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Патент USA US2132113

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@cà 4, 1938@
original Filed may ‘14, 1935
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L, Q, HUCK ,
RIvEjr SETTING mcmxmsü
origami Filed may 14, 3535
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original Filed Mayvm, 193s
5 sheets-sheet 3
Patented Oct. 4,> 1938
Louis C. Huck; Buchanan, Mich., assignor to
Buxon Holding Corporation, a corporation of
original application May 14, 1935', serial No.
21,472. Divided and this application June 22,
1936, Serial No. 86,571
10 Claims. (Cl. 218-19)
The invention relates to a rivet setting mecha
While~ the rivet setting mechanisms set forth
nism and it has particular relation to a mecha,
in these applications for patent have been highly
nism for setting rivets of a type including a tubu
satisfactory, certain improvements have been de- f
lar element and a pin extending therethrough sirable and form the basis of this invention.
These may generally be indicated in the objects
GI and which is inserted and set from one side of the
structure to be riveted.
of the invention but a more detailed explanation .
More particularly the invention constitutes an wm be fourìd in che description. objects of the>
improvement in rivet setting mechanisms over invention additional to those outlined hereafter
those disclosed in the copending applications for will be apparent from this description, from the
patent of Louis C. Huck et al., Serial No. 615,544, drawings to which it relates and from the claims
filed June 2, 1932, now Patent 2,053,718, granted hereinafter set forth.
Sept. 8, 1936, and Louis C. Huck et al., Serial No. ` One object of this invention is to provide a rivet
636,480, tiled October 6, 1932, now Patent setting gun which is more eñicient in operation
2,053,719, granted Sept. 8, 1936. This application
and which may more easily be handled and ma
constitutes a division of my copending application
nipulated by the operator.
Another object of the invention is to provide
for patent, Serial No. 21,472, filed May 14, 1935.
. In the ñrst of the above mentioned copending
rangement therefor which will enable using a
was set forth which included a rivet setting gun
and a iluid pressure boosting device connected
smaller diameter of barrel on the gun and also
thereto by ilexible tubing so that the gun might
be used at points remote with respect to the
booster and without moving the booster each time
the gun would be moved. It also was set forth in
this application for patent that air pressure
an improved jaw mechanism and operating ar
applications for patent a. rivet setting mechanism
would be used in the booster device for building
up a liquid ñuid pressure which would be supplied
to the gun for operating it during the rivet set
ting procedure. Moreover, this rivet setting
mechanism was so designed and constructed that
by manipulating a trigger on the gun, operation
of the booster device and setting- of the rivet
could be controlled entirely by the operator ma
nipulating the gun even though the booster de
vice would be located at some distance away.
facilitate insertion of the jaws during assembly of
the gun.
an improved riveting gun or the like employing
jaws therein, wherein means are provided for
manually opening the jaws.
For a better understanding of the invention
reference may be had to the drawings wherein:
from the left end of Figure 1;
Fig. 3 is a cross-sectional view taken substan
tially along the line 3-3 of Fig. 2;
Fig. 4 is a cross-sectional view taken substan
tially along the line 4--4 of Fig. 3;'
1932, a rivet setting gun of somewhat diiîerent
character is disclosed which also operates in con
tially along the line 5-5 of Fig. 4;
junction with a booster device such as set forth in
tially along the line 6--6 of Fig. 1;.
patent. The gun in the second case includes two
pistons one of which operates ñrst when the trig
tially along the line 'l-l of Fig. 1;
ger on the gun is pulled to eiîect a certain phase
of the rivet setting operation and then upon com
tially along the linefB-B of Fig. 1;
pletion of this phase, the second piston automat
ically becomes operative to cause an auxiliary
anvil to move over the head of the tubular part of
the rivet to radially contract a portion thereof
o into grooves in the pin forming a part of the
rivet. Upon completion of this operation, the
liquid fluid pressure is automatically increased to
such extent that the ñrst piston continues its
movement to break the pin at a predetermined
5 Point.
Figure 1 is a longitudinal, cross-sectional view
of a riveting mechanism constructed according
to one form of the invention;
Fig. 2 is an end view of the mechanism as seen
In the above mentioned copending application
vfor patent, Serial No. 636,480, filed October 6,
E the iirst mentioned copending application -for
Another object of the invention is to provide
Fig. 5 is a cross-sectional view taken substan
Fig. 6 is a cross-sectional view taken substan
Fig. rI is a cross-sectional view takenv substan
Fig. 8 is a cross-sectional view taken substan
Figj9 is a fragmentary cross-sectional view of
a riveting mechanism constructed according to
another form of the invention;
Fig. 10 is a cross-sectional view taken substan
tially along the line llt-l0 of Fig. 9;
Fig. 11 is a cross-sectional view illustrating a
rivet inserted in openings in a structure to be
riveted as seen prior to setting of the rivet; and
Fig. 12 is a view similar to Fig. 11 illustrating
the assembly after the rivet has been set.
Since this application is a division of the co 55
pending case, Serial No. 21,472, the means for
supplying fluid under pressure to the riveting
mechanism herein disclosed has not been in
cluded. The riveting mechanism is connected to
the iiuid pressure supply means solely by means
of two ‘conduits and these have been included
herein and are identified by the numerals 24 and
|23. These numerals correspond to the numerals
identifying the same conduits in the parent case.
10 Conduit 24 supplies liquid which may be subjected
to high pressure during the rivetl setting opera
tion. The conduit |23 4is an air supply line, which
not only supplies air to the riveting mechanism,
but which also provides a means for controlling
15 «the remote pressure developing means through
operation of a trigger on the riveting mechanism.
vReferring now to Figs. 1 and 2, the riveting
gun comprises a cylinder casting |10 having a
thickenedupper portion |1| upon which a han
20 dle |12 is detachably secured by means of bolts
|13. It may be stated at this time that the gun
normally will be used with ythe handle upper
most and the 4latter is so arranged with respect
to the cylinder casting and other parts‘ of the
tured head 200 that is held in the left end of
the cylinder by a threaded sleeve 20|. A seal
ing ring such as mentioned may be provided at
the right side of the head 200 to prevent ñuid
from escaping along the bearing.
At the left end of the tubular portion |98 of
the piston |94, a. head >203 is mounted for re
ciprocatory movement on the piston rod and a
bearing 204 may be provided between it and
the rod,- and this head has a tubular portion
205 slldable in bearing |99, and which abuts
the portion |98 of the piston so that when the
piston is moved to the left, the head 203 moves
The head 203 at its left end terminates in
three radially offset and axially directed legs 206
spaced 120 degrees apart as best shown by Fig. 6,
and these legs are axially movable in recesses
201 formed in the cylinder head 200. Between
the recesses inwardly directed legs 208 are’there
by formed on the head 200, as also shown by
Fig. 6, and it may be noted that the circumfer
ential length of the recesses substantially is the
same as the circumferential length of the legs
gun that a vertical line substantially through the 208. Referring now both to Figs. 1 and "l, axially
center of gravity of the gun will pass upwardly beyond the end of the legs 208,~the head 200
substantially through the center of the handle terminates in a cylindrical portion 209 of larger
so that the operator holding the gun suspended i diameter and this tubular projection has Atwo
from the handle will find the axis of the cylin rslots 2|0 spaced 60 degrees apart and which
30 der substantially horizontal. This adds'to the extend to the outer end thereof. An outer bar
ease with which the gun may be .manipulated rel sleeve 2|2 is reciprocable in the tubular por
and operated. 'I'he casting |10 includes two tion 209 and the inner end of this sleeve at one
bores |14 and |15 separated by an integral wall point is provided with an outwardly directed pro
|16, and a tubular piston rod |18. is journaled jection 2|3 adapted selectively to ñt in one of
35 in a bearing |19 provided in a central opening the openings 2|0. It will be appreciated that
in the wall |16 for reciprocatory movement ax
-the slot 2|0 will hold the barrel sleeve 2 I2 against
ially of the bores. The bearing terminates at turning while permitting its reciprocatory move
its right end in a flange |80 which abuts a ment and that by withdrawing the barrel, it
shoulder |8| on the wall so as to prevent move
may be re-inserted with the projection 2|3 dis
ment of the bearing towards the left, and at posed in the other slot 2|0 thereby positioning
the right of the flange |80 a sealing ring |82 the barrel sleeve in a 60 degree displaced posi
of cup-shaped character is provided so as to . tion. Reciprocatory movement of the sleeve 2|2
positively prevent fluid at the right side of the is additionally guided and supported by a sleevel
wall |16 from ñowing along therod |18 to the 2|4 (Fig. l1) threaded into the end of the sleeve
left side thereof. A piston |84 is rigidly mount
20|, and it will be apparent that sleeve 2|4 will
ed on the rod |18 within the bore |14 and this normally prevent withdrawal of the bari'el sleeve
piston has a sealing ring |85 at its left side and 2|2 by abutment with the projection 2|3 on the
around the rod to positively prevent nuid be
latter. An inner sleeve 2li is reciprocatory in
tween the piston and the wall |16 from ñowing the sleeve 2|2 and the former, as best shown
between the piston and piston rod. 'I'he outer by Fig. 7, has three circumferentially spaced slots
50 periphery of the piston is provided with sealing
rings |86 similar to those mentioned which pre
vent ñuid from flowing between the cylinder wall
and the piston periphery. At its right end, the
piston rod projects through a closure head |81
.55 held
against a shoulder |88 by a ring |89 thread
ed into the end of the cylinder, and the head
|81 has a bearing |90 through which the rod
projects. The inner end of this bearing is ñanged
similarly to the bearing |19 and a sealing ring
is disposed in a recess in the head to prevent
ñuid from flowing between the piston rod and
the head.
In the bore |15 a similar‘piston _ |94 is pro
vided but this piston has an inner bearing |95
associated therewith which may reciprocatev with
the piston on the piston rod |18. This bearing
terminates at its right end ln a ñange |98 and
a sealing ring |91 similar to those mentioned is
70 mounted on the right end face of the piston for
preventing fluid at the right side of the latter
from ñowing between the piston rod and the
bearing. The left side of the piston terminates
in a tubular portion |98, which may reciprocate
in a flanged bearing |9l-secured 'in an aper
2|6 of the same character as the slot 201 shown
by Fig. 6, and these slots receive radial projec
tions 2|1 at the inner end of the sleeve 2|2.
From this description it will be appreciated that
the two sleeves may reciprocate relative to one
another and, with the parts arranged as shown
by Fig. 1, the legs 206 on the head 203 are in4
engagement with the projections 2|1 on the
sleeve 2|2, while the end‘portions'of the sleeve
2|5 between the slots 2I6 are in engagement
with the radial projections 208 on the head 200.
It will now be apparent that if piston |94
moves to the left, it‘will move the head 203 to
the left and the engagement of the .legs 206
on the ~latter with the projections 2|1 on sleeve
2|2 will cause the latter to Vmove to the left.
The sleevev2|5 may remain stationary and in
abutment with the legs 208 on the cylinder head
208 as the legs 206 and 2|1 on the head 203
and sleeve 2|2 may move axially in the slots
2|6 in the sleeve. This arrangement may be -
reversed by removing- the sleeve 2|4 and with
drawing the sleeves 2|2 and 2| 5 and then re
inserting them with the projection 2|3 on the
-outer sleeve dispoœd in the other of the slots 75
for patent mentioned.
such inner gripping surfaces are provided with
grooves for gripping a grooved portion of the
rivet pin. For engaging the tubular_ part of the
rivet, the outer end of the sleeve 2|5 terminates
The outer end of the piston rod |18 has an
enlarged portion reciprocatory in the inner sleeve
in an anvil 231 that has a tubular projection 239,
while the outer end of the sleeve 2|2 terminates
2|5 and a reduced portion 22| threaded into
a tubular jaw operating member 222 that is also
opening 240.
reciprocatory in the sleeve 2|5. The member
222 at its outer end has a conical inner periphery
223 terminating at the end of the member in
short sleeve 24| secured thereon, such as by pins -
2|0, and the reason for this selective arrange
ment is to enable setting yof different types of
rivets as set forth in the previous applications
a circular opening, and as best shown by Fig. 8,
this conical surface has three equally spaced
grooves 224 of cylindrical character with the axis
in anIanvil 239 having a slightly tapered entry
The right and outer end of the sleeve 230 has a
or a split ring 242, and this- short sleeve has an
enlarged bore at its left end containing a coiled
spring 243 abutting the right end‘of the piston`
rod |18. 'I'his arrangement insures movement of
of each cylindrical surface substanti-ally parallel
sleeve 230 with the piston rod |-18 when the lat
to the conical surface.
ter moves to the right, so as to hold the lugs or
ears 229 at the left end of the sleeve at the
These grooves respec
tively receive jaws 225 having outer cylindrical
surfaces seated in and movable along the grooves.
From this it should be appreciated that the jaws
20 m-ay be expanded or contracted by their move
ment along the grooves 224 while still obtaining
full and cylindrical surface contact between the
jaws and the grooves. It will be noted that the
grooves are not greater than semi-circular in
cross section and this is advantageous in that
it permits inserting the jaws through theinner
end of the jaw operating member 222. If the
jaws had to be inserted through the front open
ing at the smaller end oi the conical surface
30 223, a larger diameter of the member 222 would
be required and this in turn would require larger
diameters of the sleeves 2|2 and 2|5 and hence
the barrel of the gun would be larger land could
not be inserted in certain places for riveting.
Each of the jaws has an axial extension at
right end of the slots 228 in the jaws. In set
ting a rivet, breaking of the rivet pin causes the
jaws to move to the right relative to the piston
rod |18, and hence relative to sleeve 230, and
if the lugs 229 were not at the right end of the
slots 228 in the jaws, the jaws might engage the
lugs and break them olî. It may be added that
the length of the slots 228 to the left of lugs 229 25
(as shown in Fig. 1) is _greater than that permis
sible movement of the jaws relative to the piston
-rod and member 222 as governed by the linear
space between the shoulder 232 and the left end
`of the piston rod portion 22|, so -that with the 30
lugs 229 normally maintained at the right end
of the slots 228, engagement of the lugs with the
left end of the slots-upon breaking of the pin`
ordinarily will not occur.
The sleeve 24| enables manual pulling of the
its inner end as indicated at 221 that has a. slot ~ sleeve 230 so as to move the jaws backwardly
228 therein for receiving one of three radial pro
relative to the jaw openings 224.
jections 229 on the outer end of a tubular sleeve
vantageous if the jaws ever freeze in the open
ings, or if it is desired to expand the jaws for
230, which extends entirely through the piston
40 rod in a reciprocatory manner and projects from
any reason.
This isad
the right end thereof. This construction enables
Now referring to Figs. 3 and 4, the casting |1|
manually pulling the jaws to the right relative
to the operating member 222 by pulling the out
at the upper side of the gun, has an opening
244 in communication with the air line |23 and
wardly projecting end of the tubular member
230 and this may be advantageous after the
riveting operation in the event the jaws are un
duly wedged in the grooves 224.
' For normally urging the jaws toward the left,
a sleeve 23| is slidable on the sleeve 230 and is
provided with an annular shoulder 232 engaging
the ends of the projections 221 on the jaws. This
sleeve is urged toward the left by a coil spring
233 engaging the right end of the sleeve and
which is disposed in a recess 234 provided between
the larger portion 220 of the piston rod and the
~tubular element 230. Between the ñange 232
on the sleeve 23| and theend of the piston rod
portion 22|, an annular ring 235 of rubber or
the like is provided for cushioning the jaws when
the rivet pin breaks and when the jaws tend to
quickly move to the right with respect to the
operating member 222 as the result of recoil.
It may be noted here that normally this will be
the action obtained so that the jaws will auto
matically' free themselves from any wedging en
gagement with the grooves 224 as a result of re
coil force when the pin breaks, but in the event
this passageway in turn communicates with an
opening 245 communicating with a valve pas 45
sageway 246. The passageway 246 has a valve
241 therein provided with axially directed pe
ripheral spaces 248 to allow air to flow there
through, and the central portion of the valve is
normally pressed against a valve seat 249 by
means of a spring 250 engaging the valve and
an apertured bushing 25| threaded into the pas
sageway 245. The valve seat 249 has -a central
opening to allow air to pass therethrough when
the valve is unseated, and this opening communi 55
cates with an opening 252 communicating with
the atmosphere. For unseating the valve 241 a
plunger 253 is reciprocable in a head 254 closing
_the left end of the passageway 246, and thisv
plunger, as best shown by Fig. 1, is adapted to
be moved by one end of a bell crank 255 pivoted
on the handle as indicated at 256. The opposite
end of the bell crank is engaged -by a short arm
251 rigidly connected to a trigger 258 that .is
pivoted as indicated at 259 on the handle. Thus,
65 `
when the trigger is raised, the plunger 253 is
moved toward the right unseating the valve 241
this does not occur or for any other reason it is
and this in turn connects the conduit |23 to the
desired to move the jaws to the right relative
to the member 222, the right end of the sleeve
230 may be gripped from the exterior of the gun
and the sleeve pulled to move the jaws.
The inner surfaces of the jaws are generally
atmosphere- allowing air‘to exhaust.
Referring to Figs'. 3, 4, and 5, the passage 244 70
cylindrical with- the axis thereof substantially
coinciding with the axis of the piston rod and
is in communication with the right end of the_
bore |14 and the left end of bore |15 in the
gun. 'I'his is effected by providing 4a longitudi
nal passageway 265, as shown by Fig. 5, extend
ing through the casting |1| at one side of the
2,182,113 `
cylinder bores, and which has its ends plugged
liquid from seeping between the stem, bore, bush
and this passageway is in communication with
the bores` |14 and | 15 by means of ports 266 and
261 and by providing a second port 268, as shown
by Figs. 4 and 5, communicating vwith the right
end bore |14 and with the passage 244. Now, if
the trigger is pulled, the conduitl |23 and the
ing 303 and member 29|.
When the valve stem is moved by liquid pres
with -an opening 301 extending to the cylinder
passage 244 are opened to atmosphere and the
space at the right side of piston |84 and the left
bore |15. For the purpose of preventing move
ment of the stem by a pressure lower than that
'10 side of piston |94 may exhaust to atmosphere.
Conversely, when the trigger is released and the
valve 241 closes, air under pressure may ñow into
tläî space at such sides of the pistons |84 and
Referring also to Figs. 3 and 4, the liquid line
24 is threaded into a bushing 215 disposed in a
bore 216 in the casting |1|, and this bushing
is held against a seal 211 by a threaded bushing
218. l 'I'he bore 216 in turn communicates with
20 an aperture 219, communicating in turn with a
downwardly directed valve bore 280 extending
diagonally into the wall |16 and communicating
with the bore |15 by a smallerv opening 28| and
with the bore |14 at the left end thereof,` as indi
cated'at 282. It may be noted that the sides of
the wall |16 and pistons |84 and |94 are relieved
so as to insure entry of liquid properly at the
adjacent sides of the pistons even though the
latter are at the ends of their strokes. The lower
end- of the bore 280 has an apertured valve seat
283 adapted to be closed by a ball v284 disposed
in a sleeve 285 holding the 'seat in place and
having its upper end enlarged and threaded into
the upper end of the bore 280. A spring 286
in the sleeve presses the ball against its seat
and the upper end of the spring is held by a
cap 281 threaded on the sleeve. At its lower
end, the sleeve has one or more openings 288
sure, it moves past a port 305 that communicates
with an annular groove 3.06 lin the outer surface
of member 29|, and the latter communicates
required to unseat the valve element in the event
any slight leakage occurs past the latter when
it is in closed position, the peripheral surface of
the end portion of the stem -is -provided with
very minute grooves 308 which will allow any oil
seeping past the valve element 294 to iioW directly
into the cylinder. If some means of this char
acter were notprovided it is possible in the event
of slight leakage past the valve element, that
an oil pressure would be slowly built up against
the end face of stem suilìcient to move it and 20
open the valve before reaching a pressure that
alone would be suiïìcient to unseat the valve
As best shown by Fig. 1, the system may be
filled with oil by providing a tapered opening 25
3|0 in the casting |1| and tapered openings 3||
at each side communicating respectively with the
two bores |14 and |15. After filling the system,
the opening 3|0 is closed by means of a tapered
plug 3|2 held tightly in place by means of a 30
button 3|3 on a plate 3|4 that is secured by bolts
3 | 5 to the casting. For the purpose of facilitating
removal of the’plug 3|2, a screw 3|6 may be
threaded thereinto and when screwed downwardly
it may be engaged with the base of the opening 35
3|0 to dislodge the plug and force it upwardly.
Now referring to Figs. 11 and 12, the rivet may
comprise a tubular element 325 having an inter
mediate portion of smaller internal diameter, an
external head 326 and a tubular portion pro
40 283 may pass into the bore 280 at the outside
of the sleeve. Thus, liquid may flow upwardly jecting from the opposite side of the structure 40
from the bore |15 and through the valve, but »to be riveted and which is indicated at 321. The
it cannot fiow in the reverse direction, while rivet pin, which is indicated at 328, has a break
liquid may flow either to or from bore |14 through neck 329 of smaller diameter than the remainder
the bore 280.
_of the pin, a series of locking grooves 330 to
For introducing liquid under pressure to the the left of the break neck, a shoulder head 33|, 45
bore |15 at the right side of piston |94, a smaller a larger left end portionA 332, a head 333, and
opening 290 is formed in a tubular member 29| gripping grooves 334 at the opposite end of the
disposed in a bore 292 and this opening is in pin. A spreader ring 335 is provided on the
communication with the boreI 280 by means of an larger portion 332 of the pin and is adapted to
opening 293. The left end of the opening 290 is increase in size when~ the head 333 engages it 50
normally closed by a small valve element 294 so as to provide a larger part for bulbing the
integral with a stem 295 of larger diameter which tubular portion 321. of the tubular member.
may slide in the member 28|,-and it will be When the rivet is set, the pin is pulled with the'
so that liquid flowing upwardly through the seat
noted that around the valve element 294 the end
face of the stem is of larger diameter to provide
a greater area for the oil to act upon once the
element is unseated from the end of opening 290.
Thestem 295 is urged toward the right to hold
the element 294 in valve closing position by a
strong compressive spring 296 disposed in a. tubu
lar cap 291 threaded into the bore 292, and this
spring abuts the left end of the cap at one end
and -at its other end a flange 300 integral with
a plunger 30| which engages the stem 295. It
will be seen that the'element 294 will not open
until considerable pressure is applied and that
once it opens, the larger area against which the
liquid may act at the end of the- stem 295 serves
70 to hold the valve open even though the- pressure
should drop materially. The member 29| is held
reactionary force applied against the head 326,
and this causes the head 33| ñrst to expand the 55
larger intermediate portion of the tubular mem
ber, then the head 333 acting throughA the
spreader ring 335 causes the tubular portion of
the tubular member >to bulb outwardly into a
head as shown in Fig. 12, and then the head 326
is contracted radially to force metal into the
locking grooves 330 which are then disposed with
in the head, and then further tension on the
pin causes it to break at the break neck 329
then located at the outer side of the head 326.
In setting the rivet, it is inserted as shown by
Fig. 11 and the gun‘is moved into a position
where the pin projects into the jaws 221 and it
will be recalled that the jaws have grooves for 70
receiving the grooves 334 on the pin.» The oper
tightly in position by the cap 291 engaging a ation of the system may now be described. _
collar 302 that in turn engages a bushing 303 ’
Assuming that the 'system is properly filled with
_ abutting the left end of such member 29|. Suit
oil and the air line connections are made, the
75 able sealing rings 304 may be provided to prevent
gun is properly associated with the rivet pin and
this brings the anvil portion 238 against the
outer radial face of the rivet head 326. With
the trigger 258 in closed position, air under pres
sure supplied through the conduit |23 is also sup
plied to the right end of the bore |14 and the
left end of the bore |15 and this maintains the
pistons |84 and |94 adjacent the intermediate
wall |16 of the cylinder casting, it being under
stood that the liquid in the bores at the left side
10 of piston |84 and at the right side of piston |94
is allowed to flow back through the conduit 24.
When the trigger 258_is pulled, the line |23 is
open to exhaust and this also opens the cylinder
spaces in the gun at the right side of the piston
15 |84 and at the left side of the piston |94 to ex
haust. As described in the parent case, opening
the conduit |23 to exhaust by operatingmtkhetrig
ger 258 causes actuation of a booster that‘i'n turn
forces liquid through the conduit 24 and into
20 the space at the left side of the piston |84. This
engage at their inner ends a relatively heavy,
metal inertia ring 354 that in turn engages a
sleeve 355 having an enlarged -end 356 engaging
a spring 351, that in turn engages a shoulder 358
on the rod portion 22|. It will be noted that this
sleeve does not pass through to the other end of .
the piston rod |18.l 'I'he spring 351 normally urges
the inertia ring 354 and jaws forwardly and with
the jaws in the normally operative position shown
a substantial space 359 exists between the end of 10
rod portion 22| and the ring.
'I'he jaws 225 are also and individually urged
inwardly by springs having intermediate coiled
portions 360 -_disposed in slots 36| in the member
222 and each coiled portion is pivotal on a pin 15
362 projecting through the slot. Frontwardly,
the coils have ends 363 extending forwardly in
recesses 364 in member 222, and which terminate
in radial ends 365_projecting through small open
ings 366 in such member and into> axial grooves
causes the piston |84 to move toward the right, 361 in the jaws, respectively. The other ends of 20
carrying with it the piston rod |18 and the jaw the coils have radial ends `368 projecting into
operating member 222. Positive and forceful openings 369 in the jaws respectively, and by
contraction of the jaw members results lockingv pressing against the rear walls of such openings,
25 them strongly to the rivet pin and continued
such ends urge the jaws individually away from 25
movement olî the piston |84 will cause movement the outer end of member 222.
of the rivet vpin while the reactionary force is
applied through the wall |16 and casting |18 and
cylinder head 20D, sleeve 2|5 and anvil 231 to
30 the face of the rivet head 326. The operations of
expanding the tubular member intermediate its
ends and formation of the bulbed head from the
tubular portion 321 of the rivet are then eiîected
in order, and, after formation of this bulbed head,
35 very strong resistance is encountered to further
movementl of the rivet pin and this causes the
liquid pressure in the barrel and in the liquid side
to increase rapidly and when this pressure reaches
a. predetermined amount `governed by the valve
40 spring 296, shown in Fig. 4, the valve element
294 will be forced from its seat and the stem 295
will be movedto the left until liquid may llow
into the cylinder bore |15 at the right side of
piston |94. Then the piston |94 begins to move
to the left moving with it the outer barrel sleeve
When the rivet pin breaks, the large recoil
force tends to throw the jaws back and relative
to member 222, and it is important that the full
force of this recoil not be absorbed by striking 30
of the jaws against rod portion 22|. The spring «
351 is occasionally not enough of a cushion
against such force of the recoil. The ring 355,
however, interposes an inertia force and its
weight is such that the rearward throw of the 35
jaws is slowed up owing to the fact that the jaws
must pick up this weight and carry it with them,
and while the jaws and ring both move rear
wardly, the recoil force is dissipated enough that
ñnal engagement of ring 355 with ,the end of rod 40
portion 22| is not damaging to the jaws or ring.
'I‘he spring ends 365 and 368 do not interfere
with movement` of the jaws and the ends 365
particularly maintain the jaws against turning or
circumferential displacement. 'I‘he ends 368, 45
2 I2 and anvil 239 which forces the latter over the while normally urging the jaws rearwardly, are
rivet head 326 and causes its radial contraction not strong enough to overcome spring 351 so
to force metal into grooves 330 of the pin. Upon '
that the latter normally maintains the jaws seat
contraction of the head 326 of the rivet, resistance ed in grooves 223 in member 222. These ends 368
to movement of either of the pistons |84 and are provided to move the_jaws rearwardly and
|94 will further increase, and this will cause the expand them when it is desired to withdraw an 50
liquid pressure in the system to build up to a point unset
rivet gripped by the jaws, but manifestly it
where the rivet pin will be so tensioned that it will be first' necessary to move sleeve 355 rear
will break at the breakl neck 329. Ordinarily,
when the pin breaks, the recoil force on the jaws
will cause the jaws to move rearwardly and the
broken part to pass rearwardly through the jaws
and through the piston rod and sleeve 230 and
to be ejected from the right end thereof.
If the trigger 258 on the. gun is now released,
air pressure will again be built up in conduit | 23
as the valve 294 will be closed, and air under pres
sure will be built up at the right side of piston
. |84 and at the left side of piston |94, causing
these pistons to return to their‘original positions,
thereby forcing the Vliquid _at their opposite sides
wardly before the ends 368 can perform this func
tion. To move sleeve 355 rearwardly, an expand 55
ing tool 315 may be inserted from the right end
of rod |18, and, while any suitable tool may be
used, it is shown as comprising a tube 316 hav
ing segments 311 separated by slots 318, and a
rod 319 threaded into the tube as indicated at 38|), 60
and which has a tapered head 38| for expanding
the segments. When the segments are expanded
into gripping relation with sleeve 355 by turning
back through the conduit 24. ~ As will be seen in
rod 319 relative to the tube 316, the tool may be
pulled to the right so as to move the sleeve.
Although more than one form of the invention
Figure 4, the liquid at the right >side of piston |94
may flow out of the cylinder bore |15 through the
has been illustrated and described in detail, itA
-will be apparent to those skilled in the art thatk
passageway 28| and past the ball 284 as the lat
ter will be unseated by the pressure on the liquid
due to the air pressure at the opposite side of
various modifications may be made without de
parting from the scope of the appended claims.
the piston,
1. A rivet setting mechanism comprising cyl
inder casing, a piston reciprocable in the casing,
a tubular piston rod extending through both ends 75,
Figs. 9 and 10 illustrate an improved form of
Jaw arrangement in the gun. Here the jaws 225
What is claimed is:
of the casing, a barrel sleeve extending axially
urging the jaws out of engagement with the
from one end of the casing, a jaw enclosing and
operating member in the sleeve and connected to
one end of the rod, jaws in the member, said
jaws and member having cooperating tapering
surfaces, and means extending axially through
the piston rod and engaging the jaws for manu
ally moving the latter, said means extending be
yond the opposite end of the rod -for manual
10 manipulation.
2. A rivet setting mechanism comprising a cas
ing, a tubular piston rod and piston reciprocable
in the casing, a jaw actuating member operatively
connected to the piston rod, jaws adapted to be
contracted and moved by said member, means
extending axially through the rod and engaging
the jaws for manually moving the latter, and
6. In a riveting machine, a jaw actuating mem
ber, a plurality of separately movable jaws, means
for urging the jaws into engagement with .the
jaw actuating member, and other means nor
mally urging the jaws out of engagement with
the member, the first means being more forceful
than the second means.
7. In a riveting machine, gripping means for 10
gripping and moving an element, means movable
relative to the gripping means for applying grip
ping forces to the latter so as to grip and move
the element, means carried by the second means
and normally urging the gripping means into
cooperative relation to said second means, and
means also carried by the second means for urg
resilient means for holding said first means nor
ing the gripping means out of cooperative rela
mally in abutting and engaging relation with the
tion to the second means.
8. In a riveting' machine, a plurality of free 20
20 Jaws.
3. A rivet setting mechanism comprising a cas
ing, a tubular piston rod and piston reciprocable
in the casing, a jaw actuating member operatively
connected to the piston rod, jaws adapted to be
25 contracted and moved by said member, means
extending axially through the rod and having in
terlocking but play permitting engagement with
the jaws vfor manually> moving the latter, and
resilient means for normally preventing play be
tween the jaws and said first means.
4. A rrivet setting mechanism comprising a
piston, a tubular piston rod, releasable gripping
means operatively engaged by the rod at one end
thereof, and means extending through the rod for
,85 releasing the gripping means.
5. In a riveting machine, a jaw actuating mem
ber, a plurality of separately movable jaws, means
for urging the jaws into engagement with the
40 jaw actuating member,-and other- means normally
jaws, a jaw actuating and contracting member,
means urging the jaws into operative positions,
and individual means for urging each jaw towards
inoperative position.
9. In a riveting machine, a plurality of free
jaws, a jaw actuating and contracting member,
means urging the l_laws into operative positions,
and individual means for urging each jaw to
wards inoperative position, said individual means
comprising springs anchored on the actuating
member and respectively engaging the jaws.
10. In a riveting machine, gripping means for
gripping and pulling an element, means for actu
ating and moving the gripping means, means
normally urging the gripping means towards
operative position, means urging the gripping
means to inoperative position, and an inertia
member separate from but movable by the grip
ping means.
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