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Патент USA US3069786

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Dec. 25, 1962
K. H. LIEDBERG ETAL
3,069,776
FLUID DISPENSING APPARATUSES FOR DENTAL ENGINES
Filed April 21, v195s
3 Sheets-Sheet 1
Fig. 5
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Dec. 25, 1962 ‘4
K. H. LlEDBERG ETAL
3,069,776
FLUID DISPENSING APPARATUSES FOR DENTAL ENGINES
Filed April 21, 1958
3 Sheets-Sheet 2
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DEQ- 25, 1962
K. H. LIEDBERG ETAL
3,069,776
FLUID DISPENSING APPARATUSES FOR DENTAL ENGINES
Filed April 21, 1958
3 Sheets-Sheet 3
United States atent O T1C6
1
3,069,776
Patented Dec. 25, 1962
2
3,069,776
the conventional dental unit which carries the various
FLUID DISPENSING APPARATUSES FOR
tools and accessories used by a dentist. This dental engine
DENTAL ENGINES
stand is adapted for use in connection with pressure ?uid
Kurt Herman Liedberg and Stig Folke Adrian Peterson,
driven dental engines 3 but the invention is not limited
Shara, Sweden, assignors to Atlas Copcor Alrtieholag,
to the combination with dental engine stands for such
Nacka, Sweden, a corporation of Sweden
engines and may be used in connection with pressure
Filed Apr. 21, 1958, Ser. No. 729,775
liquid driven or electrically driven dental engines also.
4 Claims. (Cl. 32—28)
The illustrated casing 1 contains a pressure reduction
This invention relates to a ?uid dispensing apparatus
valve device 4 and for each dental engine an automatic
for dental engines. An apparatus of this type may pref
erably be combined with a dental engine stand, for in 10 valve device 5. Furthermore, the casing contains a dis
tributing valve device 6 for the cooling or spraying ?uid
stance of the type described in the assignee’s co-pending
and in the front portion a holder 7 for each dental engine
US. application, Serial No. 685,921, ?led September 24,
3.
The dental engine 3‘ may be of the type described
1957, now Patent No. 2,942,757, 'by K. "H. Liedberg et al.
in the assignee’s ‘co-pending application, Serial No. 566,
The ?uid dispensing apparatus according to the invention
may, however, also be combined with dental engine stands 15 654, ?led February 20, 1956, now Patent No. 2,855,671,
by Lundgren et al. Compressed air is supplied to the
of other types which include a device responsive to the
pressure reduction valve device 4 through a hose 8 and
power consumption by a dental engine. The dental en
compressed air of reduced pressure controlled by the
gine stand described in the above numbered application
adjustment of a suitable control wheel 9 ?ows from the
includes a pressure reduction valve device carrying a
micro-switch which is operated to close an electric circuit 20 pressure reduction valve device 4 through conduits 10
to each one of the automatic valve devices 5. A lever
as soon as power is consumed by any of a number of
11 controls a shut-off valve in the device 5 to open or
dental engines ?tted to the stand. One object of the
shut off an air passage communicating through a hose
present invention is to provide a fluid dispensing apparatus
12 with the dental engine 3. When the lever 11 is in
which is of a simple construction and which automatically
open
position the supply of compressed air to the dental
25
supplies ?uid to a dental engine for cooling the tool
engine 3 is opened as soon as the dental engine 3 is lifted
driven by said engine and the tooth or the like operated
from a trip lever 13 which carries the holder 7 and
on with said tool. The ?uid may comprise water, a mix~
operates the stem 14 of an automatic check valve in
ture of water and compressed air, or compressed air only.
the automatic valve device 5. When the dental engine
A further object of the invention is to provide a dispensing
apparatus including a receptacle for spray water which 30 3 has been removed from the holder 7 operation of the
dental engine is controlled by a ?nger-tip control 15 at
is easily removable and attached. Still further objects
of the invention will be apparent by the following speci?
cation, clairns and drawings which illustrate by way of
the dental engine. The illustrated dental engine stand 1
is designed for two dental engines and a hose 16 and 17,
example one embodiment of a ?uid dispensing apparatus 35 respectively, leads from the distributing valve device ‘6
to each dental engine 3.
according to the invention.
The ?uid dispensing apparatus illustrated in FIGS. l-3
For the above and other purposes We provide a ?uid
and 5 consists of a valve device comprising a housing 20
dispensing apparatus for dental engines comprising in
provided with a clamp 21 for clamping the housing to the
post 2 carrying the dental engine stand. The housing 20
pressed air to said valve device, a liquid receptacle re 40
contains a valve casing 22, 23 accommodating a pressure
movably attached to said valve device, a liquid conduit
reduction valve and an electro-magnetic valve. The pres
communicating with said receptacle and leading to a
sure reduction valve consists of a valve member 24 mov
dental engine, a casing forming an air chamber in said
able in a bore 25 and having a square or other non-circu
valve device communicating with the receptacle, an air
lar stem 26 guided in a bushing 27 and pressed against
passage from the valve device to said air chamber for 45
membrane bellows 28 by a spring 29 provided in an
producing air pressure in the air chamber to press liquid
extension 3% of the bore 25. The membrane bellows 28
from the receptacle to said dental engine, and means for
is loaded ‘by a helical spring 31 the tension of which may
removing said air pressure upon interruption of power
be adjusted by means of a knob 32 screw-threaded on
combination a valve device, means for supplying com
consumption of the dental engine.
an extension 33 of a cover 34 enclosing the membrane
In the accompanying drawings FIG. 1 is a side view 50
bellows 28.
of a ?uid dispensing apparatus according to the inven
vCompressed air is supplied to the valve casing 22
tion, and FIG. 2 a section on line II-—II in FIG. 1. FIG.
through a hose 35 branched off from the hose 8 and ?tted
3 is a section on line III-—III in FIG. 2. FIG. 4 is a
to a nipple 36 which through a bore in the casing 22
side view and partial section of a dental engine stand
communicates with the extension 39 of the bore 25.
with which the apparatus accordingto FIGS. 1-3 may 55 Passages
37 in the bushing 27 communicate with a pas
be combined, and FIG. 5 is a section and partial side
sage 38 in the casing 22 which through a passage 39 com
elevation of a throttle valve device combined with the
municates with a chamber 40 at one side of the membrane
apparatus and arranged on the dental engine stand illus
bellows 28 and furthermore through a passage 41 with
trated in FIG. 4.
a bore 42 through an opening 43 controlled by an electro
The dental engine stand illustrated in FIG. 4, which 60 magnetically operated valve member 44 disposed in the
may be of the design described in K. H. Liedberg’s et al.
casing 23. The bore 42 communicates through a passage
co~pending application, Serial No. 685,921, now Patent
45 with an air chamber 46 in a head '47 secured to the
No. 2,942,757, consists of a housing 1 which is carried on
underside of the housing 20 by means of screws 48.
a post 2, or on a bracket extending from a wall or from
The electro-magnetically operated valve member 44 has
3,069,776
it
3
a valve surface 4? which cooperates with a seat 50 and
controls an outlet passage 51 leading to a muf?er 52 pro
vided with outlet openings at 53. The passage 51 nor
mally communicates with the bore 42 when the valve
According to the setting of the valve member 73 more
member 44 is pressed towards the opening 43 by a spring
sage 6? and hose 70 to the passage 80. The mixture of
water and compressed air in the passage 80 ?ows through
the hose 81 to the distributing valve device 6 and from
said valve device through the hose 16 or 17, respectively,
54. Energization of the coil 55 in the casing 23 moves
the valve member ‘44 towards the seat 50 and uncovers
the opening 43. The coil 55 is connected by an electric
cable 56 to a micro-switch 18 in the dental engine stand.
or less water is then supplied from the bore 76 through
the bore 79 to the bore 80 in which it is mixed with com
pressed air supplied from the chamber 46 through pas
to the dental engine at present in operation and produces
The micro-switch is operated by a valve stem 19 disposed 10 a spray of ?nely divided water and air around the tool .
in the pressure reduction valve device 4. When a dental
engine 3 is operated the pressure drop in the pressure
and the object worked upon with the tool, for instance a
tooth. When the dentist releases the control 15 and
thereby stops the engine the micro-switch breaks the cir
cuit through the coil 55 and the air chamber 46 is then
through the coil 55.
15 vented to the atmosphere silently through the mu?‘ler 52.
The above described ?uid dispensing apparatus should
The head 47 carries a receptacle 57 for distilled water
reduction valve device 4 moves the stem 19 so as to
operate the micro-switch 18 to close an electric circuit
which is ?tted to the head 47 by means of two pins 58
engaging bayonet openings 59 in the receptacle 57. An
O-ring 60 provides a seal between the receptacle 57 and
the head 47 to prevent escape of compressed air from the
chamber 46. 61 indicates an air- and water-tight opening
in the receptacle covered by a suitable transparent ma
terial such as Plexiglas or the like. 62 is a ?oat which
be considered only as an example and the details of the
invention may be modi?ed in various different ways with
out departing from the scope of the following claims. A
shut-01f valve may for instance be provided in the hose
70 when it may be desired to spray with water only. It
is also obvious that if the valve member 73 is closed no
water is supplied through the spray ?uid tube 16 or 17,
respectively, which is then only supplied With air.
when visible through the opening 61 indicates the amount
What we claim is:
of distilled water remaining in the receptacle 57. A pipe 25
1. A pressure ?uid driven dental engine having a ?uid
63 ?tted in the bore 64 in the head 47 projects towards
dispensing apparatus attached thereto, said apparatus com
the bottom of the receptacle 57 and communicates with
prising in combination a support, a liquid receptacle car
a passage 66 in the head 47 which through a hose 67 is
ried by said support, a liquid conduit communicating with
connected to a throttle valve casing 68. A further pas
sage 69 in the head 47 forms a communication between 30 said receptacle and leading to said dental engine, said con
the chamber 46 through a hose 70 and the throttle valve
casing 68. The throttle valve casing 68> is secured to the
dental engine stand by means of a bracket 71 and a screw
duit terminating in liquid spray means mounted on said
dental engine, an air passage in said support communicat
ing with a source of air pressure and with said receptacle
for supplying air pressure on the liquid in the receptacle,
72. The casing 68 contains a throttle valve member 73
which has a screw-threaded portion '74 engaging screw 35 means on said support for controlling ?ow of air from said
passage to said receptacle, means for controlling ?ow of
threads 75 in a bore '76. A spindle 77 carrying the valve
pressure ?uid through said engine for driving a rotary tool,
member 73 and a knob 78 may be turned to operate the
valve member 73 which cooperates with a bore 79 com
and means on said support operable in response to flow of
municating wit-h a passage 80 in the casing 63 leading
pressure ?uid through said engine for operating said flow
from the hose 76 to a hose 81.
The passage 79 may be
controlling means to admit air pressure to said receptacle.
brought into communication with the hose 67 through
the bore 76 by opening the needle valve 73. The hose
2. A pressure ?uid driven dental engine having a ?uid
dispensing apparatus attached thereto, said apparatus com
81 conveys a mixture of water and compressed air to the
distributing valve device 6 from which valve device said
prising in combination a support, a liquid receptacle car
ried by said support, a liquid conduit communicating with
mixture is conveyed through the conduits 16 or 17, respec 45 said receptacle and leading to said dental engine, said con
duit terminating in liquid spray means mounted on said
tively, to the dental engine 3 which is momentarily in
dental engine, an air passage in said support communicat
action and lifted from its holder 7.
ing with a source of air pressure and with said receptacle
The operation of the above described apparatus is as
for supplying air pressure on the liquid in the receptacle, 9.
follows:
Before the apparatus is taken into use the receptacle 57 50 pressure reduction valve device on the support in said air
passage, an air chamber on said support communicating
is removed and ?lled with distilled water. The receptacle
with the receptacle, a part of said air passage leading from
is then attached to the head 47 by means of the bayonet
said pressure reduction valve device to said air chamber
?tting 58, 59. Compressed air is supplied to the exten
for providing air pressure in the air chamber to force liquid
sion 30 of the bore 25 through the hose 35 and the knob
32 is set so that a desired reduced air pressure is obtained 55 from the receptacle to the spray means on the dental
engine, an automatic valve device on said support in the
in the space at} and the passage 41. The coil 55 is un
energized and the valve member 44 is pressed by the
air passage to the air chamber, a vent passage in said auto
spring 54 to keep the opening 43 closed, When the
dentist has removed the dental engine 3 from the holder
matic valve device leading from the air chamber, said au
tomatic valve device being operable in response to pres
7 and presses the control 15 to start the engine a pressure 60 sure ?uid ?ow to the dental engine to open said air pas
drop is produced in the pressure reduction valve device 4
sage to said air chamber when such ?uid ?ow occurs and
which causes the stem H to operate the micro-switch 18.
to close such passage and to open said vent passage when
The micro-switch then closes the circuit from a suitable
said ?uid ?ow is interrupted, and means for controlling
electric source through the cable 56 and the coil 55‘which
?ow of pressure ?uid through said engine for driving a
rotary tool.
is energized and moves the valve member 44 towards
the seat 50 so that the venting passage from the chamber
3. An apparatus as de?ned in claim 2 in which a mu?ier
'46 is closed and the opening 43 is uncovered. (In con
is provided in said vent passage.
nection wit-h electric dental engines the closing of the
4. A pressure ?uid driven dental engine having a ?uid
circuit to the engine by the dentist’s foot-switch may re
dispensing apparatus attached thereto, said apparatus com
place the above mentioned micro-switch for closing a cir 70 prising in combination a support, a liquid receptacle can
cuit to the coil 55'.) Compressed air of reduced pressure
ried by said support, a liquid conduit communicating with
is then supplied through the passage 41, the bore 42 and
said receptacle and leading to said dental engine, said con
the passage 45 to the chamber 46 and presses water from
duit terminating in liquid spray means mounted on said
the receptacle 57 through the pipe 63, bore 64, passage
dental engine, an air passage in said support communicat
66, hose 67 to the bore 76 in the throttle valve casing 68. 75 ing with a source of air pressure and with said receptacle
3,069,776
5
for supplying air pressure on the liquid in the receptacle,
6
References Cited in the ?le of this patent
a vent passage, means on said support for controlling flow
UNITED STATES PATENTS
of air from said air passage to said receptacle and from
said receptacle through said ‘vent passage, means for con
trolling ?ow of pressure ?uid through said engine for driv
ing a rotary tool, and means on said support operable in
response to ?ow of pressure fluid through said engine for
operating said ?ow controlling means to admit air pres
sure to said receptacle.
2,245,036
2,25 3,143
Henschel ____________ __ June 10, 1941
Siegel _______________ _- Aug. 19, 1941
2,532,05 4
Broussard et a1. ______ __ Nov. 28, 1950‘
2,664,632
Norlen _______________ -_ Jan. 5, 1954
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