US 2400912 A
Description (OCR text may contain errors)
May 28, 1946.
v. E. BRITT Eil-AAL DENTAL APPLIANCE Filed Dec. 29, 1944 2 Sheets-Sheet 1 INVENTORS VERNON EARL 8,@/7'714/1/0` .man
May 2s, 1946. v; i; Bmw ET AL DENTAL APPLIANCE 2 Sheets-Sheet 2 Filed Dec. 29, 1944 INVNToRs- VERNON EARL BQ/T'A/v Een/5T Ausf/5r 605725 vo. n
Patented May 28, 1946 UNITED STATES PATENT OFFICE DENTAL APPLIANCE Vernon E. Britt and Ernest A. Goetze, Merced, Calif.
- Application December 29, 1944, serial No. 570,231
(ci. ca -26) 14 Claims.
Another object of the invention is to providean appliance of the character described which can be incorporated with the dental handpiece without materially increasing the size or weight of the unit or interfering with the normal use of the handpiece.
A further object of the invention is to provide an appliance of the character described in which the supply of the` material to the tool will be effected by operation of the handpiece and will at all times be under the control of the operator.
A still further object of the invention is to provide an appliance of the character described` sectional view of the attachment shown in Figure 1.
` Figures 3 and 4 are transverse sectional views taken on the lines 3,-3 and 4-4 of Figure 2.
Figure 5 is a side elevation of the'means of our invention embodied in a form different from that shown in Figures 1 and 2.
Figures 6 and 7 are enlarged fragmentary longitudinal sectional views of the forward and rear portions of the appliance as shown in Figure 5.
Figures 8 and 9 are transverse sectional 'views y of the appliance taken on the lines 8-8 and 9-9 of Figure 5. i Figure l0 is a transverse sectional View of the appliance taken on the line I ll-I IJ of Figure;
in which the material to be delivered by the ap-` pliance can be contained in a magazine attached directly to or contained within the supporting body of the handpiece and furthermore it is` an object to permit. replenishment of the supply of material in the appliance in a very easy and quick manner.
And additional object of the invention is to so design the appliance that while the material is caused to pass through certain of the rotating parts such as the tool supporting mandrel of the handpiece there'will be no danger of any portion of the material escaping into the bearings or between any other of the surfaces of relatively moving parts within the handpiece.
The invention Apossesses other objects and features of advantage, some of which, with the foregoing, will be set forth vin the following description of the preferred form of the invention which is illustrated in the drawings accompanying 'and forming part or the specification. understood, however, that variations in the showing made by the 'said drawings and description may be adopted within the scope of the invention as set forth in the claims.
` Referring to said drawings:
Figure 1 is a side elevation of the means of our invention as applied to a conventional dental handpiece, parts being broken away and shown in section` Figure 2 is an enlarged longitudinal vertical It is to be Figure 11 is a longitudinal sectional viewof av handpiece attachment showing a still further modified Vform of the invention.
As aboveset forth, the means of our invention is arranged to be applied to a .dental handpiece and may be incorporated as a built in part thereof or combined therewitlrasanattachment. In the embodiment illustrated in FiguresV 1 and 2, the means is incorporated in an attachment or extension 4I2 designed to be affixed to an end VI5of a yconventional handpiece I3 to provide a contraangle head for holding the various dental tools, such as drill bits, grinding points `and the like.
In the design of dental handpiece illustrated, vthe handpiece includes a hollow supporting body I6 in which is mounted for rotation a tubular spindle I1 arranged to be driven by a pulley I8, the body being borne by a bracket I9 extending Y Vfrom an articulated frame 2|, on which is carried driving parts for rotating the pulley in the well `known manner. In this type of handpiece, a chuck 22 is located Within the end portion I5 of the body I6 forreceiving and holding; the stem or mandrel of a tool or the shaft of an extension member, such as a contra-angle attachment.
` `As here shown, the attachment I2 comprises a tubular body or housing formed of two `main sections 23 and 24, the section 23 being designed at oneend for attachment to the end I5 of the handpiece, while the section 24 is secured to the other end 6 of the section 23 and -forms the head or tool bearing portion of the attachment. Attachment of section 23 to the body I6 of the handpiece is preferably eiected by inserting the to engage the body I6, is in the form of a coupling 21 firmly secured to the section and having an adapter portion 28 arranged to t over the portion |5.
Within the outer end portion 29 of the head section 2li is a mandrel 3| which is mounted for rotation in angular relation to the longitudinal axis of the main body of the attachment in bearings 32 and 33 at opposite sides of the end portion 29. A driving connection for the mandrel is afforded by means of a shaft 34 mounted in a bearing 36 in the head section and having aflixed thereto a bevel gear 31 meshing with a bevel gear 58 aixed to the mandrel. Shaft 34 which is also angularly disposed with respect to the axis of section 23 is connected by means of auniversal joint 39 to a shaft 4| for detachable connection adjacent the end portion I with the spindle I1 of the handpiece |3. As will be understood, the outer end of shaft 4| is arranged to engage in the chuck 22 when the end I5 of the handpiece is inserted'in the bore 26, and in this manner when the attachment is operatively connected to the handpiece, shaft 4| will be rotated by the spindle |1 in the same manner as a tool stem or mandrel inserted in the chuck.
As is well known, it is customary for dentists, particularly when grinding or polishing a patients teeth, to apply to the teeth or the grinding or polishing tool, a quantity of an abrasive or polishing substance usually in the form of a paste. This operation as heretofore conducted involves frequent interruption of the grinding or polishing operation, entails conduction of the operation with varying amounts of the paste, and
the application of the paste in an uncertain and relatively inefficient manner. kIn View of the foregoing, our appliance is designed to provide, under control of the operator, a continuous and steady supply of an appropriate amount of the paste tothe tip'of the tool while the latter is being rotatedA andapplied to the teeth, the paste being withdrawn from an ample supply stored in a magazine or reservoir carried by the appliance. As will be clear from Figure 2, the mandrel 3| is positioned in the head portion 29 with one endfiZ protruding outwardly therefrom and formed to receive and support thereat for rotation with the mandrel a tool or tip such as the polishing cup 43. The mandrel, it will be noted, is formed with a longitudinal passage 44 which as here shown extends completely through the mandrel and is arranged to register with an Yopening or passage 46 provided in the tool 43 and leading tothe exposed recess 41 therein. Means is provided for feeding to the .passage in the mandrel and into the opening 46, a continuous supply of the substance which is desired to be used in the operation such as the abrasive or polishing paste above referred to. Arranged as shown in Figure 2. within the body'section 23 of the attachment is a container or magazine 48 having an outer shell 49 which is preferably 'formed separate of and its the wall of the section and an inner shell 50 which is disposed about Vthe shaft 5| and forms in part with the shell 59 a storage or supply chamber 5| for the'paste 52. One end of the container i8 is closed by a, wall 53 vand has provided therein an outlet nipple 55 which is connected as here shown by preferably fitted loosely against the passage walls and in order to provide against leakage or escape of the paste through the end 58, a stuffing box 59 is provided on the adjacent portion of the section 24 and formed to enclose the end 53 and the connection 51. Desirably the walls of passage i4 are formed to diverge from the inlet to the delivering end as a means of facilitating the flow of the paste through the passage.
Asa means of forcing the paste from the chamber 5| into the various passages to the recess 41 in the tool, there is mounted for reciprocation in the chamber a. plunger 6| which engages the shell 59 and has formed therein a central opening to accommodate the shaft 4| and the shell 55 therearound. At the inner side of the plunger is preff erably provided a exible packing disc 52 formed means of a flexible tube 55 to an elbow 51 leadingV directly into the mandrel passage Mat the end 58 opposite the cup 53. Since the mandrel is designed to rotate, the `portion of the elbow or connection 51 disposed within the passage is to engage both shells, and. thus provide a sealed Vjoint thereat. As will be clear, when the chamber 5l is filled with paste and the plunger is in the retracted position shown in the drawings, on appropriate forward movement of the plunger the paste will be forced out through the nipple 54, and thence through the tube 5i; and passages 44 and 46.
Movement of the plunger to force the material from the chamber 5! is arranged to be effected by power applied from the spindle l1. For ccnverting the rotative powerof the shaft to effect rectilinear movement of the plunger there is provided a screw 634 adapted to be rotated by the shaft and having engaged therewith by means of a, correspondingly threaded clutch 55, a stem 65 arranged to engage the plunger exteriorly of the chamber. The screw is here shown in the form of an exteriorly threaded sleeve surrounding the shaft and loosely fitted within the stem SS which is also preferably of tubular construction. Clutch Brtcomprises a set of jaws 51 supported in a ring 68 slidably fitted in they section 23 and havin-g an arm 59 riding in a slot 1| in the section to keep the ring and jaws from rotating. The jaws are normally held in a retracted position out of engagement with the screw, but may be moved into engagement by a contraction ring 12 affixed to the end of stem G5 and held from .rotating by an arm 1|! in the slot 1|, the contraction being eifected when both rings are moved into cooperative relationship as illustrated in Figure 2. The rings may be held in operative relation with the jaws engaged with the screw by meansof ay catch 13, and it will thus be clear that with the jaws held in contracted position, the clutch, the stem, and the plunger will be moved longitudinally when the screw is rotated. It is` important to note that with the plunger advancing means designed as thus described, no portion thereof including the screw will come in contact with the paste in the chamber, and furthermore since the screw is not required to extend through the plunger or other part of the` container 45, the difficulty of maintaining the chamber in a sealed condition will be avoided.
Since the speed of rotation of the spindle and shaft is normally required to be relatively high, such as-about 1800 revolutions per minute, it becomes advisable with the appliance in the form shown, to provide for a considerable reduction in speed in respect to the screw in order that the paste will be delivered to the tool gradually and of a desired quantity to the tool for a period of operation amounting to approximately ten minutes. Then with the screw provided with 30 threads per inch, and with a stroke of the plunger of approximately two inches, to substantially evacuate the chamber, it will be advisable that a speed reducing mechanism be operatively inserted between the shaft 4| and the screw which will reduce the speed of the screw to approximately 6 revolutions per minute. In accordance with the above, there is interposed between the shaft and screw a speed reducing unit 14, or a design which will provide for a maximum reduction in the speed within minimum space, and as here shown the unit 'M is in the form of a chain of gears 15 to 80 inclusive, arranged in a planetary relationship in a well known manner; the gears l and 80 being secured to the shaft and screw respectively. The unit 14 is positioned directly within a portion S2 of section 23 of the appliance preferably adjacent the end 28 and such portion can be readily enlarged as in the embodiment illustrated in Figures 5 and 6, to accommodate a larger size of said unit. Desirably the unit is enclosed within a housing 83 which is fitted within the portion 82 and is secured against rotation relative thereto. A snap ring 84 engaging the outer end of the casing and a groove in the portion 02 is provided in order to hold the unit against longitudinal displacement.
Since the arm l0 projects from the slot such arm provides an indicator for apprisingthe operator of the progress of the plunger within the container, and then he may readily guage the amount of paste remaining in the container, and as a positive as well as automatic means for preventing the plunger from striking the end wall 53 of the container, the screw is foreshortened sufliciently so that before the plunger may reach the wall, the jaws will become disengaged from the screw and thereby prevent further advance of the plunger by the screw.
As an important feature of the appliance, the container 48 is preferably made in the form of a removable cartridge or capsule, so that replenishment of the paste in the appliance may be effected by simply replacing the empty container with a charged rell cartridge. Desirably the plunger, and preferably the tube 56 are included as pre-assembled parts of the relled cartridge, and in this manner the contents thereof will be kept in a clean and sanitary condition before, as well as after, the cartridge is inserted in the appliance, and. at the saine time there will be no necessity for cleaning out any ofthe `passages leading from the cartridge to the mandrel. In order to facilitate ready removal of exhausted cartridges and re-insertion of charged, the sections 23 and 2d are demountably connected at a point adjacent the end 53 of the cartridge, and are provided thereat with telescopic portions 86 and 87. which are frictionally held together, the portions being suitably recessed to accommodate the nipple 54, which extends from the container and serves to maintain the sections in alignment and against rotational displacement. In order to retract the stem in connection with the refilling operation, it is merely necessary to release the catch 13 and operate the appliance with the shaft rotated in a reverse direction until the jaws are retracted sufficient to release them from engagement with the screw threads, the clutch and stem members may then be freely retracted manually to starting position and reengaged for the advancing operation. i Y
In the embodiment Where the means of :our invention is incorporated directly as a part ofthe dental handpiece, delivery of the paste to the mandrel will be arranged for irrespective of whether the mandrel is supported directly by the handpiece or is carried by an attachment 88 applied tothe handpiece as an accessory thereto, as illustrated in Figures 5, 6, and 7. In this embodiment as illustrated, the handpiece 89 has included therein the speed reduction means 9| which is here shown of the same design and construction as the unit 14 and is secured directly to the spindle 92, the screw 93, and the clutch 94. Preferably the paste container 9B is arranged to be removably carried on the exterior of the handpiece housing 91 and affixed thereto by means of a spring clip 98, and the member 99 of the clutch is extended outwardly of the housing 91 to engage the stem |0| which is arranged to bear against the plunger |02 of the container 0. It will thus be clear that the functioning f the paste expelling mechanism is similar in operation to the arrangement illustrated in connection with the first mentioned embodiment. Delivery of the paste from the container to the man: drel is afforded by means of a tube |03 which is attached at one end tothe outlet nipple |04 of the container and at the other end to the mandre connection |06. i
It will be noted that since the paste container is associated with vthe handpiece not only can the attachment be of relatively short length but the exterior thereof,as in the previous embodiment, is devoid of any obstructive protuberances, and therefore the appliance may be inserted within the oral cavity and otherwise operated with the same facility as appliances which lack the advantages of the present invention.
In Figure 1l `we have shown an additional form of the invention of the type in which the paste supply means is incorporated with the attachment rather than to the hand piece. i The structure in this embodiment is of a more simpliiiednature than as shown in Figure 1. The plunger -SI' of the paste container 48' is simply threaded for engagement with the screw 63 which is rotatably supported in a bearing portion in the end wall 53 of the container so that upon rotation of the screw theA plunger will be advanced to expel the paste.
We claim:` l l. In a dental appliance, the combination with a dental handpiece having a tubular body member and a rotatable spindle mounted therein and operatively associated with a chuck adjacent one end of said member` of a'tubular extension member detachably secured to said body member at said end thereof, a shaft mounted for rotation in said extension member and detachably engaged at one end with said chuck, a tool mandrel carried by said extension member and operatively connected to the other end of said shaft and having a passage extending longitudinally therethrough, a polishing tool carried at one end of said mandrel having an opening exposed thereon and communicating with said passage, a maga-` zine containing an abrasive `or the like carried by one of said members and with the interior in communication with said mandrel passage, an ejector mounted for movement in said magazine for expelling said abrasive therefrom intosaid passage, and a driving connection between said shaft and ejector.
2. A dental appliance in accordance with claim 1, in which said magazine is positioned within said extension member.
-of said body having a driving connection with said unit and provided with a passage therethrough, an abrading tool carried by said mandrel exteriorly of the body and having an opening communicating with said passage and leading to the exterior of the tool, a reservoir for abrasive material carried by said body member and having the interior thereof in communication with Vsaid passage, and means operative by said rotatable unit to discharge the material from said reservoir into said passage on rotation of the unit.
5. In a dental appliance of the character described, a tubular body'member, a driving unit extending longitudinally through said member, a rotatable mandrel supported in said member in angular relation to said unit and having a passage therethrough, a tool carried by said mandrel at one end thereof and outwardly of the body and having an opening in communication with said passage, a reservoir for paste or the like carried by said member, a conduit from said reservoir extending into said passage, and power operated means operating independently of said tool for expelling the material from the reservoir through said conduit.
6. In a dental appliance of the character described, a tubular body member, a driving unit extending longitudinally through said member, a rotatable mandrel supported in said member in angular relation to said unit and having a passage therethrough, a tool carried by said mandrel at one end thereof and outwardly of the body and having an opening in communicationwith said passage, a reservoir for paste or the like carried by said member, a conduit from said reservoir extending into said passage, means for expelling the material from the reservoir through said conduit and a speedA reduction means operativelyconnected to said unit and with said ejector means.
7. In a dental appliance of the character described, a tubular body member, a driving unit extending longitudinally through said member, a rotatable mandrel supported in said member in angular relation to said unit and having a passage therethrough, a tool carried by said mandrelat one end thereof and outwardly of the body and having an opening in communication with said passage, a reservoir for paste or the like carried by said member, a conduit from said reservoir extending into said passage, means for expelling the material from the reservoir through said conduit, a speed reduction means connected to said unit, and means releasably connecting Said reduction meansrto said ejector to advance the ejector upon rotation of said unit.
8. In a dental appliance, a tubular body member having a hollow head section and a hollow body section providing a handle for themember, a shaft mounted for rotation in said body handle section and having an extension positioned within said head, a rotatable mandrel mounted in said head in angular relation to said shaft and having a driving connection therewith, said mandrei having a longitudinal passage extending therethrough, a tool arranged for mounting on said mandrel to project outwardly of said head, a
fixed conduit extending through said head and into Yengagement with said mandrel in communication with said passage, a stuffing box about said conduit and the portion of the mandrel with which it is engaged, and a reservoir for paste carried by the handle section of said member having the interior thereof in operative communication with said conduit. V
9. In a dental handpiece, a tubular body member providing a handle portion, a unit mounted for rotation therein, a speed reduction means for said unit adjacent one end of said body, a rotatable mandrel at the other end of said body having a driving connection with said unit and provided with a passage therethrough, an abrading tool carried by said mandrel exteriorly of the body and having an opening communicating with said passage and leading to the exterior of the tool, a reservoir for abrasive material carried by said body member along said handle portion and having the interior thereof in communication with said passage, and means operatively connccted with the speed reduction means for forcing the material from the reservoir for supply to said tool.
10. In a dental appliance for supporting a rotatable tool carrying mandrel, a tubular body member providing a handle portion, a rotatable unit mounted therein and having a connection with said mandrel for rotating same, a cartridge removably fitted Within the handle portion of said body andv arranged to contain a charge of material of paste-like consistency and having a discharge opening therein, a plunger in said container mounted to expel the material upon advance therein, means extending through said handle portion for advancing said plunger, and means providing a passage from said discharge opening to said mandrel.
11. A dental appliance in accordance with claim l0, characterized by a tube extending through said cartridge and said plunger and surrounding said unit and combining with the cartridge walls to seal the contents thereof from the exterior of the cartridge.
12. In a dental appliance, the combination with a dental handpiece having a tubular body and a rotatable unit mounted therein and arranged to have a tool mandrel carried by the unit, a cartridge removably fitted with'in said body and arranged to contain a charge of material of pastelike consistency and having an outlet therefrom, a connection for delivering material from said outlet to said mandrel, said cartridge having affixed thereto a tubular portion itting around said unit and sealing the material therefrom, a plunger mounted in said cartridge movable therethrough to expel the material through said outlet, a stern engaging said plunger outwardly of said cartridge, a rotatable threaded sleeve surrounding said unit and arranged for operative connection with said stem to move the stern longitudinally of said body and advance said plunger on rotation of said unit, and means interconnecting said unit and sleeve to reduce the relative speed of rotation of said sleeve with respect to said unit.
13. In a dental appliance, the combination with a dental handpiece having a tubular body and a rotatable unit mounted therein and arranged to have a tool mandrel carried by the unit, a cartridge removably fitted within said body and arranged to contain a charge of material of pastelike consistency and having an outlet therefrom, a, connection for deliveringmaterial from said outlet to said mandrel, said cartridge having affixed th'ereto a tubular portion fitting around said unit and sealing the material therefrom, a plunger mounted in said cartridge movable therethrough to expel the material vthrough said outlet, a hollow stem operativelylengagin'g the said plunger outwardly of said cartridge and disposed about said unit, a rotatablescrew threaded sleeve positioned within said stem and surrounding said unit and part of the tubular portion of the cartridge, a speed reduction means interconnecting said unit and sleeve to rotate th'e sleeve at a lesser speed than the unit, and a clutch member releasably and operatively lconnecting said sleeve and stem for relative longitudinal displacement upon rotation of the sleeve.
14. A dental appliance adapted for attachment to a dental handpiece having a rotatable tool chuck, comprising a tubular body, a paste container removably tted within said body, a shaft extending through said cotnainer and arranged for operative connection with Vsaid chuck, a rotatable mandrel carried by said body operatively l connected for rotation with' said shaft, means to convey the paste from the container to the mandrel, a screw surrounding said shaft and extendl0 ing through said container, a plunger fitting in saidA container and supported .therein for longi-V,
15 between said screw and shaft.
,VERNON E. BRITT.
ERNEST A. GoETzE.