Tunnelling machine
Patent 5443305 Issued on August 22, 1995. Estimated Expiration Date: 
August 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesShield tunneling machine Patent #: 4456305 InventorsAssigneeApplicationNo. 081364 filed on 08/08/1993US Classes:299/33, With mine roof-supporting means299/58, Machine follows cutter into opening formed thereby405/141ShieldExaminersPrimary: Bagnell, DavidAttorney, Agent or FirmForeign Patent References
International ClassE21D 009/08Foreign Application Priority Data1991-10-30 CHAbstractA tunnelling machine for large cross-section tunnels (with a 12 m diameter and more), as well as for excavating loose rocks leading to groundwater, has a shield with a cylindrical case. A front section (1) of the case is rotary. The front face (3) of the rotary section is designed at least outside a central area (11) as a helical heading supporting surface at least approximately full when seen in the axial direction (6) of the tunnel. Preferably, the supporting surface is composed of several helical surfaces (4, 5) that supplement each other in the circumferential and/or radial directions. In the supporting surface is arranged at least one excavating shoulder (12, 13) whose surface is at an angle with respect to the supporting surface. An excavating device is preferably arranged on at least one excavating shoulder (12, 13). In the area of the supporting surface the earth or rocks are supported at the same time as they are excavated exclusively at the excavating shoulder(s).Other References
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