56 engage corresponding aperture edges 58 in the anchor plate 44 as a tongue and groove arrangement when the pin 40 shifts laterally during wind loads the floor mounted anchor plate 44 includes a pin insertion aperture 60 that is sized to accommodate the engagement pin 40 below the pin insertion aperture 60 and covered by the anchor plate 44 is a relief pocket 62 to allow insertion and proper operation of the engagement pin 40 the engagement pin 40 and mounting plate 44 are preferably constructed from cold rolled steel but may be constructed of other suitable materials well known in the art referring to fig5 the cooperating tongue and groove arrangement of the engagement pin 40 and the anchor plate 44 is shown as the garage door 10 is subjected to wind loads the door may shift forward or backward with respect to the building aperture 12 positive pressure wind loads will tend to force the garage door 10 inward while negative pressure wind loads will tend to pull the door outward in each case the engagement pin 40 will be forced against corresponding front or rear edges 58 within the associated anchor plate aperture 60 with this arrangement the engagement pin groove.