EP0062418A2 - Schutzsystem für eine an einem Boot befestigbare Antriebseinheit - Google Patents

Schutzsystem für eine an einem Boot befestigbare Antriebseinheit Download PDF

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Publication number
EP0062418A2
EP0062418A2 EP82301268A EP82301268A EP0062418A2 EP 0062418 A2 EP0062418 A2 EP 0062418A2 EP 82301268 A EP82301268 A EP 82301268A EP 82301268 A EP82301268 A EP 82301268A EP 0062418 A2 EP0062418 A2 EP 0062418A2
Authority
EP
European Patent Office
Prior art keywords
propulsion unit
release
detent means
cage
detent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82301268A
Other languages
English (en)
French (fr)
Other versions
EP0062418A3 (de
Inventor
James Patrick Fitzgerald-Smith
John Edward Hance
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of EP0062418A2 publication Critical patent/EP0062418A2/de
Publication of EP0062418A3 publication Critical patent/EP0062418A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/08—Means enabling movement of the position of the propulsion element, e.g. for trim, tilt or steering; Control of trim or tilt
    • B63H20/10—Means enabling trim or tilt, or lifting of the propulsion element when an obstruction is hit; Control of trim or tilt
    • B63H20/106—Means enabling lifting of the propulsion element in a substantially vertical, linearly sliding movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/36—Transporting or testing stands ; Use of outboard propulsion units as pumps; Protection of power legs, e.g. when not in use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • B63H5/165—Propeller guards, line cutters or other means for protecting propellers or rudders

Definitions

  • This invention relates to a protection system for a propulsion unit which is pendently attachable to a boat or a pontoon, an outboard motor for example.
  • Protection systems which rely upon mounting the propulsion unit on a horizontal pivot and providing a shear pin to hold the unit in a vertical position. If the unit is struck from the front by an underwater obstruction the pin shears and the unit pivots upwards to clear the obstruction. This system suffers from the disadvantage that the shear pin has to be replaced before the unit can be deployed. Furthermore the system only protects against blows from the front, no protection being provided against blows in an upwards or sideways direction, such as may occur when a pontoon, for example, is swept sideways by a current or is loaded rapidly in shallow water and its draught changes in a few seconds crushing the propulsion unit against the bottom.
  • the present invention seeks to provide a readily re-deployable system which will protect against blows received in forward, reverse, sideways and upwards directions.
  • a propulsion unit protection system includes: a support frame from which a propulsion unit is slideably protrusible by an externally applied force; retraction means energisable by protrusion of the propulsion unit; detent means for maintaining the propulsion unit in a protruded state against the pressure exerted by the energised retraction means; a sensing cage disposed about the propulsion unit and resiliently attached thereto; and a release means coupled between the sensing cage and the detent means so as to release the detent means when the disposition of the sensing cage relative to the propulsion unit is disturbed.
  • the release means may be mechanical, hydraulic or pneumatic.
  • One convenient mechanical arrangement comprises a contractible release arm which may consist of two articulated rigid members or alternatively a single flexible member,coupled at one end to the sensing cage via a ball joint and at the other to the detent means via a deflection amplifying lever.
  • An impact against the cage in any direction other than outwardly from the support frame will cause increased cranking or bending of the release arm and hence contraction of the overall length of the arm so as to deflect the amplifying lever thereby to release the detent means.
  • An alternative pneumatic arrangement may comprise one or more pneumatic chambers compressible between the sensing cage and the propulsion unit, which chambers are pneumatically coupled with a cylinder and piston arrangement operative upon the detent means so as to release the detent means when any one of the chambers is compressed.
  • the pneumatic chambers may be replaced by piston and cylinder assemblies hydraulically coupled with the release means.
  • the retraction means may conveniently comprise one or more helical compression springs axially disposed in the direction of sliding and compressible between the propulsion unit and the support frame when the propulsion unit is protruded.
  • pneumatic or hydraulic compression springs may be similarly employed or tension springs may be attached between the unit and the frame so as to be extended When the unit is protruded.
  • Figures 1 and 2 are part-sectioned side elevations of a propulsion unit protection system having a mechanical detent release means, and drawn respectively with the propulsion unit retracted and protruded
  • Figure 3 is an end elevation of the same system viewed in the direction A of Figure 2
  • Figures 4. and 5 are part views of alternative pneumatic and hydraulic detent release means respectively.
  • the system illustrated in Figs. 1 and 2 comprises a support frame 1 which is attachable to a vessel to be propelled via members 2 and 3 having any convenient attachment means (not shown).
  • the frame has an upper platform 4 and a lower platform 5 respectively having coaxial bores 6 and 7 within which a cylindrical post 8 is slideable.
  • the post 8 supports at its lower end a propulsion unit 9 and is suspended from a bearer plate 10, within which bearer plate it is captively rotatable about its own axis.
  • the propulsion unit 9 can be manually protruded in a downwards direction from the frame 1 by pressing the bearer plate 10 towards the upper platform 4.
  • a detent means is provided for holding the propulsion unit in the protruded position which comprises a spring biassed catch 1,5 rotatably attached to the post 8, within a bifurcated portion 8a thereof, at a transverse pivot 16. The catch deflects upwardly to pass through the bore 7 when the post 8 is depressed, thereafter to snap into engagement with a lock ring 17 mounted at the lower end of the bore 7.
  • a pull rod 18 rotatably attached to the catch 15 is articulated to a deflection amplifying lever 19 which is rotatable about a pivot 20 laterally disposed between a pair of cheek plates 21 attached to the post 8.
  • a jointed detent release arm 25 consisting of two pivotally interconnected members 25 a and 25 b, member 25 a being attached to the lever 19 at a pivot 26 and member 25 b being connected to the cage 22 via a ball joint 27 ( Figure 3). Any upwardly or laterally acting blow upon the cage will cause the jointed arm 25 to momentarily flex thus shortening its overall length and so rotating the lever 19 anti-clockwise (as drawn). This in turn pulls the pull rod 18 downwards to release the catch 15 from the lock ring 17 thereby releasing the energy stored in the springs 11 to rapidly raise the propulsion unit.
  • the length and weight of the springs are selected to raise the propulsion unit in approximately 0.1 seconds, the estimated time for preventing damage to the unit when travelling at speeds of up to 7 knots.
  • FIG. 4 An alternative pneumatic detent release means is illustrated in Figure 4 which comprises a plurality of compressible chambers 29 evenly disposed interjacent the propulsion unit 9 and a sensing oage 30 so as to be compressed between them when the cage is struck, at least one being compressed whatever the direction of the blow.
  • the chambers are pneumatically coupled in series connection via a tube 31 to an inlet port 32 of a cylinder block 33 attached to the lower platform 5.
  • the cylinder block 33 contains a piston 34 bearing a detent stub 35 which engages with a recess 36 in the post 8, the stub being biassed into engagement with the recess by a spring 37.
  • any impact to the cage 30 causes at least one of the chambers 29 to be compressed, thus transmitting a pressure pulse via the tube 31 which overrides the pressure of the spring 37 to disengage the detent stub 35 from the recess 36.
  • FIG. 5 An alternative, hydraulically operated detent release means is illustrated in Figure 5 in which the compressible chambers 29 of Figure 4 are replaced by piston and cylinder assemblies 40 hydraulically coupled via the tube 31 to the detent release means.
  • a particular advantage of the invention is that the propulsion unit can be speedily reset to the protruded position once an obstruction has been cleared, by simple manual pressure upon the bearer plate, no replacement of components being necessary.
  • the specific propulsion unit illustrated has a hydraulic drive (not shown) but the invention is of course equally applicable to conventional propulsion units having mechanical drive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Transportation (AREA)
  • Earth Drilling (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
EP82301268A 1981-04-06 1982-03-12 Schutzsystem für eine an einem Boot befestigbare Antriebseinheit Withdrawn EP0062418A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8110674 1981-04-06
GB8110674 1981-04-06

Publications (2)

Publication Number Publication Date
EP0062418A2 true EP0062418A2 (de) 1982-10-13
EP0062418A3 EP0062418A3 (de) 1983-04-06

Family

ID=10520952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82301268A Withdrawn EP0062418A3 (de) 1981-04-06 1982-03-12 Schutzsystem für eine an einem Boot befestigbare Antriebseinheit

Country Status (2)

Country Link
EP (1) EP0062418A3 (de)
GB (1) GB2096082B (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR16519E (fr) * 1911-12-12 1913-02-21 Jean De Bosredon Canot automobile à très faible tirant d'eau et son dispositif d'armement pour la chasse
US2479119A (en) * 1943-07-30 1949-08-16 Harold I Johnson Propeller drive unit with automatic depth regulation
US2706959A (en) * 1953-10-20 1955-04-26 Alva D Downs Safety mount for an outboard motor
GB934877A (en) * 1960-09-20 1963-08-21 Instr Res Lab Ltd Marine propulsion unit attachable to boats
GB1040621A (en) * 1962-03-23 1966-09-01 Reiners Walter A marine outboard drive

Also Published As

Publication number Publication date
GB2096082B (en) 1984-06-27
GB2096082A (en) 1982-10-13
EP0062418A3 (de) 1983-04-06

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Payment date: 19890405

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Inventor name: HANCE, JOHN EDWARD

Inventor name: FITZGERALD-SMITH, JAMES PATRICK