Severing by tearing or breaking – Methods – With preliminary weakening
Patent
1979-03-05
1980-11-04
Yost, Frank T.
Severing by tearing or breaking
Methods
With preliminary weakening
225 965, 225103, C03B 3302
Patent
active
042315034
ABSTRACT:
A glass-breaking apparatus adapted for breaking microtome knives of the Ralph type, including a generally horizontal base having right and left upright posts which serve in the manner of vices or clamps. A rigid fulcrum in the form of a hardened and elongated member is fixed to the base at a central position between the two upright structures. A movable block is positioned at a desired location between the two upright posts in such a way that the block may affect the precise placement of a piece of glass in the apparatus--by virtue of pushing the glass rearwardly against the block. Index lines are provided on the vertical front face of the block, for use in manually aligning a score line on the top of the glass piece with a desired one of the index lines. The fulcrum is preferably removable and replaceable at will with a similar fulcrum of the same or a different length. Ideally, the fulcrum is selected so as to be significantly shorter than the width of the glass piece, so that there will be a minimum overhang of 1/8 of the glass width on each end of the fulcrum. When sufficient strain is thereafter imparted to the glass piece, it will fracture--beginning at the score line and traveling downward along a cleavage plane toward the fixed fulcrum. The intersection of the cleavage plane with the bottom surface of the glass produces a very sharp cutting edge.
REFERENCES:
patent: 222080 (1879-11-01), Sanborn
patent: 663645 (1900-12-01), Strait
patent: 954773 (1910-04-01), Armstrong
patent: 2354323 (1944-07-01), Layton
patent: 2460205 (1949-01-01), Webster
patent: 3371833 (1968-03-01), Sutton
patent: 3494521 (1970-02-01), Hellstrom
patent: 3908878 (1975-09-01), Blum
patent: 4026262 (1977-05-01), Yasuga
patent: 4175684 (1979-11-01), Butler
McHugh Charles W.
Yost Frank T.
LandOfFree
Microtomy knife breaker does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microtomy knife breaker, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microtomy knife breaker will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1640772