close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3082807

код для вставки
March 26,~_ 1963
s. A., PLATT
3,032,797
METHQD AND APPARATUS FOR BENDING WIRE
Filed Nov. 7. 1958
'7 Sheets-Sheet 1
i
EL»
I
m
m
|
‘r\
-T— 2
F1
"’\
= -
|
'1
g
’
f
8
N\
‘°\
Ali
"<3
H
5
'5
*
omy
1
INVENTOR.
STEPHEN A. PLATT
54
L
BY
OM‘ M
March 26, 1963
s. A. PLATT
3,082,797
METHOD AND APPARATUS FOR BENDING WIRE
Filed Nov. 7, 1958
v
7 Sheets-Sheet 2
E;E_E_
i
INVENTOR.
STEPHEN A. PLATT
BY
ATTORNEYS
March 26, 1963
‘
Filed Nov. 7, 1958
‘
s. A. PLATT
3,032,797
METHOD AND APPARATUS FOR BENDING WIRE
'7 Sheets-Sheet 3
2515-3
INVENTOR.
STEPHEN A. PLATT
$116)”
A TTORNE Y5‘
March 26, 1963
3,082,797
s. A. PLATT
METHOD AND APPARATUS FOR BENDING WIRE
Filed NOV. 7, 1958
7 Sheets-Sheet 4
m.aElnm u
&
INVENTOR.
STEPHEN A. PLATT
BY
March 26, 1963
s. A. PLATT
3,082,797
METHOD AND APPARATUS FOR BENDING WIRE
Filed Nov. 7, 1958
7 Sheets-Sheet 6
"
INVENTOR.
STEPHEN A. PLATT
5O
BY
A T TORNE Y5‘
March 25, 1963
s. A. PLATT
3,082,797
METHOD AND APPARATUS FOR BENDING WIRE
Filed Nov. 7, 1958
7 Sheets-Sheet '7
' \wér‘m:
INVENTOR.
50
STEPHEN
BY
. PLA
M
ATTORNEYS
7'
1
answer
United States Patent 0 "ice
Patented Mar. 26, 1&53
2
ing the maximum amount of wire per unit area of
3,082,797
lfvlETHOD AND APPARATUS FQR BENDING WIRE
§tephen A. Piatt, 1169 Fulton St, Grand Haven, Mich.
Fiied Nov. '7, 1958, Sea‘. No. 772,433
4 @iairns. (Cl. 140-71)
This invention relates to ways and means for bending
wire. More particularly, it relates to a method and ap
paratus for bending wire to be used as electrical resis
tance, heating elements and the like.
Sinusoidally bent, wire resistance elements are used
in a number of appliances, such as heating pads, grills
and the like.
Consequently, there is a demand for
element.
,
Another speci?c object of this invention is to provide
an apparatus for continuously and controllably bending
resistance wire into an element having the maximum
amount of wire per unit area of element.
These and other objects which may appear as this
speci?cation proceeds are achieved by this invention
which shall be described in the context of the drawings
wherein:
FIG. 1 is a front elevation of a preferred embodiment
of the machine of this invention;
FIG. 2 is an enlarged, front, elevational view of a
portion of the apparatus of FIG. 1 with a portion of
sinusoidally bent resistance wire and machines have been
developed to bend wire to supply this demand. An ex 15 the apparatus broken away to reveal interior structure;
FIG. 3 is a partial, side elevation view taken along the
ample of such a machine is described in US. Patent No.
lines III—III of FIG. 1 with portions of the supporting
2,456,353 to Wolf, et al.
structure of the apparatus broken away to reveal internal
The machines heretofore developed have a disadvan
structure;
tage however, in that for a given width of resistance wire
FIG. 4 is a fragmentary, sectional, partially broken
element produced thereby the amount of wire per unit
plan view of the apparatus taken along the lines IV—IV
ength of element is less than that desired. In short, the
amount of wire per unit area of element is unduly limited.
These machines bend the resistance wire in substantially
of FIG. 1;
per unit area of wire element and from economiciand en
of HG. 1.
'
FIG. 4a is an enlarged, plan view of the mandrels
shown in FIG. 4;
perfect sine waves. Even the most e?icient of these ma
FIG. 5 is a sectional, plan view taken along the lines
chines cannot form the wire closer than with parallel 25
V—V of PEG. 2 and showing a portion of the bent wire
traverse wires or bars. Because the minimum radius
travel resist means of the apparatus of FIG. 1;
of bend of resistance wire is limited by the physical
FIG. 6 is a plan view of the apparatus of FIG. 1 which
properties of the wire, once the minimum bending radius
view has been somewhat reduced in size; and
has been reached, the quantum of wire per unit area of
FIGS. 7-14 are diagrammatic views illustrating pro
element cannot be increased in the case of such machines
gressively the relative movements of the wire feeding head
without damaging the wire. On the other hand, the de
and mandrels during one operative cycle of the apparatus
mand of the art is for an increased thermal output per
In general, the drawings show that a basic concept of
resistance wire element calls for an increase in the 35 this invention is bending the wire so that it back tracks
or doubles back against itself in a plane with the result
amount of wire per unit area of element. This the prior
gineering considerations, the optimum design of a bent
art machines are incapable of delivering.
'
The machines heretofore developed produce sinuated
element with substantially parallel bars, whether the re
turn bends be very small or very large. Where the
sinuated element can be taken direct from the machine
and fabricated into its ?nal sheath without intermediate
that the marginal terminal loops are partially overlapped
laterally of the Wire.
In terms of method, the drawings broadly disclose the
steps of pushing wire under tension in a direction of
travel while simultaneously in a plane looping the wire
transversely to a line in said direction; ?rst to one side
of said line and then to the other side of said line, and
resisting movement of looped wire in said direction of
?nished element in continuous lengths on large reels, in 45 travel. The adjacent loops of the bent wire elements
thus formed will usually be in contact with one another
large quantity, between machine and assembly lines.
and, unless this condition is corrected, will short circuit
This calls for sinuated element with its turns touching
the oppositely disposed loops under use conditions. Con
each other to prevent interlacing of one element with
sequently, while not shown, the method of this inven
another when they slip on each other, or when one ele
tion comprises the step of separating (or breaking con
ment falls next to another on the production table.
handling, no trouble is experienced.
However, large
volume manufacture has made it necessary .to store
Another problem that had to be met was that of
crowding all the bars of sinuation per running inch or
tact of) adjacent loops.
and means for producing ?at sinuated wire elements
wherein the amount of resistance wire per unit area of
a plane said wire transversely to a line in said direction,
?rst to one side of said line and then to the other side of
said line, and, means for resisting movement of the looped
wire in its direction of travel. The sinuating mechanism
has a wire feeding head adapted to travel in a ?gure 8
shaped path in a plane. The mechanism also has a pair
in terms of apparatus, the drawings broadly disclose a
machine for continuously forming bent resistance wire
foot possible, both for maximum storage per given reel
which comprises means for pushing wire under tension in
and for anti-tangling characteristics.
A general object of this invention is to develop ways 55 a direction of travel, means for simultaneously looping in
element :is increased. More particularly, it is an object
of this invention to provide ways and means for bending
resistance wire wherein the only inherent limitation is
that of the wire itself, namely, the minimum bending
radius that the wire can withstand without fracturing or
of reciprocable mandrels oppositely disposed on each side
of said line of travel and adapted to move into and out
of said plane in coordination with the movement of the
Another object of this invention is a machine which
produces the required element form. Extremes are 65 Write‘ feeding head. Each mandrel is adapted to move
oppositely to the other and to come between the wire and
now required in industry ranging from bends as short
the wire feeding head as said wire feeding head reverses
as one wire diameter up to 1A; inch radius. It will be
its movement parallel to the direction of trvael of the
seen why physical handling of such requires turns to
?nished wire, and to withdraw from said plane as said
be touching until just prior to stretching into sheath as
70 wire feeding head moves towards it. The movement of
sembly.
cracking.
A speci?c object of this invention is to provide a
method for bending resistance wire into an element hav
the feeding head in wrapping the wire around each of the
mandrels pushes the sinuated or looped wire through the
8,082,797
3
machine. This produces the tight loop formation char—
acteristic of the product of this machine.
A.
The drive rod 38 in conjunction with the rocker arms
49 and 44, the cam follower assembly 50 and the spring
57, functions to impart reciprocating backward and for
Structure
ward motion to the wire feeder means 28.
In somewhat greater detail, it will be observed that the
Transverse motion of the wire feeder means 28 is ob
drawings illustrate a wire bending apparatus 20 into which
tained by transverse motion assembly comprising a pitman
resistance wire 21 under tension is fed and out of which
60 (FIG. .6), one end of which is pivotally secured to the
a continuous, looped wire 22 emerges (FIG. 4.) The
bottom plate 29 of the feeder means 28 as by a shaft pin
apparatus comprises a stationary table 23 having a ?at,
61. The other end of the pitrnan 60 has a head block 62.
horizontal top surface. A pair of wire bending posts or 10 The head block 62 is secured to an anchor plate 65- as by
mandrels 24 and 26 extend vertically and movably
the bolt 63 and nut 67. The anchor plate 65 is seated
through the table in slots 25 and 27, respectively. It will
in the channel 64 of the disk cam 50 for radial adjustment
be observed that the mandrels 24 and 26 are oppositely
and detachably secured by the set screws 66.
disposed and are adapted by means to be later described
Each of the vertically movable mandrels 24 and 26
herein to reciprocate oppositely and vertically from a po 15 functions
as wire bending posts. The portions thereof
sition ?ush with, or below, the top surface of said table
which
rise
above the plane of the top surface of the table
23 to a position above the plane of said surface. (The line
23 are provided with outer lateral, curved, wire bending
or direction of travel of wire through the machine is nor
surfaces 24a and 26a (FIG. 4a) each of which has a ra
mal to a line between these mandrels 24 and 26.
dius
of revolution corresponding to the desired radius of
Adjacent the table 23 and opposite said reciprocable 20 curvature
of the loops of the sinuated wire product. In
mandrels is a movable wire feeding means or head 28
general, this radius is selected to correspond to the mini
comprising a horizontally disposed bottom plate 29, the
mum radius at which the particular Wire being sinuated
top ‘surface of which is disposed in the same plane as that
can be bent Wtihout rupture. The axis of each surface
of the top surface of the table 23 (FIGS. 4 and 6). Ad
runs longitudinally through the corresponding mandrel.
jacent the top of bottom plate 29 and facing one another
is a pair of curved guide surfaces formed by the circum
ferential periphery of a horizontally disposed, preferably
rotatable, disk 36 on an axial shaft 31 and by the circum
Each of the vertically movable mandrels 24 and 25 is
driven by a spring and cam assembly (FIGS. 2 and 3).
Thus, with reference to the right hand mandrel 24 the
bottom end thereof is associated with a cam follower 69,
a pivot bar 107 rotatably secured to a stationary shaft
erably rotatable, disk 32 on an axial shaft 33. The ad 30
103
mounted in the stationary support structure 58 and
jacent portions of the guide surfaces are spaced apart a
a compression spring 68 attached to the overhead portion
distance slightly more than the outside diameter of the
of the structure 58. Similarly, the bottom end of the
wire 21. Above and adjacent to said guide surfaces is
left hand mandrel ‘26 is associated with a cam follower
a retention plate 34 attached to said bottom plate 29 as
71, a pivot bar 109 rotatably secured to the shaft 108
by screws 35.
35 and a compression spring 70 attached to the overhead por
Below and attached as by rivets to said bottom plate is
tion of the supporting structure 58. Both cam followers
a horizontally disposed guide plate 47 (FIG. 3). The
ride on a rotatable, horizontal radial cam 72. The cam
front portion of the bottom plate (with reference to direc
72 is mounted on and rotated by the rotatable shaft 75.
tion of travel of the unbent wire 21) is slidable in a trans~
The cam 72 has two adjacent cam surfaces, each of which
versely arranged track 49 between a stationary front sup‘
has a constant radius for about 270° and a larger radius
port block 36 and a retaining plate 37 attached to the
for about 90° about the axis of the cam whereby each cam
block. The back portion of said guide plate (again with
surface comprises a lower peripheral portion 73 and a
reference to the direction of travel of the unbent wire 21)
raised
peripheral portion 74. The raised portion of the
curves downwardly in sliding engagement with a movable
one cam surface is disposed 180° about the cam axis
drive rod 38. Secured to the underside of said guide
from the raised portion of the second cam surface and
plate 47 is one flange of an angle iron 39. The other
the radius of each raised cam surface is sufficient to pro
?ange of the angle iron 39 is in sliding contact with said
ferential periphery of another horizontally disposed, pref
drive rod 38 and in conjunction with the curved portion
of the guide plate maintains the wire feeder 28 in position
on said drive rod.
1
=
i
The drive rod 38 is pivotally secured to the ends of a
pair of rocker arms 40 and 44 by pins 41 and 45, respec
tively (FIG. 6). The other ends of the rocker arms 40
and 44 are pivotally attached to the front support block
36 by pins 42 and 46 respectively. The rocker arms 40
and 44 are spaced axially of the rod 38. Both rocker
arms, it will ‘be noted, lie in the same plane and are trans
versely disposed to both the stationary front block and
ject the respective mandrels 24 and 26 above the plane
of the top surface of the table 23 when said cam sur
faces contact the respective cam follower members of the
mandrels 24 and 26. The bias of the springs 68 and
70 toward the cam 72 assures that the cam followers 69
and 70 will be in constant contact with the respective cam
surfaces.
The drive shaft 75 associated with the radial cam 72 is
connected to the gear box 76. By means of the gear
‘box '76 it also drives the disk cam 50, thus synchronizing
the operation of said mandrels 24 and 26 and the cam 50.
The drive shaft 75 is driven from a prime mover (not
the direction of travel of said unbent wire 21 through the
shown) ‘by means of the pulley 77.
apparatus.
60
Under operative conditions the wire feeder means 28
At the right hand end of the drive rod 38 there is
makes substantially a transverse ?gure 8 motion. Ac
mounted in the horizontal plane a roller follower assem
cordingly, the mandrels 24 and 26 are centered in and
bly 48 with the axis of the roller being vertically disposed.
forgn
the ends of the loops in the wire as the wire is sinu
The roller is shown in contact with the periphery of a disk
ate .
cam 50 mounted on an axial shaft 51 the axis of which is
likewise vertically disposed. The periphery of the disk
cam 50 comprises a pair of removable cam follower tracks
52 and 54 which have inwardly curved leading and trail
ing edges.
.
The means for resisting movement of looped Wire in
the direction of travel thereof comprises an assembly 80
situated above the table 23 behind the mandrels (FIG.
2). This assembly comprises an inverted U-shaped frame
At the right hand end of the drive rod 38 there is at 70 81 which carries a set of rubber disks 82 rotatable on a
shaft 83. The shaft 83 is arranged transversely to the
tached a spring post 56 (FIGS. 1 and 3). The post 56
direction
of wire travel and inserted into an aperture in
mounts one end of a helical, tension spring 57. The other
each of the depending legs of the frame 81. The rub
end of the spring 57 is attached to the stationary support
ber wheels are secured axially of the shaft 83 by a pair of
structure 53 of the machine and biases the drive rod
toward the disk cam 56.
clamping bars 84. The clamping bars are axially adjust
able along the shaft 83 to regulate the degree of resistance
3,082,797‘
5
6
to rotation as a group or with respect to each other.
sistance of the disks 82 whereby the back track in the
They are clamped to an upper horizontally disposed sus
pension rod 85 by thumbscrews 86. The ends of the sus
pension rod are mounted to the depending legs of the
frame 81. The cross arm 87 of the frame 81, disposed
under, and adjacent to, a crossbar member '88 has a pair
looped wire is retained and in some cases may even be
of upstanding guide pins 89 passing through the arcuate
increased.
The coordination of these movements may be seen in
the context of FIGS. 7—l4. Thus, as shown in FIG. 7,
as the wire feeder means 28 moves left from its extreme
right hand position, the incoming wire 21 is positioned
behind the elevated, right hand mandrel 24. As the wire
guide pin slots 90 in the crossbar member 88 ('FIG. 5).
feeder means 28 continues its travel to the left, the in
The crossbar has a thumbscrew assembly 91 for adjusting
and setting the angular position of the frame 81 with rela 10 coming wire 21 is drawn ?rmly about the right hand
mandrel 24 by the tension applied to the wire as it is
tion to the work traveling under the rubber wheels 82.
“The crossbar 88 is joined as by machine screws to the
depending arms of vertically movable yoke 93, the cross
bar of which is threadedly suspended on a vertically dis
posed adjustment stud 95. The upper end of the adjust
ment stud 95 passes through an overhead support frame
94, anchored to said bed block 23. A lock nut 96 thread
edly attached to said thumbscrew 95 is disposed adjacent
to and on top of the crossarrn of the upper U-bar 93.
The preferred embodiment of this invention also has a
spring adjustment assembly for the drive rod 38 (FIG.
‘6). This assembly has a horizontally disposed shim
‘fed to the wire feeder 28.
When the wire has been
?rmly wrapped about the mandrel 24, the left hand
mandrel 26 withdraws to the top surface of the table 23
as in FIG. 8. As the right hand wiping disk 30 moves
past the mandrel 24, it wipes the wire ?rmly against the
surface of revolution of the mandrel, producing a loop
having a radius corresponding exactly to that of the sur
face of revolution.
As its leftward movement continues, the feeder 28
moves also toward the direction of travel (backward) as
in FIG. 9, thereby leading the wire behind the lowered
left hand mandrel 26 and pushing the previously formed
loop in the direction of travel. As the wire feeding
bar 97, one end of which is interposed between the spring
post 56 of the drive rod and the edge of .the bed block
23. The bias of the spring 57 causes the spring post to 25 means 28 approaches the leftward limit of its travel, it
commences to move forwardly and the left hand wire
bear against the shim bar 97 when the rod 48 is at rest.
mandrel 26 elevates above the level of the table 23 and
A short distance from said end and on the rocker arm
blocks forward movement of the left hand portion of the
side of said shim bar, the bar is in contact with an arcuate
wire, as in FIG. 10. Upon reaching the left hand limit
fulcrum 98. The other end of the shim bar 97 is biased
of its travel, the feeder means 28 starts to move toward
away from the bed block 23 by a spring 100. Byreason
the right hand side of the line of travel whereupon the
of position of the fulcrum 98, the shim is urged against
incoming wire 21 is engaged by the guide surface 32 and
the spring post. The end of the shim bar 97, biased out
is led along therewith in the right hand direction, there
wardly by the spring 100, is urged inwardly against the
by
forming a tight loop about the post 26, as in FIG. 11.
spring by a thumbscrew 1G1 threadedly passing through
As the feeder means continues its rightward movement,
an aperture in the vertical ?ange of an angle iron 102 (at
the right hand mandrel 24 withdraws to the level of the
tached to the bed block 23). To assure retention of set
table 23 as in FIG. 12, and the wire feeder 28 moves
ting, the thumbscrew has a lock nut 103. By adjustment
rearwardly as in FIG. 13, pushing the preceding loop out
of the thumbscrew the axial travel of the rod '38 and there
of the way and leading the wire 21 behind the lowered
by the fore and aft movement of the feeding head 28 may
mandrel 24. As the wire feeder 28 completes its travel
40
be controlled.
to the right, the right hand mandrel 24 again rises above
Also included may be means for manually moving the
the level of the table 23 and the feeder 28 moves for
wire feeder means 28 to facilitate threading wire through
wardly. As can be seen, the movement of the wire feed
the machine at start-up.
ing means 28 in a continuous ?gure 8 motion in re
It may also ‘be observed that the underside of the disk
cam 50 is associated with a belt drive pulley 104 (FIG.
1) which is also keyed to the drive shaft 51. Under op
erative conditions this pulley may be used to drive the
sinuated wire wind-up reel.
Other auxiliary structural features may also be pro
vided, such as, for example, as shown in FIG. 6, a pair
lationship to the continuous elevation and withdrawal
movement of the mandrels 24 and 26 results in forma
tion of tight wire loops.
The bent wire element 22 thus formed is pushed by the
action of the wire feeder means 28 under the rubber
wheels 82 of the movement resistance assembly 80. The
various thumbscrews of this assembly are adjusted to pro
of oppositely disposed, adjustable guide plates 106 which
vide su?icient bearing and thus resistance to forward
function to guide the looped wire 22 from the machine.
travel of element 22. This causes adjacent loops to come
They also resist movement of said looped wire 22 from
together as they are pushed rearwardly without decreas
the mandrels.
ing the radius of the loops below the critical minimum at
55 which fracturing occurs.
Operation
The width W (FIG. 4) of the bent wire elements 22
can be adjusted by changing the length of the stroke of the
Under operative conditions resistance wire 21, as from
transverse motion drive rod 60. This can be accom
a supply reel 116 (FIG. 4), passes through a wire ten
plished by loosening the lock nut on the shaft 63 and slid
sioning apparatus 112. The wire tensioning apparatus
ing the same between the retaining plates 65 toward the
112 is a conventional device and is therefore not described
drive shaft 51 to decrease the width and away from the
herein. The apparatus 112 functions to establish and
drive shaft to increase the width. The spacing of the
maintain the wire 21 at a constant and uniform tension
mandrels 24 and 26 is correspondingly adjusted.
as it is pulled into the machine 2%.
The radius of each loop can be adjusted by substituting
In the machine 26 the wire 21 is pulled into the wire
thicker or thinner mandrels 24 and 26 and thus a larger
feeding head 28 between the guide surfaces 30 and 32 by
or smaller radius about which the wire is formed. The
the movement of the head 28. The feeding head 28
removable follower tracks 52 and 54 can be changed
moves in the plane of said table 23 top surface in a
to ones of increased radial thickness for larger loops
?gure 8 path transversely to the direction of travel of
and to ones of decreased radial thickness for smaller
said wire 21 while the mandrels 24 and 26 alternately
rise above and withdraw to at least said plane. The move 70 loops. The angle of the frame 81 in relation to the
sinuated wire is set to cause the sinuated wire to move
ment of the feeding means and the mandrels 24 and 26
rearwardly in a straight line rather than curving to either
are so coordinated that wire emerging from said feeding
side.
head is continuously looped around the mandrels, ?rst
The concepts of this invention have a number of ad
on one side and then on the other, and previously formed
loops are pushed in the direction of travel against the re 75 vantages. In the ?rst place, resistance Wire elements pro—
3,082,797
7
duced according to the teachings hereof have almost
twice as much wire per unit length for a given width of
element. Second, uniform and consistent loops are
made. Third, the only limiting factor in the curvature
of the loops is the wire itself, the radius at which the wire
cracks or fractures.
Fourth, the curvatures are con
sistently accurate. Finally, the machine embodiment of
8
2. An apparatus as recited in claim 1 wherein said
rubber-like wheel consists of a plurality of separate disk
like members arranged in side-by-side relationship along
said axis; said disk-like members each being rotatable
with respect to the others to provide a limited differential
action for said resisting means.
3. An apparatus as recited in claim 1 wherein said wirc
forming means has a head member; a pair of disks ro
this invention can be readily adjusted to different pro
duction requirements with a minimum of effort.
tatably mounted on said head member, said disks being
Pushing the formed wire away from the mandrels 24 10 rotatable about axes normal to said plane of said band
and 26 produces the tightest possible loop con?guration
and spaced apart only su?iciently to form a passage for
with the loops along opposite sides being arranged in par
movement of wire therebetween; a guide supporting said
tially overlapping relationship rather than spaced alter
head for reciprocating movement laterally of said band;
nate relationship. It is this that attains the objective of
driving means secured to said guide for shifting said
packing more resistance into a unit area of formed wire
guide and said head parallel to the direction of movement
than was heretofore possible. This overlapping arrange
of said band.
ment must be effected in the initial sinuation of the wire.
4. An apparatus for continuously forming a wide, ?at,
It cannot be accomplished by attempting to close the loops
once they have been formed in an open con?guration.
Other features, advantages and embodiments of this
invention will become apparent to those in the exercise of
ordinary skill in the art in light of the preceding descrip
tion. Therefore, it should be noted that as this inven
tion may be embodied in several forms without depart
elongated band of looped resistance wire, which com
prises: Wire forming means for pulling wire under constant
and uniform tension from a source; said wire forming
means simultaneously forming loops in said wire with said
loops lying in a flat plane and constituting said band, said
loops extending transversely of and being alternately ar
ranged with respect to the longitudinal center line of
ing from the spirit thereof, the present embodiment is 25 said band and the closed ends thereof forming the
therefore illustrative and not restrictive, since the scope
of the invention is defined by the appended claims and
all changes that fall within the metes and bounds of the
margins of said band, said wire forming means also mov
1. An apparatus for continuously forming a wide, ?at,
elongated band of looped resistance wire, which com
sliding reciprocating movement laterally of said band;
driving means secured to said guide for shifting said guide
ing said band away from said source; said wire forming
means having a head member; a pair of disks rotatably
claims or that form their functional as well as conjointly
mounted on said head member, said disks being rotatable
cooperative equivalents are therefore intended to be em
30 about axes normal to said plane of said band and spaced
braced by those claims.
‘apart only sufficiently to form a passage for movement
I claim:
of wire therebetween; a guide supporting said head for
prises: wire forming means for pulling wire under con
35 and said head parallel to the direction of movement of
stant and uniform tension from a source; said wire form
said band; and means for resisting movement of said
ing means simultaneously forming loops in said wire with
band away from said wire forming means.
said loops lying in a ?at plane and constituting said band,
said loops extending transversely of and being alternately
arranged with respect to the longitudinal center line of 40
said band and the closed ends thereof forming the margins
of said band, said wire forming means also moving said
band away from said source; and means for resisting
movement of said band away from said source and said
wire forming means for urging the loops at the margins 45
of said band into abutting relationship; said resisting
means having a rubber-like wheel rotatably supported
for rotation about an axis extending generally parallel
to said loops of said band; a support for said resisting
means, said resisting means being movable on said sup 50
port toward and away from said band and angularly vari
able with relation to the direction of movement of said
band.
References Cited in the ?le of this patent
UNITED STATES PATENTS
905,130
1,273,020
1,439,411
2,047,717
2,061,579
2,188,407
2,709,462
2,747,619
2,898,949
Ayer ________________ __ Dec. 1, 1908
Winsor ______________ __ July 16, 1918
Griner ______________ __ Dec. 19, 1922
Van Dresser et a1 _______ __ July 14,
Huyett ______________ __ Nov. 24,
Horton ______________ __ Jan. 30,
Schade ______________ __ May 31,
Buttner ______________ __ May 29,
Huszar ______________ __ Aug. 11,
1936
1936
1940
1955
1956
1959
Документ
Категория
Без категории
Просмотров
0
Размер файла
977 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа