Official Gazette of the United States Patent Office Volume 173

Official Gazette of the United States Patent Office Volume 173

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Description

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ... upon said head beam, a shovel mounted in said carrier, means for sliding the carrier, means for moving said inner frame and toggle joint braces to prevent movement of said outer frame. 3. A tunnel excavating machine comprising an extensible frame, traction wheels for said frame, a shovel mounted to slide transversely of said frame, means for sliding said shovel, means for extending said frame and toggle joint braces to prevent both lateral and longitudinal movement of said frame during the process of excavating. 4. A tunnel excavating machine comprising an extensible frame, traction wheels therefor, a shdvel mounted to slide transversely of said frame, means for adjusting said shovel vertically, means for sliding said shovel, means for extending said frame and toggle bracing means to prevent movement of said frame. 5. A tunnel excavating machine comprising an inner and an outer frame movable longitudinally with relation to each other, traction wheels for said outer frame, a rack upon said outer frame, a worm gear upon said inner frame cooperating with said rack whereby said inner frame is moved with relation to said outer frame, a shovel mounted upon and slidable transversely of said inner frame, means for adjusting said shovel vertically, means for sliding said shovel and toggle braces for said frames to prevent movement thereof in certain directions. A tool holder comprising a tool support having its forward end beveled inward toward its lower face, the upper face of said support having a relatively short under cut notch formed therein adjacent its forward end, said forward end having an aperture therein for the reception of a tool shank, a clamp, the length thereof being greater than the shortest distance between the under cut notch...show more

Product details

  • Paperback | 1054 pages
  • 189 x 246 x 53mm | 1,837g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236808290
  • 9781236808295