U.S. patent number 3,842,777 [Application Number 05/273,331] was granted by the patent office on 1974-10-22 for marine vessel roll stabilizer apparatus.
Invention is credited to Everett P. Larsh.
United States Patent |
3,842,777 |
Larsh |
October 22, 1974 |
MARINE VESSEL ROLL STABILIZER APPARATUS
Abstract
Anti-roll apparatus for a marine vessel. A plurality of fins are
carried by the vessel. Each fin is operatively moved by motor
mechanism which is connected thereto by means of clutch mechanism.
The motor mechanism is in continuous operation. A roll sensor unit
is mounted in a position to detect roll motion of the vessel. The
roll sensor unit transmits signals to the clutch mechanism in
response to roll motion of the vessel. The clutch mechanism joins
the motor mechanism to the fins for movement thereof in accordance
with operation of the roll sensor unit. The fins are thus
operatively moved to reduce and/or eliminate the roll action of the
vessel.
Inventors: |
Larsh; Everett P. (Miami,
FL) |
Family
ID: |
26761775 |
Appl.
No.: |
05/273,331 |
Filed: |
July 19, 1972 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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79240 |
Oct 8, 1970 |
3687100 |
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Current U.S.
Class: |
114/126 |
Current CPC
Class: |
B63B
39/06 (20130101) |
Current International
Class: |
B63B
39/00 (20060101); B63B 39/06 (20060101); B63b
039/06 () |
Field of
Search: |
;114/121,122,124,126
;74/567,568T |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Blix; Trygve M.
Assistant Examiner: Goldstein; Stuart M.
Attorney, Agent or Firm: Jacox & Meckstroth
Parent Case Text
RELATED APPLICATION
This application is a continuation-in-part of my co-pending Patent
Application Ser. No. 79,240, filed Oct. 8, 1970, now U.S. Pat. No.
3,687,100.
Claims
The invention having thus been described, the following is
claimed:
1. Marine vessel roll stabilizer apparatus comprising:
a fin member carried by the vessel and pivotally movable with
respect thereto,
a first rotary motor and a second rotary motor, each of the rotary
motors being adapted to be in continuous operation,
a first electrically operable clutch member,
a second electrically operable clutch member,
means connecting the first clutch member to the fin member for
pivotal movement thereof, means connecting the second clutch member
to the fin member for pivotal movement thereof,
the first motor being connected to the first clutch member,
the second motor being connected to the second clutch member,
the motors operating in opposed directions of rotation so that when
the first clutch means is energized the fin member pivotally moves
in one direction and when the second clutch means is energized the
fin member pivotally moves in the opposite direction,
roll sensor means carried by the vessel and operable with roll
movement of the vessel,
means joining the roll sensor means to the clutch members for
operation thereof with roll movement of the vessel,
the roll sensor means comprising control mechanism, which includes
a pendulum,
first switch means, actuator means, for operation of the switch
means,
means joining the actuator means to the pendulum, for operation of
the first switch means with relative rotative movement between the
pendulum and the vessel,
second switch means,
means for operation of the second switch means with pivotal
movement of the fin member.
2. The apparatus of claim 1 which includes support structure for
fixed attachment to a marine vessel, a shaft rotatably supported by
the support structure, the pendulum being attached to the shaft for
rotative movement therewith, a leg member pivotally supported by
the shaft, a dampener member connected to the leg member, a roller
member rotatably attached to the pendulum and in engagement with
the dampener member, the dampener member being pivotally movable to
adjust the dampener member to compensate for any list of the marine
vessel.
3. The apparatus of claim 1 which includes support structure, a
shaft rotatably supported by the support structure, means attaching
the pendulum to the shaft for pivotal movement of the shaft with
pivotal movement of the pendulum, and means for dampening relative
rotative movement between the pendulum and the support structure,
the means for dampening relative rotative movement between the
pendulum and the support structure comprising an engagement member
having an arcuate surface, and engagement means carried by the
pendulum and in engagement with the arcuate surface.
4. The apparatus of claim 3 in which the engagement member is
pivotally movable and which includes resilient means which resist
pivotal movement of the engagement member.
5. The apparatus of claim 4 which includes means adjustably
supporting the engagement member with respect to the support
structure.
6. The apparatus of claim 3 in which the engagement means comprises
a roller member.
7. In marine vessel roll stabilizer apparatus, a fin member carried
by the vessel for movement with respect thereto, motor means,
clutch means joining the motor means to the fin member for movement
thereof, electric control means for control of the clutch means,
the electric control means including first switch means, the first
switch means being pendulum operated switch means, second switch
means, means connecting the second switch means to the fin member
for sensing the position thereof with respect to the vessel, the
switch means including means for positioning the fin member in a
given position during absence of roll of the vessel.
8. The apparatus of claim 7 which includes a pendulum, the first
switch means including a pair of spaced-apart switch members, an
actuator member, means pivotally connecting the actuator member to
the pendulum, the actuator member having a portion positioned
between the switch members for operation thereof, cam means, means
connecting the cam means to the fin member for movement therewith,
the second switch means being operable by the cam means, and
circuit means connecting the clutch means to the first switch means
and to the second switch means for operation of the clutch means
with operation of the switch means.
9. Marine vessel roll stabilizer apparatus comprising:
fin means movable with respect to the vessel for stabilizing
thereof.
Continuously operating rotary motor means,
electric clutch means joining the fin means to the motor means,
roll sensor means, the roll sensor means including first roll
sensor switch means, the first roll sensor switch means closing
when the vessel rolls toward the starboard side, second roll sensor
switch means, the second roll sensor switch means closing when the
vessel rolls toward the port side,
a source of electrical energy,
means joining the source of electrical energy to the first roll
sensor switch means and to the clutch means for operation of the
fin means in a direction to oppose roll of the vessel toward the
starboard side,
means joining the source of electrical energy to the second roll
sensor switch means and to the clutch means for operation of the
fin means in a direction to oppose roll of the vessel toward the
port side,
the roll sensor means including means closing the first roll sensor
switch means when the vessel rolls toward the starboard side, and
opening the first roll sensor switch means when the vessel stops
roll toward the starboard side and begins roll toward the port
side, and closing the second roll sensor switch means when the
vessel begins rolling toward the port side and before the vessel
reaches a level position, so that the fin means begins to operate
in a direction to oppose roll of the vessel to the port side prior
to roll of the vessel from a level position to the port side,
third switch means, the third switch means sensing the position of
the fin means with respect to the vessel,
means joining the source of electrical energy to the clutch means
and to the third switch means for operation of the fin means in
accordance with the position thereof with respect to the
vessel.
10. The apparatus of claim 9 in which the roll sensor means
includes a pendulum, spring-biased actuator means for operation of
the first roll sensor switch means and the second roll sensor
switch means, support structure, means pivotally connecting the
actuator means to the pendulum for pivotal movement of the actuator
means about a first axis, and means pivotally connecting the
actuator means to the support structure for pivotal movement of the
actuator means about another axis.
11. The apparatus of claim 9 in which the roll sensor means
includes a pendulum, shaft means supporting the pendulum for
rotative movement therewith, means for securing the shaft against
rotative movement and for simultaneously disconnecting the switch
means and the clutch means from the source of electrical
energy.
12. The apparatus of claim 9 in which the roll sensor means
includes a shaft, a pendulum supported by the shaft for pivotal
movement about the axis of the shaft, a dampener member, the
dampener member including a portion having an arcuate surface, a
roller member attached to the pendulum and movable upon the arcuate
surface, the radius of the arcuate surface being less than the
distance from the shaft to the arcuate surface so that forces
between the pendulum and the dampener member change as the roller
moves along the arcuate surface.
13. The apparatus of claim 12 in which the dampener member is
pivotally movable and which includes resilient means restraining
pivotal movement of the dampener member.
14. The apparatus of claim 12 which includes support means joining
the dampener member to the shaft for support of the dampener member
by the shaft.
15. The apparatus of claim 14 which includes means for adjusting
the support means to compensate for a list condition of the
vessel.
16. The apparatus of claim 1 in which the control mechanism
includes a dampener member having an arcuate surface, a roller
member rotatably attached to the pendulum and rotatably movable
upon the arcuate surface, the dampener member being pivotally
movable and the arcuate surface thereof forming an arc having a
radius less than the spacing between the pivotal axis of the
pendulum and the arcuate surface.
Description
BACKGROUND OF THE INVENTION
Numerous marine vessels have been provided with apparatus to reduce
or to overcome roll action of the vessel. Some of the apparatus has
included gyroscope devices which are usually rather expensive
and/or difficult to maintain in proper operating condition. Some of
the anti-roll apparatus has included valves, or pistons, or the
like, which lack speed and accuracy of operation. Some of the
anti-roll apparatus has included means for controlling operation of
motors directly in response to roll action of the vessel. Such
systems are usually slow and/or inaccurate in response.
It is therefore an object of this invention to provide marine
vessel anti-roll apparatus which does not require the use of
gyroscopes or the like.
It is another object of this invention to provide such apparatus
which has a minimum number of moving parts.
It is another object of this invention to provide such apparatus
which has very rapid response to roll action so that roll action
can be readily prevented or reduced.
Another object of this invention is to provide such apparatus which
functions properly even if the vessel controlled is listing.
Another object of this invention is to provide such apparatus which
includes means for testing thereof when the vessel is not rolling,
to insure that the apparatus is functioning properly or will
function properly.
Another object of this invention is to provide such apparatus which
is capable of sensing and controlling relatively low degrees of
roll and which is also capable of sensing and controlling
relatively high degrees of roll.
Another object of this invention is to provide such apparatus which
is basically electrical-mechanical in operation, which is
relatively simple in construction and which does not include any
devices of the "electronic" type.
Another object of this invention is to provide such apparatus which
does not include fluid conduits, valves, pistons, pumps, or the
like.
Another object of this invention is to provide such apparatus which
rapidly operates in response to roll action for correction action,
and which is capable of anticipating roll action but which does not
"over correct."
Other objects and advantages reside in the construction of parts,
the combination thereof, the method of manufacture, and the mode of
operation, as will become more apparent from the following
description.
BRIEF DESCRIPTION OF THE VIEWS OF THE DRAWINGS
FIG. 1 is a diagrammatic perspective view showing a marine vessel
provided with apparatus of this invention.
FIG. 2 is a perspective exploded view of roll sensor mechanism of
this invention.
FIG. 3 is a front view, with parts shown in sections, of the roll
sensor mechanism of FIG. 2.
FIG. 4 is a sectional view taken substantially on line 4--4 of FIG.
3.
FIG. 5 is a front elevational diagrammatic type of view showing a
position of operation of roll sensor mechanism of this
invention.
FIG. 6 is a front elevational diagrammatic type of view, similar to
FIG. 5, showing further operation of roll sensor mechanism of this
invention.
FIG. 7 is a front elevational diagrammatic type of view, drawn on a
smaller scale than the other views, illustrating the list
adjustment mechanism of the roll sensor mechanism of this
invention.
FIG. 8 is a fragmentary elevational view, taken substantially on
line 8--8 of FIG. 4.
FIG. 9 is a perspective diagrammatic type of view showing a portion
of the electrical and mechanical elements of this invention.
FIG. 10 is a diagrammatic type of view showing a portion of the
control mechanism of this invention.
FIG. 11 is a diagrammatic view of electrical circuitry of this
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 illustrates a marine vessel 20 and shows the general
location of a sensing unit 22, and stabilizer fins 24 and 26. FIG.
9 shows motors 28 and 30 for operation of the fin 26 and motors 32
and 34 for operation of the fin 24. FIG. 9 also shows a clutch 38,
which joins the motor 28 to a gear assembly 39, and a clutch 40
which joins the motor 30 to the gear assembly 39. A shaft 42 is
rotatably supported by any suitable means, not shown, and joins the
gear assembly 39 to the fin 26. The motor 32 is joined by a clutch
44 to a gear assembly 46, and the motor 34 is joined by a clutch 48
to the gear assembly 46. A shaft 49 is rotatably supported by any
suitable means, not shown, and joins the gear assembly 46 to the
fin 24.
The sensor unit 22 comprises a housing 50, shown in FIGS. 2, 3, and
4, which, as shown in FIG. 4, is rigidly attached to a portion of
support structure 53 of the vessel 20 by means of bolts 52. The
housing 50 of the sensor unit 22 is preferably located in or
adjacent a control station 54 of the vessel 20, as illustrated in
FIG. 1.
The housing 50 comprises a base plate 51 and a cover member 55.
Secured to the base plate 51 is a bracket member 56 which has
spaced-apart aligned bearing support portions 57 and 58. Within the
bearing support portion 57 is a bearing 60, and within the bearing
support portion 58 is a bearing 62. A shaft 64 is rotatably
supported by the bearings 60 and 62. A pendulum 63 is attached to
the shaft 64 and comprises spaced-apart stems 65 and 66, which are
carried by the shaft 64, and a weight member 67. The stem 65 has a
frictional disc 68 secured thereto, and the stem 66 has a
frictional disc 70 secured thereto. A pin 74 extends through a
portion of the disc 68 and into the shaft 64 so that the stem 65 is
non-rotatably attached to the shaft 64. A weight member 67 is
attached to the stems 65 and 66 at the lower ends thereof.
Rotatably mounted upon the shaft 64 and disposed between the
frictional discs 68 and 70 is a connector member 80.
A leg member 84 and a leg member 86 are also pivotally supported on
the shaft 64. The lower ends of the legs 84 and 86 have a pedestal
90 attached thereto by any suitable means, such as by means of
screws 92. The pedestal 90 supports a dampener member 94 which is
provided with an arcuate groove 96. A pin 97 pivotally attaches the
dampener member 94 to the pedestal 90. Rotatably movable upon the
floor of the groove 96 of the dampener member 94 is a roller 100
which is rotatably attached to the weight member 67 by means of a
pin 102. The arc of the groove 96 has a lesser radius than the
distance from the bottom of the roller 100 to the shaft 64.
Therefore, when there is relative movement between the dampener
member 94 and the pendulum 63, the roller 100 urges the dampener
member 94 to pivotally move. A pair of resilient members 104 are
disposed between the dampener member 94 and the pedestal 90 and
urge the dampener member 94 to maintain a symmetrical position with
respect to the pedestal 90.
Above the shaft 64 the leg member 84 supports a liquid level member
106 which is attached to the upper part of the leg member 84 by
suitable means, such as screws 108. A window 109 in the front
portion of the cover 55, permits a view of the liquid level member
106.
The upper portion of the leg 86 supports switch members 110, 112,
114, and 116, each of which has an actuator stem 120 extending
therefrom. The switch members are arranged so that the switch
members 110 and 112 are in juxtaposition one with the other and
spaced from the switch members 114 and 116, which are also in
juxtaposition. Positioned between the pairs of switch members 110
and 112, and 114 and 116 is an actuator member 124. The actuator
member 124 is pivotally attached to a shaft 126 which extends into
the actuator member 124 and which also extends into the upper
portion of the connector member 80. The actuator member 124 is also
pivotally connected to the upper portion of the leg 86 by means of
a pin 130 which extends into the actuator member 124 above the
shaft 126 and which also is secured within an opening 132 which is
located immediately above the shaft 64 in the leg 86. A leaf spring
134 is attached to the pin 130 and is positioned within the
actuator member 124 for urging axial alignment of the actuator
member 124 with the connector member 80.
The shaft 64 extends through the cover 55 and has attached thereto
a handle 136. The handle 136 has a notch 138 in the lower portion
thereof into which a toggle 140 of a switch 142 is movable. When
the handle 136 is positioned as shown in FIG. 8, the toggle 140 may
be pivotally moved upwardly so that a portion of the toggle 140 is
positioned within the notch 138 to prevent rotative movement of the
handle 136.
A block 143 is attached to the base plate 51 adjacent the leg 84
and carries a rod 145 which is axially movable with respect thereto
and which is urged by a spring 146 into engagement with the left
side of the leg 84, as shown in FIGS. 3 and 7. On the right hand
side of the leg 84 is a rod 148 which is threadedly supported by a
flange 150 at the edge of the base plate 51. The rod 148 is also
threadedly attached to a block 152 which is attached to the base
plate 51. The rod 148 is engageable with the right hand side of the
leg 84, as shown in FIGS. 3 and 7.
The shaft 49, which operates the fin 24, has a cam 160 attached
thereto for rotation therewith. Adjacent the cam 160, for operation
thereby, are switches 162, 164, 166, 168, and 170. The shaft 42,
which operates the fin 26, has a cam 180 attached thereto for
rotation therewith. Adjacent the cam 180 for operation thereby are
switches 182, 184, 186, 188, and 190.
FIG. 11 shows diagrammatically the electrical circuitry of this
invention, including the switches discussed above which are
operated by the cams 160 and 180. Also shown in FIG. 11 are the
electrical portions of the clutches 38, 40, 44, and 48 which
operate to cause rotative movement of the fins 26 and 24. Also
shown in FIG. 11 are contacts of the switches 110, 112, 114, and
116 which operate by engagement with the actuator member 124. Also
shown in FIG. 11 are lamps 210, 212, 214, 230, 232, and 234, which
indicate the rotative position of the fins 24 and 26. These lamps
may be located at any suitable positions adjacent the housing 50 or
may be mounted upon the cover member 55 of the housing 50.
OPERATION
While the vessel 20 is tied up at dock or is otherwise
substantially stationary, level member 106 is adjusted to level
position as illustrated in FIGS. 7 and 8. Such adjustment is made
by rotatively or threadedly moving the rod 148, which is in
engagement with the right hand side of the leg 84. The leg members
84 and 86 are attached together through the pedestal 90, and the
pedestal 90 pivotally supports the dampener member 94. Adjustment
of the rod 148 thus pivotally moves the legs 84 and 86 about the
shaft 64. Such adjustment is made until the liquid level member 106
is level as it appears through the window 109. When the liquid
level member 106 shows a level position, the legs 84 and 86 are
vertical, regardless of the angular position of the vessel 20. For
example, as illustrated in FIG. 6, the vessel 20 may be in a
starboard list condition when the liquid level member 106 is
adjusted to a level position. It is to be observed that such an
adjustment of the liquid level device 106 moves the leg members 84
and 86 which carry therewith the pedestal 90 and the dampener
member 94. Thus, the entire roll sensing mechanism is adjusted by
adjustment of the rod 148, as the pendulum 63 and the weight member
67 remain in a substantially vertical position.
However, as discussed above, the shaft 64 is attached to the handle
136, and the stems 65 and 66 of the pendulum 63 are attached to the
shaft 64 for rotative movement therewith. When the toggle 140 of
the switch 142 is in an upward position, and the handle 136 is in
alignment therewith, the toggle 140 is disposed in the notch 138 of
the handle 136. Thus, the toggle 140 prevents pivotal movement of
the handle 136 when the toggle 140 is in an upward position. When
the toggle 140 is in the upward position, the switch 142 is in an
off position or open position.
Because the handle 136 is attached to the shaft 64 and because the
shaft 64 is attached to the pendulum 63, when the toggle 140 is in
its downward position the handle 136 can be pivotally moved. Such
pivotal movement of the handle 136 causes pivotal movement of the
shaft 64 and the pendulum 63. Pivotal movement of the pendulum 63
causes operation of the switches 110, 112, 114, and 116. Thus, the
operation of the roll sensor mechanism can be tested when desired,
without roll movement of the vessel 20.
The switch 142 is preferably a double-pole single-throw switch and
is positioned within main control conductor members 250 and 252 of
the electrical control circuitry of the invention. Therefore, when
the switch 142 is in an open position, the circuitry shown in FIG.
11 is de-energized. Furthermore, when the toggle 140 of the switch
142 is in the raised position, the shaft 64 is secured against
rotation, because the handle 136 is secured against rotative
movement, the pendulum 63 is secured in position. Thus, when the
toggle 140 of the switch 142 is in an upward position, the pendulum
63 is mechanically restrained from movement, and the roll sensor
mechanism is inoperative.
The motors 28, 30, 32, and 34 are continuously rotating, as they
are energized from any suitable source of electrical energy.
However, the clutches 38, 40, 44, 48 are normally deenergized, and
the shafts 42 and 49 and the fins 26 and 24, respectively, are
normally maintained in neutral position. Thus, in order to energize
the control circuitry of this invention, shown in FIG. 2, the
toggle 140 of the switch 142 is moved to its lowermost position, as
illustrated in FIG. 8. When the toggle 140 is so positioned, the
switch 142 is closed and the conductors 250 and 252 shown in FIGS.
9 and 11 are energized.
Thus, as the marine vessel 20 is moving, the control circuitry of
FIG. 11 and the roll sensor mechanism of FIGS. 2, 3, 4, 5, 6, and 7
are in condition to operate. The lamps 212 and 232 are energized
and lighted through the switches 166 and 186, respectively. If the
marine vessel 20 should roll to the starboard, a condition exists
as illustrated in FIG. 5. In this condition there is relative
rotative movement between the pendulum 63 and the base plate 51.
Because there is frictional engagement between the connector 80 and
the stems 65 and 66, the connector 80 normally remains aligned with
the stems 65 and 66, as shown in FIG. 5. However, with starboard
roll of the vessel 20, there is pivotal movement of the actuator
member 124 about the axis of the pin 130. Thus, the actuator member
124 pivotally moves into engagement with the switches 114 and 116,
as shown in FIG. 5. Thus, the switches 114 and 116 are actuated.
Actuation of the switch 114 causes closing of the contacts 114A and
opening of the contacts 114B of the switch 114. When the contacts
114A are closed, a circuit is established from the conductor 250,
through the contacts 114A to the clutch 38. The contacts 184B of
the switch 184 are normally open but due to the fact that the cam
180 is in engagement with the switch 184 at this time, the contacts
184B are closed.
Thus, the clutch 38 is energized, and through the gear assembly 39,
the shaft 42 is rotatively moved, and the fin 26 is rotatively
moved in a direction to tend to overcome the roll of the vessel 20
to the starboard. For example, the shaft 42 and the cam 180, as
shown in FIG. 10, rotatively move clockwise. When this occurs, the
switch 186 which is normally in a recess 260 of the cam 180 is
engaged by the cam 180 and the switch 186 opens and a circuit
through the switch 186 is broken. Thus, the lamp 232 which is
normally energized and lighted, to indicate neutral position of the
fin 26, is opened and the lamp 232 is deenergized. At the same time
the cam 180 engages the switch 182 and the switch 182 is thus
closed.
If the vessel 20 continues its starboard roll, there is further
relative movement between the pendulum 63 and the base plate 51.
Thus, there is further movement of the actuator member 124 with
respect to the pendulum 63. Due to the fact that the connector 80
is frictionally but slidably retained between the stems 65 and 66
of the pendulum 63, there is relative rotative movement between the
connector 80 and the stems 65 and 66, as illustrated in FIG. 6.
During the relative rotative movement between the pendulum 63 and
the base plate 51 during roll movement of the vessel 20, there is
relative movement between the roller 100 and the dampener member
94, as illustrated in FIGS. 5 and 6. Due to the fact that the arc
of curvature of the groove 96 is less than the distance from the
shaft 64 to the bottom of the roller 100, pressure is exerted upon
the dampener member 94 as relative rotative movement between the
pendulum 63 and the base plate 51 occurs. This pressure increases
as relative movement toward the position shown in FIG. 6 occurs.
This pressure is absorbed by the resilient members 104. Thus,
dampening action occurs with regard to relative movement between
the base plate 51 and the pendulum 63 as roll of the vessel 20
occurs.
As the fin 26 rotatively moves, the cam 180 is rotatively moved,
because the fin 26 and the cam 180 are both rotatively moved with
rotative movement of the shaft 42. When the cam 180 has rotatively
moved to a given degree from its neutral position, for example to a
30 degree position, the recess 260 of the cam 180 is aligned with
the switch 184 and the switch 184 is operated so that the
normally-open contact 184B is opened. Thus, the clutch 38 is
deenergized and the shaft 42 and the fin 26 cease to rotatively
move. At the same time, the normally closed contact 184A is closed,
and the lamp 234 is lighted to indicate that the fin 26 has
rotatively moved to its maximum rotative position.
When the vessel 20 ceases its starboard roll and commences to roll
back toward the port side, the actuator member 124 disengages the
actuator stems 120 of the switches 114 and 116, and the actuator
member 124 engages the stems 120 of the switches 110 and 112. Thus,
the normally-open contacts 114A open and the normally-closed
contacts 114B close. Due to the fact that the switch 182 was
previously closed when the shaft 42 began rotative clockwise
movement, and due to the fact that the contacts 188B are closed by
the cam 180, a circuit is established through the clutch 40 for
energization thereof. Thus, the shaft 42 and the fin 26 immediately
begin rotative movement in the counterclockwise direction. Thus,
the fin 26 rotatively moves toward a position to oppose port roll
of the vessel 20 during the time the vessel 20 is rolling from the
starboard side toward the port side. Thus, when the vessel 20 rolls
from a starboard angle to a port angle, the fin 26 is already
prepared to oppose port roll of the vessel 20.
However, prior to assuming a position to overcome roll of the
vessel 20 to the port, the fin 26 moves to its neutral position
shown in FIG. 10 and the switch 186 again moves into the recess 260
of the cam 180 and closes, lighting the lamp 232, indicating
neutral position of the fin 26. Also, when the fin 26 rotatively
moves to its neutral position, the switch 182 is disengaged from
the cam 180 and opens, deenergizing the clutch 40. The clutch 40 is
not again energized unless the vessel 20 continues its roll toward
the port side, and if such port roll occurs, the actuator 124
engages the switches 110 and 112 and causes operation thereof.
Thus, the contacts 110B and the contacts 112B are closed.
It is to be understood that during operation of the fin 26 as
described above, the same operation is occurring with regard to the
fin 24, as a result of the operation of the circuitry shown in FIG.
11. Thus, when port roll occurs, the clutches 40 and 48 are
energized, causing rotative movement of the fins 26 and 24 in a
direction to oppose port side roll of the vessel 20. Thus, during
roll to the port side, operation of the circuitry of FIG. 11 and
operation of the fins 26 and 24, and operation of the cams 180 and
160 and the switches operated thereby occur in a manner similar to
that stated above with respect to starboard roll of the vessel
20.
If there is no roll of the vessel 20, the fins 24 and 26 are
maintained in a neutral position by the circuitry of FIG. 11.
Thus it is understood that the stabilizer apparatus of this
invention provides means by which roll movement of the vessel 20 is
quickly and effectively opposed.
Other objects and advantages reside in the construction of parts,
the combination thereof, the method of manufacture, and the mode of
operation, as will become more apparent from the following
description.
* * * * *