Operating mechanism for a roof window

Details Operating mechanism for a roof window Operating mechanism for a roof window

1991-11-18

1993-01-19

Kannan, Philip C.

Movable or removable closures

With means mounting closure for swinging

With biasing means

49324, 74 8914, E05F 110, E05F 1100

Patent

active

051798034

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.

REFERENCES:
patent: 2735676 (1956-02-01), Lange
patent: 3085797 (1963-04-01), Anderberg et al.
patent: 3220523 (1965-11-01), Hepner
patent: 4617758 (1986-10-01), Vetter
patent: 5097629 (1992-03-01), Guhl et al.

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