U.S. patent number 3,718,974 [Application Number 05/181,671] was granted by the patent office on 1973-03-06 for dental handpiece drip control system.
This patent grant is currently assigned to The Weber Dental Manufacturing Company. Invention is credited to Dean H. Buchtel, Kenneth R. Lappin, John A. Maurer.
United States Patent |
3,718,974 |
Buchtel , et al. |
March 6, 1973 |
DENTAL HANDPIECE DRIP CONTROL SYSTEM
Abstract
A control system for exhausting coolant water which is trapped
within a dental handpiece coolant water supply line upon
deactuation of the handpiece to eliminate drip at the handpiece.
Compressed air which actuates a coolant water supply valve is
exhausted into a branch line upon closing of the supply valve. The
exhaust air opens a valve positioned between the water coolant line
and drain facilities. The trapped coolant water flows into the
drain through the open exhaust valve reducing the trapped water and
pressure in the coolant water supply line. The exhaust air is
relieved slowly through a choke after opening the exhaust valve,
permitting the exhaust valve to close slowly enabling a sufficient
quantity of trapped water to be exhausted.
Inventors: |
Buchtel; Dean H. (Canton,
OH), Lappin; Kenneth R. (Canton, OH), Maurer; John A.
(Canton, OH) |
Assignee: |
The Weber Dental Manufacturing
Company (Canton, OH)
|
Family
ID: |
22665276 |
Appl.
No.: |
05/181,671 |
Filed: |
September 20, 1971 |
Current U.S.
Class: |
433/27 |
Current CPC
Class: |
A61C
1/0007 (20130101) |
Current International
Class: |
A61C
1/00 (20060101); A61c 019/02 () |
Field of
Search: |
;32/22,23,26,27
;251/113 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Peshock; Robert
Claims
We claim:
1. A dental handpiece drip control system including a dental
handpiece, a water supply, a water pipeline connecting the water
supply with the handpiece, first water control valve means in said
water pipeline located between said water supply and said dental
handpiece, means for actuating said first valve means, a junction
in the water pipeline between said first valve means and said
dental handpiece, drain means, a drain pipeline connecting the
water pipeline at the junction with the drain means, second valve
means in said drain pipeline located between the junction and the
drain means, and means for actuating said second valve means, said
first and second valve means being operatively interconnected
whereby operation of said first valve means stopping flow of water
from the water supply to the handpiece actuates said second valve
means exhausting water trapped in the water pipeline between the
handpiece and the first valve means through the second valve means
into the drain means through the drain pipeline.
2. The system defined in claim 1 in which the actuating means for
the first valve means includes a supply of compressed air, in which
an air supply pipeline connects the supply of compressed air with
the first valve means; and in which means are positioned in the air
supply pipeline for controlling the flow of compressed air in said
pipeline for actuating said first valve means between open and
closed position.
3. The system defined in claim 2 in which the actuating means for
the second valve means includes an air exhaust pipeline, in which
said air exhaust pipeline connects with the air supply pipeline and
said second valve means, and in which the flow of compressed air
trapped in the air supply pipeline when the first valve means is in
closed position actuates the second valve means to open position
through said air exhaust pipeline.
4. The system defined in claim 3 in which check valve means is
connected in the air exhaust line between the first and second
valve means to trap exhaust air between the second valve means and
the check valve means.
5. The system defined in claim 4 in which choke means is connected
with the air exhaust line between the second valve means and the
check valve means.
6. The system defined in claim 1 in which water heater means is
connected in the water pipeline between the first valve means and
the main water supply.
7. The system defined in claim 1 in which a selector valve block
means is connected in the water pipeline between the junction and
the handpiece, in which a plurality of branch water coolant lines
extend from the valve block means, and in which control means
connect with said valve block means for selectively connecting the
supply of water with dental handpieces connected to each of the
branch lines.
8. Dental handpiece drip control system including a dental
handpiece, a water supply, a water pipeline connecting the water
supply with the handpiece, first water control valve means in said
water pipeline located between the water supply and the dental
handpiece, a junction in the water pipeline between the first valve
means and the dental handpiece, drain means, a water exhaust line
connecting the drain means with the junction, second valve means in
the water exhaust line between the drain means and the junction,
actuating means for said first and second valve means including a
supply of compressed air, a compressed air supply line connects the
compressed air supply with the first valve means, control means in
said compressed air supply line between the first valve means and
the compressed air supply, and an air exhaust line connecting the
control means and the second valve means whereby the compressed air
trapped in the compressed air supply line between the first valve
means and the control means when the first valve means is closed
exhausts into the exhaust air line through the control means and
opens the second valve means to enable the water trapped between
the handpiece and the first valve means to flow through the second
valve means from the junction into the drain means through the
water exhaust line.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to dental handpieces used by a dentist in
performing dental work. More particularly the invention relates to
a drip control system for exhausting excess pressure and water
trapped in lines connected to the handpiece which supply cooling
water to the handpieces during cutting and drilling operations,
preventing such coolant water from dripping at the handpieces when
the handpiece is not in use.
1. Description of the Prior Art
Dental handpieces are one of the most important tools used by a
dentist in performing dental work, such as for high or low speed
cutting or drilling operations. The handpieces require a supply of
air or water, or a combination of air and water for either driving
power, cooling purposes, or both.
The flow of water to such handpieces usually is control-led by a
foot pedal mounted on the floor adjacent a dental chair. The pedal
when actuated by the dentist's foot, operates water and/or air
actuated valves positioned within a dental console or tray assembly
to admit a supply of coolant water through a supply line into the
handpiece.
Problems arise in the use of such handpieces, in that after closing
the control valves to stop the flow of coolant water to the
handpiece, the water trapped in the supply line between the
handpiece and closed valve drips from the water spray opening or
other opening in the handpiece.
Although the amount of water drippage is mall, it is an
inconvenience to the dentist and patient, especially when the
handpiece is started and stopped several times during a drilling or
cutting operation. Likewise, use of the handpiece throughout the
day results in considerable drippage onto the handpiece storage
rack, floor and the like.
The valve controlling the flow of coolant water to the handpiece
preferably is located within the dental cabinet with the various
piping, valves and other control apparatus to provide an attractive
dental unit. The handpiece usually is attached at one end of a
flexible tube sufficiently long to permit easy movement of the
handpiece by the dentist, and therefore some distance from the
water coolant control valve.
Thus, when the control valve is closed, the trapped water in the
isolated section of line is forced through any opening in the
handpiece since the water is under pressure and such pressure is
still acting on the trapped water.
These situations have presented problems in the art and we are
unaware of any drip control system which eliminates such handpiece
water drippage in a simple and effective manner.
SUMMARY OF THE INVENTION
Objectives of the invention include providing a dental handpiece
drip control system incorporated into the piping connections and
supply line components within a dental console or cabinet which
prevents the coolant water trapped within the handpiece supply line
from dripping from the handpiece after closing the supply line
control valves; providing a dental handpiece drip control system
which exhausts trapped coolant water in the handpiece supply line
into a dental unit drain line and which permits the coolant water
control valve to be concealed within the dental cabinet removed
from the handpiece to present an attractive dental unit; providing
a dental handpiece drip control system which uses the same air for
actuating the water exhaust valve as is used for actuating the
coolant water supply valve; providing a dental handpiece drip
control system which is quiet in operation; and providing a dental
handpiece drip control system which satisfies the stated objectives
using usual components of simple and inexpensive design, and which
avoid difficulties heretofore encountered in a simple, effective,
and inexpensive manner, and which solve problems and satisfy
existing needs in the art.
These objectives and advantages are obtained by the dental
handpiece drip control system, the general nature of which may be
stated as including a main water supply, a dental handpiece, a
water pipeline connecting the supply with the handpiece, first
water control valve means in the water pipeline between the water
supply and the handpiece, means for actuating the first control
valve means, a junction in the water pipeline between the first
valve means and the handpiece, second valve means connected with
the junction, drain means connected with the second valve means,
the first and second valve means being operatively interconnected
whereby operation of the first valve means stopping the flow of
water from the water supply to the handpiece opens the second valve
means exhausting water trapped in the water pipeline between the
handpiece and the first valve means through the second valve means
into the drain means; the actuating means for the first valve means
including a supply of compressed air, an air supply pipeline
connecting the supply of compressed air with the first valve means,
means in the air supply pipeline for controlling the flow of
compressed air in the pipeline for operating the first valve means,
an air exhaust pipeline connected with the supply air pipeline and
second valve means through the compressed air control means whereby
upon shutting off the flow of compressed air into the air supply
line by the control means, the compressed air trapped in the air
supply line exhausts into the air exhaust pipeline through the
control means and actuates the second valve means; check valve
means in either the air supply pipeline or air exhaust pipeline to
trap exhaust air between the second valve means and the check valve
means, choke means in the air exhaust pipeline, water heater means
in the water pipeline between the first valve means and the main
water supply, and a selector valve block means in the water
pipeline between the junction and the handpiece whereby a plurality
of handpieces may be connected to the selector valve block means
and controlled by the first and second valve means.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention -- illustrative of the best
mode in which applicants have contemplated applying the principles
-- is set forth in the following description and shown in the
drawings and is particularly and distinctly pointed out and set
forth in the appended claims.
FIG. 1 is a perspective view of a dental cabinet or unit in which
the handpiece drip control system and components may be housed for
usual handpieces shown supported by a tray arm mounted on the
cabinet;
FIG. 2 is a diagrammatic view illustrating piping connections,
components and control lines provided for the handpiece drip
control system;
FIG. 3 is an enlarged fragmentary view, with portions broken away
and in section, of a foot controller for controlling the supply of
coolant water to the handpieces; and
FIG. 4 is an enlarged sectional view of an air actuated water
control valve used in the drip control system.
Similar numerals refer to similar parts throughout the
drawings.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The invention is shown typically in the drawings and is
incorporated in the illustrated dental cabinet or unit 1 (FIG. 1).
The cabinet 1 may have any desired size or type of construction,
may house other dental appliances or accessories, may be mounted on
a wall or on a floor, and may have suitable plumbing connections
for a main water supply and drain or waste facilities.
Cabinet 1 is located conveniently to a dental chair to be readily
accessible to the dentist or his assistant and may be of the type
described in our copending application, Ser. No. 155,659, filed
June 16, 1971.
A usual pivoted tray arm 2 may be mounted on and extend outward
from the top of cabinet 1 and includes a support platform 3 having
a tray 4, recess mounted thereon. A number of manual handpieces 5
may be removably supported on either side of platform 3 as
illustrated, or may be housed within cabinet 1.
A foot controller 6, for operating desired dental equipment
accessories including handpieces 5, is located on the floor
adjacent cabinet 1 and a dental chair. Controller 6 may be
connected through a flexible conduit 7 with a junction box 8, and
electrical power and air lines may pass through conduit 7 between
foot controller 6 and junction box 8.
Another flexible conduit 9 extends between junction box 8 and
cabinet 1, and air, electric power, water and drain lines may pass
through conduit 9 between junction box 8 and cabinet 1.
A main water supply pipe 10 (FIG. 2) for supplying water for the
handpieces and for accessories with which the dental unit 1 may be
equipped may extend through a partition support member 11, and is
supported thereon by flange 12. Support member 11 is mounted in any
suitable manner within cabinet 1 near the bottom thereof. Another
support member 13 also may be mounted within cabinet 1 spaced above
member 11 and near the top of cabinet 1.
Water in main supply pipe 10 then flows through pipe section 14 to
manual water shutoff valve 15. Valve 15 preferably is provided so
as to permit repairs to any water lines beyond valve 15 and also to
provide a cutoff in case of power failure which might affect the
operation of solenoid operated valves or other components of
apparatus housed in cabinet 1.
A conduit 16 connects manual valve 15 with solenoid controlled
valve 17 which normally acts as the main water control valve for
cabinet 1 and all accessories therein which are sup-plied with
water. Valve 17 is operated by a solenoid indicated at 18 which may
be energized through power lines 19 which are connected to a source
of electric power and preferably are controlled by a switch located
at cabinet 1.
Water flowing through valve 17 when the valve is open then flows
through conduit 20 to a manifold 21 mounted at 22 on partition 13.
Manifold 21 may serve as the source of water supply for all
accessories which may be housed in cabinet 1.
For the purpose of the handpiece drip control system a cold water
outlet line 23 is connected to and extends from manifold 21 to a
tee 24 and connects by branch line 25 to a water heater 26. Another
section 27 of cold water line 23 extends from tee 24 to provide
cold water for other various dental accessories within cabinet
1.
A heated water outlet line 28 extends from a tee 29 connected to
the hot water outlet 30 of water heater 26 and connects to a
pressure regulator 31. Regulator 31 may be adjusted to provide the
desired water pressure for the various handpieces 5 supplied with
water from the pressure regulator 31 through its outlet 32.
Another heated water line 33 extends from tee 29 to provide heated
water to other dental apparatus, such as a dental syringe, a
patient drinking cup and the like.
Regulator 31 may be supported on an intermediate partition member
34 which is mounted within cabinet 1 and may be attached to member
34 by flanges 35.
A water pressure gauge 36 is connected with pressure regulator
outlet 32 by a conduit 37, and an outlet conduit 38 from gauge 36
is connected to the water inlet 39 of an air operated water coolant
supply valve 40.
Valve 40 may be attached to partition member 35 by flanges 41 which
are connected to the air inlet 42 of valve 40. A flexible conduit
43 extends from inlet 42 of valve 40 to footpedal 6 through
flexible conduits 7 and 9, and junction box 8.
A conduit 44 extends from water outlet 45 of valve 40 to a tee 46.
A handpiece cooling water supply line 47 extends from tee 46 to a
master selector valve block 48.
Valve block 48 contains a number of valves, one for each handpiece
to be supplied with coolant water, and is positioned remote from
foot controller 6 in cabinet 1. Individual air control lines 49, 50
and 51 may connect with block 48 and switch means (not shown) which
may be mounted on tray platform 3, or on cabinet 1, for selectively
operating the coolant water valves within block 48. Lines 49-51
preferably are supplied with air which passes through and is
controlled by valve 71 within foot controller 6.
Valve block 48 also may contain valves for supplying coolant air to
the individual handpieces and also for supplying the drive air, dry
or oil saturated, to the handpiece turbines.
Water coolant supply lines 52, 53 and 54 extend from their
respective valves within block 48 and connect with handpiece
metering valves 55, 56 and 57, respectively. Flexible outlet tubes
58, 59 and 60 extend from their respective metering valves 55-57
and connect with individual handpieces 5.
Tubes 58-60 may extend through cabinet 1, tray arm 2 and support
platform 3 to supply coolant water to handpieces 5, should
handpieces 5 be mounted on platform 3 as shown in FIG. 1.
A water exhaust line 61 extends from tee 46 to an air actuated
water exhaust valve 62 which may be mounted on intermediate
partition 34. A drain line 63 connects the water outlet 64 of valve
62 to a collection funnel 65 connected through drain pipe 66 with
the main drain or waste pipe connection in cabinet 1.
A flexible air tube 67 connects to the bottom of valve 62 through a
choke 68 and connects through junction box 8 to foot controller 6.
The function and operation of valves 40 and 62 (FIG. 4) connected
to controller 6 by air lines 43 and 67 is discussed below.
Metering valves 55-57 are provided with knobs 69 to enable the
dentist or dental assistant to individually regulate the water
coolant flow rate to handpieces 5.
Foot controller 6 (FIG. 3) is similar in construction and operation
to the foot controller construction shown in U.S. Pat. No.
3,359,638 and has a main air drive control valve 70, an air coolant
control valve 71 and a water coolant control valve 72.
The main air flow supply enters through air supply line 73 into a
manifold 74, and from manifold 74 is distributed to the air drive
control valve 70 through a coupling nipple 75, to the air coolant
control valve 71 through an air supply line 76, and to water
coolant control valve 72 through an air supply line 77.
Control valves 71 and 72 are provided with spring biased operating
levers 78 and 79, respectively, which are actuated by a cam 80
pivotally mounted at one end of a foot operated actuating arm 81.
Air drive control valve 70 is actuated by a plunger 82 controlled
by a pair of rollers 83 mounted on cam 80.
The flow of air from air drive control valve 70 leaves foot
controller 6 through air supply line 84 for the main drive of a
turbine of a dental handpiece 5. The air coolant spray for a dental
handpiece leaves valve 71 through air line 85.
The air flow for actuating water coolant supply valve 40 leaves
valve 72 through air line 86 and may connect with air line 43
through a coupling 87. An air exhaust line 88 leaves valve 72 and
connects with air line 67 for actuating exhaust valve 62, through a
check valve 89.
An air exhaust line 90 leaves air coolant control valve 71 and
extends into hose 7 where its open end terminates into the
atmosphere.
Coolant water supply valve 40 (FIG. 4) and water exhaust valve 62
are similar and have a usual valve construction with a valve seat
91 for a lifter valve 92. When air is flowing through line 43 and
inlet 42, piston 93 moves along valve bore 94 compressing spring 95
and raising lifter valve 92 from seat 91 by contacting a valve stem
96 which in turn raises floating stem 97 of lifter valve 92. Water
then flows through valve 40 between lines 38 and 44 connected to
water intake 39 and water outlet 45, respectively.
Springs 95, 98 and 99 return piston 93, valve stem 96 and lifter
valve 92, respectively, to their at rest position (FIG. 4) when the
flow of actuating air in line 43 is blocked by water coolant supply
valve 72 in foot controller 6.
The dentist desiring to use a handpiece 5 to perform dental work on
a patient, removes a selected handpiece 5 from its holder 100 on
platform 3; for example handpiece 5 associated with supply lines 58
and 52 (FIG. 2).
The dentist moves foot control actuating arm 81 in a
counterclockwise direction, (indicated by arrow A, FIG. 3) to
actuate the handpiece drive turbine and to supply coolant water to
the handpiece. The particular coolant water supply valve within
valve block 48 controlling the flow of water to the selected
handpiece also may be opened simultaneously by the counterclockwise
movement of arm 81 or may be controlled by other usual actuating
means.
Counterclockwise movement of arm 81 and connected cam 80 depresses
valve levers 78 and 79 of control valves 71 and 72, respectively,
and plunger 82 of main air drive valve 70 as described in U.S. Pat.
No. 3,359,638.
Compressed air from manifold 74 then flows through water coolant
control valve 72 to inlet 42 of control valve 40 by way of air
supply lines 77, 86 and 43. The compressed air flow upon entering
valve 40 raises lifter valve 92 permitting coolant water to flow to
selected handpiece 5 from water heater 26 through lines 28, 37, 38,
44, 47, 52 and 58.
The dentist releases foot control arm 81 upon completion of the
drilling or cutting operation for which coolant water was supplied,
and arm 81 returns automatically to its at rest position of FIG. 3.
Spring 99 in valve 40 immediately returns lifter valve 92 to valve
seat 91 blocking further flow of coolant water from line 38 through
valve 40 into line 44.
In accordance with the invention the compressed air trapped in air
supply lines 43 and 86 exhausts into air lines 88 and 67 through
valve 72, upon closing of valve 72 by release of arm 81. The
exhausted air entering valve 62 through line 67 opens valve 72 in a
similar manner as described for valve 40.
The water trapped under pressure in lines 44, 47, 52 and 58 between
valve 40 and handpiece 5 immediately begins to flow through open
valve 62 from line 61 and tee 46 into line 63. The trapped water
reverses its flow to flow away from handpiece 5 and flows through
open valve 62 due to the additional pressure required to force the
coolant water through a small spray opening in handpiece 5 then
through the opening in valve 62 which is considerably larger than a
spray opening in the handpiece. Likewise, a back pressure is
created by the coolant water as it is forced through the small
handpiece spray opening which helps force the trapped water through
valve 62 when opened.
The control means for the individual water coolant valves in
control block 48 is such that upon closing of valve 72, and valve
40, the individual valve which is open will remain open a short
period of time after valve 40 closes and valve 62 opens. This may
be accomplished by exhausting the air trapped in line 49 after
closing of valve 71 by release of arm 81, more slowly than the
trapped air in control line 43 for valve 40.
This short time delay enables sufficient water to exhaust from
lines 52 and 58 so that after the valve within block 48 closes, the
remaining pressure in lines 52 and 58 is insufficient to force the
remaining water through a spray opening in the handpiece.
The exhaust water in line 63 empties into funnel 65 and through
drain line 66 into the main waste drain for cabinet 1.
That portion of exhaust air which passes from line 43 through valve
72 to actuate valve 62, is trapped in line 67 by check valve 89 in
foot controller 6. This trapped air exhausts slowly through choke
68 thereby closing valve 62 slowly to enable the remaining trapped
water in lines 44 and 47 to flow through valve 62 into line 63.
Choke 68 also muffles the sound of the air exhausting from line 67
to insure a quiet operation.
The remaining portion of air trapped in line 43 exhausts through a
small relief opening 101 formed in connector 102 between air line
88 and water coolant control valve 72.
The sequence of operation described above during which the trapped
water and pressure is exhausted requires a very short period of
time and the operation of valves 40 and 62 and the valve of block
48 is almost simultaneous so that the exhaust operation is
completed should the dentist desire to reactuate the handpiece
again immediately after release of arm 81.
The pressure regulator 31 in normal operation and use of the
handpieces and associated handpiece drip control system is adjusted
to provide the desired pressure for water supplied to all the
handpieces from valve block 48. Metering valves 55-57 also are
adjusted individually to control the volume of water supplied at
the selected pressure to the handpieces. This enables various types
of handpieces, each of which may require a different volume of
water, to be supplied with coolant water through valve block 48.
Usually these adjustments, once made, need not be changed except
when water supply pressure from the water main changes
significantly.
Although the water is supplied to handpieces 5 for cooling during
drilling and cutting operations, the water preferably is heated to
a moderate temperature to prevent shock to the tooth being drilled
or associated tooth nerve, and to eliminate variance in the coolant
water temperature due to changes in the main water supply entering
through line 10.
The new handpiece drip control system is very simple in
construction and operation and utilizes standard components for the
control valves, metering valves, pressure regulators, water and air
lines, and the like. These components do not require delicate
adjustments and require little, if any, servicing.
The improved apparatus and system enables the dentist repeatedly to
use the dental handpieces without the water trapped within the
supply line dripping from the handpiece onto the patient, dentist,
equipment, etc.
Accordingly, the handpiece drip control system achieves the
objectives indicated and solves problems that have existed in the
art, particularly the elimination of the heretofore handpiece
coolant water drippage after use of a handpiece.
In the foregoing description, certain terms have been used for
brevity, clearness and understanding but no unnecessary limitations
are to be implied therefrom beyond the requirements of the prior
art, because such terms are used for descriptive purposes and are
intended to be broadly construed.
Moreover, the description and illustration of the invention is by
way of example, and the scope of the invention is not limited to
the exact details of the construction shown or described.
Having now described the features, discoveries and principles of
the invention, the manner in which the dental handpiece drip
control system is constructed, assembled and operated, the
characteristics of the new system, and the advantageous, new and
useful results obtained; the new and useful structures, devices,
elements, arrangements, parts, and combinations are set forth in
the appended claims.
* * * * *