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Патент USA US2405613

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Aug. 13, 1946.
E, H, SHAFF _
'
2,405,613
APPARATUS FOR SETTING BLIND RIVE'I'S
Original Filed Nov. 5, 1942
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Patented Aug. 13, 1946
2,405,613
.UNITED STATESv PATENT OFFICE
APPARATUS FOR ‘SETTING BLIND VRIVETS
ErnestH. Shalf, Spring Lake, Mich., assignor to
Cherry Rivet Company, Los ,Angeles, Calif., a
corporation of California
Original application November 5_, 1942, Serial No.
464,677. Divided and this application April V30,
1945, Serial No. “591,039
3 Claims.
"This invention relates to blind rivets and vhas
particular reference to apparatus for setting ‘blind
(Cl. 218-19)
2
ther shown in connection with the parts to be
fastened together;
rivets of the type in which the rivet setting stem
Fig. 2 is a fragmentary longitudinal sectional
or mandrel is ‘provided with helical threads
view illustrating the method and means for an
adapted to cut corresponding threads in I-the'rivet 6 plying the rivet;
body as the stem is drawnthrough the rivet in the
rivet settingoperation.‘
-
Fig. 3 is a fragmentary longitudinal ‘sectional
View of the improved rivet with its forming stem
This application is a division of ‘my copendmodi?ed for cooperation with aslightly ,di-?erent
inglapplication Serial No. 464,677, ?led November
form of tool; and
'
5, 1942, now Patent Number 2,385,886, granted 10
Fig. 4is a similar view but showing'therelation
Oct. "2, 1945, which describes and claims a rivet
of the parts after the rivet has been ‘set.
of thecharacter set forth above.
'In my rcopendi-ngapplicationrserial No. 464,677
The rivet assembly comprises two principal
parts, namely, the rivet proper or rivet body and
noted above, there 'is described and illustrated a
its forming stem. The rivet proper consists of a
form of-iblind rivet which comprises a hollow rivet 15 tubular shank '1 having ahead '8 at its outer end.
body ‘adapted to be inserted into rivet holes in
The shank 'T has a smooth axial bore through
sheetaor other devices to which the rivet is to'be
which is inserted a ‘forming stem ;9 having at 1158
attached, with a stem extending through the rivet
inner end a ‘forming head l0 .andat its outer .end'a
body including ‘a portion comprising a forming
section I I specially constructed to permit of a
head, immediately adjacent to which the stem, is 20 ?rm gripping action ‘on the stem. ‘The head in
provided with one :or more helical threads ex-
is'of a diameter adapted to .be entered through
tending outwardly from'the body of the stem and
registering holes l2 in two plates vcl‘ parts A and
adapted, when the stem is :drawn inwardly of the
B which are to be‘fastened together.
rivet :body and partially rotated, to cut correThe for-mingistem 9 is provided near the head
sponding threads in the vrivet body while at the 25 in with a portion I 3 of an external diameter
same time expanding the rivet body radially to
somewhat larger than the internal diameter vof
perform the triple iunctionof enlarging the rivet
the rivet bore and having one <01‘ more radially
body radially to insure ‘tight ?t within the rivet
extending helical ribs 01‘ threads ‘formed thereon
holes, upsetting the innerend of the rivet body to
and operative when the ‘forming stem is with
hold the rivet ‘securely in place, and .to threadedly ‘30 drawn "axially through the shank 1 ‘to exert -'a
engage the stem and rivet‘body to insure retention
radial expansive force upon :the shank which
of ‘the stem within the deformed rivet body.
serves :not only to bind the forming stem in the
‘It is an ‘object of this invention to provide an
shank but also to expand the latter .intolen-gage
apparatus ‘by which the rivet stem may be given
ment with the edges of the holes 12 of the parts
the necessary axial pull and rotary motion to "-
properly set a rivet of the type ‘described and
claimed .in the above noted application.
.Another ‘object of my invention is ‘to ‘provide
apparatus by which the stem of a rivet of the
A and B.
‘In the operation ‘of upsetting the inner ‘end of
the tubular shank '7, a combined axial {and rota.
tional movement is imparted to the forming stem
As will ‘be seen from a comparison-oi Figs.
character described maybe drawn axially relative ill) :9.
1
and
2, the helically threaded portion 113 is in
to the rivet body and simultaneously given the
this operation ?rst moved ‘into intimate ‘binding
rotational :movementnecessary to set the rivet.
engagement with the rivet shank 1, and upon
Another object of this invention is to provide
engagement
between the iorming head ~lllof the
an apparatus of the character described in the
stem and the inner end of the shank ‘l. the con
preceding paragraph where'inthe axial and-rotary 45 tinued
rotational {and axial movement imparted
motions are so coordinated with each other as to
conform with the *pitcho'f the threads on the rivet
stem;
"
-
Other objects and advantages of my ‘invention
will be apparent :from a study ‘of the following
speci?cation, read ‘in connection withthe accom
pany-ing drawing, wherein
Fig. 1 is a longitudinal sectional view through
a tubular rivet and showing its cooperating form
ing member in elevation, the assembly being fur
to :the forming stem [causes the helically ‘threaded
portion l3 to-continue its ‘movement with ascrew
feed during the ‘upsetting operation.
As - a result,
the ‘upsetting is performed inotlonrly becausevo'f an
axial movement imparted to the stem but by a,
rotary screw threading action substantially laug
menting the {force required to be applied axially
to perform the upsetting operation.
Referring now to Fig. 2, I have provided a pre
ferred form of puller for use in applying the
2,405,613
3
rivet. This device comprises a tool'body formed
as a cylindrical casing l4 internally threaded as
at 15 to receive a screw actuator 16. The inner
end of the actuator is provided with a suitable
chuck ll for gripping the outer serrated end of
the forming stem 9. The chuck: jaws are yield
a-bly held. contracted by means of a spring?
rupture by a. shearing action has been found to
be advantageous because it permits of an accu
rate determination of the amount of force nec
essary to be applied to insure best results. It
will be understood that the bent end portion 24
facilitates chucking of the forming stem both
for purposesof axial as well as rotational move
ment.
While I have shown and described the pre
ing cone He. The actuator IB may be rotated in
any suitable way as by means of a squared shaft 10 ferred embodiment of my invention, I do not
desire to be limited to any of the details of con
29 operated either manually ‘or by a suitable
struction
shownand described herein, except as
source of power. The forward end of the casing
or body I4 has a cap 2! apertured for the pas- ' de?ned in the‘ appended claims.
I claim:
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sage of the forming stem 9, and when the actu
i. In an apparatus for setting blind rivets of
ator is advanced to the front end of the casing 15 the type including a rivet body having a shank
the chuck jaws engage with the cap and are
v adapted to be extended through an aperture into
forced rearwardly in the actuating cone l'la to
which the rivet is to be set. and a stem having
permit of insertion and removal of the forming
an-upsetting head at one of its ends and radially
stem. The cap 2| also has formed integral
therewith a concave recess 22 shaped to form 20 extending helical threads on the stem to thread
edly engage the interior of the shank, which
alseatv for‘the head 8'.
'
,
.
comprises
a tool body member, an actuator mem
In applying the rivet, the serrated end H of
ber movable within said tool body toward and
theiormingv stem is inserted into the chuck I1
away from one end of said tool body, means on
otivthelpuller. The rivet assembly is then in
the end of said tool body for engaging the rivet
serted through the alined holes l2 in the parts
pressed plunger l9 cooperating with a contract
A-.and B, and with the concave nose 22 of the
tool; engaging withthe head 8, a rotary motion
i'siimparted to the shaft 20. As the screw i6 is
turned, the end portion H of the forming stem
is gripped by. the jaws offthe ‘chuck H which
are coincidentally forcedzby the contracting cone
[lac-‘tightly into ?rm gripping engagement with
thetstemf i-Au'combined rotational and axial force
is thusimparted to ‘the ‘forming stem and as the
latter. is ‘drawn through the tubular shank‘, the
head ‘.10 thereof is ‘forced axially and simultane
ou'sl'y: rotated ‘so as to’upset the inner end of
theiitubular rivet shank with a rolling motion.
Coincidentally, the threaded portion l3 of the
stem; being‘of an external diameter somewhat
larger‘than the internal diameter of the shank,
forces the latter radially outward into engage
ment with'theedg'es'oi the holes l2~ while at the
same .time‘exe'rtin'g a' binding action between
thdforinirig‘stem and the tubular rivet. The
axial movement‘oi the forming stem through
thetubular:shank‘is-facilitated by the fact that
head when the stem is inserted into said tool
body, means on said actuator‘for engaging the
inserted’ end of the rivet stem, and means for
‘moving the actuator relative to said body with a
combined axial and rotary motion.
2. In an apparatus for setting blind rivets 0f
‘ the type including a rivet body having a shank
adapted to be extended through .an aperture into
which the rivet is to be set, and a stem having
an upsetting headat one of its ends and radially
extending helical threads on the stem to thread
edly engage the interior of the shank,.which com
prises a tool body member, an actuator member
movable within said tool body toward and away
from one end’ of, said tool body, means on the
_ end of said tool body for engaging the rivet head
when the stem is inserted‘ into said tool body,
means on said actuator for engaging the inserted
end of the rivet stem, and means for movingv the
actuator relative to said body with acombined
axial and rotary‘motion, the relation between the
axial and rotary motions of said actuator and
tool body vcorresponding to the 'pitch of the
th‘elpitch of :the ‘threads l5 corresponds to the
threads on said rivet stem.
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pitch" of the threaded portion 13. ,Finally, a
3. In an apparatus for setting blind rivets of
r'everse‘rotation is imparted tonthe driving mem 50 the
type including a rivet body having a shank
ber 20 topermit the chuck ii to be disengaged
adapted to be extended through'an aperture into
‘ iromithe serrated end portion l l of the stem 9.
which the rivetis to be set, and a stem having
' ~ In the embodiment of the invention illustrated
an upsetting head at one of its ends and radially
in-Figs. 3 and 4,, the construction and method
of applying the rivet is substantially similar to 55 extending'helicalthreads on the stem to thread
edly engage the-interior of the shank, which
that above described. . In this instance, however,
comprises a tool body member,;an actuator mem
the outer. end portion of the forming stem is bent
ber movable within said tool body toward and
at right‘ angles, as indicated at 24, for insertion
away from one'end of said tool body, means on
the,
end of said tool body for engaging the rivet
60
outward from the axis of’ an actuator member
head when the stem is inserted into said tool
26; La'I‘he latter, is slidable axially within a casing
body, means on said actuator. for engaging the
21 having at‘ its forward ,end a concave nose por
intoan open-ended socket 25, extending radially
inserted end of the rivet stem, means threadedly
tion;28 vfor receiving the head 8 of the tubular
interconnecting said actuator and said tool body
rivet..jAs in-the case of the pulling device of
Fig;_,2, a combined rotational and axial force is 65 having a pitch corresponding to the pitch of the
threads on said rivet stem-‘whereby relative ro
applied to the actuator 26. Upon the completion
of the-setting operation,'the bent end portion v21!
. tary motion imparted between said‘ tool body and
said actuator will impart an axial movement and
of the forming stem is sheared off as indicated
a rotational movement to saidrivet stem to‘ cause
at 29. Rupture of the forming stem at the end
the
threads onsaid stem to cut corresponding
oi-the riveting operation is desirable in that it 70
providesa de?nite indication to the operator that
tlie'rivet has been headed; and provision for such
threads in the shank of the rivet body.
,. ERNEST
M .
SHAFF.
_ .
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