box frame

noun

Architecture. a monolithic reinforced-concrete structure having walls and floors in the form of slabs.
Building Trades. a window frame with pockets for sash weights.

First recorded in 1875–80

A cargo-cover of light canvas not only closely fits the bottom and sides of the box-frame but overlaps the top.

To produce this effect a heavy box frame is made, and over it is tightly drawn a calf skin.

The birds had taken one of these for a door, and built a nest inside, in the box frame over a window.

At the opposite end of the box frame a counterweight was attached which balanced about 700 lb.

The leather is drawn over the springs and tacked to the outside of the open box frame.

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