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Патент USA US2133812

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Oct. 18,‘ 1938.
A, G'ELLLJVIAN
2,133,812
CLAMP SCREW AND NUT FOR A TUCKING KNIFE
Filed Feb. 4, 1957
. Fig.1.
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Patented~ Oct. 18, 1938
2,133,312
UNITED STATES
PATENT OFFICE ‘
2,133,812
CLADIP SCREW AND' NUT FOR A TUCKING
KNIFE
Abraham Gellman, New York, N. Y.
Application February 4, 1937, Serial No. 123,966
3 Claims. (Cl. 85—-5)
This invention relates to new and useful im
provements in a clamp screw and nut for holding
the arms of a tucking knife in adjusted position.
The invention has for an object the construc
0 tion of a knife as mentioned which is character
ized by the fact that it has an arm adapted to be
pivotally mounted and a blade with a straight edge
over which the material to be tucked may be fold
ed, and said blade being connected with the arm in
[0 a novel and advantageous manner.
More speci?cally, the invention contemplates
jacent a hollowed area Me.
ranged so that the material which is being tucked,
is guided to a closev position to the operating
needle of the sewing machine.
The stem portion Mb, is formed with a slot I‘!
Still further the invention proposes an arrange
tional convenience is provided for adjusting the
tucking knife.
For further comprehension of the invention,
35 and of the objects and advantages thereof, refer
ence will be had to the following description and
accompanying drawing, and to the appended
claims in which the various novel features of the
invention are more particularly set forth.
In the accompanying drawing forming a ma
terial part of this disclosure:
Fig. 1 is a plan view of a sewing machine
equipped with a tucking knife according to this
invention.
35
Fig. 2 is a plan view of the tucking knife per se.
Fig. 3 is an edge elevational view of Fig. 2.
Fig. 4 is a bottom view of Fig. 2.
Fig. 5 is a transverse sectional view taken on
the line 5--5 of Fig. 2.
L0
Fig. 6 is a view similar to Fig. 5 but illustrating
a modi?cation of the invention.
A
The tucking knife, according to this invention,
comprises an arm l0 adapted to be pivotally
mounted at the point II on the table [2 of a
Ea sewing machine l3. This arm is associated with
a blade 14 having a straight edge Ma and also
b
tucking knife. The opposite edge of the blade I4
is formed with a projecting ?nger portion Md ad
connecting the blade and arm with each other by
ment by which the clamp screw is made of several
sections and arranged so that the head portion
30 thereof may be released when desired to eliminate
the necessity of opening the screw. Thus, addi
These parts are ar
through which the clamp screw passes. The
groove It!a is formed by merely recessing a groove
into the top face of the arm It). At the area where
the groove is formed the arm II! has a widened
portion I00. This widened portion is imprinted
0r inscribed in any other manner with a scale I8.
A line [9 is formed upon the stem “lb and co
operates with the scale to indicate the positions
of the blade M.
25
The clamp screw l5 has a large and ?at head
I5a. It has a screw portion 15b extending through
the slot l1 and through an opening 20 in the arm
II]. A nut 15¢ threadedly engages on the screw
portion l5”. A friction washer I5d is interposed 30
between the nut I5° and the bottom face of the
arm
I0.
_
'
-
To adjust the blade 14 it is merely necessary to
pivot it to an inoperative position as shown in Fig.
1 and then to turn the nut l5c to loosen the clamp 35
screw. The blade and arm may then be relatively
adjustedas required. The nut I50 is then tight
ened.
In Fig. 6 a modi?cation of the invention has
been disclosed which distinguishes from the prior
form in the fact that the head of the clamp screw
may be loosened to release the blade, in addition
to the fact that the nut may be loosened for the
same purpose.
There is therefore a choice for
loosening the parts.
More speci?cally, according to this form of the
having a stem portion Mb slidable in a groove H19“
in the arm H). A clamp screw I5 is associated
invention, the clamp screw has a head portion
with the stem and arm for holding these parts
shank 21 engages.
in relatively adjusted positions.
The full line position of the tucking knife,
shown in Fig. l, is the operative position in which
cloth material, indicated by the dot and dash line
it may be folded over the edge of the tucking
knife and fed to the sewing machine. The dot
V
The arm ‘[0 is formed with an aperture lla
through which the pivot element II passes to
pivotally mount the arm upon a sewing machine OI
table. The blade M has its outer extremity l4c
bent downwards to engage the top face of the
sewing machine table so that the goods which is
being operated upon will merely slide over the
the use of a groove and tongue arrangement and
providing a single clamp screw which may be
opened to loosen the blade and arm so that they
may be adjusted, or which may be closed.
30
and dash lines indicate 2. moved position of the
tucking knife in which it is inoperative.
25 formed with a recess 26 into which a headed
A resilient washer 28 is in
terposed between the base of the recess 26 and
the head of the shank 21. Several pins 29 are
mounted in the head 25 and extend into the recess
26 and engage against a shoulder 2‘!,1 of the
headed shank 21. This shoulder is formed with
cam cutouts 30 arranged so that in a certain posi 56
2,133,812
tion of the head 25 the pins 29 are aligned with
the cutouts and then the head 25 is loose, and in
another position the pins 29 straddle the cutouts
30 and engage beneath the shoulder 2'!11 and then
the head 25 is tight. The shank 21 passes through
the slot I‘! in the stem Mb. It also passes through
the opening 20 in the arm I0 and threadedly en
against a shoulder formed by the bottom face of
the head on said headed shank, said shoulder
having cam cutouts formed radially therein and
into which said pins may engage for releasing
said head portion, and a resilient element inter
posed between the base of said recess and the
head of the shank.
gages the nut l5°. There is also a friction washer
151 between the nut and the arm. The top face
2. In a device of the class described a clamp
screw and nut for holding the arms of a tucking
10 of the nut 25 is formed with a hollow portion 258L
adapted to receive a thumb.
As shown in Fig. 6 the parts are clamped to
gether. When required the head 25 may be
slightly forced downwards against the action of
the resilient element 26 and then the head 25
turned to align the pins 29 with the cutouts 30.
The blade 14 and arm ID are then loose and may
be adjusted. They may be re-tightened by turn
ing the head 25 to cause the pins 29 to ride be
20 neath the shoulder 21a.
The blade and arm may
also be loosened by operating the nut I5°.
While I have illustrated and described the pre
ferred embodiments of my invention, it is to be
understood that I do not limit myself to the
precise constructions herein disclosed and the
right is reserved to all changes and modi?cations
coming within the scope of the invention as de
?ned in the appended claims.
Having thus described my invention, What I
claim as new, and desire to secure by United
States Letters Patent is:—-
r
1. In a device of the class described a clamp
screw and nut for holding the arms of .a tucking
knife in adjusted positions, comprising a headed
shank portion and a head portion, the head of
the shank portion engaging into a recess in said
head portion, pins on the head portion engaging
knife in adjusted positions, comprising a headed 1O
shank portion and a head portion, the head of
the shank portion engaging into a recess in said
head portion, pins on the head portion engaging
against a shoulder formed by the bottom face of
the head on said headed shank, said shoulder 15
having cam cutouts formed radially therein and
into which said pins may engage for releasing
said head portion, and a resilient element inter
posed between the base of said recess and the
head of the shank, the outer face of the head por
tion being recessed.
3. In a device of the class described a clamp
screw and nut for holding the arms of a tucking
knife in adjusted positions, comprising a headed
shank portion and a head portion, the head of
the shank portion engaging into a recess in said
head portion, pins on the head portion engaging
against a shoulder formed by the bottom face of
the head on said headed shank, said shoulder
having cam cutouts formed radially therein and 30
into which said pins may engage for releasing
said head portion, and a resilient element inter
posed between the base of said recess and the
head of the shank, said resilient element com
prising a rubber disc.
ABRAHAM GELLMAN.
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