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Патент USA US3098629

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July 23, 1963
3,098,624
S. s. DE FOREST
APPARATUS FOR STRINGING AND TENSIONING
PLURAL STRANDS OF FENCE WIRE
Filed Feb. 8, 1961
5 Sheets-Sheet 1
INVENTOR.
SHERWOOD 5. MIL-“@557
ATTORNEY
July 23, 1963
s. 5. DE FOREST
3,093,624
APPARATUS FOR STRINGING AND TENSIONING
PLURAL STRANDS OF FENCE WIRE
Filed Feb. 8, 1961
5 Sheets-Sheet 2
INVENTOR.
SHERWOOD 5. 051702557
ATTOQ/VEV
July 23, 1963
s. s. DE FOREST
APPARATUS FOR STRINGING AND TENSIONING
PLURAL STRANDS OF FENCE WIRE
Filed Feb. 8, 1961
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3,093,624
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5 Sheets-Sheet I5
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INVEN TOR.
mean/00a .s. 05 F0957
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July 23, 1963
s‘ 5. DE FOREST
APPARATUS FOR STRINGING AND TENSIONING
PLURAL. STRANDS OF FENCE WIRE
Filed Feb. 8, 1961
3,098,624
5 Sheets-Sheet 4
IN VEN TOR.
SHERWOOD 5. 051502557"
BY
47'7ORA/EY
July 23, 1963
s 5. DE FOREST
APPARATUS FéR STRINGING AND TENSIONING
3,098,624
PLURAL STRANDS OF FENCE WIRE
Filed Feb. 8, 1961
5 Sheets-Sheet 5
INVEN TOR.
JHAFQWOOD 6. Q5 FOP£57
BY
W
ATTORNEY
c
3,098,624
Patented July 23, 1963
2
3,098,624
APPARATUS FGR
GING AND TENSIONE‘IG
PLURAL SNDS 0F FENCE WIRE
Sherwood S. De Forest, Coraopolis, Pan, assignor to
United States Steel Corporation, a corporation of New
Jersey
Filed Feb. 8, 1961, Ser. No. 87,333
12 Claims. (Cl. 242-867)
vertical reel 4 for dispensing woven wire fencing from a
coil thereon and a tensioning clamp 5, which form the
subject matter of copending application Serial No. 83,706,
?led January 19, 1961, and to which reference is made
for a more detailed explanation and showing thereof, are
mounted on the carriage 1 together with the dispensing
mechanism 6 of this invention. In operation, the dis
pensing mechanism 6 and vertical reel 4 operate to string
fence wire, designated diagrammatically by the broken
This invention relates to wire fence of the type that is 10 line 7, along the line of fence posts 2 as the carriage 1
formed of plural strands of fence wire strung along a line
is pulled forwardly by the tractor 3. After being placed
,of fence posts. As indicated, it relates more particularly
under tension, the wire 7 is fastened to the fence posts 2.
to an apparatus for simultaneously stringing plural strands
A fence post driver 8, the mounting of which forms the
of fence wire under the tension required for fastening to
subject matter of copending application Serial No. 86,422,
the fence posts.
15 ?led February 1, 1961, at the forward end of the carriage
1 is operated to install fence posts 2 at spaced intervals
The apparatus of this invention, more speci?cally, com
prises a plurality of dispensing reels for coils of fence
along the fence line. As indicated, this invention is
‘wire, such as barbed wire and the like, from which the
directed to the mechanism 6, which in a manner to be
strands are dispensed in ‘being strung along a line of fence
described operates to string plural strands of fence wire
posts, and a tensioning mechanism that operates to resist
under tension along the fence posts 2.
As shown in FIGURE 2 of the drawings, the carriage 1
the dispensing movement of the strands from said reels
comprises a pair of laterally spaced platforms 9 and 10
‘and thus place them under tension. The fence Wire dis
pensing reels are mounted on a tractor-drawn carriage in
that have pivotal connections 11 at their forward ends to
such manner that the strands of wire are pulled therefrom
a draft bar 12. The connection of the draft bar 12 with
as the carriage is drawn forwardly along a line of fence
the tractor 3 comprises a conventional three-point tractor
hitch which includes a pair of lift links 13 and a stabiliz
‘posts. The tensioning mechanism, in a manner to be
‘described, comprises a frictional ‘braking unit also mount
ing link 14 (FIGURE 3). The lift links 13 are pivotally
ed on the carriage that includes a plurality of tensioning
connected to lugs 15 on the draft bar 12, and the stabiliz
ing link 14 has a pivotal connection 16 to the upper end
discs, which through separate mechanical drives are ro
tated at speeds corresponding to the rates at which the
of a frame 17 that is mounted on the draft bar 12. When
fence wire strands are being strung and which have their
attached to a tractor, the links 13 and 14 furnish a sup
vrotation subject to a retarding torque that is applied by
port for the forward end of the carriage 1 which is sup
‘frictional brake elements. The tensioning discs thus place
ported at its other end for rolling movement over the
ground by casters 18 at the trailing ends of each of the
each of the fence wire strands being strung under a ten
sion that is determined by the frictional braking torque
platforms 9 and 10. When disconnected from the tractor,
the forward end of the carriage 1 is supported by detach~
resisting their rotation. Since the tensioning mechanism
able casters 19 which have upwardly extending stems 20
places each of the strands under equal tension, the vertical
spacing between adjacent strands is maintained uniform
that are removably secured in ‘brackets 21 secured to the
and the strands are thus strung in parallel positions.
draft bar 12.
Other objects ‘and advantages of the invention will
The fence post driver 8 has a central location on the
become apparent from the following description and ac
draft bar 12 and is arranged in the space 22 between the
companying drawings, in which:
platforms 9 and 10. The platform 9 furnishes a support
FIGURE 1 is a diagrammatic plan view of the fence
for ‘both the vertical reel 4 and the tensioning clamp 5
erecting machine to which the apparatus of this invention
mentioned above, and the dispensing mechanism 6 of this
invention, which comprises a plurality of horizontal reels
relates and forms a part thereof;
24 that are adapted to dispense plural strands of fence
FIGURE 2 is an enlarged plan view of the machine
wire, such as ‘barbed wire, ‘from coils supported thereon.
shown in FIGURE 1;
FIGURE 3 is an elevational view looking from the
The fence wire 7, with reference to FIGURE 1, is attached
to one of the fence posts 2 and is dispensed from the reels
right of FIGURE 1;
FIGURE 4 is an enlarged elevational view taken in a 50 4 or 24 upon forward movement of the carriage 1 along
direction looking from the left of FIGURE 2 which-shows
a line of fence posts by the tractor 3‘. As described in
the plural wire strand stringing and tensioning apparatus
the above mentioned copending application Serial No.
83,706, woven fence wire 7 being dispensed from the ver
of this'invention;
=
FIGURE 5 is an end elevational view of a portion of
tical reel 4 travels through a vertical pass between ten
the apparatus shown in FIGURE 4 taken in a direction 55 sioning clamping elements 25 and 26 that form part of
the tensioning clamp 5 and are operated into clamping
looking from the right thereof;
FIGURE 6 is an enlarged elevational view of one of
engagement with the fence wire 7 so that subsequent for
ward movement of carriage 1 will operate to apply ten
the fence wire strand dispensing reels of this invention;
FIGURE 7 is an elevational view of the braking unit
sion to the wire 7 prior to its being fastened to the posts 2
shown ‘in FIGURE 1 which illustrates the manner in 60 along which it has been strung. The horizontal reels 24
which it is mounted on a supporting frame therefor; and
in accordance with the present invention are provided
FIGURE 8 is an exploded view showing the parts of
with chain and sprocket drives to a tensioning unit 27
the braking unit shown in FIGURE 7, in which portions
that operates to apply tension to plural strands of fence
of such parts are broken away and shown in section.
wire being dispensed from the reels 24 independently of
The apparatus of this invention forms ‘part of a fence 65 the tensioning clamp 6.
building machine that has as its principal purpose the
The platform It? in operation furnishes a support for
reduction of manual labor required for erecting farm and
carrying a plurality of fence posts and, for this purpose,
highway fencing. Such machine, as diagrammatically
has vertically extending members 28 and 29‘ at opposite
shown in FIGURE 1, comprises a carriage 1 that is pulled
ends thereof between which the ends of the fence posts 2
forwardly along a line of fence posts 2 by a tractor 3, the 70 are received to hold them in position on the platform 10.
In addition, the platform It} furnishes a stand for a work
carriage being connected with the tractor by a conven
man operating the machine.
tional three-point hitch in a manner to be described. A
8,098,624
3
Since the fence post driver 8 is conventional, it will be
su?icient to indicate that it includes a fence post driving
element 30 that is mounted for guided vertical movement
in a guidehousing 31 carried by the frame 17. Upon re
lease from the position shown in FIGURE 3, the element
30 gravitates downwardly to drive a post positioned there
below into the ground and is thereafter returned to its
elevated position for another post driving operation by a
mechanical drive 32 operated from a conventional tractor
4
ation support the strands of fence wire in vertically spaced
positions and guide the stringing movement of such strands
along parallel paths in a common vertical plane. From
the sheaves 48, the strands of fence wire extend rear
wardly as indicated by the broken line 7 in FIGURE 1 to
a position where they are anchored to the fence posts 2
so that forward movement of the carriage 1 by the tractor
3 will result in the strands being pulled from coils of
fence wire on the reels 24 as the carriage 1 is moved
power take-off (not shown). After driving each fence 10 along the line of fence posts.
post in this manner, the carriage 1 is moved forwardly to
Each of the reels 24 has an identical construction and
the position at which the next fence post 2 is to be driven.
mounting on one of the side bars 41 as best shown in
The central location of the post driver 8 on the draft bar
FIGURE 6. With reference to FIGURE 6, each reel 24
12 and the space 22 between the platforms 9 and 19 pro
comprises a pair of end members 52 land 53 and a stem 54
vide for free forward movement of the carriage 4 to the 15 extending axially therebetween on which a coil of fence
next fence post driving position after each operation of
wire is supported. The stem 54 comprises a hollow pipe
the driver 7 to install a fence post. As described in appli
55 that is secured centrally of the end member 52 and ex
cation Serial No. 86,422, mentioned above, the mounting
tends outwardly therefrom and a plurality of coil support
of the post driver housing ‘31 on the frame 1'7 includes a
ing bars 56 secured to the end member 52 in axially ex
bearing 33 that provides for its rotation about an axis ex 20 tending and circumferentially spaced positions about the
tending transversely of the draft bar 12, trunnions 34 that
pipe 55. The end member 53 is a plate that is detachably
provide for its tilting movement about an axis parallel to
connected to the outer end of the pipe 55 by a bolt 57
the draft bar 12, and a slide support for the frame 17 on
the draft bar 12 so that the position of the driver 8 may
and has a circular disc 58 secured to the inner surface
bars 41 in symmetrically and circumferentially spaced posi
tatably supported by bearings 66 in axially spaced posi
thereof for holding the outer ends of the bars 56 against
be adjusted laterally in the space 22 between the draft 25 ?exing movement toward the pipe 57. A mounting shaft
links 13. Separate double-acting reversible ?uid-pressure
59 has one end rigidly secured in the pipe 55 and its other
motors 35 and 36 operate respectively to tilt the driver
end rotatably supported in a bearing 60 that is secured by
housing 131 about the axes of the bearing 33 and the trun
a mounting plate 61 to the side bar 41. In operation, the
nions 34, and a bell-crank linkage 37 operated by a pivoted
stem 54 and end members 52 and 53' of each reel 24 ro
hand-lever 38 shifts the frame 17 and thereby the housing 30 tate in response to a strand of wire being withdrawn from
31 laterally on the draft bar 12.
a coil supported on the stem 54 and the shaft 59 turns in
As best shown in FIGURES 4 and 5, a rectangular
the bearing housing ‘60*. A sprocket wheel 62 is secured to
frame 49 furnishes a support for the reels 24 and the fric
each end member 52 by a hollow tubular connecting mem
tional tensioning unit 27 of this invention on the platform
ber 63 for rotation therewith. While each reel 24 has an
9. The frame 40‘ is comprised of spaced side bars 41, a 35 identical construction, the tubular connecting members 63
top bar 42, and a center bar 43 extending between and
have different axial lengths so that the sprocket wheels 62
bracing the side bars 41 at points between their upper and
on the different reels 24 are spaced axially relative to each
lower ends. The lower ends of the side bars 41 have out
other as shown in FIGURE 5 for a purpose to be de
scribed.
turned base members 44 that are welded to the platform 9.
The reels 24, preferably four in number as shown in FIG 40
The tensioning unit 27, as best shown in FIGURES 7
URE 4, are mounted in vertically spaced pairs on the side
and 8, comprises four sprocket wheels 65 that are ro
tions about the axis of the tensioning unit 27, which is sup
tions for rotation on a shaft 67, there being a separate
ported on the frame center bar 43 at a point centrally
sprocket wheel 65 for each of the dispensing reel sprocket
thereon. The reels 24 and unit 27 respectively rotate 45 wheels 62 for a purpose to be described. Each of the
about horizontal axes that are parallel and extend in a
direction transversely of the path of movement of the car
riage along a fence line. Each of the reels 24 in opera
tion is adapted to support a coil of fence wire from which
the strands of wire being strung along a fence line are dis 50
pensed during forward movement of the platform 9 by
the tractor '3. For a purpose to be described such coils of
fence wire are mounted on the reels 24 so that adjacent
sprocket wheels 65 has a braking surface 68 on one side
thereof and a frictional brake lining 69 on the other side
thereon. The brake linings 69 are annular discs of brake
lining material that have :a cemented connection 70 to an
annular disc 71 of Masonite or similar mounting mate
rial, which in turn has a cemented connection 72 to the
pairs about the axis of the braking unit 27 rotate in oppo
sprocket wheel 65. The sprocket wheels 65 are arranged
on the shaft 67 in axially spaced positions between a pair
of frictional braking elements 73 and 74. The braking
site directions as indicated by the arrows in response to the
element 73 is a steel disc through which the shaft 67
strands of fence wire being pulled therefrom.
extends and has a welded connection with the frame center
The strands of wire being dispensed are directed up
bar 43- by which it is held against rotation. The disc
wardly from each reel 24 over guide sheaves 45 supported
73' provides a braking surface 75 that has frictional engage
on the frame 40, the strands being dispensed from the
ment with the surface 76 of the brake lining 69‘ on the
upper pair of reels 24 being respectively guided over the 60 adjacent sprocket wheel 65. The braking element 74 is
pair of guide sheaves supported on the top bar 42 of the
a steel disc that has a welded connection 77 with a bolt
frame 49 and the strands being dispensed from the lower
78 on one end of the shaft 67 which holds it against ro
pair of reels 24 being respectively guided over the sheaves
tation relative to the shaft 67. The inner-face of the disc
45 mounted on the side bars 41. From the sheaves 45,
74 has a lining 79 of braking material that engages the
the strands of wire are guided over four vertically spaced 65 surface 68 on the outermost or adjacent sprocket wheel
sheaves 46 that are mounted in vertically spaced positions
65. The brake lining 79 is a disc of brake lining material
on a frame member 47 carried by the platform 9 for rota
that has a cemented connection 80* to a disc 81 of Ma
tion about a common vertical axis. From the sheaves 46,
sonite or other mounting material, which in turn has a
the strands of wire travel over vertically spaced guide
cemented connection 82 to the steel disc 74. The other
sheaves 48 (FIGURE 3) that are supported for rotation 70 end of the shaft 67 extends through aligned openings 83
about vertically spaced horizontal axes on a supporting
in the braking element 73 and a pair of mounting lugs
bar 49. The bar 49 has a plurality of vertically spaced
84 and 85 that are welded to the frame center bar 43 in
openings 50 therein in which the guide sheaves 48 are
positions depending therefrom, the braking element 73
mounted and which provide for adjustment of their rela
having a welded connection 86 with the mounting lug 84.
tive vertical positions. The sheaves 46 and 48 in oper 75 A bolt 87 (FIGURE 7) detachably received in an opening
3,098,624.
-
88 extending diametrically of the shaft 67 engages a
block 89 that is welded in position between the lugs 84 to
hold the shaft 67 against rotation, but permits axial move
ment of the shaft 67 in the openings 83. A spring 90
l
6
reels for each of said strands and each being adapted to
support a coil of fence wire from which one of said
strands is dispensed when said platform is moved along
said fence line, of a common braking unit comprising a
plurality of rotatable members mounted in axially spaced
positions for rotation about a common axis, there being
its other end bearing against a nut 91 threaded on the outer
one of said members for each of said strands, a plurality
end of the shaft 67 as shown in FIGURE 7. The spring
of separate means for rotating said rotatable members
90 provides a bias for moving the shaft 67 and the end
respectively in response to dispensing movement of said
disc 74 thereon in a direction toward the braking element 10 strands, and frictional braking means for resisting the ro
73 to maintain the braking sprocket wheels 65 engaged
tation of each of said rotatable members and operating
through said responsive means for applying tension to each
with each other and with the end discs 73‘ and 74 as shown
in FIGURE 7. The biasing action of the spring 90* may
of said wire strands.
2. Apparatus as de?ned in‘ claim 1 characterized by
be adjusted by rotating the nut 91 and a handle 92 is
welded to the nut 91 to facilitate this adjustment.
15 said separate means operating to rotate adjacent ones
of said rotatable members in opposite rotational direc
It will be recalled that each of the tubular connecting
mounted concentrically on the outer end of the shaft 67
has 1one end bearing against the mounting lug 85‘ and
tions.
3. Apparatus as de?ned in claim 1 characterized by
each of said separate means comprising a chain-belt and
in FIGURE 5. The axial spacing of the sprocket wheels 20 sprocket drive forming a driving connection between‘ one
of said reels and one ‘of said rotatable members.
62 in this respect corresponds to the axial spacing of the
4. Apparatus as de?ned in claim 1 characterized by
sprocket wheels 65 of the braking unit 27 so that each
members 63 on the reels 24 have different axial lengths
so that the sprocket wheels 62 that rotate with the reels
24 are axially spaced relative to each other as best shown
reel sprocket wheel 62 lies in a vertical plane containing
one of the braking unit sprocket wheels 65. Sprocket
said reels being rotatable about parallel axes respectively
disposed in :circumferentially spaced positions about said
chains 93 are trained over the sprocket wheels 62 and 25 common axis.
5. Apparatus for stringing plural strands of fence wire
65 that lie in a common vertical plane and form a drive
under tension along a line of fence posts comprising the
connection between each reel 24 and one of the braking
unit sprocket wheels 65. As the result of the driving
connection provided by the sprocket chains 93‘, rotation
combination with a platform movable along said fence
‘line, and a plurality-of rotatable fence wire dispensing
of each reel 24- in response to a strand of wire being 30 reels mounted on said platform, there being one of said
reels for each of said strands and each being adapted to
pulled from a coil of wire supported thereby imparts ro
support a coil of fence wire from which one of said
tation to one of the braking unit sprocket wheels 65.
strands is dispensed when said platform is moved along
Since the reels 24 rotate in opposite rotational directions
said fence line, of a mechanism for placing each of the
as explained above, adjacent sprocket wheels 65 rotate in
opposite rotational directions on the shaft 67. This rota 35 strands being strung under equal tension comprising driv
ing sprocket wheels secured to said reels for rotation
tion of the sprocket wheels 65 is subject to a retarding
therewith in response to dispensing movement of said
torque that is developed by the brake lining surfaces on
opposite sides of each sprocket wheel 65. This retarding
fence wire strands therefrom, a plurality of driven
sprocket wheels mounted in axially spaced positions for
torque is applied through the chains 93 to the reel sprocket
rotation about a common axis, chain belts forming driv
wheels 62 which thus retard the rotation of the reels 24
ing connections between said driving sprocket wheels
and apply tension to each of the strands of wire being
and driven sprocket wheels, and frictional braking means
pulled therefrom.
for retarding the rotation of said driven sprocket wheels
From the foregoing it will be apparent that the appa
to thereby apply a retarding torque to said reels and a
ratus of this invention operates to string plural strands
of fence wire under equal tension along a line of fence 45 corresponding tension to said strands.
6. Apparatus as de?ned in claim 5 characterized by
posts. Attention is particularly directed to the fact that
the provision of a single means for adjusting the retard
the coils of fence wire are placed on the reels 24 so that
ing action of said frictional braking means on each of
adjacent pairs thereof as well as adjacent tones of the ten
said driven sprocket wheels.
sioning unit braking discs or sprocket wheels 65 will ro
7. In apparatus for stringing plural strands of fence
tate in opposite rotational directions in response to the
wire along a line of fence posts, a platform for move
strands of wire being pulled therefrom during a stringing
ment along said fence line, a frame mounted on said
operation of the apparatus. After placing the coils of
platform, a supporting shaft mounted for endwise move
fence wire on the reels 24 in this manner, the strands of
ment on said frame, a ?rst frictional braking disc se
fence wire are strung over the guide sheaves 45, 46 and 48
and fastened to one of the fence posts 2 as described above 55 cured to said frame and having an opening therein
through which said shaft extends, a second frictional
so that the strands will be dispensed from the reels 24
braking disc secured to said shaft in‘ a position spaced
when the carriage l is pulled by the tractor 3 along the
from said ?rst braking disc, a plurality of frictional brak
line of fence posts 2. By reason of the retarding torque
ing discs corresponding in number to the number of said
developed by the tensioning unit 27 of this invention, the
strands of fence wire are strung under equal tension, which 60 strands and mounted for independent rotation on said
shaft in axially spaced positions between‘ said ?rst and
may be regulated by rotating the nut 91 to adjust the
second braking discs, means resiliently biasing the end
biasing action of the spring 90‘ and thereby the frictional
wise movement of said shaft on said frame in a direction
braking action of the brake linings 69‘ and 79‘, and thus
for moving said second disc toward said ?rst disc to
in parallel positions equally spaced relative to each other
65 maintain adjacent ones of said plural discs in frictional
along the line of fence posts 2.
engagement with each other and the end ones of said
While one embodiment of my invention has been shown
plural discs in frictional engagement respectively with
and described it will be apparent that other adaptations
said ?rst and second discs, a plurality of rotatable fence
and modi?cations may be made without departing from
wire dispensing reels mounted on said platform, there
the scope ‘of the following claims.
70 being one of said reels for each of said strands and each
I claim:
being adapted to support a coil of fence wire from which
1. Apparatus for stringing plural strands of fence wire
one of said strands is dispensed when said platform is
under tension along a line of fence posts comprising the
moved along said fence line, and means for applying a
combination with a platform movable along said fence
retarding torque to rotation‘ of said reels in response to
line, and a plurality of rotatable fence wire dispensing
reels mounted on said platform, there being one of said 75 dispensing movement or said strands comprising chain
3,098,624
8
and sprocket drives respectively forming a driving con
11. An apparatus as de?ned in claim 9 characterized
nection between each of said reels and one of said plu
by said reels being symmetrically disposed in circumfer
entially spaced positions about said shaft.
12. Apparatus for stringing plural strands of fence
rality of braking discs.
8. An apparatus as de?ned in claim 7 characterized by
the provision of means for adjusting the biasing action of
wire under tension along a line of fence posts comprising
the combination with a platform movable along said
fence line, and a plurality of rotatable fence wire dispens
ing reels mounted on said platform, there being one of
said reels for each of said strands and each being adapted
said resilient biasing means on said shaft to thereby
adjust the retarding torque applied to said reels and the
tension on said strands.
9. In apparatus for stringing plural strands of fence
wire along a line of fence posts, a supporting frame, a 10 to support a coil of fence wire from which one of said
strands is dispensed when said platform is moved along
shaft mounted for endwise movement on said frame, a
?rst frictional braking disc secured to said frame and
having an opening therein through which said shaft ex
said fence line, of a common braking unit comprised of
a plurality of separate means respectively responsive to
tends, a second frictional braking disc secured to said
the dispensing operation of said strands for placing said
shaft in a position spaced from said ?rst braking disc, a 15 ‘strands under equal tension, each of the said separate
plurality of frictional braking discs corresponding in
means of said braking unit comprising a rotatable mem
number to the number of said strands and mounted for
ber that is rotated in response to dispensing operation of
independent rotation on said shaft in axially spaced posi
one of said strands and a frictional brake for retarding its
rotation so that it operates to- resist the dispensing opera
tion of said one strand and to thereby place it under
tions between said ?rst and second braking discs, means
resiliently biasing the endwise movement of said shaft
on said frame in a direction for moving said second disc
toward said ?rst disc to maintain adjacent ones of said
plural discs in frictional engagement with each other and
the end ones of said plural discs in frictional engagement
respectively with said‘?rst and second discs, a plurality
of reels for supporting coils of fence wire from which
said strands of fence wire are dispensed in being strung
along said fence line, and separate means for rotating
said frictional discs respectively in response to dispensing
20.
‘
References Cited in the ?le of this patent
UNITED STATES PATENTS
25'
movement of said strands from said reels.
30
10. An apparatus as de?ned in claim 9 characterized
by said last named means operating to rotate adjacent
ones of said plurality of friction discs in opposite rota
tional directions.
tension.
337,119
457,138
2,570,617
Bigelow _____________ __ Mar. 2, 1886
Thorp ________________ __ Aug. 4, 1891
I
Wentz _______________ __ Oct. 9, 1951
2,635,827
Stemrn et
2,702,934
Frye _______ __'_ ______ __ Mar. 1, 1955
_________ __ Apr. 21, 1953
2,789,778
2,924,869
Zogg et al ____________ __ Apr. 23, 1957
Klein et al. __________ __ Feb. 16, 1960
11,998
Great Britain ______________ __ of 1908
FOREIGN PATENTS
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