# US 5,350,327 A · Device to permit an outboard motor boat to operate in shallow water

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- Number: US 5,350,327 A
- Document ID: US5350327A
- Status: Granted
- Kind: A
- Application number: 08/107,897
- Filed: 1993-08-18
- Granted: 1994-09-27
- Earliest claimed: 1993-08-18
- Inventors: Robert W. Self; Karl Styron
- Web page: https://patentgrep.com/patent/US5350327A

## CPC

- B63H 20/10: Means enabling trim or tilt, or lifting of the propulsion element when an obstruction is hit; Control of trim or tilt
- B63B 39/061: {by using trimflaps, i.e. flaps mounted on the rear of a boat, e.g. speed boat}
- B63H 20/106: {Means enabling lifting of the propulsion element in a substantially vertical, linearly sliding movement}
- B63H 20/04: in a well
- B63H 20/34: comprising stabilising fins {, foils, anticavitation plates, splash plates, or rudders (rudders carrying propellers B63H25/42; rudders carrying jets B63H25/46)}
- B63H: MARINE PROPULSION OR STEERING (propulsion of air-cushion vehicles B60V1/14; specially adapted for submarines, other than nuclear propulsion, B63G; specially adapted for torpedoes F42B19/00)
- B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06)

## Abstract

A device for permitting an outboard motor boat to operate in shallow water, comprises a first support for securing to a transom of a boat and extending rearwardly therefrom; a keel secured to the first support and extending downwardly therefrom and rearwardly from the transom; a vertically adjustable motor mount for supporting an outboard motor with a propeller housing having a leading surface, the motor mount for positioning the motor in a raised position to permit the boat to operate in shallow water and a lowered position in normal-depth water; and the keel includes a rear edge substantially parallel and adjacent to the leading surface of the propeller housing when the motor mount is in the raised position.

## Claims

### Claim 1

A device for permitting a boat to operate in shallow water, comprising:
a) a bottom plate having front and rear ends, said bottom plate for pivotably connecting to a transom of a boat at said front end, said bottom plate having a bottom surface;
b) a motor mount having top and bottom ends, said motor mount bottom end being pivotably connected to said bottom plate rear end;
c) said motor mount being adapted to carry an outboard motor such that the propeller is disposed below said bottom plate, the propeller having a housing with leading surface;
d) first and second side plates for securing to the transom of the boat and transversely disposed respectively on each side of said bottom plate;
e) a keel secured to said bottom surface of said bottom plate, said keel having a lagging edge having a substantially complementary profile as the leading surface of the propeller housing; and
f) means for moving said bottom plate about said front end such that said keel lagging edge is disposed adjacent the propeller housing leading surface when said bottom plate is in a raised position for shallow water operation.

### Claim 2 (depends on 1)

A device as in claim 1, wherein:
a) said motor mount top end is adapted to move counter-clockwise away from the boat as said bottom plate pivots upwardly such that the axis of rotation of the propeller is disposed upwardly.

### Claim 3 (depends on 1)

A device as in claim 1, and further comprising:
a) first and second flanges secured to respective first and second side plates.

### Claim 4 (depends on 3)

A device as in claim 3, wherein:
a) said flanges include portions extending beyond said side plates; and
b) said portions have inner edges disposed outwardly away from said side plates.

### Claim 5 (depends on 1)

A device as in claim 1, and further comprising:
a) first and second flanges for pivotably securing to the transom.

### Claim 6 (depends on 1)

A device as in claim 1, wherein:
a) said moving means comprises a top bracket having a front end for pivotably connecting to the transom and a rear end pivotably connected to said motor mount top end; and
b) a turnbuckle diagonally secured across said bottom plate and said motor mount, whereby shortening or lengthening said turnbuckle raises or lowers said bottom plate, respectively.

### Claim 7 (depends on 1)

A device as in claim 1, wherein:
a) said bottom plate is disposed above the bottom surface of the boat when secured to the transom.

### Claim 8 (depends on 1)

A device as in claim 1, wherein:
a) said bottom plate is disposed substantially flush with the bottom surface of the boat when secured to the transom.

### Claim 9 (depends on 8)

A device as in claim 8, further comprising:
a) a transition sleeve between said bottom plate and the transom.

### Claim 10 (depends on 1)

A device as in claim 1, wherein:
a) said keel is tapered.

### Claim 11

A device for permitting an outboard motor boat to operate in shallow water, comprising:
a) a first support for securing to a transom of a boat and extending rearwardly therefrom;
b) a keel secured to said first support and extending downwardly therefrom and rearwardly from the transom;
c) a motor mount for supporting an outboard motor with a propeller housing having a leading surface, said motor mount for positioning the motor in a raised position to permit the boat to operate in shallow water;
d) said keel being substantially flat in cross-section and including a rear edge for being disposed adjacent the leading surface of the propeller housing when the motor is in said raised
e) said keel for being disposed in front of the axis of rotation of the propeller when the motor is in said raised position; and
f) said keel having a bottom edge adapted to divert debris away from the propeller during operation of the boat.

### Claim 12 (depends on 11)

A device as in claim 11, wherein:
a) said keel is tapered from narrow to wide in the direction away from the transom.

### Claim 13 (depends on 11)

A device as in claim 11, and further comprising:
a) first and second trim tabs disposed on each lateral side of said first support.

### Claim 14 (depends on 13)

A device as in claim 13, wherein:
a) said trim tabs are pivotably secured to the transom.

### Claim 15 (depends on 11)

A device as in claim 11, and further comprising:
a) second and third supports operably associated with said first support; and
b) said first support is disposed between said second and third supports.

### Claim 16 (depends on 15)

A device as in claim 15, wherein:
a) said motor mount is disposed between said second and third supports.

### Claim 17 (depends on 16)

A device as in claim 16, wherein:
a) said motor mount is selectively vertically adjustable between said second and third supports.

### Claim 18 (depends on 11)

A device as in claim 11, wherein:
a) said first support is disposed substantially flush with the bottom of the boat when secured to the transom.

### Claim 19 (depends on 11)

A device as in claim 11, wherein:
a) said first support is disposed a distance above the bottom of the boat when secured to the transom.

### Claim 20 (depends on 11)

A device as in claim 11, wherein:
a) said first support is pivotably adjacent the transom.

### Claim 21 (depends on 11)

A device as in claim 11, wherein:
a) said motor mount is vertically adjustable; and
b) said motor mount is operably associated with said first support such that raising and lowering of said motor mount causes said first support and said keel to extend toward and retract away from the motor, respectively.

### Claim 22 (depends on 11)

A device as in claim 11, and further comprising:
a) adjusting means for extending and retracting said first support relative to the transom.

### Claim 23 (depends on 22)

A device as in claim 22, wherein:
a) said adjusting means comprises second and third supports operably associated with said first support;
b) said first support is disposed between said second and third supports;
c) guides operably associated with respective second and third supports for slidingly securing said first support; and
d) a jack for selectively sliding said first support along said guides.

### Claim 24 (depends on 23)

A device as in claim 23, wherein:
a) said jack comprises a bolt and a nut operably associated with said first support and the transom such that turning said bolt causes said first support to move in said guides.

### Claim 25 (depends on 11)

A device as in claim 11, wherein:
a) said motor mount is vertically adjustable; and
b) linkage operably associated with said motor mount and said first support for automatically moving said first support as said motor mount is raised and lowered.

### Claim 26 (depends on 25)

A device as in claim 25, wherein:
a) said linkage includes a plurality of linkage members pivotably secured to each other such that upward and downward motion of said motor mount causes lateral motion of said first support.

### Claim 27 (depends on 11)

A device as in claim 11, wherein:
a) said motor mount is vertically adjustable;
b) said motor mount comprises a pair of channel guides and a mounting block disposed between said channel guides;
c) second and third supports secured to the transom and respective channel guides; and
d) a jack operably secured to said channel guides and said mounting block for raising and lowering said mounting block relative to said channel guides.

### Claim 28 (depends on 11)

A device as in claim 11, and further comprising:
a) removably secured shims disposed on top of said motor mount.

### Claim 29 (depends on 11)

A device as in claim 11, and further comprising:
a) first and second flanges disposed on each lateral side of said first support;
b) said flanges including portions extending beyond said first support; and
c) said portions have inner edges disposed outwardly away from said first support.

### Claim 30

A device for permitting a boat to operate in shallow water, comprising:
a) a bottom plate having front and rear ends, said bottom plate for connecting to a transom of a boat at said front end, said bottom plate having a bottom surface;
b) first and second side plates for securing to the transom of the boat and disposed respectively on each side of said bottom plate;
c) a motor mount being adapted to carry an outboard motor in a raised position to permit the boat to operate in shallow water, said mount being secured to said first and second side plates, the outboard motor having a propeller housing with a leading surface;
d) a tapered keel secured to said bottom surface of said bottom plate, said keel having a wide portion for being disposed adjacent the propeller housing and a narrow portion for being disposed near the transom; and
e) said wide portion having a rear edge for being disposed in front of the axis of rotation of the propeller such that debris encountered during operation of the boat is directed downwardly and away from the propeller.

### Claim 31 (depends on 30)

A device as in claim 30, wherein:
a) said rear edge is substantially parallel to the leading surface of the propeller housing.

### Claim 32

A boat for operating in shallow water, comprising:
a) a stern portion including a cut-out having front and opposed side walls;
b) a first support disposed within said cut-out;
c) a keel secured to said first support and extending downwardly therefrom;
d) a motor mount for supporting an outboard motor with a propeller housing having a leading surface, said motor mount for positioning the motor in a raised position to permit the boat to operate in shallow water; and
e) said keel including a rear edge for being disposed adjacent the leading surface of the propeller housing and in front of the axis of rotation of the propeller when the motor is in said raised position.

### Claim 33 (depends on 32)

A boat as in claim 32, wherein:
a) said first support is a plate having a front end pivotably connected to said front wall, said plate having a rear end and a bottom surface.

### Claim 34 (depends on 33)

A boat as in claim 33, wherein:
a) said motor mount includes a bottom end pivotably secured to said bottom plate rear end; and
b) means operably associated with said motor mount and said bottom plate for pivoting said bottom plate such that said bottom plate and said keel are raised when said motor mount is raised for shallow water operation.

### Claim 35 (depends on 32)

A boat as in claim 32, wherein:
a) said first support is slidably secured between said side walls.

### Claim 36 (depends on 32)

A boat as in claim 32, wherein:
a) said first support is disposed above the bottom surface of the boat.

### Claim 37

A device for permitting an outboard motor boat to operate in shallow water, comprising:
a) a frame for securing to a transom of a boat and including a portion extending rearwardly from the transom;
b) said frame including a motor mount for supporting an outboard motor at a distance away from the transom, said motor mount for positioning the motor in a raised position to permit the boat to operate in shallow water; and
c) first and second horizontally pivotable trim tabs secured to said frame and disposed on each lateral side of said frame portion, respectively, such that water is directed inwardly toward said frame portion and the propeller during operation of the boat.

### Claim 38 (depends on 37)

A device as in claim 37, wherein:
a) said frame portion includes a first support disposed a distance above the bottom of the boat when said frame is secured to the transom.

### Claim 39 (depends on 37)

A device as in claim 37, and further comprising:
a) a keel secured to said frame portion and extending downwardly therefrom and rearwardly from the transom.

### Claim 40 (depends on 39)

A device as in claim 39, wherein:
a) said keel is substantially flat in cross-section and includes a rear edge for being disposed adjacent the leading surface of the propeller housing when the motor is in said raised position; and
b) said keel for being disposed in front of the axis of rotation of the propeller; and
c) said keel includes a bottom edge adapted to divert debris away from the propeller during operation of the boat.

### Claim 41 (depends on 39)

A device as in claim 39, wherein:
a) said keel is tapered.