Attachment for an overhead door
OwnerBruce Edgar Olsoninventor
Life of this patent
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Abstract
An attachment for use with an overhead door having limited head room. The door is made of hingedly connected sections and movable between a closed and an open position on a track. The attachment comprises a first member adapted to be attached to the top section of the door. A second member is pivotally connected to the first member. Track engagement means are attached to the second member and abutment means are positioned on the second member to abut a stop positioned on the exterior of the track when the door is in the closed position. Abutment of the abutment means on the stop acts to stop movement of the second member in the track at a point just prior to the door reaching the closed position.
Claims4
In combination with an overhead door of the type having limited head room, the door comprised of hingedly connected sections and movable between a closed vertical position and an open, horizontal position within the head room on single continuous tracks, one track each located adjacent a door side and each track including an inner roller supporting edge and an outer edge, the improvement comprising an attachment including,
- a first member adapted for rigid attachment to a top corner section of the door and extending inwardly past the inner edge of a track so as to have a part thereof disposed at all times inwardly past said track inner edge,
- a second member in parallel relationship with said first member,
- pivot means connecting said second member to said first member part disposed inwardly of the track inner edge,
- means on the members limiting pivotal movement of the members,
- a shaft and roller assembly carried by said second member with said roller entrained at all times on a single track,
- an abutment flange on said second member at all times in outward proximity of the track outer edge,
- a stop disposed on the outer edge of the track coacting with said abutment flange during door travel, such coaction imparting rotational movement to said second member about the axis of said shaft and roller assembly to thereby advance said pivot means and said first member in a direction to expedite closure of the top door section,
- said stop including angulated limbs, one of said limbs disposed for contact by said abutment flange during door closing travel, another of said limbs of said stop disposed for contact by said abutment flange during initial door opening travel to retard upward travel of the second member and compel occurrence of joint rotational movement of the first and second member about said pivot means, and
- said top section of the door during initial upward door opening movement moving jointly about the axis of said pivot means which axis simultaneously moves away from the track inner edge about the axis of said shaft and roller assembly to thereby retract the top door section toward the rail to provide clearance from overhead obstructions.
Dependencies are inferred from the claim text.