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US 4,128,120 AGranted
Tambour door and housing assembly
AssigneeInterRoyal Corporation
InventorFrederick J. Frey
Life of this patent
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AssigneeInterRoyal Corporation
InventorFrederick J. Frey
Estimating the term…
A tambour or roll-top door and housing assembly comprises a tambour door formed of a plurality of longitudinal segments engaged along their adjacent sides by parallel hinge elements, and a housing having a pair of spaced tracks defining a curved path, the door being positioned with its side edges engaging the two tracks respectively and the segments being relatively pivotable when the door slides around the curve between open and closed positions. The assembly further includes a gear having a circular pitch distance between teeth corresponding to the pitch between the door's hinged segments, the gear being rotatable on a shaft with at least one tooth always engaging one door segment, and a Negator.sub.tm spring having one end secured to the bottom of the door and the remaining spiral portion freely rotatable on the gear shaft. Movement of the door toward either closed or open position causes the Negator spring to be further wound or unwound, this spring having the characteristic of constant torque regardless of the degree of winding, so that the door is effectively counter-balanced in all positions.
In a tambour door and housing assembly, the housing including a pair of spaced apart tracks defining a path having a generally vertical first section with top and bottom parts, a generally horizontal second section near the top part of said first section, and a curved third section interconnecting said first and second sections, and a tambour door having top and bottom parts and side edges slidably disposed in said tracks so that the door is movable along said path, said door comprising a plurality of longitudinal segments, each having opposite ends which define said side edges of the door, said segments being situated side-by-side with their adjacent edges pivotally engaged in hinge couplings, with a pitch distance P between said couplings, the improvement in combination therewith of a counter-balancing system comprising:
In a tambour door and housing assembly, the housing including a pair of spaced apart tracks defining a path having a generally vertical first section with top and bottom parts, a generally horizontal second section near the top part of said first section, and a curved third section interconnecting said first and second sections, and a tambour door having top and bottom parts and side edges slidably disposed in said tracks so that the door is movable along said path, said door comprising a plurality of longitudinal segments, each having opposite ends which define said side edges of the door, said segments being situated side-by-side with their adjacent edges pivotally engaged in hinge couplings, with a pitch distance P between said couplings, the improvement in combination therewith of a counter-balancing system comprising:
In a tambour door and housing assembly, the housing including a pair of spaced apart tracks defining a curved path extending from an upper point to a lower point, and a tambour door having top and bottom parts and side edges slidably disposed in said tracks so that the door is movable along said path, said door comprising a plurality of segments, each having opposite ends which define said side edges of the door, said segments being situated side-by-side with their adjacent edges pivotally engaged in hinge couplings, with a pitch distance P between said couplings, the improvement in combination therewith of a counter-balancing system comprising:
Dependencies are inferred from the claim text.