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This
invention relates to wire-transposing and resistance-balancing devices
applicable to parallel paired wires to reverse their position relatively
to each other at spaced intervals, and specifically to a
wire-transposing bracket adapted to be mounted on the cross arm of a
line pole or on other appropriate supporting structure. Objects
of my invention are to provide a wire transposing bracket for fixed
mounting in which the insulators forming elements of the bracket are
firmly and adequately supported against the thrust of the line wires; to
provide a transposing bracket in which line wires trained on the
insulators of the bracket readily may be brought into adequately
tightened condition without exercising special pains and effort, without
deforming or otherwise injuring the mounting pins of the insulators and
while preserving the intended spacing of the crossed wires as defined by
the relative spacing of the wire-receiving grooves of the Insulators. Another
object of my invention is to provide a wire transposing bracket of the
indicated sort which has structurally a high order of firmness, strength
and durability. Another
object of my invention is to provide a wire-transposing bracket in which
the structural form of the bracket frame and the structural form and
size of the insulators are so correlated as to give a desired spacing of
the crossed wires and to accommodate to the use of insulators of small
size and relatively simple spool-form. In
previous structures in which the line wires have been trained at the
cross arms of line poles over insulators threaded on cobs, or on sleeves
of lead or the like surrounding the insulator pins, the tightening of
the transposed wires has been a troublesome and laborious operation.
With such insulator mountings tightening of the transposed wires tends
to rotate two of the insulators in one direction and the other two
insulators in an opposite direction. This rotation serves to run two of
the insulators upwardly of the insulator pins and to run the other two
insulators downwardly on the pins. In any event this destroys the
desired vertical spacing between the line wires. It also tends to loosen
or even to remove those insulators which are so rotated on the pins to
which they are threaded as to run them upwardly on those pins and tends
actually to crack those insulators in which a downward pressure is
exerted by their rotation. In tightening the line wires at the poles
after they have been trained on the insulators it has therefore been
necessary to have a linesman on each pole, carefully to ease the In
the transposition bracket of my invention the insulators are mounted for
free rotation and without threading on insulator pins which are
supported in balanced relation at both ends of the insulator. In
tightening the crossed line wires there is no tendency to run the
insulators either upwardly or downwardly on their mounting structure,
but on the contrary the free rotation of the insulators permits
tightening of the wires by a Simple longitudinal pull without altering
the spacing between wire-receiving grooves of the insulators and without
tending to injure either the insulators or the adequately supported
insulator carrying pins of the bracket assembly. The support for the
insulator pins is provided by installing them in clevises opening
outwardly of the frame structure of the bracket, and a desired spacing
between the wire receiving grooves of the insulators is obtained by
relatively offsetting the devises for the pins on which the insulators
are rotatably mounted. Also in the preferred construction of my
transposition bracket the organization of the frame structure is such
that there are no bolts, rivets or other connecting elements to work
loose or to be sheared in service. In
the accompanying drawings: Fig.
I is a plan view of my transposition bracket viewing the bracket and a
cross arm on which it is mounted with the cross arm running transversely
of the sheet. Fig.
II is-an elevation of one end of the bracket looking upwardly of the
sheet. Fig.
III is an elevation of the opposite end of the bracket looking
downwardly of the sheet. Fig.
IV is a broken plan view of a bracket identical in structure with the
bracket shown in Fig. I but viewed with the cross arm running vertically
of the sheet. Fig.
V is an elevation of one side of the bracket looking upwardly of the
sheet. Fig.
VI is an elevation of the other side of the bracket looking downwardly
of the sheet. As
shown, the frame structure of my bracket is a one-piece casting of
suitable metal and preferably is a casting of one of the "light
metals" such as aluminum, or aluminum alloy, magnesium or magnesium
alloy. Unless it should under special circumstances be desirable
otherwise to arrange the insulators of the bracket, they are in
approximately rectangular arrangement in plan and the shape of the
bracket is conformable to such arrangement.
Primarily considered, the frame structure of the bracket
comprises and reaches 1 and 2 and side reaches 3 and 4 arranged to
provide devises 5, 6, 1 and 8 in which are mounted respectively
insulators 9, 10, 11 and 12. As shown, particularly in figs. IV, V and
VI of the drawings, the base of the bracket is provided by the lower
most portions 3a and 4a of the side reaches 3 and 4 respectively; and
the bracket is shown as mounted on a cross arm 13 by means of bolts 14
passed through suitable matching bolt holes in the side reaches 3 and 4
of the bracket and through the cross arm 13. As shown, these bolts have
heads 15 and carry nuts 16 and washers 17 to bear against the under
surface of the cross arm. All
four devices 5, 6, 7 and 8 of the bracket frame open outwardly of the
frame at the corners of the frame structure. When formed as a one-piece
casting, as shown, the clevises are formed primarily as portions of the
end reaches 1 and 2 of the frame but blend structurally with side
reaches 3 and 4. Thus, taking first end reach 1 of the frame (as shown
in Fig. II), clevis 5, which is a high clevis, is formed with a lower
fork 5a depressed slightly below the plane of the median region 1a of
the reach and upper fork 5b is connected with median region 1a by an
inclined leg 5c. Reversely,
clevis 1 which is a low clevis has its upper fork 7b deflected upwardly
from median portion 1a of end reach 1 and its lower fork 7a is connected
with median reach 1a by inclined leg 7c.
As appears in Fig. II, the wire-receiving grooves 9a of insulator
9 and 11a of insulator 11 are spaced equidistantly above and below the
median region 1a of the reach and this vertical spacing of the
wire-receiving grooves and wires trained on them is modified by the
downward deflection of fork 5a of clevis 5 and the upward deflection of
fork 7b of clevis 7. In
the other end reach 2 (as shown in Fig. III) clevis 6, which is a high
clevis arranged diagonally across the frame from clevis 5, has its forks
6a and 6b and connecting leg 6c arranged identically with corresponding
elements of clevis 5 with respect to each other and the associated
median region 2a of their end reach 2. Similarly clevis 8 which is a low
clevis lying diagonally of the frame from low clevis 7 has its forks 8a
and 8b and connecting leg 8c arranged identically with the corresponding
elements of clevis 7 with respect to each other and to the associated
median region 2a of their end reach 2. Referring
now more particularly to Figs. IV, V and VI of the drawings, side reach
3 which extends transversely between end reaches 1 and 2 and side reach
4 which also extends transversely between end reaches 1 and 2 have, as
noted, approximately plane lower, or base, regions 3a and 4a at which
the bracket as a whole is attached to cross arm 13 or other supporting
structure as by bolts 14. From base region 3a of side reach 3 leg 3b
extends upwardly to and blends with the lower fork 6a of clevis 6 and an
inclined leg 3c extends a shorter distance upwardly to and blends with
the lower fork 7a of clevis 7. Similarly inclined leg 4b of clevis 4
extends upwardly to and blends with the lower fork 5a of clevis 5 and
inclined leg 4c extends upwardly a shorter distance and blends with the
lower fork 8a of clevis 8. It will be seen that the longer legs 3b and
4b and the shorter legs 3c and 4c of the side reaches 3 and 4 are
staggered relatively in the frame structure. All of the insulators 9, 10, 11 and 12 are primarily of spool-form,
having respectively the wire
receiving grooves 9a, 10a, 11a and 12a, noted above. These insulators
may be made of glass, porcelain, hard rubber, fiber or plastic
composition or any other material having suitable physical properties
and adequate electrical resistance. As shown, each of the insulators is
freely rotatable on an insulator pin 18 which passes through both forks
of the clevis and which has a head 18a resting on the upper surface of
the upper fork and a portion 10b extended below the under surface of the
lower fork. As shown, a cotter pin 19 secures the insulator pin against
misplacement, and other suitable securing means such as a nut and washer
might equivalently be used. Referring
to Fig. 1 of the drawings, paired wires are shown in transposed relation
on the bracket with wire A trained on diagonally opposed low insulators
7 and 8 and wire B trained on diagonally opposed high insulators 5 and
6. In this relation the wires A and B cross each other within the bounds
of the bracket, with a vertical spacing determined by the vertical
spacing between the wire-receiving grooves 9a and 11a of the high
insulators and the wire-receiving grooves 10a and 12a of the low
insulators. In tightening the transposed wires, the rotation of the
insulators in their free, unthreaded mounting on the pins obviates the
necessity for easing the wires along in their trained relation with the
insulators. The mounting being unthreaded, there is no tendency for the
drag of the wires to run the insulators upwardly or downwardly and thus
to impair accurate spacing between the wires trained on the upper and
lower insulators. I have found that insulators, even though of spool-form cannot satisfactorily be made rotatable in a transposition bracket unless the pins on which they are mounted are supported beyond both ends of the insulators. This support is provided by the clevises of my bracket. With support for the insulator pins, the rotatable insulators need not be of the height and weight of the insulators commonly used to support the insulator pin above the wire receiving groove of the insulator and to counterbalance the thrust of the wire as transmitted to the pin. It is thus possible to use small spool-form insulators, which are in fact peculiarly adapted to mounting on clevis-supported pins. With this mounting of the insulators in clevises of the bracket frame, it is possible to modify the spacing of the crossed wires within the bounds of the bracket by the relative vertical spacing of the clevises. Thus the offset relation of the lower forks of the clevises of the high diagonal pair and the upper forks of the clevises of the low diagonal pair with respect to a median plane, modifies the relative positioning of the open insulator-receiving spaces between the forks of the high and low clevises respectively. By this structure, insulators of a desired form and with a desired positioning of their wire receiving grooves may be used without causing an awkwardly great vertical spacing |
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of the bracket frame. This
arrangement, by modifying the spacing between the wire-receiving grooves
of the insulators gives accommodation to the positioning of the
insulators with their wire-receiving grooves spaced on opposite sides of
a common median plane. Because
the insulators are mounted in the clevises, the wires trained on the
insulators in their wire-receiving grooves are confined within the
clevises. There is therefore no likelihood that there will be a
"floater," that is an upwardly escaped wire, if an insulator
should be broken in service,
in its structure the -bracket frame desirably is, as shown, a one-piece
casting in which the forks of the clevises blend With the reaches of the
frame to give a firm, strong structure integrated without the use of
bolts, rivets or other pieces susceptible of sheering or working loose. While
the bracket frame in the embodiment of my invention herein illustrated
and described is a one-piece casting, as is most desirable, it is to be
understood that certain aspects of my invention remain even though the
integration of the bracket frame be otherwise obtained. Also it is to be
understood that other modifications in the form and arrangement of the
bracket elements may be made within the bounds of my invention as
defined in the appended claims. I
claim as my invention: 1.
A wire-transposing bracket for fixed mounting on a supporting structure
comprising a frame integrally cast from a light metal selected from the
group consisting of magnesium, aluminum, and their alloys and having two
transverse reaches with lower regions providing a base for engagement
with the supporting structure and two legs of unequal length and
included in the lower forks of four clevises, the longer and shorter
legs of the two transverse reaches being staggered relatively in the
frame structure, two reaches extended between the said transverse
reaches and terminally forked at both ends of each with each lower fork
blended with an upwardly extended leg of a transverse reach and with
their upper forks arranged in vertical alignment with the said lower
forks, to provide four outwardly open insulator mounting clevises in
diagonal pairs with the clevises of one diagonal pair at a different
level than the clevises of the other diagonal pair, and spool form
insulators rotatably mounted in said clevises with the wire receiving
grooves of one diagonal pair at a different level than the wire
receiving grooves of the other diagonal pair for the relative spacing of
wires trained respectively on the said diagonally arranged pairs of
insulators and crossed within the bounds of the frame. 2.
A frame structure for a wire transposing bracket adapted for fixed
mounting on a supporting structure, said frame being integrally cast
from a "light" metal selected from the group consisting of
magnesium, aluminum, and their alloys and having two transverse reaches
with lower regions providing a base for engagement with the supporting
structure and two legs of unequal length each blended into the lower
fork of one of four insulator mounting clevises, the longer and shorter
legs of the two transverse reaches being staggered relatively in the
frame structure, and two reaches extended between the said transverse
reaches and terminally forked at both ends of each with each lower fork
blended with an upwardly extended leg of a transverse reach and with
their upper forks arranged each in vertical alignment with one of the
said lower forks, to provide four outwardly open insulator-mounting
clevises arranged in diagonal pairs with the clevises of one said pair
at a different level above the base of the bracket than the other said
pair. 3.
A wire-transposing bracket for fixed mounting on a supporting structure
formed as a frame having two transverse reaches with lower regions
providing a base for engagement with the supporting structure and two
legs of unequal length extended divergently upward from the base portion
of each transverse reach, the longer and shorter legs of the two
transverse reaches being 4.
A frame structure for a wire transposing bracket for fixed mounting on a
supporting structure, said frame having two transverse reaches with
lower regions providing a base for engagement with the supporting
structure and two legs of unequal length extended divergently upward
from the base portion of each transverse reach, the longer and shorter
legs of the two transverse reaches being relatively staggered in the
frame structure, two reaches extended between the said transverse
reaches and terminally forked to provide four outwardly open insulator
mounting clevises, the lower fork of each said clevis being joined with
one of the two said legs upwardly divergent from the base portion of one
of the said transverse reaches, the said clevises being arranged in
diagonal pairs with the clevises of one said pair at a higher level
above the base of the bracket than the other said pair. 5.
A frame structure for a wire transposing bracket adapted for fixed
mounting on a supporting structure, said frame being integrally cast
from a "light" metal selected from the group consisting of
magnesium, aluminum, and their alloys and having two transverse reaches
with lower regions providing a base for engagement with the supporting
structure and two legs of unequal length each blended into the lower
fork of one of four insulator mounting devises, the longer and shorter
legs of the two transverse reaches being staggered relatively in the
frame structure, and two reaches extended between the said transverse
reaches and terminally forked at both ends of each with each lower fork
blended with an upwardly extended leg of a transverse reach and with
their upper forks arranged each in vertical alignment with one of the
said lower forks, to provide four outwardly open insulator mounting
clevises arranged in diagonal pairs with the clevises of one said pair
at a different level than the clevises of the other said pair, the lower
fork of each of the high clevises being deflected downwardly and the
upper fork of each of the low clevises being deflected upwardly with
respect to a common median plane to modify the relative spacing between
the high and low clevises. 6. A wire transposing bracket adapted for fixed mounting on a supporting
structure, said bracket being integrally cast from a "light"
metal selected from the group consisting of magnesium, aluminum, and
their alloys and having two transverse reaches with lower regions
providing a base for engagement with the supporting structure and two
legs of unequal length each blended into the lower fork of one of four
insulator mounting clevises, the longer and shorter legs of the two
transverse reaches being staggered relatively in the
frame structure, and two reaches extended between the said transverse
reaches and terminally forked at both ends of each with each lower fork
blended with an upwardly extended leg of a transverse reach and with
their upper forks arranged each in vertical alignment with one of the
said lower forks, to provide four outwardly open insulator mounting
clevises arranged in diagonal pairs with the clevises of one said pair
at a different level than the clevises of the other said pair, the lower
fork of each of the high clevises being deflected downwardly and the
upper fork of each of the low devises being deflected upwardly with
respect to a common median plane to modify the relative spacing between
the high and low clevises, and spool-form insulators mounted in said
clevises with the wire receiving grooves of the diagonal pairs of said
insulators spaced by the relative position of the said high and low
clevises for the relative spacing of wires trained respectively on the
said diagonally arranged pairs of insulators and crossed with the bounds
of the bracket frame. 7. A wire-transposing bracket for fixed mounting on a supporting
structure formed as a frame having two transverse reaches with lower
regions providing a base for engagement with the supporting structure
and two legs of unequal length extended divergently upward from the base
portion of each transverse reach, the longer and shorter legs of the two
transverse reaches being relatively staggered in the frame structure,
and two reaches extended between the said transverse reaches and
terminally forked at both ends of each to provide four outwardly open
insulator mounting clevises arranged in diagonal pairs with the clevises
of one pair at a higher level above the base of the bracket than the
other said pair, the lower fork of each of the high clevises being
deflected downwardly and the upper fork of each of the low clevises
being deflected upwardly with respect to a common median plane to modify
the relative spacing between the high and low clevises, and spool-form
insulators rotatably
mounted in said devises with the wire receiving grooves of the diagonal
pairs of said insulators spaced by the relative position of the said
high and low clevises for the relative spacing of wires trained
respectively on the said diagonally arranged pairs of insulators and
crossed within the bounds of the bracket frame. 8.
A frame structure for a wire transposing bracket adapted for fixed
mounting on a supporting structure, said frame having two transverse
reaches with lower regions providing a base for engagement with the
supporting structure and two legs of unequal length extended divergently
upward from the base portion of each transverse reach, the longer and
shorter legs of the two transverse reaches being relatively staggered in
the frame structure, and two reaches extended between the said
transverse reaches and terminally forked at both ends of each to provide
four outwardly open insulator mounting clevises, the lower fork of each
said clevis being joined with one of the two said legs upwardly
divergent from the base portion of one of the said transverse reaches,
the said clevises being arranged in diagonal pairs with the clevises of
one said pair at a higher level above the base of the bracket than the
other said pair and with the lower fork of each of the high clevises
deflected downwardly and the higher fork of each of the low clevises
upwardly deflected with respect to a common median plane to modify the
relative spacing between the high and low clevises.
ROGERS CASE. REFERENCES
CITED The
following references are of record in the file of this patent: UNITED
STATES PATENTS Number
Name
Date 889,884 Strong - - - - - - June 2, 1908 2,299,960
Brewster et al.- -Oct.27, 1942 2,356,750 Case - - - - - - - Aug.29, 1944 |