Abstract: A lift system includes an overhead support, a counterweight, a base unit including a brake and secured to a floor, a fly line, and a load line. The fly line connects the counterweight, the overhead support, and the base unit via pulleys. The brake is configured to engage the fly line to limit movement of the counterweight and a load. A manual rope brake includes a housing having a base portion, an upper portion, and a hinge rotatably connecting the upper portion to the base portion. A cam lock is within the housing between pulleys. The cam lock engages a rope when the brake is engaged, and disengages from the rope when the brake is disengaged. A portable lift system includes a container configured to carry pulleys, a base unit, a fly line, and a load line when the lift system is in transport. Related methods are also disclosed.

Abstract: A load indicator for use with a fall protection apparatus having a line and a connector for connecting to a user includes a housing having a pass-through opening and a covered indicator region. At least a portion of the housing is configured for connecting to the line. The load indicator also includes a shear pin supported by the housing and extending across the pass-through opening, and a saddle extending across at least a portion of the pass-through opening and supported by at least a portion of the shear pin. The saddle is configured for connecting to at least a portion of the connector. The saddle is movable relative to the housing between a first position and a second position when a force exceeding a predetermined threshold value is applied on the saddle causing the shear pin to shear or break. At least a portion of the indicator region is uncovered in the second position of the saddle when the shear pin shears or breaks.

Abstract: Disclosed is a fairlead intended to engage with an anchor chain, for a system for anchoring a floating installation to the ground. The fairlead includes two structures assembled by pivot connection of axis, one upstream, for rigidly connecting the fairlead to the floating installation, and the other downstream, including—a unit for blocking the translational movement of the anchor chain, and—a guide, for guiding a change in direction of the anchor chain. Furthermore, the downstream structure includes two lateral plates delimiting the passage of the chain, the upstream end of each of the plates including a U-shaped bearing receiving an additional arm of the upstream structure and engaging together via a journal, the guide extending between the internal branches of the two bearings.

Abstract: A portable lighting device includes a body, a lighting unit supported by the body, and a terminal block supported by the body. The terminal block is configured to connect to a power source and provide electrical energy to the lighting unit to illuminate a light emitting diode. The portable lighting device also includes a hanging cable configured to hang the body from a support structure. The hanging cable has a first end secured to the body and a second end portion opposite the first end. The portable lighting device further includes a cable clamp mechanism supported by the body. The cable clamp mechanism engages the second end portion of the hanging cable to allow adjustment of a length of the hanging cable between the first end and the cable clamp mechanism.

Abstract: A towing device, intended to be fitted to the deck of a ship, comprises a winch, a cable and a fairlead, the cable running through the fairlead under the action of the winch. The fairlead comprises at least a first and a second sector, the sectors allowing the cable to be guided in a groove made in each of the sectors, a first articulation with a degree of freedom to rotate about an axis, the articulation connecting the two sectors, the axis being substantially perpendicular to a direction in which the cable runs substantially through the fairlead at the articulation, and limiting means that limit the angular travel of the articulation. The sectors and the limiting means are dimensioned so as to prevent the cable from exceeding a lower limit of radius of curvature.

Abstract: The instant invention is a cam cleat assembly that includes a base member, two removably mounted spindle pins and two rotationally mounted cam members having teeth for gripping rope, sails, twine cord or the like. The base plate includes a smooth transitioning ramp surface that allows for increased angular interaction with a rope or line member. The base plate also includes a pair of pockets sized to cooperate with the removable spindles for alignment and a more secure placement under heavy loads to minimize deflection of the spindles and thus the cam members. Removable and replaceable spindle pins are provided to allow easy replacement for extended life of the device. Seals are provided around the fasteners to allow quick and accurate reassembly while maintaining a watertight assembly to prevent the ingress of salt and/or water into the assembly from the mounting surface.

Abstract: A seal housing body, extruded AL or molded plastic or metal, has cavity portions communicating through an interface region formed by one at least one frangible projection protruding from the first body into the cavity, a first cavity portion for receiving a locking body, the second cavity portion forming a shackle receiving passageway. The locking body has a channel inclined relative to and in communication with the passageway. A spring in the channel urges a shackle locking ball up the channel partially into the interface region, the ball, having a diameter sufficient to pass through the passageway, is captured in the channel by the at least one projection. The locking body has indicia and/or flanges, at one or both opposing ends, to provide tampering evidence. The channel is offset from the locking body's central plane forming a single channel side wall to preclude trapping the ball by tampering.

Abstract: A tow line controlling device and a method of operation of a tow line controlling device in which the tow line controlling device is positioned in a deck of a vessel. The tow line controlling device includes at least two vertical tow pins that are movable between a passive position and at least one active position, and includes a gap between two of the tow pins, and the gap is spanned by a bridge formed by the two tow pins at least when the tow pins are in one of their active positions. The tow line controlling device also includes a lower stopper that is movable between a passive position and at least one active position and is positioned between two of the tow pins.

Abstract: A rope stopper system for a fibre rope (30) is described, where a rope stopper (10) is placed on a deck of an anchor handling vessel (50) or the like, and is arranged to grip and secure the fibre rope (30), that runs through the rope stopper (10), in connection with reshackling and the like.

Abstract: A cleat deck includes a body for attachment to a tubular body and a platform attached to the body and having a face for supporting a cleat. A fairlead extends upward and rearward from the face such that the fairlead extends rearward of an adjacent portion of the body to extend into an interior of the tubular body, through a slot in the tubular body. The fairlead has a surface configured for guiding a line between an interior and an exterior of the tubular body.

Abstract: A mooring system for offshore vessels uses a chain stopper within a preset mooring line. The chain stopper has means for attaching a removable hydraulic chain jack actuator which may be used to stroke the chain through the stopper assembly while both the stopper and the mooring line remain under load.

Abstract: A device for securing a length of rope includes a housing with at least one pair of apertures therein defining a passage through the housing for receiving a line of rope. The device includes a pin extending at least partially through the interior of the housing, and a torsion spring disposed within the housing. The device further includes at least one cam member with a grooved edge portion, pivotally mounted on the pin and biased by the torsion spring so as to pivot the cam member's grooved edge portion in a direction towards an interior wall of the housing for engaging a line of rope received within the passage between the cam member's grooved edge portion and the interior wall. The at least one cam member has a lever depending from the cam member, which enables pivotal movement of the cam.

Abstract: The vessel control device disclosed herein comprises a channel-mounted, spring-loaded eyebolt that trails a floating line. It also embodies a latch mechanism, a cable release device and an electrical switch. By the action of grabbing the line the man overboard victim (MOB) can stop the vessel by himself; then use the line to reboard.

Abstract: A fast looping-up and releasing rope loop assembly includes two one-way locking devices, at least one band, and a buckle. The one-way locking device includes a body constituted by a base and a cover. The one-way locking device allows the pull rope to extend therethrough and to move with respect thereto along a single direction. By inserting the pull rope through a rope entry opening of the base of the one-way locking device and further extending the rope around a rotary disk and a rotary wheel arranged inside the locking device and extending out of the locking device, the one-way locking device that locks the movement of the rope in an opposite direction is completed. When the rope is jammed due to excessive tightening, a presser of the buckle is depressed to release the one-way locking device from the jamming condition so that efficient loop-up and release can be realized.

Abstract: A system is described for handling a wire, a chain, a cable, etc. (12) onboard a vessel, comprising a number of winches (10) to pull in and let out said wire, chain, etc. (12), and also a number of tow pins (14) and shark jaws (16), mounted in an area at the stern of the vessel, and which is arranged to guide and/or to hold said wire, chain, etc. (12) that runs from or to said winches (10). The system further comprises at least one centering device (18) arranged between said tow pins (14) and shark jaws (16) and winches (10), preferably adjoining said tow pins (14) and shark jaws (16), where the centering device (18) comprises at least two guiding plates (20) that can be raised and lowered and which are arranged to guide and possibly to hold said wire, chain, etc. (12).

Abstract: A stopper device (1) for chain (2) or wire, especially for locking in position an anchor chain, tow wire or mooring wire, wherein the stopper consists of a pair of plates (3, 4) which can be pivoted up from the deck of a ship to be vertically positioned in a locked position relative to the deck, so that the plates (3, 4) form an angle (?) relative to each other and with a gap (6) between an area of adjacent plate edges (3?; 4?) on the pair of plates, wherein the gap is configured to match the thickness (t) of a chain link or a wire, wherein the pivoting movement of each plate is provided with the aid of a jack (7) in cooperation with a link mechanism (8; 9), and wherein the link mechanism (8; 9) in one end position causes a locking of the plate (3; 4) in the vertical position. A first (10) of the links in the link mechanism has an abutment area (11) designed to cooperate with a controllable, reciprocating locking bolt (121) for locking the first link (10) and thus the link mechanism in said one end position.

Abstract: Dynamic motion decoupling and damping is achieved with the use of mass, added mass, buoyancy, submerged weight and drag in arbitrary locations on catenary and/or tensioned lines. The original line configuration may or may not be modified. Novel, drag and added mass enhancing devices effective in all directions can be used to increase the suppression effectiveness and/or in order to reduce the number of devices used. This invention is suitable for use on new designs and it is also suitable for retrofitting on existing, already installed lines.

Abstract: Device for a tow pin to lead a cable, such as a chain, wire, hawser, etc., onboard a vessel, comprising a number of cylinders that can be hoisted and lowered, where each of the cylinders comprises a rotary stopping element, facing each other, to prevent that the cable runs out of the tow pin. Said stopping element can be turned outwards with the help of a piston arrangement arranged in the cylinder, and that the stopping element can be turned outwards in the whole of the working area of the tow pin.

Abstract: There is disclosed, apparatus for securing a mooring line (5) of a vessel, the mooring line having an eye (6), said apparatus comprising a hook (10) around which the eye (6) of the mooring line (5) can be secured, the hook (10) having a pair of hook members (11a, 11b) defining a gap therebetween, and guide means (15, 17, 9) configured to guide a heaving line attached to said eye along a path which passes through said gap whereby when said heaving line heaves the eye past the hook, the eye locates over the hook.

Abstract: A hook seat tightening structure for ship covers comprises a body constituted by a seat and a housing, wherein two rollers, one turntable, one wheel, one lock bolt, and one lock member are located therein. A depressing piece and a tenon are located at two sides of the lock bolt respectively. The lock bolt can be rotated and elastically restored by the tenon, which is connected with a spring. The depressing piece is pressed against one-way ratchets on the turntable, and the lock bolt can be rotated subject to a control by a key. A rope enters and is reeved on the turntable and wheel, to constitute a tightening device permitting a one-way gliding of the rope. Accordingly, when the lock member is locked by rotating the key, the tenon on the lock member can be latched on the depressing piece of the lock bolt, thereby achieving a locking function.

Abstract: An adjustable pulley device which resides on a boat's anchor rope, which, when the anchor has been set offshore, allows an operator to pull the boat from shore to a pre-determined point on the anchor rope, and retrieve it. It comprises a housing with an integral pulley sheave and rope arresting mechanism in conjunction with a snap shackle which is tethered to the boat. To use the device, the snap shackle is snapped around the anchor rope between the sheave and the arresting mechanism on the device. As the boat approaches the shore, the anchor is put over side, and with the anchor set, the anchor rope slides through the device and shackle until the arresting mechanism is actuated. The device, now attached to the anchor rope, becomes the turning block which in conjunction with the shackle make up a pulley system to move the boat to and from shore.

Abstract: A device stops and retains a clamp on a wire. The device is mounted above a surface, which is preferably a deck of a vessel. The device comprises a fork that can engage with the clamp. The fork has a pair of teeth defining an opening therebetween, and the opening has a bottom. The fork has a first effective locking height defined between the bottom and the surface and height intended for retaining a wire lying within a first size range. The fork also has a second effective locking height defined above the surface and intended for retaining a wire lying within a second size range which is smaller than said first size range. The second locking height is greater than the first locking height, relative to the surface. The fork includes at least one guide member for mounting and securing an insert, preferably U-shaped, in the opening between the fork teeth, said insert having a bottom defining said second locking height. Optionally, the fork teeth have holes through which a locking bolt can be inserted.

Abstract: The line jammer device is a device for jamming a line which is under tension upstream of the device when it is in a locked state and releasing the line when it is in an unlocked state. The device has a first line gripping member and a second line gripping member. The first line gripping member has a circular surface around which the line is wound between a fraction of a turn corresponding to an angle of more than 180° and at least one turn. The second line gripping member is arranged in such a way that the grip it exerts on the line is exerted once the line has been wrapped around the first gripping member between a fraction of a turn corresponding to an angle of at least 180° and at least one turn.

Abstract: A pulley- or roller-type block is provided with a lock arrangement. The block has a casing and a rolling unit mounted in the casing for clockwise and counterclockwise rolling. The rolling unit has a circumferential ring portion including a line-bearing surface whereby. In use the line is allowed to transit partially around the rolling unit as the rolling unit passively rolls clockwise or counterclockwise in response to alternate-direction transit of the line. The lock arrangement has a line-contacting portion operative between locking and unlocked extreme positions, and an operator for operating the strand-contacting portion. Wherein, because of the risk of forming a permanent weak spot in the line under highly concentrated locking contact, either .cndot. the circumferential ring portion of the rolling unit, including the strand-bearing surface thereof, or .cndot. the strand-contacting portion of the locking arrangement is formed from the following:--ie.

Abstract: A device on board a vessel for stopping and retaining either a link (2", 11") in a chain (2; 11) or a clamp on a wire, where the chain or wire is intended to be extended between the vessel and, e.g., an anchor, comprising a grip and stop fork (1) which is designed such that it may be brought up through the vessel deck (6) to engage with said chain link or wire clamp, and where the opening between the outer section of the fork teeth (1', 1") may optionally be closed off with a locking bolt or similar means. The fork (1) has a first, effective locking height (h.sub.1) above the deck of the vessel, defined by the bottom (14) of the opening between the fork teeth and intended for a chain (2) lying within a first size range, and a second, effective locking height (h.sub.2) above the vessel deck intended for chain (11) or wire lying within a second, smaller size range, said second locking height (h.sub.2) being greater than said first locking height (h.sub.1).

Abstract: This runaway halyard preventer has a relatively small, elongated stop body that has one of its ends pivotally attached to the mast below the halyard pulley, while its other end is cantilevered. The stop body includes a walled passageway, located near the pivoted end, through which the halyard is passed. Whenever the halyard is under tension, the force it exerts on the stop body readily moves the stop body to a first position in which the halyard is able to run freely through the stop body in either direction. However, whenever the halyard is not under tension, a slight biasing force moves the pivoted stop body to a second position in which its passageway walls create sufficient frictional resistance to prevent movement of the halyard in either direction. Preferably, the weight of the cantilever end provides appropriate force for biasing the pivoted stop body toward its second position.

Abstract: A boat anchoring apparatus according to the invention has an elongate rod with a planar end piece attached at one end thereof for driving vertically into the sand or soil on a beach or waterfront. The rod is driven into the beach using a driving device having a weighted closed end with hollow tube for placement over the rod and having an elongate aperture along the length of the tube with a securing pin for attachment to the rod for pulling the rod out of the soil. Attached to the driving device is a pawl actuating mechanism for securing a line from the boat to said pawl when the rod is vertically in the soil and one end of the driving device is slidingly secured over the vertical rod locking at 90 degrees detaining forward tilt of buried rod and maximizing horizontal direction of vector forces.

Abstract: A split block cable stopper comprises several split blocks (FIG. 1) each defining a bore (3, 3A) whose diameter normal to the split is slightly less than the diameter of the cable being handled. The split blocks are pivotally mounted so that they can be moved away from the cable axis to enable a repeater or joint housing to pass freely through the cable stopper.

Abstract: A camming cleat for securing a length of line or rope to a boat or other such object, with the camming cleat being designed to simultaneously retain and hold one or a pair of lines in cleated relationship. The device includes a generally conically arranged base plate with a pair of rope receiving slots formed chordally therewithin and having a spring-biased camming plate disposed and received coaxially within the base plate and arranged for rotation relative to the plate. The camming plate is provided with a pair of generally "U" shaped channels each with a profiled depth which decreases as the camming radius increases, and furthermore may be provided with retainer prongs which are curved arcuately in a direction so as to be more generally normal to the axis of the cleated rope.

Abstract: The invention is a device for tensioning and locking an attachable subject comprising in combination a toggle clamp and a snag proof quick release pin channel lock.

Abstract: A cable grip device, known as a "stopper", suitable for holding submarine cables during laying and recovery operations on board a ship, comprises a conventional helically wound stopper modified to have a low coefficient of friction over an internal surface portion (1A) and a higher coefficient of friction portion over a surface (1B), which it is found enhances the tensile load which the stopper can bear particularly when used for smooth surfaced deep water submarine cables.

Abstract: A dual position cam cleat for use principally on small sailing boats and crafts for maintaining the sail ropes taut. The dual position cam cleat comprises a pair of serrated jaws to grip the rope in either direction. The dual jaws are positioned side-by-side and displaced approximately 90.degree. to 120.degree. apart and mutually pivotable about a common point to either direction. The jaws in a crossdirection comprise a serrated and a non-serrated portion. The non-serrated and smooth portion permits rope slippage for adjusting the tension without movement of the cam cleat. The dual cam cleat is shifted from the one gripping jaw to the other by the sailor vertically jerking the line. A spring means connected between the pivot point and the support member maintains the one jaw in an active position and the other jaw in a passive condition and offers a "crisp" toggling or snapping action when reversing the tension members. A swivel base permits the entire dual structure to be swiveled to any angle within 180.

Abstract: Retractable tow line guide pins (1 and 2) at the stern of a tugboat or supply boat are made to be elevated from/retracted into the deck (3) of the vessel and are also pivotable, such that over a portion of the raising or lowering movement they are pivoted 90.degree., whereby fixed locking members (4,5) mounted thereon and the pins themselves pivot from an inoperative position into a position in which the opening between the pins (1 and 2) is closed at the top, thereby preventing a tow line disposed in the opening between the pins from being released therefrom.

Abstract: A halyard stopper for a sailboat includes a pair of spaced-apart side plates extending up from a base. A jamming arm in the form of a class two lever is pivotally mounted between the plates above the base adjacent the entrance end of the stopper so that the arm can be swung from a jamming position wherein its free end is disposed close to the base and a nonjamming position wherein its free end is spaced further away from the base. A class one lever pivotally mounted between the side plates adjacent the exit end of the stopper is swingable so as to engage the free end of the arm and move the arm from its jamming to its nonjamming position even though the arm is under a very large jamming load.

Abstract: A stop assembly on a vessel for securing a buoy line connecting a mooring anchor and an associated buoy, comprising at least one fork-shaped stop member which is mounted so as to be raised up from and lowered down into the deck of a ship and which can be remote-controlled from a command location, the opening between the arms of the fork being wide enough to provide room for the buoy line, but narrow enough that an expansion on the line, for example, a swage sleeve, rope wire thimble or the like will be restrained so that the line is securely locked in position.

Abstract: A sail line stopper is provided for controlling the hoisting and trimming of sails in which the line may be released under heavy load without abrading the line so released. A U-shaped base member having legs with a pivot pin mounted therein is adapted to be anchored on a sailboat. A cam mechanism includes an inner element having a handle attached thereto which is eccentrically mounted for pivotal movement around the pivot pin. A movable outer element is positioned for pivotal movement and a rotational movement on the eccentrically mounted inner element. One or more springs are mounted between the inner and outer elements of the cam mechanism which are acted on when relative movement takes place between the elements. The spring is compressed when the handle is pivoted placing the outer member in locking engagement with the line in the load direction which locking action is increased with increasing load; while allowing the outer member to rotate or float over the line in the other direction.

Abstract: A fluid activated cable locking device for cable, chain, wire, tow etc. particularly for securing an anchor chain, pendant wire or the like on board a marine vessel, comprising a preferably cylindrical housing, in which housing a preferably hydraulic jack is arranged substantially axially, said jack having a cylinder rigidly connected with the housing, and a piston rod connected with a jaw means having a pair of locking jaws that are moved towards/from one another by extracting/withdrawing the piston rod from/into the jack cylinder. The housing with the jaw means and the jack is mounted vertically displaceable in a correspondingly shaped cylindrical well, such as in a vessel deck structure. The vertical displacing movement is carried out by means of additional jack means connected between the jaw housing and the deck structure so the locking jaw means can be stored under the deck lever when not in use.

Abstract: A cleat formed with an improved rope-engaging surface adapted to facilitate the engagement of a rope and its subsequent release from the cleat. The rope-engaging surface is formed with a first stage raked and slanted teeth structure that tends to be self-feeding for engagement of the rope by the cleat. A second stage raked and slanted teeth structure tends to hold the rope secure within the cleat and also facilitates release of the rope from the cleat. The first and second stage teeth structures are joined by a transitional, curved teeth structure that permits continuous feeding into or release of the rope from the cleat. The teeth structure defined is useful in all types of cleats such as cam cleats, fixed jaw jam cleats, and sliding jaw jam cleats.

Abstract: A device for engaging and disengaging a line comprising a pair of pivotal arms turnable to an upright position and to a horizontal position and supported at a location close to a line engaging bitt opposed to and a distance away from a line guiding member, a pressing traverse arm extending between the free ends of the pivotal arms, a disengaging traverse arm extending between intermediate portions of the pivotal arms for disengaging the line from the bitt, apparatus for turning the pivotal arms to the upright position and to the horizontal position, and a pressing bed positioned to oppose the pressing traverse arm when the pivotal arms are turned to the horizontal position, the disengaging traverse arm being positionable above the bitt when the pivotal arms are in the upright position, the traverse arms and the pivotal arms defining a space for inserting the line therethrough. The line can be engaged with and disengaged from the bitt or bollard easily and properly.

Abstract: A fail-safe guy line system for marine structures. In the event of cable failure near the water surface, a braking device, such as a cable clamp, can be wedged into a sheave or fairlead to prevent loss of the guy line.

Abstract: Cleat has a base for mounting on deck or dock, with cleat head pivotably mounted to rock on the base. The horns on the head coact with the base to reliably and releaseably clamp line therebetween for secure cleating of the line. The spacing between the horns and the base is adjustable by adjustment of the pivot axis of the head on the base.

Abstract: A method for snubbing or restraining a cable. A cable is threaded through a sleeve which has brush bristle-like elements extending from the sleeve wall inwardly towards the center of the sleeve. The ends of the bristle-like elements are placed in contact with the surface of a portion of the cable and the frictional force resulting from the movement of the cable in contact with the bristle-like elements restrains movement of the cable through the sleeve.

Abstract: A rope holding device including an improved cam cleat useful on a sailboat for maintaining sail ropes taut. The improved cam cleat contains two cam-type jaws to grip the rope, one of which has a serrated or tooth-like surface for gripping, while the other has a smooth gripping surface which permits easy rotation of the smooth cam member to the release position. The smooth cam member has an arcuate face with a radius of curvature for the gripping surface substantially greater than the smooth face of the release surface adjacent it. Consequently, when the smooth release cam is pivoted so that the retained rope is slipped from the smooth gripping surface to the smooth release surface, the rope is automatically released without the need for the operator to exert a force on the rope to pull it away from the cam cleat as is usually done.

Abstract: By grasping a steel cable with a low cost portable self-tightening clamp that increases its holding force as the tensile pull force increases, one man can tighten steel cables of various lengths having bitter ends by using temporarily a single portable ratchet jack assembly to exert about 20 tons (20,000 KG) tightening force. Two similarly acting inexpensive clamps affixed to a barge deck hold the cable lines of various lengths without eyes in the end taut enough to bind barges together into one stiff unitary assembly, and permits the single ratchet (and portable clamp) assembly to be reused, thereby significantly reducing equipment inventory and cost.

Abstract: A traveler for a sailboat having a track way and a traveler car moving to and fro along the track way and attachments on the traveler for attaching control ropes on either side thereof for controlling the position thereof from either side of the sailboat, and cleats on either side of the traveler for fastening the control ropes on either side thereof, and cleat releasers on the traveler car, being movable relative to the cleats, and being operable in response to movement of the traveler car to release the cleats on one side of the traveler, while leaving the cleats on the other side of the traveler undisturbed. Also disclosed is a cam cleat having a cam cleat releaser movable relative thereto for opening of the cam cleat from a remote location.

Abstract: A device for clamping and stopping elongated objects. The device encompasses a passage adapted to receive at least a section of an elongated object to be stopped. Two jaws are located on both sides of this passage and are associated with a mounting arrangement to displace the jaws toward and away from the section for insertion of the elongated object and to clamp and release it. The device is a cable stopper in which the jaws catch and stop a cable led through the passage.

Abstract: A self-locking cable trolley having a body member which guidingly receives a cable on which the body member rides and a length of working line that permits control of the body member on the cable. Disposed on the body member is a lock device which grips the supporting cable when the working line is manipulated in a predetermined manner so as to cooperate with a control surface also provided on the body member and swing the lock device into engagement with the cable in order to selectively retain the body member of the trolley at a desired location on the cable.

Abstract: A hook seat tightening structure for ship covers comprises a body constituted by a seat and a housing, wherein two rollers, one turntable, one wheel, one lock bolt, and one lock member are located therein. A depressing piece and a tenon are located at two sides of the lock bolt respectively. The lock bolt can be rotated and elastically restored by the tenon, which is connected with a spring. The depressing piece is pressed against one-way ratchets on the turntable, and the lock bolt can be rotated subject to a control by a key. A rope enters and is reeved on the turntable and wheel, to constitute a tightening device permitting a one-way gliding of the rope. Accordingly, when the lock member is locked by rotating the key, the tenon on the lock member can be latched on the depressing piece of the lock bolt, thereby achieving a locking function.