An anchor detachably connects a wheelchair securement apparatus to a support surface within a motor vehicle and includes a plate having a top surface defining an opening therein, a receiving member secured to the plate and defining an elongated bore to receive and engage a pin coupled to the wheelchair securement apparatus, a plunger within and axially movable along the bore, and a first biasing member between a bottom surface of the plunger and a wall of the bore. The plate and the receiving member are together mountable to the support surface. The first biasing member acts against the bottom surface of the plunger to bias the plunger away from the wall of the bore toward the opening defined through the plate, and the plunger movable toward the wall of the bore against a biasing force of the first biasing member.