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Publication numberUS3628487 A
Publication typeGrant
Publication dateDec 21, 1971
Filing dateJan 19, 1970
Priority dateJan 19, 1970
Publication numberUS 3628487 A, US 3628487A, US-A-3628487, US3628487 A, US3628487A
InventorsBennett Charles H
Original AssigneeBennett Charles H
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hydraulically operated trim attachment for powerboats
US 3628487 A
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Description  (OCR text may contain errors)

0 United States Patent 1 1 3,628,487

[72] Inventor Charles H. Bennett [56] References Cited 20400 Nine Mile Road, St. Clair Shores, UNITED STATES PATENTS 21 A I N 8080 3,177,837 4/1965 Sherrill 114/665 P l 1 2,790,426 4/1957 Mueller.. 92/119 [22] 3 431 031 3/1969 lk 92/92 x 451 Patented Dec. 21 1971 e 2,479,063 8/1949 Forsythe l 14/150 Primary Examiner-Andrew H. Farrell [54] HYDRAUUCAL Y P A E TRIM Attorney-Barnes, Kisselle, Raisch & Choate ATTACHMENT FOR POWERBOATS 22 Claims, 8 Drawing Figs.

ABSTRACT: A powerboat including a pair of trim members [52] U.S.Cl 114/665 hinged to the Stem of the bum and a hydraulic cyfinder in [51] lnt.Cl B63!) 1/22 ll b E h h d d [50] Field ofsearch 1l4/66.5 P, I l Oeac mem ac y raulc Cym ens conlSO; 244/85; 92/92, 119

structed and arranged so that no external hydraulic lines are needed between the boat and the cylinder. The hydraulic pump has unique features to control volume and pressure.

PATENTEUUEEZHH?! 3,628.48?

sum 1 OF 2 /6 IN VEN TOR.

(A A2155 BAN/Vffi' BY ATTORNEYS PATENTED [IECZI I97! SHEET 2 [IF 2 FIG.4

INVENTOR.

ATTORNEYS HYDRAULICALLY OPERATED TRIM ATTACHMENT FOR POWERBOATS This invention relates to boats and particularly to powerboats.

BACKGROUND OF THE INVENTION In my prior U.S. Pat. No. 3,062,167, issued Nov. 6, 1962, and No. 3,399,643, issued Sept. 3, I968, there are disclosed and claimed trim attachments for powerboats which comprise trim members that are hinged to the stern of the boat and are actuated to vary the angles thereof and thereby provide control of the attitude of the boat. Such arrangements permit longitudinal and lateral trimming of the boat under varying load in order to obtain optimum attitude for movement of the boat through the water and result in greater speed with less fuel consumption, improve visibility, and permit adjustment to be made under varying load conditions and to be removed in rough water.

Among the objects of the invention are to provide a hydraulically operated trim attachment for trim members of the type shown in the aforementioned patents which includes a novel hydraulic operating mechanism that does not utilize external supply lines; which utilizes a novel hydraulic cylinder structure; and which can be operated in both fresh and salt water without damage to the trim attachment.

SUMMARY OF THE INVENTION A powerboat including a pair of trim members hinged to the stern of the boat and a hydraulic cylinder individual to each trim member. The hydraulic cylinder is constructed and arranged so that no external hydraulic lines are needed between the boat and the cylinder. The hydraulic pump has unique features to control volume and pressure.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary perspective view of a boat embodying the invention.

FIG. 2 is a part sectional side elevational view of a portion of the boat shown in FIG. 1.

FIG. 3 is a fragmentary sectional view of a portion of the cylinder shown in FIG. 2.

FIG. 4 is a schematic diagram of the control system.

FIG. 5 is a part sectional elevational view of a portion of the system shown in FIG. 4.

FIG. 6 is a fragmentary sectional view taken along the line 66 in FIG. 5.

FIG. 7 is a fragmentary sectional view taken along the line 7-7 in FIG. 5.

FIG. 8 is a sectional view of a modified construction taken along the line 8-8 in FIG. 7.

DESCRIPTION Referring to FIG. 1, boat 10 has a pair of trim members 11 hinged to the transom 12 in the manner disclosed and claimed in the aforementioned U.S. Pat. Nos. 3,062,167, and 3,399,643. Each of the trim members comprises a generally flat portion 13 having an end 14 which is hooked into the hooked end 15 of a bracket I6 to provide a hinge. Each member further includes an upstanding flange 17. The underside of the trim member 11 when in horizontal position is substantially in the plane of the bottom 18 of the boat.

The angle of the trim member with respect to the boat can be varied by use of a hydraulic cylinder 20 comprising a cylindrical body 21 having a lower head 22 integral therewith and an upper head 23 that is threaded thereon. A piston 24 with an O-ring seal 25 is reciprocable within the cylinder and is yieldingly urged upwardly by a spring 26 interposed between the piston 24 and the lower head 22. Piston shaft 27 on piston 24 is pivoted to a bracket 29 on trim member 1 l. A hollow tubular bag element 30 is provided above the piston 24 and has a peripheral integral O-ring 31 (FIG. 3). The head 23 when threaded onto the body 21 engages the O-ring to provide a seal. The bag element 30 prevents the entry of water and the like which might leak past the piston 24 into the hydraulic system for operating the cylinder. The head 23 further includes an integral projection 32 that limits the upward movement of the piston 24. In practice, the bag element 30 is interposed in the cylinder with a layer of grease or oil between the outer surfaces thereof and the cylinder so that air will not be entrapped between the outer surface thereof and the cylinder.

Head 23 includes a generally rectangular interconnecting element or flange 33 having a fluid opening 34 therein and an integral bracket 35 which has a surface 36 for engaging the transom 12. A fluid line 37 extends through an opening 38 in the transom and is threaded into the bracket 35 in an opening 39 which communicates with passage 34.

Fluid can be selectively applied through line 37 to force the piston 24 downwardly or permitted to escape through line 37 to permit the spring 26 to force the piston upwardly. The spring functions to hold the tabs horizontal at dockside.

In accordance with the invention, the integral interconnecting element 33 is preferably made of plastic as is the entire head 23 and bracket 35 so that there is limited permissible movement between the head 23 and bracket 35 permitting accommodation for varying angles of the transom 12 as well as changes necessitated by the sweep of the connecting axis at bracket 29 as the angle of the trim tab is varied. A satisfactory plastic material comprises Nylon 610 made by E. I. duPont Company and incorporating glass fibers. The cylindrical body 21, piston 24; piston shaft 27, bracket 29 and pin are preferably made of the same material.

Referring to FIG. 4, the apparatus for controlling the flow of fluid to the cylinders 20 comprises a pump 40 which receives fluid from a reservoir 41 and when energized in one direction supplies the fluid through a line 42 to solenoid-operated valves 43, 44 controlling communication between the line 42 and line 37 to each of the cylinders. When the pump 40 is operated in one direction, fluid is supplied to the cylinder, and when it is operated in the opposite direction, fluid is withdrawn from the cylinders as the piston 24 forces the fluid out of the cylinder.

As shown in FIGS. 5, 6, and 7, the pump is of the wellknown gyrotor type and comprises a driven member 45 and a floating member 46. In accordance with the invention, the control of fluid from the reservoir 41 to the inlet 47 is through an orifice 48. The outlet of the pump has a portion thereof vented through an orifice 49 back to the reservoir thereby controlling pressure of fluid out of the pump.

The restricting orifice 48 on the supply side controls the volume or flow and the orifice 49 prevents an excessive pressure. For example, a 0.025 inch orifice on the pressure side reduces maximum pressure from 850 to 500 pounds. The control of volume through supply side orifice 48 enables the provision of gentle action of the tabs.

FIG. 8 shows a different type of a restrictor relief valve 60 and its design eliminates the need for energizing the pump to withdraw fluid from the actuators.

In FIG. 8 there is a floating piston 62 with an orifice 62a through it. An opening 61 extends from the pressure passage to the reservoir. A spring 63 has an adjusting screw or stop 64. Piston 62 has a portion 62b of reduced diameter in the area which covers the passage 61.

When pump is energized behind the piston 62 with the constricting orifice 62a moves with the flow and it covers the passage 61 making all of the fluid go to the actuators. When the actuators are at their limit of stroke the fluid is slowed and the spring 63 moves the floating piston back to at least partially open the passage 61 leading to the reservoir providing a limit on the pressure. Thus pressure is adjustable by the setscrew 64 against the spring 63.

For retracting the actuators it is only necessary to open the solenoid valve in the line and the fluidl will pass back into the reservoir as the spring 63 will have pushed the floating piston back opening the passage 62.

It will be appreciated that by operating the pump in one direction or the other, a varying inclination to the trim members can be achieved in order to produce the desired trim of the boat as more fully set forth in the aforementioned US. patents.

I claim:

1. In a powerboat, the combination comprising a pair or trim members hinged to the stern of the boat, one

on each side of the centerline of the boat,

means for hinging each said trim member along its forward edge to the boat,

and a hydraulic cylinder individual to each said trim member,

said cylinder comprising a body having a head at one end and a head at the other end,

a piston within said body,

a shaft connected to said piston extending through said second head,

means for connecting said shaft to said trim member,

a bracket having a surface complementary to the transom of the boat,

means for mounting said bracket on said transom,

means interconnecting said bracket and said first-mentioned head of said cylinder in a manner to permit limited relative movement therebetween,

said first head having a fluid opening therein,

said bracket having a fluid opening therein,

said interconnecting means having a fluid opening providing communication between said openings,

said interconnecting means between said bracket and said first head comprising an integral flange,

said flange having said fluid opening therein providing communication between the openings in said bracket and said first head.

2. The combination set forth in claim 1 wherein said bracket head and flange are made of integral plastic.

3. The combination set forth in claim 1 including a flexible wall within aid body of said cylinder in the end thereof opposite the end of said piston which has said shaft extending therethrough.

4. The combination set forth in claim 3 wherein said flexible wall is generally cylindrical in shape.

5. The combination set forth in claim 3 wherein said first head is removable,

said flexible wall having a portion thereof adapted to be claimed by said head against said body.

6. The combination set forth in claim 1 including controls for said cylinder comprising a pump, a reservoir, and

an inlet extending from said reservoir to said pump,

an outlet extending from said pump,

first orifice means between said inlet and said reservoir,

second orifice means between said outlet and said reservoir.

7. The combination set forth in claim 6 including a pressure release valve associated with said first-mentioned orifice means.

8. For use in a powerboat, the combination comprising a trim member adapted to be hinged to the stern of the boat,

means for hinging said trim member along its forward edge to the boat,

and a hydraulic cylinder,

said cylinder comprising a body having a head at one end and a head at the other end,

a piston within said body,

a shaft connected to said piston extending through said second head,

means for connecting said shaft to said trim member,

a bracket having a surface generally complementary to the transom of a boat,

means for mounting said bracket on said transom,

means interconnecting said bracket and said first-mentioned head of said cylinder in a manner to permit limited relative movement therebetween,

said first head having a fluid opening therein,

said bracket having a fluid opening therein,

said interconnecting means comprising a fluid opening providing communication between said openings,

said interconnecting means between said bracket and said first head comprising an integral flange,

said flange having an opening therein communicating with the openings in said bracket and said first head.

9. The combination set forth in claim 1 wherein said bracket, head and flange are made of integral plastic.

10. The combination set forth in claim 1 including a flexible wall within said body of said cylinder in the end thereof opposite the end of said piston which has said shaft extending therethrough.

11. The combination set forth in claim 10 wherein said flexible wall is generally cylindrical in shape.

12. The combination set forth in claim 10 wherein said first head is removable,

said flexible wall having a portion thereof adapted to be clamped by said head against said body.

13. The combination set forth in claim 1 including controls for said cylinder comprising a pump, a reservoir, and

an inlet extending from said reservoir to said pump,

an outlet extending from said pump,

first orifice means between said inlet and said reservoir,

second orifice means between said outlet and said reservoir.

14. The combination set forth in claim 13 including a pressure release valve associated with said first-mentioned orifice means.

15. The combination comprising a hydraulic cylinder,

said cylinder comprising a body having a first head at one end and a second head at the other end,

a piston within said body,

a shaft connected to said piston extending through said second head,

means for connecting said shaft to a work member,

a bracket having a surface generally complementary to the transom of a boat,

means for mounting said bracket on a support,

means interconnecting said bracket and said first-mentioned heat of said cylinder in a manner to permit limited relative movement therebetween,

said first head having a fluid opening therein,

said bracket having a fluid opening therein,

said interconnecting means comprising a fluid opening providing communication between said openings,

said interconnecting means between said bracket and said first head comprising an integral flange,

said flange having an opening therein communicating with the openings in said bracket and said first head.

16. The combination set forth in claim 15 wherein said bracket, head and flange are made of integral plastic.

17. The combination set forth in claim 15 including a flexible wall within said body of said cylinder in the end thereof opposite the end of said piston which has said shaft extending therethrough.

18. The combination set forth in claim 17 wherein said flexible wall is generally cylindrical in shape.

19. The combination set forth in claim 17 wherein said first head is removable,

said flexible wall having a portion thereof adapted to be clamped by said head against said body.

20. The combination set forth in claim 15 including controls for said cylinder comprising a pump, a reservoir, and

an inlet extending from said reservoir to said pump,

an outlet extending from said pump,

first orifice means between said inlet and said reservoir,

second orifice means between said outlet and said reservoir.

21. The combination set forth in claim 20 including a pressure release valve associated with said first-mentioned orifice means.

22. The combination comprising a hydraulic cylinder,

said cylinder comprising a body having a first head at one end and a second head at the other end,

a piston within said body,

said bracket having a fluid opening therein,

said interconnecting means comprising an integral flange having a fluid opening providing communication between said openings,

a flexible wall within said body of said cylinder in the end thereof opposite the end of said piston which has said shaft extending therethrough.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2790426 *Jun 11, 1952Apr 30, 1957Mueller OttoFluid device having joints in swiveled fluid conducting relationship
US3177837 *Nov 8, 1961Apr 13, 1965Sea Trim CorpBoat stabilizing unit
US3431031 *Jan 28, 1965Mar 4, 1969Wiz CorpVehicle brake operator
US3479063 *Dec 24, 1968Nov 18, 1969Flexfloat Eng CoFluid pressure tightened joint
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3742893 *Apr 14, 1972Jul 3, 1973Stelling WWater-jet propulsion and steering system for a multi-section prime-mover ship
US4410193 *Nov 14, 1979Oct 18, 1983Howard D URemotely adjustable compensator for centering steering systems
US4418931 *Aug 27, 1981Dec 6, 1983Howard D URemotely adjustable steering compensator
US4534577 *Jul 11, 1983Aug 13, 1985Howard D URemotely adjustable steering compensator
US4644893 *Aug 6, 1984Feb 24, 1987International Hydraulic Systems, Inc.Position indicating apparatus for use in a boat leveling system
US4742794 *Sep 8, 1986May 10, 1988Bennett Marine, Inc.Trim tab indicator system
US4854259 *Oct 14, 1988Aug 8, 1989Sta-Rite Industries, Inc.Improved trim-tab control system for power boats
US5117741 *Jan 16, 1990Jun 2, 1992Sta-Rite Industries, Inc.Double wall hydraulic cylinder
US5450643 *Oct 4, 1993Sep 19, 1995Kelley Company Inc.Edge-of-dock leveler
US5474013 *Mar 17, 1995Dec 12, 1995Trim Master Marine, Inc.Trim tab auto-retract and multiple switching device
US5621938 *Sep 8, 1995Apr 22, 1997Kelley Company, Inc.Edge-of-dock leveler and method of making
US5881666 *Jun 13, 1997Mar 16, 1999Crews, Jr.; L. JeremyWatertight trim tab actuator
US6460212Dec 3, 2001Oct 8, 2002Kelley Company, Inc.Dock leveler having an inflatable member
US6532889 *Jul 14, 2000Mar 18, 2003Tracker Marine, L.L.P.Aluminum fishing boat
US6711774Aug 16, 2002Mar 30, 2004Kelley Company, Inc.Dock leveler having an inflatable member
US6760944Feb 18, 2003Jul 13, 2004Kelley Company, Inc.Dock leveler having an inflatable member
US6910239May 14, 2004Jun 28, 2005Kelly Company, Inc.Dock leveler having an inflatable member
US7503089Apr 5, 2005Mar 17, 2009Rite-Hite Holding CorporationInflatable actuator for a dock leveler deck
US7905193Dec 28, 2007Mar 15, 2011Johnson Outdoors Inc.Trim tabs
US8216007 *Feb 27, 2006Jul 10, 2012Steven Clay MooreMethods and arrangements for rapid trim adjustment
US8387551Mar 5, 2007Mar 5, 2013Peter MüllerDouble trim tab
US20070202757 *Feb 27, 2006Aug 30, 2007Moore Steven CMethods and arrangements for rapid trim adjustment
EP1855015A1 *May 9, 2007Nov 14, 2007Besenzoni S.p.A.Linear hydraulic actuator
WO2007016805A1Aug 4, 2006Feb 15, 2007Peter A MuellerWatercraft steering mechanism and trimmer
WO2008106807A1Mar 5, 2007Sep 12, 2008Peter A MuellerDouble trim hatch
WO2012097464A2Jan 18, 2012Jul 26, 2012Mueller Peter AStepped trim tab
Classifications
U.S. Classification114/287
International ClassificationB63B1/18, B63B39/00, B63B1/16, B63B39/06
Cooperative ClassificationB63B39/061
European ClassificationB63B39/06B