U.S. patent application number 11/246846 was filed with the patent office on 2006-04-13 for electro-mechanical flush mechanism.
This patent application is currently assigned to DOMETIC SANITATION CORPORATION. Invention is credited to James A. Sigler.
Application Number | 20060075546 11/246846 |
Document ID | / |
Family ID | 35610005 |
Filed Date | 2006-04-13 |
United States Patent
Application |
20060075546 |
Kind Code |
A1 |
Sigler; James A. |
April 13, 2006 |
Electro-mechanical flush mechanism
Abstract
A toilet for a recreational vehicle, boat or the like is
provided, which includes an electro-mechanical flush mechanism. The
flush mechanism includes an actuating mechanism for activating
either a flush cycle or an add water cycle. The flush mechanism
further includes a flush valve, a water inlet valve, a motor, a
drive mechanism and a spring. During operation of the flush
mechanism, the spring biases the drive mechanism in a direction
such that the flush valve rotates. A motor arm connected to the
motor moves the drive mechanism in a direction such that the flush
valve rotates in an opposite direction.
Inventors: |
Sigler; James A.;
(Perrysville, OH) |
Correspondence
Address: |
PEARNE & GORDON LLP
1801 EAST 9TH STREET
SUITE 1200
CLEVELAND
OH
44114-3108
US
|
Assignee: |
DOMETIC SANITATION
CORPORATION
Big Prarie
OH
|
Family ID: |
35610005 |
Appl. No.: |
11/246846 |
Filed: |
October 7, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60617103 |
Oct 8, 2004 |
|
|
|
Current U.S.
Class: |
4/434 |
Current CPC
Class: |
B63B 29/14 20130101;
B60R 15/04 20130101; E03D 5/10 20130101; E03D 1/34 20130101 |
Class at
Publication: |
004/434 |
International
Class: |
E03D 11/10 20060101
E03D011/10 |
Claims
1. A flush mechanism for a toilet comprising: a rotatable flush
valve; a drive mechanism operatively connected to the flush valve;
a motor to move the drive mechanism; and, a spring operatively
connected to the drive mechanism to bias the drive mechanism in a
direction so as to rotate the flush valve.
2. The flush mechanism of claim 1, wherein the spring biases the
drive mechanism in a direction so as to rotate the flush valve to
an open position.
3. The flush mechanism of claim 2 further comprising a drive arm
slot located at an end of the drive mechanism.
4. The flush mechanism of claim 3 further comprising a motor arm
operatively connected to the motor to engage the drive arm slot to
thereby move the drive mechanism in a direction so as to rotate the
flush valve to a closed position.
5. The flush mechanism of claim 1, wherein the spring biases the
drive mechanism in a direction so as to rotate the flush valve to a
closed position.
6. The flush mechanism of claim 5 further comprising a drive arm
slot located at an end of the drive mechanism.
7. The flush mechanism of claim 6 further comprising a motor arm
operatively connected to the motor to engage the drive arm slot to
thereby move the drive mechanism in a direction so as to rotate the
flush valve to an open position.
8. The flush mechanism of claim 1 further comprising a flush/add
water switch to energize the motor and a water inlet valve for a
limited period of time.
9. The flush mechanism of claim 8 further comprising a cam switch
to energize the motor and the water inlet valve after initial
energization by the flush/add water switch.
10. The flush mechanism of claim 1 further comprising a power boost
bar operatively connected to the drive mechanism.
11. The flush mechanism of claim 10 further comprising a projection
operatively attached to the motor arm to contact the power boost
bar to move the drive mechanism in a direction so as to rotate the
flush valve.
12. The flush mechanism of claim 1 further comprising a flush rod
operatively connected to the motor arm to operate the flush
mechanism manually.
13. A flush mechanism for a toilet comprising: a frame; a support
structure operatively connected to the frame; a rotatable flush
valve positioned in the support structure; a rotor shaft
operatively connected to the flush valve; a rotor cam coupled to
the rotor shaft; a drive arm operatively connected to the rotor cam
at a first end and to the frame at a second end; a motor to move
the drive arm; and, a spring operatively connected to the frame at
one end and to the rotor cam at the opposite end to bias the drive
arm in a direction so as to rotate the flush valve.
14. The flush mechanism of claim 13, wherein the flush valve
rotates to an open position.
15. The flush mechanism of claim 14, wherein the motor moves the
drive arm in a direction so as to rotate the flush valve to a
closed position.
16. The flush mechanism of claim 13, wherein the flush valve
rotates to an closed position.
17. The flush mechanism of claim 16, wherein the motor moves the
drive arm in a direction so as to rotate the flush valve to a
closed position.
18. A method of flushing a toilet comprising the steps of:
activating an actuating mechanism; activating a flush/add water
switch; energizing a motor and a water inlet valve; disengaging a
motor arm from a drive arm slot; biasing a drive mechanism in a
direction so as to rotate a flush valve; and, re-engaging the motor
arm in the drive slot so as to rotate the flush valve to in an
opposite direction.
19. The method of claim 18, wherein during the step of biasing a
drive mechanism in a direction so as to rotate a flush valve to an
open position the method further comprising the steps of:
deactivating the flush/add water switch; and, activating a cam
switch to energize the motor and water inlet valve.
20. The method of claim 19 further comprising the steps of:
providing a power boost bar operatively connected to the drive
mechanism and a projection operatively connected to the motor arm;
wherein prior to the step of re-engaging the motor arm in the drive
slot so as to rotate the flush valve the method further comprising
the step of: contacting the projection to the power boost bar to
drive the drive mechanism a direction so as to rotate the flush
valve in the same direction.
Description
[0001] This application claims the benefit of U.S. Provisional
Patent Application No. 60/617,103 filed on Oct. 8, 2004.
FIELD OF INVENTION
[0002] The present invention relates to toilets. More particularly,
the present invention relates to a toilet and flush mechanism that
is suitable for a boat, recreational vehicle (RV), bus or the
like.
BACKGROUND OF THE INVENTION
[0003] The toilet according to the present invention may either be
of the gravity drop through type or of the vacuum type (such as
generally shown in U.S. Pat. No. 5,621,924, the disclosure of which
is hereby incorporated by reference).
[0004] There currently exist in the marine and RV industries,
vacuum toilets and gravity drop toilets that are foot pedal or
lever operated. These are manually operated toilets where a flush
valve is opened by the operator and remains open as long as the
operator activates the pedal or lever.
[0005] In regard to vacuum toilets, if the flush valve is open for
too short a period of time, insufficient water may accompany the
waste, which may increase the possibility of the system plugging. A
short duration flush also limits the amount of vacuum utilized in
the flush and reduces the force that macerates the waste, which
also increases the possibility of the system plugging. If the flush
valve is open for an extended period of time, then excessive water
is utilized. Additionally, if a second flush cycle is activated
before the full level of vacuum is restored, the reduced level of
vacuum may not have sufficient force to macerate the sewage, and
system plugging may result.
[0006] In regard to gravity drop toilets, if the flush valve is
open for too short a period of time, then repeated opening of the
flush valve may be required to clear the toilet bowl. If the flush
valve is open for an extended period of time, then excessive water
is utilized and it increases the possibility that malodor from the
holding tank may enter the bathroom via the flush valve.
[0007] Because these toilets are manually operated, the timing
between the flush valve and water valve is fixed and allows only
one residual water level. Further, while "dry camping" or in rough
seas, a lower level of residual water is desirable. When water is
plentiful or in calm seas, a higher level of residual water may be
desired.
[0008] Thus, what is needed is a toilet for use in the marine and
RV industries that overcomes the above mentioned disadvantages.
SUMMARY OF THE INVENTION
[0009] In accordance with one aspect, a flush mechanism for a
toilet is provided comprising, a rotatable flush valve, a drive
mechanism operatively connected to the flush valve, a motor to move
the drive mechanism, and a spring operatively connected to the
drive mechanism to bias the drive mechanism in a direction so as to
rotate the flush valve.
[0010] In accordance with another aspect of the present invention,
a flush mechanism for a toilet is provided comprising, a frame, a
support structure operatively connected to the frame, a rotatable
flush valve positioned in the support structure, a rotor shaft
operatively connected to the flush valve, a rotor cam coupled to
the rotor shaft, a drive arm operatively connected to the rotor cam
at a first end and to the frame at a second end, a motor to move
the drive arm, and a spring operatively connected to the frame at
one end and to the rotor cam at the opposite end to bias the drive
arm in a direction so as to rotate the flush valve.
[0011] In accordance with another aspect of the present invention,
a method of flushing a toilet is provided comprising the steps of
activating an actuating mechanism, activating a flush/add water
switch, energizing a motor and a water inlet valve, disengaging a
motor arm from a drive arm slot, biasing a drive mechanism in a
direction so as to rotate a flush valve, and re- engaging the motor
arm in the drive slot so as to rotate the flush valve to in an
opposite direction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] These and other aspects and advantages of the present
invention will be described in detail with reference to the
accompanying drawings, in which:
[0013] FIG. 1 is a side view of an exemplary toilet according to
the invention.
[0014] FIG. 2 is a top view of the toilet shown in FIG. 1.
[0015] FIG. 3 is a front view of the toilet shown in FIG. 1.
[0016] FIG. 4 is a perspective view of one embodiment of the flush
mechanism in a closed state for the toilet of FIGS. 1-3.
[0017] FIG. 5 is a perspective view of the flush mechanism of FIG.
4 in an open state.
[0018] FIG. 6 is a perspective view of the flush mechanism of FIG.
4 in a closing state.
[0019] FIG. 7 is a perspective view of the flush mechanism of FIG.
4 in an emergency use state.
[0020] FIG. 8 shows a timing chart showing the operation of the
toilet in accordance with the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0021] FIGS. 1-3 show a toilet 10 (either vacuum or drop through)
in accordance with the present invention having a substantially all
china one-piece combination bowl and base 11, with a conventional
toilet seat 12 and cover 13. In exterior appearance, the toilet 10
generally resembles conventional toilets in both size and material
found in homes, businesses and the like. The toilet 10 includes an
actuating mechanism 16 that activates either a flush mode or an add
water mode. The actuating mechanism 16 can be any type of actuating
mechanism known in the art such as, but not limited to, a foot
pedal, a lever, a pushbutton, a rocker switch, etc. Further, the
actuating mechanism can be located on the toilet, as shown in FIGS.
1-3, or it can be located near the toilet, for example, on a wall,
a cabinet, a counter, etc. located near the toilet.
[0022] FIG. 4 shows a flush mechanism 20 in a closed state in
accordance with the present invention. The flush mechanism 20
includes a frame 21 and a flush valve 22, which is positioned in a
ring-like cylindrical-support structure 24. The support structure
24 is connected to one end of the frame 21 as shown in FIG. 4 and
provides support for the flush mechanism 20. The support structure
24 can be connected to the frame by any means known in the art such
as with screws, rivets, straps, etc. The flush valve 22 is coupled
to a rotor cam 26 via a rotor shaft 28. During operation of the
flush mechanism 20, described further below, a motor 30 rotates the
rotor cam 26, which in turn rotates the rotor shaft 28, which
rotates the flush valve 22.
[0023] The motor 30 further includes a motor arm 38 to move a drive
mechanism such as a drive arm 32 to thereby rotate the rotor cam
26. A first end 33 of the drive arm 32 is connected to a cam pin
34. The cam pin 34 is connected to the rotor cam 26 and extends in
an outward direction from the rotor cam 26. A second end 35 of the
drive arm 32 is connected to the frame 21 at an end opposite the
support structure 24. The second end 35 of the drive arm 32 further
includes a drive arm slot 36, which receives the motor arm 38. A
spring 40 is attached to the frame 21 at one end and to the rotor
cam 26 at the opposite end. During operation of the flush mechanism
20, the spring 40 biases the drive arm 32 in a direction such that
the flush valve 22 rotates to an open position. When the flush
valve 22 is in a closed position, i.e. the flush mechanism 20 is
not in operation, the motor arm 38 engages the drive arm slot 36
thereby preventing the spring 40 from biasing the drive arm 32 to
open the flush valve 22.
[0024] Referring to FIGS. 4-7, operation of the flush mechanism
will now be described. In the flush mode the user activates the
flush mechanism 20 by activating the actuating mechanism 16. Once
the flush mechanism 20 is activated a flush/add water switch is
momentarily activated, for example for 0.5 seconds, thereby
initially energizing the motor 30 and a water inlet valve. The
motor 30 begins to rotate the motor arm 38 in such a manner that
the motor arm 38 is disengaged from the drive arm slot 36. As the
motor arm 38 disengages from the drive arm slot 36 the drive arm 32
is released and the spring 40 begins to rotate the rotor cam 26
which in turn biases the drive arm 32 in the direction indicated by
the arrow 42. As the drive arm 32 is further biased in the
direction of the arrow 42, the rotor cam 26 rotates, which rotates
the rotor shaft 28 thereby rotating the flush valve 22 to an open
position as shown in FIG. 5. As the motor 30 continues to rotate,
the motor arm 38 re-engages the drive arm slot 36 thereby moving
the drive arm 32 in a direction opposite that of the arrow 42. As
the drive arm 32 moves in the direction opposite to the arrow 42
the rotor cam 26 rotates in a direction such that the flush valve
22 begins to close as shown in FIG. 6. Once the motor arm 38
completely re-engages the drive arm slot 36 the flush valve 22 is
in a closed position as shown in FIG. 4, the cam switch 44 is
deactivated and the flush cycle is complete.
[0025] It should be noted that the present invention is not limited
to the embodiment described above or below and shown in the
FIGURES. In other words, the present invention can operate in a
manner where the spring 40 biases the drive arm 32 in a direction
such that the flush valve 22 rotates to a closed position. Further,
the motor 30, instead of closing the flush valve 22, can move the
drive arm 32 in a direction such that the flush valve 22 rotates to
an open position.
[0026] As previously mentioned, once the flush mechanism 20 is
activated the flush/add water switch is momentarily activated, for
example for 0.5 seconds, thereby initially energizing the motor 30
and the water inlet valve. Initial rotation of the rotor cam 26,
however, activates a cam switch 44, which provides power to the
motor 30 and the water inlet valve after the flush/add water switch
is de-energized. Thus, once the user releases the actuating
mechanism 16 the cam switch 44 controls the motor 30 and the water
inlet valve thereby controlling the duration of the flush cycle.
Thus, after the user releases the actuating mechanism 16 the flush
valve 22 will remain open for a predetermined period of time which
is dependent on the rotation speed of the motor 30.
[0027] In the event that the spring 40 does not provide enough
initial force to rotate the flush valve 22 a power boost bar 46 may
be provided on the drive arm 32 to provide additional force to
rotate the flush valve 22. Referring to the embodiment shown in the
FIGS. 4-7, as the motor arm 38 rotates a projection 39 on the motor
arm 38 contacts the power boost bar 46 and forces it in the
direction indicated by the arrow 42, thus, providing additional
force to open the flush valve 22.
[0028] Referring to FIG. 7, an emergency flush rod 50 is provided
to provide a means to operate the toilet 10 in the event that
electrical power is lost or the motor 30 or actuating mechanism 16
are not operable. The flush rod 50 is mechanically attached to the
motor arm 38 such that when the user depresses the flush rod 50 the
motor arm 38 is disengaged from the drive arm slot 36. Once motor
arm 38 is disengaged the spring 40 biases the drive arm 32 in a
direction indicated by the arrow 42 thus opening the flush valve 22
as described above. The flush valve 22 will remain open until power
is restored to the toilet 10. Once power is restored the cam switch
44 will be activated and the flush cycle will complete its cycle as
described above. A return spring is provided to return the flush
rod 50 to its normal position after it has been released.
[0029] FIG. 8 shows a timing chart for operating the toilet in the
flush mode. The amount of time required for the toilet to compete
one flush cycle can be any time period required to provide an
adequate flush. For example, the cycle represented in FIG. 8 has a
timing cycle of 5 seconds.
[0030] When the user activates the actuating mechanism 16 in the
add water mode the water valve is energized to allow water to enter
the bowl. The amount of water permitted in the bowl can be
controlled manually or by water level switches.
[0031] In regard to vacuum toilets, the flush mechanism 20 further
includes an optional control feature that prevents the toilet from
flushing unless the vacuum is at a sufficient level to provide an
adequate flushing force.
[0032] While specific embodiments of the invention have been
described and illustrated, it is to be understood that these
embodiments are provided by way of example only and that the
invention is not to be construed as being limited thereto but only
by proper scope of the following claims.
* * * * *