EP 0010105 B1 19820505 - PAVEMENT PLANING MACHINE
Title (en)
PAVEMENT PLANING MACHINE
Publication
Application
Priority
US 87324978 A 19780130
Abstract (en)
[origin: WO7900563A1] Asphalt or concrete pavement is removed from a road bed by an elongated cutter blade (94) that extends in a downward and forward direction along a cutting plane to a cutting edge. The cutting plane forms an acute angle of between 450 and 550 with the surface of the pavement. The cutter blade is intermittently driven with a force parallel to the cutting plane in the forward direction while the cutting edge penetrates the pavement to drive the cutter blade incrementally in a forward direction and plane on the pavement in a chisel-like manner. A source of vibrations (56, 56') is connected to one end of plural spaced apart resonant beams (54, 54'). At the other end, the beams drive the cutter blade. The source produces a reciprocating force that is transmitted to the blade by the beams each of which has an output that reciprocates about a neutral position responsive to the force of the source. A continuous unidirectional force is applied to the source by a tool carrier (44). The blade advances intermittently along a work path through the pavement responsive to the continuous unidirectional force and the reciprocating force. A gap is held between the neutral output position of the beams and the blade when the blade is unable to advance through the pavement responsive to the continuous unidirectional force and the reciprocating force. Specifically, the force of the source is sufficiently large relative to the unidirectional force to overcome the latter, and to drive the tool holder back away from the blade when the blade is unable to advance along the work path, thereby establishing a protective gap. Cessation of resonance is prevented when the blade encounters an immovable object by establishing the protective gap in the described manner.
IPC 1-7
IPC 8 full level
E01C 23/06 (2006.01); E01C 23/085 (2006.01); E01C 23/12 (2006.01); E02F 5/32 (2006.01); E21C 27/46 (2006.01)
CPC (source: EP)
E01C 23/085 (2013.01); E01C 23/122 (2013.01); E02F 5/326 (2013.01); E21C 27/46 (2013.01)
Designated contracting state (EPC)
CH DE FR GB
DOCDB simple family (publication)
WO 7900563 A1 19790823; DE 2934904 A1 19801211; DE 2962660 D1 19820624; EP 0010105 A1 19800430; EP 0010105 B1 19820505; JP S55500089 A 19800214; JP S6256281 B2 19871125
DOCDB simple family (application)
US 7900042 W 19790129; DE 2934904 A 19790129; DE 2962660 T 19790129; EP 79900211 A 19790828; JP 50041679 A 19790129