Abstract: A control device for a construction machine includes an operational amount data acquisition unit configured to acquire operational amount data indicating an operational amount of the working unit, an operation determination unit configured to determine a non-operation state of a bucket on the basis of the operational amount data, a bucket control determination unit configured to determine whether bucket control conditions are satisfied, on the basis of determination of the non-operation state, and a working unit control unit configured to output a control signal for controlling the bucket to maintain a state of the working unit, when the bucket control conditions are determined to be satisfied.

Abstract: Methods and systems for operating an industrial machine. One system includes a controller that includes an electronic processor. The electronic processor is configured to calculate an eccentricity of a center of gravity of the industrial machine with respect to a center of a bearing propelling the industrial machine and calculate a ground pressure associated with the bearing based on the eccentricity of the center of gravity. The electronic processor is also configured to set a maximum torque applied by an actuator included in the industrial machine to a value less than an available maximum torque based on the eccentricity of the center of gravity and the ground pressure.

Abstract: One exemplary embodiment is a grading tool comprising a frame extending between a hitch and a ground contacting member. A first adjustment mechanism and a lever are coupled with the frame. A suspension assembly including a spring is coupled with the lever. A grading box assembly is coupled with the frame and with the suspension assembly. The spring is compressible to accommodate motion between the lever and the grading box assembly. A second adjustment mechanism is coupled with the frame and the grading box assembly and is adjustable to selectably increase and decrease in length. A fixation member is coupled with the grading box assembly and is selectably coupleable with the frame to fix a first side of the grading box assembly vertically relative to the frame while allowing vertical movement of a second side of the of the grading box assembly relative to the frame.

Abstract: A wheel loader comprises a console box and a support component. The console box is disposed on the side of an operator's seat and is able to rotate in the forward and backward direction. The support component has a rotary shaft disposed in the left and right direction under the console box, and rotatably supports the console box around the rotary shaft between an operation position in which the console box is disposed horizontally and a retracted position in which the console box is rotated rearward from the operation position and is disposed at an angle. The location of the center of gravity of the console box is disposed more to the front than the rotary shaft at the operation position, and more to the rear than the rotary shaft at the retracted position.

Abstract: A bulldozer includes a steering clutch, a steering brake, a hydraulic pump that discharges a lubricating oil, a first lubricating oil supply path, a second lubricating oil supply path, a third lubricating oil supply path, and a flow amount switching valve disposed on the second lubricating oil supply path. The first lubricating oil supply path supplies a portion of the lubricating oil discharged by the hydraulic pump to the steering clutch The second lubricating oil supply path supplies a portion of the lubricating oil discharged by the hydraulic pump to the steering brake. The third lubricating oil supply path supplies, to the steering brake, a portion of the lubricating oil that has passed through the steering clutch. The flow amount switching valve switches an amount of the lubricating oil supplied to the steering brake.

Abstract: The present invention relates to a power transmission arrangement for a construction vehicle, comprising an engine, a hydraulic power system for powering work hydraulics of the construction vehicle, which is feedable with power from the engine, the hydraulic power system including a power limiter for limiting the power supply of the engine to the hydraulic power system to different power limit values, a drivetrain power system for powering locomotion of the construction vehicle, the drivetrain power system being feedable with power from the engine, a determining device for determining an operational state of the construction vehicle, and a controller configured to control the power limiter to limit the power supply of the engine to the hydraulic power system to different power limit values, these power limit values being set depending on the operational state of the construction vehicle determined by the determining device.

Abstract: A work machine control system includes a shape detection unit and a construction information generation unit. The shape detection unit detects an object to be constructed and outputs shape information representing a three-dimensional shape of the object. The construction information generation unit acquires the shape information from the shape detection unit and determines, using the shape information, target construction information as a target of construction of the object to be constructed.

Abstract: A tool for temporarily holding a bolt within a through hole defined by the mating engagement of first and second members includes a beam member having a proximal end and a distal end. An arm mounted to the beam member includes a clamp end sized to engage at least a portion of a first side of an assembly defined by the mating engagement of the first and second members. A bolt support member mounted to the distal end of the beam member holds the head of the bolt against the second side of the assembly when the clamp end of the arm is engaged with the first end of the assembly.

Abstract: Embodiments of the present invention include devices and methods for detecting water loss and consumption from commercial and residential commodes. In one aspect, the device comprises a valve for water control. The water flow control device includes: (i) an inlet in fluid communication with a flow sensor, (ii) a shut-off assembly located downstream of and in fluid communication with the flow sensor, (iii) a controller configured to receive input from the flow sensor and configured to send a signal to the shut-off assembly, and (iv) an outlet located downstream of and in fluid communication with the shut-off assembly.

Abstract: A water management system effective for managing and metering water usage and detecting and reducing water leaks is described herein. The water management system can detect a leak when a volume of water flow or change in water pressure detected by a water meter of the system is uncharacteristic for a given day and time of day at the node. Upon detecting the leak, the system alerts the user, and in some situations, remotely shuts off a water supply to preemptively address a water leakage issue.

Abstract: An apparatus includes a hydrant assembly 102 configured for use with a well casing 900, a pitless adapter 902, and a pump assembly 904. The hydrant assembly 102 includes a water spout assembly 104 configured to be positioned above the ground 906 and also above the well casing 900. A water pipe assembly 106 is configured to be in fluid communication with the pitless adapter 902, the pump assembly 904 and the water spout assembly 104. This is done in such a way that water flows from the pump assembly 904, past the pitless adapter 902 and toward the water spout assembly 104 once the pump assembly 904 is activated. A pipe-support assembly 108 is configured to be positioned relative to the well casing 900, the pitless adapter 902 and the pump assembly 904.

Abstract: A vent cover is described herein which may be used with various flush valve assemblies, particularly those acceptable for high efficiency and high performance toilets, which vent cover has a wall that includes an upper portion, a lower portion configured to define a vent cover inlet opening for receiving air and/or liquid passing upwardly from within a valve body and/or from within a toilet through a toilet inlet when the vent cover is installed on a valve body, an exterior surface, and an interior surface defining a vent cover passage for air passing upwardly from the vent cover inlet opening.

Abstract: Some embodiments include a toilet flush lever assembly that automatically releases a flush lever arm to stop a flush prior to a user releasing the flush handle. Some embodiments include a handle, a rotatable linkage coupled to the handle, and a flush lever in contact with the rotatable linkage, where rotation of the handle starts the flush. Further, some embodiments include a release mechanism for releasing the flush lever from the rotatable linkage when the handle has been rotated to a pre-determined point of rotation, thereby shutting off the flush.

Abstract: A sanitary washing device includes: a sprayer that jets a liquid to a surface of a toilet bowl portion of a toilet bowl; and a movable-type scattering suppression member that is movable between a closed position and an opened position and suppresses the liquid jetted from the sprayer from scattering to an upper surface side of the toilet bowl at the opened position.

Abstract: A flexible check valve for fluid-handling systems that prevents reverse flow but allows downstream flow of fluid comprises a dome that fits within a pipe and includes a concave surface. The flexible check valve further includes a flexible seat that fits within the pipe and includes a. convex surface. The flexible seat is deformable from a closed position, that prevents reverse flow, to an open position, that allows downstream flow, when an upstream pressure acts on the flexible seat and exceeds a downstream pressure and when, in the closed position, the concave surface of the dome is oriented downstream and the convex surface of the flexible seat is oriented upstream. A housing is connected to the dome and the flexible seat and is connectable to the pipe. A seal is formed between the concave surface and the convex surface when the flexible check valve is in the closed position.

Abstract: The device herein disclosed and described provides a water collection system that separates the initial flush of rainwater, which contains higher concentrations of undesirable contaminants from later received rainwater having lower concentrations of contaminants to be stored for later use or to be discharged directly to receiving bodies of water. The device contains a cistern for treating first flush rainwater, a basin for receiving water in fluid connection with the cistern and a water storage tank, a water diversion channel that diverts first flush rain water to the cistern and additional rainwater to a water storage tank, a floatation device on a connecting rod affixed to the diversion channel that acts to operate the diversion channel when the water in the cistern achieves a desired height by diverting the additional water received to the water storage tank.

Abstract: A protected drain assembly comprising a drain which is at least partially bordered by a hard surface, and which is protected by a drain cover assembly which comprises (A) a laminar sheet which (i) is on top of the drain and (ii) comprises a central portion which, when a sediment-containing liquid is placed on top of it, allows the liquid to pass through it, and (B) gaskets which (i) are attached to edges of the laminar sheet and (ii) secure the edges of the laminar sheet to the hard surface.

Abstract: A drain cleaner including a snake configured to be inserted into a drain, a conduit through which the snake extends, where the conduit includes an attachment member, and a linkage including a first engagement element on a first end and a second engagement element on a second end opposite the first end. The first engagement element is coupled to the attachment member of the conduit. The drain cleaner further includes an adapter having a first end coupled to the second engagement element of the linkage and a second end configured to be received by an operation portion of a power tool.

Abstract: The invention relates to a medical container unit for designing and/or manufacturing an implant, comprising a plurality of container subunits, each of which forms a sector, is equipped with at least one means for designing and/or manufacturing an implant, and is formed by self-supporting partial substructures on at least two sides.

Abstract: An architectural structure of a modular container house includes: a building body with plural floors each having at least one accommodating space with an external opening; at least one external access area longitudinally disposed at the building body, and each accommodating space being communicated with external access area; and plural container houses, respectively and movably disposed in the accommodating spaces through the openings, and at least one side board of each container house can be spread open and placed horizontally on a ground of each accommodating space, so that the interior of each container house is communicated with each respective accommodating space.

Abstract: A modularly-built, or equivalent in assembled prefabricated kit of parts (KOPs), building system assembled to form multiple units and multiple stories comprising of generally rectangular stacked volume load bearing modules with optional prefabricated exteriorly-attached components, including a typical unit floor plan layout of at least two adjacently-arranged modules. The floor plan layout is adjustable by division or separation, alteration, or expansion from the unit's/units' original layout. All primary rooms along a unit's/units' perimeter receives natural light and natural cross- and induced-ventilation from at least two exterior non-parallel walls through windows and/or doors. Optionally, an assembly of at least two 2-story buildings could frame, or one 2-story building could incorporate, an in-between or centrally located vegetated courtyard garden. Such courtyards can be outfitted with roofs and sidewalls with fixed or operable louvers.

Abstract: A composite wall assembly edge joint, includes a first composite buildup pad secured to a first composite face sheet with the first composite buildup pad having a first tapered section with a first inclined surface which extends in a first direction and having a second section which extends from the first tapered section with a second surface which extends in a second direction, different from the first direction, toward a first end of the first composite face sheet. The assembly further includes a composite flute core member, having a tapered first portion secured to the first tapered section; a second portion secured to the first composite face sheet; and a third portion which extends in the second direction, away from the tapered first portion, toward the first end of the first composite face sheet secured to the second section.

Abstract: A wall construction panel 1 for the setting up of walls for exhibition stand construction includes four frame elements 2, 3, 4, each of which having a groove and being connected to a rectangular frame with a peripheral frame groove pointing to the frame inside. The frame groove is formed by the grooves of the frame elements 2, 3, 4 and a panel 5 is inserted into the frame groove. Two of the four frame elements 2, 3, 4 are configured as frame elements 2, 3 extending in a vertical direction Y, one of which is configured as a pillar element 2 and the other one as an edge element 3. Two others of the four frame elements 2, 3, 4 are configured as framework elements 4 extending in a horizontal direction X where each of the framework elements 4 bears with a horizontal end on the pillar element 2 and the edge element 3 is placed with a first horizontal section 31 between the framework elements 4 and projects with a second horizontal section 32 horizontally over the framework elements 4.

Abstract: A roof edging system that includes a base anchor, a fascia cover, and a compression system that is used to provide compression thereby, allowing the fascia cover to snap into place on the base anchor.

Abstract: A roof edging system that includes a base anchor, a fascia cover, and a compression system that is used to provide compression thereby, allowing the fascia cover to snap into place on the base anchor.

Abstract: A trellis system having a trellis structure that is installable to extend generally outwardly from a vertical supporting member. The trellis structure includes at least one internal mounting bracket by which the trellis structure is securable to the vertical supporting member. The internal mounting bracket has a unitary member having a flange portion and a web portion, the flange portion being securable to the vertical supportable member by fasteners and the web portion extending outwardly orthogonally from the flange portion and being couplable to one of the plurality of outwardly extending tube structures. A tube structure has a flange opening and a front opening sized to receive the web portion. The web portion passes through the front opening. The web portion has an alignment structure sized to be received within one of the outwardly extending tube structures in close fitting relation to an interior of the outwardly extending tube structure.

Abstract: A building construction system of includes a prefinished exterior weather-tight insulating skin (panel), a cavity and structural zone where electrical, mechanical, plumbing, HVAC, data/audio systems can run freely and be modified, and a prefinished interior wall panel which is easily removable allowing access to the cavity and structural zone. The exterior and interior panels are mounted to structural components and create the cavity therebetween.

Abstract: Disclosed herein is a structure for supporting an access floor panel, which includes a plurality of X-axis beams arranged to be spaced apart in an X-axis direction, each having an X-axis guide groove formed on a center of an upper surface thereof in the X-axis direction, a plurality of Y-axis beams arranged to be spaced apart in a Y-axis direction at the same height as the X-axis beams, each having a Y-axis guide groove formed on a center of an upper surface thereof in the Y-axis direction, a post configured to have a post head and support each of the X-axis beams and an associated one of the Y-axis beams, and a connection bracket configured to fix each of the X-axis beams and an associated one of the Y-axis beams to the post head.

Abstract: Provided herein are exemplary floor installation tools comprising a base having a total length L 2, a receded portion of the base having a length L 1, an impact edge having a vertical height H 3 and forming a right angle with the receded portion of the base, a rounded nose, the rounded nose having an internal angle of approximately sixty degrees, a strike plate forming a sixty degree angle with the rounded corner, the strike plate configured for receiving a force for transfer to the impact edge, and a handle adjacent to the strike plate, the handle mounted in a middle of the base.

Abstract: Disclosed is a founding system for mounting in the interior of a structure having rounded interior walls, such as a coker. The founding system includes one or more generally horizontal support layers. In one example, each horizontal support layer has four support beams and four connection elements mounting the support beams. Each connection element has a flat edge tangential to the rounded interior walls of the structure, a foot extending from the flat edge to abut the interior of said rounded interior walls, and two mounts for mounting two of the support beams at an angle of about 90 degrees.

Abstract: According to one embodiment an extractor is provided that comprises a stem with a handle at one end and a conical spacer engagement device cooperating with the conical spacer for extracting it from the concrete wall at the other end. The extractor also comprises a mobile element which is displaceable by a user along the stem between a retracted position to which said mobile element is moved in order to contribute to the extraction of the conical spacer, and an advanced position to which the mobile element is moved in order to push the conical spacer, releasing it from the conical spacer engagement device. When the conical spacer engagement device is fixed to the conical spacer, then the mobile element is moved to the retracted position, the corresponding conical spacer being extracted. The mobile element is then moved again to the advanced position, releasing the conical spacer from the conical spacer engagement device.

Abstract: This invention discloses a rack structure for an in-field 3D construction printer, which comprises the vertical supporting posts consisting of connected standard vertical supporting post segments in two rows with symmetrical arrangement, a printing platform, a power and material storage platform, and lifting mechanism; said two rows of the vertical supporting posts are symmetrically arranged and fixed on the ground; the printing platform, and the power supply and material storage platform are fixed on the vertical supporting post through their respective cavities, and then the printing platform and the power and material storage platform are bolted on the vertical supporting post; the steel wire rope runs through a lifting drum, to a pulley block on the side of the power supply and material storage platform, and then from the intermediate pulley block to the pulley block on the side of the printing platform.

Abstract: A fixing device for a safety screen includes a bracket, a support member and a locking member. The support member includes a plurality of openings, and two of the openings include keyhole slots that are spaced from one another along the support member. Each of the keyhole slots include an enlarged portion and a slot. The bracket includes at least one engagement member that has a shank portion and a head. The head is receivable through the enlarged portion thereof. The shank portion is receivable by the slot of any of the keyhole slots, and the locking member is attached to the bracket. The bracket is engageable with the support member by inserting the head through the enlarged portion. The locking member is engageable with the support member following translational movement of the engagement member along the slot, the locking member thereby locking the engagement member against translational movement.

Abstract: A cover lift system for a spa includes a lifter handle having an upper arm and a lower arm telescopically connected to the upper arm, the upper arm being configured for operative connection to a cover of a spa, and the lower arm being configured for pivotal connection to a base of the spa, and an adjuster mechanism associated with the lifter handle for selectively adjusting a length of the lifter handle to allow for use of the lifter handle with spas of varying sizes.

Abstract: A carriage for handling a vehicle in an automatic parking system includes a frame axially movable along a first longitudinal axis, rotating clamps, each including a pair of counter-rotating arms rotating with respect to a vertical axis orthogonal to both the longitudinal axis and the transverse axis. The carriage includes a transverse-centering unit with transverse pushers, transversely extensible, moving along an axis parallel to the transverse axis and independent of the rotating clamps. In a first retracted position they do not interact with the vehicle wheels. When extended, they come into contact with at least one vehicle wheel. The extensible transverse pushers are on left and right sides of the carriage, and simultaneously move in a symmetrical extension, being operated by a respective motor positioned laterally of the longitudinal axis of the carriage. The extensible transverse pushers include a pantograph for longitudinally aligning the vehicle along the longitudinal axis.

Abstract: Systems and methods for controlling the vertical position of a building are disclosed. In one arrangement a system is provided in which a jacking system is capable of moving the building vertically relative to a foundation structure supporting the weight of the building and the jacking system comprises at least one screw jack. In another arrangement a system is provided in which a controller uses the jacking system to control the vertical position of the building in response to data about one or more physical properties of the environment in or around the building input to the controller.

Abstract: The disclosure includes a fence post support system comprising an elongate shell having an open upper end, a closed lower end that is opposite the open upper end, a hollow inner portion, and sidewalls that surround the hollow inner portion. The system can also include a plurality of drain openings extending through the closed lower end. Additionally, the system can include a first sidewall extending from a first portion of the elongate shell.

Abstract: A modular drilling rig system includes multiple components. The system is transfigurable between a transport mode and an operational mode, and includes a drilling rig mast which is positionable in a vertical orientation; and a base structure adapted to be positioned on a surface near the well centre to support the drilling rig mast thereon. The base structure includes two elongated members that are connected to each other by a cross beam; and a displacement system to displace the drilling rig with respect to the surface in a horizontal direction. The displacement system is configured to displace the two elongated members of the base structure together in order to displace the drilling rig, and is configured such that the two elongated members can be displaced with respect to each other when the two elongated members are not connected to each other.

Abstract: A tamper-proof lock includes: a housing, shaft/handle, cam, lever, spring, and plate. The shaft is pivotally mounted in a housing orifice, with the cam pivotally mounted to the shaft. The cam has first and second shaped openings at first and second respective radial positions, and an arcuate recess. The lever is secured to the shaft, and has a protrusion that alternately engages each of first and second ends of the arcuate recess to respectively/selectively drive the cam to rotate/counter-rotate in first and second directions, into locked and unlocked cam positions. The spring biases the plate for a protrusion thereon to be respectively received within each of first and second shaped cam openings, when aligned therewith at those cam positions, and for a curved surface of the plate to be correspondingly received within first and second curved cam recesses, respectively, when aligned therewith, which facilitate withdrawal of the plate protrusion.

Abstract: An exemplary status-indicating locking assembly includes a cylindrical lock assembly and a status-indicating assembly. The status-indicating assembly includes a sensor configured to sense the status of the cylindrical lock assembly, a transmission configured to communicate the lock status to at least one side of a door, and an indicator configured to display indicia relating to the lock status on the at least one side of the door. In certain forms, the sensor, transmission, and indicator may be electronic, mechanical, hydraulic, magnetic, or combinations thereof.

Abstract: A rail for a utility pit includes: a top end; a bottom end distal from the top end; an outer face defining a curved radially outer surface, the radially outer surface configured to mount on an inner surface of the utility pit; an inner face distal from the outer face and defining a radially inner surface; a center-lock strike portion proximate to a first side end of the rail, the center-lock strike portion defining a center-lock strike notch in the bottom surface; and a side-lock strike portion distal from the first side end, the side-lock strike portion defining a side-lock strike notch, the side-lock strike notch defining a central wall and a pair of side walls extending radially inward from the central wall, a surface of each of the pair of side walls angled with respect to the central wall.

Abstract: A portable electronic lock for luggage, comprising: a housing and a securement member in cooperation with the housing to secure an item to the lock; a locking mechanism in the housing in communication with the securement member to releasably secure the securement member to the housing; a communications module in the housing for operating the locking mechanism to release and secure the securement member in response to a wireless signal; and a secondary release system for releasing the locking mechanism, wherein the secondary release system is selectively operable by a user.

Abstract: A bicycle lock including a lock body having a locked state and an unlocked state. A movable shackle is operatively coupled to the lock body, wherein the lock body in the locked state prevents movement of the movable shackle, and wherein the lock body in the unlocked state enables movement of the movable shackle. A pawl is mounted to one of the lock body and the movable shackle. A rack is configured to engage the pawl, and wherein the unlocked state of the lock body enables at least one of bidirectional movement of the pawl and rotational movement of the rack away from engagement with the pawl.

Abstract: A vehicle door latch device comprises a latch; a ratchet for releasing the latch; a first lever that can rotate in a releasing direction from an initial position due to releasing of the ratchet, a synthetic resin part being fixed to a metal part on the first lever; a first spring biasing the first lever toward the initial position, a second lever pivotally mounted to the first lever via a second shaft at a certain angle and rotating from the initial position to a block position for preventing the first lever from rotating in a releasing direction; a second spring comprising a torsion spring for biasing the second lever toward the initial position; and a holding member made of the synthetic resin part and holding a coil of the second spring.

Abstract: The aim of the invention is to be able to constantly open a locking mechanism of an electrically actuated lock of a motor vehicle with sufficiently large force, without having to provide an excessively large electric motor and/or an excessively large gearing transmission ratio for this purpose. In order to solve the problem, a lock for a motor vehicle comprises a locking mechanism (3) and an actuator device for opening the locking mechanism (3). The actuation device comprises a rotatable actuator (1) which can be rotated by a motorised drive (15), in particular by an electric drive. A rotating of the actuator (1) brings about an unlocking, i.e. an opening, of the locking mechanism (3). The locking mechanism (3) can be opened independently of the direction of rotation of the actuator (1). Opening of the locking mechanism (3) is therefore not dependent upon a defined direction of rotation. The force with which the locking mechanism (3) is opened depends on the direction of rotation of the actuator (1).

Abstract: vehicle door handle assembly with a sensor device for detecting an actuation is provided. A handle of the handle assembly has a section which can be gripped from behind and an outer wall that delimits an interior in which an electronic sensor device is arranged and fixed. The handle section is formed with a reduced outer wall thickness in an actuation region and has a deformability that is increased with respect to the remaining sections of the handle. The outer wall thickness is reduced solely on the outer wall face oriented towards the interior. The handle outer wall inner face oriented towards the interior is coated with a metal layer at least in the actuation region. The electronic sensor device comprises at least one inductive distance sensor which lies opposite the metal layer in the interior of the handle to detect a deformation of the opposing outer wall.

Abstract: The invention relates to a securing device (1), which has a front hood (2) and a hood lock (3) with a lock holder (10), for a motor vehicle. The hood lock (3) has a rotary latch (4) with a pre-latching position and a main latching position in which the front hood (2) is closed and locked, an electric drive (5) which switches the rotary latch (4) from the main latching position into the pre-latching position, and a bayonet-type closure system (13) with a closed position, a release position, and an intermediate position. In the closed position, the rotary latch (4) is located in the main latching position; in the intermediate position, the rotary latch (4) is located in the pre-latching position and the lock holder (10) is engaged with the rotary latch (4); and in the release position, the lock holder (10) is released by the rotary latch (4) and the front hood (2) is unlocked.

Abstract: A hood lock apparatus includes a base plate having a striker groove into which a striker enters in response to a closing operation of a hood, a latch locking the striker entered into the striker groove, a locking plate locking the latch that locks the striker, a rattle lever supporting the striker locked by the latch with the latch, and a rattle spring biasing the rattle lever holding the striker with the latch towards the striker. The rattle spring is disposed to straddle a first center line passing through a rotational shaft of the rattle lever and extending in a direction at right angles to a direction in which the striker groove extends.

Abstract: A latch mechanism for a vehicle storage box may include a pair of pawls fixed on opposite sides of a coupler and configured to cause inward translation of one pawl in response to actuation at the other pawl, and a sliding element arranged between each of the pawls and the coupler, the sliding element including at least one retention mechanism to fix the pawl to the sliding element and further including a biasing element to compress the pawl to further engage the pawl with the retention mechanism.

Abstract: A door device with a locking mechanism includes an operation member that is operated to unlock a door body. When a power supply for a railroad car is normal, it is determined whether the door body is allowed to be opened by operating the operation member. The door body is unlocked only when it is determined that opening of the door body is allowed. Whereas when the power supply for the railroad car is in an abnormal state, the door body is unlocked by the locking mechanism by operating the operation member.