Apparatus for selective alteration of operating parameters of a door
First Claim
1. An apparatus for controlling opening and closing of a door, comprising:
- (A) a cylinder for guiding a piston linearly along an axis, said piston having a slot and a rack gear formed within said slot, and a pinion gear engages said rack-gear of said piston, said pinion gear being coupled to a connecting arm for moving the door;
(B) a spring that provides a door closing force, said door closing force urging said piston in a first direction along said axis, wherein said cylinder and said piston form a first fluid chamber, and said door closing force is dampened by a flow of fluid from said first fluid chamber; and
(C) a rotatable drive screw that provides a door opening force, said door opening force urging said piston in a second direction along said axis, said second direction being opposite said first direction;
wherein said spring and said rotatable drive screw are positioned on opposite sides of said piston.
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Accused Products
Abstract
Apparatus is are disclosed for selective alteration and control of door movement modes, the apparatus being primarily non-hydraulic and incorporated with a known mechanism which is functional independently from the apparatus in one mode of operation and which includes a piston for controlling door closing characteristics by selected fluid flow within the mechanism. The apparatus includes a motor driven lead screw having a linearly movable shuttle unit mounted thereon, the shuttle unit being positioned relative to the piston of the mechanism to accommodate nonattached contact with the piston to urge the piston, when the shuttle unit is moved, in a direction that will at least provide selective assistance with door opening in another mode of operation.
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Citations
16 Claims
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1. An apparatus for controlling opening and closing of a door, comprising:
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(A) a cylinder for guiding a piston linearly along an axis, said piston having a slot and a rack gear formed within said slot, and a pinion gear engages said rack-gear of said piston, said pinion gear being coupled to a connecting arm for moving the door; (B) a spring that provides a door closing force, said door closing force urging said piston in a first direction along said axis, wherein said cylinder and said piston form a first fluid chamber, and said door closing force is dampened by a flow of fluid from said first fluid chamber; and (C) a rotatable drive screw that provides a door opening force, said door opening force urging said piston in a second direction along said axis, said second direction being opposite said first direction; wherein said spring and said rotatable drive screw are positioned on opposite sides of said piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification