Patent Description:
Commercial aircraft are used to transport passengers between various locations. A commercial aircraft includes various internal chambers within a fuselage. Doors are used to gain access to the internal chambers. As an example, front access doors lead into an internal cabin of an aircraft. As another example, a cargo door provides access to a cargo hold of the aircraft.

A known type of cargo door is a plug door. One or more actuators are used to open and close the plug door in relation to a fuselage. Typically, the actuators are embedded within in and/or otherwise secured to a floor that separates the cargo hold from a passenger area of the aircraft. However, the actuators take up space within the floor structure, which can lead to a smaller cargo hold and/or reduced space within the passenger area. Further, it has been found that installing the actuators within the floor is time and labor intensive.

<CIT>, in accordance with its abstract, states actuating mechanisms for an aircraft door mounted along its upper edge to the body of an aircraft for movement into and out of a door opening in the fuselage. The hinge actuating mechanisms include a drive unit and linkage assembly secured to the body with all actuating components mounted on the door and positioned so that all actuating components move outwardly and upwardly to points outboard of an above the opening except for actuating links which pass through the upper corners of opening. The latch cam assembly employs a single actuator for pulling door to a fully closed position and for latching/unlatching a plurality of bottom latches and a pair of mid-span latches. The mechanism is sequenced to cause the latches to dwell in their unlatched condition while hooks pull the door into its fully closed position. The actuating mechanism is normally biased open by vent door biasing means.

<CIT>, in accordance with its abstract, states a door assembly having a door frame and a door hinged to one edge of the frame. The door comprises two parts hinged together for limited relative rotation, and an actuator effective with the door in the closed position operatively connecting the two parts so as to vary the effective depth of the door. The edge of the door remote from the main hinge and the corresponding edge of the door frame being provided with engageable hook means. The relative positions of the hook means being such that when the two parts of the door are set for maximum depth the hook means are disengaged from each other, whilst when the two parts of the door are set to a lesser depth the hook means engage each other to positively lock the door in a closed position.

<CIT>, in accordance with its abstract, states an outward-opening, plug-type cargo door for an aircraft movable between a closed position and an open position, in which the door is spaced from the cargo bay opening in a canopy orientation above and outboard of the cargo bay opening. The door hinges are directly driven by irreversible rotary actuators such that the weight of the door cannot back-drive the actuators. The door must be powered to the opened and closed positions thereby eliminating the necessity of a strut to prop the door open when cargo is being loaded and unloaded. The rotary actuators are mounted to the aircraft structure independently of the hinge mechanism's attachment to the aircraft structure so that the actuators can be removed and replaced if necessary, without disturbing the hinge mechanism or door linkage. The door is manually unlatched from either the interior or exterior of the aircraft through a dual handle system. A spring-biased pawl assembly is mounted on the door and coacts with a latch crank to prevent movement of the handle to the latched position when the door is spaced from the cutout opening. The spring-biased pawl cooperates with a cam surface associated with the cutout opening to permit movement of the handle to the latched position once the door is in the cutout opening.

<CIT>, in accordance with its abstract, states an airplane cargo door hinged about a horizontal, longitudinal axis is opened and closed by a hydraulic cylinder and linkage contained entirely within the space 'between the exterior and interior door wall panels. Luggage racks pivotally mounted on the interior door panel are connected to the linkage and steered clear of the doorway when the door is opened.

<CIT>, in accordance with its abstract, states an aircraft including a fuselage, an aircraft fuselage end cargo door, and a fuselage end cargo door mechanism. The aircraft fuselage end cargo door couples to the fuselage at a major joint line. The fuselage end cargo door mechanism including a hinge rotatably coupling an aircraft fuselage end cargo door to a fuselage, the hinge being coupled to both the aircraft fuselage end cargo door and the fuselage so that an axis of rotation of the aircraft fuselage end cargo door, defined by the hinge, relative to the fuselage is located forward of a major joint line between the aircraft fuselage end cargo door and the fuselage, wherein an uppermost portion of the major joint line comprises a joint line radius where a portion of the joint line radius formed by the aircraft fuselage end cargo door pivots within another portion of the joint line radius formed by the fuselage.

<CIT>, in accordance with its abstract, states electrically-operated hydraulic and mechanical apparatus for opening and closing a large door, for example, on a cargo airplane. Door latching or locking apparatus is also disclosed. The hydraulic and mechanical apparatus are sequentially activated so that, before the door latching operation can begin, full closing of the door is required. Conversely, before opening of the door can occur, full unlatching of the latching mechanism must first occur.

A need exists for a door of a vehicle, such as a commercial aircraft, which can be efficiently manufactured. Further, a need exists for a plug door of a vehicle that allows for increased space and capacity within an internal cabin. Also, a need exists for a plug door that exerts less stress and fatigue on a floor of a vehicle. Additionally, a need exists for an efficient and effective method of manufacturing a plug door of a vehicle. Also, a need exists for an efficient method of operating a plug door of a vehicle.

With those needs in mind, the present disclosure provide an access system for a vehicle according to claim <NUM>.

In at least one example, the access system may also include one or more linkages coupled to the one or more actuators. The one or more actuators are configured to move the one or more linkages to move the door between the open position and the closed position. In at least one example, the one or more linkages connect to a portion of a floor within the fuselage. As a further example, the one or more linkages may connect to an underside of the portion of a floor.

The one or more actuators may be separated from the floor within the fuselage.

In at least one example, the door may be a plug door that is configured to mate with a socket frame surrounding the opening when the door is in the closed position.

In at least one example, the internal chamber may include a cargo hold of the vehicle.

In at least one example, the vehicle may be an aircraft.

The one or more actuators can include one or more rotary motors. As another example, the one or more actuators can include one or more linear motors.

In at least one example, the access system may also include a control unit configured to control operation of the one or more actuators.

The one or more actuators are secured to the mounting plate that is mounted on the internal surface of the door.

Certain examples of the present disclosure provide a method of manufacturing an access system for a vehicle according to claim <NUM>.

Certain examples of the present disclosure provide an aircraft including a fuselage including a floor over a cargo hold having an opening formed in the fuselage; and an access system, as described herein and defined in claim <NUM>.

Certain examples of the present disclosure provide a plug door, such as for a cargo hold of an aircraft, which includes a simple attachment to a portion of a fuselage. In at least one example, an access system includes a door, and one or more actuators secured to the door. The actuator(s) may not be mounted to or otherwise secured to a floor of the aircraft. The actuator(s) are not embedded within the floor. By providing the actuator(s) on and/or within the door (instead of the floor), the floor can be more easily and quickly manufactured, and the door can be quickly and easily installed in relation to a fuselage of the aircraft. Further, a floor that does not include embedded actuators can have a smaller depth.

Certain examples of the present disclosure provide a plug cargo door for an aircraft. One or more actuators are mounted onto and/or within the plug cargo door, in contrast to being mounted to a floor within the fuselage. The actuator(s) are located on and/or within the door itself. In at least one example, the actuator(s) is attached to a secondary structure, such as a plate. In turn, the secondary structure is coupled to links, tracks, or the like that allow the door to translate, for example.

By providing the actuators on and/or within the door, lighter floors can be used, as less space within the floor is required (such space no longer needing to be large enough to accommodate actuators for doors).

<FIG> illustrates a schematic block diagram for an access system <NUM> for a vehicle <NUM>, according to an example of the present disclosure. In at least one example, the vehicle <NUM> is an aircraft, such as a commercial jet. As another example, the vehicle <NUM> can be an unmanned aerial vehicle, a helicopter, or the like. As another example, the vehicle <NUM> can be a spacecraft. As another example, the vehicle <NUM> can be a land-based vehicle, such as an automobile, bus, train car, and/or the like.

The access system <NUM> allows for access into an internal chamber <NUM> within a fuselage <NUM> of the vehicle <NUM>. In at least one example, the internal chamber <NUM> is a cargo hold within the fuselage <NUM>. As another example, the internal chamber <NUM> is a passenger area within the fuselage <NUM>. As another example, the internal chamber <NUM> is a flight deck or cockpit within the fuselage <NUM>. As another example, the internal chamber <NUM> is a galley within the fuselage <NUM>.

The internal chamber <NUM> includes an opening <NUM> that leads into the internal chamber <NUM>. The access system <NUM> incudes a door <NUM> moveably coupled to the fuselage <NUM> within the opening <NUM>. The door <NUM> is moveable between an open position, in which the opening <NUM> is opened to allow passage into and out of the internal chamber <NUM>, and a closed position, in which the opening <NUM> is closed, thereby preventing passage into and out of the internal chamber <NUM>.

In at least one example, the door <NUM> is a plug door. For example, the fuselage <NUM> can include a socket frame surrounding the opening <NUM>. The plug door is configured to mate into the socket frame into a closed position. The plug door is configured to seal itself by taking advantage of pressure differences on opposite sides. Higher pressure on one side of the door forces the plug door into the socket frame, thereby providing sealing engagement, and preventing the plug door from being opened until the increased pressure is released. In at least one example, in order to open the plug door, an initial inward and upward (or optionally, downward) motion is used (in contrast to a shear door, which is merely pivoted or rotated open about one or more hinges). In at least one example, fuselage <NUM> includes stops on and/or within the socket frame around portions of the opening <NUM>. In order to open the plug door, an initial outward motion is used to clear the stops, and a secondary pivotal motion is then used to open the plug door.

In at least one example, in order to open the door <NUM> (such as a plug door), an initial movement is inboard and up or down to clear the stops. One or more actuators <NUM> move the linkage(s) <NUM> (such as by turning) via one or more rods (such as the rod <NUM> (shown in <FIG> and <FIG>, for example) to provide the initial movement between the door <NUM> and the fuselage <NUM>.

The access system <NUM> further includes one or more actuators <NUM> secured to the door <NUM>. The actuator(s) <NUM> can be rotary motors, linear motors, and/or the like. The actuator(s) <NUM> is mounted onto and/or within the door <NUM>. The actuator(s) <NUM> are not secured to a floor <NUM> of the fuselage <NUM>. The actuator(s) <NUM> are separated from the floor <NUM>. One or more linkage(s) <NUM> couple the door <NUM> to the floor <NUM>. For example, the linkage(s) <NUM> connect the door <NUM> and/or the actuator(s) <NUM> to an underside of the floor <NUM> (such as to one or more frames, beams, or the like that form a portion of the floor <NUM>).

In at least one example, the door <NUM>, as a plug door, is opened by the actuator(s) <NUM> through two stages, such as through an initial outward pushing motion, and a secondary pivotal motion. In contrast to a shear door, in which all loading goes through the door, pressure loading in relation to a plug door occurs around the plug door, such as into a socket frame into which the plug door mates into a closed position.

The vehicle <NUM> can also include an access panel <NUM> that allows an operator to selectively open and close the door <NUM>. The access panel <NUM> can be on an exterior or interior portion of the fuselage <NUM>, and proximate to the internal chamber <NUM>. For example, the access panel <NUM> can be above, below, or to a side of the opening <NUM>, outside of the internal chamber <NUM>. The access panel <NUM> can include one or more switches, buttons, keys, or the like that allow the actuator(s) <NUM> to be operated to selectively open and close the door <NUM>. In at least one example, the access panel <NUM> includes or is in otherwise communication with a control unit <NUM> that is configured to control operation of the actuator(s) <NUM>. In at least one example, the actuator(s) <NUM> includes the control unit <NUM>. As another example, the control unit <NUM> is separate and distinct from the actuator(s) <NUM>, and is in communication with the actuator(s) <NUM> through one or more wired or wireless connections. Optionally, the access system <NUM> does not include the access panel <NUM> and/or the control unit <NUM>.

As used herein, the term "control unit," "central processing unit," "unit," "CPU," "computer," or the like can include any processor-based or microprocessor-based system including systems using microcontrollers, reduced instruction set computers (RISC), application specific integrated circuits (ASICs), logic circuits, and any other circuit or processor including hardware, software, or a combination thereof capable of executing the functions described herein. Such are exemplary only, and are thus not intended to limit in any way the definition and/or meaning of such terms. For example, the control unit <NUM> can be or include one or more processors that are configured to control operation thereof, as described herein.

The control unit(s), such as the control unit <NUM>, are configured to execute a set of instructions that are stored in one or more data storage units or elements (such as one or more memories), in order to process data. For example, the control unit <NUM> can include or be coupled to one or more memories. The data storage units can also store data or other information as desired or needed. The data storage units can be in the form of an information source or a physical memory element within a processing machine. The one or more data storage units or elements can comprise volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. As an example, the nonvolatile memory can comprise read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable PROM (EEPROM), and/or flash memory and volatile memory can include random access memory (RAM), which can act as external cache memory. The data stores of the disclosed systems and methods is intended to comprise, without being limited to, these and any other suitable types of memory.

The set of instructions can include various commands that instruct the control unit(s), such as the control unit <NUM>, as a processing machine to perform specific operations such as the methods and processes of the various examples of the subject matter described herein. The set of instructions can be in the form of a software program. The software can be in various forms such as system software or application software. Further, the software can be in the form of a collection of separate programs, a program subset within a larger program or a portion of a program. The software can also include modular programming in the form of object-oriented programming. The processing of input data by the processing machine can be in response to user commands, or in response to results of previous processing, or in response to a request made by another processing machine.

The diagrams of examples herein can illustrate one or more control or processing units, such as the control unit <NUM>. It is to be understood that the processing or control units can represent circuits, circuitry, or portions thereof that can be implemented as hardware with associated instructions (e.g., software stored on a tangible and non-transitory computer readable storage medium, such as a computer hard drive, ROM, RAM, or the like) that perform the operations described herein. The hardware can include state machine circuitry hardwired to perform the functions described herein. Optionally, the hardware can include electronic circuits that include and/or are connected to one or more logic-based devices, such as microprocessors, processors, controllers, or the like. Optionally, the control unit(s), such as the control unit <NUM>, can represent processing circuitry such as one or more of a field programmable gate array (FPGA), application specific integrated circuit (ASIC), microprocessor(s), and/or the like. The circuits in various examples can be configured to execute one or more algorithms to perform functions described herein. The one or more algorithms can include aspects of examples disclosed herein, whether or not expressly identified in a flowchart or a method.

As described herein, the access system <NUM> for the vehicle <NUM> includes the door <NUM> moveably coupled to a portion of the fuselage <NUM>. The door <NUM> is configured to be moved between an open position in which the opening <NUM> of the internal chamber <NUM> is opened, and a closed position in which the opening <NUM> of the internal chamber <NUM> is closed. The one or more actuators <NUM> are secured to the door <NUM> (for example mounted on and/or within the door <NUM>). The one or more actuators <NUM> are configured to move the door <NUM> between the open position and the closed position. In at least one example, the access system <NUM> also includes one or more linkages <NUM> coupled to the one or more actuators <NUM>. The one or more actuators <NUM> are configured to move the one or more linkages <NUM> to move the door <NUM> between the open position and the closed position. In at least one example, the one or more linkages <NUM> connect to a portion of the floor <NUM> within the fuselage <NUM>. In at least one example, the door <NUM> is a plug door that is configured to mate with a socket frame surrounding the opening <NUM> when the door <NUM> is in the closed position.

<FIG> illustrates an isometric top internal view of the access system <NUM> within the fuselage <NUM>, according to an example of the present disclosure. The fuselage <NUM> includes outer walls <NUM> that define an interior space <NUM>. The floor <NUM> spans between internal surfaces of the outer walls <NUM> within the interior space <NUM>. The floor <NUM> includes a plurality of support beams <NUM> (for the sake of clarity, floor panels are now shown in <FIG>). The floor <NUM> separates a passenger area <NUM> from a cargo hold <NUM>. The passenger area <NUM> is above the floor <NUM>, and the cargo hold <NUM> is below the floor <NUM>.

The access system <NUM> includes the door <NUM> that is moveable between a closed position and an open position. As shown in <FIG>, the door <NUM> is in a closed position. The door <NUM> is a plug door that closes into a socket frame <NUM> surrounding the opening <NUM>.

<FIG> illustrates an isometric internal view of the access system <NUM> of <FIG> having the door <NUM> in a partial open position. The access system <NUM> includes an actuator <NUM> mounted onto an internal surface <NUM> of the door <NUM>. For example, a mounting plate <NUM> is secured to (for example, mounted on or to) the internal surface <NUM> of the door <NUM>, such as through one or more fasteners, adhesives, and/or the like. The mounting plate <NUM> is connected to the door <NUM> through a plurality of brackets. The actuator <NUM> is secured to the mounting plate <NUM>, such as through one or more fasteners, adhesives, and/or the like. In at least one example, the actuator <NUM> is a rotary motor coupled to a rod <NUM>, which is coupled to a first linkage 116a and a second linkage 116b opposite from the first linkage 116a. The first linkage 116a and the second linkage 116b include a plurality of arms <NUM>, which can be pivotally coupled together via pivot pins, such as at ends thereof. The rod <NUM> can, in turn, be coupled to one or more pistons, drive screws, and/or the like that are configured to drive motion of the first linkage 116a and the second linkage 116b. The first linkage <NUM> and the second linkage <NUM> are, in turn, secured to an underside <NUM> of the floor <NUM>, such as to lower surfaces of one or more support beams <NUM>, such as through brackets, fasteners, adhesives, and/or the like. As shown, the actuator <NUM> is secured to the door <NUM>, but not the floor <NUM>.

<FIG> illustrates a lateral view of the access system <NUM> of <FIG> having the door <NUM> in a fully open position. Referring to <FIG>, the door <NUM> is a plug door that is configured to open and close in relation to the socket frame <NUM>. The actuator <NUM> operates to drive the rod <NUM>, which in turn drives motion of the first linkage 116a and the second linkage 116b to first linearly and outwardly move the door <NUM> away from the socket frame <NUM> in the direction of arrow A into an initial position, and then pivotally move the door <NUM> into the open position in the direction of arc B. Because the actuator <NUM> is secured to the door <NUM>, instead of the floor <NUM>, a smaller and/or lighter floor can be used, as there is no need to support the actuator with respect to the floor <NUM>. Further, it has been found that mounting the actuator <NUM> to the door <NUM>, instead of the floor, leads to a move efficient manufacturing process that is less time and labor intensive. Further, a smaller floor provides a smaller cross-section of an aircraft, which reduces weight of the aircraft, and drag during flight.

<FIG> illustrates an isometric internal view of the access system <NUM> having a door in a partial open position. <FIG> illustrates a lateral view of the access system <NUM> of <FIG> having the door in a fully open position. Referring to <FIG> and <FIG>, in at least one example, the access system <NUM> includes the door <NUM>, such as a plug door that is configured to open and close in relation to the socket frame <NUM>. The mounting plate <NUM> is secured to the internal surface <NUM> of the door <NUM>. A first actuator 112a and a second actuator 112b are secured proximate to opposite sides of the mounting plate <NUM>. The rod <NUM> connects the first actuator 112a to the second actuator 112b. Optionally, a rod may not connect the first actuator 112a to the second actuator 112b.

The first actuator 112a is operatively coupled to the first linkage 116a, and the second actuator 112b is operatively coupled to the second linkage 116b. The first linkage 116a and the second linkage 116b can include one or more pivotal arms <NUM> and <NUM>, which connect to the underside of the floor <NUM>, such as via brackets <NUM>. The actuators 112a and 112b can be rotary motors that are configured to drive motion of the linkages 116a and 116b to move the door <NUM>, which is a plug door, between open and closed positions. As shown in <FIG>, the mounting plate <NUM> is mounted on the internal surface <NUM> of the door <NUM> through a plurality of brackets <NUM>.

<FIG> illustrates an isometric internal view of the access system <NUM> having the door <NUM> in a partial open position. <FIG> illustrates a lateral view of the access system <NUM> of <FIG> having the door <NUM> in a fully open position. Referring to <FIG> and <FIG>, the mounting plate <NUM> can further be pivotally coupled to a portion of the socket frame <NUM> above the opening <NUM>, and to pivot brackets <NUM> extending inwardly from the internal surface <NUM>. The mounting plate <NUM> can include legs <NUM> that are configured to move through tracks <NUM> on the internal surface <NUM> of the door <NUM>. As shown, the access system <NUM> includes two actuators 112a and 112b operatively coupled to respective linkages 116a and 116b, as described above.

<FIG> illustrates an isometric internal view of the access system <NUM> having the door <NUM> in a partial open position. <FIG> illustrates a lateral view of the access system of <FIG> having the door <NUM> in a fully open position. Referring to <FIG> and <FIG>, in this example, the actuators 112a and 112b can be linear motors secured to door <NUM>. Again, the actuators 112a and 112b are not mounted onto an underside of the floor <NUM>, but are coupled to linkages 116a and 116b that connect to the floor <NUM>.

<FIG> illustrates a perspective front view of an aircraft <NUM>, according to an example of the present disclosure. The aircraft <NUM> is an example of the vehicle <NUM>, shown in <FIG>. The aircraft <NUM> includes a propulsion system <NUM> that includes engines <NUM>, for example. Optionally, the propulsion system <NUM> may include more engines <NUM> than shown. The engines <NUM> are carried by wings <NUM> of the aircraft <NUM>. In other examples, the engines <NUM> may be carried by a fuselage <NUM> and/or an empennage <NUM>. The empennage <NUM> may also support horizontal stabilizers <NUM> and a vertical stabilizer <NUM>.

The fuselage <NUM> of the aircraft <NUM> defines an internal cabin <NUM>, which includes a flight deck or cockpit, one or more work sections (for example, galleys, personnel carry-on baggage areas, and the like), one or more passenger sections (for example, first class, business class, and coach sections), one or more lavatories, and/or the like.

Alternatively, instead of an aircraft, examples of the present disclosure may be used with various other vehicles, such as automobiles, buses, locomotives and train cars, watercraft, spacecraft, and the like. Further, examples of the present disclosure may be used with respect to fixed structures, such as commercial and residential buildings.

<FIG> illustrates a flow chart of a method of manufacturing an access system for a vehicle, according to an example of the present disclosure. Referring to <FIG> and <FIG>, at <NUM>, one or more actuators <NUM> are secured to a portion of a door <NUM>. In at least one example, the door <NUM> is a plug door. At <NUM>, the one or more actuators <NUM> are operatively coupled to one more linkages <NUM>. At <NUM>, the one or more linkages <NUM> are connected to a portion of a floor <NUM> within a fuselage <NUM> of a vehicle <NUM>. Optionally, the one or more linkages <NUM> can first be connected to the portion of the floor <NUM>. The actuator(s) <NUM> can then be operatively coupled to the linkage(s) <NUM>.

Referring to <FIG>, examples of the present disclosure provide access systems <NUM> that include a door <NUM>. In at least one example, the door <NUM> is a plug door (in contrast to a shear door). The access systems <NUM> includes one or more actuators <NUM> that are secured to (for example, mounted to and/or within) the door <NUM>, instead of being mounted to the floor <NUM>.

As explained herein, certain examples of the present disclosure provide a door of a vehicle, such as a commercial aircraft, that can be efficiently manufactured. Further, examples of the present disclosure provide a plug door of a vehicle that allows for increased space and capacity within an internal cabin. Also, examples of the present disclosure provide a plug door that exerts less stress and fatigue on a floor of a vehicle. Additionally, examples of the present disclosure provide efficient and effective methods of manufacturing a plug door of a vehicle. Also, examples of the present disclosure provide efficient methods of operating a plug door of a vehicle.

It is to be understood that the above description is intended to be illustrative, and not restrictive. For example, the above-described examples (and/or aspects thereof) can be used in combination with each other. In addition, many modifications can be made to adapt a particular situation or material to the teachings of the various examples of the disclosure. While the dimensions and types of materials described herein are intended to define the parameters of the various examples of the disclosure, the examples are by no means limiting and are exemplary examples. Many other examples will be apparent to those of skill in the art upon reviewing the above description. The scope of the various examples of the disclosure should, therefore, be determined with reference to the appended claims. In the appended claims and the detailed description herein, the terms "including" and "in which" are used as the plain-English equivalents of the respective terms "comprising" and "wherein. " Moreover, the terms "first," "second," and "third," etc. are used merely as labels, and are not intended to impose numerical requirements on their objects.

Claim 1:
An access system (<NUM>) for a vehicle (<NUM>), the access system (<NUM>) comprising:
a door (<NUM>) moveably coupled to a portion of a fuselage (<NUM>), wherein the door (<NUM>) is configured to be moved between an open position in which an opening (<NUM>) of an internal chamber (<NUM>) is opened, and a closed position in which the opening (<NUM>) of the internal chamber (<NUM>) is closed;
one or more actuators (<NUM>) secured to the door (<NUM>), wherein the one or more actuators (<NUM>) are configured to move the door (<NUM>) between the open position and the closed position; and
wherein the one or more actuators (<NUM>) are secured to a mounting plate (<NUM>), wherein the mounting plate (<NUM>) is mounted on an internal surface (<NUM>) of the door (<NUM>), characterized in that the mounting of the mounting plate (<NUM>) on the internal surface (<NUM>) of the door (<NUM>) is through a plurality of brackets (<NUM>, <NUM>).