×

Mold for molding discs

  • US 5,626,890 A
  • Filed: 10/30/1995
  • Issued: 05/06/1997
  • Est. Priority Date: 11/08/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A mold for molding discs, comprising:

  • a stationary mold half on which are mounted a stationary cylindrical member and a stationary mirror plate fixed inside thereof, the stationary mold half defining a stationary side wall of a mold cavity when the mold is closed;

    a movable mold half on which are mounted a movable cylindrical member and a movable mirror plate fixed inside thereof, the stationary mirror plate concentric with the movable mold half, the movable mold half defining a movable side wall of a mold cavity when the mold is closed;

    a stamper set in concentrically on the movable mirror plate;

    an outer peripheral ring fixed so that a large inner peripheral surface thereof is in close contact and concentric with the outer peripheral surface of the mirror plate, of which a small inner peripheral surface defines an outer peripheral surface of the mold cavity, having a protrusion at the lower portion of the small inner peripheral surface so as to prevent leakage of blown air along the inner periphery of the outer peripheral ring; and

    a first air passage in an interior of the outer peripheral ring, the first air passage connected to a second air passage provided in an interior of the movable cylindrical member, the first air passage and the second air passage to blow air into the mold cavity.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×