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Патент USA US2111624

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March 22, 1938.
R. A. HAMMACK
FUSE CONSTRUCTION
Filed NOV. 8, 1935
2,111,624
2,111,624
Patented Mar. 22, 1938
UNITED STATES PATENT OFFICE
2,111,624
FUSE CONSTRUCTION
Ramesis Alfonso Hammack, Idledale, 0010., as
signor to Line Material Company, South Mil
waukee, Wis., a corporation of Delaware
Application November 8, 1935, Serial No. 48,837
3 Claims.
(Cl. 200-133)
This invention relates to a fuse construction.
Objects of this invention are to provide a very
simple type of fuse construction which may be
used in any capacity but is eminently suitable for
5
use as a secondary fuse.
‘ It is well known that where very small amper
age primary link fuses are used when fusing a
transformer for instance, that it is usually the
practice to use nothing smaller than a 3-ampere
1O fuse for example, with the result that there is
often over fusing of the smaller transformers,
particularly of the 13,000 volt class, and secon
dary fuses are therefore necessary for overload
protection.
15
the porcelain body portion has been indicated
by the reference character I. This porcelain
body portion is provided with a plurality of pairs
of channels 2_-2, and 3—-3 located in diametric
relation to each other. The channels 3—-3 com
municate with an opening 4 extending trans
versely through the porcelain insulator and the 10
channels 2—2 communicate with an opening 5
extending transversely through the porcelain in
sulator and arranged at right angles to the open
ing. 4.
Additionally, it is advisable to use secondary
fuses where there are grouped secondaries of the
The line wire 6 is passed through the opening 15
5 and lies within the channels 2. It is looped
transformers to prevent “outage” of the entire
back upon itself and twisted or otherwise locked
group in case of failure of a single transformer.
This invention is designed to provide a simple
type of fuse which may be used as a suspension
O fuse and therefore does not require any addi
tional room on the cross arm of a pole, for ex
ample, but which may be employed as a suspen
sion fuse directly in the secondary line so that
the minimum space is required.
Further objects are to provide a novel form of
suspension fuse construction in which a porcelain
body portion is employed and is so joined to
the line wires that the porcelain is placed under
compression, and in which no strains are imposed
3O
on the fuse link or fuse member, such fuse mem
ber being held in spaced relation to the line wires
and being so held that it may be very readily
refused.
35
In some of the previous constructions of sus
pension fuses it has been the practice to provide
a separate insulating block which acts as a
mounting member for the fuse link. This in
vention, however, has for its further object the
4.0 provision of a suspension fuse in which the strain
member also serves as a spacing member for
the fuse link.
Further objects are to provide a construction
which is easy to install, which is reliable in oper
45 ation, and which may be placed in any position
desired, either horizontally, vertically, or in an
angular position.
An embodiment of the invention is shown in
the accompanying drawing, in which:
Figure 1 is a side elevation with parts broken
away showing the fuse construction.
Figure 2 is a plan view of the structure shown
55
lain insulator, such view corresponding to a sec
tion on the line 3-3 of Figure 1.
Referring to the drawing, it will be seen that
in Figure l.
Figure 3 is a sectional view through the porce
in place, as indicated at l in Figures 1 and
2. The line wire 8 is passed through the opening
4 and lies within the channels 3. It is looped
back upon itself similarly to the line wire 6 and
‘is twisted or otherwise looked, as indicated at 9.
Bracket members 10 and II are bolted to- oppo
site ends of the porcelain body portion l in any
suitable way, as by means of bolts or screws ce
mented into the porcelain body portion as indi
cated in Figure l, and have outwardly turned
N)
terminal portions.
Any convenient means may be provided for
bolting the bared ends of the line wires 6 and
8 to these terminal members and for clamping
the fuse link hereinafter described in place. For
example, screws I2 may pass through the mem
bers l0 and H and may be provided with nuts
I3 and thumb nuts M.
The bared end of the line wire 6 is secured to
the terminal member i0, suitable washers being
positioned on opposite sides of the bared end of
the line wire 6 and such end being clamped in
place by the nut l3. The bared end of the line 40
wire 8 is similarly locked to the terminal mem
ber H.
A fuse link 15 is supported from the terminal
members, preferably being held between wash
ers and locked by the thumb nuts 14, as. indicated 4:"
most clearly in Figure 1.
The fuse link 15 is thus spaced a considerable
distance from the line wires and also is spaced
from the porcelain member. It is not subjected
to any mechanical strain whatsoever.
50
The member 2 is preferably of porcelain. or
glass to prevent serious burning and carbonizing
from the are when the fuse blows under heavy
current. Also it is to be understood that if it is
desired, the fuse link may be enclosed in a fiber 55
2
2,111,624
or protective tube to prevent metallic deposit
from the fuse link or any damage to the insulator
when the fuse blows, though generally this is not
found necessary.
It is obvious that these fuses may be placed in
the most convenient location for refusing and
that they do not require any space on a pole arm
or cross bar. Also they employ very little mate
rial and are easy to produce so that they are very
10 mexpensive.
In refusing it is apparent that unscrewing the
nuts M will not loosen the line wires as they
are clamped by the nuts l3. Consequently a new
fuse link may be substituted for the blown fuse
15 link with the utmost ease.
It is to be noted particularly that this inven
tion provides a porcelain or other similar body
portion which is preferably held in compression
and which carries a fuse structure. The partic
20 ular form of fuse construction may, of course, be
varied without departing from the spirit of this
invention.
It is to be understood that these suspension
fuses may be placed horizontally, vertically or at
an angle or in any desired position, and that the
fuse link may be above, to the side, or below the
porcelain body portion as desired.
Although the invention has been described in
considerable detail, it is to be understood that
the description is intended as illustrative rather
than limiting, as the invention may be variously
embodied and is to be interpreted as claimed.
I claim:
1. A fuse construction comprising a body por
35 tion formed of relatively brittle insulating mate
rial and having ?at ends and having pairs of dia
metrically opposed, longitudinally extending
grooves therein, said body portion having spaced
holes extending transversely from one groove to
the diametrically opposite groove and adapted to
receive looped conductors with the loop of one
conductor interlinking with the loop of the other
conductor and spaced therefrom by the insulat
ing body portion, whereby said insulating body
45
portion is put under compression, metal terminal
members carried by the ends of the body portion
and secured against the end faces thereof and
projecting outwardly therefrom and having
means for receiving conductors, a fuse link ex
tending from one terminal member to the other
terminal member longitudinally of said body por
tion, and clamping means carried by said termi
nal members for removably clamping said fuse
link.
2. A fuse construction comprising a body por
tion formed of relatively brittle insulating mate
rial and having pairs of diametrically opposed,
longitudinally extending grooves therein, said 10
body portion having spaced holes extending
transversely from one groove to the diametrically
opposite groove and adapted to receive looped
conductors with the loop of one conductor inter
linking with the loop of the other conductor and 15
spaced therefrom by the insulating body portion,
whereby said insulating body portion is put under
compression, said body portion having ?at ends,
metal terminal members secured to the ?at ends
of said body portion and projecting laterally 20
therefrom, said terminal members being located
within the loops of said conductors, clamping
means carried by said terminal members for re
ceiving the ends of conductors, a fuse link ex
tending from one terminal member to the other
terminal member and held in spaced relation to
said body portion, and means for clamping the
ends of the fuse link to the terminal members.
3. A fuse construction comprising a body por
tion formed of relatively brittle insulating mate 30
rial and having pairs of diametrically opposed,
longitudinally extending grooves therein, said
body portion having spaced holes extending
transversely from one groove to the diametrical
ly opposite groove and adapted to receive looped 35
conductors with the loop of one conductor inter
linking with the loop of the other conductor and
spaced therefrom by the insulating body portion,
whereby said insulating body portion is put under
compression, said body portion having ?at ends,
terminal members secured to the ?at ends of said
40
body portion and projecting outwardly therefrom
and having means for receiving conductors, and
fuse means normally electrically connecting said
terminal members and located oppositely and 45
paralleling a portion of said body between ad
jacent grooves.
RAMESIS ALFONSO HAMMACK.
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