Abstract: A latching structure of a mobile electronic device includes a button module, at least one lock pin, at least one linking rod, and at least one hook module respectively disposed in a base and a display of the mobile electronic device. One end of the linking rod is coupled to the button module and another end of the linking rod is coupled to the hook module. When the button module is pressed, the button module drives the linking rod to force the hook module to release the lock pin so as to allow the user opening the display from the base of the mobile electronic device.

Abstract: A fastening structure for portable electronic device includes a cover, a main body and a latching member. The cover includes a hook. The main body defines a receiving cavity. The latching member is attached to the main body. The latching member includes a locking portion received in the receiving cavity. The cover is locked on the main body by engagement between the hook and the locking portion.

Abstract: A latching overlay for a tool storage unit drawer includes a drawer pull with a substantially horizontal flange portion perpendicular to a front face of the drawer and extending across at least a portion of the drawer width. In a preferred embodiment, the latching overlay includes a trim channel having a first surface for engaging a top face of the horizontal flange portion of the drawer pull, a second surface for engaging a bottom face of the horizontal flange portion of the drawer pull, and a release connected between the first surface and the second surface such that the trim channel is capable of pivoting about the horizontal flange portion. At least one drawer latch hook connected to the trim channel is provided, wherein the drawer latch hook engages and disengages from a latching component of the tool storage unit in response to the pivoting movement of the trim channel.

Abstract: A dual-hook latch formed on a housing of an electronic device includes an arm and two protrusions. The arm protrudes from the housing and defines an opening therein. The two protrusions are formed at opposite sides of the arm. The two protrusions are arranged at an end of the opening. The widths of the two protrusions are smaller than that of the opening.

Abstract: A system and method for locking a door. An assembly has a first engagement surface. A door is coupled to the assembly, the door including a latch member having a second engagement surface for engaging the first engagement surface. A movable member is capable of generating a force against at least one of the assembly and the door to press together and substantially prevent disengagement of the first engagement surface and the second engagement surface.

Abstract: A latch assembly includes a plate and an arm pivotable between a closed and an open position relative to the plate about a pivot axis. The pivot axis is substantially aligned with a line of entry of a connecting bar to a latched position in which, when the arm is in the closed position, the connecting bar is entirely surrounded by both the plate and the arm together and partially surrounded by the arm and the plate individually. The plate is fixed relative to the line of entry.

Abstract: A lock arrangement comprises a first jaw component (28) pivotally moveable about a pivot axis (12), a second jaw component (30) releasably securable to the first jaw component (28) to form a pivotable jaw assembly (10), and an actuator arrangement operable to drive the jaw assembly from a locked position to a released position.

Abstract: A computer enclosure includes a housing, a cover, a lock rod and an operating member. The housing includes an upper plate and a bottom plate opposite to the upper plate, with two protruding bars respectively formed on opposite inner surfaces of the upper plate and the bottom plate. Each protruding bar forms a latch hook and defines a notch. The cover forms a limiting portion defining a receiving groove. The lock rod is moveably received in the receiving groove. The operating member is slidably assembled onto the cover and fixed to the lock rod. The operating member is capable of moving the lock rod to pass through the notch and latch to or detach from the latch hook, such that the cover can be assembled onto or disassembled from the housing.

Abstract: A cover latching assembly includes a housing, a releasing assembly and a cover. The housing includes an upper board, a side board extending from the upper board and an assembling portion disposed on the upper board communicating with the side board through a hole. The cover is detachably mounted on the housing and includes an upper wall and a peripheral wall. The peripheral wall has a notch defined therethrough corresponding to the hole; the upper wall has a latching hook formed thereon adjacent to the notch. The releasing assembly is releasably assembled within the accommodating portion of the housing through the hole and partially accommodated within the hole for releasably latching with the latching hook of the cover.

Abstract: Articles and methods for installing hook bolts on bridge decks constructed of timbers and structural steel members. A tether is lowered through a hole in a timber, captured below the bridge deck, and drawn upward around the timber or between timbers. A hook bolt is engaged with the end of the tether that was lowered through the hole and drawn upward, then lowered under the bridge deck and drawn upward through the hole in the timber. The hook bolt engages with a flange on a structural member of the bridge deck.

Abstract: A locking device for an aircraft door in a fuselage section of an aircraft includes at least one fuselage fitting disposed in a region of a sill of the fuselage section and at least one door fitting disposed in a region of a lower edge of the aircraft door and corresponding in number to the at least one fuselage fitting. The at least one fuselage fitting and the at least one door fitting are each configured to transfer at least one of a circumferential load and a radial load.

Abstract: In a locking device for the bonnet of a motor vehicle, a guide device is arranged on the bonnet, whereby an element of the lock that consists of the locking hook and clip is in engagement with the guide device, and whereby when the bonnet is closed and locked, the latter can be displaced relative to the locking hook and the clip via the guide device.

Abstract: A juvenile product includes a frame with a rail, the rail including first and second rail sections, a latch assembly coupling the first and second rail sections and configured to reside in a latched state for an in-use orientation of the rail, and an elastic bias element coupled to the first rail section or the second rail section and configured to be under tension in or near the in-use orientation such that the elastic bias element drives the rail away from the in-use orientation when the rail is near the in-use orientation with the latch assembly not in the latched state.

Abstract: The releasable locking arrangement for two components consists of a hook-connecting element arranged on a first component (10) and a spring-loaded locking hook (26) with swivelling axis (22) arranged on a second component (20). The locking hook (21) and the hook-connecting element can be connected with one another to form the lock. The hook-connecting element on the first component (10) is a retaining rod (11) whose ends are movable in a guide track (12, 12?). The swivelling axis (22) of the locking hook (21) on the second component (20) is connected with a holder (27). The holder (27) has a sliding bevel (24-S, 25-S) for the retaining rod (11). When the two components (10, 20) approach one another, the retaining rod (11) slides upwards on the sliding bevel (24-S, 25-S) of the holder. This causes the retaining rod to move in its guide track (12, 12?) at the same time.

Abstract: A latch for releasably sealing a box, the latch comprising a first part and a second part arranged to be attached to respective opposing flaps of a box lid, the first and second parts comprising respective first and second attachment elements arranged to releasably engage one another thereby to seal the box, wherein the latch is elongate and the attachment elements have a substantially uniform cross-section along their length.

Abstract: An electronic device includes a body, a cover, and a latch mechanism. The latch mechanism is configured for latching the cover to the body, and unlatching the cover from the body. The latch mechanism includes a fastening portion, and a latching portion. The fastening portion and the latching portion are installed in the cover and the body correspondingly. The fastening portion is operatively engageable with the latching portion for cooperatively latching the cover to the body. When the cover is latched to the body, the latching portion extends out of the cover and engages with the fastening portion, and when the cover is unlatched from the body, the latching portion disengages with the fastening portion and is retracted in the cover.

Abstract: A vent assembly has a locking mechanism to retain its cover on its base. The locking mechanism includes a latch and linkage coupled with the latch to move the latch between a locked and an unlocked position. A post member extends from the cover to cooperate with the latch such that in a locked condition, the cover is locked with the base in a closed position. When the latch is moved to a second position, the cover is enabled to pivot away from the base to an open position.

Abstract: A motorized oven latch includes a base plate. A latch member is slidably connected to the base plate by a first mounting stud or first and second mounting studs connected to the latch member and located in a contoured slot defined in the base plate. The latch member includes an inner end and an outer end, and the outer end includes a hook adapted to engage an oven door. A motor is drivingly coupled to the latch member, and the motor is selectively operative to move the latch member forward and rearward relative to said base plate between a locked position and an unlocked position, wherein the latch member moves on a non-linear path relative to the base plate in response to movement of the first mounting stud or both the first and second mounting studs in the contoured slot when the motor moves the latch member forward to the unlocked position or rearward to the locked position.

Abstract: A latching device and an electronic device using the latching device are provided. The latching device is for fastening a cover assembly of the electronic device to a base assembly. The latching device includes a sliding member movably mounted in the cover assembly, a magnet fixed in the sliding member, and a hooking member pivotally fixing on the base assembly. The hooking member is made up of magnetic material. When the cover assembly is rotated to cover the base assembly, the hooking member is attracted by the magnet and hooks onto the cover assembly. When the sliding member slides, the sliding member pushes the hooking member to disengage from the cover assembly.

Abstract: A device (1) in glass wall claddings for mounting insulating-glass sheets (12), each glass sheet (12) comprising at least two glass slabs (13, 14), which are joined together by means of a jointing substance (16), said device (1) having a first position, wherein said device (1), upon mounting of said insulating-glass sheet (12), allows the insulating-glass sheet to be placed in the desired position, and a second position, wherein the device (1) grips at least one (13) glass slab of said insulating-glass sheet (12). The device (1) comprises a retainer member (3) and an anchoring member (2). A portion of one part (4) of the anchoring member (2), which part upon mounting of an insulating-glass sheet (12), i.e. as the anchoring member (2) of the device is guided from said first position to said second position, is arranged to penetrate into said jointing substance (16) of an insulating-glass sheet (12) in response to the anchoring member (2) being tilted to said second position.

Abstract: A hooking device includes a hook for clasping a latching device, a spring mounted to the hook for providing a restoration force to the hook, and a base securing the hook and the spring thereon. The hook includes a main portion, a catch portion, and a pair of shaft portions extending from the other end along opposite direction. The spring includes two winding portions, two first arms extending from ends of the winding portions, the first arms acting on the hook; and two second arms extending from the other ends of the winding portions. The base includes a base plate defining an opening, two supporting plates accommodating the shaft portions, two bearing plates extending from the base plate, the second arms acting on the bearing plate, and an elastic arm extending from the base plate pushing on the other end of the main portion of the hook.

Abstract: A latch structure includes a base, a connecting unit, a first spring member, at least one hook unit and a button. In this case, the connecting unit has a first side and a second side, and the connecting unit is disposed on the base. The first spring member has a first end and a second end. The first end connects to the connecting unit and the second end connects to the base. At least one hook unit is located at the first side of the connecting unit. The hook unit has a moving member with a hook portion and a connecting portion, and the hook portion locates in a first site. The button is located at the second side of the connecting unit. When the hook portion does not locate in the first site, the button moves toward a first direction, the button pushes the connecting unit in a second direction, and the connecting unit touches the connecting portion. Accordingly, the hook portion turns to the first site.

Abstract: A latch assembly for a door includes a housing composed of a base and a cover. A drive knob, two links, two hooks, two adjusting members, and two torsion springs are connected between the base and the cover. The drive knob includes a drive surface that is engaged with a straight inside portion of a through hole of the links. One of the two links is pivotably connected to an adjusting portion of the other link and retaining slot of one of the two hooks. The other link has a positioning portion that is pivotably connected to the retaining slot of the other hook. When the drive knob is rotated in a particular direction (typically counterclockwise), the two links are pivoted in opposite directions and the two hooks are pivoted in two opposite directions and extend through apertures in the first outer surface of the base to hook a keeper structure and secure the door.

Abstract: A latching overlay for a tool storage unit drawer includes a drawer pull with a substantially horizontal flange portion perpendicular to a front face of the drawer and extending across at least a portion of the drawer width. In a preferred embodiment, the latching overlay includes a trim channel having a first surface for engaging a top face of the horizontal flange portion of the drawer pull, a second surface for engaging a bottom face of the horizontal flange portion of the drawer pull, and a release connected between the first surface and the second surface such that the trim channel is capable of pivoting about the horizontal flange portion. At least one drawer latch hook connected to the trim channel is provided, wherein the drawer latch hook engages and disengages from a latching component of the tool storage unit in response to the pivoting movement of the trim channel.

Abstract: A hyperbaric capsule has a base forming a seat that can be enclosed by an elongate oval canopy having a large transparent window formed therein. The bottom of the front of the canopy is pivotally attached to the front of the base by a hinge assembly and can be locked in the closed position on the base by a plurality of latches that are conjointly operated by an external lever and an internal lever. The weight of the canopy upon opening is borne by a pair of side gas or spring struts.

Abstract: A latching overlay for a tool storage unit drawer includes a drawer pull with a substantially horizontal flange portion perpendicular to a front face of the drawer and extending across at least a portion of the drawer width. In a preferred embodiment, the latching overlay includes a trim channel having a first surface for engaging a top face of the horizontal flange portion of the drawer pull, a second surface for engaging a bottom face of the horizontal flange portion of the drawer pull, and a release connected between the first surface and the second surface such that the trim channel is capable of pivoting about the horizontal flange portion. At least one drawer latch hook connected to the trim channel is provided, wherein the drawer latch hook engages and disengages from a latching component of the tool storage unit in response to the pivoting movement of the trim channel.

Abstract: A reach out lock for a sliding door includes a keeper having a keeper latch and a locking mechanism having a hook to engage the keeper latch. The reach out lock further includes a mechanism which prevents actuation of the locking mechanism if the locking mechanism is out of alignment with the keeper.

Abstract: An auto-lock mechanism to be mounted on an image input/output device includes a first swingable element and a second swingable element. When the image input/output device is not slantwise and an upper cover of the device is opened, one of the first and second swingable elements swings but does not hook the other of the first and second elements. When the image input/output device is slantwise, both of the first and second swingable elements simultaneously swing, approach and hook each other such that the upper cover remains closed and is free from detachment to hurt a user.

Abstract: A door lock for an oven includes a lock housing, a geared motor, an actuating shaft to be driven by the geared motor, a retaining plate and a locking element formed as a lever to be operated by the actuating shaft. The lever is mounted on the retaining plate and has a lever axle for reversibly changing location relative to the lock housing. A spring exerts a force being overcome in an emergency-unlocking function permitting adjustment of the retaining plate to allow opening of the lever having been previously brought into a locking position by the actuating shaft, without further operation of the actuating shaft. The actuating shaft is adjustable along its axis by the lever having been unlocked in an emergency.

Abstract: A hooked fastener includes a holding member, a covering on the holding member, a hooked plate and a rotary sleeve between the holding member and the covering, and a coupling piece for the hooked plate to be hooked over; the holding member has a rail, and the hooked plate has on one side a post-shaped protrusion received in the rail; the rail of the holding member and the post-shaped protrusion of the hooked plate together will serve as a guiding means for the hooked plate when the rotary sleeve is wrenched so as to move the hooked plate; the hooked plate has a guide rail on the other side, and the holding member has a guide rod secured therein and passed through the guide rail of the hooked plate; the guide rail and the guide rod together also will serve as a guiding means for the hooked plate.

Abstract: Door assembly including a hook at one side of a cabinet for engagement with a door lock, rotating shafts at opposite sides of the hook, a door frame having an opening for pass through of the hook, a first supporting part on the door frame having a pass through hole for inserting one side of the rotating shaft, and a second supporting part on the door frame having an opened loading groove for loading the other side of the rotating shaft, thereby providing a door assembly which can be assembled readily, and permit more stable operation.

Abstract: A latch mechanism includes a latching member, a push member, and a sliding member. The latching member is slidably installed in a cover unit in parallel to a front wall thereof. The latching member includes a hook for engaging with a base unit. The push member is slidably installed in the cover unit parallel to a sidewall perpendicular to the front wall thereof. The sliding member is connectable with the push member, and is capable of being operated to drive the push member to push the latching member for disengaging the hook of the latching member from the base unit.

Abstract: A mechanical latch assembly includes a supporting frame, a locking latch, an actuation arrangement and a safety lock arrangement. The locking latch is slidably mounted on said supporting frame in longitudinally movable manner. The actuation arrangement includes an actuation handle pivotally connected to said supporting frame to longitudinally drive said locking latch moving between a locked position an unlocked position. Moreover, the safety lock arrangement includes a locker member movably mounted on said supporting frame, wherein said locker member has a slider slot formed thereon to define a pusher surface and an opposed retracting surface, and a thermal activated arm substantially extended from said supporting frame to slidably pass through said slider slot of said locker member at a safety temperature, and adapted to deflect to push said locker member at said pusher surface at an elevated operation temperature.

Abstract: Articles and methods for installing hook bolts on bridge decks constructed of timbers and structural steel members. A tether is lowered through a hole in a timber, captured below the bridge deck, and drawn upward around the timber or between timbers. A hook bolt is engaged with the end of the tether that was lowered through the hole and drawn upward, then lowered under the bridge deck and drawn upward through the hole in the timber. The hook bolt engages with a flange on a structural member of the bridge deck.

Abstract: The releasable locking arrangement for two components consists of a hook-connecting element arranged on a first component (10) and a spring-loaded locking hook (26) with swivelling axis (22) arranged on a second component (20). The locking hook (21) and the hook-connecting element can be connected with one another to form the lock. The hook-connecting element on the first component (10) is a retaining rod (11) whose ends are movable in a guide track (12, 12?). The swivelling axis (22) of the locking hook (21) on the second component (20) is connected with a holder (27). The holder (27) has a sliding bevel (24-S, 25-S) for the retaining rod (11). When the two components (10, 20) approach one another, the retaining rod (11) slides upwards on the sliding bevel (24-S, 25-S) of the holder. This causes the retaining rod to move in its guide track (12, 12?) at the same time.

Abstract: Arrangement with a locking element for an imaginary mechanical locking arrangement, consisting of the locking element (2) and a locking hook (3) whose hooked part can be connected with the locking element to close the lock. The locking element (2) is part of a single-part or two-part elongated body (4) consisting of curved and/or straight sections. The locking element (2) is located in the recess (6) of a plastic body (5). The parts of the elongated body (4) lying beyond the locking element (2) are, for the most part, embedded in the plastic body (5), where the direction of at least one of these embedded sections is towards the interior of the plastic body (5).

Abstract: A latching mechanism for a carrying case includes a latch body pivotally attached to a top cover of the case, a trigger pivotally attached to the latch body, and an actuator that pivots about the same axis as the trigger. The trigger is pivotable between a latching position for keeping the latch body closed, and a release position to allow the case to be opened. The actuator is pivotable toward and away from a nominal actuator position in which a panel of the actuator assumes a predetermined alignment with the latch body. A torsion spring biases the trigger toward the latching position, and through trigger/actuator contact biases the actuator into the nominal position. The trigger can move toward the release position while the actuator is held in the nominal position, to maintain the selected alignment for a more natural, intuitive latching mechanism closure.

Abstract: A mechanical latch assembly includes a supporting frame, a locking latch, an actuation arrangement and a safety lock arrangement. The locking latch is slidably mounted on the supporting frame in longitudinally movable manner. The actuation arrangement includes an actuation handle pivotally connected to the supporting frame to longitudinally drive the locking latch moving between a locked position an unlocked position. Moreover, the safety lock arrangement includes a locker member movably mounted on the supporting frame, wherein the locker member has a slider slot formed thereon to define a pusher surface and an opposed retracting surface, and a thermal activated arm substantially extended from the supporting frame to slidably pass through the slider slot of the locker member at a safety temperature, and adapted to deflect to push the locker member at the pusher surface at an elevated operation temperature.

Abstract: A hooking device includes a hook for clasping the latching device, a spring mounted to the hook for providing a restoration force to the hook, and a base securing the hook and the spring thereon. The hook includes a main portion, a catch portion, and a pair of shaft portions extending from the other end along opposite direction. The spring includes two winding portions, two first arms extending from ends of the winding portions, the first arms acting on the hook; and two second arms extending from the other ends of the winding portions. The base includes a base plate defining an opening, two supporting plates accommodating the shaft portions, two bearing plates extending from the base plate, the second arms acting on the bearing plate, and an elastic arm extending from the base plate pushing on the other end of the main portion of the hook.

Abstract: A hood latch device for a vehicle comprises a base plate secured to a vehicle body. A striker is secured to a pivotal hood of the vehicle body. A primary latch plate and a locking plate are pivotally connected a rear surface of the base plate and engageable with the striker to permit the hood to have a locked full-close position and a released open position. A secondary latch plate is pivotally connected to a front surface of the base plate and engageable with the striker to permit the hood to have a slightly open position and the released open position. A first stopper is arranged to stop an excessive pivoting of the secondary latch plate by contacting a given part of the secondary latch plate. The first stopper is provided by bending an end portion of the base plate without producing an opening therethrough.

Abstract: An apparatus with a two-way hidden latch. A main body comprises a magnet disposed under a retainer, which fixes the two-way latch disposed in a cover portion. The cover portion can be placed on the main body with a first or second surface facing downward. The cover portion comprises a first and second opening and a two-way latch is disposed near the two openings. When the cover portion is open, the two-way latch is fixed at an original position and hidden in the cover portion. When the cover portion covers the main body with the first surface facing downward, the two-way latch is drawn by the magnet to a first position, engaging the retainer. Moreover, when the cover portion covers the main body with the second surface facing downward, the two-way latch is drawn by the magnet to a second position, engaging the retainer.

Abstract: A reach out lock for a sliding door includes a keeper having a keeper latch and a locking mechanism having a hook to engage the keeper latch. The reach out lock further includes a mechanism which prevents actuation of the locking mechanism if the locking mechanism is out of alignment with the keeper.

Abstract: A latch assembly connected to a lock face of a sliding door includes two hooks which are connected to two activation plates respectively. Two rotation gears each have teeth engaged with the activation plates which are moved to pivot the two hooks when the two gears are rotated. A safety member is biased by a spring and includes a contact pin which movably extends through the lock face on the sliding door so that the safety member is pushed when the contact pin is pushed by a fixed door when the sliding door is in close position. The safety member further has an engaging pin which is removably engaged with the recess of the activation plate so that when the sliding door is in open position, the activation plate cannot be moved and the hooks are remained in the sliding door.

Abstract: This invention relates to a security system aimed at closing and locking a cover of an opening of a tank trailer to avoid any tampering of its content and to prove that the content of the tank has not been tampered. The security system comprises a locking member movable between a lock position to prevent the opening of the cover, and an unlock position to allow the opening of the cover. The invention also comprises an actuating device mounted to the tank trailer operatively connected to the locking member for moving it between the lock and the unlock positions. A sealing mechanism engages the actuating device when the locking member is in the lock position to prevent any movement of the locking member. The sealing mechanism comprises a breakable indicator which is broken upon disengagement from the actuating device, thereby indicating that the openable cover has been tampered with.

Abstract: A locking device applies to a casing having a cover and a seat for opening and closing of the casing. The locking device has a recess formed on an edge of the seat, a buckle downwards protruding from the cover and matching the recess, and a roller parallel-disposed in the recess and pivoted to the seat. The buckle has an arcuate face smoothly against an upper slot of the roller for closing and opening the casing. A direction of lifting of the cover corresponds to a rotation of the roller so that a direction of applied force can be continuously unchanged to achieve an ergonomic effect.

Abstract: An opening switch for an opening and closing body includes a switch base having a first substrate and a second substrate which are put together in a manner such that inner faces of the substrates face each other and outer faces of the substrates are outer faces of the switch base; a main switch body provided on the outer face of the first substrate; a lever portion which is provided on the inner face of the first substrate and passes the second substrate through a through hole; and a flange portion for preventing an over stroke of the lever portion. The flange portion protrudes from the outer face of the second substrate and is positioned away from the lever portion and on a side toward which the lever portion is inclined. A flexible cover member for covering a combined body of the lever portion and the flange portion is provided.

Abstract: A lock assembly includes a casing, two pivotable members pivotally mounted in the casing and meshed with each other, two linking rods, and two hook device each including a hook member and a rocker arm that is pivotally mounted in the casing. Each hook member has a first end pivotally connected to an associated rocker arm and a hooked second end that is passable through an associated one of two openings of the casing. When either pivotable member is pivoted, each rocker arm and each hook member are actuated such that the hooked second end of each hook member is moved between a retracted position in the casing and a locking position out of the casing. Damage to the hooked second ends of the hook members during closing of a door is prevented.

Abstract: A latch system for securing a sliding window to a fixed member, the latch assembly including a latch housing, a catch housing, and a latch assembly. The latch assembly includes first and second latch arms and an actuator. The latch arms are pivotally secured to the latch housing and include first, actuated ends that are disposed within the latch housing and second, latching ends that are disposed outside of the latch housing and received by the catch housing. The actuator is slidably secured to the latch housing and operable to engage the latch arms' actuated ends so as to pivot the latching ends out of engagement with the catch housing and thereby permit the latch housing and the window associated therewith to move relative to the fixed member.

Abstract: A system for locking a first element with a second element, the system including a control member fitted on the first element and suitable for being actuated by a user in a direction that is substantially rectilinear and perpendicular to a pivot pin of a latch designed to co-operate with an anchor member fixed on the second element. The control member further includes a housing for receiving a finger of the latch while the latch is in the locked position so as to prevent the latch from pivoting about the pivot pin.

Abstract: The device comprises a hook (2) connected to the door (5) and a support structure (1) in which is defined an aperture (4) for the introduction of the hook (2) and in which are mounted: a rotatable member (6) biased by a spring (12) and operable to retain a hook in a closure position of the door (5) and to release this hook (2); and a control device (14-16) including a pawl (15). When, with the door (5) closed, a force is applied to the hook (2) in the direction such as to open the door (5), the rotatable member (6) is initially free to turn, against the action of the spring (11), with respect to an auxiliary body (9), to a position in which the rotatable member (6) releases the auxiliary body (9) from the pawl (15, 19), and then to turn, together with the auxiliary body (9) and under the action of the spring (11), to release the hook (2).