专利名称：Apparatus for the precision measurement of
internal tube diameter over a long distance
发明人：LE MARER, RENE,GROSSO, PHILIPPE,PERRIN,
GABRIELLE
申请号：EP93401709.6申请日：19930701公开号：EP0577514B1公开日：19960417
摘要：Device intended to be introduced and moved axially in a cylindrical casing (100),of axis D1 and internal diameter (110), in order to measure the said internal diameter(110). According to the invention, the device includes a measurement apparatus (400),and, placed in alignment, a reading head (200) comprising contact elements (310, 320, 330)of spherical shape which can move radially with respect to the said axis D1 and consist ofa magnetic material, a transmitter (210) capable of moving along the said axis D1 withrespect to the said measurement apparatus under the action of an elastic means (500),the said transmitter having a body of substantially conical shape which bears on the saidcontact elements to hold them in contact with the internal wall (101) of the said casing(100), and a rigid holding means (260) with axial polarisation positioned opposite the saidtransmitter, facing the said contact elements, and having a polarised planar bearingsurface (260a) perpendicular to the said axis D1, used as a bearing surface for the saidcontact elements.
申请人：FRANCE TELECOM,FRANCE TELECOM,FRANCE TELECOM
地址：FR
国籍：FR
代理机构：Martin, Jean-Jacques
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