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.

Origin of box frame

First recorded in 1875–80

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

A cargo-cover of light canvas not only closely fits the bottom and sides of the box-frame but overlaps the top.
True Tales of Arctic Heroism in the New World | Adolphus W. Greely
To produce this effect a heavy box frame is made, and over it is tightly drawn a calf skin.
Magic, Stage Illusions and Scientific Diversions Including Trick Photography | Albert A. Hopkins
The birds had taken one of these for a door, and built a nest inside, in the box frame over a window.
The Children's Book of Birds | Olive Thorne Miller
At the opposite end of the box frame a counterweight was attached which balanced about 700 lb.
Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 | B. H. M. Hewett
The leather is drawn over the springs and tacked to the outside of the open box frame.
Mission Furniture | H. H. Windsor

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