Measuring and testing – Vibration – Vibrator
Patent
1982-05-04
1984-04-03
Birmiel, Howard A.
Measuring and testing
Vibration
Vibrator
73665, 403 50, 403223, G01N 2904
Patent
active
044400268
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention has to do with vibration apparatus such as is used in the screening or testing of assembled devices and components thereof, particularly mechanical, electromechanical and electronic devices and components for defects in design or manufacturing. More particularly, the invention is concerned with improvements in vibration apparatus used for screening or testing enabling vibratory shaking of a slip plate without pivoting movement about the shaker axis of engagement with its support block.
BACKGROUND ART
It is known in the art to couple a vibration shaker to a slip plate supported on a support block, typically of polished granite on which there is a thin oil film maintained, and to oscillate the slip plate in one or another predetermined direction by operation of the shaker. The direction of vibratory movement is critically maintained for test validity. The slip plates are limited in their freedom of movement to have a definite response to shaker driving, e.g. by the use of rails, channels, or other guiding devices such as linkages. Such expedients do not permit driving of the slip plate in two axes simultaneously, or only with the need simultaneously to drive through angles and with added mass.
DESCRIPTION OF THE INVENTION
It is therefore an object of the invention to provide apparatus for the vibration screening or testing of assemblies an components, particularly those usefully tested in two axial directions simultaneously. It is another object to provide for use with the usual shaker, slip plate and support block apparatus a novel means of blocking pivoting movement of the slip plate about its center axis, while full permitting linear movement along the predetermined axis or axes of movement. It is a specific object to provide a flexure adapted to constrain aslip plate to which it is connected to move linearly by longitudinal bending of the flexure, while blocking pivoting movement of the slip plate by the torsional stiffness of the flexure.
These and other objects of the invention to become apparent hereinafter, are realized in accordance therewith in vibration apparatus in which a shaker is coupled to a test piece-carrying, single plane universally movable, rigid slip plate and drives the slip plate in axially predetermined sliding engagement with a slip plate support block, by the provision therein of flexure means blocking pivoting movement of the slip plate about its center axis normal to the plane, in slip plate predetermined axial movement permitting relation.
In particular embodiments: the flexure means has a locus of engagement with the slip plate in the plane of slip plate sliding engagement with the support block; the flexure means surrounds the slip plate support block at its locus of engagement with the slip plate; the flexure means locus of engagement with the slip plate is circular; the flexure means is circular in cross-section and axially elongated, the flexure means being fixed to a relatively immovable mass at one end and secured to the slip plate remote to the fixed end, whereby the flexure means bends longitudinally in slip plate predetermined axial movement permitting relation, the flexure means further being torsionally stiff in pivoting slip plate movement blocking relation.
Preferably, the flexure means comprises a longitudinally bendable, torsionally stiff cylinder of synthetic organic plastic, is a hollow cylinder, and the apparatus further includes circularly distributed means connecting the cylinder at one end to the slip plate.
The foregoing and other embodiments of the invention, may further include a vibration shaker and a slip plate.
In a particularly preferred embodiment, the invention contemplates in vibration apparatus in which a shaker is coupled to a test piece-carrying, single plane universally movable, rigid slip plate and drives the slip plate in axially predetermined sliding engagement with a slip plate support block, the provision of a cylindrical flexure blocking pivoting movement of the slip plate about its center axis norma
REFERENCES:
patent: 3318139 (1967-05-01), Crook
patent: 3933033 (1976-01-01), Kimball
patent: 4011749 (1977-03-01), Cappel
patent: 4265123 (1981-05-01), Cappel
patent: 4270390 (1981-06-01), Kimball et al.
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