Patent ID: 8596425
Filing Date: 2013-12-03
Classification: B23Q

Abstract:
1. A brake structure of a rotary table comprising: an inwardly facing peripheral surface and an outwardly facing peripheral surface that are coaxially formed on a rotatable table; an outer stationary portion that is provided to a stationary member rotatably supporting the rotatable table and defines an outer hydraulic chamber; and an inner stationary portion that is provided to the stationary member, is arranged radially inward from the outer stationary portion and defines an inner hydraulic chamber, wherein the outer stationary portion comprises an outer braking member that is elastically deformed in a radial direction by expansion of the outer hydraulic chamber to push either the inwardly facing peripheral surface or the outwardly facing peripheral surface formed on the rotatable table, while the inner stationary portion comprises an inner braking member that is elastically deformed in a radial direction by expansion of the inner hydraulic chamber to push either the outwardly facing peripheral surface or the inwardly facing peripheral surface that is not pushed by the outer braking member.