pin openings such as pin opening 22 for receipt of a mounting pin 24 which is provided to pivotally mount a push plate 26 having a configuration generally congruent with the opening of cavity 12 a slidable bolt 28 is mounted in the cavity 12 and is biased by a spring 30 which fits into a bore 32 in bolt 28 to bias the bolt 28 outwardly from cavity 12 through a lateral or side opening 34 in the wall 14 of housing 10 the housing 10 further includes a generally cylindrical bore or counterbore cavity 18 for receipt of a rotatable plug assembly or lock plug 20 the plug 20 is rotatably mounted in the counterbore cavity 18 and includes a plug head 36 which has opposite outwardly extending arcuate sides 38 and 40 comprising a flange the plug head 36 further includes opposite flat sides 42 and 44 connecting the arcuate sides 38 40 in other words the plug head 36 which ordinarily may be circular in shape has sectors removed from the circular plug head 36 resulting in flat sides 42 and 44 that connect the partial peripheral flange sides or sections 38 and 40 the push plate 26 includes a.