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Патент USA US2116269

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May 3, 1938.`
s. KoEszYl
*
2,115,269
METHOD OF FORMING ELECTRICAL CONTACTS
Filed Jan. 18, 1957
2 Sheets-Sheet 2
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Patented May 3, 1938
i 2,116,269
NUNITED STATES PATENT OFFICE
2,116,269 V
METHOD OF FORMING ELECTRICAL
CONTACTS
Steven Kobzy, Chicago, Ill.
Application January 18, 1937, Serial No. 121,106
5 Claims. (Cl. zei-4155.55)
The primary object of this invention is to pro
vide an improved method for producing electrical
contacts from strips of sheet metal through a
series of operations which will involve less time
and less waste of material. This is accomplished
by utilizing a series of spaced stationary
dies and registering, punching, forming and
embossing dies carried -by the stationary and
movable jaws, respectively, of a punch press, and
the terminal lug, is a clip c whose angled 4body
is sufllciently wide to provide for turned sides c’
and c2 which face each other whereby to grip be
tween them and the clip body, the prong (not
shown) of a vacuum tube or other electrical in
strument. Ears d may be extended outwardly
from the clip sides at a point adjacent the mount
ing plate, as shown.
l
The mechanism illustrated for punching and
so arranged that a strip of sheet metal advanced forming this contact from a strip of metal com 10
a predetermined distance at each actuation of prises a series of dies, the stationary element of
the punch press will form the contact by a series
of operations of the dies. This strip may be fed
b-y hand or mechanically.
‘ ,
A mechanism suitable for carrying out this in
vention is fully described in the following specifi
cation in conjunction with the accompanying
drawings wherein:
2
each die being carried by the stationary jaw ill
of a conventional punch press while the movable
members are carried by its movable jaw Il. In
asmuch as a punch press is well known, further
ydescription thereof is unnecessary. It is under
stood, however, that at each actuation of the
punch press the movable jaw II descends a pre
Figure 1 is a perspective of one end of a metal determined distance toward the stationary jaw
strip indicating the several operations to which , III and then returns to its initial position where
the strip is subjected as it advances endwise, a in all of the movable parts ofthe die are above
'
completed contact being shown as severed from the strip.
Two punches I2, I3 which are preferably round
the forward end of the strip;
Fig. 2 is a plan view partly in sectiononline
25 2-2 of Fig. 3 showing the various punching,
forming, notching, shearing, and embossing dies
used in forming this electrical contact from a
strip of sheet metal;
v
Fig. 3 is a partial vertical section on broken
line 3-«3 of Fig. 2;
¿
Fig. 4 is a partial vertical section on line 4-4
of Fig. 2 showing a slitting die;
Fig. 5 is a partial vertical section on line 5_5
of Fig. 2 showing a forming die in operation;
Fig. 6 is a partial section on line 6-6 of Fig. 2
35
showing two forming dies in operation simultane
ously;
Figs. 7 and 8 are two partial sections on lines
‘I-l and 8_8, respectively, of' Fig. 2, showing
40 forming dies in operation, Fig. 8 also having an>
embossing die operating simultaneously there
with; and
Fig. 9 is an enlarged perspective of the finished
electrical contact.
The electrical contact for which my improved
45
method of production has been devised is such as
may advantageously be-employed to receive en
gagement from one of the prongs of a vacuum
tube. As shown best in Fig. 9, this contact C is
pass through suitable guides I4 and coact with
registering openings I5, I6 in a die block I1 which
is carried by the stationary jaw IIJ to form the
holes b', b2. The guide I4 is separated from the
die block I1 leaving a passage I8 through which
the metal strip S may be fed endwise either man
ually, or by means of mechanism not shown, a 30
definite amount at each step. The sides of pas
sage I8 serve also to guide the strip laterally, or,
if desired, other guide means may be used.
A punch I9 which is secured to the movable x
jaw II coacts with a corresponding opening in
the die block. This latter punch is preferably
rectangular in form with a recessed portion which
leaves an ear 20.
At the next operation, when the strip has been
advanced toward the left side of the sheet one
step, the ear 20 is slitted centrally along the
line 2| by means of a punch 22, as shown in Fig.
4, to form the ears d. At the vsame time a
notching punch 23 the center of which is pref
erably in line with the line 2l removes a por 45
tion of the left side of the strip so as to outline
a portion of the lugs b of the finished contacts
b_ut leaving a narrow bar 24 to connect adjacent
contact blanks. For the sake of convenience,
the upper edge of the strip S (Fig. 2) is referred 50
erties, formed to provide a mounting plate a from lto as the right side and the lower as the left`
.
which extends a ñaring terminal lug b of slightly side.
At the next stage, and when the strip has been
increased width, the lug having one or more holes
b', b2 and an embossed button b3; also extending advanced one space, the first forming punch 25
50 made of sheet metal having requisite spring prop-V
55 at right angles from the mounting plate, opposite
serves to bend down the slitted ears 20 to the
9,110,909
position 20'. The lower end of this punch is
forming die through the punched opening in the
rounded to serve as a pilot punch for the entire
intermediate portion to bend down the slitted
ear, bending up two slitted portions from the
right side of the strip including said ears, bend
group.
`
The second forming punch 26 coacts with a
stationary forming die 21, as shown in Fig. 3
to cause the parallel slitted portions 28 to be
bent vertically into the position 28'. A plunger
28 is slidably mounted in the block 21 and is
pressed by means of a spring 30, the spring rest
ing upon a screw 3|. This spring is suillciently
ing said portions toward each other, bending the 5
right hand end of the contact about a first line
parallel to the edge of the strip, bending the
right hand end of the strip` about a second line
parallel to the ilrst line and at the left thereof
so. as to space the two end portions of the con
10
strong to force the edge portions 28'» out of the f tact from each other, and severing the last con
_
die block 21 as the punch 26 recedes. It will tact from the strip.
2. The method of forming contacts of the class
be observed also that the upper surface of the
die block 21 is slightly raised. so that as the described'from a sheet metal strip comprising
strip is advanced it slides up over the surface 21‘. arranging a series of punching and forming dies
Another forming punch 32 serves to curve the in spaced -alignment, the steps in order com
prising punching the left side of the strip in
lug b as shown in Fig. 6 on the curved die sur
what is later one end of the contact, punching
face 21h.
'
' As the strip is again advanced one step, the edge out an intermediate portion midway between two
20 portions 28* of the right hand end -are engaged contacts leaving therebetween an inwardly ex 20
by a third forming punch 33 whose lower surface -tending ear, slitting from the right edge of the
is provided with a V-notch v34. As the forming strip through said ear, simultaneously notching
punch 33 descends it presses the right hand end the left side of the strip, passing a forming die
of the contact down against a stationary block through the punched opening in the intermedi
35 and, as it continues to descend, forces the ate portion to bend down the slitted ear, bend 25
edges 28* inwardly from the dotted line position ing up two slitted portions from the right side
to the full line position 28h, as shown beneath of the strip including said ears, bending said por
'tions toward each other, bending the right hand
lthe punch 33 completing the clip c.
The block 35 is provided with a spring pressed
30 plunger~ 36 similar to the plunger 29. During
end of the contact about a first line parallel to
this forming operation the plunger 36 is pressed
of the strip about a second line parallel to the
down, as shown, against the action of a spring
31, but as soon as the die rises, the spring 31 will
push the plunger 38 up, lifting the right hand
35 end of the formed contact out of the block 35.
As the strip is advanced one more step it
reaches the position shown by the section line
1-1 of Fig. 2 wherein the right hand end falls
beneath a fourth forming punch 38 .which passes
40 between the inwardly bent edges 28h and bends
the clip c down over a ledge 39 until it assumes
the edge of the strip,- bending the right hand end 30
first line and at the left thereof so as to space the
two end portions of the contact from each other,
and severing the last contact from the strip.
3. The method of forming contacts of the class 35
described from a sheet metal strip comprising
arranging a series of punching and forming dies
in spaced alignment, f the steps- in order com
prising punching the left side of the strip in what
is later one end of the contact, punching out an 40
intermediate portion midway between two con
a position 28e substantially at right angles to .. tacts leaving therebetween an inwardly extend
the mounting a of the contact, as shown in ing ear, slitting from the right edge of the strip
Fig. 1.
,
At the next and last stage, as shown by the
section line 8--8, the body of the contact is given
another bend of substantially~90° about a sta
" tionary ledge 40 by means of a ñfth forming
punch 4| carried by the movable jaw Il. At
the same time the body oi' the contact is em
bossed to form the button b3 by means of an
embossing punch 42, as shown in Fig. 3,'coop
erating with a depression 43 in a stationary die
44 which carries the ledge 40.
At the same time the finished contact C is
completed by means of a shear 45 which cuts
away the bar 24 connecting the last contact with
the next adjacent contact as indicated by the
dotted lines 24.
through said ear, notching the left side of the
strip, passing a forming die through the punched 45
opening in the intermediate portion to bend down
the slitted ear, bending up two slitted portions
from the right side of the strip including said
ears, simultaneously bending up the left hand
end of the contact, bending said portions toward
each other, bending the right hand end of the
strip about a second line parallel >to the first line
and at the left thereof so as to space the two
end portions of the contact from each other, and
severing the last contact from the strip.
4. The method of forming contacts of the class
described from‘a sheet metal strip comprising ar
ranging a series of punching and forming dies in
spaced alignment, _the steps in order comprising
punching the left side of the strip in what is later
o'ne end of the contact, punching out an interme
duced economically as regards the material used diate portion midway between two contacts leav
ing therebetween an inwardly extending ear, slit
and the time consumed.
'
ting from the rightedge of the strip through said
I claim:
l. The method of forming contacts of the ` ear, notching the left side of the strip passing a 65
65
60
According to the method of procedure herein
described, the contacts in question may be pro
class described from a sheet metal strip com
forming die through the punched opening in the',
prising arranging a series of punching and form
ing dies in spaced alignment, the steps in or
der comprising punching the left side of the
70 strip in what is later one end of the contact,
punching out an intermediateportion midway
to outline portions of two contacts leaving there
between an inwardly extending ear, slitting from
the right edge of the strip through said ear,
intermediate portion to bend down the slitted ear,
bending up two slitted portions from the right
side of the strip including said ears.' simultane
ously bending up the left hand end of the con- 7
tact about a first line parallel to the edge of the
75 notching the left side of the strip. passing a
left thereof so as tòn’space thel two end portions u
strip,_bending said portions toward each other,
bending the right hand end of the strip about a
second line parallel to the ñrst line and at the
3
dies in'spaced alignment, the steps in order com
prising punching the left side of the strip in
die through the punched opening in the inter
mediate portion to bend down the slitted ear,
bending up two slitted portions from the right
side of the strip, bending said portions toward
each other, bending the right hand end 'of the
contact about a iirst line parallel to the edge of
the strip, bending the right hand end of the strip
what is later one end of the contact. punching
about a second line parallel to the iirst line and
of the contact from each other, embossing, and
`severing the last contact from the strip.
5. The method ' of forming contacts o_f the
class described from a sheet metal strip compris
' ing arranging a‘ series of punching and forming
out an intermediate portion midway between two " at the left thereof so as to space the two lend
portions oi the contact from each other, and cut
tending ear, slitting from the right edge ot the ting out the connecting bar thereby severing the
’
strip through said ear, notchingthe left side of` last contact from the strip.
STEVEN KOBZY.
‘ the strip so as to leave only n. narrow bar con
contacts leaving therebetween an inwardly ex
necting the adjacent contacts, passing a forming
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