Locking device for the automatic shift lever of a car

A lock device for an automatic shift lever of a car comprising:

• a control link extending within a knob provided on a top of an automatic shift lever, said control link including a first end protruding from a lateral side of said knob that forms a push button, said push button having an external diameter that is larger than an adjacent portion of said control link such that said push button defines a protruding portion, said control link being formed with a groove at a position spaced from said protruding portion, said groove including a first bevelling surface and a fixing member on one side thereof opposite to said first bevelling surface;
• a shift control rod extending within said knob, said shift control rod being provided at a top end thereof with a sliding block that is received in said groove, said sliding block being formed with a second bevelling surface that is arranged juxtaposed to said first bevelling surface and is inclined at an angle equal to that of said first bevelling surface, said sliding block further including a limiting groove which receives said fixing member before operation of said control link;
• and
• a stop piece selectively rotatably mounted within said knob between at least a first, release position wherein said stop member permits said control link to be shifted within said knob through manual force applied to said push button which causes said fixing member to be released from said limiting groove, said second bevelling surface to slide along said first bevelling surface and said shift control rod to move downward to establish a shiftable state and a second, locking position wherein said stop member abuts said control link to prevent shifting of said control link within said knob.