Severing by tearing or breaking – Methods – With preliminary weakening
Patent
1978-07-31
1979-11-27
Yost, Frank T.
Severing by tearing or breaking
Methods
With preliminary weakening
83886, 225 965, 225103, C03B 3302
Patent
active
041756843
ABSTRACT:
An apparatus having utility in microtomy comprising a device for placing a score line on the top surface of a piece of glass plate, and subsequently breaking that glass along a curvilinear plane which encompasses the score line--to produce a Ralph-type knife. The scoring device includes an arm which is movable along an excursion path in a plane which is parallel to the top surface of the glass. A cam-like adjustment is provided to insure that the arm can travel parallel to the glass's top surface. An ancillary device comprises a pair of spaced clamps which are on either side of a rigid fulcrum, such as a piece of drill rod. An index mark (which is preferably movable) is positioned parallel to the fulcrum, and the glass is manually positioned so that the score line is directly over the index mark. Thumbscrews are provided in the top of each clamp to apply sufficient pressure to the glass so as to cause it to fracture in a controlled manner, thereby producing a Ralph-type microtome knife--which may have a cutting length on the order of 2.5 cm long. Preferably, the glass-scoring device and the glass-breaking device share a common base, so as to contribute to a compact, lightweight, and convenient apparatus.
REFERENCES:
patent: 3175745 (1965-03-01), Insolio
patent: 3371833 (1968-03-01), Sutton
patent: 3908878 (1975-09-01), Blum
patent: 4026262 (1977-05-01), Yasuga
McHugh Charles W.
Yost Frank T.
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