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Description  |
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BACKGROUND
1. Field of Invention
This invention relates to cutting tools and is particularly directed to
plier-type hand tools and is especially directed to plier-type hand tools
having a razor-type blade mounted on plier-type handles.
2. Prior Art
Razor-type blades have long been used for cutting various materials.
However, by themselves, such blades are difficult to manipulate and
dangerous to handle. Accordingly, numerous types of handles have been
proposed heretofore for mounting such blades. These handles provide
greater control and ease of manipulation in cutting and provide a safer
mechanism for gripping the blades. However, considerable difficulty is
still involved in installing the razor-type blades on the handles and in
removing the blades from the handles. Furthermore, it is often desirable
to combine a razor-type blade with other hand tools, such as pliers, wire
cutters and the like. My prior patent, U.S. Pat. No. 5,185,930 issued Feb.
16, 1993, is an example of such plier-type cutting tools. However,
plier-type tools are usually formed of cast or forged tool steel, which is
extremely expensive and difficult to work. Consequently, the cost of such
plier-type tools is relatively high. Also, plier-type hand tools are
usually designed to perform a specific function and are not convertible to
perform other functions. Thus, for example, conventional pliers cannot be
converted to perform cutting operations. Thus, none of the prior art
razor-type hand tools have been entirely satisfactory.
BRIEF SUMMARY AND OBJECTS OF INVENTION
These disadvantages of prior art hand tools are overcome with the present
invention and an improved plier-type hand tool is provided which is simple
and inexpensive to produce, yet which is readily convertible to perform a
variety of functions and which is capable of safely and conveniently
mounting a razor-type cutting blade or the like.
The advantages of the present invention are preferably attained by
providing an improved plier-type tool having a first member comprising a
pair of components formed of sheet material mounted in fixed spaced
relation, and a second member formed of sheet material and pivotally
mounted between the components of the first member, each of the members
having a jaw portion and a handle portion, and means interchangeably
mountable on the jaw portions of the members for performing a desired
function.
Accordingly, it is an object of the present invention to provide an
improved hand tool.
Another object of the present invention is to provide an improved
plier-type hand tool.
An additional object of the present invention is to provide an improved
plier-type hand tool which is simple and inexpensive to produce.
A further object of the present invention is to provide an improved
plier-type hand tool which is readily convertible to perform a variety of
functions.
Another object of the present invention is to provide an improved
plier-type hand tool which is capable of safely and conveniently mounting
a razor-type cutting blade or the like.
A specific object of the present invention is to provide an improved
plier-type hand tool having a first member comprising a pair of components
formed of sheet material mounted in fixed spaced relation, and a second
member formed of sheet material and pivotally mounted between the
components of the first member, each of the members having a jaw portion
and a handle portion, and means interchangeably mountable on the jaw
portions of the members for performing a desired function.
These and other objects and features of the present invention will be
apparent from the following detailed description, taken with reference to
the figures of the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a side view of a hand tool embodying the present invention;
FIG. 2 is a top view of the hand tool of FIG. 1;
FIG. 3 is a side view of the hand tool of FIG. 1 shown in the open or
blade-changing position;
FIG. 4 is a side view of an alternative form of the hand tool of FIG. 1,
shown in the open position;
FIG. 5 is a side view of a pair of interchangeable insert members for use
with the hand tool of FIG. 4;
FIG. 6 is an end view of the insert members of FIG. 5;
FIG. 7 is a vertical section through another alternative form of the hand
tool of FIG. 1, shown in the closed position;
FIG. 8 is a top view of the hand tool of FIG. 7; and
FIG. 9 is a side view of the hand tool of FIG. 7, shown in the open
position.
DETAILED DESCRIPTION OF THE INVENTION
In that form of the present invention chosen for purposes of illustration
in FIGS. 1-3, a plier-type hand tool, indicated generally at 10, is shown
having a first member 12 and a second member 14 which are pivotally
connected by suitable means, such as rivet 16. As best seen in FIG. 2, the
first member 12 is formed of a pair of side plates 18 and 20 which are
joined by spacer members 22 and 24, so as to allow the second member 14 to
fit between the side plates 18 and 20. The side plates 18 and 20 and
spacer members 22 and 24 may be formed of sheet metal and may be secured
together by welding, adhesive or other suitable means. The forward end 26
of the second member 14 is formed with a recess 28 to receive a razor-type
blade 30, which is releasably retained in the recess 28 by suitable means,
such as pin 32, which passes through a suitable opening 34 in the blade
30. If desired, upper edge 36 of the first member 12 and lower edge 38 of
the second member 14 may be sharpened, as indicated at 40 and 42 in FIG.
3, to form scissor-type blades. Also, if desired, the first member 12 may
be formed with undulations, as seen at 44 to provide a comfortable hand
grip.
In use, the second member 14 is pivoted to its open position, as seen in
FIG. 3, and the razor-type blade 30 is installed by inserting pin 32 of
the second member 14 through opening 34 of the blade 30. The second member
14 is then pivoted to its closed position, as seen in FIGS. 1 and 2, and
the tool 10 is ready for use. By grasping the hand grip 44, the user can
easily, safely and comfortably manipulate the blade 30 to perform a
desired cutting operation. If the blade 30 becomes nicked or dull, the
user simply pivots the second member 14 to the open position, as seen in
FIG. 3, shakes off the old blade 30 and installs a new blade 30 in the
manner described above. If cutting edges are provided, as seen at 40 and
42 of FIG. 3, the user can pivot the second member 14 alternately between
the open position of FIG. 3 and the closed position of FIG. 1 to perform a
cutting operation with the scissor-type blades 40 and 42. When the second
member 14 is in the closed position, as seen in FIG. 1, cutting surface 42
will be located safely between the side plates 18 and 20 and the
razor-type blade will form a shield against inadvertent contact with
cutting surface 40 of the first member. Thus, the only exposed cutting
surface will be the razor-type blade 30 and the tool 10 can be handled
with substantial safety.
FIGS. 4-6 show an alternative form of the tool 10 wherein the cutting
surfaces 40 and 42 are omitted and replaceable inserts 46 and 48 are
provided. As best seen in FIGS. 5 and 6, insert member 46 is formed with a
mounting tab 50 which is insertable between the side plates 18 and 20 and
may be secured by suitable means such as bolts 52 passing through openings
54 of the mounting tab 50 of insert member 46. Insert member 48 has a pair
of mounting tabs 56 and 58 projecting from each side of the insert member
48 to straddle the second member 14 and is secured to the second member 14
by suitable means such as bolts 60 passing through openings 62 of the
mounting tabs 56 and 58 of the insert member 48. The insert members 46 and
48 are preferably formed of tool steel and the working surfaces 64 and 66
may be formed, as desired, to provide a plurality of functions. Thus, as
shown, the working surfaces 64 and 66 of the insert members 46 and 48,
respectively, are shown serrated to enable the insert members 46 and 48 to
serve as gripping jaws, as would be found in a conventional pair of
pliers. Alternatively, if desired, cutting edges could by formed on the
working surfaces 64 and 66 to enable the insert members 46 and 48 to serve
as shear-type cutters. Furthermore, if desired, the first member 12 may be
formed with a recess 66 for receiving a cutter blade insert 68, while the
second member 14 may be formed with a recess 70 to receive a cutter blade
insert 72, as seen in FIG. 4, to enable the tool 10 to serve as a wire
cutter or the like. The cutter blade inserts 68 and 72 are preferably
formed of tool steel and are secured in place by suitable means such as
set screws 74.
In use, the user pivots the second member 14 to the open position, as seen
in FIG. 4, and inserts an article to be gripped or cut between the insert
members 46 and 48. Then by squeezing the second member 14 toward the
closed position, as seen in FIG. 1, the insert members 46 and 48 will be
squeezed against the article and, depending on the type of working
surfaces provided at 64 and 66, the insert members 46 and 48 will either
grip or cut the article.
FIGS. 7-9 show another alternative form, indicated generally at 80, of the
tool 10 of FIG. 1. The tool 80 has a first member 82 formed of side plates
84 and 86 joined by a spacer member 88 and has a second member 90
pivotally mounted between the side plates 84 and 86 by suitable means,
such as rivet 92. Each of the first and second members 82, 90 has a jaw
portion and a handle portion. As seen in FIGS. 7 and 9, the handle portion
91 of the second member 90 is formed to extend above and generally
parallel to the first member 82 to provide a plier-like grip. A third
member 94 is mounted between the side plates 84 and 86 adjacent end 96 of
the tool 80 and is pivotally secured by suitable means, such as rivet 98.
The third member 94 is formed with a recess 100 for receiving a razor-type
blade 30 and has a pin 102 which is insertable through opening 34 of the
blade 30 to releasably retain the blade 30. The third member 94 is formed
with a stud 104 which mates with a recess 106 formed in the forward end
108 of the second member 90.
In use, the tool 80 functions in substantially the same manner as the tool
10 of FIG. 1. However, when the user desires to change the razor-type
blade 30, they simply raise the handle portion 91 of second member 90 to
the open position, as seen in FIG. 9. When this is done, end 108 of the
second member 90 bears against stud 104 of the third member 94 and serves
to can the third member 94 to pivot downwardly, as seen in FIG. 9. This
moves the blade 30 out from between the side plates 84 and 86 and allows
the user to simply shake the blade 30 off of the pin 102 for disposal. A
new blade 30 may then be placed on pin 102 and the third member 94 is
pushed upward to the closed position, as seen in FIG. 7. At the same time,
the handle 91 of second member 90 is moved to the position of FIG. 7,
which returns the tool 80 to readiness for use.
Obviously, numerous other variations and modifications can be made without
departing from the spirit of the present invention. therefore, it should
be clearly understood that the forms of the present invention described
above and shown only and are not intended to limit the scope of the
present invention.
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