Patent ID: 7312864

Claim:
Device for determining the straightness of hollow cylindrical surfaces and partial surfaces thereof, and the three-dimensional orientation of several hollow cylindrical surfaces or partial surfaces with reference to at least one of axial parallel offset and angular offset relative to one another, comprising: a transmitting/receiving device having at least one transmitter for emitting light beams and at least one receiver for receiving and for measuring an incidence position of the light beams, the transmitting/receiving device being fixed within a housing which is tangentially swingable essentially without play over a hollow cylindrical surface or partial hollow cylindrical surface, the housing being equipped with an attachment device or rolling device; a reflector/receiving device having at least one partially-reflective optical element for partial reflection of light beams and a second at least one receiver for receiving and for measuring an incidence position of a portion of the light beams, the reflector/receiving device being fixed within a housing which is swingable essentially without play over a hollow cylindrical surface or partial hollow cylindrical surface the housing of the reflector/receiving device being equipped with an attachment device or rolling device.