| 摘要 |
PURPOSE:To reduce the weight of respective parts and minimize the number of them and to facilitate and speed up assembling and adjusting operations by installing an internal mechanism which has a pointer on the inside surface of the standstill part of a Bourdon tube. CONSTITUTION:Measured pressure is transmitted to the Bourdon tube through a pressure lead-in passage 11c and a connecting pipe 12a, and a cap 12b at its free end is displaced slightly in proportion to the measured pressure; and this displacement is transmitted to a sector 17 through a bent part 13b atop a coupler 13 and expanded according to the gear ratio to a pinion 16 engaging it to drive the pointer, so that the pressure value is read on a scale plate. In this case, the displacement of an internal mechanism frame 14 is a little because it is installed at the fixed end of the Bourdon tube. Therefore, this displacement causes no functional trouble and the displacement which drives the pointer is the relative mechanical displacement between the tube tip and internal mechanism frame 14, so that there is little influence upon the performance and accuracy.
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