What's the difference between bedstead and tringle?

Bedstead

Definition:

(n.) A framework for supporting a bed.

Example Sentences:

(1) When my floor was dirty, I rose early, and, setting all my furniture out of doors on the grass, bed and bedstead making but one budget, dashed water on the floor, and sprinkled white sand from the pond on it, and then with a broom scrubbed it clean and white... Further - and this is a stroke of his sensitive, pawky genius - he contemplates his momentarily displaced furniture and the nuance of enchanting strangeness: It was pleasant to see my whole household effects out on the grass, making a little pile like a gypsy's pack, and my three-legged table, from which I did not remove the books and pen and ink, standing amid the pines and hickories ...
(2) Floral wallpaper, curlicued carpet, bedstead in burgundy and gold.
(3) I peer in at the old bedstead and table: life was abominably hard here, and people were often forced to leave when their luck turned.
(4) Rumour that it is as ascetic and simple as Hollande himself – boasting a plain iron bedstead, an ancient television set, a couple of spare suits, shirts and ties, a few books and little else – are true, said Claudine Heiderich, Hollande's assistant.
(5) The two rooms, Edinburgh and Glasgow (with its iron bedstead) are charming and cosy, and the guest lounge has an original wooden floor, log fire and shelves crammed with maps and books on Skye.
(6) And anyone who chooses not to see that has been wilfully latex blindfolded and tied to a bedstead of betrayal by the Anne Summers Beginners’ Bondage Kit of political expediency.