open frame

An open frame-work represents a boat; another differing little from it denotes a chariot.

The chief part of the mechanism is carried in an open frame, having journals attached to its two ends, which revolve in bearings.

She removed the short lengths of rusty iron from the open frame and carefully laid them on the ground outside.

"Take care of that open frame," he had added, cautioning her.

The brick-mould was an open frame, with one side prolonged into a handle , exactly as the modern mould.