US1160114A - Dental articulator. - Google Patents

Description

G. B. SNOW.

DENTAL ARTICULATOR.

APPLICATION FILED JUNE 29, 1915.

1 1 60, 1 1 4;. Patented Nov. 9, 1915.

179 16 9 0 3 1 L9 J6 J6 J9 l I a Z5 2.) g 7 E J r JJ COLUMBIA FLANOGRAPH 60.. WASHINGTON. D. c.

GEORGE B. SNOW, OF LONG BEACH, CALIF!)RNIA,v ASSIGNOR T SNOW DENTAL COMPANY, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

DENTAL ARmIcULATon;

' To all whom it may concern.

Be it known that I, Gnoner BURWELL SNOW, acitizen of the United States, and a resident of the city of Long Beach, in the county of Los Angeles and State of California, have invented certain new and useful Improvementsin' Dental Articulators, of which the following is a speclficatlon, reference being had to the accompanying drawing, in which Figure 1 represents a dental articulator to which myimprovements have been applied.' Fig. Qis an enlarged view, in section, showing'fthe internal construction of my spring cushion. Fig. 3 shows a modified form of my spring cushion, in which a fiat spring is substituted for the spiral spring shown in Fig. 2. Fig. 4 is a lateral View, showing the upper and lower model supports 1 of the articulator in part, with, the incisal stay rod and its platform, attached 'to the upper and lower model supports respectively, the platform being capable of rotation upon the lower model support. Fig. 5 is a lateral view of a'platform, made in two sections; one being attached to the model support, with the platform proper attached thereto and capable of lateral rotation upon it, as shown in Fig. 6. Fig. 6 is a front view of the platform shown in Fig. 5. Fig. 7 is a sectional view of the same platform. Figs. 8, 9and 10 show a modified form of the platform.

This invention is an improvement upon the dental articulator described and claimed in the 'United StatesPatent No. 870,909, issued November 12, 190

I have found that in'the use of this articulator, that unless it is carefully handled, the upper and lower modelsupports are apt to be sprung together, and the articulation of the dentures under construction thereby deranged. I have therefore added the Well known incisal stay rod, having improved upon the ordinary method of mounting it.

by making its platform adjustable in inclination, as will be hereinafter described.

I have also interposed spring cushions in the jOlIltS of the articulator for the purpose of imitating the directly lateral movement of the mandible in the direction of the inter-:

condyloid line, which it is well to take into account when constructing artificial dentures.

In the articulator shown in Fig. 1, the lower section is not directly connected to the Specification of Letters Patent.

' upper one,

lator shown in Patent of these links is varied at times upon the two sides of the articulator, as the move ments of the condyles vary in their inclination in different patients, and are not always v alike 0n the two sides of the same'head. (The above description applies to the articu- No. 870,909, as well as the one described herein). The upper section carries its model support 3, and the lower section its model support 4; both being made of round wire, bent to the required shapes.

To the upper model support is firmly attached the arm 5, having a vertical hole at its free extremity, through which passes the incisal stay rod 6, secured by the set screw 7. The lower end of the stay rod rests upon the inclined platform 8, which-is attached to the lower model support 4. Whenever the inclination of the links 9 is varied, the inclination of theplatform 8, which is attached to the lower model sup port 4, should be correspondingly varied;

but it usually forms an integral part of the model support; which is cast instead of be 'ing formed of round wire, and its inclination cannot, therefore, be changed. As I show it, it is a separate part, having a cross hole 12, through which the wire is passed which forms the model support before it is bent .into the required shape; the two parts being attached by means of soft solder. If

a very fusible alloy is used for this purpose, the union may be broken by a heat much below'thatof boiling water, and the parts will become re-united when they cool; and in this way, the platform-may be rotated vertically upon the model support and given any inclination desired. This platform is shown at 8, Fig. 4:. By using easy flowing solder for connecting the parts, I am enabled -to dispense with set screws or "gripping devices, which, in this place, would be cumbersome and objectionable.

Patented N (W. 9, 1915. Application filed June 29, 1915. Serial No. 37,034.

the curved cular movements of one section of the articu- 'lator upon the other.

- into two sections,

"the lower model support section in Fig. view of the same platform, and it'is shown in dotted lines as tilted laterallyupongthe pintle 13'.

bythe same easy flowing 11, and threaded for the which has not been shown'inany ing easy movement.

arcs, the centersfrom which they are struck being in the articulator joints on either side,

faces of the links 9 allowing 01rsiderable difference in the inclination of the .two links 9, 1 meet it by giving the platform a lateral inclination as shown in Figs. 6 and 8; thus making the V lncisal' stay pm more precipitous on one side shaped pathf of'the and. less so on the other. Forth-is purpose, I show at Fig. 5, a platform similar in general outline to 8, Figs. 1 and 1, but divided 10 and 11. Section 10 hole 12 which receives 4, and has upon its side a pintle 13, upon which is fastened the section 11. This. is shown in central vertical 7. Fig. .6, is anend or front contains the cross are. to be connected solder used for atthe model-support,

The parts taching the platform to andso by slightly warming them, they may desired in- 3 he loosened and adjusted to any clination, vertically or laterally.

Tn'Figs. 8, 9 and shown as extending through thczplatform holds the parts securely, and so,.the lateral adjustment may be elfected'without disturbing the'vefrtical .one.

--There is a direct lateral movement of the condyles' of the mandible in. the glenoid fossze in a way; which so far. asI am aware,

the purpose of imitofore constructed, For 7 V I use the spring tating this movement,

cushions which are constructed as follows.

(See Flg. The cheek piece 16, presents afflat surface to the link 9, allowing of an easy shding movement .of-one part upon the other, and the joint pin 17=is received'into theslot 18 in link 9.. A cup 19, isthreaded intowthe arm 15 of the lower section 2 of the articulator, and-into this is received the cup 20, formed upon the back of the cheek piece 16; the two parts fitting closely, but allow- A spiral spring-21 occupies the cavityformed by the telescoping of thetwo cups 19 and 20, which-forces the cheek piece 16inward against the link9. "A screw 22passes centrally through the spiral spring, 16, its head 23, shouldering against the outer This screw limits the and is threaded into'the cheek piece surface of the cup 20.

co ies of this atent may be' obtained for followed by the point of the 6 uponthe platform 8, will I the curved face of link When there is a con- 10, theupintle 13 isthumb .nut 1-1,

. model support, laterally upon the first section,fg substan- ..100, 3. Spring cushions interposed between the articulator here--,

' screw bolt, toregulate five cents each, by'aildressing-the Washington, D. 0.: if

action of the spiral spring 9, allowing easy movement of one upon'the' other, without 21,50 that the I cheek piece 16 isbarely out of contact with lateral shake. A steady pin 28 prevents the rotation of the cheek piece 16 and holds it level. By lateral pressure uponeither one I of thelinks 9, the opposing one of the two is pressed against,

lateral movecheek pieces 16, which will yield, allowing a direct y ment', the parts recovering their original po Sltl OIlSilS soon as pressure 1s released. QAndin this way Tam enabled to lmltate the 1 slight lateral movement which is executed by the mandible during mastication,- hereto fore mentioned.

In Fig. 3 is shown an alternativeconstruction of the spring cushion in which a;-flat.

spring is substituted/for the spiral'spring shown in Fig. 2. A. cup 26forms an integral' part of the arm 15, and; through it passesan extension of the cheek piece 16, threaded at its. end. A nut. 25' limits fthe movement of the flat spring, which is attached to thelowersection"2 by the screws 27. .The'operationof thedevice is precisely thesame as that of theone'shown in Fi.g. l-iaving thus described my 'mventlons, .I'

claimas follows. Y

1. In a dental articul tor, aplatform for an 'incisal stay rod. rotatable vertically upon the modelrsupporfl substantially as described.

. 2. In a dental articulator, a, platform for an incisal stay, rod, made ,in two-sections, one section rotatable vertically, upon the the other section rotatable tially as described. j I two sections of-a dental; artio'ulator and forming. parts of the joints thereof, said cushions affording a directlateral movement along the intercondyloid line, as set forth.

1. A spring joint of a dental articulator,.consisting of substantially cushion interposed in. the

a hollow cylindrical bearing surface at- I 1s. M.- Ron} R. E. JENNINGS.

substantially as de- Z enon'eit B, snow.

Commissioner of Patents.

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