U.S. patent number 3,811,394 [Application Number 05/237,456] was granted by the patent office on 1974-05-21 for control unit.
This patent grant is currently assigned to Unipas, Inc.. Invention is credited to Paul Anthony Lathers.
United States Patent |
3,811,394 |
Lathers |
May 21, 1974 |
**Please see images for:
( Certificate of Correction ) ** |
CONTROL UNIT
Abstract
A control unit with means to provide a positive connection
between a rudder and a power driving motor for automatic pilot
steering. The control unit is normally attached to a steering
means, such as a quandrant, which is keyed to a rudder post. The
control unit has rotatable means responsive to a shaft extending
from the power motor, including a sprocket which engages a detent
carried by a pivotal braking arm. The arm is movable between either
a release or set position. A solenoid having a plunger element is
provided which extends through the distal end of the arm to effect
movement of the braking arm into set position. Resilient means,
such as springs, surround the plunger on either side of the brake
arm and bias it either into set position when the solenoid is
activated or release position when inactivated. Provision is also
made for manual override of the automatic control. When the unit is
in set position, the reciprocating movement of the shaft from the
power motor will cause a corresponding movement of the quadrant
and, ultimately, the rudder. In release position, the movement of
the shaft will not affect the quadrant.
Inventors: |
Lathers; Paul Anthony (North
Scituate, RI) |
Assignee: |
Unipas, Inc. (Cranston,
RI)
|
Family
ID: |
22893801 |
Appl.
No.: |
05/237,456 |
Filed: |
March 23, 1972 |
Current U.S.
Class: |
114/144R |
Current CPC
Class: |
B63H
25/06 (20130101); B63H 25/34 (20130101); B63H
25/16 (20130101) |
Current International
Class: |
B63H
25/06 (20060101); B63H 25/34 (20060101); B63H
25/16 (20060101); B63h 025/34 () |
Field of
Search: |
;114/144A,144R
;244/77R,77V,77F ;74/388R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Buchler; Milton
Assistant Examiner: Frankfort; Charles E.
Claims
What is claimed is:
1. In a vessel having means for operating a rudder post, steering
means mounted on said post and positively connected to a manual
steering mechanism, actuator means pivotally attached to said
steering means, power driving means pivotally mounted on a support
laterally spaced from said steering means, and including shaft
means adapted at one end to laterally reciprocate into and out of
said power driving means and providing a positive connection at its
opposite end with said actuator means, said actuator means
including a releasable member adapted when held in set position to
render said connection operative and permit the operation of said
steering means independent of said manual steering mechanism, said
releasable member being yieldable in set position to an override
force from said manual steering mechanism.
2. The invention as identified in claim 1 wherein said steering
means is a quadrant.
3. The invention as defined in claim 2 wherein said actuator
further includes a rotatable means operable to maintain said
positive connection operative when held against rotation by said
releasable member.
4. The invention as defined in claim 3 wherein said actuator
includes electromagnetic means to effect relative movement of said
releasable member from a release position to a set position.
5. A convertible manual and automatic control unit adapted to
provide a positive connection between a steering means and a power
driving means laterally spaced from said steering means, comprising
a housing, mounting means to pivotally mounted said housing on said
steering means, rotatable means mounted in said housing, said
rotatable means including an element having a plurality of teeth
arranged in a circular series, said element being adapted when held
against rotation to maintain said connection and when permitted to
rotate to render said connection ineffectual, a braking member
adapted when held in set position to hold said element against
rotation, but movable to a release position, and electromagnetic
means including resilient elements to bias said braking member into
set position when activated and release position when
inactivated.
6. A control unit as defined in claim 5 wherein said braking member
is movable from a set position in response to an overriding torque
in said rotatable element.
7. A control unit as defined in claim 6 wherein said
electromagnetic means is a solenoid.
8. A convertible manual and automatic control unit adapted to
provide a positive connection between a steering means and a power
driving means laterally spaced from said steering means, comprising
a housing, mounting means adapted to pivotally mount said housing
on said steering means, a rotatable element having a plurality of
teeth arranged in a circular series mounted in said housing, said
element being adapted to mesh with one end of shaft means
reciprocally and laterally movable in said power driving means so
that when held against rotation said connection is maintained and
when permitted to rotate said connection is rendered ineffectual, a
braking member pivotally secured at one end to said housing and
movable between release and set position, a detent member carried
by said braking member and acting to hold said rotatable element
against rotation when in set position, electromagnetic means
secured in said housing to effect relative movement of said detent
from one of said release or set positions.
9. A control unit as defined in claim 8 wherein said
electromagnetic means includes a plunger movable in response to a
magnetic field generated in said electromagnetic means, and
resilient means surrounding said plunger and biasing said braking
member into one of said set or release positions in response to the
activation or inactivation of said magnetic field.
Description
BACKGROUND OF THE INVENTION
This invention relates to automatic pilots and more particularly to
a control unit for automatic pilot steering systems which is
adapted to provide for either manual or automatic operation of the
system. Automatic pilots have been known for years and have been
the subject of intensive development but the products resulting of
this development have been costly devices which are complex in
nature and generally inappropriate for use in small craft.
Installation of such automatic pilots is generally complicated and,
thus, impractical for widespread use. For example, in the usual
automatic control system a clutching arrangement is provided so
that the system may alternate between manual or automatic control.
While such an arrangement may provide effective control, its
placement in a small craft is costly and impractical. In other
systems a hook-up is provided between the manual steering mechanism
and the power apparatus control so that no clutching or
de-clutching is necessary. However, this hook-up is generally
fitted into a steering cable or rod which in certain instances may
be inconvenient to get to and also results in a costly
installation.
SUMMARY OF THE INVENTION
Accordingly, it is a particular object of this invention to provide
a control unit for an automatic pilot system which is simple in
design and may be conveniently installed in automatic pilot systems
for small craft.
It is another object of this invention to provide a control unit
for an automatic pilot steering system which may be activated for
sensitive reaction to small course changes and yet adapted to
override by a simple and convenient manipulation of manual steering
controls when required.
Other objects and embodiments will become apparent from the
following disclosure.
The invention comprises a control unit which allows either manual
or automatic control of a rudder. The unit comprises an actuator
means which is pivotally attached to a steering means mounted on a
post supporting the rudder. The steering means is positively
connected to a manual steering mechanism. Located within the
actuator means is a releasable member which when in set position,
through a connecting element, locks the actuator means and,
utimately, the steering means and rudder to a power driving means.
When the releasable member is in its inactive or released position,
the actuator means functions independant of the power means. Thus,
the steering means will respond only to the manual steering
mechanism. The actuator means is also adapted for over-ride of its
automatic function in set position by the manual steering mechanism
when so dictated by circumstances.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings illustrate the best mode presently contemplated for
carrying out the objects of the invention and are not to be
construed as restrictions or limitations on its scope. In the
drawings:
FIG. 1 is a side elevation of the control unit showing the actuator
with a portion of its housing cut away and embodied in connection
with a conventional reversible motor.
FIG. 2 is a top plan view of the system of FIG. 1 showing the motor
connecting element in its fully extended position.
FIG. 3 is a top plan view of the system of FIG. 1 showing the motor
connecting element in its fully retracted position.
FIG. 4 is a top plan view of the system of FIG. 1 wherein the
actuator moves independant of the reversible motor.
FIG. 5 is a fragmentary enlarged view of the actuator of FIG. 4
along lines 5--5 showing the releasable element in its released
position.
FIG. 6 is a fragmentary enlarged view of the actuator of FIG. 1
showing the releasable element in its override position.
FIG. 7 is a view along lines 7--7 of FIG. 6.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to FIG. 1, a quadrant 10 is keyed to a rudder post
11 so that its axis of swing is the center of the post. As seen
better in FIG. 2, the quadrant has an arcuate outer edge 12
provided with tracks 13 and 14 which receive cables 15 and 16. The
cables are each secured at one end at flange portions 18 and 19
respectively and connected at the other ends, either directly or
indirectly, to a manual steering mechanism, not shown. An actuator
unit, generally designated 20, is shown with a portion of its
housing 21 cut away. As seen in greater detail in FIGS. 5 and 6,
the actuator is pivotally supported on a pivot 22 at a point
intermediate bars 23 and 24 which are clamped together by any
convenient means such as the nut and bolt arrangement as shown in
FIG. 5. The pivot extends through the bars and a spacer 25 and is
secured by nut 26. Contained within the actuator housing is a
releasable member or brake arm 27, having stems 28 and 29 shown in
FIG. 7 which are pivotally supported at one end on a fixed axis by
pin 9, which is secured to the housing 21, and joined at the distal
ends by an aperatured spacer 30. A solenoid 31, mounted in the
bottom portion of the housing 21, has a plunger element 32
extending therefrom through the aperature in spacer 30. Attached to
the end of plunger 32 is a retainer disc 33. Compression springs 34
and 35 surround the plunger on either side of brake arm 27 and bias
the arm either away from the solenoid when it is inactivated as
viewed in FIG. 6, or away from the retainer disc 33 when activated.
At an intermediate point on arm 27 is a roller 36 which acts as a
detent when engaging the teeth of a sprocket 37. The sprocket is
mounted along with a pinion 38 (shown in phantom), on a shaft 39
which is secured to the side of the housing 21 as seen in FIG.
7.
In FIG. 1, a power driving unit 40 is shown pivotally mounted on
the underside of the stern portion of a vessel. The power unit
consists of a housing 41 containing a reversible motor, not shown,
and a shaft 42 which is driven by the motor through a gearing
mechanism, also not shown, in the base of the unit. The shaft 42
acts as a connecting element between the power unit and the
actuator and is adapted to be reciprocated into and out of the
power unit so as to adjust its position in accordance with a
predetermined signal from a direction sensing device which
energizes the motor. Formed at the outer portion of the shaft 42 is
a rack 43 which extends through an opening in the side of the
housing 21 and meshes with the pinion 38.
When automatic pilot steering is desired, the solenoid 31 is
activated from an external source whereupon an electromagnetic
field is produced which attracts the plunger 32 thereby forcing
compression of spring 34 which biases the brake arm 27 so that it
moves forward and compresses spring 35. As previously indicated,
this forward movement of the brake arm 27 causes the roller 36 to
engage the teeth of sprocket 37 and prevent its rotation. When so
engaged, by reason of the rack and pinion connection between the
power unit 40 and the actuator 20, any reciprocating motion of the
shaft 42 extending from the power motor will be transmitted to the
quadrant 10 and in turn the rudder. For manual operation the
solenoid is inactivated, again from an external source, whereupon
spring 35 will bias the brake arm away from the sprocket 37 which
will then be free to rotate unhindered by roller 36 as seen in FIG.
5. When the brake arm is in this position, the reciprocating motion
of the shaft 42 and its rack portion 43 will not be transmitted to
the quadrant as illustrated in FIG. 4.
In FIG. 2 the invention is illustrated in the condition for
automatic operation and the shaft 42 extends from the power driving
unit in its fully extended position. The quadrant 10 rotates about
the axis of the rudder pole in response to the reciprocating
movement of the shaft.
In FIG. 3 the shaft 42 is illustrated in its fully retracted
position causing a movement of the quadrant 10 opposite to that
illustrated in FIG. 2.
During operation of the automatic pilot it may occasionally be
necessary to take over manual control for a short time to perform a
dodging maneuver or for some other reason. As seen in FIG. 6 the
present invention is adapted to provide for such an override
feature. As previously indicated, when activated, the solenoid 31
attracts plunger 32 so that spring 34 is biased by retainer disc 33
against arm 27. Thus, force is created which presses the arm
forward so that roller 36 is sealed in one of the spaces between
the teeth on sprocket 37 and restrains it from rotation. However,
in response to a force exerted by the manual steering mechanism the
quadrant 10 may be rotated about its axis causing an overload
torque on sprocket 37 thereby unseating the roller in the brake arm
from its set position. The reverse force caused by the roller
overriding the teeth of the sprocket will cause slight backward
movement of the arm 27 so that spring 34 is further compressed.
When the overload torque is no longer present, spring 34 will force
brake arm 27 back into its set position thereby restraining
sprocket 37 against rotation and effecting automatic control once
more.
Of course, other variations of the specific construction and
arrangement of the control unit disclosed above can be made by
those skilled in the art without departing from the invention as
defined in the appended claims.
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