Operating mechanism for a roof window
AssigneeAmerock Corporation
InventorRobert F. Lense
Life of this patent
Estimating the term…
Abstract
The sash of a roof window is swung between closed and open positions in response to the extension and retraction of a pair of pivotally supported crossed arms which are adapted to be swung by an operating mechanism whose mechanical advantage increases as the sash moves from its closed position to its open position. The increasing mechanical advantage of the operating mechanism offsets the decreasing opening force exerted by counterbalance springs during opening of the sash and enables the sash to be opened through its entire range with relatively constant manual effort. The initial preload in the counterbalance springs may be selectively adjusted to compensate for the weight of a particular sash and the pitch of a particular roof.
Claims9
A window having a frame, a sash having first and second opposite end portions, means pivotally connecting said first end portion of said sash to said frame and supporting said sash to swing between open and closed positions about a laterally extending axis, and mechanism on said frame adjacent the second end portion of said sash for moving said sash between said positions, said mechanism comprising first and second arms each having one end portion connected to the second end portion of the sash to swing with and to move laterally along the sash, said first and second arms having opposite end portions supported on said frame to turn about first and second laterally spaced axes, respectively, selectively operable means located between said first and second axes for swinging said first and second arms simultaneously but oppositely about said first and second axes, respectively, in either an opening direction or a closing direction, said arms extending and pushing said sash to said open position when said arms are swung in said opening direction, said arms retracting and pulling said sash to said closed position when said arms are swung in said closing direction, and first and second torsion springs coaxial with said first and second axes and connected between said frame and said first and second arms, respectively, said springs being wound as said arms are swung in said closing direction and then unwinding as said arms are swung in said opening direction thereby to assist in moving said sash to said open position.
A window having a frame, a sash having first and second opposite end portions, means pivotally connecting said first end portion of said sash to said frame and supporting said sash to swing between open and closed positions about a laterally extending axis, and mechanism on said frame adjacent the second end portion of said sash for moving said sash between said positions, said mechanism comprising first and second arms each having one end portion connected to the second end portion of the sash to swing with and to move laterally along the sash, said first and second arms having opposite end portions supported on said frame to turn about first and second laterally spaced axes, respectively, first and second laterally spaced drive members supported on said frame between said first and second axes to turn about axes paralleling said first and second axes, a first drive link pivotally connected to said first drive member and to said opposite end portion of said first arm, a second drive link pivotally connected to said second drive member and to said opposite end portion of said second arm, selectively operable means for turning said drive members simultaneously but oppositely in either an opening direction or a closing direction, said first and second drive members acting through said first and second links to push on said first and second arms and swing said arms in opposite directions about said first and second axes, respectively, when said drive members are turned in said opening direction whereby said arms extend and push said sash to said open position, said first and second drive members acting through said links to pull on said first and second arms and swing said arms reversely about said first and second axes, respectively, when said drive members are turned in said closing direction whereby said arms retract and pull said sash to said closed position, and first and second torsion springs coaxial with said first and second axes and connected to said first and second arms, respectively, said springs being wound as said arms retract and then unwinding as said arms extend thereby to assist in moving said sash to said open position.
Dependencies are inferred from the claim text.