Percussion instrument

Details Percussion instrument Percussion instrument

1983-04-11

1985-02-19

Coven, Edward M.

Surgery

Truss

Pad

128777, 73 82, A61B 500

Patent

active

044999062

ABSTRACT:
A percussion instrument suitable for use in dental practice for determining the degree of looseness of teeth has a movably seated ram which is accelerated to a defined velocity by an electromagnetic drive means and is subsequently moved toward a test subject (such as a tooth) in free flight. The electromagnetic means also controls return of the ram to a rest position. The ram is comprised of a non-magnetic section and a section of low magnetic retentivity passing through a magnetic coil. Control electronics supplies current pulses to the coil. The velocity of the ram is detected by a measuring and evaluation unit and is maintained at a constant value after a comparison of a rated value with the actual velocity value. The current feed to the coil is discontinued when the rated velocity is reached.

REFERENCES:
patent: 3094115 (1963-06-01), Polin
patent: 3498388 (1970-03-01), Jovis
patent: 3653373 (1972-04-01), Batterman
patent: 3782188 (1974-01-01), Koober et al.
patent: 4192321 (1980-03-01), Korber et al.
patent: 4195512 (1980-04-01), Reid

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