| 摘要 |
Applicant: Tyman H. Fikse Title: Adjustable Pressure Bearings and Retainer for Cutting Rims of Cutters for Tunneling Machines Twin combined radial-and thrust antifriction bearings in a mounting for a rotatable member, such as a tunneling cutterhead or a tunneling cutter, can be tightened or preloaded by pressing spaced bearing races against a spacer ring therebetween to contract the spacer ring. Alternatively, the rotatable member may be a cutter composed of a rim mounted on a hub having an external circumferential groove extending partially under the base of such rim by a retaining ring received in such groove and having portions thereof staked beneath the rim to anchor the retaining ring in place. The cutting rim may be of generally equilateral triangle cross section having opposite base angles clipped to provide narrow parallel walls and the apex being truncated to provide a crest included angle of 80 degrees to 100 degrees. The slant slides of the cutting rim are concave to enable the apex of the rim to ha sharpened more effectively. |
