INSTRUMENT FOR MEASURING INNER DIAMETERS OF LOW-RIGID HOLLOW ARTICLES Russian patent published in 2006 - IPC G01B5/12 

FIELD: measuring technique.

SUBSTANCE: instrument comprises housing (1) whose central opening receives movable rod (10) with conical surface (11) at its one end, measuring head made of spring-loaded measuring sectors (3) set in guides (4) over the periphery and having wedge-shaped surfaces that cooperate with conical surface (11) of movable rod (10), lever (18) provided with the arms of different lengths which is secured inside housing (1) and whose small arm cooperates with the second end of movable rod (10), and indicator (17) with measuring tip mounted on housing (1). In addition, housing (1) is provided with hollow guiding stand (2) whose end is provided with measuring head. Movable rod (10) is mounted inside hollow guide of stand (2). The bearing with locking mechanism is mounted coaxially to the stand for permitting rotation with respect to it. The bearing is mounted on the outer surface of the hollow guide of the stand or its guiding rod enters the through opening made in the hollow rod and guides of the measuring head. The indicator is mounted on the housing for permitting its measuring tip to be in a contact with large arm of lever (18). The locking mechanism is made of spring-loaded balls and grooves mating to the balls, which are made on the interacting surfaces of the instrument.

EFFECT: expanded functional capabilities.

2 cl, 3 dwg