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Патент USA US2119579

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June 7, 1938.
H, c, HAGMAN E1- AL I
2,119,579
DENTAL ART I CULATOR
Filed NOV. 21, 1934
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Han/x] C. Hagfman and
Alexander S. 'T. Lagdard
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2,119,579]
Patented June 7, 1938
UNITED STATES PATENT OFFIQE
2,119,579
DENTAL ARTIGULATOR
Harry 0. Hagman and Alexander S. '1‘. Lagaard,
Minneapolis, Minn.
Application November 21, 1934, Serial No. 7754,0410
18 Claims. (CI. 32-32)
Our invention relates to dental articulators
adapted to support casts or models of human
teeth, models of human jaws bearing wax bites,
wax trial plates, and sets of arti?cial teeth for
5 the purpose of construction, study and experi
ment and has for its object to provide an ex
tremely simple and practical device wherein the
In the drawing:
7
Fig. 1 is a perspective View of an articulator _
illustrating an embodiment of our invention.
'5
Fig. 2 is an elevational side View of the struc
ture shown in Fig. 1 with a portion of the same
occluding and masticating movements of the
illustrated in section.
natural teeth can be reproduced with models or
Fig. 3 is an elevational sectional view taken
on line 3——3 of Fig. 2.
10
It has been found that the normal surfaces
of occlusion of the human teeth coincide with
the surface of a sphere approximately six to
eight inches in diameter which has its center
at a point situated above the roof of the mouth 15
and is intercepted by the longitudinal axes of
10 teeth supported in the articulator, so that when
construction of a restoration is completed it will
function properly in the mouth.
.
Another object of the invention resides in
H providing a dental articulator which is an im
1" provement over the articulator disclosed in Pat
ent No. 1,763,006 issued to Harry C. Hagman
November 19, 1929.
A still further object of the invention resides
in providing clamping means for locking the
~9 swinging modelv support in any adjusted posi
tion.
,
Another object of the invention resides in pro
viding a key for restraining rotational move
ment of the swinging model support.
An object of the invention resides in construct
ing the swinging model support with a stem and
in providing means carried by said stem for re
turning the swinging model support to normal
position.
30
and in the details of construction hereinafter
illustrated and/or described.
A feature of the invention resides in construct
ing the frame of the articulator with a socket
and in providing a sliding member on the stem
of the swinging model support having a conical
cam for engagement with said socket and in
further providing a spring encircling said sliding
member and urging said conical cam into en
gagement with said socket.
.
Another object of the invention resides in
providing a threaded member extending through
40 the mounting plate and adapted to be engaged
by a nut having at its outer end a projecting
portion adapted to become imbedded in the
jaw model to hold the same in position upon the
mounting plate and to further provide a pro
jection on the mounting plate engaging the
model for restraining the model from rotation.
A still further object of the invention resides
in constructing the swinging arm with a lug and
50 in providing a screw threaded into the upright
of the frame-for engagement with said lug to
swing said arm and limit the downward move
ment thereof.
Other objects of the invention reside in the
55 novel combination and arrangement of parts
-
the teeth. The relative movements of the lower
jaw with respect to the upper jaw will be closely
reproduced if the upper. jaw be assumed to be
universally pivoted at the center of said sphere
and articulated by swinging it about this center.
Our invention embodies the principles of this
theory.
Having reference to the drawing and particu
larly to Fig. 1 it will be noted that the inven
tion proper comprises a frame A in which may
be mounted the lower cast or model. This frame
has a base 16 from which issues an upright 10
disposed at the rearward portion of the same.
To this upright is pivoted by means of a hinge 30
I I a swinging arm l2 which is formed with an
overhanging portion l3. A hanger B is sus
pended from the overhanging portion 13 of arm
I2 by means of a ball and socket joint I4 and
may carry a mounting plate l5 or other suitable 3°
support for the upper jaw model.
For the purpose of illustrating the applica
tion of the invention, two complement-a1 jaw
-models 11 and 18 have been illustrated which
are applied to the mounting plate I5 and the as
base 16 respectively. These jaw modelsrhave
restorations 8| and 82 applied to the same which
in the particular case illustrated happen to be
full dentures. By swinging the arm back and 45
forth upon the hinge H, as shown in Fig. 1,
ready access to the models mounted on the basev
it and the mounting plate l5 may be had. When
the models are disposed on said plates, swing
ing of the hanger B together with the swinging 50
of the arm,l2 on hinge II, as will hereinafter be
more fully described, will cause the models to
move relative to one another in a manner very
closely simulating the movements of the teeth
when applied to the jaws of the patient. A 55
2,119,579
detail description of the construction and oper- '
ation ofthe invention is as follows.
The frame A of the invention. as previously
stated, consists of a base l6‘ which is in the form
of a plate and which is adapted to directly rest
slightly tapered so that as the same is screwed
into the slot 42, wear occurring through the use
of the device may be taken up. ‘A lock nut .43
and a lock washer 44 applied'tothe ‘end of the
shank 38 of said key‘ hold the same in adjusted 01
By means of this construction the
upon-the surface on which the articulator is _ position.
placed.
The upright Hi of the frame A issues
hanger B may swing in anyvertical plane and at
the same time rotation of the saidhanger is .pre
of the same and terminates in two hinge leaves vented. The ‘movement procured by this con
. struction simulates very closely the'movement of
10' i7 and’ .58 which form part of the hinge ||;
The lower'end of arm I2 is provided with a the human mandible so that teeth constructed
hinge leaf' 23 which ?ts between the two hinge with our improved articulator function in the
leaves 51 and I8. A pintle 24 passes through the proper manner when disposed in the patient’s
upwardly from the base I6 at the rearward end
various hinge leaves’ I1, 23 and I8 and serves to
mouth.
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pivotally support the arm |2 with respect to the
upright | ii. The pintle 24 is held attached to the
hinge leaf 23 'by means of a pin key 21 which
passes directly through the same vand may be riv
' In the construction of dental restorations and
' pose is constructed with a longitudinal rib I 9 and
includes a shoe 46 which snugly slides within the
bore 28 of head 22; This shoe is constructed with
a conical surface 41 which is adapted to engage
in the study of mouth conditions from models"
mounted on the articulator it frequently becomes
desirable to hold the jaw models in‘ certain rela-v
tive positions. For this purpose a clamping de~~
eted in place, if desired. The base l6 serves as
.a mounting plate or support for the lower model vice indicated in its entirety by the reference 20'
to be ‘mounted in the articulator .and for this pur- - numeral 45 is employed. This clamping device
V with transverse ribs2| which intersect the rib
'| 9 and whichproject outwardly from the surface
25 of the said base. When models are mounted
upon the base 16 and cemented thereto through
plaster of Paris investment or some other similar
substance, the models remain attached to the
base until manually disengaged therefrom.
so
At the upper end of the arm I2 is provided a
the upper portion of the ball 26; When this
shoe is forced downwardly, friction is exerted.
between the said shoe and the ball and further
friction is produced between the ball and the
seat 29. 'Such friction serves to hold the ball
from‘ movement and to retain the hanger B in
head 22 which forms part of the ball and socket ' any adjusted position desired. For producing the
joint M. This head is constructed wit-ha bore necessary pressure, a clamp screw 48' is employed:
23 open at the top which is reduced at its lower which is constructed with a knurled head 49 .and .
end to form an opening 3| which, is open at the a threaded shank 5i. Shank 5| is screwed into a.
bushing 52 which in turn is threaded and is ‘
35 bottom. This construction provides a seat or
shoulder 29 betweensaid opening and'bore which
'seat'e'ncircles the opening 3|.
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screwed into threads 53 formed in the upper end
of the bore 28 of head-22. The bushing 52 in r
addition to supporting. the screw 48, serves as an '
The hanger B includes a stem 25 which is se
cured to a spherical head or ball 26 forming part abutment for limiting the movement of'the shoe’
> 46 away from the ball 26. This is accomplished 40'
40 of the ball and socket joint l4.’ This ball is re
ceived within the bore '28 in the head 22' of frame '
A. Ball 26 is seated on the seat or shoulder 29
at the lower end of the bore and ?ts snugly with
in the bore 28, being held from lateral move
45 ment thereby. The stem 25 extends through the
opening 3| and is free to swing in any vertical
plane, being guided for such movement by said
ball and seat.
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The lower end of the stem 25 has attached to
gages the upper surface of the shoe 4,6:
A set
screw 55 threaded into the head 22 serves to
hold the bushing 52 in proper position.
.
For the purpose of supporting the jaw models
in open position, the following construction is 45:7 1
used. A screw El is employed which is provided
with'a threaded shank 59and a head 6 |. On the
upright I0 is formed a boss 58 which is threaded ' i
50. it the mounting plate l5, previously referred to,
to receive the shank 59 of said screw.’ The end
which is constructed with .a body portion 32.
of the screw is provided witha reduced tip 63
Issuing upwardly from the center thereof is a
boss 33.7 Boss 33 is drilled as indicated at 34 to
receive; the lower end of the stem 25. To hold
the mounting plate l5 attached to said stem a
set screw 35 is employed which is threaded into
the boss 33 and which enters a cavity 36 in the
stem .25. By means of this construction the
mounting plate [5 is detachably secured to. the
end of the stem. 25,,and may be removed and re
which is adapted to engage a lug 55 issuing out
wardly from the lowermost portionof leaf 23 of
arm l2. It will be noted that the shank 59.01‘
55
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by the lower end54 of this bushing which an: : '
60
50
screw 51 is eccentric with respect to the axis of
pintle I4 of hinge || so that when the screw is?5
turned in a clockwise direction lug 56 is rotated
and the arm i2 is swung about thehingeil to
raise the model support l5 and cause the models
to occupy a position similar to the openposition
placed whenever the occasion demands it. The of the humanvjaws. V The screw 5'! may be held
body portion 32 of mounting plate J5 is formed 7 in adjusted position through a lock nut 64 thread
7 with ribs 90 which serve to hold the~model 11
. in place thereon.
The hanger B is'held from rotation by means
of a key 31. This key has a threaded shank 38
which is screwed into‘ a' boss 39 formed on the
head 22. The end of the key 31 is constructed
with a pin 4| which is adapted to be snuglyrre
70 ceived within .a slot 42 formed in the ball 26.
The slot 42 is parallel with the axis of the stem
25 and the pin 4| is radially disposed with re
spect to the center of the ball 26 and is at right
65
angles to the axis of the stem 25 whenthe hanger
75 B is in normal position. Pin 4| may be; made
ed on the shank 5S and engaging the boss 58.
In the use of the articulator, the upper jaw' v
model support is. normally in a position such"
that the jaw models mounted thereon are in nor-.
mal occlusion. When the model support'is swung ‘
about the ball and socket joint l4 it is desirable:
that the same ‘return to normal position. For’
this purpose a device is employed'which is best
shown in Figs. 1, 2 and 3 and which is indicated '
in its entirety by the reference numeral 65. This
device includes a sliding member 86 which com- " ’ :
prises a ‘tubular portion 81 slidably 'mounted'on'
the upper part of stem 25 "of hanger B; This
3
2,119,579
tubular portion is free at its lower end and is
provided at its upper end with a conical cam
58. Cam 68 is adapted to engage a conical sock
et 69 formed on the underside of the head 22
and concentric with opening 3|. and bore 28.
When sliding member 66 is urged toward the
head 22, cam 68 moves the stem 25 into align
ment with respect to the axis of bore 28 thereby
returning the hanger B to normal position. The
sliding member 66 is urged toward the head 22
by means of a compression coil spring 10 which
is seated at one end against a shoulder ‘H formed
on the tubular portion 61. This spring is fur
ther seated at its other end against a collar 12
secured to the stem 25 immediately above the
boss 33 of mounting plate l5. Collar 12 is held
in position through a pin 13 which extends
through said stem and which is received in a
recess '14 in the lowermost portion of said collar.
The spring 10 is covered by a sleeve 15 which is
attached at one end to the tubular portion 6'! of
member 66 inproximity to the cam 28. This
sleeve at its other end slides upon the collar 12.
It will readily become apparent when the hanger
O B is swung from its position shown in full lines
in Fig. 2 to its position shown in dotted lines
that the cam 68 rides along the surface of the
socket 69 and that the sliding member 61 is slid
along the stem 25 in opposition to the action of
the spring ‘Ill. The relation of the parts when
the hanger is disposed at its extreme position is
illustrated in dotted lines in said ?gure. When
the hanger B is released, spring 10 causes the
sliding member 66 to assume its normal position
W Li which action moves the hanger back into nor
mal position.
To permit of replacing jaw models upon the
articulator after the same have been once re
moved, we utilize retaining devices which are
shown in detail in Fig. 2. One of these retaining
In the use of our invention the models are
mounted on the articulator in accordance with
the customary practice. Where a ?nder such as
disclosed in the patent above referred to is em
ployed, the lower jaw model is placed with the
teeth in occlusion with the spherical surface of
such ?nder. Plaster of Paris or some other suit
able investment is then placed between the jaw
model and the base l6 and allowed to set, which
causes the model to be ?rmly attached to the 10
base. The upper model is then placed in oc
clusion with the lower model and the same simi
larly attached to the plate 15. Where insufficient
teeth exist on the models, wax replicas may be
used to guide the technician in the proper mount
ing of the models. Where wax bites are avail
able the wax bites can be placed upon the teeth
15,
in the lower model and the upper model set into
the depression formed on the wax bite. The
models may then be attached in position as de 20
scribed. In the use of the articulator the pro
cedure is the same as with any other articulator.
In the study of the cases and in the construction
of restorations the hanger B may be manipulated
to cause the models to move in a manner simu 25
lating the movements of the human mandible so
that cases may be studied and restorations artic
ulated and caused to function in the proper
manner.
Our invention is highly advantageous in that
an extremely simple and practical device is pro
vided which reproduces movements of the human
mandible with great accuracy. The device is
small and can be constructed light so that the
same may be easily handled and manipulated. 35
The device for returning the hanger to normal
position is positive in action and extremely simple
in construction.
But a small amount of effort
is required to swing the hanger about its pivot
and when released returns immediately to normal
position. With our construction the hangers will
always return to identically the same position
so that inaccuracies frequently present in other
devices is used with the base l6 and the other
with the mounting plate I5. Inasmuch as both
of these retaining devices are identical in con
struction only the retaining device used in con
forms of articulators are entirely eliminated. By
junction with base IE will be described in detail. means of the retaining device models may be 45
This device comprises a screw 83 which has a ’ easily detached and replaced whenever desired.
threaded shank 85 and a conical head 84. The
Where it is desirable to study the jaws in posi
shank 85 extends through and projects up above tions other than normal occlusion, the clamping
the upper surf-ace of the base 16 while the head
device may be used which holds the hanger in
84 is countersunk in said base. Screwed upon the any desired position. Our articulator can be
shank 85 of said screw is a nut 86. This nut is
constructed with an hexagonal portion 81 at the
outer end of the same and with a circular por—
tion 88 adjacent the base l6. Circular portion
88 is smaller in diameter than the hexagonal
portion 87 so that projections are formed on the
constructed at a nominal cost and will not readily
get out of order. Adjustment of parts of the
invention may be made to take up wear thereby
insuring long life.
Changes in the speci?c form of our invention, 55
as herein disclosed, may be made within the
outer end of the nut which become imbedded in ~ scope. of what is claimed without departing from
undercuts in the jaw model 11 and which hold the spirit of our invention.
the model ?rmly attached to the base.
Having described our invention, what we claim
‘When it is desired to remove the jaw model
60
as new and desire to protect by Letters Patent is: 60
18 mounted on the base I6, the screw 83 is ?rst
removed. A sharp instrument is then inserted
between the jaw model and the base [6 and the
entire jaw model pried loose from its support.
1. In an articulator, a frame having an arm, a
head formed on said arm, a hanger pivoted to said
head for swinging movement away from a pre
Other models may then be attached to the sup
port and other cases handled on the articulator.
When it becomes desirable to reapply the model
the same is merely placed upon the base I6 with
the grooves formed in the bottom of the same
a cam on said member, means on said head for
engagement with said cam to cause said hanger to
registering with ribs l9 and 2} of the base.
Screw 83 is again screwed into the nut 8'! and
the model is as ?rmly attached to the support as
in the original instance. The same procedure
is utilized in the removing andreplacing of the
jaw model 17.
determined position, said hanger including a de
pending stem, 21. member slidable on said stem,
swing back to said position upon sliding move
ment of said member in one direction, and a
spring for urging said cam into engagement with 70
said means to procure movement of said member
in said direction.
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2. In an articulator, a frame having an arm,
a head formed on said arm, a hanger pivoted to
said head for swinging movement away from‘a
2,119,579
predetermined position, said ,hanger including, a
ldepending stem, a tubular member. encircling
' said stem and slidable relative thereto, a conical
cam on said tubular member, a conical socket
in said head adapted to be engaged by said cam
and a spring for urging said cam into engagement
with said
socket.‘
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3. In an articulator, airame having an arm,
a head formedon'saidarm, a hanger pivoted to
said head for swinging movement'away' from a
predetermined position, said hanger including a
depending stem, 21. memberrincluding ‘a tubular
'po'rtion encircling said stem, said member being
'slidable relative to said stem, a conical'cam on
the'end of said tubular portion nearest said head, '
' aconical socket in said head'adapted to been
gaged by said cam, a shoulder on said member
near said head, a collar on said stem spaced from
the, other,’ end of the tubular portion of'ysaid
and a. compression coil spring encircling
'20 member
the tubular portion of said member and stem and
means for holding the bushing‘ in, adjusted’ posi
tion relative to the bore, said bushing having a
threaded bore therein and a screw screwed into
the threaded bore of the'bushing and engaging
the'shoe for urging the ball‘against said seat, .
'7. In an articulator, a frame, a support thereon
.ior a lowerjaw‘model, an arm carried byzsaid
frame, a head formed on said arm, v:and over
reaching a jaw model mounted on the support, a
hanger pivoted to said head, said hanger includ 10
ing a depending stem and swingable laterally with
respect to said jaw model, a support for an ,upper
jawlmodel carried ‘by, said stem, a member car-.7
ried by said stem and slidable- relative thereto,
and means cooperating therewith for converting 15'
sliding movement of .said member into lateral
swinging movementiof said hanger.
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8. In an articulator, a frame, a support thereon
for a lower jaw model, an arm carried by said
frame, aihead formed on said arm, and over 20
reaching a’ jaw model mounted 'on the support, a
seated at oneendagainst said shoulder'and at I hanger pivoted to said head, said hanger include,’ '
its other end against said collar for ‘urging said ing, a depending stem and swingable laterally'
'
cam into‘said socket;
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a
i
with respect to said jaw model, a support for an ,
e
- A; In an articulator, a ,frame having an arm, '
25" a
head formed on said arm, a hanger pivoted to
upper jaw model :carried'by said stem, va coil
spring encircling saidstem, and means operated ‘
said, head for: swinging movement away-from a thereby for swinging the hanger transversely of ».
predetermined position, said hanger including a the lower jaw model. '
9. ,In an articulator, aframe, a support there- _
,f 7 depending stem, a member including a tubular
30 portion encirclingsaid stein, said member being 'on for a lower jaw‘model, an arm carried by said 7
slidable relativeto said ‘stem, a conical cam on
frame, a head formed on said arm, and over- '
the end of said'tubular portion nearest said head,
reaching a jaw model mounted onethe support,
a hanger pivoted to said head, said hanger in
cluding a depending stem and swingable later
ally with respect to said jaw model, a support 35
for an upper jaw model carried by said stem, a
a conical socket in said head adapted to be en
.Vgaged by said cam,'a shoulder on saidimember
35 near said head, a collar on said stem spaced from
the other end of the tubular portion ofsaid mem
ber,. a compression’ coilspring encircling the
tubular portion of said member and stem and
seated at one end against said shoulder and at
40 its other end against said collar for urging said
caminto said pocket, and a sleeve attached to
said member at one end and sliding on said
‘ collar at the other end, said sleeve encircling said ,
, spring and covering the same. '
45
i
5.'In 'an articulator, a frame having an arm,
a head formed on said arm, said head having a
bore therein terminating in an annular seat,ra
member carried by said stem and movablerelative
thereto, cam means betweensaid head and mem
ber, said cam means operating to procure lateral
swingingvmovement of the hanger upon 'move
ment of said member.
10. In an articulator, a frame, a'support there
on for a lower jaw model, an arm carried by said
frame, a head ‘formed on said arm, and over
reaching a'jaw model mounted on the support,
a hanger pivoted to said head, said hanger in
cluding a depending stem, a support for an upper
hanger including a ball, disposed within said’ jaw ‘model carried by said stem,_said hanger
' boreand seated upon said seat, a stem extending - being adapted to swing in a manner to cause the .
upper jaw model to move laterally in any'direce, 50»
60 from said ball, a shoe within said bore slidable V
toward'said ball, a bushing screwed into said tion away from its centric position relative to
head at the open end of the bore and engaging the lower jaw model, and centering means mov~
' said shoe for limiting the movement of said shoe
away from said ball and a screw threaded into
66 said bushing and engaging said’ shoe, said screw
urging the shoe into engagement with said ball
and the ball into engagement with said‘seat.
6. In an articulator, a frame'having a support
for a lower jaw model, an arm pivoted to said
ably carried by said stem and engaging said head
for moving the upper jaw, model from any of its
lateral positions back to centric position.
, '
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11. In an 'articulator, a frame, a support there
on for a lower jaw model, an arm carried‘ by said
frame; a head formed on said arm, and over!
reaching a jaw model mounted on the support,
a hanger pivoted'to said head, said hanger in .60
frame and overreachingamodel carried by said
support, said armiterminating at its‘outer end in cluding a depending stem, a support for an up, ,
per jaw model carried by said stem, said hangerr
a head, said head having a bore extending there
,through, the bore being vertical when the arm is ~ beingadapted to swing in a manner tocause the
in normal position, said head being provided at upper jaw model to movelaterally in any direc
65 the‘lower end of the bore with an annular seat tion away from'its centric position relative to.
?xed relative to the head, a hanger including a the lower jaw model, and centering means slid
ball disposed within said bore’, and seated upon able along saidistem and engaging said head for
'the seat, a stem depending from said ball, a 'moving the upper jawmodel from any of its late
support for’ an upper jaw model carried by said eral positions back to centric position.
. r
so
stem, a shoe within said bore-slidable toward ’
said ball, said bore being threaded at itsupper
end, a bushing threaded upon the exterior and
' screwed into the threadedrend'iof the bore, said
bushing engaging the end of the shoe and limiting
thezmrovement‘of, theball away from the seat,
12. In an articulator, a frame, ', a support 70
thereon for a lowerjaw model, an arm carried, by
said frame, a head formed on said arm, and over
reaching a jaw model mounted on the support, ,'
a hanger pivotedtosaidhead, said .hangerine
eluding a depending stem, a support for an’ upper
75
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2,119,579
jaw model carried by said stem, said hanger be
ing adapted to swing in a manner to cause the
upper jaw model to move laterally in any direc
tion away from its centric position relative to
the lower jaw model, a member slidable along
said stem and toward said head, said member
and head having juxtaposed parts, cam means
formed on said parts for cooperation to procure
movement of the upper jaw model from any of
10 its lateral positions back to centric position upon
movement of said member toward said head, and
a spring encircling said stem and urging said
member toward said head.
13. In an articulator, a frame having a sup
15 port for a lower jaw model, an arm pivoted to
said frame, said arm terminating at its outer
end in a head, said head having a bore extend
ing therethrough, said head being provided at
one end of the bore with an annular seat ?xed
relative to the head, upper jaw model supporting
means including a ball disposed within said bore
and seated upon the seat, a stem issuing from
said ball, a support for an upper jaw model car
ried by said stem, a shoe within said bore slidable
25 toward said ball, said bore being threaded at its
upper end, a bushing threaded upon the exterior
and screwed into the threaded end of the bore,
said bushing engaging the end of the shoe and
limiting the movement of the ball away from
the seat, means for holding the bushing in ad
on for a lower jaw model, an arm carried by said
frame, a head formed on said. arm, a stem pivot
ed to said head, a support for an upper jaw model 10
carried by said stem, said stem being adapted
to swing in a manner to cause the upper jaw
model to move laterally in any direction away
from its centric position relative to the lower
jaw model, and centering means slidable along 15
said stem and engaging said head for moving the
upper jaw model from any of its lateral positions
back to centric position.
1'7. In an articulator, a frame, a support
thereon for a lower jaw model, an arm carried 20
by said frame, a head formed on said arm, a
stem pivoted to said head, a support for an upper
jaw model carried by said stem, said stem being
adapted to swing in a manner to cause the upper
jaw model to move laterally in any direction ,
away from its centric position relative to the
lower jaw model, a member slidable along said
stem and toward said head, said member and
head having juxtaposed parts, cam means formed
having a threaded bore therein and a screw
on said parts for cooperation to procure move
ment of the upper jaw model from any of its
lateral positions back to centric position upon
screwed into the threaded bore of the bushing
and engaging the shoe for urging the ball against
movement of said member toward said head, and
a spring encircling said stem and urging said
justed position, relative to the bore, said bushing
35 said seat.
14. In an articulator, a frame, a support there
on for a lower jaw model, an arm carried by
said frame, a head formed on said arm, a stem
pivoted to said head and swingable laterally with
respect to said jaw model, a support for an upper
jaw model carried by said stem, a member carried
by said stem and movable relative thereto, and
cam means between said head and member, said
cam means operating to procure lateral swinging
45 movement of the stem upon movement of said
member.
15. In an articulator, a frame, a support
thereon for a lower jaw model, an arm carried
by said frame, a head formed on said arm, a stem
50
jaw model to move laterally in any direction
away from its centric position relative to the low
er jaw model, and centering means movably car
ried by said stem and engaging said head for
moving the upper jaw model from any of, its
lateral positions back to centric position.
16. In an articulator, a frame, a support there
pivoted to said head, a support for an upper jaw
model carried by said stem, said stem being
adapted to swing in a manner to cause the upper
member toward said head.
18. In an articulator, a frame, a support there
35
on for a lower jaw model, an arm carried by said
frame, a head formed on said arm, a stem, pivot
means at one end of said stem for pivotaly sup—
porting said stem relative to said head, said stem 40
being swingable laterally with respect to said
jaw model, a support for an upper jaw model
carried by the other end of said stem, a member
carried by said stem intermediate the ends there- r
of and disposed between said pivot means and
45
upper jaw model support and slidable relative
thereto, and means cooperating therewith for
converting sliding movement of said member into'
lateral swinging movement of said stem.
HARRY C. HAGMAN.
ALEXANDER S. T. LAGAARD.
50
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