Patent ID: 6510586
Filing Date: 2003-01-28
Classification: E05F,E05Y,Y10T

Abstract:
A door closer for a connected pivot-hung door, said door closer comprising:a spring being configured and disposed to be stretched to store energy upon opening of a connected pivot-hung door; said spring being configured to supply a closing force to close the connected pivot-hung door; a transmission arrangement; a linkage being configured to connect said transmission arrangement to the connected pivot-hung door and being configured to move the connected pivot-hung door; said transmission arrangement being configured and disposed to connect said spring to said linkage to permit transfer of force from said linkage to said spring to store energy in said spring upon opening of the connected pivot-hung door, and to permit transfer of force from said spring to said linkage to move said linkage upon closing of the connected pivot-hung door; and said transmission arrangement comprising: a shaft being connected to said linkage; a first transmission gear wheel being connected coaxially to said shaft; a second transmission gear wheel being engaged in mesh with said first transmission gear wheel substantially constantly throughout rotation of each of said transmission gear wheels; said first transmission gear wheel comprising: a circular gear rim; a geometric center point; gear teeth being disposed on said circular gear rim and being symmetrically disposed with respect to said geometric center point; an axis of rotation about which said first transmission gear wheel rotates; said first transmission gear wheel being mounted at said axis of rotation; and said axis of rotation being eccentrically disposed a substantial predetermined distance from said geometric center point to permit eccentric rotation of said first transmission gear wheel; said second transmission gear wheel comprising: a circular gear rim; a geometric center point; gear teeth being disposed on said circular gear rim of said second transmission gear wheel and being symmetrically disposed with respect to said geometric center point of said second transmission gear wheel; an axis of rotation about which said second transmission gear wheel rotates; said second transmission gear wheel being mounted at the axis of rotation of said second transmission gear wheel; and said axis of rotation of said second transmission gear wheel being eccentrically disposed a substantial predetermined distance from said geometric center point of said second transmission gear wheel to permit eccentric rotation of said second transmission gear wheel; a drive gear wheel being connected coaxially to said second transmission gear wheel; a toothed rack being engaged in mesh with said drive gear wheel and being operatively connected to said spring; and said first transmission gear wheel and said second transmission gear wheel being configured and disposed to permit the distance between the axis of rotation of said first transmission gear wheel and the axis of rotation of said second transmission gear wheel to remain substantially constant throughout the eccentric movement of said meshed, transmission gear wheels; said gear teeth of each of said first transmission gear wheel and said second transmission gear wheel being disposed with respect to their corresponding axis of rotation to provide different mechanical advantages between said meshed, transmission gear wheels dependent upon the angular position of the connected pivot-hung door over the rotation of the connected pivot-hung door; and said first and second transmission gear wheels being configured and disposed to provide differences in the moments to the connected pivot-hung door dependent upon the angular position of the connected pivot-hung door over the rotation of the connected pivot-hung door, and to provide differences in the moments to said shaft dependent upon the angular position of the connected pivot-hung door over the rotation of the connected pivot-hung door.