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Патент USA US2127002

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Aug. 16, 1938.
2,127,002
D. R. MURPHY
SHEARING DEVICE
Filed Nov. 11, 1937
2 Sheets-sheaf, l
35'
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1'16. 3.
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_
INVENTOR
DAN R. MURPHK
wq'm‘
ATTORNEYS.
Aug. 16, 1938.
D. R. MURPHY
2,127,002
SHEARING DIEVICE
Filed Ndv. ‘11, 1957
2 Sheets-Sheet 2
QM.
}:I__________
l...____ _.___l_
1
INVENTOR.
174” R. MUIPPHK
ATTORN EYS.
‘Patented Aug. 16, 1938
2,127,002
UNITED STATES PATENT OFFICE
2,127,002
SHEARING DEVICE
Dan R. Murphy, ,Middletown, Ohio, assignor to
The American Rolling Mill Company, Middle
town, Ohio, a corporation of Ohio
Application November 11, 1937, Serial No. 174,093
10 Claims. (Cl. 164-63)
My invention relates to shearing devices for enlarged scale of that part of Fig. 2 to which my
shearing what are referred to in the trade as
“circles” from square blanks, and more particu
larly it relates to an attachment which may be
added to a conventional rotary shearing device
for the purpose of enabling such devices to cut
perfect circles.
In the cutting of circles from square blanks. it
10 is, of course, necessary to get the cutting edges
onto the proper line of cut, which may be a slight
distance from the edge of the blank. In the past.
this has been done in one of two ways; either the
cooperating cutting edges of the shear have been
separated and the blank inserted therebetween
and the cutting edges then brought together on
the line of cut, or the blank was simply shoved
against the cutting elements, which then cut
into the desired line of cut from the edge of the
ii)
blank.
Both of these alternatives have disadvantages.
The operation of opening the cutting elements to
admit the blank is relatively slow and consumes
valuable time, while if the. other alternative is
used. the ?nished circle is not truly circular, but
has a slight ?at place adjacent the point where
the line of cut passes to'the proper circumfer
ence of the circle.
With the above di?iculties in mind, it is an
object of my invention to provide a device which
a:
is extremely simple and relatively cheap to man
ufacture, which will permit the cutting of per
fect circles from square blanks.
It is a further object of my invention to pro
_ vide such devices which may be attached to a
l.)
conventional rotary shear without di?lculty.
Another obiect of my invention is the provision
of a device as above outlined. which will cut cir
cles from square blanks without leaving a ?at
place on the circumference and without increas
40 ing
the time of the operation.
'
These and other objects of my invention which
will be apparent to one skilled in the art upon
reading these speci?cations, or which will be
_ pointed out hereinafter. I accomplish by that
certain construction and arrangements of parts
of which I shall now describe an exemplary em
bodiment.
Reference is made to the drawings forming a
part hereof and in which:
50
Figure 1 is a plan view of a blank shown in its
relation to a clamping element, a side stop, and
cutting element.
,
Fig. 2 is an elevational view of a rotary shear
55
‘embodying my invention.
Fig. 3 is a detailed cross sectional view on an
invention particularly relates.
~Referring now to Fig. 2, I have shown some
what diagrammatically a more or less conven
tional rotary shear comprising a frame 30, hav
ing a base extension M. The frame 30 carries
the parallel shafts 3 and 4, which, respectively,
carry the rotary knives 5 and 6.
The shafts 3
and It may or may not be geared together, as
desired. A pulley ‘l is provided on the shaft 3 for
driving the same from any suitable source of
power. In view of the fact that it may be neces
sary to bring the knives 5 and t closer together
‘as they become worn, the shaft 3 is provided with
a pivoted bearing indicated generally at 9. A
screw, provided with a handle indicated gener
ally at 3, is provided for the purpose of raising
and lowering the right hand end of the shaft 31.
For the purpose of providing for relative axial
adjustment of the knives, the shaft e is provided ‘’
with clamping nuts indicated generally at I0 and
ii, cooperating with a portion of the frame 30,
whereby the knife 6 may be moved toward the
right or left with respect to the knife 5.
Mounted in ways in a conventional manner
upon the base extension it is a table l2. The
table i2 is provided with a nut i5, adapted to co
operate with a threaded portion of the shaft M.
The shaft it may be turned by means of a hand
wheel it for the purpose of adjusting the position
of the table E2 on the base 36 with respect to the
knives 5 and 6.
Referring now more particularly to Fig. 3, the
table i2 carries a supporting member I9 pivoted
thereon by means of a stud at 58. The position C: Li
of the member i9 may be ?xed upon the table by
means of the nut and bolt arrangement indicated
generally at 32.
'
A clamping member indicated generally at H,
and comprising upper and lower clamping jaws 46
Ila and Nb, is mounted in ways 33 on the mem
ber l9, so that after the position of the table I 2 has
been set, further movement toward and away
from the cutting knives is provided by movement
of the member ll in the ways 33. The member
H has threaded into it, a piston rod 34 which is
A Ll
attached to a piston 28 in the cylinder 26, which
is ?xedly mounted upon the member ill. The
limit of movement toward the left of Fig. 3 is
provided by abutment of the hub portion of the
piston 2i against the cylinder head 20a. The limit
of movement of the piston 25 toward the right of
Fig. 3 is ?xed by the position of the limit screw 22.
The cylinder 20 may be pneumatic and if so,
will be connected to a suitable source of pressure 55
2,127,002
I' and ‘provided with suitable valves.- An exemplary
‘ limit of movementtoward the left is indicated by
of rotary knives mountedlonisaid base, a table ' ‘
mounted on said base in such manner that the
the broken line representing the left-hand edge distance between said table and said knives may
of the member ll in its furthest position toward be varied, a clamping device slidably mounted on '
the left. In Fig.4, this movement is represented said table, pneumatic means for urging said
by the broken circular line representing the posi \clamping' device toward said‘ knives, said last
mentioned means comprising an air cylinder and
tions of the upper jaw I'Ia.
In Fig. I, the blank is indicated at l and an a piston therein attached to said clamping de
appropriate disappearing side stop is indicated vice, the abutment of said piston against the
head end of the cylinder serving to limit the ex 10
at 2. The arrow indicates the direction of rota
tent of the slidable movement toward said knives,
tion.
,
The operation of my device will be apparent and means for limiting the movement of said
from what has been said above. A blank I to clamping device away from said knives.
6. In a circular shearing device, a base, a pair
be cut to circular form is placed between the jaws
15 11a and I'll), which are then tightened by any of rotary knives mounted on said base, a table
conventional arrangement‘ such as is indicated
generally at 35. The table 12 is adjusted toward
mounted on said base in such manner that the
distance between‘said table and said knives may
be varied, a clamping device slidably mounted on
the left until the edge of the blank touches the"
shearing point of the knivesi and 6. The knives said table, pneumatic meansv for urging said
20 are then set into rotation by any suitable means .clamping device toward said knives, means lim 20
and air is admitted to the right-hand end of the ‘ iting the extent of said slidable movement to
cylinder 20, whereby the clamping member I1 is
urged toward the left as indicated in the draw
" ‘ings.
Of course, the machine will be so set up
25 that when thev member I‘! is in its extreme left
hand position, the cutting point of the knives 5
and 6 will be on the desired circumference of the
?nished circie.~ As the knives rotate and out,
they of course, feed the blank rotatably.
It will be understood that modi?cations may
be made in my invention without departing from
the spirit of it.
.
,
.
, said knives.
7. In a circular shearing device, a base, a pair 25
01’ rotary knives mounted on said base, a table
mounted on ‘said base in such manner. that the
distance between said table and said knives may
be varied, a support pivotally mounted on said
table, a clamping device slidably mounted on said 30
support, and means for urging said clamping
, device toward said knives.
‘
Having thus described my invention, what I
claim as new and desire. to secure by Letters
_P_atent>is:—-
ward said knives, and means for limiting the
movement of said clamping device away from
_-,_
.
8. In a circular shearing device, a base, a pair
of rotary knives mounted on said base, a table
_ mounted on said base in suchumanner that the
_- ‘ 1-. In a circular-shearing device, a base'fa pair distancebetw'een said table and said knives may
of rotary knives mounted on said base, a table" " be varied, a support'pivotally mounted on said"
mounted on said base in such manner that the table, a clamping device slidably mounted on
distance between said table and said knives may said support, pneumatic means for urging said
40 be varied, a clamping device slidably mounted on
said table, and means urging said clamping de
vice toward said knives.
2. In a circular shearing device, a base, a pair
of rotary knives mounted on said ‘base, a table
mounted on said base in such manner that the
distance between said table and said knives may
be varied, a clamping device slidably mounted
on said table, means for urging said clamping
device toward said knives, and means limiting the
extent of said slidable movement.
clamping device toward said knives, and means 40
limiting the extent of said slidable movement to
ward said knives.
9. In a circular shearing device, a base, a pair
of rotary knives mounted on said base, a table
mounted on said base in such manner that the
distance between said table and said knives may
be varied, a support pivotally mounted on said
table, a clamping device slidably mounted on
said support, pneumatic means for urging said
clamping device toward said knives, said last
3. In a circular shearing device, a base, a pair
of rotary knives mounted on said base, a table
mentioned means comprising an air cylinder and
a piston therein attached to said clamping de
mounted on said base in such manner that the
vice, the abutment of said piston against the head
end of the cylinder serving to limit the extent
of the slidable movement toward said knives.
distance between said table and said knives may
be varied, a clamping device slidably mounted
on said table, pneumatic means for urging said
clamping device toward said knives, and means
limiting the extent of said slidable movement
toward said knives.
4. In a circular shearing device, a base, a pair
of rotary knives mounted on said base, a table
mounted on said base in such manner that the
distance between said table and said knives may
be varied, a clamping device slidably mounted on
65 said table, pneumatic means for urging said
60
clamping device toward said knives, said last
mentioned means comprising an air cylinder and
a piston therein attached to said clamping device,
the abutment of said piston against the head end
of the cylinder serving to limit the extent of the
slidable movement toward said knives.
5. In a circular shearing device, a base, a pair
10. In a circular shearing device, a base, a
pair of rotary knives mounted on said base, a
table mounted on said base in such manner that
the distance between said table and said knives
may be varied, a support pivotally mounted on' -"
said table, a clamping device slidably mounted on
said support, pneumatic means for urging said
clamping device toward said knives, said last
mentioned means comprising an air cylinder and
a piston therein attached to said clamping de
vice, the abutment of said piston against the head
end of the cylinder serving to limit the extent
of the slidable movement toward said knives,
and means for limiting the movement of said
clamping device away from said knives.
DAN R. MURPHY.
s
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