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Republic of Czechoslovakia
Office For Patents And Inventions
Published August, 199
Patent File !u"ber 91#$%
The right to use this invention is the property of the State
according to Section 3, Paragraph G, Number 34/19!
"are# $rba#, Prague
%ethod of %aintaining &a'or (#ades and the Shape of Straight
&a'ors)
Submitted 4 November, 1949*P+39949-
Patent va#id from 1 .pri#, 19+
The invention re#ates to the method of maintaining of ra'or
b#ades and straight ra'ors sharp ithout the au0i#iary
source of energy) To sharpen the b#ades, therefore no
mechanica#, therma#, chemica# or e#ectrica# *rom an artificia#
source- means are being used) There are various mechanica#
sharpening devices being used ti## no to sharpen usedra'or b#ades)
The b#ade is sharpened by crude app#ication of sharpening materia#,
hich a#ays resu#ts in certain
ne ear of the b#ade during the sharpening process) urthermore,
it is 2non that the inf#uence of an artificia#
magnetic fie#d improves the sharpening of ra'or b#ades and
straight ra'ors, if their b#ades #ay in the direction of
magnetic #ines)
.ccording to this invention, the b#ade is p#aced in earths
magnetic fie#d under a ho##o pyramid made of die#ectricmateria#
such as hard paper, paraffin paper, hard cardboard, or some
p#astic) The pyramid has an opening in its basethrough hich the
b#ade is inserted) This opening can be suare, circu#ar, or ova#)
The most suitab#e pyramid is a
four sided one ith a suare base, here one side is convenient#y
eua# to the height of the pyramid, mu#tip#ied by π/+) 5pi or
3)14/+6 or e0amp#e, for the height of 178%, the side of 1)!
centimeters is chosen) The ra'or b#ade of
straight ra'or is p#aced on the support made a#so of die#ectric
materia#, same as the pyramid, or other such as cor2,ood, or
ceramics, paraffin, paper, et) cetra) ts height is chosen beteen 1/
and 1/3 of the height of the pyramid,
this support rests a#so on a p#ane made of die#ectric materia#)
The si'e of this support shou#d be chosen as to #eave
the sharp edges free) ts height cou#d vary from the #imits
stated above) .#though it is not abso#ute necessary, it is
recommended that the b#ade be p#aced on the support ith its
sharp edges facing est or east respective#y, #eavingits side edges
as e## as its #ongitudina# a0is oriented in North South direction)
n other ords to increase the
effectiveness of the device it is recommended #ie in essence in
the direction of the magnetic #ines of the hori'onta#
component of the earths magnetism) This position improves the
performance of the device, it is not hoeveressentia# for the
app#ication of the princip#e of this invention) .fter the b#ade is
proper#y p#aced it is covered ith the
pyramid in such a ay that its side a##s face north, south,
east, and est, hi#e its edges point in northest, south
est, southeast, and northeast direction)
t is beneficia# to #eave a ne b#ade in the pyramid one to to
ee2s before using it) t is essentia# to p#ace it there
immediate#y after the first shave, and not the o#d, du## one)
(ut it is possib#e to use an o#d one, if it is proper#y
resharpened) The b#ade p#aced using the method above is #eft
unobstructed unti# the ne0t shave) The est edge
shou#d a#ays face est) t improves the sharpening effect)
:0amp#e;
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ra'or b#ades, hich is 111 shaves per b#ade
on the average) The brand used as ?$u2at @#ato? made in
8'echos#ova2ia) The #oest count as 1, the highest
as +77) t is considered very easy to achieve up to 7 shaves on
the average) *for a medium hard hair-
The fo##oing shos ho the invention cou#d save both va#uab#e
materia# and money; Ane ra'or b#ade mentioned
above eighs 7)1 grams) ra'or b#ades or 33)1 grams of
stee# per person)
An#y the pyramid shape has been used for this invention, but
this invention is not #imited to this shape, as it can
cover other geometric shapes made of die#ectric materia# that as
used in accordance ith the invention) .nd that
this shape a#so causes regeneration of sharp edges of shaving
b#ades by #oering of stresses and reducing the
number of defects in the grids of crysta# units, in other ords
recovering and reneing the mechanica# and physica# properties
of the b#ade)
&he 'u""ar( Of &he Patent
1) The method of maintaining the ra'or b#ades and straight ra'or
b#ades sharp by p#acing them in the magnetic fie#din such a ay that
the sharp edge #ies in the direction of the magnetic #ines) The
b#ades are p#aced in the earths
magnetic fie#d and are covered by the ho##o pyramid made of
die#ectric materia# such as hard paper, impregnatedor paraffin
paper, cardboard or p#astic) The most suitab#e is a pyramid ith a
suare base) t is the best hen one
side is eua# the height of the cone mu#tip#ied by π /+) 5Pi
or 3)14 /+6 The pyramid is provided is provided ithsuare, round, or
rectangu#ar opening in its base and is oriented ith its side edges
pointing to the northest, southest, southeast, and northeast
directions) The ra'or b#ade or straight ra'or is p#aced
hori'onta##y on the support
made a#so of die#ectric materia#, same as the pyramid or other
such as cor2, ood, paraffin paper, or ceramics, the
height being height being beteen 1/+ and 1/3 of the height of
the pyramid and hich in turn rests on the p#ane
made of die#ectric materia#) The b#ade is positioned in
northsouth direction)
+) %ethod as artic#e 1 and identified by the b#ade is p#aced in
the cone, same side facing the same direction after
each use)
!otes on the )reat P(ra"id Of Cheops*
Given; BeightC14>)> meters
(aseC+37)4 meters
D (aseC11)+ meters
1- ?))))a four sided one ith a suare base here one side is
convenient#y eua# to the height of the pyramidmu#tip#ied by
π /+?*i)e)E pi or 3)1!/+- The side of the pyramid is seen as
the base #ength in architectura# terms π *pi-is given as ++/!,
as the ancients measured it) +37)4 meters C 14>)> 0
π /+) *pi divided by to-
+- The suare root of the Go#den Section of the ancients
*e0pressed as 19>/1+1- is eua# to ithin three percent of
error to the height divided by one ha#f the base #ength of the
Great Pyramid Af 8heops)
a- BC 14>)> meters/)*(-511)+ meters6 C 1)+!+ meters
note: BC Beight, (C (ase
