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Publication numberUS3075490 A
Publication typeGrant
Publication dateJan 29, 1963
Filing dateNov 19, 1959
Priority dateNov 19, 1959
Publication numberUS 3075490 A, US 3075490A, US-A-3075490, US3075490 A, US3075490A
InventorsLang Thomas G
Original AssigneeLang Thomas G
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mounting means for boat propulsion
US 3075490 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Jan.'29; 1963 T. G. LANG I 7 MOUNTING MEANS FOR BOAT PROPULSION Filed Nov. 19, 1959 2 Sheets-Sheet 1 (ammo THOMAS G. LANG,


Attorn ys ll MM HERZIG 8: J'ESSUP Jan. 29, 1963 'r. s. LANG 3,075,490



HERZIG 8: JESSUP, Attorneys ZJWT 9 4 State 3 075,420 MOUNTING MEAN FOR BOAT PROPULSION Thomas G. Lang, Arcadia, Calif. (1777 Grevelia St., Apt. J, South Pasadena, Calif.) Filed Nov. 19, 1959, Ser. No. 854,103 4 Claims. (Cl. 115-41) tion so the propeller remains submerged after the boat matically raises the motor when the boat stops in order rises above the water on its hydrofoils and which autoto protect the motor from waves.

Another object is to provide means for automatically Other objects are to provide an exterior mounting for an outboard motor to enable a higher transom to be used on a boat, to provide more room in the boat, to provide more quiet operation of the motor, and to eliminate gas and oil leakage from the motor.

Another object is to automatically tilt the propeller shaft at the lower motor speeds so the propeller operates less efiiciently, thereby permitting slower trolling speeds for fishing.

Another object is to provide means for adjusting the lowest operating position of the propeller for most efiicient high speed operation.

Another object is to provide a mounting means for an outboard motor which can be easily attached to a boat transom and which can be economically manufactured.

Other objects and advantages of the invention will be apparent from the following description.

In the accompanying drawings, forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same:

FIGURE 1 is a perspective view of a mounting for an outboard motor attached to the transom of a boat.

FIGURE 2 is a side elevation of the motor mount including the outboard motor illustrating the upper position thereof.

FIGURE 3 is atsectional view of a biasing means combined withadjustable stops and a shock absorber.

FIGURE 4 is a side elevation of an alternate construction of the motor mount.

FIGURE 5 is a side elevation of a hydrofoil boat equipped with the means of this invention and with an outboard motor, illustrating the lower, operating position.

FIGURE 6 is a perspective view of the deflection plate shown in FIGURES 1 and 2.

Referring more particularly to the drawings, the numeral 2 refers to a support member which is adapted to have an outboard motor mounted thereto and consisting of a pair of triangular brackets 2a spanned by a transverse board 2b. Member 2 is pivotally mounted to brackets 3 by means of pivot bolts 4 in such a manner that it is free to pivot about a pivot axis joining pivot bolts 4. Brackets 3 are attachable to boat transom 6 by suitable means as bolts 3a that hold the brackets rigidly to the transom. The lower pivotal position of the support member 2 is limited by a lower stop means such as the nuts 7 which contact a truss of the brackets 2a. Nuts 7 are screwed on eye bolts 8 in such a manner that their position is adjustable. The eyes of the eye bolts 8 are pivotally attached to brackets 3 by bolts 9, and the arms of the eye bolts freely pass through holes 11 in the trusses of brackets 2a. Other means could be used to limit the lower position of the support member 2 such as cables 26 (FIG. 4) attached between points 9 and 11.

Tension springs 12 are shown attached between the upper part of support member 2 and the upper part of brackets 3 in order to bias support member 2 pivotally toward an upper position. The tension in springs 12 decreases as the support member 2 pivots upward, such that when an outboard motor is attached to support member 2 an upper equilibrium position is reached where the spring 2. The propeller 13 of outboard motor 14 exerts a thrust along its axis 10 which passes below pivot bolts 4. This produces a new moment about pivot bolts 4 which tends to pivot support member 2 downward until springs 12 stretch sufiiciently so their tension is increased to balance the thrust or until support member 2 contacts lower stops 7. The position of the support member in the latter I case is shown in FIGURE 5. In practice, the spring bias will normally be designed such that the support member will rest in its lower position for medium to high values of propeller thrust and move upward only when the thrust is small or zero. In this manner the boat.

In some cases it may be found convenient to limit 1 the upper position of pivoting of support member 2 by an upper stop means such as nuts 16 screwed on eye bolts 8. creased such that support member 2 will remain fixed in an upper position resting against nut 16 until a certain minimum thrust is exceeded and with slight increased thrust will then rest against the lower stop nuts 7, thereby providing effectively only an upper-and a lower position of the motor and propeller, the lower position corresponding to higher speed operation.

It will be seen that the motor mount of this present invention provides automatic raising and lowering of the outboard motor and propeller. a boat is normally low when the boat is operating near shore or is navigating in treacherous waters; in these cases my invention automatically raises the propeller to mini-' mize its chances of being damaged. It must be recognized that at least a portion of the propeller 13, and

preferably all of it must be in the water in all positions desirable to maintain as much height of the motor above the waves as possible when the boat is at rest or moving very slowly. At higher boat speeds, a trough is formed behind the boat transom which lowers the water surface, permitting the motor to be safely lowered, which is automatically effected by my invention. Also, even at low forward speeds, the motor will be protected to a great extent from waves by the boat itself, so the springs 12 can be designed to automatically lower the motor at relatively low thrusts.

It is evident that any propeller means could be mounted similarly to that of the outboard motor propeller 13 in FIGURE 2 in such a manner as to be automatically lowered by action of its thrust. It has been found that struts of many outboard motors have relatively wide sections Patented Jan. 29, 1953 In this case the bias of springs 12 can be in- The propeller thrust of a few inches ahove their cavitation plates in order to house shock mounts, shaft bearings, and the like, which would tend to deflect large amounts of water when moving forward, since these sections would extend below the. support member 2'. It has been found desirable, therefore, to attach a wedge-shaped (in plan form) deflection plate 17 to the lower side of support member 2' to split the Water so it passes on either side of the motor strut. An inclined. plate (inside veiw) has sometimes been found unsatisfactory because of its tendency to. plane and produce upward oscillatingforces when the boat passes through waves which thereby: forces. the support member 2 to pivot away from and" then against lower stop member 7 in an objectionable manner. This oscillation can be eliminated by the use of deflection plate 17 or the addition of a shock absorber 18', shown schematically in FIGURE 2 attached between brackets 3" and support member 2 or by means of a latch that auto matically locks support member 2 in the lower position duringhigh speed operation. The shock absorber 18 may also be conveniently used to cushion the movementsv of support member 2 when it moves awayfrom or toward upper stopnuts 16 and lower stop nuts 7.

An alternate method of construction of the biasing means, stops,. and shock absorber is schematically shown in- FIGURE 3, wherein a spring 12a is placed in compression betweenend of cyl-iner 19' and piston 21'; piston. 21 is attached to rod-22, which in turn is pivotallybolte'd to support member 2 near its upper edge. Cylinder 19 ispivotally attached to bracket 3'. A nut 23 is screwed on rod 22 to provide upper stop means, and peg 24 is positioned in cylinder 19, to provide lower stop means to limit the oscillation of support member 2. Cylinder 19 can be filled with a viscous fluid and the piston provided with an orifice= 21a to thereby act as the aforementioned shock absorber.

Another alternate construction is shown in FIGURE 4, wherein the support' member 2 is pivotally mounted to brackets 3- near their upper end, and-a spring'12c is placed in compression between end of cylinder 19aand elongated piston 21b, which in turn" is pivotally attached to support member 2. The left end of cylinder 19a is pivotally attached to bracket 3; The lower stop means in this caseconsists of peg 24a placed through piston 21]) and the upper stop means consists'of cable 26 attached between bracket 3- and support member 2. In this alternate constructionthe main advantageis that the support member 2 can be pivoted to a' position almostwithin the boat (shown in dotted lines), uponrelease of cable 26 and cylinder: 19a from bracket 3, in order torepair-"the-motor or; propeller while. at sea without having to remove the motor from support member 2.

An important use of this novel invention is in combination with a hydrofoil boat shown in operation in FIGURE 5. As the boat 27- gains speed, it rises on its hydrofoils 28, ina manner well known by those skilled in; the art. An: outboard boat having hydrofoils may risefrom a few inches to over a foot above the wateronits-hydrofoils at higher speeds. Consequently, if a conventional short shaft outboard motor is to be utilized for propulsiomit must be: lowered withrespect to the boat to keep its propeller submerged at these higher speeds. At lower speeds, when the boat once again contacts the water, the motor must be raised again so it will not be damaged by waves. Consequently, the mounting means for boat propulsion. described herein is uniquely suited for use with a hydrofoil craft. Such a craft is illustrated for example in my co-pending application Serial No. 854,176, filed November 19-, 1959 entitled Hydrofoil for Water Craft. If it is. desired to supply a kit composed of hydrofoils' adapted to be attached to a. conventional outboard boat, to-convert it. into. a hydrofoil craft, the outboard. mot-or. mount describedhereinisv ideally suited for use. with. or. inclusion with. such a kit, since the. smaller. outboard. motor boatsv are powered by conventional short shaft motors.

I. claim as. my invention:

1.. Mounting means for av boat propulsion mechanism having, a rotary propeller, comprising: means defining a transverse, generally horizontalaxis on: a. boat transom adjacent the bottom thereof; a bracket pivotally mounted on said transom. about said axis, said bracket extending rearwardly and" generally horizontally from said axisand having amounting portion. thereon adjacent. therear end thereof, propulsion. meanshaving. a propeller mounted onsaid mounting portion to. rotate, on a foreand-aft axis. passing. below said transverse axis; thehorizontal distance from said transverse axis. to. said. propeller being at least about equal. to the vertical distance between said transverse axis and. said fore-and-aft axis whereby said propeller moves generally vertically downa wardly as. said bracket pivots about said. transverse. axis in response to forward thrust of. said. propeller.

2'. Mounting meansas defined in claim 1- including.

resilient means urging said bracket to swing upwardly to normally counterbalance. the weight of saidbracket andpropulsion means but yi eldable to permitsaid bracket to swing downwardly by forward. thrust. developed by. said propellen.

3. Mounting means as defined in claim 1 wherein said mounting portion comprises. an'upright board for remo.v ably mounting an outboard motor.

4. Mounting means as defined inclaim l includingv means limiting the range of movement of. said bracket about said transverse axis. to a sector. wherein the motion of said propeller isprincipally vertical.

References Cited inthe file of this patent UNITED STATES. PATENTS 2,713,843 Staley July 26, 1955. 2,748,743- Shogran Iune'5, .1'956 2,749,869 Bush June 12-, 1956: 2,782,744 Staley Feb. 26, 1957 2,795,202. Hook. June. 11', 1957 2,856,877 Baker Oct. 21, 1958 2,886,462 Iagiel May 12, 1959 2,916,009 Baird Dec. 8, '1959 FOREIGN PATENTSv 484,373 Italy Sept. 8, 1953

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2713843 *Dec 22, 1952Jul 26, 1955Staley Thomas GVariable depth motor mount
US2748743 *Mar 27, 1953Jun 5, 1956Arnold ShogranOutboard motor repositioning means
US2749869 *Jul 27, 1951Jun 12, 1956Hydrofoil CorpPressure bulb control mechanism for hydrofoil craft
US2782744 *Jun 24, 1954Feb 26, 1957Staley Thomas GOutboard motor mounting apparatus
US2795202 *Aug 18, 1954Jun 11, 1957Christopher HookHydrofoil craft
US2856877 *Nov 4, 1955Oct 21, 1958Gordon Baker JohnHydrofoil system for boats
US2886462 *Mar 18, 1957May 12, 1959Jagiel Air Boat CompanyBoat attachment
US2916009 *May 15, 1958Dec 8, 1959Otho P BairdTiltable outboard motor mount attachment for boats
IT484373B * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3164118 *Sep 19, 1962Jan 5, 1965Aqua Flite Hydrofoil CorpHydrofoil system for outboard boat
US3241511 *Feb 20, 1964Mar 22, 1966Drtina Otto VBoat hulls, motor-propeller units and hydrofoil combinations
US3245641 *Jan 8, 1964Apr 12, 1966Willard J KiserMounting means for motors
US3915417 *Sep 3, 1974Oct 28, 1975Johnny Reb Lure CompanyBoat motor mounting assembly
US3968768 *Sep 29, 1975Jul 13, 1976Solt Dean LRemotely controlled steering transom for outboard motors
US3990660 *Nov 10, 1975Nov 9, 1976Pipoz Georges RBoat auxiliary motor support
US4367860 *Sep 25, 1980Jan 11, 1983Outboard Marine CorporationHigh pivot transom bracket assembly for mounting outboard motor
US4482332 *Jan 27, 1984Nov 13, 1984Emmons J BruceArrangement for mounting and steering an outboard motor
US4545559 *May 9, 1984Oct 8, 1985Gilbreath James COutboard motor support bracket
US4657513 *Mar 11, 1985Apr 14, 1987Outboard Marine CorporationTransom bracket water deflector for improved boat performance
US4669698 *Nov 5, 1985Jun 2, 1987Mcguire Michael JOutboard motor mounting bracket
US4690094 *Mar 31, 1986Sep 1, 1987Taylor James FBoat with changeable configuration hull
US4713028 *Jun 19, 1986Dec 15, 1987Don DuffShallow water boat design
US4716847 *Nov 17, 1986Jan 5, 1988Wilson Jr Earl BMultiple-hulled marine vessel
US4741714 *Feb 27, 1987May 3, 1988Sanshin Kogyo Kabushiki KaishaSupporting device for marine propulsion apparatus
US4776294 *Jun 15, 1987Oct 11, 1988Childs John MShip stabilizer assembly
US4836124 *Oct 1, 1987Jun 6, 1989Brunswick CorporationMounting assembly with trim plate for outboard motors
US4878865 *Dec 7, 1987Nov 7, 1989Nissan Motor Co., Ltd.Outboard propulsion unit supporting system for boat
US4890811 *Dec 23, 1988Jan 2, 1990Ehni Scott MOutboard motor mounting means for boats
US4915050 *Nov 14, 1988Apr 10, 1990Wicker Ronald ESteering mechanism for outboard motor
US6520813 *Aug 10, 2001Feb 18, 2003Devito, Jr. Richard D.Trolling motor mounting means
US6863581 *Mar 27, 2002Mar 8, 2005Carl E. AndersonTrolling motor
US8286574Feb 11, 2008Oct 16, 2012Mueller Peter ALowerable platform with float for a watercraft
US8516973 *Apr 19, 2011Aug 27, 2013Robert D. HamiltonMotor powered kayak system
US8523620 *Sep 29, 2011Sep 3, 2013Dwayne Ray HopkinsFloating transom
US20020142680 *Mar 27, 2002Oct 3, 2002Anderson Carl E.Trolling motor
US20130084761 *Apr 4, 2013Dwayne Ray HopkinsFloating transom
WO1987000813A1 *Jul 28, 1986Feb 12, 1987Wilson Silvia Dorothy PreisigMultiple-hulled marine vessel
WO2004016502A1 *Aug 18, 2003Feb 26, 2004Bree Charles CaulderTilt mechanism
WO2008098393A1Feb 11, 2008Aug 21, 2008Peter A MuellerLowerable platform comprising a float for water craft
U.S. Classification440/53, 248/642, 114/279
International ClassificationB63H20/06, B63H21/00, B63H20/00, B63H21/30, B63H20/10
Cooperative ClassificationB63H20/10, B63H20/06, B63H21/305
European ClassificationB63H21/30B, B63H20/06, B63H20/10