The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 20, 1996
Filed:
Jan. 25, 1994
Kazunari Kawai, Hirakata, JP;
Norio Mitani, Hirakata, JP;
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JP;
Abstract
Preliminary cutter units of a shield machine provided with preliminary cutters capable of continuously excavating soil in a working place even if main cutters are worn away. In a shield machine comprising a cutter head which is disposed at the front end of a shield body and is rotated by cutter head motors, and a plurality of main cutters which are attached to the front surface of a face plate of the cutter head and are disposed in the radial direction of the cutter head, the shield machine further comprises preliminary cutter units each of which is attached to a cutter attachment member provided inside the face plate and swingably supported by quadric links and includes a reaction receiver pad attached to the lower surface of the face plate, a lever which is brought into contact with the reaction receiver pad for receiving external force which is applied to the preliminary cutter, an auxiliary link for connecting the lever and the rear end of the cutter attachment member and a hydraulic jack unit which is mounted on the lever for projecting each of the preliminary cutter from the front portion of the face plate or retracting the projected preliminary cutter from the front portion of the face plate.