Tilt-up door
AssigneeHP Doors, LLC
InventorRoland W. Betker
Life of this patent
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Abstract
A tilt-up door for a building having an opening including a door frame with vertical track members, cam surfaces extending laterally from the vertical tracks at the upper portion of the tracks and a door sized to span the opening. The door can be pivotally coupled with rollers disposed within the vertical tracks and cam followers extending laterally from the upper portion of the door to contact the cam surfaces. When an upwardly directed motive force acts on the door the cam followers come into engagement with the cam surface to lift the door generally vertically and then rotate the door inwardly as the door is raised into an open raised position.
Claims10
A tilt-up door system for a building having an opening comprising:
- a door frame comprising a pair of vertically juxtaposed members defining a vertical track;
- at least one first cam surface extending generally laterally from the vertical track at an upper portion thereof, wherein the at least one first cam surface has a first steep inclined segment, a second inclined segment and a third descending segment;
- a door sized to span the opening and pivotally coupled with at least one roller disposed within the vertical track, and at least one cam follower extending laterally from an upper portion of the door in register with the at least one first cam surface;
- whereby when the door is placed in alignment with the opening in a closed, lowered position, the at least one roller is disposed within the vertical track and the at least one cam follower is located adjacent to the at least one first cam surface, and an upwardly-directed motive force acts upon the door, the at least one cam follower comes into abutment with the first steep inclined segment of the at least one first cam surface which moves the door generally vertically, then into abutment with the second inclined segment of the at least one first cam surface which rotates the upper portion of the door inwardly, and then into abutment with the third descending segment of the at least one first cam surface to bring the door into an opened, raised position.
Dependencies are inferred from the claim text.