US3778903A - Dental unit - Google Patents

Dental unit Download PDF

Info

Publication number
US3778903A
US3778903A US00127098A US3778903DA US3778903A US 3778903 A US3778903 A US 3778903A US 00127098 A US00127098 A US 00127098A US 3778903D A US3778903D A US 3778903DA US 3778903 A US3778903 A US 3778903A
Authority
US
United States
Prior art keywords
dental
valve
instrument
air
arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00127098A
Other languages
English (en)
Inventor
J Gardella
A Ciavattoni
J Ujvary
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SS WHITE COMPANY
Pennwalt Corp
Original Assignee
Pennwalt Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pennwalt Corp filed Critical Pennwalt Corp
Application granted granted Critical
Publication of US3778903A publication Critical patent/US3778903A/en
Assigned to S.S. WHITE COMPANY, THE reassignment S.S. WHITE COMPANY, THE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PENNWALT CORPORATION A PA. CORP
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G15/00—Operating chairs; Dental chairs; Accessories specially adapted therefor, e.g. work stands
    • A61G15/14—Dental work stands; Accessories therefor

Definitions

  • ABSTRACT A dental unit includes an inverted generally T-shaped frame with a supply section located on one side of the upright portion of the frame, andan evacuation section on the other side thereof; the evacuation section includes an evacuation instrument removably supported on a front side thereof, this section being rotatably mounted to the horizontal portion of the frame so that the front side thereof may be rotated to face in any one of an infinite number of positions located within a 180 are as measured in a horizontal plane.
  • a vertical post is supported within and extends upwardly above the upright portion of the frame, and also above the above mentioned sections.
  • a horizontally extending arm assembly is rotatably mounted at one end thereof to the upper end of the post, and supports a tray assembly at the other end thereof, the tray assembly having a plurality of dental drills removably supported thereon; the arm and tray assemblies may be retracted to a position over the above mentioned sections.
  • the unit includes an outlet into which a prophylaxis unit plug canbe inserted so that a single foot control unit can be used for operating both the dental drills and the prophylaxis unit.
  • PATENTEDUEB 18 I975 SHEET 11UF11- INVENTORS, JOHN M.GARDELLA THONY CIAVA NI JOSEPH I. UJVA 11 2M u h/M ATTORNEY DENTAL UNIT BACKGROUND OF THE INVENTION
  • This invention relates to dental units; more particularly, it relates to dental units of the fixed or stationary type, i.e., a dental unit which is customarily mounted to the floor ofa dental office and which contains a plurality of dental devices utilized by a dentist or his assistant.
  • the assistant may work from the side of the chair on which a dental unit is mounted, while the tray and arm assemblies are positioned across the body of the patient to allow the dentist to work from the opposite side of the dental chain-However, due to the construction of these dental units the desired flexibility is not always obtained.
  • the arm and tray assemblies are rotatably supported in such a manner that the degree of rotation is limited because of interference with the cabinet structure of the unit.
  • the arm assembly for supporting the tray and the dental handpieces is of the parallel arm type construction in which the individual arm members rotate about a substantially horizontal axis with respect to each other the raising and lowering of the tray assembly.
  • the weight of the arm and tray assemblies tends to make the setup unstable. This is especially true if the tray assembly contains additional tools, etc., which add to the total weight which must be supported. In all of these dental units, the tray and arm assemblies cannot be retracted to a position in which the assemblies are positioned over the cabinet structure of the dental unit to provide a compact arrangement when the unit is not in use so as to occupy the least amount of space possible within a dentist offlce.
  • Another disadvantage associated with present dental units is that when the dentist desires to utilize a separate prophylaxis unit, this prophylaxis unit is supplied with a separate foot control for operating the same which means that the dentist is burdened with the necessity ofhaving two foot controls, one for the dental handpieces located upon the dental unit, and a second foot control for operation of the prophylaxis unit.
  • foot controllers or foot control units are utilized for actuating dental handpieces upon removal from their hangers, in the event that two handpieces are simultaneously removed from their hangers, actuation of the foot control unit would operate both handpieces simultaneously in present dental units.
  • Manual means may be provided to shut off the supply of fluids to one of the handpieces while it is removed from its hanger, but this has the disadvantage of adding an extra step which must not be forgotten when simultaneously removing two handpieces from their hangers. This may occur in the event that the dentist wishes his assistant to change a bur in one of the removed handpieces, while the dentist simultaneously utilizes a second dental handpiece for operating on the patients teeth.
  • Another problem associated with many dental units of the stationary type is that they do not have the flexibility necessary to permit an individual dentist to locate the unit within his offlce according to his preferred mode of operation. For example, one dentist may prefer utilizing an assistant most of the time, while another dentist may operate alone. In the event that an assistant is used the dentist may prefer the assistant to work from one side of the chair while he works from the opposite side. Also, whether the dentist is right-handed or lefthanded will be a factor in determining the location of the dental unit with respect to the dental chair. Many dentists will prefer to locate the dental unit on one side or the other of the chair, while many others prefer to locate the unit behind the dental chair out of the sight of the patient while seated. Any one or a combination of these factors may be present in determining the exact location of a dental unit within the office of an individual dentist. Present dental units do not provide the flexibility needed to permit the many alternate positions which may be desired by a dentist.
  • the present invention relates to a dental unit of the flxed or stationary type which is mounted to the floor of a dental office, and due to the flexibility and construction of the unit may be mounted along either side of the chair, in back of the dental chair, or in numerous other positions as desired by a particular dentist.
  • the dental unit includes a base frame which is in the form of an inverted substantially T-shaped member.
  • a supply section which houses the incoming supply lines for delivering air, gas, water, and electricity of the dental unit.
  • an evacuation section having at least one dental evacuation instrument removably supported on a front side of this section. This evacuation section.
  • the evacuation section houses the evacuation system utilized for removing various fluids from the dental unit and/or patients mouth.
  • the evacuation section is rotatably mounted to the horizontal portion of the frame so that the front side of the evacuation section which contains or supports the evacuation instrument can be rotated to face in any one of an infinite number of positions located within a arc as measured in a horizontal plane.
  • Mounted on a second side of the evacuation section is a cup filler/cuspidor assembly which is easily and quickly removable so that the latter may be placed upon the opposing side of the evacuation section if desired. This may be necessary, for example, when rotating the evacuation section from one extreme position to the other extreme position located 180 away.
  • This cup filler/cuspidor assembly may include either a fixed cuspidor bowl, or a flushing funnel which is removably mounted in a holder, and which may be held by the hand of a patient or a'dental assistant.
  • a vertical post mounted within the upright portion of the frame.
  • This post is telescopically disposed within the upright portion so that it may be raised and lowered but in any event the upper end of the post is located above each of the above mentioned sections and also above the upright portion.
  • the upright portion of the frame has an open area disposed therein, the open area 'being disposed within the supply section; hingedly mounted over the open area are two supply modules, each of which contains a plurality of supply system components. Upon removing the cabinet structure defining the supply section, these modules may be swung away from the open area over which they are located to provide easy access to the vertical post and its telescopic mounting means. This not only enables easy servicing or adjustment of the vertical post and its telescopic mounting means, but also permits'easy access to thesupply system components mounted on the individual supply modules.
  • a horizontally extending arm assembly which includes two individual a-rm members which are connected so as to allow the individual arm members to rotate about a vertical axis with respect to each other.
  • a tray assembly is rotatably connected so as to rotate about a vertical axis, the tray assembly removably supporting a plurality of dental handpieces or drills to be utilized by the dentist.
  • the tray assembly and consequently the dental handpieces supported thereon may be moved in an infinite number of arcs with the center line of the vertical post forming the axis of rotation, or with the axis of rotation being the vertical axis extending through one of the other rotary connections between the individual arm members, or between the outer arm member and the tray assembly.
  • Construction of the arm and tray assemblies in this manner also permits a substantial portion of each of the assemblies to be retracted to a position over the supply and evacuation sections, thusallowing the dental unit to be compactly arranged when not in use.
  • Another feature of the present invention is the provision of a separate instrument or handpiece holder which is swingably connected to one side of the tray, the tray and instrument holder combined forming the above mentioned tray assembly.
  • the instrument holder may be swung from a position alongside the tray to a position substantially 90 away wherein the dental handpieces which are removably supported on the front side of the instrument holder are substantially in line with the front of the tray proper. This allows the dentist to position the tray so that the front thereof is facing a patient as he is seated in the dental chair, while positioning the instrument holder so that the dental handpieces face the side of the chair from which the ity in removing and replacing dental handpieces from and into their respective hangers.
  • the dental handpieces are removably supported in individual hangers, and upon lifting a selected handpiece from its respective hanger, the supply system is programmed so that upon actuation of a foot control unit, the appropriate fluids will be delivered to the handpiece.
  • a foot control unit upon lifting a selected handpiece from its respective hanger, the supply system is programmed so that upon actuation of a foot control unit, the appropriate fluids will be delivered to the handpiece.
  • one of the hangers is manually moved to a lowermost position in which it is held by a latched mechanism, thus preventing any fluids from being delivered to that particular handpiece upon actuation of the foot control unit.
  • this situation may arise when a dentist wishes his assistant to change or insert a but in one dental handpiece while the dentist is simultaneously utilizing a second handpiece.
  • the dental unit is provided with an outlet, which outlet is electrically connected to thefoot control unit utilized for controlling the operation of the individual dental handpieces.
  • This outlet cooperates with a corresponding plug connected to a prophylaxis unit.
  • the prophylaxis unit may be operated with the same foot control unit utilized for operating the dental handpieces. This is accomplished by moving a selector switch located on the dental unit to the appropriate position. This enables a dentist to utilize a separate prophylaxis unit without the necessity of having a separate foot control unit for operating the same as was heretofore the case BRIEF DESCRIPTION OF THE DRAWlNGS ply modules containing supply system components.
  • FIG. 4 is a cross-sectional view taken through line 44 of FIG. 2 showing the vertical post on which the horizontally extending arm assembly, and tray assembly are supported.
  • FIG. 5 is an enlarged view of the means for rotatably connecting the arm and tray assemblies.
  • FIG. 6 is a cross-sectional view taken through line 6-6 of FIG. 4, and illustrating the means for rotatably mounting the horizontally extending arm assembly to the vertical post.
  • FIG. 7 is a cross-sectional view taken through line 7-7 of H6. 2, and illustrating the means by which the evacuation section may be rotated to any one of an infinite number of positions within a are on the inverted T-shaped member, the evacuation section being in one extreme position.
  • FIG. 8 is a cross-sectional view similar to FIG. 7 showing the evacuation section rotated to the other extreme position 180 removed from the position illustrated in FIG. 7.
  • FIG. 9 is a cross-sectional view taken through 99 of FIG. 7.
  • FIG. 10 is a cross-sectional view taken through line 10-10 of FIG. 4 showing adjustable bearings utilized for supporting and guiding the vertical lifting post.
  • FIG. 11 is a cross-sectional view taken through line 11-11 of FIG. 4 showing a detent plate mechanism for retaining the vertical lifting post in a desired vertical position, and a means for releasing the detent plate.
  • FIGS. 12a, 12b, 12c and 12d are cross-sectional views taken through lihe l2-l2 of FIG. 4, and showing successive positions of the pin and grooves in the connection located between the tray assembly and the arm assembly upon rotating the tray assembly in a clock-wise direction with respect to the horizontal arm assembly.
  • FIG. 13 is a cross-sectional view taken through line 1313 of FIG. 1 showing the cup/cuspidor assembly, and a means for quick-connecting/disconnecting the assembly to the assistant section.
  • FIG. 14 is a cross-sectional view taken through line 14-14 of FIG. 13 showing an L-shaped manifold utilized for connecting a cup/cuspidor assembly to one side of the evacuation section. 7
  • FIG. 15 is a cross-sectional view taken through line I5-l5 of FIG. 14 showing the slots on the cup/cuspidor assembly which are utilized for supporting the assembly on the L-shaped manifold illustrated in FIG. 14, and also showing various fluid openings in the assembly which register with corresponding openings in the manifold.
  • FIG. I6 is a cross-sectional view taken through line I6l6 of the instrument holder shown in FIG. 2, and illustrating the means for locking each individual handpiece hanger in its lowermost position when the dental handpiece is removed, and also showing a three way pilot valve which is normally actuated upon removing a dental handpiece from its associated hanger.
  • FIG. 17 is an enlarged view of the area encircled in FIG. I showing the particular arrangement for swingably connecting the instrument holder to one side of the tray proper.
  • FIGS. 18A through 18C illustrate the fluid flow system for the present dental unit.
  • FIG. 19 is a schematic drawing illustrating the electrical system for enabling a prophylaxis unit to be operated by the same foot control unit utilized for controlling the dental handpieces.
  • FIG. 20 is composed ofviews (A), (B), (C), (D), (E) and (F) showing various alternate positions in which the present dental unit may be placed with respect to the dental chair, and alternate positions for the evacuation section with respect to the remainder of the dental unit.
  • FIGS. 1 & 2 a top view of the dental unit I0 is illustrated showing a supply section 12, and an evacuation section 14, these sections being located on opposite sides of a vertical or upright portion 16 of a base frame comprised of an inverted generally T- shaped member 18. Telescopically supported within the upright portion 16 is a vertical lifting post 20, this post being utilized for supporting a horizontally extending arm assembly 22, which arm assembly in turn supports a tray assembly 24; this tray assembly is comprised of a tray proper 26, and an instrument holder 28 having a plurality of individual instrument hangers extending from a front side thereof, the hangers removably supporting a plurality of dental handpieces (instruments).
  • Instrument holder 28 is swingably connected to one side of the tray 26 to permit the holder to be moved from the position shown in FIG. 1 wherein the dental handpieces 60 are substantially aligned with the front side of the tray 26 to a position substantially away in a counter clock-wise direction.
  • the tray may bepositioned in front of the patient so that the front side thereof faces the patient as he is sitting in the chair while the holder 28 is rotated approximately 90 so that thehandpieces 60 face the dentist who may be working from one side of the dental chair.
  • the dental handpieces are actuated by operation of a foot control unit 72; upon lifting a selected handpiece from its respective hanger, the supply system is programmed so that upon actuation of the foot control unit 72, the selected handpiece is actuated.
  • a cuspidor assembly 30 which includes a removably mounted funnel 31, which when removed actuates the evacuation system through a two way valve 33 to remove debris from the funnel through a discharge line 35. While inthe present case a removably mounted funnel is shown, a fixed bowl arrangement may also be utilized.
  • the cuspidor assembly 30 also includes an automatic cup filler for filling a cup 37 with water.
  • the supply section 12 houses the incoming supply system for supplying air, water, gas, and electrical power to the dental unit.
  • the main air supply line is identified by the dotted line 32 which connects with a first supply module 34 which is swingably or hingedly mounted to the upright portion 16 of the frame.
  • the main water supply line is identified by the numeral 36 which leads into a second supply module 38, also hingedly mounted to the upright portion 16.
  • the main gas supply line 48 is utilized for delivering gas to a gas burner 50 located on the tray 26.
  • the main electrical supply line is identified by the numeral 52 which leads into a terminal board 54 mounted to the lower portion of the upright portion 16 of the frame. As can be seen more clearly in FIG.
  • the upright portion 16 has disposed therein an open area 40, each of the supply modules being hingedly mounted to the upright portion I6 so that they can be swung away from the open area to expose a vertical lifting post and its telescopic mounting means which are located within the upright portion 16.
  • This not only permits easy access to the vertical lifting post and its mounting means, but also allows easy access to the supply system components which are mounted upon each of the supply modules 34 and 38. Attention is also directed to the nipplelike studs 42, and the apertured brackets 44 for securing the individual panels 46 of the supply section to the frame 18.
  • the cabinet structure defining the supply and evacuation sections are preferably constructed in this manner so that the unit may be easily and quickly dismantled for any necessary servicing or adjustments.
  • the term rapid connecting means is used herein to define the nipple 42, bracket 44 arrangement, and in- .cludes any means for rapidly connecting and disconnecting the cabinet structure to and from the frame 18 without the assistance of tools.
  • the evacuation section 14 houses the evacuation system utilized for removing various fluids and debris from the dental unit to a point of discharge.
  • a plurality of dental evacuation instruments 58 e.g., a saliva ejector, a syringe, and an oral evacuator for high volume removal of debris and waste fluid from the oral cavity.
  • an opening 158 Located on a second side of the evacuation section is an opening 158 having a removably mounted closure 156 for closing this opening.
  • This arrangement is also provided on the opposite or third side of the evacuation section, and these openings are utilized for mounting the cuspidor assembly 30 to either the second or third side of the evacuation section depending upon the position of the section with respect to the remainder of the dental unit 10. This will be described in more detail in subsequent figures.
  • the present dental unit has the evacuation instruments 58 mounted or removably supported on the cabinet structure of the dental unit, while the dental handpieces (which includes both dental drills and syringes) are removably supported on the tray assembly; in FIG. 3 it can be seen that the horizontally extending arm assembly 22 includes a first arm 23 and a second arm 25 rotatably connected to each other so as to rotate about a vertical axis which allows the tray assembly to be pulled across the patient while seated in a dental chair which allows the dentist to workfrom one side of the dental chair while the dental assistant (if one is used) works from the opposite side of the chair.
  • the flexibility provided by the present dental unit is one of the important aspects of the present invention, but will be discussed in greater detail in subsequent figures. But,
  • the dentist may position the present dental unit in numerous alternate positions within the dental office to conform with his particular mode of operation.
  • the dental unit can be placed on either side of the dental chair by appropriately rotating the evacuation section 14 by means of a bolt-washer-slot-nut arrangement designated generally by the numeral 62.
  • the horizontal portion of the frame 18 upon which the evacuation section 14 is mounted may also be removably connected as in dicated at 64 to the remainder of the unit 10.
  • the incoming supply lines of the supply system are connected with one of the supply modules 34 or 38 upon which the supply system components are mounted, or to the terminal board 54. From either the supply modules or the terminal board the supply lines branch out to various parts of the dental unit; for example, air, water, gas, and electricity must all be supplied to the tray assembly 24 as indicated by the numeral 76 (FIG. 4), while only air, water, and electricity need be supplied to the evacuation section 14 as indicated by the numeral 78 (see FIG. 3).
  • Located within the lower portion of the frame 18 are three outlets numbered 66, 68, and 70 for supplying water, electricity, and an electrical connection with the foot control unit 72 respectively.
  • the vertical lifting post 20 is hollow and of circular cross section 'so that the supply lines can be passed through the post and into the horizontally extending arm assembly 22, and into the tray assembly 24.
  • the post 20 is supported within the upright portion 16 of the frame by a bearing unit which includes a plurality of roller bearings in rolling contact with the circular surface of the post 20.
  • An upper set 82 and a lower set 84 of these roller bearings provide firm support for the post, and lend themselves to easy adjustments for firm and smooth rolling contact with the post.
  • Each of the sets of roller bearings includes at least one bearing which in addition to being rotatable about a horizontal axis is also rotatable about a vertical axis for adjustment purposes. This will be discussed in more detail when referring to FIG. 10 below.
  • the mechanism for permitting the lowering of post 20 and consequently. the tray assembly 24 includes a spring assembly 86, a detent plate 88, a piston and cylinder arrangement 90, and a plunger 92 which is adapted to contact the detent plate for releasing the same.
  • Spring assembly 86 which is connected between the upright portion 16 and the bottom of the post 20, acts in opposition to the weight of the post and tray assembly mounted thereon.
  • a handle grip 96 is provided on the tray assembly to permit manual moving of the tray assembly to a desired position.
  • a release button (see FIG. 1) is provided by which air may be delivered to the piston-cylinder 90 for releasing the detent plate 88 in order to lower the tray'assembly 24. This also will be described in greater detail in subsequent figures.
  • the arm assembly includes a first arm 23 and a second arm 25 (see FIG. 3) these arms being connected so as to be rotatable about a vertical axis with respect to each other.
  • FIG. 5 is an enlarged view of the means for rotatably connecting each of the arms 23 and 25 of the arm assembly 22, and also for rotatably connecting the tray assembly 24 to the arm 25. More accurately, while FIG. 5 actually represents an enlarged view of the means for rotatably connecting the tray assembly 24 to the arm 25, it is also representative of the means for rotatably connecting the arm member 23 to the arm member 25.
  • Disposed on the underside of the tray assembly 24 is an annular groove 152 which extends approximately 350 or slightly less than one complete revolution.
  • annular member or plate 148 Disposed on the upper side of the arm 25 is a similar annular groove 154, and located between the tray assembly and arm 25 is an annular member or plate 148 having a pin 150 extending therethrough.
  • the upper and lower ends of the pin 150 cooperate with each of the annular grooves 152 and 154 so as to allow relative rotation between the tray assembly and arm 25 about a vertical axis of more than 360, but slightly less than two complete revolutions or 720.
  • three sets of annular roller bearings 155, 153, and 151 are disposed between relatively movable members, the sets of roller bearings being confined by a two-piece bushing which includes members 157 and 159 secured together by screw means (not numbered). The operation of this connecting means will be described in greater detail when discussing FIG. 12 which follows.
  • FIG. 6 a cross-sectional view taken through line 6-6 of FIG. 4 illustrates the means for rotatably mounting the horizontally extending arm assembly 22 to the post 20.
  • a locator member 179 is rigidly mounted to the upper end of the post, the locator member having two holes 175 and 1.77disposed therein and spaced 180 apart.
  • an annular plate 181 Disposed above the member 179 is an annular plate 181 having a pin I71 extending therethrough.
  • the lower end of the pin 171 is adapted to cooperate with one of the holes 175 or 177 in the member 179.
  • Formed on the underside of the arm 23 is an annular groove 183 which extends approximately 350 or slightly less than one complete revolution.
  • the upper end of the pin I71 cooperates with this annular groove 183 to limit the extreme travel or rotation of the arm 23 about its rotational axis.
  • the arm 23 may be rotated 175 in either direction before one end or the other of the groove 183 abuts this pin.
  • the extreme limits of travel of the arm 23 can be varied 180 merely by rotating the annular plate 181 180 so that the lower end of the pin 171 registers with the hole 175 as opposed to the hole 177.
  • This change would be made, for example, when rotating the evacuation section 14 180 from the position shown in FIG. 1, in a clock-wise direction as viewed from the top of the dental unit, to its other extreme position; As will be more apparent later, this change is made when it is desired to reverse the location of the dental unit and locate the same on the opposite side of the dental chair.
  • FIGS. 7 through 9 illustrate a cross-sectional view of the evacuation section 14 in each of its extreme positions, and the means 62 (see FIG. 3 also) for rotatably mounting the evacuation section of the frame 18.
  • a bolt 126 extends through a washer I28 and extends through a nut 130, the latter being contained within a channel 131 dimensioned so that the nut- 130 cannot rotate therein. While FIGS. 7 and 8 show the extreme positions of the evacuation section 14, it is apparent that the evacuation section may be rotated to any one of an infinite number of positions within this 180 are as measured in a horizontal plane.
  • a slot 122 is disposed within the bottom of the evacuation section 14, and a cooperating slot 124 is disposed in the base frame 18.
  • FIG. 10 more clearly illustrates the construction of the upper set of roller bearings 82 which were briefly described with reference to FIG. 4. Because the upper and lower sets of roller bearings are identical in construction only the construction of the upper set will be described herein.
  • This set of bearings contains two nonadjustable bearings 98, and two adjustable bearings 100; the four individual roller bearings each rotate about a horizontal axis as the post is moved into or out of the upright portion 16 of the frame.
  • the bearings are supported within a mounting block 81 which is connected to the upright portion 16 by means of screws 108 which extend through washers 110 having a depression 112 formed therein, the head of each of the screws 108 being slightly smaller than the diameter of the depression 112.
  • the hole and the washer 110 through which the screw 108 extends is also slightly larger than the threaded portion or shank of the screw, thus allowing a slight lateral movement of the screw upon loosening the same. Therefore, when it is desired to vary the cant of the post 20, each of the screws 108 is loosened thus permitting a slight lateral movement of the mounting block 81 to either the right or left as viewed in FIG. 10.
  • the screw means 116 see FIG. 4) are moved into or out of the mounting block 81 until contacting the inner surfaces of the upright portion 16; after this is done the screws 108 are again tightened by screwing the same into the mounting block 81, securely locking the bearing unit in place within the frame. This assures that the horizontally extending arm assembly 22 and tray assembly 24 are level at all times.
  • the mechanism for holding the vertical post 20 in a desired vertical position is more clearly illustrated. As stated previously,'when it is desired to raise the tray assembly 24, this is accomplished by manual force applied to the hand grip 96 on the front of the tray assembly. Because the detent plate 88 is biased in a downward direction by a spring 89 the post 20 can be raised against plate 88 without moving the plunger 92 against the plate for release. The post remains in a selected vertical position due to the frictional force between the apertured detent plate 88 and the post 20. To move the tray assembly to a lower position, a release button 120 (see FIG.
  • the post and tray assembly may be manually moved to any desired lower position. It is here noted (see FIG. 2) that even in its lowermost position the upper end of the post 20 is disposed above the upright portion 16 and the supply section and evacuation section. This allows the tray assembly to be retracted to a position in which both it and the horizontally extending arm assembly 22 are located above the latter mentioned sections. This permits the dental unit to be compactly arranged when the tray assembly is not being utilized.
  • Another of the important features of the present invention is the flexibility afforded the dentist in manipulating or moving tray assembly 24 to any desired position, depending upon the mode of operation of the dentist. This is due to the unique construction of, a method of mounting the arm and tray assemblies to the frame of the dental unit.
  • the means for rotatably mounting the arm 23 to the post 20 includes an annular groove 183 which allows rotation of the arm about the post 20 approximately in either direction from its midpoint position which is illustrated in FIG. 6.
  • the evacuation section 14 is rotated from the position indicated in FIGS. 1 and 3, it is necessary to also rotate the locator member 181 180 so that the pin 171 is aligned with the other hole 175 located in the locator member 179.
  • This might be done for example when reversing the location of the dental unit with respect to the dental chair, i.e., when removing the dental unit from one side of the chair and relocating the same on the opposite side of the chair. This would then permit the arm 23 to stop in the proper place upon rotation due to the reversed position of the dental unit.
  • FIG. 5 is an enlarged view of, and that illustrated in FIGS. 12a through 12d is a cross-sectional view of, the means for rotatably connecting the tray assembly 24 to the arm 25, this construction is also identical to that which is used for rotatably connecting the arm 23 to the arm 25. In each case approximately 700 of rotation, or slightly less than two complete revolutions, is permitted between the rotatably connected members or assemblies.
  • This construction combined with the means for rotatably mounting the horizontal arm assembly 22 to the post permits the dentist to move the tray assembly 24 within an infinite number of arcs located within the maximum are which would be generated by rotating the tray assembly about the post 20 with the arm assembly 22 fully extended. Thus, maximum flexibility is afforded the dentist without the danger of undue twisting of the supply line contained within the arm assembly 22, and the tray assembly 24.
  • FIGS. 12a through 12d the operation of the connection for rotatably connecting tray assembly 24 to the arm 25 will now be described.
  • the means for rotatably connecting tray assembly 24 to arm. 25 is identical to the construction for rotatably connecting arm 23 to arm. 25; thus, only the former will be described in detail.
  • pin 150 abuts end 450 of groove 152, while abutting end 454 of groove 154. While the width of each of the grooves 152 and 154 are substantially the same, for purposes of clarity, groove 154 which is indicated by the dotted line is shown as being substantially wider.
  • the groove 152 will also move in a clock-wise direction while the pin 150 remains stationary.
  • pin 150 is eventually located at the approximate midpoint of groove 152 as shown in FIG. 12b.
  • the other end of groove 152 i.e., end 452 eventually contacts pin 150 as shown in FIG. 12c.
  • continued rotation of tray assembly 24 in a clockwisedirectio'n will move pin l50 and consequently annular member 148 in a clock-wise direction until the pin moves the complete distance within annular groove .154; as can be seen in FIGS.
  • tray assembly 24 is capable of being rotated in substantially an unlimited number of arcs over the cabinet structure and frame of the dental unit.
  • the cuspidor assembly 30 (which may also be referred to as the cupcuspidor assembly) is illustrated along with the means for securing the assembly to one or the other of opposite sides of the evacuation section 14. Because the evacuation section may be rotated to any one of an infinite number of positions within a 180 are as measured in a horizontal plane, it may be necessary to reverse the position of the cuspidor assembly when repositioning the evacuation section. As illustrated in FIG. 3, the evacuation section 14 has disposed on either of opposite sides thereof a removable closure 156 adapted to be secured over an opening 158 located on either of these opposite sides.
  • FIGS. 13 through 15 An L-shaped manifold 160 is secured to a partition 162 (see FIG. 1 also) extending across the interior of the evacuation section 14.
  • Manifold 160 has a plurality of fluid passageways designated generally by a the numeral 164, which passageway register with appropriate passageways or fluid conduits in the cuspidor assembly 30, the latter passageways being designated generally by the numeral 166. As can be seen in FIG.
  • the assembly 30 can be quickly mounted anddismounted to and from either of opposite sides of the evacuation section 14 merely by re-' moving the closure from the respective side and placing the assembly 30 over the studs 168; the passageways disposed within the manifold and the cuspidor assembly are automatically aligned, and upon tightening the nuts 170, the assembly 30 is locked into place and sealed against leakage.
  • the instrument holder 28 is provided with a plurality of hangers 176, each of which is supported at the end of a lever 178 extending from the front side of the holder 28, and pivotedly mounted about an axis 196 so as to pivot about the latter in a vertical plane.
  • hanger 176 When a dental handpiece is removably supported in hanger 176, the hanger and lever 178 will assume the dotted line position indicated by the numeral 182.
  • the hanger 176 Upon removing the selected handpiece (a dental drill in this instance), the hanger 176 will be biased to its uppermost position by spring 184, the indicated solid line position beingthe uppermost position.
  • a conventional three-way supply and exhaust valve 190 pilot valve
  • the supply system is programmed to deliver the appropriate fluids to the selected dental drill upon actuation of the foot control unit 72.
  • the three-way supply and exhaust valve 190 is a commercially available product which can be obtained from the Clippard Manufacturing Instrument Laboratories.
  • each of the hangers utilized for supporting a dental drill contains a latch mechanism 192 which is biased in a counter-clock-wise direction with respect to the pivotal axis 196 so as to allow the latching mechanism to be hooked beneath a protrusion 477 disposed on the casing of the instrument holder 28; this lowermost position of hanger 176 is indicated by the dotted line 198, the hanger 176 being held within this lowermost position by the latching mechanism 192, and protrusion 477.
  • one of the instrument hangers 176 may be manually moved to its lowermost position as indicated by the dotted line 198, where it is held by the latching mechanism 192.
  • the plunger 188 of the respective three-way valve 190 will not be depressed, and therefore the respective selector valve for the dental drill will not be opened; consequently upon actuation of the foot control unit 72 only the selected handpiece, i.e., the handpiece associated with the hanger which has reached its uppermost position, will be actuated.
  • P10. 17 is an enlarged view of the area encircled in FIG. 1, showing the means for swingably mounting the instrument holder 28 about an upright or vertical axis to one side of the tray 26.
  • the holder 28 includes a housing with a hollow, curved, arcuate conduit portion 2110 providing an extension of the instrument holder housing which extends into tray 26 when the holder 28 is moved to a position such that the dental handpieces and the front of the instrument housing are aligned with the front of the tray.
  • the instrument holder is pivotally mounted to the tray 26 at a pivot point 202, so that the holder 28 may be swung to a position as indicated by the broken line 204 where the instrument hangers and dental handpieces removably supported therein as well as the front side of the instrument housing, are facing in horizontal direction away from one side of tray 26.
  • the dotted line position indicated by the numeral 204 is approximately 90 from the solid line position in which the dental handpieces are substantially aligned with the front of tray 26.
  • a move may move the entire tray assembly so that the tray 26 faces the patient while he is seated in the dental chair, while removing the holder 28 alongside the tray 26 as indicated by broken line 204 so that the dental handpieces are not inconveniently placed immediately in front of the patient while seated in a dental chair.
  • the arcuate portion 200 is designed to house supply lines leading from the tray 26 into the holder 28.
  • the tray 26 may be p0- sitioned so that the front thereof faces the patient while seated in the dental chair, while the instrument holder 28 may be moved to a position alongside the tray 26 so that the dental handpieces may face the dentist who is working from one side of the dental chair. This allows the'dentist to easily remove and replace dental handpieces without interfering with the comfort of the patleflt.
  • a plurality of fluids are necessary including water, air, and gas, the air being utilized to provide drive air for driving or operating each of the dental drills, and to provide chip blow air for blowing chips or debris away from the work site or cavity.
  • the inflow of water is controlled by a manual shut-off valve 210 which controls the supply of water to the entire dental unit. While this valve is normally open it may be utilized to cut off the flow of water to the entire dental unit when servicing the latter. Large particles of solids or other impurities are removed from the water by a strainer 212.
  • the delivery of water to the dental unit is controlled through a main solenoid valve 214 which in turn is controlled by one or the other of two main switches 8-1 or S-2, one of the switches being physically located on the front of the tray 26, while the other is located on the evacuation section 14.
  • a second water filter 216 further cleans the water of any line particles or impurities which may still be present within the water. The water then reaches junction 218 from where it is diverted into two separate flow paths.
  • One flow path includes a pressure regulator 220 to regulate the pressure of water passing therethrough, and a manual shut-off valve 222 located downstream of the regulator 220 to cut off the supply of water to the cuspidor assembly 30 in the event it is desired.
  • the second flow path into which the water is diverted from the junction 218 also includes a pressure regulator 224 to regulate the pressure of the water.
  • a heater is then itilized to adjust the temperature of the water being delivered to the dental handpieces, and also to the cup filler to produce a water temperature that is comfortable to the patient.
  • the water heater 226 also contains a manual shut-off valve 228 which again may be utilized to shut off the water supply to any point lo cated downstream of the valve 228.
  • valve 234 When the foot control unit 72 is actuated, valve 234 will be opened to allow the water to pass to the dental handpieces.
  • valve 234 After passing through valve 234, the water is controlled by a control valve 240 which is physically located on the front of the tray 26 after which the water flows to three selector valves, 242a, 24212, and 242C, there being one selector valve associated with each of the dental handpieces. A detailed construction of each of these selector valves is illustrated in H6. 18c and will be discussed in more detail later. Each of the selector valves is utilized for simultaneously controlling the flow of fluids through a plurality of fluid supply lines connected with each dental handpiece. Thus after passing through the control valve 240, water is delivered to the inlet of each of the selector valves 242a, 24219, and 2420.
  • This valve while normally open, may be closed in the event that it is desired to stop the flow of air to the dental unit 10.
  • An air filter 250 is utilized for filtering out foreign particles contained within the air stream. After passing through filter 250, the air is delivered to a three way solenoid vlave 252 which is also controlled by one of the main switches S-1 or 5-2 (H6. 19), which switches are physically located on the front of the trayv 26, and on the evacuation section 14. Upon actuation of one of these main switches, valve 252 is opened and air is allowed to flow through the valve to a junction 254, at which point the airflow is divided into three separate paths.
  • a first path delivers air to a diaphragm operated valve 256 which controls gas flow to the gas burner 50 (see FIG. 2 also)v
  • a diaphragm operated valve 256 which controls gas flow to the gas burner 50 (see FIG. 2 also)v
  • the valve is opened, and a supply of gas passes through a manual shut-off valve 258 located within the gas line 260, and is delivered to the gas burner 50.
  • a manual shut-off valve 258 located within the gas line 260, and is delivered to the gas burner 50.
  • the three-way solenoid valve 252 When the three-way solenoid valve 252 is deactuated, air within the pilot chamber within the diaphragm operated valve 256, and within the line 261 is exhausted to the atmosphere through valve 252, thus closing valve 256 and terminating the flow of gas to the gas burner 50. Not only is the air within line 261 exhausted to the atmosphere, but all of the air contained within the air system downstream of valve 252 is exhausted to atmosphere.
  • valve 256 is deactuated
  • a manual shut-off valve 262 is provided to trap the gas contained between the valve and the diaphragm operated valve 256.
  • the manual shut-off valve 262 may be utilized. to terminate the flow of gas to the burner 50 even though the main through a line 264 to an evacuation system which will be described in more detail later.
  • a third path leading from the junction 254 directs air through a line 266 to which a pressure gauge 268 is connected.
  • a pressure regulator 270 regulates the pressure of air being delivered to the chip blow circuit and spray syringe. This pressure regulator 270 reduces the pressure of the incoming air to appropriate levels for the operation of the chip blower disposed on each of the dental drills, and spray syringe. After passing through the pressure regulator 270, the air passes through a check valve 302 and to a line 304 until reaching a solenoid valve 306 which controls the flow of air through line 304.
  • a portion of the air is diverted from line 304 into a line 310 to a syringe 308, this syringe being physically located on the tray assembly 24.
  • Syringe 308 also re ceives a supply of water from the heater 226 via line 233, junction 314 and line 312.
  • Water and air outlets 318 and 320 respectively are provided on the dental unit. Water being delivered from heater 226 into the line 233 is delivered via the latter to the water outlet 318. Air passing through the line 304 is diverted at junction 480 to a junction 481, and from the latter through a line 482 to the air outlet 320.
  • air is delivered from junction 254 through line 266, line 262 to a junction 272, and into a line 274 leading to the foot control unit 72.
  • the foot control unit 272 contains a conventional throttle valve for controlling the flow of air through line 274 to a pilot pressure line 276, and back to a pilot operated regulator 278; a small amount of air is utilized to control the pilot operated regulator 278 by varying the foot control unit which varies the throttle valve contained therein.
  • the foot control unit 72 contains a vertical lever for actuating the throttle valve contained therein to control the amount of air passing from line 274 to line 276, the flow of air into line 276 depending upon the extent of movement of the vertical lever which controls the throttle valve therein.
  • the throttle valve being controlled by the vertical lever of the foot control unit 72 is actually a three-way valve which not only regulates the flow of air from line 274 to line 276, but also exhausts the air contained within line 276 to the atmosphere upon returning the vertical lever to its neutral position.
  • dental drills may be utilized with the present supply system depending upon the preference of the dentist. lllustrated are three drills 282, 284 and 286; dental drill 282 is representative of a commercially available drill utilizing non-lubricated drive air such as the Encore Air Orbit Handpiece available from the Encore Dental Products Co. The two remaining dental drills, i.e., drills 284 and 286 are representative of drills requiring lubricated air for operating the same.
  • An example of a drill requiring lubricated drive air is the Dentsply Silencer Handpiece available from Dentsply International Inc. As illustrated, drill 284 rep-

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
US00127098A 1971-03-23 1971-03-23 Dental unit Expired - Lifetime US3778903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12709871A 1971-03-23 1971-03-23

Publications (1)

Publication Number Publication Date
US3778903A true US3778903A (en) 1973-12-18

Family

ID=22428290

Family Applications (1)

Application Number Title Priority Date Filing Date
US00127098A Expired - Lifetime US3778903A (en) 1971-03-23 1971-03-23 Dental unit

Country Status (11)

Country Link
US (1) US3778903A (enrdf_load_stackoverflow)
BE (1) BE781022A (enrdf_load_stackoverflow)
BR (1) BR7201651D0 (enrdf_load_stackoverflow)
CA (1) CA953543A (enrdf_load_stackoverflow)
DE (1) DE2214248A1 (enrdf_load_stackoverflow)
ES (1) ES401084A1 (enrdf_load_stackoverflow)
FR (1) FR2131520A5 (enrdf_load_stackoverflow)
GB (1) GB1390553A (enrdf_load_stackoverflow)
IT (1) IT954808B (enrdf_load_stackoverflow)
NL (1) NL7203031A (enrdf_load_stackoverflow)
ZA (1) ZA721192B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982322A (en) * 1974-09-12 1976-09-28 Siemens Aktiengesellschaft Arrangement for the switching on-and-off of a pressurized medium flow
US4106198A (en) * 1976-11-12 1978-08-15 Pelton & Crane Company Control arrangement for handpiece instrument
US4430062A (en) 1980-06-13 1984-02-07 A/S Flex Dental Dental apparatus with a number of dental instruments connected to a common control circuit and a common operator unit
US6260287B1 (en) 1997-08-08 2001-07-17 Peter Walker Wet web stability method and apparatus
WO2003051265A1 (en) * 2001-12-14 2003-06-26 Claudio Continolo Dental surgery with equipment
US6716028B2 (en) 2000-08-04 2004-04-06 Hu-Friedy Mfg. Co., Inc. Ultrasonic swivel insert
US6811399B2 (en) 2001-07-27 2004-11-02 Hu-Friedy Mfg. Co., Inc. Torque lock for ultrasonic swivelable inserts and method
US20070148615A1 (en) * 2005-12-28 2007-06-28 Pond Gary J Ultrasonic endodontic dental irrigator
US20090166306A1 (en) * 2007-12-31 2009-07-02 Ahearn David J Delivery channel
US20120056066A1 (en) * 2009-05-15 2012-03-08 Habdank Pv-Montagesysteme Gmbh & Co. Kg Support arrangement for solar modules
US9456948B1 (en) * 2015-03-06 2016-10-04 Sargon Lazarof Dental chair
WO2023113857A1 (en) * 2021-12-13 2023-06-22 Canepa Colt Harrison Dental handpiece that has flush capability

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4386910A (en) * 1980-05-02 1983-06-07 Officine Augusto Cattani & C.S.A.S. Console for suction tubes of suction units used in dentistry
DE3701172A1 (de) * 1987-01-16 1988-07-28 Kreuzer Friedhelm Gmbh Stativsystem
GB2277560A (en) * 1993-04-30 1994-11-02 Itp Limited Adjustable bearing and machine slide
CN109512620B (zh) * 2019-01-14 2020-09-01 杜洪燕 一种门诊护理换药装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050855A (en) * 1957-05-10 1962-08-28 Ritter Co Inc Dental apparatus
US3271859A (en) * 1962-09-07 1966-09-13 Horowitz Norman Dental equipment stand
US3304609A (en) * 1966-02-16 1967-02-21 Horowitz Norman Dental equipment stand
US3514171A (en) * 1968-07-15 1970-05-26 Pelton & Crane Co Dental instrument cabinet and storage mechanism
US3530513A (en) * 1967-09-08 1970-09-29 Weber Dental Mfg Co Dental bowl support construction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050855A (en) * 1957-05-10 1962-08-28 Ritter Co Inc Dental apparatus
US3271859A (en) * 1962-09-07 1966-09-13 Horowitz Norman Dental equipment stand
US3304609A (en) * 1966-02-16 1967-02-21 Horowitz Norman Dental equipment stand
US3530513A (en) * 1967-09-08 1970-09-29 Weber Dental Mfg Co Dental bowl support construction
US3514171A (en) * 1968-07-15 1970-05-26 Pelton & Crane Co Dental instrument cabinet and storage mechanism

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982322A (en) * 1974-09-12 1976-09-28 Siemens Aktiengesellschaft Arrangement for the switching on-and-off of a pressurized medium flow
US4106198A (en) * 1976-11-12 1978-08-15 Pelton & Crane Company Control arrangement for handpiece instrument
US4430062A (en) 1980-06-13 1984-02-07 A/S Flex Dental Dental apparatus with a number of dental instruments connected to a common control circuit and a common operator unit
US4538988A (en) * 1980-06-13 1985-09-03 Frank Henrichsen Dental apparatus with a number of dental instruments connected to a common control circuit and a common operator unit
US6260287B1 (en) 1997-08-08 2001-07-17 Peter Walker Wet web stability method and apparatus
US7011520B2 (en) 2000-08-04 2006-03-14 Hu-Friedy Mfg. Co., Inc. Two part ultrasonic swivel insert, with one part rotatable relative to the other
US6716028B2 (en) 2000-08-04 2004-04-06 Hu-Friedy Mfg. Co., Inc. Ultrasonic swivel insert
US6811399B2 (en) 2001-07-27 2004-11-02 Hu-Friedy Mfg. Co., Inc. Torque lock for ultrasonic swivelable inserts and method
WO2003051265A1 (en) * 2001-12-14 2003-06-26 Claudio Continolo Dental surgery with equipment
US20070148615A1 (en) * 2005-12-28 2007-06-28 Pond Gary J Ultrasonic endodontic dental irrigator
US8506293B2 (en) * 2005-12-28 2013-08-13 Gary J. Pond Ultrasonic endodontic dental irrigator
US20090166306A1 (en) * 2007-12-31 2009-07-02 Ahearn David J Delivery channel
US20120056066A1 (en) * 2009-05-15 2012-03-08 Habdank Pv-Montagesysteme Gmbh & Co. Kg Support arrangement for solar modules
US8882073B2 (en) * 2009-05-15 2014-11-11 Habdank Pv-Montagesysteme Gmbh & Co. Kg Support arrangement for solar modules
US9456948B1 (en) * 2015-03-06 2016-10-04 Sargon Lazarof Dental chair
US10092473B2 (en) 2015-03-06 2018-10-09 Bio-Dent, Inc. Dental chair
WO2023113857A1 (en) * 2021-12-13 2023-06-22 Canepa Colt Harrison Dental handpiece that has flush capability

Also Published As

Publication number Publication date
ZA721192B (en) 1972-10-25
DE2214248A1 (de) 1972-10-05
GB1390553A (en) 1975-04-16
FR2131520A5 (enrdf_load_stackoverflow) 1972-11-10
BE781022A (fr) 1972-09-22
IT954808B (it) 1973-09-15
NL7203031A (enrdf_load_stackoverflow) 1972-09-26
CA953543A (en) 1974-08-27
BR7201651D0 (pt) 1973-06-14
ES401084A1 (es) 1975-02-16

Similar Documents

Publication Publication Date Title
US3778903A (en) Dental unit
US3718974A (en) Dental handpiece drip control system
US3346957A (en) Dental instrument unit construction
US3143803A (en) Dental lounge unit
US3081542A (en) Mobile dental unit
US3530513A (en) Dental bowl support construction
GB1166665A (en) Dental Equipment Stand
US4042287A (en) Service unit, particularly for a doctor's or a dentist's office
US3280458A (en) Dental equipment stand
US3287552A (en) Remote controlled lighting system
EP0042268A1 (en) A dental apparatus with a number of dental instruments connected to a common control circuit and a common operator unit
US3229368A (en) Dental system
US3259430A (en) Dental apparatus
US3524676A (en) Dental apparatus
US3271859A (en) Dental equipment stand
US4117861A (en) Control and selector unit for dental handpieces
US4249900A (en) Dental console
US4958963A (en) Mobile work station for podiatrist
US3054187A (en) Foot operated speed control units and systems for air driven dental handpieces
US2709546A (en) Automatic water tumbler filling apparatus for dental units
US3691634A (en) Dental unit construction
US3280462A (en) Dental unit
US3653078A (en) Portable dental bowl construction
US2138563A (en) Dental operating unit
US3197868A (en) Dental instrument unit

Legal Events

Date Code Title Description
AS Assignment

Owner name: S.S. WHITE COMPANY, THE,NEW JERSEY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PENNWALT CORPORATION A PA. CORP;REEL/FRAME:004288/0006

Effective date: 19840715

Owner name: S.S. WHITE COMPANY, THE, 100 SOUTH STREET, HOLMDEL

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PENNWALT CORPORATION A PA. CORP;REEL/FRAME:004288/0006

Effective date: 19840715