Patent Application
20190144080
The invention disclosed herein generally relates to a method for raising or lowering an object. More particularly, the invention disclosed herein relates to the method for raising or lowering a target object from a target location by means of a davit apparatus with height adjustment feature.
Davits are lifting devices generally used on marine platforms, for example, decks of ships, loading decks of ports, etc., for supporting, raising, and lowering heavy loads. These heavy loads range from lifeboats, vehicles, containers, anchors, other products, for example, tires, etc. Moreover, they are used to lift small boats. Typically, davits utilize winch assemblies to lower or raise the load. These loads can be raised or lowered only if they are positioned at a particular height. Moreover, these davits are not adjustable from the positions where they are installed, for example, on the deck of the ship. Since the height of a deck of a ship is fixed, loads positioned at low or high height level are not reachable by the davit. An apparatus, which is adjustable to handle objects positioned at varying widths and heights, is required.
An existing prior art, KR1020040016957A, discloses a davit system provided to launch a life boat from a mother ship or raise without being influenced by the pitching or rolling of the mother ship. In the disclosed invention, the davit system comprises a frame support fixed to a bottom of a mother ship loading a lifeboat, a lifting frame, a hydraulic cylinder, and a docking head part. One end of the lifting frame is coupled to an upper surface of the frame support with a hinge and rotates around a hinge shaft. The hydraulic cylinder controls the rotation angle of the lifting frame. The docking head part is coupled to a top of the lifting frame and has a plurality of dampers damping the pitching or rolling of the mother ship transmitted to the lifeboat. However, the disclosed davit system is incapable of extending or retracting the lifting frame to align the lifting frame vertically above target objects placed at different locations on a platform or vessel.
Hence, there is a long felt but unresolved need for a method for raising or lowering a target object from a target location using an apparatus, which is adjustable to handle objects positioned at varying widths and heights.
This summary is provided to introduce a selection of concepts in a simplified form that are further disclosed in the detailed description of the invention. This summary is not intended to identify key or essential inventive concepts of the claimed subject matter, nor is it intended for determining the scope of the claimed subject matter.
The present invention is related to a method for raising or lowering a target object from a target location by means of a davit apparatus with height adjustment feature. In an embodiment, the method comprises a step of providing an adjustable arm davit apparatus including, a base member, a shock absorber assembly, a boom member, an adjustable arm, a winch assembly, and a cylinder assembly. In one embodiment, the boom member comprises a first member and a second member. In one embodiment, the first member is a H-shaped member. In one embodiment, the H-shaped member is formed of a pair of legs and a connecting piece. In one embodiment, the connecting piece is disposed at a central position to connect the pair of legs. In one embodiment, the second member is a A-shaped member. In one embodiment, the first member is hingedly mounted on the base member. In one embodiment, the second member is adjustably mounted on the first member for adjustable vertical movement. In one embodiment, the cylinder assembly comprises at least two cylinders disposed at the connecting piece of the first member. In one embodiment, the at least two cylinders connects the first member and the second member. In one embodiment, the at least two cylinders is configured to provide adjustable vertical movement of the second member.
In one embodiment, hydraulic/electrical cylinder is hingedly mounted on the base member. In one embodiment, the boom member is hingedly mounted on the base member, and the hydraulic/electrical cylinder is positioned between the hinged ends of the boom member. In one embodiment, the shock absorber is hingedly mounted on the connecting piece of the first member, and is positioned between at least two cylinders. In an embodiment, the adjustable arm is slidably engaged to frontal ends of the second member through an adjustable arm housing welded to the frontal ends. In one embodiment, the winch assembly mounted at the connecting piece of the first member for supplying a cable via a plurality of pulleys positioned at predefined positions on the adjustable arm. In one embodiment, the winch assembly is mounted to the connecting piece via a bolt assembly.
In an embodiment, the method comprises another step of actuating the at least two cylinders to provide adjustable vertical movement to the second member to adjust a height of the adjustable arm davit apparatus, and to compensate for any height of the target object. In an embodiment, the method comprises another step of aligning the at least one adjustable arm directly above an attachment member on the target object. In another step, the adjustable arm is extended to centrally position over the target object to compensate for any distance of the position of the target object from the adjustable arm davit apparatus, and to compensate for any width of the target object. Further, in another step, the target object is attached to ends of the cable via a fastening member. In another step of the method, a hydraulic/electrical cylinder actuator is actuated to extend or retract the at least one adjustable arm. In another step, the shock absorber is actuated based on load of the target object to prevent overstretching of the cable. In final step, the winch assembly is actuated to raise or lower the target object from the target location. In one embodiment, the target object is a marine vessel. In another embodiment, the at least one adjustable arm is extended and retracted by a hydraulic/electrical cylinder or mechanical actuator.
The adjustable arm davit apparatus for raising or lowering a target object from a target location comprises a base member, a shock absorber assembly, a boom member, at least one adjustable arm, a winch assembly, pulleys, and a cylinder assembly. In one embodiment, the boom member comprises a first member and a second member. In one embodiment, the first member is a H-shaped member. In one embodiment, the H-shaped member is formed of a pair of legs and a connecting piece. In one embodiment, the connecting piece is disposed at a central position to connect the pair of legs. In one embodiment, the second member is a A-shaped member. In one embodiment, the first member is hingedly mounted on the base member. In one embodiment, the second member is adjustably mounted on the first member for adjustable vertical movement.
In one embodiment, the cylinder assembly comprises at least two cylinders disposed at the connecting piece of the first member. In one embodiment, the at least two cylinders connects the first member and the second member. In one embodiment, the at least two cylinders is configured to provide adjustable vertical movement of the second member. In one embodiment, the shock assembly member comprises a hydraulic/electrical cylinder and a shock absorber. In one embodiment, the hydraulic/electrical cylinder is hingedly mounted on the base member. In one embodiment, the boom member is hingedly mounted on the base member, and the hydraulic/electrical cylinder is positioned between the hinged ends of the boom member. In one embodiment, the shock absorber is hingedly mounted on the connecting piece of the first member, and is positioned between at least two cylinders.
The hydraulic/electrical cylinder is configured to extend and retract. A retraction of the hydraulic/electrical cylinder actuates the boom member in a position substantially inclined to the base member. An extension of the hydraulic/electrical cylinder actuates the boom member in a position substantially perpendicular to the base member. The adjustable arm is slidably engaged to frontal ends of the second member. The adjustable arm is configured to slide in a forward direction or a reverse direction by a hydraulic actuator or electric actuator. The winch assembly is positioned at the connecting piece of the first member for supplying a cable via a plurality of pulleys positioned at predefined positions on the adjustable arm. The shock absorber extends or retracts based on load of the target object on the cable to prevent overstretching of the cable. The pulleys collectively transfer the cable for raising or lowering the target object from the target location.
The foregoing summary, as well as the following detailed description of the invention, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the invention, exemplary constructions of the invention are shown in the drawings. However, the invention is not limited to the specific methods and structures disclosed herein. The description of a method step or a structure referenced by a numeral in a drawing is applicable to the description of that method step or structure shown by that same numeral in any subsequent drawing herein.
In one embodiment, the apparatus 100 comprises a cylinder assembly 118 comprises at least two cylinders disposed at the connecting piece 116 of the first member 112. In one embodiment, the cylindrical assembly 118 connects the first member 112 and the second member 114. In one embodiment, the at least two cylinders of the cylinder assembly 118 is configured to provide adjustable vertical movement of the second member 114. In one embodiment, the at least two cylinders is at least one of a hydraulic cylinder, mechanical cylinder or pneumatic cylinder
In one embodiment, the adjustable arm davit apparatus 100 for raising or lowering a target object 101 from a target location comprises the base member 102, a hydraulic/electrical cylinder 103, the shock absorber 120, the cylinder assembly 118, boom member 104, at least one adjustable arm 105, the winch assembly 106, and pulleys 108 as illustrated in
In an embodiment, a hydraulic pump regulates pressurized hydraulic fluid flow in the hydraulic circuit supplying hydraulic fluid to the hydraulic/electrical cylinder 103. Based on the supply of the hydraulic fluid, for example, oil, etc., to the hydraulic/electrical cylinder 103, the piston either extends or retracts. The hydraulic/electrical cylinder 103 is positioned between hinged ends 104a and 104b of the boom member 104. A retraction of the hydraulic/electrical cylinder 103 actuates the boom member 104 in a position substantially inclined to the base member 102. An extension of the hydraulic/electrical cylinder 103 actuates the boom member 104 in a position substantially perpendicular to the base member 102. The hydraulic/electrical cylinder 103 based on the application requirement of the adjustable arm davit apparatus 100. The adjustable arm 105 is seated in an adjustable arm housing 105a as exemplarily illustrated in
A hydraulic actuator 110 or an electric actuator 110 is used to retract or extend the adjustable arm 105. The hydraulic actuator 110 or electric actuator 110 is a piston-cylinder arrangement. The piston slides within the cylinder to extend or retract the adjustable arm 105 as exemplarily illustrated in
The foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the adjustable arm davit apparatus 100, disclosed herein. While the adjustable arm davit apparatus 100 has been described with reference to various embodiments, it is understood that the words, which have been used herein, are words of description and illustration, rather than words of limitation. Further, although the adjustable arm davit apparatus 100 has been described herein with reference to particular means, materials, and embodiments, the adjustable arm davit apparatus 100 is not intended to be limited to the particulars disclosed herein; rather, the adjustable arm davit apparatus 100 extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims. Those skilled in the art, having the benefit of the teachings of this specification, may affect numerous modifications thereto and changes may be made without departing from the scope of the adjustable arm davit apparatus 100 disclosed herein in their aspects.
