US1411505A - Dental impression cup - Google Patents

Description

J. K. NORTHWOOD. DENTAL IMPRESSION CUP.

APPLICATIQN FILED JAN. 24, 192!- 7 1,41 1,505. Patented Ap 4, 1922.

2 SHEETS-SHEET 1.

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,4 TTORNEYS J. K. NORTHWOOD. DENTAL IMPRESSION CUP. APPLlCATION men JAN. 24. 1921.

Patented Apr. 4, 1922.

2 SHEETSSHEET 2- INVENTO/i J55. ff. A o/r' Tan 00o,

WITNESSES ATTORNEXS UNITED s r s PATENT OFFI'CE.

DENTAL IMPRESSION CUP.

Application filed January 24, 1921.

To all whom it may concern:

Be it known that I, Josnrn K. Non'rnwool), a subject of the King of Great Britain, and have declared my intentions of becoming a citizen of the United States, and am a resident of Washington, in the District of Columbia, have invented certain new and useful Improvements in Dental Impression Cups, of which the following is a specification.

My invention relates to dental impression cups,and a purpose of my invention'is the provision of a cup which can be contracted to cause the impression material to be firmly compressed. against the sides of a jaw, thereby insuring a perfect impression of the jaw.

It is also a purpose of my invention to provide an impression cup in which the contracting feature is accomplished by jaws which are supported for pivotal movement at such points as to eflect a uniform contraction'thereof toward the front and medial portion of the cup so as to produce uniform compression of the impression material throughout the length of a jaw. Furthermore, the companion jaws are capable of being locked in contracted position and are rcmovably associated with the body of the cup to permit of the substitution of jaws of any desired contour to suit human jaws of different contours.

I will describe three forms of impression cups embodying my invention and will then point out the novel features thereof in claims.

In the accompanying drawings:

Figure 1 is a view showing in perspective and partly disassembled, one form of impression cup embodying my invention.

Figure 2 is a perspective view showing in bottom plan. the body of the cup with the companion jaws removed.

Figure 3 is a top plan view, somewhat d iagrammatic, showing the companion jaws and locking means therefor.

Figure 4 is an enlarged detail perspective view of one of the companion jaws shown in Figures 1 and 2.

1 Figure 5 is a top plan view of'another form of impression cup embodying my invention.

Figure 6 is a bottom plan View of the cup shown in Figure 5.

Figure 7 is an enlarged detail perspective view of the body of the cup shown in Figures 5 and 6..

Specification of Letters Patent.

Patented Apr. 4, 1922.

Serial No. 439,599.

Figure 8 is a view similar to Figure 7 showing one of the jaws and brackets comprised in the cup shown in Figures 5 and 6.

Figure 9 is a top plan View ofa third form of impression cup embodying my invention.

Figure 10 is a detail perspective view of one of the sections of the cup shown in Figure 9. I

Similar reference characters refer to similar parts in each of the seve 'al views.

Referring specifically to the drawings and particularly to Figures 1 and 2, B designates generally the body of the impressioh cup which is formed of any suitable metal and. which includes a convex central portion 15 and a U-shaped lip portion 16 formed integral with and extending from the curved edge of the central portion 15. Secured to the lip 16 at points adjacent its opposite ends is a U-shaped supporting frame 17 provided at its intermediate portion with a forwardly extending handle 18 that is designed for the purpose of supporting the cup as a unit in proper position within the mouth. The frame 17 is secured to the lip 16 by means of tubular rivets 19 and in such manner that the two lips are supported in spaced parallel relation to each other as clearly shown in Figure 2. 0

F and F designate companion jaws, and each of these jaws comprises a base 20 of substantially the same general curvature as the lip 16 and the frame 17. Upstanding from the outer edge of the baseQO is a flange 21, such flange being co-extensive in length with the base and of a height which may vary from one end of the fiange'to the other depending upon the particular contour of the jaw to which the cup is to be applied. The base 20 has a bayonet slot 20 at a point adjacent its rear end, such slot being adapted to receive the corresponding rivet 19 in such manner as to pivot-ally support the jaw as a unit for inward and outward swinging movement with relation to the cup body when effecting a contraction or expansion of the Soldered orotherwise secured to the jaws F and F adjacent their forward ends are substantially L-shaped brackets 22,

i as

direction through the opening. The opposite end of the member is adapted to receive a winged nut 24 which when rotated so as to feed inwardly upon the member is adapted to move the brackets 22 together and to thereby effect a contraction of the jaws 'F" and F.

In the applied position of the jaws F and F to the body B of the cup, the base portions 20 are disposed between the lip 16 and the frame 17; the rivets 19 being (.lisposed at the rear ends of the bayonet slots 20". In this. osition of the jaws, their forward ends over ap as clearly shown in Figure 1, with the brackets 22 arranged substantially in parallel relation to each, other, so that by rotating the nuts 24, an inward movement of'the brackets 22 is effected to cause the in wardswingingof the jaws F andF about the rivets l9 asa center.

In. practice, the impression cup-1 having been supplied, with impression material, is inserted into the. mouth. of the patient and tossed into lace in theusual manner. The jitws F and?" which are in extended position are now contracted by rotation of the nut 24 so as to firmly compress. the inipres Sion material against the sides of the jaw, Itis to be particularly noted that because of the pivotal mounting of the jaws F and F the contracting or drawing together thereof is toward the frontor media-l, line of the cup, thereby exerting a uniform pressure upon the impression materialso as to obtain a perfect impression of the sides of the jaw. By virture of the fact that the fastening member 23 and the nut 24, prevent expansion or outwardmovement of the brackets 22, it will be clear that the jaws F and F are locked in contracted position so that the impression material is firmly held against the sides of the jawuntil it becomes set and the cup withdrawn.

As previous] described, the jaws F and F are remova ly associated with, the cup body, itbeing understood that the removal of the jaws can be readily effected by so manipulating them as to remove the rivets 19 from the slots 20. This .removability permits of the substitution of other jaws having flanges 21 of di'll'erent contoiu's, so as to render it possible to accurately fit the con tour of any patients jaw and thus-secure a perfect impression.

eferrin now to Figures 5, 6 and T, I have here s own another form of impression cup embodying my invention which is used in the same manner as the first form ofmy invention, and is of substantially the same construction. In the present embodiment, however, the lip, 16 ofthe body B- of the cup is fonned integral with the handle. 18, and the ends of "the lip 16 are formed with slots-25 adapted to receive securing members 26 fixed to the jawsF and F for removably jaws pivotally supported sustaining the jaws on the body. Brackets 27 and 27 are soldered or otherwlse secured to the aws F and F respectively, and each bracket is provided with a flange 28 or 28 which is spaced from the base of the jaw so" that in applied position of the jaw to the body, the flange serves to slidably retain the forward end of the jaw on the body. The bracket 27 also includes an extension 29 which is associatedwith the'curved end of the jaw F so as to telescopically receive be tween the two the confronting end of the jaw F ,it being'noted thatthe. upper edge of the flange is extended to span the space between the flange and the jaw. This arrangement of the flange obviously maintains the curved ends of the jaws F? and F in operative relation during thecontraction ofthe aws.

The brackets-27 and 2.7 aieiomned with openings which loosely receive a threaded fastening member, 30 that: eo-acts with a winged nut 31 to lock thejaws F and F in contracted positionin the same. manner as thBmBIHbBIS 23 and. 24 of the first form of impression cup.

Referring now to Figures 9 and 10, I have here shown a third form of impression cup which consists of two sections S and S pivotally connected to each. other by means of a pin 32. Each section S or S includes a body portion 33, the confronting edge of which is arranged in overlapped relation with respect to the adjacent edge of the other section. The

pin 32 extends through the body portions adjacent the rear end of the confrontin edges in the mannershown. Each section i or S also includes a jaw F or E formed integral with the body portion 33 or 33.

The curved end of the jaw F is. formed with a flange 34: which coacts with the jam to telescopically receive the confronting and of the jaw F and-thusmaintain the ends of the jaws inoperative relation to each other during i expansion and contraction thereof.

he cup shown in Figures 9 and 10 is used substantially in the, same manner as the other cups, it, however, being necessary in the present instance to grip the jaws themselves in eifecting a contraction of the same when forcing the impression material around the sides of the jaws.

Although I have herein shown and. de

scribed only three forms of impression cup embodying my invention, it is to be understood that various changes and modifications may be made herein without departing from the spirit of the invention and the spirit and scope of the appended claims.

What I claim is:

1. An'impression cup comprising, a. body, on thebody in a. manner to permit of their being contracted toward the front; and medial portion of the body, and means adapted to be arranged exteriorly of the mouth for moving and maintaining the jaws in contracted position.

2. An impression cup comprising, a body, jaws pivotally supported on the body and removably associated therewith, said jaws being capable of occupying expanded and contracted positions, and means for moving the jaws to and maintaining the same in con tracted position, said means comprising brackets secured to the jaws, a member extending loosely through the brackets, and a nut engageable with the member.

3. An impression cup comprising, a body including a U-shaped lip, a U-shaped frame secured and arranged in spaced relation to said lip, ahandle carried by the frame, a pair of jaws pivotally supported between the frame and lip to occupy expanded and contracted positions, and means carried by the jaws for moving and maintaining the jaws in contracted position.

l. An impression cup comprising, a body including a lip of U-form, a frame of U-form arranged in spaced parallel relation to the lip, rivets extending through said lip and frame at points adjacent their opposite ends, jaws having bayonet slots formed therein to receive said rivets in a manner to cause the rivets to pivotally support the jaws between said frame and lip, means carried by the jaws for drawing the same together, and a handle formed on said frame.

5. An impression cup comprising, a body including a U-shaped lip, a U-shapedframe arranged in spaced parallel relation to the lip, rivets extending through the frame and lip at points adjacent their opposite ends, jaws pivotally supported by said rivets for inward and outward swinging movement between said frame and lip, each of said jaws comprising a curved base portion having a bayonet slot formed therein, and a flange upstanding from the base portion and co extensive in length therewith, brackets carried by the forward ends of the flanges, and means engageable with the brackets for drawing the forward ends of the jaws together.

-6. An impression cup comprising, a body including a lip having slots formed therein, a pair of jaws, pins carried by the jaws and insertable in said slots for pivotally supporting the jaws upon the body, means for tele scopioally associating the curved ends of the jaws, and means for moving and maintaining the jaws in contracted position.

7. An impression cup comprising, a body, j aws removably and pivotally supported upon the body, brackets secured to the aws and including retention flanges, slidably embracing the body, an extension formed on one of the brackets and spaced from the corresponding jaw to slidably receive between the two the confronting end of the other j aw, and means extending through the brackets for moving and maintaining the jaws in contracted position.

JOSEPH K. NORTHVVOOD.

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