Patent ID: 7322496
Filing Date: 2008-01-29
Classification: B22D

Abstract:
1. A rotary nozzle brick body, comprising: first circular portions having a radius of C+(D/2)+A formed on both sides of a center X of the brick body; second circular portions having a radius of C+(D/2)+B formed around the center X of the brick body perpendicularly to the direction of the first circular portions, in a range of Θ=40 ±10° in terms of the central angle of the brick; and third circular portions having a radius of (D/2)+B and being formed around an intersections Z obtained by connecting a circular line drawn with a radius C around the center X to both end points of the second circular portions, where, when a fixed brick body with single nozzle hole and the slide brick body with at least a single nozzle hole having the same form with the fixed brick body and face contacting the same to slide-rotate are collectively referred to as the rotary nozzle brick body, A is a safety margin at the time of a 90° full-closed state of the nozzle hole in a slide brick body, B is a safety margin at the time of a full-opened state of the nozzle hole in the brick body, C is a distance between the center X of the brick body and the center Y of the nozzle hole, D is the diameter of the nozzle hole in the brick body, and C>4D/π and B>A, wherein a planar shape is made a substantially elliptical shape by connecting the first circular portions and the third circular portions with tangent lines.