U.S. patent number 3,571,927 [Application Number 04/739,038] was granted by the patent office on 1971-03-23 for novel safety razor.
Invention is credited to Ray L. Stone.
United States Patent |
3,571,927 |
Stone |
March 23, 1971 |
NOVEL SAFETY RAZOR
Abstract
A light, plastic safety razor except for the metal blade therein
comprising a plastic cover, a guard plate, a metal blade between
said guard plate and said cover, a guard edge juxtaposed below the
blade edge and joined to said guard plate, a nonstretchable
flexible member attached to the bottom surface of the guard plate
and extending therefrom along a first plane which is essentially
perpendicular to the bottom surface, and a handle extending from
said member in a direction lateral of said plane.
Inventors: |
Stone; Ray L. (Croton Falls,
NY) |
Family
ID: |
24970549 |
Appl.
No.: |
04/739,038 |
Filed: |
June 21, 1968 |
Current U.S.
Class: |
30/51; 30/32;
D28/46; 30/526 |
Current CPC
Class: |
B26B
21/06 (20130101) |
Current International
Class: |
B26B
21/06 (20060101); B26B 21/00 (20060101); B26b
021/08 (); B26b 021/14 () |
Field of
Search: |
;30/85,32,51 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Simpson: Othell M.
Claims
I claim:
1. A light, plastic safety razor except for the metal blade therein
comprising a plastic cover, a guard plate, a metal blade between
said guard plate and said cover, a guard edge juxtaposed below the
blade edge and joined to said guard plate, a nonstretchable
flexible elongated member attached to the bottom surface of the
guard plate and extending therefrom along a first plane which is
essentially perpendicular to the bottom surface, and a handle
extending from said member in a direction lateral of said
plane.
2. The safety razor of claim 1 wherein the handle is aligned along
an axis which traverses said plane and is in a second plane which
is essentially perpendicular to said first plane.
3. The safety razor of claim 2 wherein the internal angle formed by
the axis and the first plane which indicates juncture between the
handle and the elongated member is at least 90.degree. and not
greater than about 150.degree..
4. The safety razor of claim 1 wherein the cover possesses a
relatively flat guide edge juxtaposed above the blade edge and
which is aligned relative to the blade edge to minimize tipping
during use of the safety razor wholly onto said cover.
5. The safety razor of claim 1 wherein said elongated member is
flexible and bends in response to pressure applied to the head of
said safety razor, which head is characterized as comprising said
cover, blade and guard plate.
6. The safety razor of claim 1 wherein the handle, the elongated
member and the guard plate is a one-piece, plastic
construction.
7. The safety razor of claim 6 wherein the cover is fitted and held
on a stud extending from the guard plate's top surface and the
metal blade therebetween is held under pressure by said cover and
said guard plate.
8. The safety razor of claim 1 wherein the cover, guard plate and
guard edge thereat, elongated member and handle are made of a
plastic having a 1 percent tensile modulus greater than 10,000, and
the elongated member is relatively thin in a dimension thereof
relative to the thickness of the handle.
9. The safety razor of claim 4 wherein the relatively flat guide
edge is at least 1/8 inch long from top to bottom.
10. The safety razor of claim 8 wherein the flexible elongated
member is thin enough so that it is capable of a deflection of
30.degree. in two directions.
Description
This invention is directed to a novel safety razor constructed
particularly for use on legs and areas of the body containing low
hair density, such as arm, underarms, chest and the like.
Present safety razors advertised for use in shaving a woman's legs
represent simple modifications of safety razors constructed for
shaving a man's face. The modifications include lighter weight, a
slightly longer handle and additional adornments.
However, such construction does not take into account the
differences between shaving a man's face and a woman's leg. A man's
face hair growth is typically dense, whereas leg hair growth is
relatively sparse. In addition, the face contains sharp protrusions
and indentations not possessed by legs. These factors require that
a safety razor constructed for use on a face should have a rigid
handle so that hand pressure can be transferred to the razor blade
giving the user greater control over changes in shaving conditions.
This allows the blade to cut dense and stiff hair stubbles, such as
around the chin and nose. Moreover, the cover over the blade should
be thin, exposing minimum edge surface area adjacent the blade edge
to allow the blade to make contact with hair under the nose and in
indentations, such as at the chin, under and around ears, under the
lip and around the throat. A thin cover also improves vision when
cutting sideburns.
However, these features are undesirable when it comes to shaving a
woman's leg because a stiff handle means that the blade responds
only to hand pressure, when the blade contacts small protruding
blemishes on leg skin, it slices into the blemish and a cut is
created. Moreover, a thin edged cover makes the razor susceptible
to tilting back towards the cover which could expose the blade free
of the guard leading to greater possibilities for skin cutting or
removing the blade edge from contact with the skin. Were the handle
made stretch flexible in the manner described in U.S. Pat. Nos.
1,015,575; 2,053,258 and 2,083,172, then as the head contacts
resistance on the leg, it would be thrown forward on the guard.
This moves the blade from about the skin surface where effective
shaving is effected. A stretchable and flexible soft rubber handle
is extremely limp and therefore constantly throws the head forward
even in the absence of significant resistance, making shaving
uneven and a chore because the same surface must be repeatedly
attacked with the razor to obtain a good shave. This same effect is
had with razors possessing stretch flexible spring handles when the
razor is pulled with the usual long strokes over the relatively
smooth leg skin. The pulling action coupled with the hand pressure
applied induces the head to be repeatedly thrown forward onto the
blade guard.
A common deficiency of all such razors is that the handle is
aligned with the head such that when grasped by a hand and used for
leg shaving with the usual upward stroke, the hand hides visual
inspection of the shaving action of the blade, thus causing
irregular shaving. These handles are aligned along a plane which is
both perpendicular to the bottom surface of the razor head (i.e.,
the bottom surface of the guard plate) and the direction of the
cutting edge of the blades.
Each of the above disadvantages are avoided by the novel safety
razor of this invention which is constructed for smooth shaving of
legs and other parts of the body as described above. The safety
razor of this invention allows complete visual inspection during
shaving. It also contains a floating head that rises and falls in
response to protrusions without nicking and cutting the skin yet
consistently remains about the skin surface for effective
shaving.
The safety razor of this invention is light because all of it but
the blade is made of plastic, such as nylon
(polyhexamethyleneadipanide, poly-epsilon-caprolactam, etc.),
polyethylene, polycarbonate, poly(oxymethylene), block copolymers
of acrylonitrile, styrene and 1,3-butadiene, polyvinylchloride, and
the like.
In addition to its all plastic construction, except for the blade,
the safety razor of this invention comprises a cover with a
relatively flat guide edge juxtaposed above the blade edge, a metal
razor blade thereunder, and a guard plate under the blade with a
guard edge juxtaposed below the blade edge. Attached to the bottom
surface of the guard plate, preferably attached at the center of
the guard plate's bottom surface is a nonstretchable, flexible
elongated member extending from the plate along a first plane which
is essentially perpendicular to the bottom surface and the blade's
edge. The nonstretchable, flexible elongated member desirably has a
length of from about 1/2 inch to 3 inches, preferably from 1/2 inch
to 21/2 inches. Extending from the terminus of the member in a
direction lateral of said plane and an extension of said member is
a handle which is relatively rigid. In the preferred embodiment,
the handle is aligned along an axis which traverses said plane and
it is in a second plane which is essentially perpendicular to said
first plane. Most preferably, the internal angle formed by the axis
and the first plane is at least 90.degree. and not greater than
about 150.degree..
The safety razor of this invention can be characterized by some
distinct features such as an all plastic construction (except the
blade), a relatively flat guide edge above the blade which prevents
tipping of the head, and maintains a positive blade edge exposure
and blade edge angle, a nonstretchable flexible member which joins
the handle to the head so that the head floats without tilting on
the guard edge or cover, and a handle which is disposed at an angle
along a plane which is in a direction essentially parallel to the
blade's cutting edge so that the hand does not hide the head during
shaving. Because the handle is angularly disposed and coupled with
the nonstretchable flexible member, relatively little hand pressure
can be transferred to the head, thereby minimizing nicking of the
skin with the blade.
In the above description, the term "stretchable" means the ability
to stretch and recover at room temperature (25.degree. C.) as does,
e.g., an elastic such as rubber, and the term "nostretchable" means
the inability to stretch.
In order to further illustrate the novel safety razor of this
invention, reference is made to the drawing:
FIG. 1 is a perspective view of a razor blade encompassed by this
invention;
FIG. 2 is a side view of a razor blade encompassed by this
invention;
FIG. 3 is an end view of a razor encompassed by this invention
showing a portion of the guard plate, the flexible member and the
handle; and
FIG. 4 is an end view of the razor depicted in FIG. 2.
With reference to FIGS. 1, 2 and 4, safety razor A consists of
cover 1, guard plate 3, blade 2, flexible member 6 and handle 7.
Cover 1 contains relatively flat guide edges 5. Blade 2 is a
standard safety razor blade which is held in position under
pressure between guard plate 3 and cover 1, and by studs 10 which
are molded parts of guard plate 3. Studs 10 hold cover 1 under
pressure on blade 2 by heating studs 10 above the plastic's melting
point to rivet cover 1 in place. Instead of heat sealing studs 10,
each stud 10 can be provided with peripherally flanged ends over
which are pressed small concave caps having two internally directed
flanges such that the cap's flanges are engaged and locked under
the stud's flange. Alternatively, studs 10 can be threaded and wing
or other types of nuts can be screwed onto each stud to lock down
cover 1. Obviously other methods for holding cover 1 in place
through studs 10 may be employed, such as press fitting the stud in
holes in cover 1 and/or fixing the studs in place with an
adhesive.
Extending from the shaving edge of guard plate 3, as integral parts
thereof, are downwardly curled guards 4. Guards 4 may be smooth
curved surfaces, smooth flat surfaces, multigrooved combing
surfaces or a finely serrated surface. Each guard 4 may have a
differently textured surface.
Flexible member 6 extends from the center of the bottom surface of
guard plate 3. Preferably, member 6 is a molded part of plate 3. In
one embodiment, as depicted in FIGS. 1, 2 and 4, member 6 is thin
enough that it is capable of about 30.degree. movement in either
direction. As shown in FIG. 3, the flexible member 11 contains thin
portions 12 which are flexible segments, while the remainder of
member 11 may be relatively thick.
Handle 7 may be of any thickness or shape so long as it is canted
in a direction sidewards of the blade's cutting edge.
Because of the angular disposition of the handle, it is most
conveniently gripped by the user's fingers, particularly at about
the fingertips. As a result, it is almost impossible for the user
to supply substantial pressure to the razor's head (comprising
cover 1, blade 2 and guard plate 3) and the head gently glides over
the skin. In addition, since handle 7 is so angularly disposed, the
handle is easy to pull while allowing a clear view of the head
during shaving. Moreover, the angular disposition of the handle
allows the user to control the lay of the razor's head on the skin
by simple and slight movements of the grasping fingertips.
The guide edges 5 serve an important function during shaving. The
long pulling stroke typically employed in shaving of legs tends to
throw the head on the cover as a result of changes in the
disposition of the hand during the stroke. However, guide edge 5
prevents the head from rolling onto the top of cover 1 and resists
separation of the blade's cutting edge from its cutting station
over the skin.
In a particularly preferred embodiment, the outermost point of each
guide edge 5 and the outside angle receding therefrom forming edge
5 is essentially rectilinearly aligned with the disposition of the
angle of the adjacent blade cutting edge. In this embodiment, the
blade's cutting tip extends beyond the outermost point of each
guide edges 5 and the close proximity of guide edge 5 and its
closely aligned surface protects the skin from the blade in case
the head is tilted onto the cover during use. In the most preferred
embodiment, the corner edge of the cover closest to each cutting
tip of blade 2 is essentially over the cutting edge while the guard
edges 4 are slightly extending beyond the blades cutting edges or
rectilinearly aligned with the cutting edges. In the case of guard
plate 3, it may be slightly wider than blade 2 while cover 1 is
slightly narrower than the enclosed blade 2, such differences from
the blade width being typically not more than about three
thirty-seconds of an inch, preferably not more than about one
thirty-seconds of an inch.
The advantages of the safety razor of this invention will be
apparent from the following discussion:
During shaving, the razor is typically grasped by handle 7 and
drawn upwards. Because of the angular arrangement of handle 7, it
is most easily grasped by the thumb and two to four fingers. This
precludes exertion of excess pressure on the handle which can be
translated to increased pressure on the skin by the blade. Since
member 6 is made of plastic, desirable possessing a 1 percent
tensile modulus of at least 10,000, it does not distort by
stretching when the hand pulls the razor. Moreover, fingertip
control of handle 7 and the razor allows the user to comfortably
and easily roll the handle with the fingers to keep the head
properly balanced on the skin during shaving. Since cover 1
possesses flat guide edges 5 juxtaposed above the edges of blade 2,
it is difficult to tilt the head off a guide edge 5. This is
particularly the case when edge 5 is at least one-eighth inch long
from top to bottom, preferably at least one-fourth inch long.
Flexible members 6 and 11 allow the head to float when the guard
edge 4 contacts skin protrusions. In the case of member 6, which is
flat, its flexibility is dependent upon its thickness at its
narrowest dimension (as shown in FIGS. 1, 2 and 4). By controlling
such thickness, one can vary the "floating head" action. The same
can be said for member 11, which depends upon the dimensions of
thin portions 12 for variation in flexibility.
Weight control can be effected by making handles 7 and 14 hollow,
i.e., tubular. Cover 1 and plate 3 can be made with perforations or
holes using ribbing to support edges 5 and guards 4. By use of
these variations, the weight of the razor can be minimized to make
it light feeling yet effective is use.
It is significant to note the advantages gained from the use of
relatively stiff plastics, i.e., plastics having a 1 percent
tensile modulus greater than 10,000. Such stiff plastics have great
structural strength, do not readily distort, yet are very flexible
when made thin enough.
The plastic razor of this invention can be made by injection
molding. The guard plate 3, studs 10, member 6 or 11 and handle 7
or 14 can be molded in one die and cover 1 in another die. Blade 2
can be inserted by machine or hand, and cover 1 can be similarly
put in place followed by heat sealing studs 10 to securely lock
blade 2 into place or the other embodiments mentioned above for
holding cover 1 in place.
It should be noted that razor A can be a single edge safety razor.
In this embodiment, plate 3 has only one guard 4 and cover 1 has
only one edge 5.
Though this invention has been described with respect to a
plurality of embodiments thereof, it should not be limited thereby,
nor is it intended to be so limited.
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