Measuring and testing – Testing by impact or shock – Specimen impactor detail
Patent
1975-02-26
1976-12-28
Gill, James J.
Measuring and testing
Testing by impact or shock
Specimen impactor detail
G01N 314
Patent
active
039994201
ABSTRACT:
Hammer apparatus is provided for impacting an eyeglass lens to test the frangibility of the lens. A hammer arm is pivotally mounted on a base plate for rotation between a vertical position and a horizontal position. A steel ball is connected to the end of the hammer arm to impact the lens. A weight is positioned precisely on the hammer arm to provide the exact amount of impact force required by FDA regulations. A cylindrical pedestal is mounted to the base plate to support the lens horizontally so that the ball strikes substantially in the center of the lens when the hammer arm falls to the horizontal position. A catch member holds the hammer arm in the vertical position and, upon manual actuation, the catch member releases the hammer arm to fall to impact the lens. A removable metal box encloses the pedestal for catching broken glass. The top of the box includes an aperture for the ball to enter as the arm falls to impact the lens.
REFERENCES:
patent: 2362589 (1944-11-01), Simmons
patent: 2388246 (1945-11-01), Berger
patent: 2396620 (1946-03-01), Taxwood
patent: 2778219 (1957-01-01), Wachter
patent: 3209585 (1965-10-01), Wolstenholme et al.
patent: 3488991 (1970-01-01), Dietert et al.
patent: 3724260 (1973-04-01), Bole
Ciarlante Anthony V.
Gill James J.
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