Horizontal Extension Spring Counterbalance
Extension springs lying along the horizontal tracks of a sectional door, with a sheave and a safety cable on each side.
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Extension springs lying along the horizontal tracks of a sectional door, with a sheave and a safety cable on each side.
A torsion spring shaft with cable drums that balances a sectional door, mounted over the lintel or at the rear of the tracks.
A direct-drive motor on the shaft that lifts a sectional door through cable drums without springs, with a catch device on each side.
Tension springs enclosed in a channel along each horizontal track of a sectional door, with double holding cables.
Extension springs on the sides of a sectional door, beside the vertical track, with a cable over a pulley on each side.