That is called a stretcher and you brace your feet against it.
"Ethel Morton at Chautauqua"
Mabell S. C. Smith
Last year there was a boy knocked down by a cable-car at our corner; I got to my gate just as they were carrying him off on a stretcher.
"The Greater Inclination"
Edith Wharton
As I threw back the huge oak door someone brushed past me, calling "Two men and a stretcher," and there in the brilliant moonlight I beheld the most ghastly spectacle I had as yet witnessed.
"My Home In The Field of Honor"
Frances Wilson Huard