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NOV- 26, 1946- O
‘E. WQSTEVENS
.
2,411,561 7 ’
BUCKING BAR CONTROL FOR RIVE'I'ING HAMMERS 7
‘Filed Feb. 4, 1944 ’
v 2 Sheets-Sheet l
INVENTOR
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ATTORNEY
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’
Nov. 26, 1946.
E. w. STEVENS
_ 2,411,561
BUCKING BAR CONTROL‘ FOR RIVETING HAMMERS
Filed Feb. 4, 1944
2 Sheets-Sheet 2
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ATTO R N EY
Patented Nov. 26, 1946
2,411,561
UNITED STATES PATENT OFFICE}
I 2,411,561
BUCKING BAR CONTROL FOR RIVETING
HAMMERS
Edward W. Stevens, Detroit, Mich, assignor to
Chicago Pneumatic Tool Company, New York,
N. Y., a corporation of New Jersey
Application February 4, 1944, Serial No. 521,028
11 Claims.
'
This invention relates to riveting apparatus
assemblies fundamentally comprising a ?uid ac
tuated tool and a bucking bar cooperating there
with to set rivets, and more particularly to cer
tain features of automatic bucking bar remote
control mechanism for said tool.
An object of the present invention is to intro
duce an improvement related to the copending
application Serial No. 467,531 of James A. Rob-
erts, ?led December 1, 1942 for Bucking ‘bar con
trol for riveting hammers, which has matured
into Patent No. 2,375,691, granted May 8, 1945.
The invention has a special but by no means ex
clusive application to aircraft riveting tools suita
ble for operation on light sheet metal.
.
(or. 78-48)
2
Fig. 4 is also an enlarged elevation of the
bucking bar mechanism similar to that of Fig. 2
but showing the manual control lever‘in oper
ated position and in released or neutralized con
dition ;
Fig. 5 is a transverse section of the mechanism
of Fig. 4 as taken on line 5—-5;
.
Fig. ‘6 is another transverse section of the same
taken on line 6-6 in Fig. 4; and
Fig. 7 is a fragmentary perspective view of the
manual operating lever of the same mechanism.
In the riveting art- the use of riveting assem
blies of the present kind requires the services of
two operators on opposite sides of the work who
are occasionally hidden from each other, ren
The main object of this invention is therefore
dering each operator incapable of noting directly
to facilitate riveting by providing a bucking bar
the movements of the other. In some assemblies
mechanism for a ?uid actuated riveting hammer
used'before the invention of Roberts in the co
or other tool having direct manual control, with
pending application, the throttle valve for the
improved means governing the height of the 20 ?uid supply was arranged to be under the con
heads of the rivets to be set and operating auto
trol of a single operator, either the riveter or the
matically to stop the hammer when the prede
bucker, who would usually delay commencement
termined height of a rivet has been produced.
Another very important object is to increase
of the hammering operation until certain that
the other operator was ready. Occasionally it
then happened that the hammer was started be
fore the rivet was properly backed up or before
the hammer was inproper operative position,
which in either case would likely result in dam
the, speed and uniformity of the‘ riveting opera
tion by providing adjustable accurate control of
the hammer from the bucking bar mechanism in
such manner as to produce uniformly set rivets
with substantial elimination of» damaged work.
aged Work.
It is also an object to have‘associated with a
pneumatic hammer, a bucking bar mechanism
or assembly provided with a member which not
only governs the height of the heads of rivets
to be set, but positively prevents production of
‘
‘ satisfactory and rapid work, the present inven- I
.
tion is directed to improved means for positively
determining a uniform height of the heads of the
Other objects and the advantages inherent ‘in
the invention and accruing'from its use in ac- '
tual practice will appear more fully in detail as
this speci?cation proceeds.
r
'
'
involved is not onlyaffected by the speed of opera
tion as ensured by effective cooperation between
the two operators, but also by the uniformity in
the height and-quality of the heads on the ?n
ished rivets." If some. rivets are at ?rst not sum
ciently set during operation, necessitating re
Fig. l is a side elevation of a ?uid actuated
hammer in operative position against a Work
7
,
number of rivets are to- be set, the time element '
The invention is illustrated in the accompany
ing drawings forming part hereof and in ‘which:
operating position;
rivets intended to be set.
It is, of course, self-evident that when a large
'
piece with a bucking bar mechanism operatively
connected to the hammer and embodying c‘bn
trol means for determining the height of the rivet
heads intended to be set by the mentioned ap
paratus, portions of the apparatus being shown
in section to disclose details of construction while
the manual control lever is illustrated in active
_
engaged in ‘the work to see each other or to ob
serve any special precautions-in order. to produce
too ?at or small rivet heads even when the buck
ing bar is held adjacent to the work for an un
usually long time.
I l
While the invention of said Roberts is designed
to eliminate the mentioned disadvantages and
facilitate the operation of setting a rivet to such
an extent that ‘it is unnecessary for the‘operators
peated operation to bring them to uniform height
50
with the rest, time is lost, and if set too much,
they are defective and damage has resulted.
The present invention is designed to ensure
that at all times the heads of the rivets will be
set to a uniform height.
- Fig. 2 is an enlarged side elevation, for the
Hence, referring again to the drawings, a riv
most part in section, showing the bucking gbar 55 eting assembly comprises a pneumatic hammer,
mechanism with the manual control lever in ini
tial starting position ready to initiate a cycle of
operation;
‘
‘
generally indicated at 8 of a type favored in the
aircraft industry for setting small aluminumand'
alloy rivets, The hammer assembly includes a
Fig. 3*is an end view of the same device as ' cylinder 9 with an offset rigid handle iii and‘
60 houses a ?uid operated motor provided with a
seen from the right in Fig. 2;
2,411,561
3
'reciprocable piston H and means for directing
pressure fluid alternately to the ends thereof,
while the handle is formed with an air inlet
port l2 and throttle means operating under the
control of a trigger is. The piston ll acts as a
hammer, delivering impacts to an anvil or rivet
set M which extends beyond the front end of the
cylinder for engagement with the work. The
work or work piece, in this instance, is repre
4
unseats valve 24, whereupon air from inlet port
l2 and passage 20 is allowed to ?ow through
bushing 23 and into passage 2| whence it flows
to the motor to initiate operation of the hammer.
Air under pressure is supplied to the inlet
port 12 through a ?tting in the form of an aux
iliary valve housing 30 introduced between the
inlet port l2 and a hose line 3| to facilitate
control of the operation of the hammer by means
sented by a pair of overlapping plates generally 10 of the invention. The auxiliary housing 39 has
indicated at l5 (hereinafter termed “the work”)
which are fastened together by rivets to form
part of an airplane skin covering. Guide holes
are ?rst provided in the work to receive rivets
IS, the same being disposed with preformed 15
heads contacting with the work l5 on one side
thereof and having shank portions projecting
a tubular portion 32 extending into the inlet port
I2 in threaded connection with a bushing 33.
The body of thesame housing 30 de?nes a cham—
,‘ber 34 receiving air from the hose line 31 and
communicating with the interior of tubular por
tion 32 by way of a passage 35. Controlling the
flow of air from chamber 34 to passage 35 is an
auxiliary throttle valve 36, which has a valve
through to the opposite side. According to one
head 31 disposed within chamber 34 while the
method of riveting, anvil or rivet set I4 is pressed
against the preformed head on the rivet While 20 valve stem 38 thereof extends through passage
35 and into a split projection 39 on the housing.
the shank portion is engaged on the opposite
The head 31 of valve 36 is adapted to occupy or
side of the work and during operation set as
engage with avalve seat 49 on the peripheral
shown at I‘! by a bucking bar it of a bucking
edge of passage 35 and thereby cut off the flow of
mechanism generally indicated at l9. When the
fluid
from chamber 34 to tubular portion 32 and
25
hammer is then started, percussive impulses are
inlet port l2. rl‘he supply of air to the hammer
delivered to the work through the anvil l4 and
is therefore under the dual control of the throt
are sustained by the bucking bar it‘. As forward
tle valve 24 and the auxiliary valve 36, either
pressure is exerted by the bucking bar through
or both of which when closed will cut off the
out the operation the reaction of the hammer
blows serves to upset the shank of the rivet, a 30 supply of fluid from the motor and so prevent
operation of the hammer. The two valves 24
?at or oval head being thereby formed on the
and 36 are actually arranged in series and thus
side of the work opposite to that occupied by the
preformed head.
It is important that the skin surface of the
provide the dual control of the operation.
The opening of valve 35 is accomplished by re
work be not marred or scratched by a premature 35 mote control from the bucking bar l8 by means
of a Bowden type ?exible cable 4! extending be
hammer action. Thus care must be exercised
tween the hammer 8 and the bucking mechanism
by the separate operators holding the hammer
19 and made up of a wound sheath 42 and an
and the bucking mechanism that the ends of the
inner wire or core 43 slidable within said sheath.
rivet are initially properly engaged before the
The cable at one end is received in the split
hammer is started. As a matter of precaution,
projection 39 of housing 30 and at its other end
the apparatus is designed to guard against mis
extends through a similar split clamping pro
operation resulting from a lack of such engage
jection 44 on the bucking bar ?tting in a trans
ment by placing the compressed air supply under
verse bore 45 in said bar. Clamping screws 46
the control of both the riveter and the bucker.
‘and
41 in the respective split projections 33 and
The piston I I can therefore not begin reciproca
44 serve to clamp the ends of the cable within
tion until the operators of the hammer and
the two implements. The core 43 is movable
bucking bar mechanism signify by releasing the
air supply that their respective implements are
in effective working position. Important as the
features just mentioned may be for proper opera
tion, it should be noted that it is a prominent
feature of the invention to make it wholly un
necessary for the bucker to observe any special
care in order to produce a uniform height of
rivet head on all rivets set when using the pres
ent bucking bar mechanism.
The air inlet port I2 is part of a pressure ?uid
supply pasageway including passages 29 and 2l
communicating through a bore 22. Within said
bore 22 is a bushing 23 having ports registering
respectively with passages 29 and 2 I . Communi
cation between passages 29 and 2| is controlled
by a trigger operated throttle valve 24 in bushing
23, said valve being pressed by a spring 25 to a
seat 26 between the ported areas of the bushing
and so normally prevents the flow of fluid to the
passage 2! and thereby to the hammer cylinder.
Valve 24 has a stem 2‘! extending upward
through and beyond the bushing ,23, the upper
end of the stem underlying one arm of a lever
28 which is pivotally mounted at 29 within a re
cess in the handle it and is operatively engaged
with the trigger l3. When the trigger is shifted
rearward by the pressure of the ?nger of an
operator the lever 23, rocking upon its pivot 29
‘longitudinally within its sheath and arranged
with one end projecting beyond the sheath,
where it is secured to the stem 38 of valve 36
by soldering, brazing or Welding. The other end
of the same core projects upwardly in a counter
bore 48 in the bucking bar and is capped by a
plunger 49 secured thereto and located in said
counterbore and normally projecting a short dis
tance above the bucking bar. The counterbore
48 is of greater diameter than the bore 45 re
ceiving the end of the cable sheath and forms
a casing for a compression spring 5i surround
ing the cable core beneath plunger 49 and tend
ing to hold the latter resiliently in the raised
initial position shown in Figs. 1 to 3 and causing
a pull to be exerted on said cable core, thereby
maintaining the auxiliary throttle valve in hous
ing 39 normally closed.
The means included in the bucking bar mecha
nism‘or assembly for depressing the plunger and
thereby opening the auxiliary throttle valve to
allow pressure ?uid to enter inlet port l2 from
chamber 34 primarily consists of a manual oper
ating lever 52 preferably formed of sheet metal of
inverted U-shaped cross section with the sides
53, 53 bent down from the top web portion 54 and
terminating in a pair of lugs 55 at the forward
75 end thereof, pivotally mounted in a pair of op
2,411,561
posite side recesses 56 on a pivot pin 51 in the
bucking bar l8. Within the sides 53, 53 of lever
52 is a movable escape or release slide member 58.
This latter is made of a metal strip bent back on
itself to form upper and lower slide strips 59, SI
connected at oneend by a web portion 62 and
shiftably mounted upon a pair of cross rods 63 in
such fashion as to straddle the latter, the slide
member 58 being slidable longitudinally within
.
‘6
latter, a set screw '81 in said post serving to fix
the adjustable screw 85 in any attained position
of adjustment.
Thus, ‘when the'bucker is about to bring the
bucking bar against the rivet ‘It, the ?rst portion 7
of the bucking mechanism which will make con
tactvwith the work as already explained is the end
of the sleeve 14, and although the latter projects
- a distance beyond the working end 75 of the
sides 53 and top 54 of said manual lever. To the 10 bucking bar, it is obviously quite simple for the »
rear or ‘outer end Ell of the manual lever 52 is
bucker to locate said end of the bar on the rivet
?xed an interior guide rod ‘65 extending longi
without loss of time .or exercise ‘of vgreat ‘care.
tudinally forward in substantial parallelism with
When the device is moved toward the work I5
the-‘top and sides toward the pivoted end of the
suf?ciently to bring end 15 of bucking bar I8 into
manual lever and projecting slidably into the 15 actual contact with the rivet as shown in Fig. 1,
rear end or web 62 of the‘ release slide member
the sleeve 14 will be pushed in upon the bucking
through an aperture 66 and supporting a coil
bar against the resistance of spring ‘l1, and when
the operator of said device depresses the manual
lever52 from the position of Figs. 1 to 3 to that of
latter forward. Upon the underside of the lever 20 Figs. 4 and 5, the contact of the lower strip 6| of
is ?xed an inflexible plate 68 serving to assist in
release slide member 58 within or beneath the
retaining the release slide member in place and
manual lever with the plunger or cap 49 will cause
more de?nitely to press upon the upper end of a
the latter to be depressed, and this in turn imme
lever return plunger 69 located in a limited bore
diately opens the auxiliary valve 36 in casing 30
‘H in the bucking bar and provided with a com
of the hammer.
spring '6'! bearing against the rear end of, said
releaseslide member and thus tending to urge the
The trigger operated throttle
pression spring 12 tending to raise said plunger 25 valve 24 having already
been opened by the riv
against said lever plate and thereby raise the
eter, as, already stated, the opening of valve 316
lever to normal starting position in which the
just mentioned immediately allows pressure ?uid
plunger cap 49 upon the cable core 43 is also in
to ?ow to the piston ll of the hammer, and start
normal raised position with the auxiliary throt
'
'
I
30 actual operation of the latter.
tle valve 36 closed.
During
this
operation,
as
the
riveting
rapidly
In the lower strip H of the release slide mem
proceeds, the sleeve is gradually pushed further
ber is an aperture or gap 13 which is adapted to
in upon the bucking bar by the latter following
register with the upper end of the cable cap as in
up the progressive shortening of the rivet until
a manner now to be explained. When the riveter 35
the rivet has been completely set as shown at IT
or hammer operator has placed the hammer 8 in
in Fig. 4. Such rearward movement 'of the sleeve
operative position against the head of a rivet it
and then manually presses the trigger or plunger
13 and thereby opens the throttle valve 24, the
hammer will not begin to operate until certain 40
other conditions are also present.
. -
is continuously transmitted to the release slide
member 58 within lever 52 in opposition to spring
6’! of the. latter and produces a corresponding
rearward travel of said member 58 until the aper
ture “E3 in the bottom of the same begins to regis
ter‘with the cable plunger 49. At this instant the
When the bucker who handles the bucking
mechanism is about to cooperate with the riveter
mentioned plunger, urged by its spring'5l, im
to set a rivet, he places the end of the bucking bar
mediately rises up into the aperture 13 directly
l8 more or less accurately against the shank end 4-5 above the same and by correspondingly pulling
of rivet l6. ‘During this movement a sleeve 14
on the‘ cable core 43, effects instant closure of
adapted to surround the rivet ?rst engages
auxiliary valve 36 in the hammer assembly and
against the work l5 and is resiliently retracted
stops operation of the hammer. The time of sub
upon the bucking bar by pressure until the lat
sequent closure of the throttle valve 24 by release
ter makes contact with rivet it in‘ a manner and 50 of the'trigger l3 by the rivet is of minor impor
for a purpose now to be explained. The men- '
tance in the cycle of operation just described, and
tioned sleeve is slidably mounted on the forward
the two devices are therefore shifted by both op
working end 15 of the bucking bar and has an
erators to a new rivet for setting the same in a
expanded rear portion ‘i6 surroundinga'spring'
new cycle of operation.
7
Tl engaging forwardly at one end against a
The
hammering
operation
is
thus
terminated.
shoulder 18 in said sleeve and rearwardly against
automatically when the front end 15 of the buck
a shoulder 79 on said bucking bar at the other
bar,l8 approaches within a predé'termined dis
end and resiliently urging the sleeve forward to
tance, of the work, I5 and of the front extremity
project beyond end or forward portion 15 of the
of sleeve 14., This-distance, which corresponds
bucking bar.
7
.
60 to the height of the completed rivet, remains uni
To prevent accidental loss or undue displace
form'in successive operations as long, as the ele
ment of the sleeve, a retaining pin at is secured
. ments of the device remain in their adjusted
in the forward portion 75 ofthe bucking bar with
position. To increase (or decrease) the ‘height
the upper end extending into a longitudinal slot
82 in said sleeve and thus limiting movement of 6.5 of thef?nished rivet, the adjustable screw 85 is
turned to a more rearward (or more forward)
the latter to the extent allowed by the pin in said
position in post 84.
,
,
/
.
slot. An aperture 83 in the bottom of the sleeve
A slightly different starting of the cycle is not
affords access in one position of the latter to the
only possible but occurrence thereof is also likely
lower end of the pin when the same is to here
moved for repairs or replacement of parts. Upon 70 to be more or less frequent, for it may well be
that the bucker is ready before the riveter and
the rear of the enlarged portion 76 of the sleeve ‘i4
by haste or misinterpretation of a signal and
is ?xed a screw post 84 in which is mounted an
with .the bucking mechanism in position, may de
adjustable screw 85 adapted to engage against the
press the manual operating lever 52 to open valve
forward end 86 of the release slide member :58 in
36 in the hammer mechanism before the latter
manual operating lever ~52 in all positions of the 75 is
in position and thetrigger is ‘pressed. by “the
2,411,561
riveter to open throttle valve 24. Depressing said
operating lever will not alone cause operation
of the hammer, and will thus not occasion pre
mature movement of any part of the assembly
nor cause damage to the work piece involved, but
actual operation is merely delayed until the riv
eter has the hammer anvil in place on the rivet
8
ated hammer, supply means for conducting pres
sure ?uid to said hammer, a control valve asso
ciated with said hammer for controlling the ?ow
of the ?uid through said supply means to the
hammer, actuating means for said control valve
including a ?exible cable comprising a core and
a sheath surrounding the same, the core being
movable with reference to the sheath upon the
application of pressure to an end thereof having
hammer will operate and the cycle will proceed
10 one actuating portion thereof extending into
and be completed as previously described.
cooperative relation with said valve and having
Manifestly, modi?cations are possible and may
another actuating portion associated with the
be resorted to, and parts may be altered in size
bucking bar and movable with respect thereto,
or form and used without others, within the scope
operable means upon said bucking bar for impart
of the invention as de?ned in the appended
ing movement to said actuating means and there
claims.
by opening said control valve, and a movable
What is claimed is:
releasing member supported upon said bucking
1. A riveting assembly, comprising a ?uid pres—
bar
automatically effective during operation to
sure operated hammer, a bucking bar, said ham
disable
said operable means and release the mo
mer and said bar being carried by separate oper
ators and adapted to engage a rivet on opposite 20 tion transmitting means and thereby cause said
control valve to be closed upon completion of a
sides of the work, and means causing the opera
predetermined'amount
of set upon said rivet.
tion of said hammer to be under the control of
4. A riveting assembly, comprising a ?uid pres
the hammer operator in dependence upon inde
sure operated hammer, a bucking bar, said ham
pendently operable remote control from the buck:
mer and said bar being carried by separate oper
ing bar in order to prevent damaging the rivet
ators and adapted to engage a rivet on opposite
or the work by premature hammer operation, said
sides of the work, supply means for conducting
means comprising a ?rst ?uid pressure control
pressure ?uid to said hammer, a throttle valve
valve and local means associated with the ham
associated with said hammer for controlling the
mer for opening said valve at will, a second ?uid
pressure control valve in series with said ?rst 30 ?ow of ?uid through said supply means, an aux
iliary valve for controlling the ?ow of ?uid
valve and capable of being opened independently
through the same supply means, said valves coop
of the operation of the first valve, and mechani
erating to cut off the ?ow of ?uid to said ham
cal operating means on said bucking bar capable
mer when either or both of said valves are closed,
of becoming automatically effective during oper
local operable means associated with said ham
ation to close said second valve upon production
mer for controlling said throttle valve, actuating
of a predetermined amount of set upon said
means for said auxiliary valve including a ?ex
rivet, said mechanical operating means on said
ible motion transmitting means having one actu
bucking bar acting through a ?exible cable com
ating portion extending into cooperative relation
prising a sheath attached at one end to said
with said auxiliary valve and having another
hammer and at the other end to said bucking bar
actuating portion associated with the bucking
and containing a movable core extending into
bar and movable with respect thereto, operable
cooperative relation at one end with said aux
means upon said bucking bar for operating said
iliary valve and at the other end extending to
motion transmitting means and thereby opening
said hammer.
2. A riveting assembly, comprising a ?uid pres 45 said valve, and a movable contacting member
mounted on said bucking bar for engaging against
sure operated hammer, a bucking bar, said ham
the work in the vicinity of the rivet to be set,
mer and said bar being under separate control
and a shiftable releasing member engaged by a
and adapted to engage a rivet on opposite sides
portion of said contacting member and capable
of the work, supply means for conducting pres
of neutralizing said operable means and releas
sure ?uid to said hammer, a throttle valve asso 50
ing said motion transmitting means and there
ciated with said hammer for controlling the ?ow
by cause the auxiliary valve to be closed upon oc
of pressure ?uid through said supply means, an
currence of a predetermined relative change in
auxiliary‘ valve for controlling the ?ow of ?uid
position between said bucking bar and contact
through the same supply means, said valves coop
ing member caused during operation due to the
erating to cut off the ?ow of ?uid to said ham 55 progressive shortening of the rivet by the produc
head and then presses the trigger l3, when the
mer when either or both of said valves are closed,
tion of a predetermined amount of set upon said
local operable means associated with said ham
rivet.
ber for controlling said throttle valve, actuating
5. A riveting assembly, comprising a ?uid pres
means for said auxiliary valve including a ?ex
ible cable sheath extending between said ham 60 sure operated hammer, a bucking bar, said ham
mer and said bar being carried by separate op
mer and said bucking bar and containing a mov
able core operable at one end as a movable plung
er from said bucking bar and at the other end
erators and adapted to engage a rivet on oppo
site sides of the Work, supply means for conduct
ing pressure ?uid to said hammer, a throttle valve
extending into cooperative relation with said
auxiliary valve, operative means upon said buck 65 associated with said hammer for controlling the
?ow of ?uid through said supply means, an aux
ing bar for moving said core and thereby open
iliary valve for controlling the flow of ?uid
ing said auxiliary valve, and movable means
through the same supply means, said valves co
associated with said bucking bar capable of be
operating to cut off the flow of fluid to said ham
coming automatically e?ective to neutralize said
operative means and release said core in order to 70 mer when either or both of said valves are closed,
local operable means associated with said ham
cause said auxiliary valve to be closed upon com
mer for controlling said throttle valve, actuating
pletion of a predetermined degree of set upon
means for said auxiliary valve including a ?exi
said rivet.
ble motion transmitting means having one end
3. In a riveting assembly, a bucking bar adapt
ed for cooperation with a ?uid pressure oper
75 portion extending into cooperative relation with
2,411,561
.
-
’
9
said auxiliary valve and having the other end
portion associated with the bucking bar and mov~
able with respect thereto, manually operable
means upon said bucking bar including a depress
a
.
10
means for said auxiliary valve including a ?exible
motion transmitting means having one end por
tion extending into cooperative relation with said
auxiliary valve and having the other end por
ible member-mounted in effective position to move a GI
' tion associated with the bucking bar and mov
said other end portion of said motion transmit
ting means to open the auxiliary valve, resilient
able With respect thereto, manually operable
means upon the bucking bar including a depress
means tending to return said depressible member
ible ‘lever pivotally mounted in a position effec
to initial position when released, a movable con
tact member slidably mounted upon said bucking 10 tive to move said other end portion of said mo
tion transmitting means to open the auxiliary
bar for engaging against the Work, and a shift
valve, resilient means tending to return said mo
able releasing member associated with said de
tion transmitting means in closing direction to
pressible member and engaged by a portion up
initial position of said auxiliary valve, a movable
on said contact member in effective position to
contact member including a sleeve slidably mount
be shifted relatively to said depressible member
ed
on said bucking bar, resilient means tending
and neutralize the latter with consequent release
to cause a portion of said sleeve to project be
of the motiontransmitting means and corre
yond the working end of the bucking bar to make
sponding closure of the auxiliary valve upon 00
direct contact with the work, resilient means also
currence of a predetermined relative change in
tending to returnsaid lever to initial position
position between said bucking bar and contact 20 when
released, a shiftable releasing member slid
member due to the progressive shortening of the v
rivet caused during operation by production of a
predetermined amount of set upon said rivet.
6. In a riveting assembly, a bucking bar adapt
ed for cooperation With a ?uid pressure operated
hammer, supply means for conducting pressure
fluid to said hammer, a valve for controlling the
?ow of ?uid through the supply means, actuat
ably lmounted ‘on‘said lever so as to partake of
the pivoting movements thereof and normally al
low the lever upon depression thereof to impart
movement to the motion transmitting means and
thereby cause opening of the auxiliary valve, and
a projecting portion upon said slidably mounted
, sleeve engaging said releasing member at least
in depressed. position of said lever and capable
tion transmitting means having one end portion 30 of neutralizing the effect of said lever in said
depressed position with consequent release of the
extending into cooperative relation with said
motion transmitting means and closure of the
valve and having the other end portion associated
auxiliary valveupon occurrence of a predeter
with the bucking bar and movable with respect
mined
change in relative positions between said
thereto, manually operable means upon the buck_
ing means for said valve including a ?exible mo
ing bar including a depressib-le lever pivotally
mounted in a position e?ective to move said other
sleeve. and bucking bardue to the progressive
shortening of the rivet caused during operation
by production of a predetermined degree of 'set
end portion of said motion transmitting means‘ ' upon said rivet.
‘ '
to openthe valve, resilient means tending to return
8.'A riveting assembly according to claim 7, '
said motion transmitting means in closing direc
tion to initial position of said valve to close the an in which the releasing member is disposed with
in a porticnof, and carried by, the pivotally
latter, a movable contact member slidably mount
mounted lever and has one end thereof directed
ed on said bucking bar, resilient means tending
toward the pivoted end of the lever and engaged
to cause said contact member to'project beyond
by
the projecting sleeve portion serving as a re
the working end-of the bucking bar to make cli
action point for shifting said member.
rect contact with the work,'said depressible le- '
9. A riveting assembly according to claim '7,
ver also tending to be returned to initial posi
in
which the releasing member has‘one vend there
tion when released, and a shiftable releasing mem
of disposed adjacent to the pivoted end of the
ber associated with said depressible lever and
lever and engaged by the projecting sleeve por
engaged by a portion upon said contact member
tion serving as a reaction point for shifting said
in effective position to be shifted relatively to
member,
and in which resilient means carried
said lever in order to neutralize the latter with
by the lever serves to urge said releasing member
consequent release of the motion transmiting
resiliently toward said projecting sleeve portion.
means and closure of the valve upon occurrence
10. A riveting assembly according to claim '7,
during operation of a predeterminedv relative
change in positions between said bucking bar and ‘
contact member due to the progressive shortening
of‘ the rivet caused by the production of a ?nished
settingupon saidrivet.
'
>
>
,
'
»
in which the releasing member normally forms
the means upon the pivoted lever which directly
engages with a projecting portion upon the end
7 of the motion transmitting means,’ and in which
said releasing member has a gap portion which
7. A riveting assembly, comprising ‘a ?uid
pressure operated hammer, a bucking bar, vsaid 60 registers with said projecting portion upon the
end of said motion transmitting means in shifted
hammer and said bar being carried by'separate
operators and adapted to engage a rivet on cp
posite sides of the work, supply means for con
ducting pressure ?uid to said hammer, a throttle
valve associated with said hammer for control
ling the ?ow of ?uid through said supply means;
an auxiliary valve for controlling the ?ow of ?uid
through the same supply means, said valves co
operating to cut off the ?ow'of ?uid to the ham
mer when either or both of said valves are closed,
local operating means associated with said ham
mer forcontrolling said throttle valve, actuating
- position of said releasing member, said gap por
tion releasing said motion transmitting means
and allowing the same by entrance of the project
ing end thereof into said gap portion to return to
'initial position and close the auxiliary valve.
11. A riveting assembly according to claim 7,
in which stop means are included for limiting
movement of the sleeve to a predetermined range,
and in which the projecting portion on said sleeve
includes an adjustable abutment member.
EDWARD w. STEVENS.
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