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Патент USA US3098648

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July 23, 1963
Filed Aug. 27, 1959
2 Sheets-Sheet 1
July 23, 1963
Filed Aug. 27, 1959
2 Sheets-Sheet 2
Patented July 23, 1963
FIGURE 5A is a fragmentary detail of the removable
sheave shown in FIG. 5; and
FIGURE 6 is an enlarged fragmentary detail of the
cover securing and roller mounting structures.
In FIGURE 1 a pair of poles 10 and v11 are illustrated
each having a stringing block 12 mounted thereon. A
messenger or supporting cable 13 is strung between the‘
blocks 12 and supports mid-span stringing blocks 14.
Hand lines 15 connected with each of the mid-span string
Anthony McAuley, Maywood, Ill., assignor to A. B.
Chance (Iornpany, Centralia, Mo., a corporation of
Filed Aug. 27, N59, Ser. No. 836,448
3 Claims. (Cl. 254—134.3)
This invention relates to a stringing block and a method
of stringing ?exible members, particularly designed for
stringing multiple conductors and a messenger or support
cable from poles, as in a power distribution system.
Many electrical distribution systems have three or four
ing blocks '14 facilitate positioning of them at appropri
ately spaced distances between poles 10 and 11. A con
ductor 16, of which there may be two or more depending
upon the nature of the particular installation is threaded
conductors strung from a cable \OI' messenger wire sup
through and carried by the pole mounted and mid-span
ported between poles. In installing ‘a system of this 15 blocks 12 ‘and 14. Brie?y, the stringing blocks are used
type, or recabling an old installation, the conductor and
in the following manner. Pole mounted blocks 12 are
messenger wires must be strung along the poles from
secured to the poles along which the conductors are to
which they will be supported, placed under tension and
be strung and messenger cable 13 is threaded through
the installation completed as by cabling the conductors
them. Before the messenger is taken up, mid-span blocks
and messengers together and securing the resulting cable
d4 are attached to it and a hand line may be threaded
to each pole. At the present time a multiple sheave
through the pole mounted and mid-span blocks for each
arrangement is commonly used in stringing such cables.
of the conductors. The messenger is placed under ten
The stringing sheaves are provided with plate-like spacer
sion raising the mid-span blocks into the air and the con
7 elements between the individual sheave wheels which are
ductors are pulled into place. The conductors them—
intended to keep the conductors from tangling. In prac 25 selves may then be placed under tension and the stringing
tice, however, the cables sometimes jump over the
blocks removed. This brief discussion of the method
spacers, become tangled or jammed between the spacers
of stringing conductors will be ampli?ed following a
and sheaves and are sometimes cut or otherwise damaged.
detailed description of the illustrated embodiment of the
A substantial portion of the time involved in stringing
stringing blocks.
cables is spent in freeing jammed conductors and in keep
Turning now to FIGURES 2-4, it will be seen that the
ing the conductors straighlt.
pole-mounted stringing block 12 includes a rectangular
A principal object of the present invention is the pro
frame made up of a base 17, upstanding end members 18
vision of a new and improved stringing block and cable
and 19 and a cover 20 which is hinged at 20a with the
stringing method which greatly facilitates the operation,
top of end member 18. End member v18 is suitably se
reducing the time required and eliminating damage to 35 cured to mounting plate 23 as by bolts 24 and the mount
the conductors.
ing plate is provided with a chain 25 by means of which
One feature of the invention is the provision of a
stringing block including a frame having a plurality of
vertical and horizontal rollers carried therein, the vertical
and horizontal rollers de?ning a plurality of separate wire
guide sections. Another feature is that the frame in
cludes a removable portion which opens each of the wire
it is secured to pole 10. Mounting plate 23 extends be
low the bottom of frame base member Y17 and a brace 26
provides additional support for the assembly. The area
defined by the rectangular frame is divided into a plural
ity of separate wire guide sections by horizontal and ver
tical rollers 27 and 28, respectively. The horizontal
guides permitting removal of the stringing block from
roller includes an axle 30 extending between frame end
the cables after they have been strung ‘and placed under
members 13 and 19, spaced above base member 17, and
45 having a plurality of independent sleeve rollers 31
A further feature is the provision of such a frame with
a separable messenger-receiving guide portion as a re
movable handle on the frame of a “pole-mounted” string
ing block or a removable supporting sheave for a “mid
span” stringing block.
Yet another feature is the method of stringing a plu
rality of conductors and a messenger wire comprising
securing a stringing block to each of the poles, pulling
a messenger cable through the stringing blocks and plac
mounted thereon and free to rotate. Vertical rollers 28
include an axle 32 threaded to base plate 17 and having
a sleeve 33 rotatable thereon. The upper end of each of
axles 32 is preferably pointed for reception in a comple
60 mentary tapered recess '34 in cover member 20‘. Vertical
rollers 28 are located in alignment with joints 31a be
tween horizontal roller elements 31 and together with the
horizontal rollers de?ne a plurality of cable receiving
sections which are closed on top by a removable cover
ing it under tension, pulling conductors through the 55 member 20. A handle 35 is removably secured to the
stringing block and placing them under tension and
?nally removing the stringing blocks from the tensioned
upper surface of cover 20, as by a pair of wing nuts 36,
and together with the cover de?nes a guide for messenger
cable and conductors.
cable 13.
Further features and advantages of the invention will
Cover 20 is provided with a hasp 37 which engages
readily be apparent from the following speci?cation and 60 an eye 38 on end member 19 and may be secured in place
from the drawings in which:
by a snap or the like 39.
FIGURE 1 is a view illustrating use of the invention;
It will be noted that a pair of vertical rollers 28‘ are
FIGURE 2 is an elevation of a pole-mounted stringing
block embodying the invention;
provided adjacent the frame end members 18 and 19.
FIGURE 3 is a section taken generally along line 3—3 65 This prevents the conductors from rubbing against end
members 18 and .19 or against base plate 23‘ or pole 10‘
of FIGURE 2;
as they are pulled through the stringing block.
FIGURE 4 ‘is an enlarged plan view of the stringing
Mid-span stringing block 14, FIGURE 5, is basically
block of FIGURE 2 with a portion of the frame broken
the same as pole-mounted stringing block 12 and the
away for clarity;
FIGURE 5 is an elevation of a mid-span stringing block 70 description of the frame and rollers will not be repeated.
Bracket members 42 and I43 secured to the upper surface
with portions in section;
of cover 20 provide a mounting ?or supporting sheave
44- by which the mid-span stringing block is movably car
departing from the spirit and scope of the invention as
disclosed in the appended claims.
I claim:
ried on messenger cable 13. The brackets are preferably
slotted as illustrated at 45 {to permit removal of sheave
44, facilitating attachment of the stringing block to and
removal from messenger 13. An eye 46 extending down
having a base two ends and a cover, said cover being
hingedly attached to one of said ends; a releasable lock
wardly from frame base member 17 facilitates attachment
norm-ally maintaining said cover connected with the other
1. A stringing block comprising a rectangular frame
end; a row of spaced, vertical axles, each having one end
of hand line 15 for guiding and positioning the mid-span
thereof rigid with said base and disposed ‘substantially
stringing block.
As pointed out above, the ‘?rst step in. stringing cables 10 perpendicular thereto, said cover having a plurality of
is to secure a series of pole-mounted blocks 12 to the
recesses therein for receiving the other end of correspond
poles along which the conductors are to be strung. As
this is done a hand line is run through handles 35 of each
‘of the pole mounted blocks =12 and, after they have been
secured to the poles at the proper height, messenger 13 15
ends, whereby to de?ne a number of wire guide sections; a
cylindrical sleeve roller in surrounding rotatable relation
is pulled through.
While the messenger is hanging
loosely between the poles mid~span blocks 14 are attached
thereto, the number used between each pair of poles
depending upon the distance between them. At the same
time, hand lines for each of the conductors are threaded
through the guide sections de?ned by horizontal and ver~
tioal rollers 31 and 3-2 of the mid-span and pole-mounted
stringing blocks.
Messenger 113 is preferably placed
under tension and conductors 16 pulled into place. When
ing axles; a horizontal axle rigidly interconnecting said
ship with each axle respectively, whereby wires may be
easily drawn through the wire guide sections when the
cover is connected to said other end and the wires may
be easily withdrawn from the string block when the cover
is released from said other end; and means on the ‘frame
for supporting the same.
2. A stringing block as set forth in claim '1, said sup
.porting means including a bracket mounted on said cover;
and a rotatable guide removably attached to said bracket
for receiving a messenger cable, whereby the block may
all three conductors are in position their free ends are 25 be guided into operating position along the cable.
3. The invention of claim‘ 2, an eye mounted on the
base therebelow; and a hand line attached to the eye for
positioning the block along the cable.
tors may be mounted on a single axle and all placed
under tension at the same time, as by means of jacks act
References Cited in the ?le of this patent
ing on the axle. The conductors move freely through the
anchored and they are placed under tension. With these
stringing blocks the cable reels for each of the conduc
cable stringing blocks by virtue of the horizontal and
vertical rollers which divide the frame into cable guiding
sections, and the cables may not jump from one section
to another nor become jammed or damaged. After the
cables are tensioned the mid-span stringing blocks may 35
be moved to the closest pole where a member of the
stringing crew rem'oves sheave 44 and opens cover 20
freeing the stringing block from the cables. At the same
time handle 35 may be removed from pole-mounted 4:0
stringing blocks 12, cover 20‘ opened and the stringing
block taken from the pole. As the stringing blocks are
removed the messenger and conductors may be cabled
together by a suitable mechanism and secured to a cross
arm (not shown) on each of the poles.
While I have shown and described certain embodi
ments of my invention, it is to be understood that it is
capable of many modi?cations. Changes therefore, in»
the construction and arrangement may be made Without
Metzler ______________ __ Feb. 3,
Goodwin ____________ __ Dec. 19,
Hill ________________ __ Apr. 22,
McKissick __________ __ Nov. 29,
Sleeman _______________ _. Mar. 4,
Kakimoto ____________ __ Nov. 10,
Thomas ____________ __ Aug. 28,
Mott ________________ _._ Jan. 3,
Pieper _______________ __ Oct. 31,
Eitel ________________ __ Aug. 16,
Hendrix ______________ __ May 9,
France ______________ _._ Dec. 22, 1905
'Austr-ia ______________ _._ Apr. 10, 1913
Great Britain ________ __ June 23, 1944
Ger-many.--’__________ "June 26, 1958
Germany _________ _;___ June 18, 1959
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