Abstract: A buckle lock is applied to lock a device having a fastening portion and comprises a body, the body includes a locking mechanism and includes a fixing groove configured to retain with the fastening portion of the device. The body further includes a press rod configured to move toward a unlocking position of the fixing groove so as to allow the fastening portion to move out of the fixing groove, and the press rod is also configured to move toward a locking position of the fixing groove so as to stop a removal of the fastening portion from the fixing groove.

Abstract: A chain lock includes a main body, a rotatable part, a cylinder, a plug provided with a tailpiece, and a chain. The main body defines therethrough a first channel and a second channel. The rotatable part defines therethrough a third channel. The rotatable part is rotatably mounted to the main body. The cylinder is slidably fitted into the first channel of the main body and biased by a compression spring. The plug together with the tailpiece is rotatably mounted in the cylinder. The chain includes a series of rings, one ring of which is located in the second channel of the main body and inserted through by the cylinder. In use, a second ring of the chain can be located in the third channel of the rotatable part to be inserted by the cylinder, and the plug can be rotated by a key to have the cylinder fixed in place.

Abstract: A door stop includes a body having a longitudinal axis and having angled sides defining an apex. A rotating toggle having angled sides defining an apex and a longitudinal axis is operably connected at its apex to the body at about the apex of the body. The toggle is rotatable such that the longitudinal axis of the toggle aligns with the longitudinal axis of the body in an insertion position and the longitudinal axis of the toggle is transverse to the longitudinal axis of the body in a locked position. A lock assembly is operably mounted to the body to lock the toggle in the locked position.

Abstract: The present invention, in some embodiments thereof, provides a safety lock for enabling partial opening of a door. The safety lock includes: (i) a first lock member configured for being installed at an opening of a doorframe of the door, wherein the first lock member includes a movable element and at least one track for allowing the movable element to slide there through, wherein the movable element comprises an opening. (ii) a second lock member comprising a protruding section, wherein the protruding section is configured for being inserted into the opening of the first lock member, installed at the doorframe, for allowing thereby pulling of the movable element for allowing partial opening of the door and removing the protruding section from the opening for opening the door.

Abstract: An apparatus for securing a closure such as door or a window that opens and closes by movement relative to a fixed structure such as a wall or a floor. Many embodiments provide a device for relocating a padlock from its normal location where it secures a fastener (such as a hasp) to a location for the padlock that is more accessible for locking and unlocking the padlock. Typically an extender is provided, where the extender has a hook at a first end that is disposed through the eye of the staple of the hasp, and at an opposing second end the extender has an annulus, such as a hole in the extender or a loop or ring affixed to the extender. The shackle of the padlock may be disposed through the annulus and may be disposed through the eye of a second staple to secure the door or window in a closed or open position. Some embodiments employ a rigid sheath to enclose at least a portion of the extender.

Abstract: A security door brace is provided for bearing against an inside surface of a barrier door in order to prevent non-permitted, inward opening of the door. The security door brace carries one or more elongated pin means for cooperative engagement with one or more slotted receiving means formed within a cooperating mounting plate that is firmly affixed, preferably via conventional screw fastener means, to a portion of the floor underlying the intended operable position of the security door brace.

Abstract: A vehicle includes a door assembly having an outside door handle, a latching assembly, and a cable-actuated inertial lock having a moveable linkage disposed within a cavity of a stationary housing. A first end of the cable is connected to the handle, and a second end is connected to the linkage. The inertial lock includes a lever for actuating the latch under normal conditions when the handle is actuated, and also contains a deployable toggle piece that is stowed in the linkage. The toggle piece is configured to rotate within the linkage, and thereafter lock against a shaped inner surface of the housing in response to a threshold acceleration of the type set forth in FMVSS 206 or other standards. A torsion spring may be used to bias the toggle piece into a stowed position within the linkage.

Abstract: The present invention is directed to a lock that provides a multipoint lock that includes reinforcement of the door and jamb on a relatively continuous basis. The lock is for installation in a residential or commercial door having a door frame or jamb and a door. The lock includes a fixed strip coupled to the door jamb, a sliding strip slidably coupled to an edge of the door configured to slidably engage the fixed strip, and a mechanism moveably engaged to the sliding strip for vertically moving the sliding strip to engage the fixed strip. Both the sliding strip and fixed strip have at least one tab extending outwardly therefrom and configured to engage each other. If desired, these tabs could be extended all along the sliding and fixed strips to provide a series of engagement points that serve to uniformly connect the door edge to the door jamb. Each tab on the door edge is formed so it can lock into the similar shaped tab on the door jamb to provide a secure point of connection.

Abstract: The invention provides a lock assembly (10) which has a support base (80) and a bolt (14) movable between an unlocked position, in which the bolt (14) is substantially within the support base in (80) and a locked position in which the bolt (14) extends from the support base (80). The lock assembly (10) also includes locking means (32) to block movement of the bolt (14) in the locked position and actuating means (46) for moving the blocking means (32) to release the bolt (14) from the locked position. The actuating means (46) can comprise electromechanical means, an electro restrictive polymer, piezoelectric material or a material adapted to contract when activated, such as shape memory alloy wire (36).

Abstract: A vehicle door latch system configured to temporarily prevent door latch mechanisms from unlatching during a predetermined event is provided. The vehicle door latch system includes a forkbolt pivotally mounted to a housing portion of the vehicle door latch. The forkbolt is capable of moving between a latching position and an unlatching position. The door latch system also includes a block out mechanism configured for movement between a blocking position and an unblocking position. The block out mechanism is configured to prevent the forkbolt from moving from the latching position to the unlatching position when the block out mechanism is in the blocking position. A biasing member biases the block out mechanism into the unblocking position.

Abstract: The invention relates to a device (10) for the detachable connection of structural parts (80, 84) in an aircraft, comprising a clamping lever arrangement (12) associated with a first structural part (80) and a clamping pin (14) associated with a second structural part (84), wherein the clamping lever arrangement (12) comprises an eccentric shaft (20) rotatably mounted about a rotation axis (A) on the first structural part (80), a clamping lever (16) mounted eccentrically and swivellably with respect to the eccentric shaft (20), and a driving bushing (18) rotatably mounted relative to the eccentric shaft (20) about the rotation axis (A) and coupled in a geared manner to the clamping lever (16), wherein the clamping lever arrangement (12) can furthermore be displaced between a release position, a readiness position and a locking position, wherein the clamping lever (16) in the release position releases the clamping pin (14) and wherein the clamping lever (16) in the locking position engages the locking pin (14)

Abstract: A lock-out device for an exit device door operator mechanism, the lock-out device being configured to interact with the operator mechanism, which would normally require a key to change the condition of the operator mechanism between a locked and unlocked condition, thereby allowing someone on the inside of the door to manually lock the door against entry from the exterior without using the key for the locking mechanism. In one possible embodiment, the lock-out device is adjustable to fit a range of differently sized exit device door operator mechanisms.

Abstract: A surface-mounting multipoint lock includes an elongated housing having a lower end, an upper end, and a mounting member. The lock is configured for attachment along and external to a non-hinged vertical edge of a swinging panel along substantially a full extent of the non-hinged vertical edge. A plurality of spaced latch bolts in the housing include an upper latch bolt proximate to the upper end of the housing, and a lower latch bolt proximate to the lower end of the housing. The latch bolts are substantially laterally movable between a locked position and an unlocked position.

Abstract: A door bolt is constructed to include a jam plate fixedly fastened to a doorjamb, and a doorplate assembly installed in the free end of a door panel and adapted to secure the free end of the door panel to the jamb plate, the doorplate assembly having a lock cylinder controlled by a key to move a movable frame bar in a fixed locating frame bar and to further move two locking straps relative to each other between a first position where the doorplate assembly is prohibited from escaping out of the constraint of the jamb plate and a second position where the doorplate assembly is released from the constraint of the jamb plate.

Abstract: A door locking assembly includes a locking arm mount that is fixedly attached to a first side of a doorframe. An arm has a first end and a second end. The first end is pivotally coupled to the locking arm mount such that the arm is selectively positionable between a first position extending away from the frame and a second position extending across the door. A loop is attached to the arm and is positioned generally adjacent to the second end of the arm. A lock mount is fixedly attached to a second side of the doorframe and is positioned for removably receiving the loop. A lock may be positioned in the cylinder and positioned on the loop for selectively locking the arm in the second position.

Abstract: A door bolt is constructed to include a jam plate fixedly fastened to a doorjamb, and a doorplate assembly installed in the free end of a door panel and adapted to secure the free end of the door panel to the jamb plate, the doorplate assembly having a lock cylinder controlled by a key to move a movable frame bar in a fixed locating frame bar and to further move two locking straps relative to each other between a first position where the doorplate assembly is prohibited from escaping out of the constraint of the jamb plate and a second position where the doorplate assembly is released from the constraint of the jamb plate.

Abstract: An improvement to Del Nin's security locking device outlined by U.S. Patent No. 5,983,680 issued Nov. 16, 1999 is described wherein the improvement comprises of new gearing arrangement and vertical deadbolt design so as to strengthen the device's vulnerability to forced breakage, and so that such locking device may operate on doors opening from either left or right sides of its door frame. This improved vertical deadbolt design additionally replaces need for any spring-like mechanisms prone to attack and vulnerable to wear and tear, with more sturdy bayonette latch mechanism resulting in solid precision control over deadbolt's vertical movement.

Abstract: A security device for use in securely fixing the entry path of an enclosure in a predetermined semi-open position includes a first member removably mountable to a structure associated with the entry path to an enclosure and a second member removably mountable to a different structure associated with the entry path to an enclosure and a spacer extending between said first and second members. The security device acts to fix the structures associated with the entry path in a predetermined, spaced position with respect to one another such that the entry path is semi-open to allow access into the enclosure for equipment but which prevents a person from gaining entrance to the enclosure through the entry path.

Abstract: A security device which is mounted on a door adjacent a deadbolt lock. The security device is a chain which will have a link with a ring at one end which is passed around the knob on the deadbolt to prevent the deadbolt knob from being turned and, therefore, opened.

Abstract: A stand alone, electronic gate lock is integrally mountable with a barrier, such as a perimeter fence of an airport. The gate lock is configured to be locked and unlocked by an electronic key from key access ports on each of interior and exterior sides of the barrier. An electronic controller of the gate lock stores data associated with each attempted electronic key access of the gate lock, so that a history of access to the gate can be tracked. This enables every access to the gate lock to be tracked, thereby increasing the likelihood that the gate will be maintained in its locked condition at all times other than when opened for authorized access.

Abstract: A Z-bar security system, one which is provided with a key and a secured latch, is combined with an electronic alarm and monitoring system. This combination provides the maximum degree of both mechanical and electronic security. In a preferred embodiment, a Z-bar latch assembly has a three-position rotatable cylinder which is operable by a key from outside of the door. These three positions correspond, respectively, to "open", "viewing" and "closed" positions of the door.

Abstract: A security lock is described which permits a door to be opened by a predetermined amount while maintaining security against forced entry. Preferably, the security lock also functions as a deadbolt lock and comprises a slotted floor plate covering an aperture in the floor, a vertical bolt extendable into the aperture, and a lock mechanism which raises and lowers the bolt into and out of engagement with the floor plate. In a first engaged position, the end of the bolt is locked into engagement with the floor plate in such a manner that the door may be partially open. However, the bolt cannot be removed from the floor plate with the door open, thus providing security against forced entry through the partially open door. In a second engaged position, with the door completely closed, the bolt may be raised or lowered into or out of engagement with the floor plate, similar to a conventional deadbolt lock.

Abstract: A triple articulating security device for use with a door, such as a house door having a hinged side and a latch (opening) side device holds a door in a closed (security) position or in a partially open (viewing) position. The security device generally comprises a pair of mounting brackets and a bar. The mounting brackets mount, preferably on opposite sides of the door. The bar comprises a viewing portion pivotally mounted to the latch-side bracket, an elongated telescoping portion pivotally mounted to the hinge-side bracket, a pivot pivotally joining their inner ends, a locking mechanism for selectively locking the pivot.

Abstract: A locking device for a door, or the like, with a fixed frame and a leaf includes a main lock and a leaf-restraining device on the leaf, with a driving pin of the leaf-restraining device being engageable with a gap limiter installed on the fixed frame. The main lock and the leaf-restraining device are connected to each other in such a manner that, from the main lock the driving pin can only be disengaged from the gap limiter by operating the latch of the main lock by means of a locking element.

Abstract: An anti-snooping device for doors to apartments comprising a locking mechanism and a relatively low-strength, "tamperproof" seal capable of engaging the locking mechanism, the locking mechanism being capable of disengagement without, however, compromising the "tamperproof" seal. The invention's preferred embodiment is a chain door lock in which one of the chain's links has been replaced by a coded, colored, plastic, "tamperproof" seal. To enter the apartment, the apartment dweller uses, first, her door key and then, second, the key to or, alternately, the combination of, the anti-snooping device. Entry by anyone else must be effected by breaking the "tamperproof" seal or by breaking or successfully picking the anti-snooping device's lock.

Abstract: A system for locking a door can: (1) lock the door in dead bolt fashion in three modes, (2) allow the door to open a limited distance, or (3) allow the door to open freely. The system has a door-mounted latch assembly that includes a base plate, an intermediate link pivoted to the base plate, and a mode selection and latching assembly that is pivoted to the intermediate link. A latch plate is mounted on the door frame in juxtaposition to the door-mounted latch assembly. The latch plate has a tubular portion with an opening for receiving the latch member. A sleeve fits inside the tubular portion of the latch plate. When the latch member is engaged in the tubular portion of the latch plate, the sleeve can be rotated so that the latch member is engaged to the sleeve in a secured position. The latch plate includes a locking mechanism to releasably lock the sleeve into the secured position. The locking mechanism may be a spring-loaded pin mounted within the sleeve.

Abstract: A door lock mechanism includes a retainer housing mounted to a doorframe and a chain housing mounted to a door plate. The retainer housing includes a retaining slot defined in a lateral side thereof and a lock core mounted therein. A lock piece is pivotally received in the retaining slot and is releasably engaged with the retaining member. A chain is mounted in the chain housing and includes a fixed first end and a second end to which a slide bolt is securely attached. The slide bolt is releasably, slidably received in the retaining slot of the retainer housing. When in a locked position and when a release button is in its first position, the lock piece is stopped by the retaining member and the slide bolt is retained in the retaining slot and thus allows the door to be opened for a small gap.

Abstract: A door locking device includes a housing having a lateral hole and a stop rotatably engaged in the lateral hole. A chain has one end secured to a door panel and has a head secured to the other end for engaging in the slot. A latch is extendible inward of the lateral hole for engaging with the stop. The head is movable over the stop into the slot when the latch is engaged with the stop and is prevented from moving over the stop by the latch so as to be prevented from disengaging from the slot. The door panel may be opened for a small gap only when the users are not home.

Abstract: The invention relates to a security device for doors or windows for foiling unwanted entry into a secured facility comprising a limited rotational vertical rod having a plurality of parallel horizontal rods extending from said vertical rod. The parallel horizontal rods are positioned into a locked position against the interior door, into a partially open position by holding the edge of the door with curved ends and into an unlocked position away from the door.

Abstract: A conversion kit allows a user to convert a deadbolt lock mechanism into a pick proof deadbolt lock mechanism by providing all the necessary parts allowing a user to easily and effectively prevent the turnpiece latch of the deadbolt lock mechanism from rotating. Once installed, a locking shaft pin of the kit can be placed into a first orifice drilled through the turnpiece latch and a second orifice, coaxially aligned with the first orifice, drilled through the backplate to immobilize the turnpiece latch in its locked position. It would also allow a deadbolt manufacturer to use the same, in which case collars could be an O-ring style.

Abstract: A conversion kit allows a user to convert a conventional deadbolt lock mechanism into a pick proof deadbolt lock mechanism by providing all the necessary parts allowing a user to easily and effectively prevent the turnpiece latch of the deadbolt lock mechanism from rotating. Once installed, a locking shaft pin of the kit can be placed into a first orifice drilled through the turnpiece latch and a second orifice, coaxially aligned with the first orifice, drilled through the backplate to immobilize the turnpiece latch in its locked position. It would also allow a deadbolt manufacturer to use the same, in which case the collars could be a rivet style.

Abstract: A door locking mechanism of the chain guard type which can be used as a dead lock and in a manner similar to currently popular regular safety chain type door locks. The mechanism comprises a bolt keeper formed with at least one elongated slot terminating into at least one enlarged opening. A bolt matched in size and shape cooperates with this keeper and is inserted into the keeper through the opening and captively slides in it after insertion. The mechanism further includes a key operated lock having a lock member that can be secured to and released from the lock. A chain interconnects the lock member and the bolt and forms therewith a chain assembly having an operative length which is selectable between at least two positions. In one of these positions, the bolt can be removed from the keeper without freeing the lock member from the lock.

Abstract: A checking mechanism for a closure member and a frame, the closure member moveable in relation to the frame, the checking mechanism comprising a housing affixed to the closure member or the frame and having an opening therewith; a link member having a core and having two sides, the link member being fastened to either the frame or the closure member, the link member being moveable in relation to the housing and passing through the opening therewith; link engaging means secured with the housing proximate the opening at, at least one side of the link member, and retained in at least one compatible groove formed proximate at least one side of the link member for the positioning of the link member in relation to the housing, the grooves of the link member being formed by coating the core thereof with moldable material prior to assembly of the checking mechanism.

Abstract: A timer controlled lock operating device for a refrigerator or the like is provided and consists of a plate affixed to the side wall of the refrigerator, a link chain having one end secured to the plate, a housing affixed to the front door of the refrigerator, a shackle extending from within the housing and engaging an opposite end of the link chain, and a mechanism within the housing for opening the shackle at a predetermined period of time so that a person can remove the link chain from the shackle and open the front door of the refrigerator to gain access therein to obtain food.

Abstract: An auxiliary safety chain device for securing stud/loop retainer safety latching type devices is disclosed. The device includes a stud securement member secured to the stud of the safety latch device. A coupling member is coupled with the loop retainer. A locking mechanism secures the coupling member and the stud securement member together to lock the device.

Abstract: A combination lock for a panel and a frame is provided. The panel and the frame are such that the panel can move relative to the frame and the combination lock is such that it can lock the panel relative to the frame. The panel has an arm member extending therefrom and the lock releasably prevents the arm member from moving so as to inhibit opening of the panel. In one embodiment the panel can be a swing-out type window. In another embodiment it can be a sliding panel such as a glass door or window.

Abstract: A portable lock mechanism to secure safety chain latch devices is disclosed. The lock device includes a locking mechanism having a member coupled therewith which is adapted to be coupled with a safety chain latch slide plate. Also, a mechanism to retain the safety chain is coupled with the locking mechanism. The retaining member is coupled with the locking mechanism such that in a first position the safety chain is removably coupled with the retaining member which, in turn, is unlocked with the locking mechanism and in a second position the safety chain is nonremovably coupled with the retaining member which, in turn, is locked with the locking mechanism.

Abstract: A dead bolt lock houses both a dead bolt and a security chain assembly. Externally accessible drive linkages cause the simultaneous ejection of the dead bolt and a portion of the security chain assembly whereby the dead bolt is engaged with a strike plate in the door jamb and the security chain assembly is latched to a chain latch assembly which forms a part of the strike plate. Operation of the externally accessible drive linkage to withdraw the dead bolt back into the lock is achieved without disengagement of the security chain assembly from the jamb mounted latch. A separate latch release is provided for disengaging the security chain. The lock body is provided with door penetrating detents which are actuated by the insertion of the dead bolt within the lock body whereby the detents are raised from within the lock body so as to lockingly engage with the door.

Abstract: The system automatically warns when opening of an exit door is attempted, causing an alarm to be made and preventing full opening for a predetermined period of time. Such a system includes an electromagnet, timer, alarm and activator switch connected in series with a power source such as house current and disposed in and around the frame with no electrical connection to or from the door. A magnetically attractable plate or prong is secured to the door adjacent to the electromagnet. The switch may include a spring biased plunger on the frame, held in the closed circuit position against the spring bias with the door closed. The switch automatically moves to the closed circuit position when the door begins to open, causing an alarm to be immediately sounded and the plate to continue to be strongly held by the electromagnet, thereby preventing full opening of the door. The system permits the full opening of the exit door only after a suitable period of time has elapsed.

Abstract: Door-swing restraint apparatus for a pair of latched doors closing an end opening of a cargo box comprises a chain or cable link connected between margins of the doors so that a person actuating a bar to release door latches will not be injured by freight items which bear against the door. One end of the link is fixed in the marginal edge of one door, the other end being fixed to a lever arm which can be selectably engaged with or disengaged from a lateral bracket on the latch bar of the other door, only when the arm is rotated out of its horizontal transport position into the vertical. Rotation of the bar due to torque exerted by a freight item pressing against the door is limited by a stop pin carried by the bar engaged in a slot in a door-mounted journal. The opening swing of the door is limited to a few centimeters as the link becomes taut and the lever arm remains horizontal, visually signalling the hazard.

Abstract: The present invention relates to a coupling member which comprises a first slotted member and a second key member, wherein the second key member is arranged to be inserted in to the slot of the first member and to be latched to the first member upon being partially rotated. The coupling member of the present invention is particulary envisaged for use as a secondary safety coupling between a towing vehicle and a trailer which are coupled by a primary coupling such as a ball and socket coupling.

Abstract: Disclosed is a locking device which comprises a stationary member permanently mounted on a door structure together with a passive stationary block permanently mounted on adjacent wall structures which is connected to an interlocking member by means of an armored cable, the interlocking member interlocking with the stationary member to preclude movement in all directions but one and with a cylindrical barrel lock interlocking with both the stationary member and the interlocking member to preclude movement in the remaining one direction. The entire structure is generally invulnerable to attack by conventional burglary tools unless such attack is carried out for excessive periods of time, e.g., an hour or longer.

Abstract: This invention is a unique method and apparatus for securing doors, windows, and the like, from unwarranted entry so that limited opening of the door, or the like, can be accomplished. The invention further provides for the emergency release of the securement device by a person from the inside of the locked room. Methods and apparatus for adapting and installing the securement device is unique and the unwarranted entry is further accomplished by means of unique design for preventing jarring or vibrating the securement device out of position of proper operation. Additional features include the allowing of entry into the room from the outside authorized persons by means of undetectable access features.

Abstract: The security device of the present invention is mounted in the floor of a building adjacent the hinge side of a door to be made secure. The security device has elements which can be elevated from their storage position to engage against the inner face of the door to prevent the door from being opened beyond a minimum amount. A lock is provided for holding the elements in their elevated position.

Abstract: An automatic lockable linkage system for use with sliding members, such as a sliding door or window, comprising a first and second telescoping arm member pivotally interconnected adjacent to their inner end portions. Each telescoping arm member also has an outer end which is pivotally connectable to a fixed structure and a sliding member, respectively. When the sliding member is in the closed position, a lockable sliding linkage is automatically positioned over the pivotally interconnected inner end portions of the first and second telescoping arm members retaining the sliding member in the closed position.

Abstract: A retainer plate is pivotally mounted on a panelboard cabinet door lock housing, which carries a latch for locking the door. A detent on the plate engages in a rabbet opening to enable limited opening movement of the door in response to the pressure developed by arc gases generated by fault currents passing through a tripped circuit breaker in the panelboard cabinet. For ordinary opening movement, the lock latch is manually operated to pivot the retainer plate and disengage the detent from the rabbet opening.

Abstract: A safety device for doors comprising a cylindrical housing going through to the door, a locking pin to be locked in the housing and a chain one end of which is locked to the pin and the other end being attached to the door frame. The housing is attached to the door by means of two flanges, one on each side of the door, the spacing of which is adjustable.

Abstract: A locking device for use with a dead bolt means comprises a backing plate formed with parallel guides defining a recess therebetween, a slide within the recess and able to extend beyond an open end thereof and formed with an elongate aperture and adapted to receive dead bolt means projectable and retractable relatively thereto, and pin means extending through the recess and the aperture so that a door may be retained in closed or partially opened locked condition depending on the position of the pin and slide or may be unlocked by retraction of the dead bolt means.

Abstract: A door security and release system wherein a door safety chain or similar linkage is tautly held in door securing condition against any efforts to release it from outside the door, with release means associated with the inside door operating member and adapted to be actuated by turning the door operating member.

Abstract: A door lock, requiring no penetration of a door leaf for unlocking from the outside, comprises a keeper secured to the inner surface of the door leaf, a housing slidably articulated to the keeper by two pivot studs, and a detent on an adjoining door post engageable by a pair of spring-loaded levers in the housing whose fulcra are a pair of pins normally immobilized by a retaining disk. With the door closed and the detent engaged, the housing fits around the keeper and can move away from it to a limited extent, allowing the door to be opened slightly, unless a handle on the housing is turned into a latching position engaging a bolt fixed to the keeper. Unlatching of the door from within, by reverse rotation of the handle, also disengages the levers from the detent so that the door can be opened wide. When the door is opened from the outside, its leaf is held ajar by the housing whose handle cannot be rotated in this position since the levers are blocked by the pivot studs.