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Патент USA US2115186

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April 26, 1938.
2,115,186
G. F. YAGER
BROACHING MACHINE
Filed May 6, 1955
3 Sheets-Sheet 1
m mwm
GEORGE F. YAGER
.
'
"A TTORNE’S
April 26, 1938.
'
'
G F, YAGER1
2,115,186
BROACHING MACHINE
Filed May 6, 1935
3 Sheets-Sheet 3
IA! VENTOR
GEORGE F. YAGER
Patented Apr. 26, 1938
2,115,186
UNiTED STATES Parser orrlcs
2,115,186
BROACHING MACHINE
George F. Yager, Toledo, Ohio, assignor to The
Bunting Brass & Bronze Company, rl‘oledo,
Ohio, a. corporation of Ohio
Application May a, 1935, Serial No.’ 20,104
21 Claims.
This invention relates generally to breaching
apparatus and refers more particularly to im
provements in broaching machines of thegen
eral character disclosed in my Patent No. 1,962,
5. 674, dated June 12, 1934.
'
(01. 90-—33)
View through a portion of the construction shown
in Figure 1;
Figure 3 is a sectional view taken on the line
3—3 of Figure 2; and
v Figure 4 is a fragmentary sectional view illus~
Qne ‘of the principal objects of this invention
is to materially expedite production and reduce
trating a slightly modi?ed form of construction.
In general, the broaching machine selected for
the cost of manufacture of bushings or like mem
tofore though possible with breaching machines
the purpose of illustration, comprises two opposed
broaching assemblies A and B mounted upon the
frame of the machine for movement alternately 10
into and out of operative relation with the bush
ings supported therebetween. vIn the present in—
of’ the type employed for this purpose in the past.
Another object of the present invention resides
15 in‘the provision of a broaching machine having
a pair of broaches operable to respectively rough
tion to the assembly A, and each of the assem
blies is provided with a reciprocable crosshead 15
C carrying a plurality of pairsof broaches D. In’
bers, by providing a b-roaching vmachine rendering
10 it possible to fashion a relatively great number
of bushings in a shorter length of time than here
ly fashion the interior surface of each bushing,
and to thereafter fashion the interior of each
bushing to the proper size. In accordance with
stance, the assembly B is identical inrconstruc
the present illustrative embodiment of the inven
tion, each of the assemblies is provided with two
pairs of broaches D, although it will be under
2 the present invention, production is materially
stood as this description proceeds that addi
increased by providing the machine with a p1u~
rality of pairs of broaches of the character pre
viously set forth, and by providing means operae
ble in timed relation to the operation of the
.25 broaches to successively introduce a bushing into
registration with the broaches of each pair.
Another advantageous feature of the present
tional pairs of broaches may beprovided without
invention resides in the provision of a work holder
having means for transferring a bushing blank
so from the source of supply to a position in regis
tration with one of the roughing broaches and
having additional means operable in timed rela
tion to thecompletion of the function of the
roughing broach to transfer the bushing into reg
35 istration with the cooperating'?nishing broach.
A further object of this invention resides in the
provision of a work holder comprising a pair of
bushing engaging clamps for each pair of
broaches and movable during the operation of the
40 broaches to locate one clamp of each pair in reg
istration with a loading station and to locate
the other clamp of each pair in registration with
one of the broaches of each pair to receive‘ the
bushing fashioned by the latter broach. This
45 arrangement also appreciably increases produc
' tion, since it reduces to the minimum the time
interval required for each cycle of operation of
the machine.
The foregoing, as well as other objects, will be
,5!) made more apparent as this description proceeds,
especially when considered in connection with the
accompanying drawings, wherein:
Figure 1 is a plan view of the machine con
55
structed in accordance with this invention;
Figure 2 is a fragmentary longitudinal sectional
N0
departing from the spirit and scope of this in- I
vention. Also, ‘in accordance with this invention
the upper broach of each pair operates to per
form the rough out upon the bushing blank, while 25
the lower broach of each pair is for the purpose
of performing the ?nishing operation on each of
the bushings.
.
g
'
Each of the broaching assemblies A and B is
also provided with a work holder, designated gen- 30 .
erally herein by the reference character’ E, and ’
having a plurality of pairs of clamps F corre
sponding in number and spacing to the pairs of
broaches D of each assembly. The work'holders
E are mounted for vertical sliding movement 35
with respect to the broaches, and the clamps F ' ‘
are each provided with cooperating jaws normally
yieldably urged in directions toward each other
to grip a bushing therebetween, in a manner to
be more fully hereinafter set forth. Brie?y, each 40
of the pairs of clamps F is provided with an '
upper clamp G and a lower clamp H having cen
ter distances predetermined to correspond exactly
to the distance between the axes of the associ
ated pair of broaches, so that the bushing in the 45
lower clamp will assume a position in ‘alignment ‘1
with the associated ?nishing b-roach at the time
the bushing in the upper clamp is aligned with
the cooperating roughing broach. It ‘will, of
course, be understood that the axes of each pair 5Qv
of broaches lie in a common vertical plane in- ’
cluding the centers of the clamps associated with
each pair of broaches, and in the present in
stance, the clamps register withthe broaches in
the lowermost position of the holder E. Each 55
3
2,115,186
quired to force a bushing to be broached into the
same. By reference to Figure 2, it will be noted
that the sleeves K are provided with annular re
cesses 25 adjacent the inner ends thereof for re
ceiving suitable stops 26 for the inner ends of the
bushings. The stops are in the form of collars
having a sufficient internal diameter to permit
the inner ends of the broaches to be extended
therethrough.
10
'
It has been previously stated that means is pro
vided herein for successively introducing bushings
from a source of supply into registration with the
broaches of each pair. This is accomplished here
in by providing each of the broaching assemblies
15 A and B with a work holder E‘ mounted for sliding
movement in a substantially vertical plane on the
bolster 22. As shown particularly in Figure 1, the
work holder E for the assembly A is disposed be.
tween the stripper plate 20 of the latter assembly
v20 and the adjacent side of the bolster, while the
work holder E for the assembly B is located in a
similar position. Both of the holders are identi
cal in construction, and accordingly, only one will
be. described in detail.
25
As previously stated, the work holder E com
prises the two pairs of clamps ‘F supported in
such a manner that when the work holder is in its
lowermost-position shown in Figures 2 and 3, the
upper clamps G of each pair register with the
30 roughing broaches l6, while the lower clamps H
of each pair register with the ?nishing broaches
l1. Each of the pairs of clamps F are identical,
and in the interest of simplicity, only one pair will
be described. In detail, the lower clamp H com
35
prises cooperating gripping jaws 30 carried by
arms 3| having outwardly bowed portions inter
mediate the ends de?ning a space 32 of substantial
area and having portions adjacent the upper ends
pivotally supported between the plates 33 of the
40 holder, by means of the pins 34.‘ As will be ob
served from Figure 3, the upper extremities of the
arms 3| project above the. plates 33 and are nor
mally urged outwardly into engagement with ad
justable stops 35, by means of coil springs 33 sup
45 ported by the plates 33 in a position to engage the
arms 30 at points below the pivots 34. The ar
rangement is such that the springs 36 co~act with
the arms 3| to yieldably urge the cooperating
gripping jaws 30 in directions toward each other,
50 and the extent of inward movement of the jaws by
the springs is determined by the adjustable stops
35. In the present instance, the stops 35 are ad
justed to not only insure effectively gripping a
bushing between the jaws 30, but at the same
55 time to provide the clearance between the jaws
necessary for the passage of the broaches when
the holder E‘ is moved vertically with respect to
the broaches.
.
'
The upper clamp of the pair previously de
60 scribed is also provided with cooperating gripping
jaws 31 housed within the space 32 de?ned by the
arms of the lower jaws 30, and also having arms 38
projecting upwardly between the plates 33 and
pivotally supported on the latter by means of the
65 pins 39. The extreme upper ends of the arms 38
are normally urged outwardly by means of a coil
spring 40 into engagement with adjustable stops
4| similar in construction and purpose. to the stops
35. In other words, the stops 4| are adjusted to
70 permit the required inward movement of the jaws
75
The extent of vertical stroke of the work holder
E’ is equal to the distance between the axes of
any one pair of cooperating broaches and the
means for reciprocating the holder in timed rela
tion to the operation of the broaches is prefer
ably the same as shown in my above identi?ed .
patent. It will, of course, be understood that
inasmuch as the broach assembly B is being with
drawn as the broach assembly A is advanced; the
tool holder of assembly A necessarily operates out
of phase with the tool holder at assembly B. In
other words, the tool holder at assembly A is re
ciprocated in timed relation to the operation of
the broaches of assembly A, while the tool holder
at assembly B is operated in timed relation to the
reciprocation of the broaches at assembly B. The
foregoing will be more readily apparent upon con
sidering Figure 2, wherein the work holder E of
assembly A is shown in its lowermost position with
the clamps of each pair in registration with their
respective broaches, and wherein the work holder
of assembly B is in its uppermost position with
the lower clamps registering with the roughing
broaches I6, and with the upper clamps register;
ing with the transfer plungers I at the loading
stations.
The loading stations merely comprise the trans
fer plungers I and the associated bushing supply
chutes J. The delivery end of each loading chute
25
cut, and since the particular construction of the
chutes forms no, part of the present invention, the
same will not be described in detail. It will be
noted, however, that the transfer plungers I are 35
secured to the crossheads C for movement there
with as a unit, and the length of these plungers is
so determined that they do not engage the bush
ings in the chutes until the bushings in the top
clamps G are actually transferred into the sleeves
K, or until the clamps G have assumed their
uppermost positions in alignmentv with the trans
fer plungers.
,
Referring now to the operation of the broach
ing machine described above and assuming that 45
the several parts are in the positions thereof
shown in Figure 2, or in other words, assuming
that the crosshead C has been moved inwardly
a su?icient distance to transfer the bushings
from the uppermost clamps G of the assembly A 50
into the aligned sleeves K. During the aforesaid
movement of the crosshead C of assembly A, the
bushings in the lower clamps H are broached by
the ?nishing broaches I1 and the broaches of as
sembly B are being returned to their outermost 55
or inoperative positions. As} soon as the bushings
in the top clamps G of assembly A are trans
ferred into the aligned sleeves. by the inward
movement of the roughing broaches IS, the
work holder E of assembly A is moved to its .60
uppermost position wherein the clamps G regis
ter with the transfer plungers I, and wherein
the‘ lower clamps H register with the roughing
broaches Hi. In this connection, attention is
called to the fact that the aforesaid upward 65
movement of the work holder is effected at the
time the bushings in the clamps H are held into
engagement with the backing members or stops
50 carried by the bolster 22, so that the clamps
H may be snapped out of engagement with the .70
bushings without displacing the latter. When
the upper clamps G of assembly A are moved into
I
20
is positioned tovregister with the transfer plungers 30
at the same time provide the clearance between
the jaws 31 necessary for the passage of the
broaches upon vertical displacement of the
'
15
in the same manner as in my above identi?ed pa_t—
by the spring to effectively grip the bushing and
holder E.
10
registration with the transfer plungers I, the lat
ter have been moved a su?icient distance inwardly
to engage the bushings in theadjacent chutes J,
4
2,151 5,186
'so- that :upon continued inward movement‘ ofithe ' theibroa'ch toward the ‘sleeve to transfer the “'
? lbroaches of assembly A,1bushing blanks are trans
member from the work‘holder'into"saidsleevei
2..In a‘machine for breaching bushings. and“
ferred' into the upper’ clamps G; Upon com
pletion of. the breaching. operation; of assembly like members‘; a pair of breaches mounted; for
reciprocation, a pair of movableworkiengagi‘ng _
'.A,;the broachesiD'arer returned to'theirrouter
fmost ‘positionswith the result that the bushings clamps ‘operable in oneposition- to hold amemév
' broached by" theiroughing broaches- l6‘are-with~ 'ber. t'ov'be broached. in registration with. eachof
'saidbroaches, a ?xture supported in alignment
‘ [drawn by the, latter‘ from the sleeves Kiinto
the registering/lower vcIarnps'I-I. and as 'soonlras‘
withrone of "the broaches for receiving the'mem-g 7 her in"the"'associated work’engaging clamp; upon 10
'holder E7 of: assembly A‘ is‘ moved to its lower- . movement of thebroaches in directions; to. en- 7
the broaches'have been completely'withdrawn'th'e
gage the'member's in the work engaging clamps‘;
in the clamps G with the roughing broaches I6" meanslcarryingVsaid'clamps ‘operable duringthe
and to’ register the previously broached bushings _ breaching operation ftojmove the clamps ‘in ‘a
in thelowericlamps' H with the’ ?nishing breaches‘ direction‘ to vdisalign the clamp opposite the ?x?‘
' most positionto register the new bushing blanks
All; ‘It will, of course, be understood that during
' ture from thevass'ociate'd broachranditoalign the"
thev interval the breaches of assembly A" are ' other clamp‘ with saidj?xture, andv mean'sfopen
movedtoltheiroutermost positions, the bushings ' [able'upon withdrawal’, of. ‘the broaches to strip‘ -
_ '
v - r?rnished'iby thebroaches [1' are stripped from >
the member from the last named broach into the 5'
‘ 1
last mentioned ' clamp.
'
> 'f
l
20,
1 20' the latter by the plates 20 and permitted .‘to fall
_ . by [gravity into; any 'siutable‘ container "(not ' 7' 3.‘ In aimachine forjbroaching bushingsgand I n a V
'
shownlt ' Incidentally, the 'locationofn the stripe ‘ like ‘members, a broach mounted-for?rreciprocae
_ >
ping plates 20 issuch-as to-also strip the. bushings ' _tion in ‘the direction of its axis,‘ a ‘second broach
from’ 'theqroughing broaches l6 upon outward’
spaced from the broachaforesaidgand also mount-v _
i 25. movement'fthereof; to insure positioning'vthe‘ bush- ‘ f red‘ for‘ reciprocationjas a *unitl'with; the first
.
;
ij-ingsin- the lower’clamps H. Althoughjthel win V broach,.:a pair’, ofgmoyablelworkfholdingclamps,
' strumentalities of assembly ‘B perform their
operable inionefposition to register a member'to
'operationsrat'a different time than, the corre-‘ bebroached with each of said broaches’fonem, ‘
sponding instrumentalities of'passembly JA, jnever easement by the latterjjupon' movement ofi-thea '‘ '
thelessf; these *5 operations are exactlyv the; same isame in onedirection; a :?xt'urej{supportedv in
' and, .ftherefore, _a' detailed description" 'of the 7
alignment with _ the “?rst broach. ' tonre‘ceive the
function ofgassembly Bis believed unnecessary;
l
member in the associated clamp uponmovement
of lther'?rst broachv in aydirection,towardjsaidr
Referring now to ?the-ymodi?cation illustrated‘
m Figure 4,. itjwill
so;
noted" that'the lessential 7 clamp and forfholdingpthe member: during-the“
breachingv operation,>means carrying the‘ clamps ‘
operable duringthe breaching operation-to move t
between this embodiment of the in- "
21735 ‘difference.
.vention and the'one'prev’iously. describedis that ‘
ithegsleevcs‘K are eliminated-and ‘the bushings .
are broached’ while heldgin abutting relation ‘to,’
the clamps in a; direction tov disalign ‘the clampl
} associated with the ?rst broach fromthe latter
the bolstenf Inasmuch as considerable thrust is V and'to ralignrrthe other» clamp with theI?-rst,
exerted upon the’ bushings during’ the breaching ' broach, andv means operable uponjwithdrawaljiof
7’ operation; the work-holder E'f Tand" associatedf ' the breaches to strip the'wmembers "fromybothil;
clamps;_may§ be'moved in the samelmanner as" . broaches andtoyposition the member on the’ first;
"broach into the registering-clamp, said" clamp
tions. of the bushings. In other words; as the carrying means also operable upon completion-of‘
*fw‘ork holder E'ds-inoved upwardly during; the the stripping operation to move .the clampstd
' previousl'ygdescribed without'disturbing/ethe posi- ‘
breaching, { operation, the clamps G7 ‘and. H’
merely
snap._ out
offengagement
withtheir
re
.
v
,
l
7
their original position‘ aforesaid whereinqthe
7 member
f spect1ve-bush1ngs,and thelower clamps H’ snapw
' 3750
into engagement 5 with the: bushings being
broached by the roughing breaches l6”; " With
operated
onilby, the i?rst
members'a
loadingr'staltion,
ar?xture
adapt
'1like
ed
4.to
Inreceive
a machine
arrmember
:forQbroachin]
to: be broachedlandtor
bushings
and‘; .1 r‘
the above; exception, thev above: modi?ed form of ;
I ' const-ruction'operate's in the same manner as
previously
'
'
'
'
" " ‘
broach islaligned
withtthelsecond
broach.~
_ ‘e j
'
hold-the memberduring thejibroaching'operation,
v
V
' j the-onepreviously described-and; consequently," - a pair of- movable clamps inoperable; in ‘one jpo's’i
'
*thisfrnodi?cationwill‘notbe described in detail,“ .tion to align one of the clamps‘ with the ,?xture,
.
55
'
From’ the-ioregoingi it will be observedfthat' I a broach'supported in alignment with the?xture ‘ 55
have provided‘; a bro/achinggmachine which is ' for-movement towardand awayirom'themember
' "completely automatic _.in operation and which‘ is‘ ‘in the clamp, aligned withythe ?xture-said broach
' capable atroughing andj?nishing a pluralityo'f a ‘
' bushing blanks simultaneously; It 'will further,
1 to ’ be apparent that- the, ‘means’ for "transferring '
V pbushings'fromthe source Voffsupply and for vsucl
fcessively registeringtthe bushings with-the several
operable upon movement towardrthelatter clamp l
p l
prior
to’ transfer
to-broaching
the member
said member,
therein’ainto
second
the broach
?xture
supported in alignment With'the other clamp and , ‘
V
movable as a' unit with the first broachkmeansff
broaches junction: during the broacliingrioperaér ' carrying- the‘ clamps'operable during the broacha
:" tions. so’ that the time, interval requiredto com
pletely broacha- s'i'ngle bushing'isreducedjto the
minimumf
I
7'
f
;
l
WhatI claim aswmyinv'ention is}:
'
a
V '
,
ing operation trojmove‘the clamps toar'polsition;
' wherein the clamp’ for the: second broachlrpiregis-
V
’ ' tersiwith the first broach'and the clamp‘for the . " V 7
"1.1In‘a machineffor broaching'bushings and
V I like members, a sleeve adapted to‘receive ‘a mem
‘her to‘, be broached and to hold said’ member
during theibroaching operation, a work holder
latter registerswith‘the loading station; means '
operable upon continuedioperation of the breach' es" to transfer a 7 member from‘ the loading sta
tion into the clamp“ associated" therewith, and
~ havingypmeans for holding a- member to be
means operable independence upon return move}
Y broachedrin" alignment ‘with saidsleeve, and a
broachi'also supportediin alignment with the
the broaches andtoposition the member-ion the
7 n,
mentof the broaches to; strip the members from ; '
into
hingclamp.
bushings‘fand
V. _ _
>75 1
_sl‘eeve‘for movement'toward andwaway from the ' ?rst broach
7
_ the registering
latter and‘ operable" upon initial‘ movement- of a 7,75. In aimachme for brroac
2,115,186
like members, a loading station, a ?xture adapt
ed to receive a member to be broached and to
hold the member during the broaching opera
tion, a pair of movable clamps operable in one
position to align one of the clamps with the ?x
ture, a broach supported in alignment with the
?xture for movement toward and away from the
member in the clamp aligned with the ?xture,
said broach operable upon movement toward the
10 latter clamp to transfer the member therein into
the ?xture prior to broaching said member, a
second broach supported in alignment with the
other clamp and movable as a unit with the ?rst
broach, means carrying the clamps operable dur
ing the broaching operation to move the clamps
to a position wherein the clamp for the second
broach registers with the ?rst broach and the
clamp for the latter registers with the loading
station, means operable upon continued opera
20 tion of the broaches to transfer a member from
the loading station into the clamp associated
therewith, and means operable in dependence
upon return movement of the broaches to strip
the members from the broaches and to position
25 the member on the ?rst broach into the register
ing clamp, said clamp carrying means operable
in dependence upon completion of the stripping
operation to return the clamps to their original
aforesaid positions.
30
6. In a machine for broaching bushings and
like members, a loading station, a pair of work
engaging clamps for holding the work to be
broached, a pair of broaches movable into and
out of engagement with the members supported
35
by the clamps, means carrying the clamps op
erable during the broaching operation to move
the clamps to a position wherein the clamp as
sociated with one of the broaches registers with
the loading station and wherein the clamp asso
ciated with the other broach registers with the
aforesaid broach, and means operable in depend
ence upon movement of the broaches in a di
rection away from the clamps to strip the mem
bers from the broaches and to position the mem
ber on the ?rst broach into the clamp registering
therewith.
50
7. In a machine for broaching bushings and like
members, a loading station, a pair of work engag~
ing clamps for holding the work to be broached, a
pair of broaches movable into and out of en
gagement with the members supported by the
clamps, means carrying the clamps operable dur
ing the broaching operation to move the clamps
to a position wherein the clamp associated with
55 one of the broaches registers with the loading sta
tion and wherein the clamp associated with the
other broach registers with the aforesaid broach,
means at the loading station operable in timed
relation to the movement of the clamps to the
aforesaid position to transfer a member from the
60
loading station into the clamp registering there
with, and means operable in dependence upon
movement of the broaches in a direction away
from the clamps to strip the members from the
broaches
and to position the member on the ?rst
65
named broach into the registering clamp.
8. In a broaching machine, a bolster provided
in one side wall thereof with a work holder and
a work stop, said holder and stop being substan
tially in vertical alignment, work holding means
movable vertically beside the wall aforesaid of
the bolster to points opposite the work holder
and work stop, means including a loading plung
er for transferring work from a suitable source
75 to said holding means, a broach of one type ini
5.
tially engageable with work in the holding means
when it is opposite the work holder, and another
type of broach subsequently engageable with the
work when it is opposite the work stop.
9. In a broaching machine, a bolster provided
in one side wall thereof with a work holder and
a Work stop, work holding means movable be
side the wall aforesaid of the bolster to points
opposite the work holder and work stop, means
including a loading plunger for transferring work 10
from a suitable source to the holding means, a
broach of one type initially engageable with work
in the holding means when it is opposite the work
holder, and another type of broach subsequently
engageable with the work when it is opposite the .15
work stop, and means for moving said plunger
and two broaches in unison toward said bolster
so that the work at the transfer and two broach-v
ing points respectively will be engaged simultane
ously by the plunger and two broaches.
’ 2,0
10. In a broaching machine, a bolster provided
in one side wall thereof with a work stop aper
tured for the passage therethrough of a work
engaging broach, a work stripper plate spaced
from said side wall of the bolster, a work engag
25
ing broach movable through said stripper plate
and work stop, and work holding means mounted
for vertical movement between the bolster and
stripper plate in timed relation to the work en
gaging broach, said means being provided with .30
vertically spaced work gripping means adapted
upon vertical movement . of the work holding
means to alternately position work in line with
the work stop for engagement by the broach
aforesaid.
35
11. In a broaching machine, a work holder
having substantially parallel plates, upper and
lower clamps, the lower clamp comprising cooper
ating gripping jaws having upwardly extending
arms between said parallel plates, portions of said .40
arms adjacent said jaws being outwardly bowed
and de?ning a space of substantial area, portions
of said arms adjacent their upper ends being
pivotally connected to said parallel plates, the
upper extremities of said arms projecting above 45
said parallel plates, coil springs carried by said
parallel plates below the pivots for the arms and
urging the upper extremities of said arms apart
so that the jaws will be moved toward each other,
stops for the upper extremities of said arms, said
stops being adjustable so that the movement of
the jaws toward each other may be varied, the
upper clamp having cooperating gripping jaws
housed within the space de?ned by the arms of
the lower jaws, said last mentioned jaws having 55
upwardly extending arms between and pivotally
connected to the parallel plates at points be
tween the arms of the lower jaws, the upper ex
tremities of the arms of the upper jaws project
ing above said parallel plates, a coil spring be
60
tween and urging the upper extremities of the
arms of the upper jaws apart, and adjustable
stops for the upper extremities of the arms of
the upper jaws.
12. In a broaching machine, a bolster member 65
vhaving openings in opposite side walls thereof for
the reception of reciprocating broaches, sleevesv
?xed in said openings and having tapered inner
surfaces, work clamping sleeves engaging said
tapered inner surfaces, the internal diameter of
each work clamping sleeve being slightly less than
the external diameter of the work to be broached,
the side walls of said work clamping sleeves be
ing provided with circumferentially spaced slots
permitting slight expansion of the said sleeves,
2,115,186
7
arms extending upwardly between and pivotally
mediate their ends to said members, the lower
connected intermediate their ends to said mem
bers, portions of the last mentioned arms being
arms extending upwardly between and pivotally
bowed to receive therebetween the jaws of the
upper clamps, adjustable stops for the arms of
the upper jaws, means for maintaining said arms
against said stops, adjustable stops for the arms
of the lower jaws, and means for maintaining the
last mentioned arms against their stops.
21. In a machine of the class described, a work
holder comprising a pair of spaced supporting
members, and upper and lower clamps suspended
from said members, the upper clamps having
cooperating jaws provided with arms extending
15 upwardly between and pivotally connected inter
clamps having cooperating jaws provided with
connected intermediate their ends to said mem
bers, portions of the last mentioned arms being
bowed to receive therebetween the jaws of the
upper clamps, adjustable stops for the arms of
the upper jaws, yieldable means above the pivots
for the upper jaws for maintaining the arms of
the upper jaws against said stops, adjustable stops
for the arms of the lower jaws, and yieldable
means below the pivots for the lower jaws for
maintaining the arms of the lower jaws against
their stops.
GEORGE F. YAGER.
15
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