EP0875448A2 - Braking device, particularly for braking the descent of a life-boat - Google Patents
Braking device, particularly for braking the descent of a life-boat Download PDFInfo
- Publication number
- EP0875448A2 EP0875448A2 EP98107306A EP98107306A EP0875448A2 EP 0875448 A2 EP0875448 A2 EP 0875448A2 EP 98107306 A EP98107306 A EP 98107306A EP 98107306 A EP98107306 A EP 98107306A EP 0875448 A2 EP0875448 A2 EP 0875448A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- braking
- discs
- disc
- rotating member
- static
- 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- Withdrawn
Links
- 230000003068 static effect Effects 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000000110 cooling liquid Substances 0.000 claims description 4
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/04—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes actuated by centrifugal force
-
- 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
- B63B23/40—Use of lowering or hoisting gear
- B63B23/42—Use of lowering or hoisting gear with braking equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/12—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect
- B66D5/14—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect embodying discs
Definitions
- This invention relates to a braking device, in particular for braking the descent of a life-boat lowered from a ship.
- a further drawback of known braking devices is related to the fact that they have always to be activated and regulated by an operator who, for example, during the descent of a life-boat has to regulate the braking action of the device on the basis of the life-boat descent speed, and which in a panic and/or danger situation can be difficult and uncomfortable.
- centrifugal disc clutches are known (see for example patent EP0443149 filed by the present applicant) comprising means for transmitting movement from a drive shaft to a driven shaft via a mass consisting of a loose material, possibly in fluid or powder form, which by the centrifugal effect urges a friction disc connected to the drive shaft and a friction disc connected to the driven shaft into contact with each other.
- An object of this invention is to provide a braking device which ensures perfect efficiency even after repeated periods of operation, for example after repeated tests involving life-boat lowering into the sea, and which requires neither frequent maintenance nor frequent replacement of its components.
- a further object is to provide a braking device the effect of which can also be regulated automatically, proportionally to the speed attained by the braking member, without the intervention of an operator.
- a braking device comprises a hub 1, rigidly secured to a wall 20 and carrying one or more (three in the example shown in Figure 1) braking discs 2, and an element 3 rotating about the hub and connected thereto by usual bearings 4.
- the hub 1 comprises a toothing 8 which enables the discs to partially slide axially.
- the rotating element 3 comprises a first member 5 with a part 6, shown in the example in the form of a pinion for connection to a rotating member (not shown) to be braked, and a toothing 7 with which three usual braking discs 9 are engaged in an axially slidable manner.
- Both the discs 2 and the discs 9 are of usual type and advantageously comprise an outer sintered layer.
- the rotating element 3 also comprises a second member 10 of discoidal shape, rotatably connected to the first via a toothing 7 which also enables it to slide axially, so as to be able to move the discs 9 and 2 into mutual contact.
- the rotating element 3 also comprises a third annular member 11 which together with a portion of the member 10 defines a chamber 12 partly filled with loose material 23, such as metal balls.
- the device also comprises, secured to a wall 21, reaction means 13 arranged to exert on the discoidal member 10 a force such as to urge said member against the discs 9 and these latter against the discs 2, so as to maintain the pinion braked.
- the reaction means 13 comprise a piston 14 movable within a cylinder 16 housing conventional springs 15 arranged to exert an axial thrust on the discoidal member 10, such as to maintain the piston 6 braked.
- the cylinder 16 is connected via a conduit 17 to a conventional hydraulic or pneumatic system (not shown) arranged to feed into the cylinder a pressurized fluid able to exert on the piston a force counteracting that of the springs 15.
- both the member 5 and the discoidal member 10 comprise apertures 18, 19 for the circulation of oil within the rotating element 3.
- the device could also comprise a reservoir for the oil and a conventional system for forced oil circulation.
- the device is housed in the lower part of a closed box casing (partly shown) comprising the side walls 20, 21 and the base wall 22, and which upperly houses a portion of the rotary shaft of the member to be braked, this being engaged with the pinion 6 via a chain or a series of gearwheels (partly shown in the lower part of Figure 2).
- a closed box casing comprising the side walls 20, 21 and the base wall 22, and which upperly houses a portion of the rotary shaft of the member to be braked, this being engaged with the pinion 6 via a chain or a series of gearwheels (partly shown in the lower part of Figure 2).
- the mass of the material 23 can be chosen such as to obtain the desired descent speed of the load.
- Figure 2 shows a modification of the embodiment heretofore described (those parts in common with Figure 1 being indicated by the same reference numeral and not being further described).
- the modification of Figure 2 differs from the aforedescribed embodiment only in the reaction means which maintain the pinion 6 braked and the means for counteracting the action of said reaction means.
- the reaction means indicated overall by 24, comprise a piston or pin 30, coaxial to the hub 1 and arranged to slide axially within the hub which hence acts as a cylinder.
- the hub 1 is connected (as in the case of the cylinder 16 of Figure 1) to a conventional hydraulic or pneumatic system (not shown) via a conduit 17.
- the counteracting means comprise a shaft 29 rigid with the pin 30 and able to rotate coaxially to the pin 30 and to the hub 1.
- One end of the shaft 29 is connected to the pin 30 via a metal ball 31, a connecting element 32 and a spring 33.
- the ball 31 is partly housed in two hemispherical seats provided in the end of the shaft 29 and of the connecting element 32.
- the other end of the shaft is rigidly connected to a lever 34 which can be moved angularly only through a short distance as its rotation is locked by limit screws 35. To counteract the action of the spring 25, it is sufficient to rotate the lever 34 through a short distance. This also moves the ball 31, which urges the element 32 towards the spring 25 and consequently, overcoming the action of the spring 25, moves the pin 30 such that its head 26 separates from the bush 27. Consequently there no longer acts on the discoidal member 10 a force able to maintain the braking discs 2, 9 in mutual contact.
- the lever 34 can also be operated from the inside of the life-boat to be lowered, for which purpose it is necessary merely to fix a cord to the lever and pull the cord or release it during the descent of the life-boat.
- reaction means and counteracting means could be of different type from those described, or the braking discs could be positioned differently from that shown in Figures 1 and 2, for example such that the member 10 comes into contact with a disc connected to the hub 1, rather than with a disc connected to the rotating element.
- the device could moreover be provided with a plurality of springs (not shown in the drawings) acting on the outer edge of disc member 10 in such a way that the effect of the loose mass 23 on said member 10 starts only when said mass exerts a thrust greater than that exerted by said springs.
- disc member 10 and the annular member 11 should be prolonged toward the outside.
- the plurality of springs (for example three) could be arranged symmetrically between the opposite walls of the disc member 10 and the first member 5 without interfering with the discs 9 and 2. This modification is very useful in many cases when it is needed that the brakes start acting only when a certain velocity is reached.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
Description
Claims (13)
- A braking device, in particular for braking the descent of a life-boat when lowered from a ship, of the type comprising at least one pair of braking discs (2, 9), of which a first disc (2) is connected to a fixed member (1) and the other (9) is connected to a rotating member to be braked, for example a winch, and brake means (13, 24; 23) arranged to urge the discs one against the other so as to brake said rotating member, characterised in that the brake means comprise static braking means (13, 24) arranged to exert a constant thrust on the discs such as to maintain them in mutual contact and maintain the rotating member braked, means (17; 28) for at least partly counteracting the action of the static braking means and enabling the discs to be separated when it is required to enable the braking member to rotate, and dynamic braking means connected to the rotating member and comprising a loose mass (23) arranged to exert, by centrifugal effect, a thrust on the discs proportional to the rotational speed of said rotating member such as to bring the discs into mutual contact and brake the rotating member, cooling means (18, 19) being provided at least for the braking discs (2, 9).
- A braking device as claimed in claim 1, characterised by comprising a fixed central member (1) carrying a first braking disc (2) at least partly slidable along the member parallel to a longitudinal axis (L) of said member, an element (3) rotating about the longitudinal axis (L) of the fixed member and comprising a first part (6) to be connected to the rotating member to be braked, a discoidal second part (10) rotatably connected to the first and axially slidable in opposition to the static braking means (13; 24), a second braking disc (9) rotatably connected to the first part and partly slidable coaxial to the first disc (2), said second disc (9) being cooperable with said first disc (2), and a third part (11) rotatably connected to the first to define with at least one portion of said second part (10) a chamber (12) at least partly filled with the loose material (23), the static braking means (13, 24) exerting on said second part (10) a force able to maintain the first and second disc (2, 9) in mutual contact and brake the first part (6) of the rotating element (3), the means (17; 28) for counteracting the action exerted by said static braking means (13; 24) enabling the two braking discs (2, 9) to at least partly separate, consequently allowing the first part (6) to rotate.
- A device as claimed in claim 1, characterised in that the cooling means comprise a cooling circuit (18, 19) for circulating a cooling liquid at least in correspondence with the braking discs (2, 9).
- A braking device as claimed in claim 1, characterised in that the static braking means (13; 24) and the counteracting means (17; 28) exert on the braking discs (2, 9) an action in a directed coaxial to the axis of rotation of the rotating braking disc (9).
- A device as claimed in claim 1, characterised in that the static braking means are of spring type (15; 25).
- A device as claimed in claim 1, characterised in that the counteracting means (28) are of mechanical type and comprise a manually operated lever (29, 34) arranged to generate a force directed in the opposite direction to that exerted by the static braking means (24).
- A device as claimed in claim 6, characterised in that the lever (29, 34) is connected to the static braking means (24) via a ball (31) and a spring (33).
- A device as claimed in claim 6, characterised in that the lever (29, 34) is connected to a rope so as to be operable from the inside of the life-boat.
- A device as claimed in claim 2, characterised in that the static braking means (24) comprise a pin coaxial to the fixed member (1) and partly housed in said member.
- A device as claimed in claim 3, characterised by being completely immersed in the cooling liquid.
- A device as claimed in claim 3, characterised in that the cooling liquid is oil.
- A device as claimed in claim 1, characterised in that the static braking means (13) and the counteracting means (17) comprise a piston (14) movable within a cylinder (16).
- A breaking device as claimed in claim 2, characterised by comprising a plurality of springs acting on the discoidal second part (10), said springs being arranged in such a way that the effect of the loose mass (23) on said member (10) starts only when said mass exerts a thrust greater than that exerted by said springs.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT97MI001009A IT1291716B1 (en) | 1997-04-30 | 1997-04-30 | BRAKING DEVICE PARTICULARLY FOR BRAKING THE DESCENT OF A LIFEBOAT |
ITMI971009 | 1997-04-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0875448A2 true EP0875448A2 (en) | 1998-11-04 |
EP0875448A3 EP0875448A3 (en) | 1999-12-22 |
Family
ID=11377041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98107306A Withdrawn EP0875448A3 (en) | 1997-04-30 | 1998-04-22 | Braking device, particularly for braking the descent of a life-boat |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0875448A3 (en) |
IT (1) | IT1291716B1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005049474A1 (en) * | 2003-11-24 | 2005-06-02 | Tonci Zanetic | Davit winch with oil brake |
WO2010092127A1 (en) | 2009-02-13 | 2010-08-19 | Nadiro A/S | A launching system |
CN101327898B (en) * | 2007-06-18 | 2011-04-20 | 毕鉴华 | Braking drum safety device |
KR102662414B1 (en) * | 2023-10-12 | 2024-04-30 | 주식회사 제이피케이이노 | Winch brake structure |
KR102662416B1 (en) * | 2023-10-12 | 2024-04-30 | 주식회사 제이피케이이노 | Winch brake system with increased performance |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0443149A1 (en) * | 1990-02-23 | 1991-08-28 | Angelo Gambini | Centrifugal disc clutch |
EP0734995A1 (en) * | 1995-03-30 | 1996-10-02 | Nihon Biso Co., Ltd. | Rope traction device |
-
1997
- 1997-04-30 IT IT97MI001009A patent/IT1291716B1/en active IP Right Grant
-
1998
- 1998-04-22 EP EP98107306A patent/EP0875448A3/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0443149A1 (en) * | 1990-02-23 | 1991-08-28 | Angelo Gambini | Centrifugal disc clutch |
EP0734995A1 (en) * | 1995-03-30 | 1996-10-02 | Nihon Biso Co., Ltd. | Rope traction device |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005049474A1 (en) * | 2003-11-24 | 2005-06-02 | Tonci Zanetic | Davit winch with oil brake |
CN101327898B (en) * | 2007-06-18 | 2011-04-20 | 毕鉴华 | Braking drum safety device |
WO2010092127A1 (en) | 2009-02-13 | 2010-08-19 | Nadiro A/S | A launching system |
KR102662414B1 (en) * | 2023-10-12 | 2024-04-30 | 주식회사 제이피케이이노 | Winch brake structure |
KR102662416B1 (en) * | 2023-10-12 | 2024-04-30 | 주식회사 제이피케이이노 | Winch brake system with increased performance |
Also Published As
Publication number | Publication date |
---|---|
IT1291716B1 (en) | 1999-01-21 |
ITMI971009A1 (en) | 1998-10-30 |
EP0875448A3 (en) | 1999-12-22 |
ITMI971009A0 (en) | 1997-04-30 |
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