Wooden ring with Springs

[Speedbag]

Interesting swivel on this vintage Wooden rebound ring.

Never seen "spring" shock absorbers on a speed bag setup either.

Antique All Wood Boxing Speed Bag Mounting Bracket, Early 1900's

[Dutchman]

I've seen a couple of these. From what I've been able to gather, this was another attempt at reducing vibration, more precisely "the noise" transmitted through the walls.