close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2412712

код для вставки
Dec. 17, 1946,
C. W. BROWN
METHOD OF ASSEMBLING FUSE LINKS
Flled July 27, 1942
2,412,712
2 Sheets-Sheet 1
if?
/
17
INVENTOR.
Dec. 17, 1946.
c, w_ BROWN I
2,412,712’
METHOD OF ASSEMBLING FUSE LINKS
Filed July 27, 1942
2 Sheets-Sheet 2
155
\
m,
I"
Patented Dec. 17, 1946
2,412,712‘
UNITED STATES ‘PATENT OFFICE
2,412,712
METHOD OF ASSEMBLIN G FUSE LINKS
Chester W. Brown, Milwaukee, Wis., assignor to
Line Material Company, Milwaukee, Wis., a
corporation of Delaware
1
Application July 27, 1942, Serial No. 452,436
6 Claims. (Cl. 29—155.5)
2
This invention relates to the production of
spring fuse-links of the type and species illus
trated and described in Steinmayer U. S. Patent
No. 2,270,225; and it has to do with an improved
method of manufacture, and particularly a more
facile and speedy method of assembling the com
ponent parts of such fuse-links. The object, of
otherwise securing to one end of leader I 1 the
strain wire 18 and fuse wire l?—the latter being
twisted around the strain wire as shown.
The second step is illustrated in Fig. 2 and con
sists merely in adding spring E55 by threading
therethrough the strain wire and fuse wire.
The third step, depicted in Fig. 3, consists in
course, is to effect a reduction of manufacturing
inserting the free ends of the strain wire and
cost.
fuse wire into the tubular shank of terminal
In the drawings which accompany this speci? 10 member is and locally prick-punching said shank
cation
at 13d in the manner portrayed in the cross—sec
tional detail Fig. 4. This results in ?rmly an
choring the strain and fuse wires to the shank of
Figs. 1 to 7, inclusive, illustrate successive op
rations or steps in the course of assembly of a
fuse-link, conformably to the present invention;
Fig. 8 is a sectional view of a ?attening die,
taken along the line 8-8 of Fig. '7 ;
Fig. 9 is a sectional view of the ?attening die
taken along the line 9-9 of Fig. 8; and
Fig. 10 is an elevational view, partly in section,
of a completed fuse-link.
1
Fig. 11 is an enlarged sectional view take
along the line I l—-I l of Fig. 10.
the terminal member.
The fourth step consists in inserting the as
sembly of Fig. 3 into tube it‘ as illustrated in
Fig. 5.
The ?fth step consists in screwing nut I6 onto
the lower end of spring l5 as depicted in Fig. 6.
20
Thereafter, as a sixth and ?nal step, terminal
"
It is believed most expedious to describe first
the completely assembled fuse-link shown in Fig.
10 and, thereafter, to proceed step-by-step with
a description of the assembling operations.
Referring to Fig. 10, the fuse-link shown com
prises a ?bre protector tube l2, an upper terminal
member I 3, a fusible section l4, and expulsion
spring 15, a nut 16, and a ?exible leader [1.
30
Terminal member I 3 includes a conventional
button-head contact l3a, a tubular shank portion
which is flattened at 13b from just below the
button head contact to just above the upper end
of protector tube 12. Portion I30 of the ter
minal member is not ?attened but is deformed,
as shown in cross-section in Fig. 4, to grip the
upper ends of. a strain wire 18 and a fuse wire l9
constituting fusible section [4. Portion I30 is,
member I3 is pulled longitudinally and outwardly
of tube 12 and the tubular shank portion is ?at
tened at [312, as shown in the cross-sectional view,
Fig. 11. The ?attening of the shank is effected
in a press (not shown) by means of a punch 29
and dies or anvil 2i shown in Figs. 7, 8, and 9.
The punch is a simple metal ?attening tool, the
working end of which only is illustrated. The
upper portion of the punch is, of course, secured
to the ram of the press. Die 2i comprises a base
portion 2m which is secured in any appropriate
manner to the bed or platen of the press in
proper alignment with the punch. Forming an
integral part of and projecting upwardly from
the base portion of the die is a pad 2| b having
a ?nished top surface. At one end of pad Zlb
is a pair of spaced upwardly extending ears 22
and 23 which may be welded or otherwise se
cured to the base. The spacing between the lat
ters ears is su?icient to clear and permit inser
tion therebetween of the portion l3e of button
in the main, cylindrical and a close ?t in the bore
of protector tube I2.
The lower ends of strain wire it’ and fuse wire
head contact lsa.
t the other extremity of pad
H! are soldered to the adjoining end of ?exible
2|b are disposed a second pair of spaced up
leader H’.
standing ears 2-’! and 25. These are aligned with
The upper end of expulsion spring i5 is con 45 cars 22 and 23 respectively and the spacing be
stricted to form an abutment for the upper end
tween them is such as to clear the tubular shank
of the leader; and nut l8 functions to anchor
portion I32).
the lower end of the spring and normally retain
The extent to which tubular shank portion l3c
it under tension. The strain wire normally is
extends into the bore of tube | 2 and, incidentally,
under a predetermined tension effected by the ex— 50 the tension applied to spring I5 is determined by
pulsion spring, and, in event the fusible section
the separation, longitudinally of the fuse-link,
blows, the leader is quickly expelled from the tube
between the pair of cars 22, 23 and the pair of
by the spring. The fuse-link structure just de
cars 24, 25. The latter are beveled at 24c and
scribed is substantially identical with the dis
25a so that the ?owing metal resulting from the
closure of the above mentioned Steimnayer Pat
?attening operation will not make it di?icult to
ent No. 2,2'70,225—tl1e sole novelty residing in the
remove the fuse~link from the die. A knock-out
improved manufacturing method which now will
for ejecting the fuse-link from the die may be
be explained.
employed if desired. This is in keeping with
The ?rst step-of the assembling operation is
well-known die-making practice and needs no
illustrated in Fig. l and consists in soldering or 60 illustration.
2,412,712
3
What is claimed is:
l. The method which includes the following
enumerated steps: (1) making a sub-assembly
comprising a relatively elongate terminal mem
her, a fusible section connected at one end only,
to one end of said terminal member, a conductive
eader connected at one end only to the other
4. The method which includes the following
enumerated steps: (1) attaching end to end a
?exible conductive leader and a fusible section
comprising a'fuse wire and a strain wire in par
allel; (2) adding to the assemblage of step (1) a
helical spring encircling the conductive leader
and having one end anchored to the junction be
tween the conductive leader and fusible section,
said spring extending from said junction away
spring anchored at one end only to said conduc
tive leader and extending, from its anchorage, 10 from said fusible section; (3) inserting the end
of said fusible section remote from said conduc
along said leader and co-axially therewith and
tive leader into one end of an elongate tubular
away from said fusible section; (2) inserting
terminal member and prick-punching said tubu
telescopically into the bore of a protector tube,
lar terminal member laterally to grip the in
the sub-assembly of the?rst step so that the ter
minal member extends into one end of the tube 15 serted end of the fusible section; (4:) inserting
telescopically into the bore of a protector tube
while the free end of the spring projects out of
the ‘assemblage resulting from the three above
the other end of the tube; (3) anchoring the
enumerated steps so that the tubular terminal
aforementioned free end of the spring. to the ad
member extends into one end of‘the protector
jacent end of the tube; (4) applying tensile force
tube while the end of the spring remote from the
axially to said terminal member in a direction to
fusible section is outside the other end of the
effect tensioning of said spring and resultantly
protector tube; (5) anchoring the last-men
to effect a partial withdrawal of said terminal
tioned end of the spring to that end of the pro
member from the bore of the tube and; (5) dis
tector
tube which is remote from said tubular
torting said terminal member outside the bore
‘and adjacent the end of said tube from which 25 terminal member; (6) applying tensile force axi
ally to said terminal member in a direction to
it projects to form a stop engaging said tube for
sheet tensioning of said spring and resultantly to
maintaining said spring under tension.
effect a partial withdrawal of said terminal
2. rI‘he method which includes the following
member from the bore of the protector tube and;
enumerated steps: (1) making a. sub-assembly
comprising a relatively elongate terminal mem 30 (7) ?attening said terminal member outside the
bore and adjacent that end of the protector tube
her, a fusible section connected at one end only
from which it projects to form a shoulder engag
to one end of said terminal member, and a heli
ing the last-mentioned end of the protector tube
cal spring connected at one end only with the
for maintaining said spring under tension.
other end of said fusible section; (2) inserting
5. The method of tensioning a fuse link com
telescopically into the bore of a protector tube
prising a terminal, a. leader, and a strain section
the sub-assembly of the ?rst stepv so that the
mechanically and electrically connecting said
terminal member extends into one end oi‘ the
terminal and leader and including a coil spring
tube while the free end of the spring projects out
surrounding said leader and anchored thereto ad
of the other end of the tube; (3) anchoring the
jacent said section; said method comprising, ?rst,
aforementioned free end of the spring to the end
the mounting of a tube on said leader and mov
of the tube adjacent thereto; (4) applying tensile
ing it to a position embracing said terminal,
force axially to said terminal member in a direc
strain section, and a portion of said spring; sec
tion to eiTect tensioning of said spring and re
ond, the mounting of a nut on the projecting
sultantly to e?ect a predetermined partial with
end of said spring; third, the moving of the tube
‘drawal of said terminal member from the bore
to cause expansion of said spring axially; and,
of the tube and; (5) compressing said terminal
fourth, the deforming of said terminal to provide
member laterally to form one or more shoulders
‘tube engaging means for holding tle tube in
thereon immediately adjacent the end of said
spring expanded position.
'
'
tube to prevent contraction or said spring ‘and
6. ‘The method of assembling a spring ten
thereby normally to maintain said spring under
sioned fuse link, said method comprising in se
quence as follows: ?rst, securing a ?exible cable
3, The method which includes the following
and strain wire together in end to end relation;
enumerated steps: (1) making a sub-assembly
second,
passing the strain wire and a portion of
comprising a relatively elongate terminal mem
end only of said fusible section, and a helical
tension.
‘
'
ber, a fusible section connected at one end only
to one end of said terminal member, and a hell
cal spring connected at one end only with the
other end of said fusible section; (2) inserting
telescopically into the bore of a protector tube
the sub-assembly of the ?rst step so that the ter
minal member extends into one end of the tube
while the free end of the spring projects out of
the other end of the tube; (3) attaching the pro
jecting free end of the spring to a nut for an
choring the spring to the end of the tube adja
cent thereto; (4) applying tensile force axially
to said terminal member in a direction to effect
the cable through a coil spring and engaging one
end of the spring with the juncture between said
cable and wire; third, passing the end of said
wire remote from said cable into a tubular ter
minal and deforming the end of the latter nearest
said cable to secure it to the wire; fourth, pass
ing the cable, spring, wire, and terminal through
a protectivetube until a portion of the spring is
exposed at the trailing end of said protective
tube; ?fth, passing'said cable through a nut and
screwing said out upon the exposed end of said
spring; sixth, pulling the major portion ‘of said
terminal from said protective tube and coinci~
dental therewith stressing said spring through
the medium of said protective tube and nut; and
tensioning of said spring and resultantly to effect
a predetermined partial withdrawal of said ter
zrinal‘member from the bore of the tube and; 70 seventh, ?attening the exposed. intermediate por
tion of said terminal to spread it laterally into
(5) ?attening the terminal member outside the
position for endwise engagement with said pro
bore. of said tube and immediately adjacent the
tective tube.
end thereof to form stop means for normally re
CHESTER W.’ BROWN. _
taining said spring under tension.
Документ
Категория
Без категории
Просмотров
0
Размер файла
431 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа