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Патент USA US2129378

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Sept. 6, 1938.
2,129,378
D. G. MCPEAKV
l
RAZOR STROPPING MECHANISM
' Filed March 27. 1936
2 sheets-sheer 1
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INVENTOR
ATTORN EY
_Sept 6, 1938.
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D, G, MC|=>EAKV
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2,129,378
RAZOR STROPPING MECHANISM
Filed March 27. 1956
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2 Sheets-Sheet 2
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INVENTOR
ATTORNEY
Patented Sept. 6, 1938
2,129,378
UNITED STATES
PATENT OFFICE l
2,129,378
RAZOR STROPPING MECHANISM
Dorsey G. McPeak, Crivitz, Wis.
Application March 27, 1936, Serial N0. 71,144
4 Claims. (Cl. 51-153)
My invention, relates to improvements in razor `
stropping mechanisms, with particular reference
to that class of mechanisms which are employed
for stropping safety razor blades.
Objects of my invention are to provide an im
proved plate holding carriage and improved
means for guiding the carriage and tensioning it
to facilitate blade reversal preparatory to a re
versal in the direction of carriage movement.
In the drawings:
Figure 1 is a plan view of a razor stropping
mechanism embodying my invention.
Figure 2 is a side elevation of the same.
Figure 3 is a sectional view drawn to line 3-3
of Figure l.
.
Figure 4 is a sectional View drawn to line 4--4
of Figure 2.
Figure 5 is a side elevation of the carriage with
the plate holder in a vertical position midway be
20 tween its two working positions.
Figure 6 is a plan view of the carriage as it ap
pears when detached.
Like parts are identified by the same reference
`characters throughout the several views.
A strop» holder plate Il) formed with a handle
II at one end has its upper side surface provided
with obliquely disposed strips I2 of stropping ma
terial, preferably leather, cemented or otherwise
adhesively secured to the holder plate Il). Par
36 allel to the upper surface of the plate IIJ it is pro~
vided with an elongated guideway l5 which may
be formed by cutting an open ended slot in plate
ID and closing the open end by means of a filler
block I6 after the carriage has been assembled as
35- hereinafter explained. This filler block I6 may
be secured in position by means of screws Il,
whereupon the block will serve as a stop for the
carriage at the. outer end of its stroke.
Above and below the slot or guideway I5 the
40 plate I0 is channeled along one side as indicated
at I8 and I9, to provide a guide or runway for a
tensioning plate 20 associated with the carriage
now to be described.
'I'he carriage comprises side walls 25 and 25
45 connected by cross rods 2l. These cross rods
intermediate of their ends are of a diameter sub
stantially equal to the vertical dimensions of the
slo-t I5 in which they have a sliding fit. They
have end portions of reduced diameter which ex
TST O tend through holes in the carriage wall 25 and are
provided with heads 28,` Their other ends are
similarly reduced to provide neck portions of
greater length, whereby they may be passed
through slots 29 in a rack carrying slide 35 and
554 through holes in the carriage wall 25.
The slots 29 permit an independent movement
of the rack carrying slide 30 without actuating
the carriage, the latter being normally held in
a stationary position by the friction of the ten
sion plate 20 upon the inner walls of the chan
nels or rabbets I8 and I9 under tension imposed
by coiled springs 33 which connect the tension
plate 20 with the wall 25 of the carriage. This
wall 25 also bears frictionally upon the adjacent
edge of the holder plate I0.
10
An operating handle or knob 35 has a shank 36
which extends through a slot 31 in the carriage
wall 26 and through a hole in the slide 3l] to which
it is secured by a screw 38 threaded into the end
of the shank 36, whereby the slide 30 may be 1,5:
manually actuated by means of the knob 35.
The slide 30 is provided with a rack bar 40 hav
ing upwardly projecting teeth 4I in mesh with the
teeth of a pinion 42 carried by an oscillatory shaft
43 to which a razor blade holder is secured, this
holder having convergent side plates 44 and 45
29.
adapted to clampingly engage a razor blade as in
dicated at a in Fig. 5. The plates 44 and 45 are
ñxedly secured at their respective ends to shaft
43 by means of end disks 4l through which re 25
duced end portions of shaft 43 are passed. These
reduced end portions of shaft 43 are journaled in
the upwardly extending side walls 25 and 26 of
the carriage. The portions of the shaft which
pass through the disks 41 may be squared or 30
anchored to the disks 4l in any suitable manner,
and the blade holder members 44 and 45 are
rigidly secured to these disks 41.
In operation the knob 35 is reciprocated to first
move the slide 30 until one end of each slot 29 03 5
engages the associated carriage shaft 2l, where
upon continued motion will be transmitted to the
carriage. The initial movement of slide 30 will be
transmitted through the rack 4I and pinion 42
to adjust the blade in proper stropping position. 40
When the motion is transmitted to the carriage
the blade will be drawn across the stropping
bands I 2, preferably until the advancing carriage
ross rod 2l strikes the end block I6 when mov
ing in one direction, or the inner end of the slot 45
I5 when moving in the other direction.
_
In each instance, upon reversal of the direc
tion of movement, the slides 3i! will be initially
moved along the wall 26 of the carriage until the
cross rods 2l engage the opposite ends of their
associated slots. During this initial movement
of the slide 30 the carriage will be held to the
holder plate I0 by the tension bar 20 which, how
ever, will not develop sufficient friction to prevent
the carriage from being manually moved without
O
2
2,129,378
for sliding movement along the strop holder and
having spaced side walls rigidly connected by
undue exertion after the slide has completed its
independent movement. It will, of course, be
understood that during this independent move
ment the position of the razor blade will have
cross rods in a common plane, blade holding and
reversing mechanism associated with one of the
side walls, and a tension plate adjacent said side
wall and resiliently connected with the opposite
side wall by tension springs located between said
cross rods and substantially in the plane thereof,
whereby said carriage may be operated along the
sides of the rigid strop holder with the cross rods
extending between upper and lower portions of
been reversed by means of the rack and pinion.
I am aware of the fact that stropping mech
anisms have heretofore been constructed with
blade supporting carriages and with rack and
pinion means for reversing the position of the
10 blade.
So far as I am aware, such mechanisms
have not been adapted to reverse and` move the
blade with the desired smoothness and uniformity
of pressure upon the stropping material. It is
the holder to allow the holder to rest upon a
ì
essential to maximum efficiency that the carriage
15 and the slide should be guided in a true lineal
stroke at substantially uniform speed through
out the length of stroke and without varying re
sistance such as occurs if lateral or vertical or
table while the carriage is being reciprocated.
2. In a mechanism of the described class, a
rigid strop holder surfaced with stropping ma
' terial on one side and having a longitudinally
extending slot parallel with the stropping sur
face, said strop holder being channelled along one
margin to form a laterally facing guideway, in
torsional movements are permitted.
combination with a razor blade carriage having
By providing a slide 3B of greater length than
the carriageI and adapted to ñt against the side ' cross rods in sliding ñt relation to said slot, a
margin of the holding plate I0, and by provid
blade reversing slide mounted for limited move
ment along one side of the carriage and provided
ing cross shafts or rods 2l which have a sliding
fit in the‘slot l5 to prevent vertical movement, with a laterally projecting actuating knob, said
25 and by providing the tension bar 26’ which is carriage having a tensioning plate in sliding lit
held by the springs 33 in sliding ñt relation to relation to the guideway, and tension springs
extending through said slot and connecting the
the runners I8 and I9, I obtain the required
smoothness and freedom from vibratory shock tensioning plate with the opposite side wall of
the carriage to resiliently clamp the carriage to
while permitting ease of manipulation by means
of the laterally projecting knob 35. Also, my the sides of the strop holder, said springs being
improved razor strop can be so inexpensively
adapted to impart a greater resistance to the
20
constructed as to make it available to persons of
small means.
I am aware of the fact that attempts have
. 383i
heretofore been made to provide commercially
successful strops, the frames of which have chan
nel bar sides >arranged with the channels facing
inwardly, and serving as guides for a set of
slides subject to resilient outward pressure be
tween the upper and lower flanges of the chan
carriage.
3. The combination with a horizontally slotted
rigid stropping bar having a stropping upper sur
face, of a rigid blade carrier having side plates
connected with each other by spaced cross bolts
extending through the slot in said bar, said bolts
being adapted to also support the carrier from the l e
nel bars. But in such constructions the carriage
bar, a rack carrying slide plate associated with
plates, reversingV mechanism, and the slides must Y
the inner .face of one of the carrier side plates
for independent movement limited by said cross
bolts, a tension plate between the slide plate and
operate between the strop and the channelled
sides of the frame, and neither the strop nor
the strop supports canV serve as guides. Access
45ï» to
the guiding and controlling mechanism is not
possible without taking the frame apart and dis
turbing the alignments. Also, these guiding and
controlling members are invisible during opera
i; tion, and if any of the parts stick, catch or bind,
the cause cannot be ascertained by inspection
during operation, whereas in my improved strop
ping mechanism all of the parts are visible in
operation andthe strop holder can be laid flat
-fupon the table and held rigidly thereon while
55 manipulating the laterally projecting handle
without interference with visibility. Also, both
the upper and the lower walls of the strop holder
plate may be formed of wood and a rigidly sup
60 ported strop applied to the upper surface, and
because of this rigidity, accurate positioning and
alignment of the working parts is easily obtained.
It will be observed that the strips of stropping
material extend >across the holder at approxi
(55
movement of the carriage than that of the blade
adjusting slide in its movement relatively to the
- mately a 45 >degree angle to the line of move
ment of the carriage and blade support. There
fore the blade is> substantially at all times inl
contact with two- of the strips, thereby avoid
ing any tendency toward an axial tilting of
70 the blade due to a lack 'of' support on both sides
of its transverse center line.
I claim'i
1. In a stropping mechanism of the described
class, the combination with a rigid strop holder
76 having a stropping surface of a carriage adapted
said bar and connected with the opposing side i
plate by tension springs extending through the
slot in said bar, Vsaid bar having a longitudinal
guide groove in one margin within which the
tension plate may operate, and a blade holder
supported by the carrier and having a blade
reversing pinion in engagement with the slide
plate rack.
4. The combination with a horizontally slotted
rigid stropping bar having a stropping upper
surface, of a rigid blade carrier having side plates
connected with each other by spaced cross bolts
extending through the slot in said bar, said bolts
being adapted to also support the carrier from
the bar, a rack carrying slide plate associated
with the inner face of one of the carrier side 60
plates for independent movement limited by said
cross bolts, a tension plate between the slide plate
and said bar and connected with the opposing
side plate by tension springs extending through
the slot in said bar, said bar having a longi
tudinal guide groove in one margin within which
the tension plate may operate, and a blade holder
supported by the carrier and having a blade
reversing pinion in engagement with the slide
plate rack, said’slide plate being provided with
a laterally projecting knob and the associated
wall of the carrier being provided with a slot
through which the slide plate is connected with
said knob.
75
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