US3771226A

US3771226A - Water flush cuspidor

Info

Publication number: US3771226A
Application number: US00165617A
Authority: US
Inventors: N Lieb; Caley S Scott
Original assignee: SYNDENT CORP
Current assignee: DEN-TAL-EZ DENTAL PRODUCTS CORP A CORP OF PA; DENTAL-EZ Inc; SYNDENT CORP
Priority date: 1971-07-23
Filing date: 1971-07-23
Publication date: 1973-11-13
Anticipated expiration: 1990-11-13

Abstract

A water flush cuspidor adapted for use with a dental chair that is vertically movable. The water flush cuspidor is mounted on the seat plate by hinged arms. The cuspidor is rotatable from the left side to the right side of the dental chair, rendering the chair usable by both left-handed and right-handed dentists. Additionally, the cuspidor is movable longitudinally relative to the chair. As the chair is raised, the cuspidor will be raised therewith, thereby placing the cuspidor at the proper height for patient use at all times without further adjustment.

Description

United States Patent [1 1 Lieb et al.

[ Nov. 13, 1973 WATER FLUSH CUSPIDOR [75] Inventors: Nathaniel H. Lieb, Narberth;

Samuel Scott Caley, Elverson, both of Pa.

[73] Assignee: Syndent Corporation, West Conshohocken, Pa.

[22] Filed: July 23, 1971 21 Appl. No.2 165,617

[52] U.S. CI. 32/22 [51] Int. Cl.. A6lc 19/02 [58] Field of Search 297/188; 9/263; 32/22 [56] References Cited UNITED STATES PATENTS 3,568,317 3/1971 Braun et al. 32/22 3,530,513 9/1970 Maurer et al. 32/22 ZZZ FOREIGN PATENTS OR APPLICATIONS 1,369,478 7/1964 France 32/22 Primary ExaminerRobert Peshock Attorney-Caesar, Rivise, Bernstein & Cohen [57] ABSTRACT A water flush cuspidor adapted for use with a dental chair that is vertically movable. The water flush cuspidor is mounted on the seat plate by hinged arms. The cuspidor is rotatable from the left side to the right side of the dental chair, rendering the chair usable by both left-handed and right-handed dentists. Additionally, the cuspidor is movable longitudinally relative to the chair. As the chair is raised, the cuspidor will be raised therewith, thereby placing the cuspidor at the proper height for patient use at all times without further adjustment.

10 Claims, 14 Drawing Figures PATENTEDRBV 13 ms 8; 771.226

SHEET 10F 8 M/VE/Vfflfif. NATHANIEL H. LIEB SAMUEL SCOTT CALEY ATTORNEYS,

PATENTEDHBV 13 ms 3771.226 SH'LET 3 CF 8 M/VEA/TOKS. NATHANIEL H. uEB SAMUEL SCOTT CALEY Garza/0 68M, W8 0M PATENIEDHuv '13 1915 SHEET 0F 8 wry/mm NATHANIEL H. LIEB SAMUEL SCOTT CALEY ArraP/an,

PATENTEDNOYIB I973 3,771,226

sum 5 OF 8 own 7M5. NATHANIEL H LIEB SAMUEL SCOTT CALEY A TIDE/V5 Y PATENIEDRBY13 m5 3; 771; 226 SHEET 6 GF 8 NATHANIEL H. LlEB 8 SAMUEL SCOTT CALEY A ram/E yx.

PAIENTEDHUV '13 I975 HIGH SPEED EVACUATOR SALIVA EJECTOR SYRINGE SHEET 7 BF 8 isouos COLLECTOR VACUUM MANIFOLD VACUUM PUME QUICK by DISCONNECT E3794 VACUUM LINE 2Z0 CUSPIDOR WASH VACUUM AND WATER VALVES OPERATED CUP gFlLL SHAFT VA LVE HEATER AIR FROM FILT. REG.

WATER FROM FIL'I'. REG.

NATHANiEL SAMU EL SCOTT CALEY 8) 2 "coaw Arm/ME YS,

PAIENIEDNHY 13 I975 3; 771.226 SHEET 8 CF 8 souos COLLECTOR HIGH SPEED EvAcuAToR 203 94 W b7 4 228 CUSPIDOR CUP SALWA VACUUM WASH FILL EJECTOR MANIFOLD E M8 VACUUM PUMP v54 SYRINGE X330 QUICK DISCONNEC as T NATURAL 1 DRAW OPSSIQE'FED J VALVE 79a HEATER faZ T x202 1 via 200 X519 AIR FROM wATER FROM FILT. REG. FlLT. REG.

//VV/V7fi/?S.

NATHANIEL H. LIEB VSAMUE'L SCOTT CALEY ATTMWEYI,

WATER FLUSH CUSPIDOR This invention relates to a water flush cuspidor, and more particularly, to a water flush cuspidor that. is particularly adapted for use on dentists chairs.

Typically, dentists offices are provided with chairs that are vertically adjustable and with consoles which house the dentists tools and the water flush cuspidor for the patient. The cuspidor is rigidly mounted with respect to the chair, and cannot be moved to accommodate varying sized patients. Frequently, therefore, a great deal of time is lost when the dentist is treating the patient because of the time necessary to allow the patient to use the cuspidor in order to empty his mouth. Additionally, because of the fixed location of the cuspidor, a given chair can only be used by either a righthanded dentist or a left-handed dentist, but not both, since the cuspidor will interfere with dentists use of the chair on the side of the chair where the cuspidor is located.

An apparatus which has overcome the bulk of the problems of the fixed cuspidor is disclosed in U.S. Pat. No. 3,524,676. This patent discloses a water flush cuspidor that is mounted on a ring supported at the base of the dental chair. The cuspidor can be rotated to either side of the chair, thereby rendering the same useful with both left-handed and right-handed dentists. Additionally, the cuspidor is adjustable in height, and accordingly, can be used with varying sized patients.

The device of this invention includes all of the advantages of the device disclosed in U.S. Pat. No. 3,524,676, and in addition, possesses a number of additional advantages of its own. The device of this invention is rotatable around the chair, and accordingly can be used either by left-handed or right-handed dentists. This feature is particularly useful in dental clinics, such as those at dental schools, where a number of different dentists or oral hygienists will be using the same chair. Thus, the chair can readily be used by any. of the students in the school, and it will not be necessary to provide left-hand chairs and right-hand chairs. for the students.

One of the novel features of the device of this invention is the fact that the cuspidor will rise or be lowered along with the rising or lowering of the chair. Thus, it will not be necessary to reposition the cuspidor after the chair has been raised. In this device in U.S. Pat. No. 3,524,676, the mounting of the cuspidor is independent of the raising and lowering of the chair. Accordingly, the device must be readjusted each time the chair is raised or lowered. I

Another feature of the device of this invention is the fact that the cuspidor is readily moved forward or backward, that is, along the longitudinal axis of the chair, to accommodate the size of the patient. This cannot be readily accomplished with the device disclosed in U.S. Pat. No. 3,524,676.

Another advantage of the device of this invention over that disclosed in U.S. Pat. No. 3,524,676 is that the chair movement will not affect the cuspidor. Thus, in the prior device, unless the cuspidor has been moved out of the way with respect to the chair, the chair can damage the unit when it is raised or lowered. In the device of this invention, the raising or lowering of the chair will automatically raise or lower the cuspidor, and no damage can result to the cuspidor from this movement.

It is accordingly an object of this invention to provide a novel water flush cuspidor.

It is another object of this invention to provide a novel water flush cuspidor that is adapted for mounting on a dental chair, and which will rise or be lowered along with the raising or lowering of the dental chair.

These and other objects of the invention are accomplished by providing a water flush cuspidor comprising a bowl, a support assembly for the bowl, said support assembly being adapted to be rotatably mounted on the seat plate of a dental chair, whereby the raising or lowering of the chair will raise or lower the support assembly, said support assembly including hinge means for varying the horizontal location of said bowl.

Other objects and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:

FIG. 1 is a perspective view of the water flush cuspidor assembly of this invention, with a dental chair shown in phantom;

FIG. 2 is a top plan view of the device of FIG. 1, and showing the two positions for the device on opposite sides of the dental chair;

FIG. 3 is an elevational view taken in the direction of line 33 of FIG. 2, with portions broken away for the purpose of clarity;

FIG. 4 is a top plan view of the attachment of the support assembly to the dental chair, and is taken in the direction of line 4-4 of FIG. 3;

FIG. 5 is a sectional view taken along the line 5-5 of FIG. 3;

FIG. 6 is an enlarged sectional view taken along the line 6-6 of FIG. 3;

FIG. 7 is an enlarged sectional view taken in the area 7 of FIG. 3',

FIG. 8 is a sectional view taken along the line 8-8 of FIG. 7;

FIG. 9 is an enlarged sectional view taken along the line 9-9 of FIG. 3; I

FIG. 10 is a perspective view of the water flush cuspidor;

FIG. 11 is a sectional view taken along the line 11-11 of FIG. 10;

FIG. 12 is an exploded diagrammatic fragmentary perspective view showing the plumbing and electrical components enclosed in the cuspidor housing;

FIG. 13 is a piping diagram for the vacuum operated cuspidor; and

FIG. 14 is a piping diagram for the natural drain cuspidor.

Referring now in greater detail to the various figures of the drawings wherein like reference characters refer to like parts, a water flush cuspidor unit embodying the present invention is generally shown at 20 in FIG. 1. Device 20 basically comprises a cuspidor 22 and a support assembly 24.

The device of this invention is adapted to be mounted on any dental chair. It is particularly useful on dental chairs that can be raised or lowered, which is a property of substantially every dental chair now in use. By way of example, a dental chair has been shown in phantom at 26 in FIG. 1. Chair 26 includes the usual elements of the dental chairs currently in use, such as a base 28, a seat raising assembly 30 which is housed in an accordion pleated sleeve 32, a seat plate 34 and a seat 36. The chair also includes pedals, such as those shown at 38, for raising and lowering the seat and for tilting the seat. The vertical reciprocation of the seat is indicated by arrows 40 in FIG. 1.

The support assembly 24 for the device of this invention is secured to chair 26 through the use of a bar 42 (FIG. 1) that is bolted to seat plate 34. Bar 42 includes a vertical plate 44 at the end thereof. As seen in FIGS. 1 and 4, a mounting plate 46 is secured on plate 44 through the use of bolts 48 and associated nuts. A pair of spaced flanges 50 projects horizontally outward from the front face of plate 46 (FIGS. 1 and 3). Arm 52 of support assembly 24 includes a pair of plates 54 that are pivotally mounted in flanges 50 by pins 56.

As seen in FIG. 7, arm 52 is hollow, and includes a pair of horizontal plates 56 at one end thereof. A second arm 60 includes a pair of plate extensions 62 which overlie plates 58. Upper plate 62 includes a downwardly projecting pin 64 that is received in an opening in the upper plate 58. A washer 66 separates the two plates.

A bolt 68 passes through a pair of aligned holes in the lower plate 62 and the lower plate 58. A washer 70 is telescoped over bolt 68 and positioned between the plates. A nut 72 secures the bolt in place.

As seen in FIG. 1, arm 60 includes an upwardly inclined extension 74. Cuspidor 22 is mounted on the top of extension 74. As further seen in FIG. 1, arm 52 is held in its horizontal position through flanges 50 and their associated pins. Likewise, arm 60 is maintained in a horizontal plane through

plates

62 and 58 and pin 64 and bolt 68. The extension 74 in turn maintains the cuspidor 22 in its horizontal position.

As chair 26 is raised, seat plate 34 will be raised therewith. This in turn will cause the raising of

arms

52 and 60 and the cuspidor 22. Likewise, as the seat is lowered, the arms and the cuspidor will also be lowered. The vertical reciprocation of the support assembly 24 and the cuspidor 22 are indicated by arrows 76 and 78, respectively, in FIG. 1. Additionally, as seen in FIG. 2, the support assembly 24 and cuspidor 22 are swingable about chair 26 from the position shown in full line on one side of the chair to the position shown in phantom at 24 and 22', respectively, on the other side of the chair.

Referring to FIG. 2, it is seen that arms 52 are rotatable about pins 56 from any position on one side of the chair, which is shown in full line, to any position on the other side of the chair, which is shown in phantom at 52'. The are of rotation of arm 52 is indicated by

arrows

80 and 80. Likewise, arm 60 is rotatable about arm 52 through pin 64 and bolt 68. This arc of rotation is indicated by arrows 82 in FIG. 2. It should also be noted in FIG. 2 that cuspidor 22 is completely horizontally adjustable on either side of chair 26. Thus, the cuspidor can be moved fore and aft, that is, longitudinally along the side of the chair, and in addition, can be moved toward and away from the patient. This is accomplished through the use of the dual pivot points at both ends of arm 52. Thus, the cuspidor is substantially universally adjustable in it horizontal plane.

Referring to FIG. 1, it is seen that a control box 84 is provided for the cuspidor 22. A flexible conduit 86 emanates from control box 84 and enters arm 52. The flexible conduit houses all of the various lines used in the operation of the cuspidor 22. Thus, it will contain a drain line, when the cuspidor is used with the natural drain, an electrical line, a water supply line, an air supply line and a vacuum drain line. All of these lines are connected in box 84 with permanent lines within the dentists office or within the clinic. Insofar as the vacuum line is concerned, it will be connected to the vacuum source in box 84.

Box 84 also includes 24 volt transformer for the electrical line. A rod 88 (FIG. 1) passes through box 84, and is movable horizontally therein. This rod is used for opening or closing all lines that are connected in the box. A pilot light 90 indicates whether the various lines are opened or closed.

Referring to FIG. 3, it is seen that flexible conduit 86 is secured on a sleeve 92 which projects downwardly from bottom flange 50. The sleeve is hollow, and the various lines within conduit 86 pass into arm 52. Referring to FIG. 9, it is seen that arm 52 is basically rectangular in cross section, and is hollow. The various lines leading to cuspidor 22 are shown therein. These lines include a vacuum line 94, an electrical line 96, a water line 98 and an air line 100. In addition, as will be explained hereinafter, the cuspidor 22 can be operated either on a natural drain or on a vacuum drain. When it is used on a natural drain, a drain line 102 is included.

Arm 60 and its extension 74 are also hollow, and have the same cross section as arm 52. All of the lines passing through arm 52 pass through arm 60 and up into extension 74, where they are eventually connected to the various components within cuspidor 22, as will be explained hereinafter. Since the various lines are flexible, they will readily adapt to any position of the hinges formed at the ends of arm 52.

The cuspidor is shown in detail in FIGS. 10 and 11.

The cuspidor basically comprises a base plate 104 having an upstanding wall 106 and a cover plate 108 having a dependent wall 110. Cover plate 108 includes a circular opening having a down-turned lip 112 therein. Bowl 14 of the cuspidor is positioned within the opening, and a gasket 116 holds the bowl in a watertight condition within cover plate 108. A faucet 118 is provided for filling a cup that is positioned in recess 120 of the cover plate. A push button 122 is used for opening the faucet 118.

Bowl 114 includes a tubular drain 124 at the center thereof. A coiled compression spring 126 is telescoped around drain 124, and bears against the bottom of bowl 114 and against the top of base plate 104. Spring 126 holds the top of bowl 114 in sealing engagement with gasket 116. The cover plate 108 is releasably secured on base plate 104 by any of the conventional means known to the art, such as a snap fit of the cover plate over a resilient plate projecting upwardly from the base plate. Other means, such as nuts, bolts and linking plates can also be used. A drain pipe 128 is telescoped over drain 1240f bowl 114. An O-ring 130 provides a liquid type connection between drain 124 and pipe 130. Pipe 130 includes an L-extension 132.

Water for bowl 114 enters through a pipe 134, and then through a block 136 mounted on the interior of the bowl. A spigot 138 is positioned at the top of block 136 and is pointed downwardly into the bowl. A removable solids collector or strainer 140 is positioned in drain 124 of bowl 114.

An instrument plate 142 is suspended from the bottom of base plate 104 by bars 144. A plurality of notches 146 is formed in instrument plate 142. The purpose of notches 146 is to support various dental instruments that are associated with the cuspidor, such as serve the function of handgrips for moving cuspidor 22 to its desired position.

Referring to FIG. 5, it is seen that the various lines associated with the support assembly 24 pass through extension 74 into an opening 154 in base plate 104. Extension 74 supports the cuspidor 22 through the use of brackets 156 which are mounted on the base plate 104.

The various lines passing through opening 154 are shown in detail in FIG. 12. Thus, water line 98 passes into a water filter and regulator 158. From the regulator, a first exit line 160 is provided. Line 160 is coupled with a line 162 through which the water passes to a water heater 164. A thermostat 166 is associated with the water heater. Current for the water heater is provided through electrical line 96. The water heater additionally includes a switch 168 and a pilot light 170.

Heated water leaves heater 164 through line 172. The water passing through line 172 is connected to syringe 154. The syringe 154 can be any of the types known to the art, but in the embodiment shown, is a three-way syringe. Thus, it can be used to spray air, water or a combination of air and water.

A second line 174 leaves heater 164 and entersa block 176. A first line 178 leaving block 176 supplies the water for faucet 118. The flow of water from the faucet is controlled by push button 122, which is a part of a valve mechanism. I

A second line 180 leaves block 176. This line is controlled through a valve 182 having an upwardly projecting shaft 184 for opening and closing the valve. Water passing through line 180 is projected into bowl 114 through spigot 138. A manually operated valve 186 is used to control the rate of flow through spigot 138. The supply to block 176 for water line 180 is through line 188 which is connected to line 160.

The

water supply lines

180 and 188 described above are used when the bowl 144 is used in connection with a vacuum drain, as will be explained hereinafter. When there is no vacuum drain, and a natural drain is used, the water supply to bowl 144 is continually operated, and there is no intermittent operation through the use of valve 182. In this case, line 188 and the first portion of line 180 are eliminated, and a line 190 connects line 160 with the latter half of line 180. When line 190 is used, water is continually fed to bowl 1 14, unless valve 186 is closed. Thus, the valve 186 not only controls the rate of flow of the water to the bowl, but also is used to stop all water flow to the bowl. It should also be noted that when line 190 is used, line 188 and the first portion of line 180 are eliminated. Likewise, when line 188 and the first portion of line 180 are used, line 190 is eliminated.

Another water line 192 emanates from water filter and regulator 158. Water passing through line 192 is used with a hydrocolloid. The hydrocolloid is a conventional device which furnishes chilled water to hardened wax impressions taken in the mouth of the patient. The chilled water for the hydrocolloid can be supplied at the water source for water line 98.

Line 192 terminates in a quick-disconnect 194. The hydrocolloid has its inlet line connected to quickdisconnect 194 and its outlet line connected to quick disconnect 196. The quick-disconnects are well known to the art and in and of themselves, form no part of this invention. The outlet water from the hydrocolloid passes through line 198, which is in turn connected to the vacuum manifold or natural drain, depending on the drain system being used.

The incoming air, which enters through air line 100, passes through a filter 200. It leaves filter 200 through line 202 which connects the air supply with syringe 150.

Vacuum line 94 passes through opening 154 in base plate 104. The vacuum line is connected within the cuspidor to a solids collector 204. A line 206 connects the high speed evacuator 152 with the solids collector 204. A line 208 connects the saliva ejector 148 with the solids collector 204. Thus, any solids removed by the saliva ejector or high speed evacuator are removed by solids collector 204 before the liquid and air passing through the line are transmitted to vacuum line 94.

When the cuspidor 22 is vacuum controlled, actuation for the vacuum system is through the use of bar 210. Bar 210 is positioned on a bracket 212 which is in turn pivotally mounted on the cuspidor housing, as by pins 214 (one shown in FIG. 12). Bracket 212 has a hole formed in one leg thereof, and one leg of a U- shaped rod 216 is received in the hole. The lower leg of rod 216 is received in a hole in shaft 218 of a valve 220.

In using the cuspidor 22 with a vacuum drain, a line 222 is coupled to L-extension 132 (FIG. 11) of drain pipe 128. Line 222 is connected to valve 220, and a line 224 emanates from the valve. Line 224 passes to a vacuum manifold, which is in turn connected with vacuum drain line 94.

When the cuspidor 22 is used in a natural drain system,

lines

222 and 224 and valve 220 are eliminated. Likewise, bar 210 and its associated bracket 212 are also eliminated. The bracket 212 includes a flange 226 which is used for flushing the bowl 114 when the vac-. uum drain is used. This flange can also be eliminated. Accordingly, when the bowl 114 is connected with the natural .drain, drain pipe 102 is connected to L- extension 132 (FIG. 11) of drain 128. The material leaving the bowl will flow, by gravity, through the bowl, through drain 1 28 and out through line 102.

A piping diagram for the vacuum operated system is v shown in FIG. 13. The operation of the vacuum system can be seen through the use of FIGS. 12 and 13. When using the vacuum system, any material placed in bowl 114 is not withdrawn from the system until the vacuum is actuated. Thus, if the patient should expectorate the contents of his mouth, as when rinsing, into the bowl 1 14, the solids will be retained by strainer 140, and the liquids will pass into drain 128 (FIG. 11). Periodically, the system will have to be flushed. The flushing of the system is accomplished by depressing bar 210.

When the bar 210 is depressed, bracket 212 will be pivoted, thereby raising U-shaped rod 216. This in turn raises valve shaft 218, thereby opening valve 220. Any materials that are in drain 128 pass through line 222, valve 220 and line 224 into vacuum manifold 228 (FIG. 13). From the vacuum manifold, the drain materials are evacuated from the system through line 94 by vacuum pump 230 (FIG. 13).

At the same time the vacuum system is actuated, a water spray passes into bowl 114 through spigot 138 in order to clean the bowl. The actuation for the water spray is through bar 210. Accordingly, the vacuum system and the water spray are actuated simultaneously. When the bar 210 is depressed, flange 226 will also be depressed, thereby depressing shaft 184 of valve 182. This permits water to flow through line 180 into the bowl 114.

It is thus seen that no water enters bowl 114 except when bar 210 is depressed. This also actuates the vacuum system at the same time as pointed out above.

The other lines used in the vacuum system are shown in FIG. 13. These other lines are common to both the vacuum system and the natural drain system, and operate independently of the vacuum system. Thus, water and air are continually supplied to syringe 150, and the vacuum line 94 used in connection with the high speed evacuator 152 and saliva ejector 148 is always in operation. Likewise, there is a continuous supply of water to valve 122 through line 174. Solids collector 204 removes any solids brought into the system through the high speed evacuator or saliva ejector. Strainer 140 removes any solids that are placed in the bowl 114.

It should also be noted in FIG. 13 that the

hydrocolloid lines

192 and 198 also operate independently of the vacuum drain for the bowl 114. The hydrocolloid lines are connected directly to the vacuum manifold, and are independent of the

valves

182 and 220 used in connection with the vacuum drain.

FIG. 14 is a piping diagram for the cuspidor when used with a natural drain. A comparison of FIG. 13 to FIG. 14 shows that many of the lines are identical in both systems. Thus, the water and air lines are identical for the syringe 150, and the lines for the high speed evacuator 152 and saliva ejector 148 are identical in both systems. In the natural drain system, however, the vacuum line to the cuspidor is eliminated, along with its valve. The intermittant valved system for regulating the water supply to the bowl 114 is eliminated, and the actuating bar 110 is eliminated.

In the natural drain system, the water supply to the bowl 114 is constantly flowing through line 190, and the water volume is regulated by valve 186. The cuspidor is continuously drained through line 102 which terminates in a natural drain 232. Likewise, the drain line 198 for the hydrocolloid is connected to drain line 102,

and thus is placed on a natural drain system.

It should be noted that even when the bowl 114 is on a natural drain system, the vacuum line 194 is still used in connection with the high speed evacuator and saliva ejector. However, when the cuspidor is vacuum operated, the natural drain line 102 is eliminated entirely.

The cuspidor of this system is readily adapted for use with either a vacuum drain or a natural drain. The assembly of the cuspidor for either type of system is readily accomplished, and the major portion of the lines going to and emanating from the cuspidor is common to both types of systems. Regardless of the type of system used, the support assembly 24 for the cuspidor need not be modified, with the exception of the fact that natural drain line 102 can be eliminated when the vacuum drain is used.

The cuspidor of this invention is adapted for use with any of the elements generally used by a dentist in the treatment of his patients. By way of example, the high speed evacuator, saliva ejector and syringe have been shown, since these three elements are best adapted for use with the cuspidor. The cuspidor has a selfcontained heater and a water supply for rinse water. There is also a water supply for rinsing the bowl 114.

One unique feature of the cuspidor is the fact that it will be raised and lowered as the patients chair is raised and lowered, and can be moved to substantially any horizontal position on either side of the chair, thereby rendering it effective for use by either a lefthanded or right-handed dentist. Additionally, because of the complete mobility of the cuspidor, it is particularly adapted for use in four handed dentistry. Thus, treatment of a patients mouth may be carried out by either two dentists or by a dentist and his assistant, such as a oral hygienist.

Since the cuspidor will rise along with the raising of the chair, there is no danger of the chairs hitting the cuspidor when it is raised. In the aforementioned US. Pat. No. 3,524,676, it is possible for the chair to hit and damage the cuspidor when the chair is raised, since the movement of the cuspidor is completely independent of the raising and lowering of the chair. In the device of this invention, the vertical position of the cuspidor need not be adjusted as the chair is raised or lowered.

Without further elaboration, the foregoing will so fully illustrate our invention that others may, by applying current or future knowledge, readily adapt the same for use under various conditions of service.

What is claimed as the invention is:

1. A water flush cuspidor assembly comprising a cuspidor and a support assembly for said cuspidor, said support assembly being adapted to be rotatably mounted on the seat plate of a dental chair, whereby the raising or lowering of the chair will raise or lower the support assembly, said support assembly comprising a first arm and a second arm, said first arm being rotatably secured at one end to means for mounting said support assembly on said seat plate, said first arm being rotatably secured to said second arm at its other end, said first arm being rotatable around a vertical axis at said mounting means, said second arm being rotatable around a vertical axis with respect to said first arm,said arms, -in combination, having a horizontal dimension and a vertical dimension, said horizontal dimension being sufficiently great to permit the water flush cuspidor assembly to be rotated from the left side to the right side of the dental chair without any interference from the chair, and said vertical dimension being sufficiently great to position the cuspidor at a convenient height fora patient sitting in the chair, whereby said support assembly can be pivotally moved to vary the horizontal location of said cuspidor.

2. The water flush cuspidor assembly of claim 1 and further including a water line passing through said arms and to said cuspidor.

3. The water flush cuspidor assembly of claim 1 wherein said second arm includes an upwardly inclined extension, said cuspidor being secured on said extens1on.

4. The water flush cuspidor assembly of claim 1 wherein said arms are hollow, said support assembly further including a water line and a vacuum line passing through said arms and to said cuspidor.

5. The water flush cuspidor assembly of claim 4 and further including an electrical line passing through said arms and to said cuspidor, said electrical line being connected to a water heater in said cuspidor.

6. The water flush cuspidor assembly of claim 4 and further including an air line passing through said arms and to said cuspidor, said air line being connected to a syringe held by said cuspidor.

7. The water flush cuspidor assembly of claim 4 and further including a drain line passing through said arms and to said cuspidor, said drain line being connected to the drain of a bowl in said cuspidor.

8. The water flush cuspidor assembly of claim 1 wherein said cuspidor comprises a base plate and a cover plate, a bowl positioned in said cover plate to accept material expectorated by a patient, a support arm mounted on said base plate, said support arm including a bar spaced from said base plate, said bar having notches therein for securement of dental equipment.

9. The water flush cuspidor assembly of claim 8 wherein one of said notches contains a saliva ejector, another of said notches contains a high speed evacuator and a third of said notches contains a syringe, with the air, vacuum and water supplies for the dental equipment passing through said support assembly and to said cuspidor.

10. The water flush cuspidor assembly of claim 1 wherein said cuspidor comprises a base plate and a cover plate, said cover plate having a bowl formed therein for reception of the material expectorated by a patient, means for supplying rinse water to said bowl, and a faucet mounted on said cuspidor, said faucet being adapted to furnish rinse water for a patient, with the water supply for said cuspidor passing through said support assembly.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent NOJ 5,77 Dated Nov. 15, 1975 Inventor) Nathaniel H. Lieb et al.

It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the Title Page, the name of the Assignee in item ['73] "Syndent Corporation" should read Star Dental Manufacturing Co. Inc.

Signed and sealed this 1st rlay of April 1375.

32:11,) Attest:

C. MARSHALL DANE? RUTH C. EMSION Commissioner of Patents Attesting Officer and Trademarks FORM PC9-1050 (10-69) USCOMM-DC 60376-1 69 u.s. GOVERNMENT rnm'rmc OFFICE: 93o

Claims

1. A water flush cuspidor assembly comprising a cuspidor and a support assembly for said cuspidor, said support assembly being adapted to be rotatably mounted on the seat plate of a dental chair, whereby the raising or lowering of the chair will raise or lower the support assembly, said support assembly comprising a first arm and a second arm, said first arm being rotatably secured at one end to means for mounting said support assembly on said seat plate, said first arm being rotatably secured to said second arm at its other end, said first arm being rotatable around a vertical axis at said mounting means, said second arm being rotatable around a vertical axis with respect to said first arm,said arms, in combination, having a horizontal dimension and a vertical dimension, said horizontal dimension being sufficiently great to permit the water flush cuspidor assembly to be rotated from the left side to the right side of the dental chair without any interference from the chair, and said vertical dimension being sufficiently great to position the cuspidor at a convenient height for a patient sitting in the chair, whereby said support assembly can be pivotally moved to vary the horizontal location of said cuspidor.

3. The water flush cuspidor assembly of claim 1 wherein said second arm includes an upwardly inclined extension, said cuspidor being secured on said extension.