U.S. patent number 3,787,968 [Application Number 05/289,439] was granted by the patent office on 1974-01-29 for segment cutter.
This patent grant is currently assigned to Minnesota Mining and Manufacturing Company. Invention is credited to David Littmann.
United States Patent |
3,787,968 |
Littmann |
January 29, 1974 |
**Please see images for:
( Certificate of Correction ) ** |
SEGMENT CUTTER
Abstract
A segment cutter is formed suitable for cutting segments from a
paper tape, such as encephalogram or electrocardiogram charts,
which is of a compact and low-profile design. The segment cutter
comprises a base member having disposed thereon one or more raised
planar surfaces, a platen having an opening or openings
corresponding to said planar surface and adapted to receive a
length of material from which a portion is to be cut. The platen
overlays the raised planar surface retaining the desired portion of
the material to be cut and forming a track. A tool having a hard
rotating spherical ball adapted to ride in the track is moved
around the track the ball exerting pressure against the upper edge
of the raised planar surface to effect cutting of the desired
portion.
Inventors: |
Littmann; David (Needham
Township, Norfolk County, MA) |
Assignee: |
Minnesota Mining and Manufacturing
Company (St. Paul, MN)
|
Family
ID: |
23111541 |
Appl.
No.: |
05/289,439 |
Filed: |
September 15, 1972 |
Current U.S.
Class: |
30/124; 83/510;
83/454; 83/565; 30/292 |
Current CPC
Class: |
B26F
1/3853 (20130101); B26F 1/3846 (20130101); B26D
1/025 (20130101); Y10T 83/793 (20150401); Y10T
83/75 (20150401); Y10T 83/875 (20150401) |
Current International
Class: |
B26F
1/38 (20060101); B26D 1/01 (20060101); B26D
1/02 (20060101); B26d 007/02 () |
Field of
Search: |
;30/124,286,289,290,292
;83/454,455,456,529 ;24/248R,248B,248C |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Simpson; Othell M.
Assistant Examiner: Peters; J. C.
Attorney, Agent or Firm: Kinney, Alexander, Sell, Steldt
& Delahunt
Claims
What is claimed is:
1. A segment cutter comprising a base member having disposed
thereon at least one raised planar surface having a peripheral
cutting edge, a platen having an opening corresponding in shape to
said planar surface and adapted to receive a length of material
from which a segment is to be cut, said platen overlaying said
planar surface and retaining the desired portion of the material,
said platen and at least a portion of said peripheral cutting edge
of said planar surface forming a track in which a tool having a
hard, rotating, spherical ball is adapted to ride for exerting
pressure against the outer edge of said raised planar surface to
effect cutting of a segment from said length of material.
2. A segment cutter of claim 1 where said raised planar surface is
a removable raised planar surface.
3. A segment cutter of claim 1 where said platen is pivotably
hinged to said base member.
Description
BACKGROUND OF THE INVENTION
In one aspect, this invention relates to a cutter for cutting
segments from paper. In yet another aspect, this invention relates
to the medical field where it is desired to cut uniform segments
from paper, charts, or records.
In the medical field it is generally desirable to cut and retain
certain portions of paper, charts, or records such as those
normally found in electrocardiogram and encephalogram recordings.
Generally speaking, the average record or chart involves a strip or
chart of paper several feet in length; however, only certain small
representative segments of the chart are normally saved for
permanent records. The particular segments chosen for permanent
records are removed from the entire strip and mounted on a backing
sheet which provides a permanent record for the short length of
chart segment cut from the longer paper chart. The backing sheet
used for mounting the cut segments is often of a standard format to
facilitate accurate record keeping and storage and therfore it is
desirable to provide a segment cutter which cuts a uniformly sized
specimen.
Generally the desired segments have been cut from the paper web by
the use of scissors or the like. In some cases, such as large
clinics or hospitals a lever-type die-cutting machine has been
employed. The use of scissors is time consuming and results in
segments of varying size and shape while the use of the lever-type
die cutting machine results in uniform size segments which are
easily cut. However, the die cutting machines are quite large,
expensive and adapted for cutting numerous segments simultaneously
making them undesirable for small offices where space is at a
premium and the number of samples cut does not justify an expensive
cutter. The prior art also discloses the use of a die-cutting
member and roller which effects a perforated cut in the chart. The
perforated cut results in a segment which is still attached to the
test chart and which has to be removed from the test sample by
additional means in order to provide a specimen suitable for
mounting.
The segment cutter of this invention overcomes the shortcomings of
the prior art die cutters and it provides a compact, lightweight
segment cutter which can be easily used in a small area and
conveniently stored when not in use. The cutter of this invention
cuts uniformly shaped segments from the record chart suitable for
mounting on the permanent record sheets presently in use. The
cutting member is removable so that it may be replaced when worn,
and the segment cutter can be formed with different-sized members
allowing smaller segments to be cut from the chart or paper when so
desired.
SUMMARY OF THE INVENTION
Briefly, the segment cutter of this invention comprises a base
member having disposed thereon at least one raised planar cutting
surface, a platen having an opening corresponding to said planar
surface which is adapted to receive a length of the material from
which a segment is to be cut. The platen overlays the raised planar
surface retaining the desired portion of the material and forming a
track in which a hard, rotating spherical ball is adapted to ride
and move around said track by means of a hand tool. The hard
spherical ball exerts pressure against the outer edge of the raised
planar surface to cut the desired portion of said material. The
planar surface and its corresponding track define the shape and
size of the segment to be cut.
BRIEF DESCRIPTION OF THE DRAWINGS
A better understanding of the invention can be had by referring to
the accompanying drawing in which like reference numbers refer to
like parts in the several views, and in which:
FIG. 1 is a perspective view of one embodiment of this invention
having one raised planar cutting surface;
FIG. 2 is a side view in partial section taken along the line 2--2
of FIG. 1;
FIG. 3 is an end view in section taken along the line 3--3 of FIG.
2;
FIG. 4 is a bottom view of a second embodiment of this invention;
and
FIG. 5 is an end view of the segment cutter of FIG. 4 showing a
segment cutter having raised planar cutting surfaces on both
sides.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring initially to FIGS. 1 - 3 a segment cutter 10 is shown
comprising a base member 11 having attached thereto a raised planar
surface 12 having a peripheral cutting edge 21. A sheet of paper 13
from which a segment is to be cut is held in place by platen 14
which can be raised as shown in FIG. 3 by phantom lines 16. The
paper 13 is placed on top of planar surface 12 and platen 14 closed
over the paper thereby holding the paper securely in place. The
platen 14 which overlays the raised planar surface 12 has an
opening corresponding in shape and configuration to the raised
planar surface thereby forming a track 17 about the periphery of
the raised planar surface. A tool 18 having a hard spherical ball
19 is furnished, the ball 19 being of the proper size so that when
it is pressed firmly into track 17 pressure is exerted against the
cutting edge 21 of raised planar surface 12.
Hard spherical ball 19 is held in the tool 18 in such a manner that
it is easily rotated when the tool is moved along the track 17. One
configuration suitable for holding the ball in a rotatable manner
is shown in FIG. 3, where ball 19 is held in place by sleeve 22 and
when tool 18 is pushed down into track 17 ball 19 rides against a
porous, oil-impregnated bearing 23 providing a low-friction
interface between the ball and the bearing allowing easy rotation
of the ball as it moves along the track.
The ball 19 when riding in track 17 forms a cutting angle 20 with
upper cutting edge 21 of raised planar surface 12. This cutting
angle 20 is defined by a line drawn from the point of contact
between the ball 19 and cutting edge 21 through the center of the
ball and the vertical axis of the segment cutter 10. The cutting
angle 20 will generally be in the range of 25 to 55 degrees
preferably in the range of 35 to 50 degrees. It has been found
angles above 55 degrees or below 25 degrees result in segment
cutters which do not function as well as the preferred embodiments
and require substantially more force in order to make a clean
cut.
The ball can be formed of numerous metals and alloys which are hard
and can be finished to form a smooth, spherical shape. A preferred
ball is the hardened steel bearing material available as ball
bearings from many companies. The ball bearings come in several
sizes and are sufficiently hard to insure a long life.
The planar surface 12 is formed of a hard material generally having
a hardness greater than 40 Rockwell C preferably harder than 45
Rockwell C, e.g. tempered carbon steel, martensitic stainless steel
or heat treated alloy steel and is of a softer material than the
ball. The flat planar surface is shown with a smooth upper edge and
rounded corners, the rounded corners helping to keep an even
pressure between the ball and edge during use as well as
contributing to increased life of the cutting edge. It is possible,
however, to form a cutting surface with square corners or to form a
notched upper edge which would form a perforated cut around the
specimen for later detachment of the specimen.
The segment cutter is supported on a base surface 23 which may be a
table top, desk top or the like by legs 24 which are normally made
of a cushioning material such as rubber or firm foam material which
provides a soft support for the segment cutter and also provides a
slip resistant surface between the supporting surface 23 and the
segment cutter 10.
When the cutting edge 21 has become worn from repeated use, the
flat planar surface 12 can be disengaged by removing the fastening
means 26 and a new flat planar surface installed. The
replaceability of the planar surface 12 and its associated cutting
edge insures that proper cutting action can be maintained over
extended periods of time without the need for replacing the entire
segment cutter.
A second embodiment of the segment cutter of this invention is
shown in FIGS. 4 and 5 wherein both sides of the segment cutter are
adapted for cutting segments of varying sizes. As shown in FIG. 4
one side of the segment cutter of this embodiment contains two
raised planar surfaces 27, 28 which have corresponding openings 29,
30 in the platen 32.
FIG. 5 shows the embodiment of FIG. 4 in an open configuration
platen 14 and planar surface 12 having a configuration similar to
those shown in FIG. 1 and platen 32 having the configuration shown
in FIG. 4. The segment cutter of this embodiment allows different
size segment patterns to be cut so that the segment size which best
suits the need for accurate record keeping can be cut from any of
the various strips or charts common in the medical field. The
operation and configuration of this embodiment are similar to that
of the embodiment shown in FIG. 1.
Various modifications and alterations of this invention will become
apparent to those skilled in the art without departing from the
scope and spirit of this invention, and it should be understood
that this invention is not to be limited to the illustrative
embodiments set forth herein.
* * * * *