US3086227A - Ships' gravity davits for launching lifeboats from stowed positions between decks - Google Patents
Ships' gravity davits for launching lifeboats from stowed positions between decks Download PDFInfo
- Publication number
- US3086227A US3086227A US34008A US3400860A US3086227A US 3086227 A US3086227 A US 3086227A US 34008 A US34008 A US 34008A US 3400860 A US3400860 A US 3400860A US 3086227 A US3086227 A US 3086227A
- Authority
- US
- United States
- Prior art keywords
- arm
- davit
- lifeboat
- decks
- ships
- 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.)
- Expired - Lifetime
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B23/00—Equipment for handling lifeboats or the like
- B63B23/02—Davits, i.e. devices having arms for lowering boats by cables or the like
- B63B23/04—Davits, i.e. devices having arms for lowering boats by cables or the like with arms pivoting on substantially horizontal axes, e.g. gravity type
- B63B23/06—Davits, i.e. devices having arms for lowering boats by cables or the like with arms pivoting on substantially horizontal axes, e.g. gravity type with actual pivots
- B63B23/08—Davits, i.e. devices having arms for lowering boats by cables or the like with arms pivoting on substantially horizontal axes, e.g. gravity type with actual pivots the arms being articulated
Definitions
- the davit arm is suspended by means of two suspending arms (or sets of two suspending arms engaging the davit arm.
- each set of suspending arms one of the arms is shaped as a boomerang and is hinged at one end to the upper deck adjacent the outboard edge thereof and to the davit arm at a location close to the keel of the boat in its stowed position.
- the second arm of each set is hinged at one end thereof to the upper deck an appreciable distance inward from said edge and to the davit arm at a point spaced from the lower hinge of the first suspending arm and substantially in a vertical line with the connection of said second arm to the upper deck.
- the suspending arms are so arranged as to cause the d vit arm, when swung outwards, to perform a translatory and rotary movement such that the lifeboat moves along an outwardly and downwardly path which is outside the clear space which is defined by the lifeboat and davit with respect to the lower deck when the lifeboat is in stowed position.
- the suspending arms enable the davit arm and lifeboat to swing outboardly by the weight of the lifeboat.
- the gravity force on the lifeboat operates to swing it outboard.
- the gravity force is selectively balanced by the fall or cable supporting the lifeboat.
- the davit according to the invention has, inter alia, the following advantages:
- the usual suspension hook or tusk carried by the davit head may be rigidly secured thereto, so as to render superfluous a rather complicated device for locking the said hook when the same is pivotally mounted to the head.
- FIG. 1 is a front view of a life boat and of a davit arm suspended between decks in the manner stated hereinbefore, in stowed position,
- FIG. 2 is a similar view with the boat and the davit arm in outboard position
- FIG. 3 is a front view corresponding to that shown in FIG. 1 but illustrating a veranda on the lower deck right below the stowed boat.
- the numeral 4 indicates the upper deck, 5 the railing thereof, 6 the lower deck, 7 the railing there of, 8 the lifeboat, 9 the davit arm, 10 the head sheave of the arm, 11 the suspension hook or tusk" of the arm, 12 the fall for handling the boat, 13 a.
- FIG. 2 illustrates the boat and the davit arm in outboard position.
- the various parts shows therein have been indicated by the same reference numerals as in FIG. 1, so that further description thereof may be dispensed with.
- FIG. 3 is identical with FIG. 2 as far as the davit construction and the positions of the various parts are concerned, but illucidates the free deck space right below the stowed boat by the spacious veranda 23 having window pan-es 24. It further shows a space 25 below the balcony 22 for accommodating ventilating ducts.
- a gravity davit for a lifeboat of a ship the ship having upper and lower decks in spaced relation, the davit comprising: a davit arm having a free end adapted for supporting the lifeboat in a first position in the space between an upper and lower deck of the ship, the davit arm being of curved shape for accommodating the lifeboat and preventing inward movement thereof, two suspending arms pivotally connected to the upper deck for supporting the davit arm, one of said suspending arms being of curved shape and being pivotally connected at an end thereof to the upper deck at a location outboardly with respect to the lifeboat with the latter in said first position, said one arm having an end opposite to the first said end thereof and pivotally coupled to the davit arm at a location adjacent the free end of the davit arm, the other of said suspending arms having one end pivotally connected to the upper deck at a loca tion inboardly with respect to the lifeboat with the latter in said first position, said other suspending arm having an end opposite the first said end thereof and pivotally connected to said davit arm, such
Description
Apnl 23, 1963 M. SCHAT 3,086,227
SHIPS GRAVITY DAVITS FOR LAUNCHING LIFBBOATS FROM STOWED POSITIONS BETWEEN DECKS Filed June 6, 1960 2 Sheets-Sheet 1 IIIII'IIIIIIII'IIIIII'IIII'I'I I INVENTOR ala L- 5mm April 23, 1963 M. L. SCHAT 3,086,227
SHIPS GRAVITY DAVITS FOR LAUNCHING LIFEBOATS FROM STOWED POSITIONS BETWEEN DECKS Filed June 6, 1960 2 Sheets-Sheet 2 a an r I r S. I E o l 2 0/ E Q Q a o --a INVENTOR United States Patent Office 3,086,227 Patented Apr. 23, 1963 SHIPS GRAVITY DAVITS FOR LAUNCHING LIFE- BOATS FROM STOWED POSITIONS BETWEEN DECKS Martinns Leendert Schat, 13 Aldenham Ave, Radlett, England Filed June 6, 1960, Ser. No. 34,008 Claims priority, application Great Britain June 8, 1959 1 Claim. (Cl. 9-36) This invention relates to lifeboat gravity davits for ships, and more particularly to the type of gravity davits used for launching lifeboats from stowed positions between decks.
According to this invention, the davit arm is suspended by means of two suspending arms (or sets of two suspending arms engaging the davit arm. In each set of suspending arms, one of the arms is shaped as a boomerang and is hinged at one end to the upper deck adjacent the outboard edge thereof and to the davit arm at a location close to the keel of the boat in its stowed position. The second arm of each set is hinged at one end thereof to the upper deck an appreciable distance inward from said edge and to the davit arm at a point spaced from the lower hinge of the first suspending arm and substantially in a vertical line with the connection of said second arm to the upper deck. The suspending arms are so arranged as to cause the d vit arm, when swung outwards, to perform a translatory and rotary movement such that the lifeboat moves along an outwardly and downwardly path which is outside the clear space which is defined by the lifeboat and davit with respect to the lower deck when the lifeboat is in stowed position. The suspending arms enable the davit arm and lifeboat to swing outboardly by the weight of the lifeboat. Thus the gravity force on the lifeboat operates to swing it outboard. The gravity force is selectively balanced by the fall or cable supporting the lifeboat.
As compared with known davits of the type referred to, the davit according to the invention has, inter alia, the following advantages:
(1) The frictional resistance of the arm during its outward and inward movement is kept to a minimum, as distinguished from that of an arm provided with rollers or the like running in a trackway.
(2) Owing to the combined translatory and rotary movement of the arm, the usual suspension hook or tusk carried by the davit head may be rigidly secured thereto, so as to render superfluous a rather complicated device for locking the said hook when the same is pivotally mounted to the head.
(3) The boat in its stowed position is supported by the davit arm and cannot swing inboardly when the ship is rolling.
In order that our invention may be fully understood by those skilled in the art, reference is made to the accompanying drawing, wherein:
FIG. 1 is a front view of a life boat and of a davit arm suspended between decks in the manner stated hereinbefore, in stowed position,
FIG. 2 is a similar view with the boat and the davit arm in outboard position, and
FIG. 3 is a front view corresponding to that shown in FIG. 1 but illustrating a veranda on the lower deck right below the stowed boat.
In FIG. 1 the numeral 4 indicates the upper deck, 5 the railing thereof, 6 the lower deck, 7 the railing there of, 8 the lifeboat, 9 the davit arm, 10 the head sheave of the arm, 11 the suspension hook or tusk" of the arm, 12 the fall for handling the boat, 13 a. pulley for guiding the fall, 14 the boomerang-shaped first suspending arm, 15 the chock secured to the davit arm supporting the boat, 16 the pivot through which said first suspending arm is connected to the upper deck, 17 the keel support on the davit arm, 18 the pivot through which said first suspending is arm connected to the davit arm, 19 the second suspending arm, 20 the pivot through which the same is connected to the upper deck, 21 the pivot through which the same is connected to the davit arm, the latter pivot being at a level immediately below the lifeboat when the latter is in the stowed position and numeral 22 represents a balcony.
FIG. 2 illustrates the boat and the davit arm in outboard position. The various parts shows therein have been indicated by the same reference numerals as in FIG. 1, so that further description thereof may be dispensed with.
FIG. 3 is identical with FIG. 2 as far as the davit construction and the positions of the various parts are concerned, but illucidates the free deck space right below the stowed boat by the spacious veranda 23 having window pan-es 24. It further shows a space 25 below the balcony 22 for accommodating ventilating ducts.
What I claim is:
A gravity davit for a lifeboat of a ship, the ship having upper and lower decks in spaced relation, the davit comprising: a davit arm having a free end adapted for supporting the lifeboat in a first position in the space between an upper and lower deck of the ship, the davit arm being of curved shape for accommodating the lifeboat and preventing inward movement thereof, two suspending arms pivotally connected to the upper deck for supporting the davit arm, one of said suspending arms being of curved shape and being pivotally connected at an end thereof to the upper deck at a location outboardly with respect to the lifeboat with the latter in said first position, said one arm having an end opposite to the first said end thereof and pivotally coupled to the davit arm at a location adjacent the free end of the davit arm, the other of said suspending arms having one end pivotally connected to the upper deck at a loca tion inboardly with respect to the lifeboat with the latter in said first position, said other suspending arm having an end opposite the first said end thereof and pivotally connected to said davit arm, such that the pivotal connections of said other suspending arm are substantially vertically aligned, said other suspending arm being connected to said davit arm at a level immediately below the lifeboat with the latter in said first position such that, upon swinging of the davit arm outboardly, the lifeboat and davit move along an outboard downwardly path in spaced relation from the lower deck and outside a clear space defined by the lifeboat and davit with the lower deck when the lifeboat is in the first position.
References Cited in the file of this patent UNITED STATES PATENTS 2,929,081 Taylor Mar. 22, 1960 FOREIGN PATENTS 269,136 Great Britain Nov. 17, 1927 338,686 Great Britain Nov. 27, 1930 481,587 France Sept. 28, 1916 666,703 Great Britain Feb. 20, 1952 939,428 Germany Feb. 23, 1956
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3086227X | 1959-06-08 |
Publications (1)
Publication Number | Publication Date |
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US3086227A true US3086227A (en) | 1963-04-23 |
Family
ID=10921400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US34008A Expired - Lifetime US3086227A (en) | 1959-06-08 | 1960-06-06 | Ships' gravity davits for launching lifeboats from stowed positions between decks |
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US (1) | US3086227A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4961398A (en) * | 1989-02-13 | 1990-10-09 | Mountain Marine, Inc. | Davit assembly |
US11052975B1 (en) | 2020-02-12 | 2021-07-06 | John Livingston | Systems for lifting and stowing water-borne vessels |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR481587A (en) * | 1916-04-25 | 1916-12-19 | Michael Fenwick Temple | Advanced coat rack for maneuvering ships' canoes |
GB269136A (en) * | 1926-04-08 | 1927-11-17 | Ingvald Einar Peter Schroeder | Improvements in and relating to davits or the like |
GB338686A (en) * | 1929-10-19 | 1930-11-27 | Walter Douglas Gladstone | Improvements in means for launching ship's lifeboats |
GB666703A (en) * | 1949-01-14 | 1952-02-20 | Walter Gordon Moore | Improvements in or relating to launching and lowering gear for ships' lifeboats and the like |
DE939428C (en) * | 1951-05-24 | 1956-02-23 | Aluminium Francais | Gravity davit |
US2929081A (en) * | 1955-12-05 | 1960-03-22 | Welin Maclachlan Davits Ltd | Davits for launching ships' lifeboats |
-
1960
- 1960-06-06 US US34008A patent/US3086227A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR481587A (en) * | 1916-04-25 | 1916-12-19 | Michael Fenwick Temple | Advanced coat rack for maneuvering ships' canoes |
GB269136A (en) * | 1926-04-08 | 1927-11-17 | Ingvald Einar Peter Schroeder | Improvements in and relating to davits or the like |
GB338686A (en) * | 1929-10-19 | 1930-11-27 | Walter Douglas Gladstone | Improvements in means for launching ship's lifeboats |
GB666703A (en) * | 1949-01-14 | 1952-02-20 | Walter Gordon Moore | Improvements in or relating to launching and lowering gear for ships' lifeboats and the like |
DE939428C (en) * | 1951-05-24 | 1956-02-23 | Aluminium Francais | Gravity davit |
US2929081A (en) * | 1955-12-05 | 1960-03-22 | Welin Maclachlan Davits Ltd | Davits for launching ships' lifeboats |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4961398A (en) * | 1989-02-13 | 1990-10-09 | Mountain Marine, Inc. | Davit assembly |
US11052975B1 (en) | 2020-02-12 | 2021-07-06 | John Livingston | Systems for lifting and stowing water-borne vessels |
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