U.S. patent number 3,667,122 [Application Number 05/142,792] was granted by the patent office on 1972-06-06 for safety razor blade holder.
This patent grant is currently assigned to Pacific Handy Cutter, Incorporated. Invention is credited to Leonard J. Black.
United States Patent |
3,667,122 |
Black |
June 6, 1972 |
SAFETY RAZOR BLADE HOLDER
Abstract
A safety razor blade holder comprising a longitudinally
extending handle, a threaded stud carried by the handle, a guard
member slidably mounted on the stud, a lock nut for clamping the
guard member and handle together, a safety razor blade, and means
for permitting the guard member to be positioned relative to the
safety razor blade when such blade is in an operative position so
as to expose or temporarily shield the edge of such blade and
preventing movement of the guard member, even when the lock nut is
slightly loosened, from allowing the edge of the blade to be
exposed when such blade is in a second position.
Inventors: |
Black; Leonard J. (Arcadia,
CA) |
Assignee: |
Pacific Handy Cutter,
Incorporated (El Monte, CA)
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Family
ID: |
22501301 |
Appl.
No.: |
05/142,792 |
Filed: |
May 12, 1971 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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815300 |
Apr 11, 1969 |
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Current U.S.
Class: |
30/286;
30/335 |
Current CPC
Class: |
B26B
29/02 (20130101) |
Current International
Class: |
B26B
29/00 (20060101); B26B 29/02 (20060101); B26b
029/02 () |
Field of
Search: |
;30/162,293,332,333,335 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Custer, Jr.; Granville Y.
Assistant Examiner: Peters; J. C.
Parent Case Text
THIS IS A CONTINUATION OF APPLICATION Ser. No. 815,300, filed Apr.
11, 1969, now abandoned.
Claims
I claim:
1. In a safety razor blade holder including a longitudinally
extending handle, a safety razor blade with a backing member, a
guard member, and means for clamping said guard member and handle
together, the provision of:
a transverse channel in said handle having a depth substantially
equal to one-half the thickness of said backing member and being
spaced in the forward edge of said handle a distance so that the
edge of the razor blade is exposed when the backing member is
received therein; and
a transverse channel in said guard member having a depth
substantially equal to one-half the thickness of said backing
member and a width no more than twice the width of said backing
member, said guard member being slidably longitudinally movable
relative to said handle and said razor blade when said clamping
means is loosened so as to expose said blade edge when in the
rearward position, and cover said blade edge when in the forward
position, whereby said razor blade may be positioned with the
backing member in said transverse channel so that the edge may be
partially or fully exposed or shielded.
2. A safety razor blade holder for carrying a safety razor blade
with a backing comprising:
a longitudinally extending handle with a channel having a depth
substantially equal to one-half the thickness of said backing
member and spaced from a forward edge of said handle a distance so
that the edge of said razor blade is exposed when the backing
member is received within the channel;
a guard member having a channel in registry with said backing
member channel having a depth substantially equal to one-half the
thickness of said backing member and a width approximately equal to
twice the width of said backing member, said guard member being
slidably movable relative to said handle and said razor blade
mounted to said handle so as to expose the blade edge when in the
rearward position and cover said blade edge when in the forward
position;
a longitudinally extending recess in said handle and a pin
projecting from said backing member into said recess for limiting
the forward and rearward movement of said guard member relative to
said handle; and
means to selectively prevent sliding of the guard member relative
to the handle and the razor blade mounted therein whereby the edge
of the razor blade may selectively be exposed or protected.
3. A safety razor blade holder comprising:
a longitudinally extending handle carrying a threaded stud;
a guard member having both length and width substantially equal to
the width of said handle and an opening for receiving said
stud;
means engaging said stud for clamping said guard member and said
handle together;
a safety razor blade having a backing member;
said guard member having a laterally extending channel, said
channel having a width greater than the width of said backing
member;
said handle having a longitudinally extending channel and a
laterally extending channel, said channels having a width
substantially equal to the width of said backing member, said
longitudinally extending channel being spaced a distance from the
side edge of said handle so that when said safety blade is received
therein the edge thereof is spaced inwardly from the side edge,
said laterally extending channel being spaced a distance from the
forward edge of said handle so that when said safety blade is
received therein the edge thereof extends beyond the forward edge;
and
means carried by said guard member for releasably engaging said
safety razor blade so that rotation of said guard member effects
rotation of said safety razor blade from the exposed to the
retracted position.
4. The safety razor blade holder of claim 3 wherein said guard
member opening is elongated for permitting slidable movement
thereof relative to said handle.
5. The safety razor blade holder of claim 1 wherein said guard
member includes a pin disposed in one corner and projection from
the inner face thereof and said handle includes an elongated recess
for receiving said pin when said guard member is oriented for
slidable longitudinal movement relative to said handle and a
circular recess for receiving said pin when said guard member is
oriented 90 degrees to said first mentioned orientation.
6. The safety razor blade holder of claim 1 wherein said means
carried by said guard member for engaging said razor blade
comprises at least one magnet.
7. In a safety razor blade holder including a longitudinally
extending handle, a safety razor blade including a backing member,
a guard member, and means for clamping said guard member and handle
together, the provision of:
a transverse channel in said handle having a depth substantially
equal to one-half the thickness of said backing member and spaced
from the longitudinal edge of said handle a distance so that the
edge of the razor blade is not exposed when received therein;
said guard member having a transverse channel having a depth
substantially equal to one-half the thickness of said backing
member and a width substantially equal to twice the width of said
backing member;
said guard member being slidably longitudinally movable relative to
said handle and to said razor blade when said means for clamping is
loosened so as to expose said blade edge when in the rearward
position and cover said edge when in the forward position;
means preventing slidable movement of said guard member relative to
said handle in a direction normal to the longitudinal axis of said
handle and permitting slidable movement of said guard member in a
direction parallel to the longitudinal axis of said handle when
said means for clamping is slightly loosened, said means comprising
a pin projecting from the corner of the mating surface of said
guard member and an elongated recess in said handle, parallel to
the longitudinal axis of said handle, for receiving said pin when
said guard member's position with its transverse channel normal to
the longitudinal axis of said handle, and a circular recess in said
handle for receiving said pin when said guard member is positioned
with its transverse channel parallel to the longitudinal axis of
said handle,
whereby said razor blade may be positioned with the backing member
in said transverse channel so that the edge may be exposed or
temporarily protected and may be positioned in said longitudinal
channel so that the edge is firmly protected.
8. The provision of claim 7 wherein said guard member additionally
comprises mganetic means for holding said safety razor blade.
9. The provision of claim 8 wherein said means for clamping said
guard member and said handle together comprises a threaded stud
carried by said handle and a lock nut threadedly received thereon.
Description
The prior art is replete with devices used for scraping, cutting or
the like and employing an ordinary safety razor blade, usually of
the single edge type. It will be readily apparent that such a tool
may be exceedingly dangerous because of the sharpness of the
ordinary razor blade edge. The primary problem is to provide for
quick and convenient blade edge exposure when the holder is in use
but the provision of means for securely and reliably shielding the
razor blade edge when the holder is not in use. In many such prior
art devices, there is used a holder comprising two pieces, one of
which is clamped with respect to the other in various positions
through a threaded stud or screw and a complementary locking
nut.
The difficulty with these last-mentioned devices of the prior art,
is that slight unloosening of the lock nut when the holder is not
in use will allow one of the holder pieces to move relative to the
other, or allow the blade to move relative to the two holder
pieces, so that the edge of the razor blade is exposed. When such a
device is not in use and is being carried in a person's pocket or
is carelessly left lying around, this inadvertent blade exposure
can cause severe injury. On the other hand, prior art devices which
have attempted to solve the above-discussed problem, have employed
safety means which have been cumbersome, time consuming, and
otherwise inconvenient to move the blade from the operative to the
shielded position.
Accordingly, it is a principal object of the present invention to
provide a safety razor blade holder wherein a safety razor blade
may be exposed for use and temporarily shielded by suitable
positioning of two holder pieces clamped together by threaded means
and wherein the safety razor blade may be moved to a second
position which more reliably assures the nonexposure of the blade
edge.
It is another object of the present invention to provide a safety
razor blade holder of the above-described type wherein the threaded
means comprises a stud or screw and lock nut which are used to
clamp the two holder pieces together and wherein the blade may not
be inadvertently exposed through accidental unloosening of the stud
and lock nut.
Yet another object of the present invention is to provide a safety
razor blade holder of the above-described type wherein means are
provided to facilitate repositioning of the blade and shield or
guard member relative to the handle so as to move the blade from a
first position to a second position wherein the edge of the blade
cannot be inadvertently exposed.
Still another object of the present invention is to provide a
safety razor blade holder wherein a safety razor blade edge may be
exposed for use in a first position of a guard member and shielded
when the guard member is in a second position, the blade being held
so that the edge thereof remains perpendicular to the longitudinal
axis of the holder.
One more object of the present invention is to provide a safety
razor blade holder which is constructed of metal and is easy and
inexpensive to manufacture, reliable in operation, and has a long
useful life.
Generally, the present invention relates to a safety razor blade
holder comprising a longitudinally extending handle carrying a
threaded stud, a guard member having an opening for receiving the
stud, a lock nut adapted to threadedly engage the stud for clamping
the guard member and handle together, a safety razor blade having a
backing member, and wherein the guard member has a laterally
extending channel with a width greater than the width of the
backing member on the safety razor blade, the handle has a
longitudinally extending channel and a laterally extending channel,
each of which has a width substantially equal to the width of the
backing member of the blade, the longitudinally extending channel
being spaced from the side edge of the handle so that when the
safety blade is received therein the edge is spaced inwardly from
the side edge of the handle and is thereby unexposed, and wherein
the laterally extending channel is spaced from the forward edge of
the handle so that when the safety blade is received therein the
edge thereof extends beyond the forward edge of the handle, and
means for preventing slidable movement of the guard member relative
to the handle in a direction normal to the longitudinal axis of the
handle but permitting slidable movement in a direction parallel to
the longitudinal axis of the handle when the lock nut is slightly
unloosened.
Other objects and many of the attendant advantages of this
invention will be readily appreciated as the same become better
understood by reference to the following detailed description when
considered in connection with the accompanying drawing.
In the drawing:
FIG. 1 is a top plan view of an exemplary embodiment of a safety
razor blade holder constructed in accordance with the present
invention, with the razor blade shown in exposed condition;
FIG. 2 is a partial top plan view of the holder of FIG. 1 with the
blade shown in the temporary shielded position;
FIG. 3 is a view as in FIGS. 1 and 2 with the blade shown in the
reliably unexposed condition;
FIG. 4 is a sectional view taken along the plane IV--IV of FIG.
1;
FIG. 5 is a sectional view taken along the plane V--V of FIG. 1;
and
FIG. 6 is a partial exploded perspective view of the exemplary
embodiment of the safety razor blade holder shown in FIG. 1.
In the drawing, there is shown an exemplary embodiment of a safety
razor blade holder which comprises a handle, indicated generally at
20; means 25 for clamping the handle 20 together with a guard
member indicated generally by the reference numeral 30; a safety
razor blade, indicated generally at 35; means 50 selectively
preventing slidable movement of the guard member relative to the
handle; and means 60 for holding the blade on the guard member.
The handle 20 in the exemplary embodiment of the safety razor blade
holder is a longitudinally extending, preferably metal, planar
member having a rounded rearward edge and a hole 21 for convenient
hanging in such rearward edge. The handle 20 has a forward edge 22
perpendicular to the longitudinally extending side edges 23,
24.
The safety razor blade holder also includes means 25 for clamping
the guard member 30 and handle 20 together. In the exemplary
embodiment, such means comprises the threaded stud 26 carried
adjacent the forward end of handle 20 and disposed off center from
the longitudinal axis of the handle. A lock nut, in the form of
wing nut 27, is threadedly received on stud 26 and may be manually
threadedly engaged thereon so as to clamp guard member 30 to handle
20. It will of course be understood that various types of clamping
means, such as various over-center clamps, and various other
devices, may be used as a substitute for the stud and lock nut as
illustrated in the exemplary embodiment.
The guard member, indicated generally by the reference numeral 30,
comprises a square plate 31 having a width and length substantially
equal to the width of handle 20. Thus, regardless of the position
of plate 31 with respect to handle 20, opposing side edges of the
guard member will be even with the side edges 23, 24 of handle 20.
Forward edge 32 of plate 31 is beveled or rounded to eliminate any
sharp edges from the holder. The rearward portion of plate 31 is
provided with a depression 33 for receiving the thumb of the manual
operator of the holder to facilitate repositioning of the guard
member 30 relative to handle 20.
The holder in the exemplary embodiment also includes safety razor
blade 35 of a construction well known in the art and comprising a
blade portion 36 and a backing member 37. Backing member 37
includes a rectangular strip of metal folded around and secured to
one edge of the blade in a manner well known in the art.
Guard member 30 and handle 20 are provided with blade receiving
channels for positioning the blade in its various operative and
inoperative orientations. Handle 20 is provided with an elongated
transverse channel 40 extending entirely across the width of handle
20. Channel 40 had a depth substantially equal to one half the
thickness of the backing member 37 of razor blade 35, and a width
which is substantially equal to the width of backing member 37. The
channel is spaced forwardly of the stud 26 and is spaced away from
the forward edge 22 of handle 20 a distance so that the edge of the
razor blade 35 is exposed when the backing member 37 is received in
the channel.
Handle 20 also is provided with a longitudinally extending
elongated channel 41 having a length at least equal to the length
of backing member 37 of razor blade 35 and having a depth
substantially equal to one half the thickness of backing member 37.
Like transverse channel 40, longitudinally extending channel 41 has
a width approximately equal to the backing member 37 of the blade.
Such channel 41 is off center on the opposite side of threaded stud
26. The longitudinally extending channel 41 is spaced from the
longitudinal side edge of handle 20 a distance so that the edge of
razor blade is not exposed when the backing member 37 of the safety
razor blade 35 is received in such channel 41.
The guard member 30 also has a transverse channel 42 having a
length which extends entirely across the width of the guard member,
a depth equal to substantially one-half the thickness of the
backing member 37, and a width which is substantially twice as
large as the width of backing member 37.
The greater width of the transverse channel 42 permits the guard
member 30 to be moved relative the razor blade 35 between the
positions shown in FIGS. 1 and 5 and the position shown in FIG. 2,
although the upper half of the backing member 37 of the razor blade
35 extends into the guard member 30. This construction assures that
the exposed edge of the blade will remain perpendicular to the
handle 20 during use.
Guard member 30 also has an opening 45 through which stud 26 passes
which in the exemplary embodiment is elongated in the direction
perpendicular to the transverse channel 42. In this manner, it will
be seen that the guard member 30 may be slidably moved with respect
to handle 20 by virtue of the elongated opening.
The safety razor blade holder of the present invention is also
provided with means 50 preventing slidable movement of the guard
member relative to the handle when the guard member is in a first
position and permitting slidable movement of the guard member with
respect to the handle when in the second position. In this manner,
not withstanding loosening of the clamping means, when the safety
razor blade is positioned in the longitudinal channel 41 of the
handle 20 such that the edge thereof is not exposed, this second
position wherein the blade edge is shielded will prevent
disengagement of the guard member and handle which would allow the
blade to slip out. On the other hand, when the guard member is in
the first position wherein the blade is positioned in the
transverse channel 40 of handle 20, the guard member is permitted
to move longitudinally when the clamping means is unloosened. In
the exemplary embodiment of the present invention, such means 50
comprises a pin 51 located in one corner of the guard member 30 and
projecting or depending downwardly from the mating face of the
guard member. Such means further comprises an elongated recess 52
for receiving pin 51, located near the longitudinal side edge 24 of
handle 20. Recess 52 is elongated in the direction parallel to the
longitudinal channel 41 in handle 20. Such means further comprises
a circular recess 53 for receiving pin 51 located adjacent the
other longitudinal edge 23 of handle 20.
Finally, the exemplary embodiment of the safety razor blade holder
of the present invention includes means 60 for holding, engaging,
or supporting the blade 35 to the guard member 30. In the exemplary
embodiment of this invention, such means is magnetic and comprises
a pair of magnetic buttons 61, 62 mounted in guard member 30 and
positioned so as to overlie the transverse channel 42 whereby the
magnetic buttons may engage the backing member 37 of safety razor
blade 35.
In operation, the holder is shown ready for use in FIG. 1 wherein
the forward edge of blade portion 36 is exposed and is generally
normal to the longitudinal axis of handle 20 as desired for a
scraping operation. In FIG. 2, guard member 30 had been
repositioned with respect to handle 20 by sliding the guard member
forwardly so that the forward edge thereof shields or covers the
forward edge of blade portion 36 of the safety razor blade. The
lock nut 27 may be tightened so as to clamp guard member 30 to
handle 20 thereby preventing the blade from being inadvertently
exposed. However, it will be seen that if wing nut 27 becomes
slightly unloosened, guard member 30 may easily slide backward
thereby exposing the sharp edge of the blade. However, where the
holder is being used frequently, where ready access to the exposed
blade is desired, this temporary shielded position, while not
completely reliable for safety purposes, will be sufficient. It
should be noted that the guard member 30 may slide relative to
handle 20 by virtue of the elongated opening therein and the fact
that the width of the transverse channel 42 allows the guard member
to receive the upper side of the backing member in more than one
position.
Also, it will be noted that the elongated recess 52 receiving pin
51 being aligned with the longitudinal axis of the handle, allows
the pin to slide forwardly and rearwardly in such recess.
On the other hand, where it is desired that the safety razor blade
be firmly, reliably, and securely positioned so that the edge
thereof may not be exposed, the guard member and blade are moved to
the second position. Such movement is facilitated by the magnetic
buttons 61, 62 whereby upon loosening of wing nut 27 guard member
30 may be raised on stud 26 away from handle 20 and the blade 35
will be held through the magnetic button. Thus, when the guard
member is rotated 90 degrees, the blade rotates therewith, and the
guard member may then be rejoined to the handle 20 wherein the
backing member 37 of the blade 35 will be received in the
longitudinally extending channel 41 of handle 20. In this position,
as seen in FIG. 3, the edge of the safety razor blade 35 is not
exposed. Moreover, the guard member 30 overlies this unexposed edge
of the blade and when the clamping means is tightened, the blade is
prevented from extending over the edge of the handle. It should
also be seen that when the lock nut becomes slightly unloosened,
the guard member may not move laterally and will not disengage the
handle whereby the blade could be exposed since the pin 51 on guard
member 30 will remain inserted in circular recess 53 thereby
assuring that the blade will not be exposed.
It will now be seen that all of the above-mentioned objects are
accomplished by the invention and the preferred embodiment
described and illustrated herein. Other modifications and
variations of the present invention are possible in light of the
above teachings and it is therefore to be understood that within
the scope of the appended claims, the invention may be practiced
otherwise than as specifically described.
* * * * *