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Патент USA US2404561

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July '23, 1946.
Filed March 20, ‘1945
Patented July 23, 1946
. '
" '7
Rudolph F. Bannow, Easton, vConn.
Application March 20, 1943, Serla'l’No. 479,836
10 Claims.
(01. 90—17)
tool upon some suitable projecting frame sup
enabling the machining unit't'o be swung bodily
about 'a hinge axis perpendicularly related to‘ the
longitudinal axis of the‘ overarm. Additional ad
vantages may arise if the hinge axis is arranged
port. The support may constitute the horizontal
actually to intersect the overarm axis.‘ '
This invention relates to adjustably jointed ‘
structures for mounting a portable self-powered
work machining unit with its cutting or abrading
Another object is to so mount the said‘ machin
ing unit that it can swivel relative to‘ the over
arm" in a plane parallel with the aforesaid hinge
this type usually incorporates a movable table
axis while such hinge axis remains fixed with re
equipped to hold the work ?rmly in different po
sitions while being machined by the cutting tool. 10 spect to the overarm. and, also while the axis
about which‘sai‘d'unit swivels aligns or is coinci
An articulated holding structure forthis gen
overarm that projects from the standard of a
floor type of milling machine. A machine tool of
eral purpose is disclosed in my United States Pat- ,
dent with the axis of the overarm.
A further object is to ?rmly establishpositions
ent No. 2,275,291 wherein the self-powered work
for'the machining unit asva whole at opposite
machining unit comprises a milling attachment
incorporating a rotary cutter. A similar use for 15 extremes of its 90 degree range of swinging move
ment about the said hinge axis relative to the
like holding structure, but wherein the self-pow
ered‘ work machining unit incorporates a length
A further object is to'eflect swiveling adjust
wise reciprocative cutter such as a ?le, slotter or
ment of the machining unit. as a. wholeby ~means
broach, is disclosed in an application copending
herewith, Serial No. 474,650, ?led February 4, 20 of gear toothed devices which shall at all. times
sei‘ve‘to’relieve the operator of the necessity for
manually supporting any .heavily' weighted,‘ olf
As proposed for use with each of the foregoing
center portions of the machining unit‘v while its
articulated holding structures the horizontal
bodily position is being readjusted. "
T . ’
overarm of the milling machine has been capable
of being adjustably turned upon its longitudinal 25 A further» object is to provide a novelly'con
structed hinge bracket so jointed that two rela
axis in relation to the machine frame or standard
tivelyrswingable sections thereof are so related
by which it is supported. In some cases however
that one‘of said ‘sections'ca‘n beifreed and turned
this overarm, or the equivalent projecting pri
adjustably about the longitudinal axis of the over
mary means of support for the self powered ma
chining unit, may not be capable of rotary ad 30 arm‘ as wen as freed to slide lengthwiseio'n the
latter, and the other of said sections can support
justment about its own axis‘relative to the ma
the machining .unit in a manner enabling. the
chine frame. Where this condition has been
_ latter to swivel adjustably with respectto it, present in former cases, it has undesirably re
A still further object is to' combine with more
duced the number of angular directions in which
the work cutting tool can be inclined while oper
ating on the work.
One object of the present improvements is to
provide an adjustably jointed supporting struc
ture which will compensate for inability of the
than ordinary compactness and within'a unitary
section of a jointed support ‘structure, ‘a kind of
removable trunnion that shall afford swivel sup
portfor a self-powered machining unit, together \
withtransrnission gearing that shall-‘be Operative
overarm to be adjusted rotatably or to measur 40 to effect and maintain changesfin the bodily po
able degrees about its own longitudinal axis so
sitioning of the machining‘unit." ,
that there ispreserved or restored to the cutting
The foregoing and other related objectives will
tool as many possible‘ angles of operating inclina
tion as is possible to a self-powered machining
unit supported upon a rotatable‘overarm.
A further object of the present improvements
is to permit the self-powered machining unit at
times to be bodily shifted lengthwise of the over
arm in cases where the latter is not itself longi
tudinally slidable with respect to the machine
frame from which it projects,
Another object of the'i'nvention is to support
aiself-powered machining unit on the vend of a
horizontal overarm that is fully cylindrical
throughout its ‘entire length, yet inv a manner
appear in greater particular from the following
45 description of a preferred embodiment of them
vention selected from numerous possible forms of
the present improvements for illustrative pur- ,
poses only, and in which description reference is
made to the accompanying drawing wherein:
Fig. 1 is a plan view of a complete machine tool
of the'floor standard type incorporating a slotting
attachment ‘supported thereon through the medi
um of - a" jointed angle bracket embodyin'glthe
present improvements.
Fig. 2 is a fragmentary viewof the same ma
attachment in full. >
powered machining unit will be found in the
aforesaid copending application Serial No.
474,650. Its operation enables a work piece held
3gvgisiarr~enlargsdplan view of the jointed
. ing H9. The foregoing and other details of the
possible construction and operation of a self
chine tool in side elevation showing the slotting
h part of its structure
‘02nd sc ose concealed parts, the
hinged together sections of the bracket being ob
liquely related as when adjusting between ex
treme limits of their relative movement.
Fig. 4 is a plan view of the bracket sections of
on table I2 to be out while the axis. of the tool
is ‘disposed in any desired location relative to
the work as well as while the tool axis is disposed
at any desired angle to the work. A millingv at
Fig. 3 established at one extreme of their’ range
of adjustive movement opposite to that position
shownin full lines in Fig. 1 and which'serves to
' tachment like that disclosed in my aforesaid
bring the self powered machining ,unit into its;
7 described as fully appears in therdisclosure of '
broken line position in Fig; 1.
patent maytake the place of or be used in con
junction with the slotting attachment above
the said .copending application.
Fig. 5 is' a view taken in section'onrthe plane 15' s-The portion of the work machining unit,
77 whether it be a slotting attachment or a milling
5-15 in Fig. 4 looking in the direction of thear
attachment, which is of most concern to the
vpresent. improvements consists of a circular
mounting ?ange. 98 presenting a ?at face later
20 ally 10f crank case 86 penetrated by tightening '
Fig. dis a View taken in section on‘ the plane
6—6 in Fig. 5 showing only the overarm embrac
ing sectioniof the'hingerbracketa
bolts 96 'of which there maybe four equally
H Fig; 17 isa fragmentary plan v.view taken .in sec
tionh-ondgthe planes 1.—.-'l_. in Fig. 5 looking in. the
spaced about a circle near the periphery of
direction of the arrows.
mounting boss 98 as shown in Fig. 7. The other-.
wise flat face of circular ?ange 98 may be cen
Conventionalipartspf a milling machine type '
of machine .tool are indicated in.v Figs... 1 and 2
trally recessed at Qitfor receiving and locating
comprising. the floor. base If), theframe standard
1.! vand 5a movablework holding table l2 which
,can. be. ‘shifted vertically by. the. usual, screw
?xedly thereon the end of ‘the ‘journal forming
ting recess 96. Thistrunnion has a thrust af
handle it; .aswell. as'v..backward and forward. by
fording head 88 of .enlargeddiameter and is de
shank of a stub-shaft or trunnion 85 snugly ?t
the usual screw handle LI 4, . and also side. to side 30
by the usual screw. handle IS. .The turret 22 is
securableon top of‘ frame. standard I I, inany po
sition to whichit may be turned. about a vertical
' axisby, tightening nuts. 28 on the ends of clamp
‘bolts 21 in. the nichesv 18. These, and other de
tails of the main machine may be ‘constructed
as fully :ldisclosed in. my .aforesaidUnitedStates
Patent ;'No. 2,275,291..
I» shall refer to gas yoke section 16. Bore 84 is
counterbored to accommodate the trunnion head
88. The foregoing construction‘ is shown most
clearly in Figs. 6,:jnclusive. 7
g .
The journaledi periphery of trunnion?BS has
r i. As. further: disclosed in as patentthe turret M .
head. 2271s .hollow andprovides rotary bearings
whichs-alsose'rve v‘as. slide bearings in‘which is
slidably journaledia sturdy elongated overarm
34. ‘ACCOI‘dlng. to the p-rcsentimprove-ments this
sunken gear teeth 9| cut into it .all the way’
around to form in effect a worm wheel. These
sunken gear ‘teeth 9| are in mesh‘with a worm V
92 ?xed on a cross, shaft 93.
overarm maybe cylindrical throughoutits en- I -
tire.;length.. .Theoverarm is rotatable through
360'angular degrees of turning in, its said bear
tachably held to crank case 86'byholding screws
81, The shank of trunnion 85 is journaled in a
central bore 84 in one swingable sectionof my
improved jointed hinge bracket, which section
ingsas‘ wellas slidablelengthwise therein. 1 The"
As best shown in
Fig. 7,v shaft 93 has one end journaled directly
in the structure of yoke 'l?rand has its other end
journaled in an externally threaded bushing 14
larger in diameter than‘worm 92'and removably
lodged in the structureof yoke 76. Shaft793
crown wall 35 of the turret containsa split dis
carries at each vof its endsloutside of the yoke . ‘
structure the squared terminals 94 to which may
posed lengthwise of the overarm which enables
its side halvesto be sprung toward each other 50 be applied a, removable handle or wrench (not
by. means-of draw'bolt handles 31 thereby to 7
clamp and hold the overarm immovable.’ How
shown herein) for turning the shaft 93_.and
hence worm 92., There may. be a scalerof angle
measuring graduations 83. on the periphery of
ever there may be mechanism on the, inside of
yoke section 16, and there may be an index or
the particular turret 22 here disclosed which
could be constructed and operated by hand wheel 55 zero mark with suitable Vernier or other in
dicia on the periphery of the mounting ?ange
55 as disclosedin my?aforesaid Patent 2,275,291
98 of the machining unit to. accord with such
for vrotating overarm 34 about its own longi
graduations for determining the angular extent
tudinal axis while‘ permitting the overarm to be
shifted ‘horizontally lengthwise ofthe turret to ' of swiveling movement of the machining unit
any desired extent when handles 31 are turned 60 relative to yokesection 16.
For?rmly holding these two parts together in
to loosen their draw, bolts.
The work machining unit or attachment
herein chosen as illustrative of any portable self -
every swiveled relationship to which they may
be- turned, there is sunken in the flat face of
mounting ?ange 16 an annular slot 95 of T
powered machining unit may be constructed like
that disclosed in copending application, Serial 65 shape cross-section which accommodates the
square heads of clamp bolts 96 whose threaded
No. 474.650. >It will Vsu?ice here. to explain that
this‘ machining unit'will ordinarily include a
ends project forward and out of the mounting
?ange 98 of crank case 86~and thereat take
‘main'body portion such as crank case 86 in
which there may be guided lengthwise the shank a 1 tightening nuts 91.
The collar section 15 of the improved jointed
1 I ill, of a tool" holder 12 carrying/a broach 6|
angle bracket occupies the space between the top
7 or other form of work cutting tool adapted to be
reciprocated lengthwise by the running of power
arm 79 and the bottom arm 80' of yoke section
motor 98 and preferably at, various speeds'de
l?and is of hollow block-like nature boredto
termined by a variable speed power transmis- ’
v?t and adjustably embrace the fully; cylindrical
sion such as stepped pulleys housed within cas
75 end of overarm 34.
A mean portion of collar
section ‘I5 is bored oversize at 13 to avoid. having
than is shown in ‘Fig. 2', this viéw'bei'ng vertically
to nicely finish a needless extent of bearing sur
face for contact with the periphery of the over
arm; The wall of member ‘I5 is split at ‘I2 and
provided with lugsv to receive two tightening
bolts 'II which pass through clearance holes in
the lug on one sideof split ‘I2 and which have
threaded engagement with the lug. on the other
side of the split. The lower lug in Fig. 5 also
contracted to save space in the drawing. In the
carries a slot spreading screw ‘ID in threaded en
gagement therewith whose top end may thrust
against the lug on the opposite side of the split
position of-parts shown in Figs. 1 and 2the tool
holder I 0 l'will reciprocate in a true vertical path
either‘ at the location of tool 6| shown in full
lines, or‘at‘the broken line location of such tool
which is attained by adjustively shifting yoke
so as to spread the split and cause member 15
to reduce the tightness of its hug on overarm 34.
Hinge bolts 8| pass with a clearance ?t respec
tively through elongated slot ‘II inthe top arm 19
of yoke section 16' and through a similar elone
gated slot ‘I8 in the bottom yoke arm 80 ‘and have
threaded engagement with hardened threaded
bushings 82 lodged immovably in section 15.
Thrust washers 89 separate the heads of hinge -
bolts 8| from raised faces of bosses bordering
around slots ‘II and ‘I8 on the outer surfaces of
yokie arms ‘I9 and 80.
Further features of construction of the jointed
angle support bracket consist in the following.
Fig. 1 shows that the smoothly ?nished?at-faced
crotch ofyoke section ‘I6 is seated ?rmly in sur
face contact with the smooth ?at-faced end 68
of collar section ‘I5. The exterior'of this collar
section, on the opposite side of overarm 34, from
section ‘I6 and its carried work machining unit
to broken line position in Fig. 1. This is done by
loosening the hinge bolts >8! so the yoke section
may be shifted radially outward and swung past
the corner'of the collar section ‘I5 as indicated
in Fig. 3. Either in the full line or the "broken .
line position in Fig. 1, crank case 86 bodily may '
be‘ swiveled about the axis of' trunnion 85 and
carry the axis of cutting tool 6| to any desired
angle‘ of inclination in relation to the work.
These two means of adjustment coupled ‘with the
ability of the collar section ‘I5» to itself swivel
about overarm 34, as well as to slide lengthwise
thereof when fastening bolts ‘II are ‘loosened,
gives to any'self-powered machining 'unit sup
ported by‘means of- my improved jointed hinge
bracket full ability to be located and inclined
in as many different ways and positions as, can
be located and disposed the self-powered ma
chining unit of the aforesaid patent and pend
ing application even if the ‘overarm 34 itself be
rotatively ?xed in turret 22. It is of course un
30 derstood that after any adjustive shifting of the
‘position of the machining unit, all holding bolts
lugs 69 and split 12, is provided with three spaced
seating pads orbosses 65, 66 ‘and 61 in triangu
lar relationship whose flat faces‘are coplanar‘
and afford three-point ‘seating abutment for the
will be thoroughly retightened to prevent acci
dental disturbance of the thus established posi
?at crotch face of yoke section ‘I6 when the latter
means of worm 93 and worm gear‘ 9| will at all
tion of the machining unit... The turning of
crank case 86 relative to the yoke section ‘I6 by
time's'relieve the operator from having force
fully ‘to lift or support‘ any heavy part of the
section end 68 at one time, and the coplanar
machining unit that hangs off‘ balance even
bosses 65, 66, 61 at another time, ?rmly and de?
nitely establish the self-powered machining unit 40 though retaining nuts 91 are loosened. In the
.at the opposite limits of its exactly ninety degree
appended claims'the face of ?ange 98 is some
range of swinging movement about the‘common
times referred to as'a mounting face while'the ~
?ange-like head of yoke section ‘I6 is referred to
axis of hinge bolts 8|. This axis preferably in
is positioned as in Figs. 4 and 5. The'?at face of
tersects the longitudinal axis of overarm 34 and
as a head wall presenting a swivel seat for mat
is perpendicular thereto. On the top and bottom 45 ing contact with such mounting face of ?ange
exterior of collar section ‘I5 there are provided
While as herein shown, the projected axis of
annular thrust surfaces 64 raised in relief and
trunnion 85 is coincident with the axis of over
?nished ?at and smooth to swivel in contact with
arm 34 in Fig. 2, these axes could to advantage
the flat smooth inside surfaces of yoke arms ‘I9
and 80; respectively.
exterior of collar section ‘I5 which’ bulges outward
for some purposes be so related that one is in ec
centric relation to the other, in which case the -
Figs. 3 and 5 show that the ?at crotch surface
which faces seating ‘pads 65, 66 and 61 is concave
ly hollowed out at 63 to clear thegrounded convex
somewhat between lower seating pad 61 and up
per seating pads ‘35, ‘66. Fig. 3 shows that the
crank case 86 in Fig. 2 would be adjusted about
a different center when frame 98 is swiveled in
relation to'yoke section ‘I6 than when collar sec-l
tion‘15'is rotated about overarm‘ 34. A greater
variety of possible ‘positions for the self-powered
elongated slot‘ 11 permits pulling‘ the yoke sec
tion away from concentric relation to the col
machining unit results. Many other modi?ca
be the case if yoke section ‘I6 were limited to
reasonable interpretation of the claims.
tions of the precise shapes, sizes and relation
ships of v the structures here disclosed will be
lar section far enough to permit hollow 63 to clear
the outer corner of the collar sectionwhile swing 60 recognized as possible of incorporating the use
ful principles of this invention. Hence the patent
ing the yoke section past it aboutthe hinge bolts
8|. Greater compactness of the jointed hinge
tube granted will be understood as vconteinp'laté
ing and intending to cover all variations of and
bracket as a whole is thus made possible and less ‘
size and weight of material is required in its con
substitutes for the particular embodiment herein
struction without sacri?cing strength, than would 65 disclosed which come fairly within the broadest
swinging about a ?xed hinge axis.
The manner of operating the improved jointed
attachment structure in a manner to incline the
longitudinal axis, or the stroking direction, of the
cutting tool 6| into any angular relationship to
' the work will for the most partbe obvious ‘from
the foregoing description. ‘Ordinarily the work
table I2 will ‘be set in lower position‘ relative to
the'cutting tool BI by means of handles l3, I1 75
l. The ‘combination with a machine attach
ment having a laterally disposed mounting face
by means of which said attachment may be sup
.ported in'adjustable positions'of, a supporting
bracket including a head wall presenting a swivel.
seat for mating contact with said mounting face
andcontaining a .bearing hole, a central‘reces‘s
in said swivelv seat, a trunnion received‘in and
2,404,561 a
straddled by said'hinge arms; and __connecti_ons
between said hinge arrnsand ‘said- collar section
form-ingja hinge pivot whose axis coincides at
least at onepoint with said longitudinal axis :of
' . snugly ?tting said'recess and journaledl in‘ said‘
bearing hole and ‘having worm wheel teeth ‘radial-1
ly‘withingthe compass of the journaled surface of
1 said; trunnion, holding bolts penetrating said;
trunnion having threaded engagement with said
machine attachment, said trunnion being shaped
to prevent‘separation of said'mounting face from
said swivel seat, a worm in'mesh with said teeth
rotatably carried by. said supporting bracket; and
'me'ans'rel'easably to lock. said machine attach
45.’ Ina machine tool of the type includinga
frame standard higher than its'associated work
holding; table, the combination with said stand
ardj-of, a work machining unit includinguan elon
gated to'ol shank power driven withrvrespect?to
its longitudinal axis while said axis is variously
ment against swiveling movement about said.
trunnion'relative to said supportingbracket.
2." The combinationwith a machine attach
ment having a laterally disposed mounting face
by means of which said attachment may be sup 15.
stationed and'inclined in relation to w'ork’secured .
on said table in" ?xed relationwto said standard,
an overarm supported by‘said‘frame standard,
and an articulated structure forsupporting said ‘
and containing a bearing holeya central'reccss
machining unit at variousstations for operating
on said workvincludinghatleast three supportfsec-l
,tions, the first of'saidsections comprising‘ said
overarm, the second of-said sections comprising a
in isaid'mountingjface, a trunnion received in and
collar turnably sleeved on said overarm, and the
ported'in adjustable positions of, air-supporting
bracket includingaheadwall presenting a swivel
seatfor matingcontactwith said mounting face
third: of said sections comprising a yoke strad- '
snugly ?tting said recessjournaled in said ybear~
dling and pivotally connected to said collar and
ing holeand having worm wheel teeth radially
within the compassof ‘the journaled surface of
coupled adjustably'to said machining unit.
6. In a machine tool as described in claim 5, the
‘ 7 said. trunnion, holding boltsjpenetrating said.
combination defined in said claim, together with
worm'. and. gear connections between thesaid yoke
trunnion having threaded engagement with said 25
machine attachment, a shoulder on saidtrunnion
preventing separation of said mountingface from .
said swivelseat, a worm inmesh with said teeth
Vrotatably oarriedby said supporting bracket, an'
annular. anchorage groove sunk in said swivel
and. the said machiningunit.
_ "77, An 'adjustably jointed support structure for
mounting a portable self-powered workma'chin
ing uniton anon-rotatable overarm, comprising a '
collar block bored to turnably sleeve on the over
seat, tightening’ bQlts penetrating, said mount
ingfacehaving .flatted- heads occupying and; Dre
arm,‘ and a bracket including a head wall for sup;
porting said machininglunit invariable relation
3 ~ vented from turningby said anchorage‘groove,
and manually ‘accessible nuts onsaid bolts at the
exterior of said machineattachment
3. .The combination. with a cylindrical machine
overarm and a machine ' attachment having a
.to saidv block and spacediarms rigid with said
35 head wall straddling‘ and pivoted to said collar ‘
~ block tdswing relative to the latter ab‘out‘an
‘ 'axis‘croisswise of theaxi's of said bore.
r *8; ‘The combination with a work machining at
laterally disposed mounting ’ face by means. of
tachment having a mounting face by means of
which‘ said attachment may be supported in ro
which‘ said’ attachment may be supported in ad-‘
justable positions on said overarm ‘of, a support?
tatalolyjv adjustable positions. of, a supporting
' ing bracket including ahead wall presenting a‘
bracket'rincluding a‘head' wall presenting a swivel
seat in’ mating relation to' said mounting face
swivel seat for mating contact with said mount
ing facerand having-two spacedhinge arms forks
and containing a bearinghole, a trunnion in ?xed
ingfrom said wall. ina direction ‘away from saidv
surface, said wall containing a bearing bore openev .45 relation to ‘said mounting face journaled in'rsaid
bearing hole, meansto prevent separation of said
ing into the space between said hinge arms‘,v a
mounting face ‘from said swivel seat; and‘ gear
trunnion ini?xed relation to said mounting face
connections‘ between said brackets and said trun
journaledin said bearing bore-means to prevent
nion constructed‘ and arranged to cause and con
separation of said headfwall from saidswivel
seat; means releasably to lock said machine at 50. trol selective degrees of swiveling movement of
said mounting face with said trunnion‘ relative to
tachment against swiveling movement'with said
said swivel seat including gear teeth carried'by
trunnionyrelative to said supporting bracket, a
said trunnion and a gear rota'tably carried'by said
collar section turnably sleevedon said overarm
comprising‘ a hollow blocks-like body straddled‘
'arins,"'and ‘pivotal connection ‘be; 55. '9;- ‘The; combination ‘ with’ a work ' machining.
attachment having a mounting'face by means of
tween said hinge arms and said collar section.v
which" said attachment may be supported in ro-
by’ a1
4.‘ The ‘combination with a cylindrical machine
overa'rm having a longitudinal'axis of, .a‘machine'
attachment having a laterally disposedrmounting 7
face by means, of which said attachment may
be'supported in adjustable positions on said over-j
arm; a'supporting bracket including a head wall
presenting’ :a swivel seat for mating contact with
said mounting face and having two spaced hinge"
tatablyn adjustable ' positions of, a supporting
bracket ‘including 'a head wall presenting a swivel
seat in lmat-ing' relation to said mounting face‘and
containing a bearing-hole; a'trunnion in'?xed
relation'to saidrmountin'g face journaled in‘rsaicl
‘ bearing» hole; means to prevent separationrof said.
'mounting‘face" fromrsaid swivel seat, and‘ gear
arms forking from said wall in a direction away 65 connections between said bracket and said trun
from said surfacasaid wall containing a bear ‘ ‘ nion constructed and arrangedtorcause and con
ing bore opening into the ‘space 'between said .. trol'select'iv'e degrees ‘of swiveling vmovement of
hinge arms, a trunnion in ?xed vrelation to‘ said ‘ said mounting face with said'trunnion relative to
mounting face ‘journaled in' said ‘bearing 'bore,‘
said swivel seat including’ gear teeth. formed in
means to preventseparation of said head ‘wall .70 the surface'ofjsaid trunnion and a gear in mesh
from said swivel seat‘, meansreleasably to lock
with,‘ said teeth: rotatably carried by said sup
said'machine attachment against swiveling'move
ment with saidltrunnion relative to said support
porting‘ bracket.’
, 10. The combination with a work‘xmachining
ing‘brackenja collar section. turnablysleeved on
attachment having‘a mounting faceby means
saidToverarm ‘comprising. a ' hollow block-like body 7.5
of whichu'saidattachment may be supportedin
rotatably adjustable positions of, a supporting
trol selective degrees of swiveling movement or ‘
bracket including a head wall presenting a swivel
seat in mating relation to said. mounting face and
containing a bearing hole, a, trunnion in ?xed
relation to said mounting face journaled in said
bearing hole, means to prevent separation of said
mounting face from said swivel seat, and gear
connections betweenisaid bracket and said trun
said mounting face with said trunnion relative
nion constructed and arranged to cause and con
to said swivel seat including worm wheel teeth
formed in the surface of said trunnion radially ‘
within the compass of the journaled surface of
the latter, and a Worm in mesh with said teeth
rotatably carried by said supporting bracket._ '
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