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Патент USA US3038372

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June 12, 1962
.1. N. PORTERFIELD
3,038,362
METAL BAR SHEARS
Filed May 26, 1958
4 Sheets-Sheet 1
IN VEN TOR.
‘w
A TTORNEY
June 12, 1962
J. N. PORTERFIELD
3,038,362
METAL BAR SHEARS
Filed May 26, 1958
4 Sheets-Sheet 2
June 12, 1962
J. N. PORTERFIELD
3,038,362
METAL BAR SHEARS
Filed May 26, 1958
4 Sheets-Sheet 5
42.
33
. 7.
.8.
INVENTOR.
JACK /V. PORTER/WELD
June 12, 1962
J. N. PORTERFIELD
3,038,362
METAL BAR SHEAR-S
Filed May 26, 1958
4 Sheets-Sheet 4
INVEN TOR.
JACK N PORTER/WELD
ATTORNEY '
lC€
3,038,3?2
Patented June 12, 1962
2
3,038,362
METAL BAR SHEARS
Jack N. Porter?eld, Denver, Colo, assignor, by mesne
assignments, to Coors Porcelain Company, Golden,
(1010., a corporation of Colorado
Filed May 26, 1958, Ser. No. 737,791
4 Claims. (Cl. 83—317)
FIG. 8 is a diagrammatic view illustrating the pivotal
disposition and arcuate paths of travel of the cutter blades
from their “rest” to their cutting positions.
FIG. 9 is a view similar to FIG. 1, showing the upper
and lower cutter blades in initial and in shearing posi
tions, and also showing the upper cutter after having been
swung about its pivotal mounting by the advancing metal
strip.
'
This invention relates to shearing mechanism known
In the embodiment of the invention shown in the draw
in the art as “?ying shears” adapted for cutting longi 10 ings, the shear mechanism comprises a pair of upright
tudinally moving strips or bars of metal into uniform
?xed frame members 10, 11, provided with braces 12
pieces of selected length.
secured to the frame members by cross bracket 13.
Ad
The main object of the invention is to provide mech
jacent to ‘and between the inner side surfaces of the
anism e?icient for its intended purpose, simple and eco
frame members 10, 11 is a swinging shear frame indi
nomical in construction and operation, and capable of 15 cated as a whole at 14, comprising two identical side
producing a clean cut through the metal strip or bar
members 15, pivotally mounted at their lower ends on
without bending, twisting or otherwise distorting the
the shaft 16 supported in the plates 17 spaced from the
strip.
side members by buttons 18.
.
In my improved construction, upper and lower cooper
The upper ends of the swinging frame side members
ating blades ‘are ‘?xed in holders which are pivotally 20 15 are mounted on opposite ends of ‘a shaft 19, which
mounted on one swinging shear frame, the latter being
ligidly connects the said side members together. A
pivotally connected at its lower end to a ?xed frame or
tubular housing 20 rotatably surrounds the shaft between
support. Actuation of the swinging frame about its
the side members 15, and is provided with a piston rod
pivotal connection to the ?xed support causes the pivotal
clevis 21 which is thus made pivotal relatively to the
centers of the blade holder connections to the swinging 25 swinging shear frame and to the cylinder mounting
frame to move in different arcuate paths concentric with
bracket 22 on the upper portions of the ?xed frame
said pivotal connection of the swinging shear frame to
members 10, 11. Any suitable means for reciprocating
the ?xed frame. However, due to certain novel ‘arrange
the swinging shear frame 14 about the shaft 16 may be
ments of the blade holders, the upper and lower blades
provided, the piston rod clevis 21 and cylinder mounting
move in arcuate but non~concentric paths when the swing 30 bracket 22 being adapted for connection to parts of
ing shear frame is ‘actuated. The positions of the blades
hydraulic mechanism (not shown) for this purpose.
in their respective holders, the pivotal mounting of the
On the inner surface of each side member 15 of the
holders on the swinging shear frame, and the provision
swinging shear frame 14 is a web plate 23. A stop plate
of pivoted supporting arms between the lower blade
24 is rigidly secured to, and extends across the space
holder and the fixed frame of the machine cooperate 35 between the two side members 15 to serve as ‘a stop for
to produce a cutting operation ‘whereby the cut edge of
the swinging upper blade and holder indicated as a whole
the moving metal strip or bar is a smooth surface per
at 25.
pendicular to the horizontal surfaces thereof, without
Upper and lower blades ‘and their holders extend across
the space between the side members 15 of the swinging
bending, twisting or otherwise ‘distorting the strip.
Due to the construction and arrangement of the parts,
shear frame on which they ‘are mounted. The upper
motive power need be applied to only one element,
blade 26 is mounted in the block 27 which constitutes a
namely, the swinging shear frame which carries both of
holder for the blade, the upper part of the holder being
the pivotally movable blade holder units. The lower
rigidly connected to a tubular member 28 rotatably
blade holder supporting arms, pivotally connected vto the
mounted on a horizontal shaft 29 ?xedly mounted in the
?xed frame of the machine, are actuated by the move 45 side members 15 of the frame 14. The lower surface
ment of the holder on the swinging shear frame. Thus
of the blade 26 is slightly inclined upwardly toward the
all the parts ‘move automatically to produce the cutting
holder, whereby a sharp cutting edge St} is formed on the
operation by the application of motive power to a single
blade. Thus the parts 26, 27 and 23 constitute a swing
element, the swinging shear frame, to reciprocate the
frame relatively to the ?xed support.
In the drawings:
ing upper blade unit which normally depends from the
50 shaft 2§ with the side surfaces of the holder 27 in sub
stantially vertical planes except when the swinging shear
FIG. 1 is an elevational view of one side of the ?xed
frame 14 is in the extreme left or rest position shown in
frame ‘and of the swinging shear frame of shearing mech
FIG. 1 where the stop plate 24 engages the blade holder
and tilts it slightly as shown.
anism embodying my invention, showing the parts in the
position of rest before beginning the cutting operation, 55 The lower blade and holder unit indicated as a whole
the upper and lower ends of the ?xed frame being broken
at 31 comprises a blade 32 mounted in a block 33 which
away.
?ts in a block 34 provided with side plates 35 (FIG.
FIG. 2 shows the mechanism of FIG. 1 at the comple
6), pivotally mounted on shaft 36 in the swinging shear
tion of the cutting operation.
frame 14. The pivotal connection between the lower
FIG. 3 is a front elevational view of the machine, with 60 blade unit 31 and shear frame members 15 is located
the parts in the position of FIG. 2.
near the left hand or rearward part of the unit, removed
from the blade 32. The right hand or forward portion
‘FIG. 4 is ‘a sectional view taken in a vertical plane
of the unit is loosely supported on a lower blade holder
through the transverse center of the blade holders and
support which comprises a pair of supporting arms 37
blades as shown in FIG. 1.
_
FIG. 5 is a sectional view similar to FIG. 4 but show 65 located adjacent and between the swinging frame mem
bers 15, the arms 37 being connected by a plate 38 and
ing the blade holders and blades in the positions shown
screws 39. The lower ends of the supporting arms 37
in FIG. 2.
are pivotally mounted on a shaft 40 mounted in and
FIG. 6 is a front elevational view of the lower blade
extending across between the ?xed frame members 10, 11.
holder.
The upper ends of the supporting arms 37 are curved
FIG. 7 is a fragmentary side elevational view of the 70 as indicated at 41, the curved edge merging into a ?at~
lower blade holder.
tened portion 42 on the upper forward end of each arm
3,0
ea
3
4
37. The upper curved edges 41 loosely engage a com
plementally curved lower surface 43 formed in each of
cutter unit 31 to tilt about its pivot 36 (due to the arms
37 loosely engaging the side members 35 of lower cutter
the side members 35 of the lower blade unit by cutting
away the forwardly projecting portion of said holder
the lower blade 32 from the position of FIG. 1 to that of
unit 31 and pivoting about pivot 46), thereby raising
A
FIG. 2, and moving the blades 26 and 32 into shearing
spring 44 ?xed on the inner surfaces of each of the swing
relationship. The thickness of the strip 45 is exaggerated
in the drawing for sake of clarity. For example, the
side members as shown in FIGS. 1, 2, 4, 5 and 8.
ing frame members 15 bears on the upper edge of the
work 45 may be a strip only one-quarter inch in thickness
blade holders unit 31 at each side to maintain the en
and thus would appear in the application drawings as less
gagement between holder unit and supporting arms 37.
In FIGS. 1 and 4, the swinging shear frame 14- is 10 than one-sixteenth inch in thickness if it had not been ex
shown in its extreme left hand or rearward “at rest“
position. The continuously traveling strip or bar 45 is
supported on rolls (not shown) and when the shearing
mechanism is in this position, the strip or bar does not
aggerated.
Thus the axes of the shafts 29 and 36 which constitute
the pivotal connections of the upper and lower blade units
to the swinging frame 14 move in concentric paths about
the axis of the shaft 16 when the frame 14 is reciprocated
rest on the top of the lower blade holder but is spaced
about said shaft 16, but the blades 26 and 32 carried by
therefrom, the blade holder top surface being inclined
the blade units move in arcuate but non-concentric paths
downwardly from rear to front as shown. The blade
toward opposite surfaces of the traveling strip 4-5. in
holder unit 31, being pivotally mounted at 36, and loose
the cutting position the upper surface of the lower blade
ly supported in its forward portion on the supporting
arms 37, is in its lowermost position when both the 20 holder lies in a horizontal plane, the parallel sides of
the upper blade holder are in vertical planes, and the
swinging frame members 15 and the lower blade holder
cutting edge 39 of the blade 2t’; severs the metal strip or
supporting arms 37 are in their extreme left or rearward
bar 45 and meets the cutting edge of the lower blade 32
positions. The bearing engagement between the blade
holder side plates 35 and the upper ends of the arms
37 automatically causes the arms to move to the left
when the swinging frame members 15 are moved in that
direction. In this position of the swinging shear frame,
as shown in FIGS. 2 and 5.
The arcuate non-concentric
paths in which the blades travel from “rest” to cutting
positions about the pivots 16 and 49, respectively, is in
dicated in dotted lines in FIG. 8. The combined pivotal
the upper swinging blade unit is tilted slightly from the , and arcuate movements cause the blades to approach each
other while traveling in the direction of the moving strip
vertical due to its engagement with the stop plate 24,
and the blade 26 is spaced from the upper surface of 30 and to produce a clean cut through the moving strip
the traveling strip 4-5 as shown.
FIGS. 2 and 5 show the shearing mechanism at the
completion of the cutting operation. The movement of
the parts from the positions shown in FIGS. 1 and 4 to
those of FIGS. 2 and 5 are produced by actuating a
single element, namely, the swinging shear frame 14
about the shaft 16. This produces a combined pivotal
and arcuate movement of the blade units 25 and 31. The
upper blade unit 25 by gravity seeks its vertical posi
as shown in FIGS. 2 and 5.
The shearing of the strip
takes place as indicated diagrammatically in vFIG. 8 when
the blades 26 and 32 meet.
The strip 45 is constantly
moving, both before and after shearing takes place.
Therefore the advancing edge of the cut strip 45 con
tacts the upper blade 26 when shearing has taken place
and pushes the blade and its holder 27 to the right as
shown in FIG. 9, thereby swinging the upper cutter
unit about its pivot 29, and at the same time the swinging
frame 14 returns to initial position.
tion and moves pivotally about the shaft 29 while said
shaft 29 is carried in an arcuate path concentric with the
shaft 16 by the pivotal movement of the frame arms 15
about said shaft 16. At the same time, the lower blade
unit 31 also moves pivotally about its shaft 3t’) which is
carried in an arcuate path concentric with the shaft 16
In describing the invention, reference has been made
to a particular example embodying the same, but I wish
it to be understood that the invention is not limited to
the construction shown in the drawing and that various
changes may be made in the construction and general
by the pivotal movement of the frame members 15. How
ever, the pivotal movement of the unit 31 about its shaft
36 is controlled by the supporting arms 37 in engage—
tion.
I claim:
arrangement of parts without departing from the inven
1. Metal bar shears for shearing constantly traveling
ment with the side plates 35; as said arms 37 assume the
work comprising a stationary upright support, a recipro
more vertical positions of ‘FIGS. 2 and 5, by moving piv
otally about the shaft 49, the forward portion of the 50 cated swinging frame pivotally connected at its lower
blade holder is raised and the blade 32 moves in an
arcuate path toward the blade 26. The swinging frame
arms 15 are cut away at 46 to accommodate the shaft 40
end to the support, an upper cutter unit, means pivotally
connecting the upper cutter unit to the swinging frame be
tween its ends, said upper cutter unit depending from
said connecting means and having swinging movement
relatively to the frame, a stop member connected to the
frame limiting the rearward swinging movement of the
when the parts are in cutting position.
As shown in FIG. 2, Where the cutting of the work
45 is taking place, the center of the upper cutter unit
upper cutter unit, a lower cutter unit, means pivotally
pivot 29 is located 1A1. inch to the right of a vertical
connecting the lower cutter unit rearwardly of its center
plane through the center of the swinging frame pivot 16
to the swinging frame, a supporting arm having a free
and therefore slightly below the highest portion of its
arcuate path. In a full size machine, which is at least 60 upper end, and means pivotally connecting the lower end
of the supporting arm to the upright support forwardly
?ve times the size shown in the application drawings, a
and upwardly of the lower pivoted end of the swinging
vertical plane through the pivotal center 29 is located
frame, the free upper end of said arm slidably engaging
approximately one and one-quarter inches to the right of
and loosely supporting the lower cutter unit forwardly
the vertical plane through the center of pivot 16 when
of its pivotal connection to the swinging frame, actuation
shearing of work 45 takes place. In that position, in a
of the swinging frame in the direction of travel of the
full size machine, the center of pivot 29 is about %
work automatically imparting pivotal movement to the
inch closer to the work than when the pivots 29 and 16
upper cutter unit, supporting arm and lower cutter unit
are in the same vertical plane. Further, added to this
and thereby swinging the upper cutter unit to vertical
movement of center 29 toward the work as the ‘frame
14 swings to the right, the change in position of the holder 70 position, lifting the lower cutter unit forwardly of its
pivotal connection to the swinging frame, and moving
27 and blade 26 from the inclined position of FIG. 1 to
said cutter units forwardly in arcuate non-concentric
the vertical position of FIG 2 aids in bringing the blade
26 closer to the Work. The forward movement, that is
the swinging movement of the frame 14 in the direction
of travel of the work, at the same time causes the lower
paths toward each other into shearing relationship, said
means pivotally connecting the upper cutter unit to the
swinging frame being located forwardly of the swinging
I
3,038,362
frame pivot and slightly below the highest portion of its
arcuate path during the cutting operation.
oted end of the swinging frame, the free upper ends of
said arms slidably engaging and loosely supporting the
2. The bar shears de?ned by claim 1, in which the
lower cutter unit at each of its sides forwardly of its
upper cutter unit comprises a blade holder, a blade
pivotal connection to the swinging frame, actuation of
mounted in the lower rearward portion of the holder,
the swinging frame in the direction of travel of the
work automatically imparting pivotal movements to the
parallel to and rotatably surrounding the means con
upper cutter unit, supporting arm and lower cutter unit,
necting the upper cutter unit to the swinging frame.
thereby swinging the upper cutter unit to vertical posi
3. The bar shears de?ned by claim 1, in which the
tion, lifting the lower cutter unit forwardly of its piv
supporting arm has a curved peripheral surface on its 10 otal connection to the swinging frame, and moving said
upper free end, and the lower cutter unit has a curved
cutter units forwardly in arcuate non-concentric paths
surface slidably and loosely engaged by said free end
toward each other into shearing relationship, said means
of the arm.
pivotally connecting the upper cutter unit to the swinging
4. Metal bar shears for shearing constantly traveling
frame being located forwardly of the swinging frame
work comprising stationary spaced apart upright supports, 15 pivot and slightly below the highest portion of its arcuate
and a tubular member on the upper end of the holder
a reciprocated swinging frame including parallel spaced
path during the cutting operation.
frame members each pivotally connected at its lower end
to one of the upright supports, a cross piece connecting
References Cited in the ?le of this patent
the frame members, an upper cutter unit extending hori
UNITED STATES PATENTS
zontally between the frame members, means pivotally 20
897,344
Bray et a1. ____________ __ Sept. 1, 1908
connecting the upper cutter unit to the swinging frame
1,507,703
Kennedy ____________ __ Sept. 9, 1924
between its ends, said upper cutter unit depending from
2,123,570
Lehmann ____________ __ July 12, 1938
said connecting means and having swinging movement
2,415,325
Wood _______________ __ Feb. 4, 1947
relatively to the frame, a stop member connected to
Henschker ___________ __ Feb. 24, 1948
the frame limiting the rearward swinging movement of 25 2,436,572
2,588,663
Sc-hane ______________ .. Mar. 11, 1952
the upper cutter unit, a lower cutter unit, means piv
otally connecting the lower cutter unit rearwardly of its
center to the swinging frame, a pair of supporting arms
each having a free upper end, and means pivotally con
necting the lower ends of the supporting arms to the up
right support forwardly and upwardly of the lower piv 30
FOREIGN PATENTS
575,812
Germany ____________ __ May 2, 1933
711,757
Germany _____________ __ Oct. 6, 1941
889,549
France ______________ __ Jan. 12, 1944
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