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GB2353976A - Vessel having retractable keels - Google Patents

Vessel having retractable keels Download PDF

Info

Publication number
GB2353976A
GB2353976A GB9921058A GB9921058A GB2353976A GB 2353976 A GB2353976 A GB 2353976A GB 9921058 A GB9921058 A GB 9921058A GB 9921058 A GB9921058 A GB 9921058A GB 2353976 A GB2353976 A GB 2353976A
Authority
GB
United Kingdom
Prior art keywords
keel
keels
vessel
guide channels
lower position
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Withdrawn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
GB9921058A
Other versions
GB9921058D0 (en
Inventor
David William Knight
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9921058A priority Critical patent/GB2353976A/en
Publication of GB9921058D0 publication Critical patent/GB9921058D0/en
Publication of GB2353976A publication Critical patent/GB2353976A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B41/00—Drop keels, e.g. centre boards or side boards ; Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B41/00—Drop keels, e.g. centre boards or side boards ; Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels
    • B63B2041/003—Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels
    • B63B2041/006—Telescopically collapsible keels

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Barrages (AREA)

Abstract

A vessel has at least two mechanically retractable keels (2, Fig 4), wherein the keels are lockable in an upper or a lower position. The retracting mechanism 1 may comprise a double chain and sprocket arrangement linked to a power unit. The keels may be located in guide channels 8 which support the full height of the keel and provide wedge interfaces for locking the keels in the upper and lower positions. The keels may be formed of metal and/or plastics material and along with the guide channels may be situated in a watertight housing 3 having removable side (5, Fig 1) and top (4, Fig 4) covers to allow maintenance of the mechanism and keel.

Description

2353976 COASTAL WATERS NARROWBOAT This invention relates to the
development of the Canal narrowboat for use on river estuaries and coastal waters.
Narrowboats designed for cruising the extensive British canal system have a maximum beam of 2.1 metres, are flat-bottomed and of shallow draught. Any waters that are open and tidal are considered unsuitable for the narrowboat to use as they are difficult to steer in conditions of a strong 'side-on'force caused by wind and current.
According to this invention there is provided internal retractable side keels which when lowered give a double keel feature to the hull enabling the boat to be steered effectively and safely in open waters. When the keels are fully raised for canal use they do not interfere with either the amount of room inside the boat or the flat bottom feature of the hull.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:- Figure 1 shows a section through the narrowboat with the keel at (A) fully retracted and the keel at (B) fully lowered.
1 Figure 2 shows an elevation of the boat and the related positions of the keels and their respective lifting and lowering mechanisms.
Fi gure 3 shows a detailed elevation of the keel in its retracted position.
Figure A shows a detailed elevation of the keel in its lowered position.
Referring to the drawings the keels comprise of:
Item 1 Fig 3. The keel lifting and lowering mechanism consisting of an easily removed chain and sprocket arrangement connected to a power unit.
Item 2 Fig 4. The keel is manufactured from flattened plate steel, galvanised, having a tapered bottom edge so as to give a lead-in to any encountered obstruction while cruising. The keel is free to retract under an upward force as the keel is supported by chains.
Item 3 Fig 3. The keel enclosure is of watertight, all welded steel construction from the bottom plate Item 10 Fig 1. to the deck edge Item 9 Fig 1. and attached to the inside of the boat hull.
Item 4 Fig 4. The top inspection cover will fit flush with the deck edge giving smooth surface along the length of the boat and of sufficient dimensions to allow for the removal of the keel.
2 Item 5 Fig 1. Side inspection covers of watertight construction to enable power unit, chains and sprockets to be removed prior to lifting the keel from the boat for maintenance purposes.
Item 6 Fig 3. Keel locking rods are provided to lock the keel in the retracted position while cruising the canals and also to hold the keel in position while the lifting mechanism is being removed for maintenance purposes.
Item 7 Fig 3. Adjustment facility to enable accurate keel alignment into the guides.
Item 8 Fig 3. Guide channels or rollers to give smooth movement and secure location to the keel.
The keels are arranged in pairs on either side of the boat. There can be from one pair of keels up to four pairs of keels per boat depending upon the length of the boat.
3 4

Claims (6)

1. Each side keel built into the coastal waters narrowboat is suspended by a mechanism which raises and lowers the keel; the said mechanism being contained in the keel housing incorporating devices to lock the keel in the upper and lower position.
A side keel as claimed in Claim 1 where the mechanism is a double chain and sprocket arrangement linked to a power unit.
3. A side keel as claimed in Claim 1 or Claim 2 is located in guide channels which support the full height of the keel which house a wedge interface for fixing the keel in it's upper and lower position.
4. A side keel as claimed in any preceding claim where the watertight housing has removable side and top covers in order to service the mechanism and keel.
5. A side keel as claimed in any proceeding claim which is made from metal and plastics material, or from a combination of these materials.
6. A side keel substantially as herein described and illustrated in the accompanying drawings.
GB9921058A 1999-09-08 1999-09-08 Vessel having retractable keels Withdrawn GB2353976A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9921058A GB2353976A (en) 1999-09-08 1999-09-08 Vessel having retractable keels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9921058A GB2353976A (en) 1999-09-08 1999-09-08 Vessel having retractable keels

Publications (2)

Publication Number Publication Date
GB9921058D0 GB9921058D0 (en) 1999-11-10
GB2353976A true GB2353976A (en) 2001-03-14

Family

ID=10860452

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9921058A Withdrawn GB2353976A (en) 1999-09-08 1999-09-08 Vessel having retractable keels

Country Status (1)

Country Link
GB (1) GB2353976A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2399057A (en) * 2004-04-23 2004-09-08 Hewie Edward Dalrymple Drop keels for high speed flat bottomed vessels
US7210422B1 (en) * 2003-03-07 2007-05-01 Aluminum Chambered Boats Llc, Inc. Fin stabilizer to reduce roll for boats in turns method and apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1272543A (en) * 1969-06-18 1972-05-03 Charles Elie Louis Chauveau Drop-keels for boats
US4928613A (en) * 1988-11-09 1990-05-29 Rudolf William B Retractable steering device for cargo barges that increases maneuverability by providing a pivot point or points when altering course

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1272543A (en) * 1969-06-18 1972-05-03 Charles Elie Louis Chauveau Drop-keels for boats
US4928613A (en) * 1988-11-09 1990-05-29 Rudolf William B Retractable steering device for cargo barges that increases maneuverability by providing a pivot point or points when altering course

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7210422B1 (en) * 2003-03-07 2007-05-01 Aluminum Chambered Boats Llc, Inc. Fin stabilizer to reduce roll for boats in turns method and apparatus
GB2399057A (en) * 2004-04-23 2004-09-08 Hewie Edward Dalrymple Drop keels for high speed flat bottomed vessels
GB2399057B (en) * 2004-04-23 2005-02-02 Hewie Edward Dalrymple Drop keels for high speed flat bottomed vessels

Also Published As

Publication number Publication date
GB9921058D0 (en) 1999-11-10

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)