Pressure relief door with counterweight mechanism
AssigneeGeneral Electric Company
InventorsGordon Timothy Ayshford, Victoria Margaret Arthur, Peter Thomas McGuigan
Life of this patent
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Abstract
A counterweight mechanism that includes a radial arm with a weight and a series of elements interconnected between the door and the arm. The weight provides a closing force when in a first position and provides an opening force when in another position. The weight may be an over center weight and the closing force reduces when the weight moves toward an over center position. The counterweight mechanism may require manual resetting after the weight is in the second position. Door movement may be though an angle that is less than an angle of movement of the radial arm
Claims20
A counterweight mechanism for applying a closing urging force at a first condition to a door and an opening urging force at a second, different condition to the door, the counterweight mechanism including:
- a series of elements operatively connected in sequence and extending from the door, the series of elements moving during movement of the door;
- and
- a radial arm and a weight fixed to the radial arm, the radial arm and weight being pivotally supported and operatively connected to the series of elements for movement of the radial arm and weight during movement of the door and the series of elements, the weight providing the closing urging force that is transmitted through the radial arm and the series of elements to the door when the weight is in a first position, the closing urging force being reduced as the weight moves toward a second position, and the weight providing the opening urging force when the weight is in a third position.
A counterweight mechanism for applying a closing urging force at a first condition to a door and an opening urging force at a second, different condition to the door, the door being supported for pivot movement about an axis, the counterweight mechanism including:
- a series of elements operatively connected in sequence and extending from the door, the series of elements moving during movement of the door;
- and
- a radial arm and a weight fixed to the radial arm, the radial arm and weight being pivotally supported for movement about an axis and operatively connected to the series of elements for pivot movement of the radial arm and weight during simultaneous pivot movement of the door, the radial arm and weight are movable from a first position, in which the weight provides the closing urging force, through a second position and to a third position, in which the weight provides the opening urging force, the pivot movement of the radial arm and weight between the first and third positions is a first angle amount and the simultaneous pivot movement of the door is through a second angle, the second angle is less than the first angle.
A counterweight mechanism for applying a closing urging force at a first condition to a door and an opening urging force at a second, different condition to the door, the counterweight mechanism including:
- a series of elements operatively connected in sequence and extending from the door, the series of elements moving during movement of the door;
- and
- a radial arm and a weight fixed to the radial arm, the radial arm and weight being pivotally supported for movement about an axis and operatively connected to the series of elements for pivot movement of the radial arm and weight during simultaneous pivot movement of the door, the radial arm and weight are movable from a first position, in which the weight provides the closing urging force, through a second position and to a third position, in which the weight provides the opening urging force;
- the counterweight mechanism being configured such that once the radial arm and weight are in the third position the counterweight mechanism cannot independently move the radial arm and weight toward the first and second positions, and a resetting force from a source other than from the counterweight mechanism and the door is required to move the radial arm and weight from the third position toward the first and second positions.
Dependencies are inferred from the claim text.