Movable or removable closures – With means mounting closure for reciprocation – With counterbalance
Patent
1982-04-28
1983-11-08
Kannan, Philip C.
Movable or removable closures
With means mounting closure for reciprocation
With counterbalance
E05D 1310
Patent
active
044134452
ABSTRACT:
A sash coupling is adapted to be connected to one side of a sash which slides vertically in parallel channel sash guides mounted within a sliding sash window frame. Secured to the top of the sash coupling is the lower end of a flexible sash cable, the outer end of which extends upward to and around a stationary outer pulley pivotally mounted on a transverse pulley support at the top of the sash guide, whence an intermediate section of the cable extends downward to and around a vertically-movable traveling pulley mounted on a balancing-spring coupling to which the upper end of the elongated sash-balancing tension spring is hooked, whence an inner section of the cable extends upward to an anchorage on the upper end of the sash guide. The lower end of the elongated sash-balancing spring is hooked over the lower end of the sash guide. For a double-hung sliding sash installation, the upper sash is balanced in a similar manner. For By arranging in this manner the sash cable in three sections around two pulleys, the stretch of the sash balancing spring is reduced to but a fraction of the distance through which the sash is moved during the opening operation thereof. This is in contrast to the much greater stretch with a consequently greater varation in the balancing force applied to the sash by a single elongated sash balancing spring stretched directly between the sash and the top of the channel sash guide.
REFERENCES:
patent: 2774119 (1956-12-01), Osten
patent: 2825090 (1958-03-01), Osten
patent: 3091797 (1963-06-01), Prosser
patent: 3133323 (1964-05-01), Robards
patent: 3197819 (1965-08-01), Trout
patent: 3358403 (1967-12-01), Dinsmore
patent: 4170090 (1979-10-01), Wood
patent: 4364199 (1982-12-01), Johnson et al.
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