DECAL
Year: 1895

page_text: Date of Application (in United Kingdom), 25th Sept., 1895
Complete Specification Left, 25th Sept., 1895-Accepted, 2nd Nov., 1895
COMPLETE SPECIFICATION.
DECAL.
I, ALFRED JACOB KRANK, a citizen of the United States of America, residing
at 159 Aurora Avenue, Saint Paul, Minnesota, United States of America, Cutler,
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement :-
My invention relates to improvements in joints for shears, scissors and the like.
The object of my invention is to produce a joint that will keep the blades in
contact throughout the entire length, thereby rendering the blades self-sharpening,
and which will, at the same time, permit the ready adjustment of the pressure on
the joint, so that the wear may be easily taken up.
My invention consists in the features, details and combinations of parts which
will first be described in connection with the accompanying drawings and then
particularly pointed out in the claims.
In the drawings-
Fig. 1 is a plan view of one form of shears embodying my invention, the blades
being in their closed position.
Fig. 2 is a similar view taken from the opposite side, the handles being broken
away.
Fig. 3 is a view similar to Fig. 1, but showing the blades in their open position,
the handles being broken away.
Figs. 4 and 5 are detail views of portions of the blades, showing the slot in one
blade and the segmental block attached to the other blade.
Fig. 6 is a perspective view of the spring plate.
Fig. 7 is a detail view of the pins and block taken apart, and
Figs. 8 and 9 are detail sections of the joint.
Fig. 10 is a transverse section on the line 10 10, Fig. 2.
Referring to the drawings, A, B, are two blades of a pair of scissors or shears,
to one, A, of which is attached a segmental block, a, preferably by means of a
screw, a¹, at one end, which passes through the block and is threaded into the
blade, A. The other end of the said block is provided with a pin hole which
registers with a hole in the blade, A, through which holes, indicated at a, Fig. 4,
is passed a pivot pin, C.
The blade, B, has a segmental or arc-shaped slot, b, arranged to receive the
block, a, and longer than the latter, i.e., containing more degrees of curvature than
the latter. The pin, C, which passes through the holes in the block, a, and
through the blade, A, is provided with a head, c, which may be made large enough
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Price 8.1

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to extend beyond, the segmental slot, in order to hold the blade, B, to the blade, A,
or a washer, c', may be provided, as shown in the drawings, this washer resting
between the blade, B, and the head, c.
In order to hold the opposite end, &, of the pin, against withdrawal and, at the
same time, draw up on it, I provide the said end, c, of the pin, with notches, c³, c³,
engaged by tongues, d, d', respectively, these tongues being formed on a spring
plate, D, which has a hole, d', through which passes the end, c, of the pin, C. The
spring plate, D, is provided with an arm, d³, which has its end reduced and bent
downward and under, as shown in Fig. 6, to form a dog, d', which is arranged to
engage the top surface of the blade, A, which may be roughened to hold the spring
plate, the dog being adapted, preferably, to enter any one of a series of notches, a³,
cut on the outer surface of the blade, for a purpose hereinafter described. The
front end of the spring plate is bent downward and is sloped or beveled, as shown
at d³, and the blade, A, is provided with an inclined surface, d', adapted to be
engaged by the inclined surface of the downward-bent end, d³, of the spring
plate, D. By moving the dog, d, from one notch to another, the tension of the
spring plate may be adjusted, since it causes the inclined surface, d, of the spring
plate, to move up or down on the inclined surface, a', on the blade, whereby the
plate is pushed farther away from the blade or allowed to come nearer to it, thus,
of course, putting more or less outward strain on the pin, C, and determining the
tension with which the blades are held together.
It will be observed from Fig. 9 that the pivot pin, C, is not at right angles to
the blades, but, instead, is slightly tilted forward, whereby the front edge of the
head or washer bears on the surface of the blade, B, forward of the pivotal point,
thereby always keeping the blades with their cutting edges in close contact
throughout their whole length. By thus holding the blades closely against each
other along their cutting edges, the wear, which takes place sharpens the cutting
edges.
The segmental slot and blade acting together cause the blade, B, to move
forward and backward during its operation of opening and closing, thus producing
a shear or draw cut.
As the blades wear from continued use, the lost motion may be taken up by
moving the spring plate as before described to increase the tension on the pin, C,
and, when the wear becomes so great that the lost motion can not be taken up in
this way, the spring plate may then be arranged with its tongues in engagement
with the second pair of notches, thus practically shortening the length of pin
employed and giving a greater tension which effectually takes up all the wear until
the shears are entirely worn out.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. The combination, with a pair of blades, one of which has a segmental slot, of
a segmental block shorter than the slot in the blade and located therein, said block
being secured at one end to the other blade, a pin passing through both blades and
through the block, said pin being provided with a head engaging the slotted blade,
and a fastening device at the opposite end of the pin, substantially as set forth.
2. The combination, with a pair of blades, of a pin passing through both
blades, and a spring blade engaging the pin and provided with an inclined surface
bearing on the surface of one of the blades, substantially as set forth.
3. The combination, with a pair of blades, one of which has an inclined surface,
of a pin passing through both blades and provided with notches at one end, and a
spring plate engaging the notches.in the pin and provided with an inclined surface
engaging the inclined surface on the blade and movable thereon, whereby the
tension of the spring plate may be adjusted, substantially as set forth.
4. The combination, with a pair of blades, one of which has an inclined surface,
of a pin passing through both blades and provided with notches at one end, a
"

page_text: spring plate engaging the notches in the pin and provided with an inclined surface.
engaging the inclined surface on the blade and movable thereon, said spring plate
also having an arm arranged to rest in frictional contact with one of the blades,
substantially as set forth.
5. The combiuation, with a pin provided with notches, and a pair of blades.
through which the pin passes, one of which is provided with an inclined surface on-
one side of the pin, and a roughened surface on the other side of the pin, of a spring
plate provided with tongues engaging the notches in the pin and with an inclined
surface engaging the inclined surface on the blade, said spring plate also having
an arm engaging the roughened surface on said blade, substantially as set forth.
6. The combination, with a pin provided with notches, and a pair of blades.
through which the pin passes, one of which is provided with an inclined surface on
one side of the pin and a series of notches on the other side of the pin, of a spring
plate provided with tongues engaging the notches in the pin and with an inclined
surface engaging the inclined surface on the blade, said spring plate also having an
arm engaging any one of the notches on said blade, substantially as set forth.
7. The combination, with a pair of blades, of a pin passing through said blades.
at an angle and provided with a head at one end and with notches at the other end,
and a spring plate provided with tongues engaging said notches and with a cam.
surface engaging one of the blades, substantially as set forth.
8. The combination, with a pair of blades, one of which has a cam surface, of a.
pin passing through both blades at an angle and provided with a head at one end
and with notches at the other end, and a spring plate engaging the notches in the
pin and provided with a cam surface engaging the cam surface on the blade,.
substantially as set forth.
9. The combination, with a pair of blades, one of which has a cam surface and
a series of grooves, of a piu passing through both blades at an angle and provided
with a head at one end and a series of notches at the other end, a spring plate.
having tongues engaging the notches, a cam surface on the blade, and an arm.
engaging the grooves in the blade, substantially as set forth.
Dated this 24th day of September 1895.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.