Abstract: A storage box comprises a housing with open ends and a tray that slides out either open end and up to at least fifty percent or up to at least sixty percent of the length of the tray may slide out either open end. Latch members operable from either open end of the housing selectively hold the tray in a centered position and can be released to allow the tray to slide out a selected end of the housing. Multiple latch member mating members may be associated with the housing for selective engagement by the latch members to latch the tray in multiple extended positions between the centered position and fully retracted positions out either the first or second open ends. Latch engagement members mounted on the doors engage latches connecting the tray to the housing when the doors are shut to prevent the latches from becoming unlatched when the doors are shut.

Abstract: An aerodynamic nose cone front trailer that uses a topographical view for reference extending the trailer front all the way to the hitch. The trailer design reduces wind resistance while improving the fuel economy and improving the handling.

Abstract: The present disclosure discloses a seat base sliding device applied to a seat of a heavy machinery such as a loader, an excavator, or the like. The seat base sliding device includes: a seat base with a lower part is fixed to a floor of a vehicle body and an upper part at which a seat is installed; a sliding plate slidable inwards and outwards in a lateral direction of the seat base at both left and right sides of the seat base and in which a control stand is fixed to one side thereof; and at least one adjustment unit selectively fixing the sliding plate of which the position is determined by sliding movement to the seat base. The present disclosure is capable of preventing a cabin from knocking against both control stands of a seat device at the time of assembling the cabin around the seat device and in addition, preventing the corresponding control stands from interfering in a thigh of a driver at the time of operating a control lever of each control stand laterally after assembling the cabin.

Abstract: A deck system for a vehicle having a cargo bed. The deck system includes a deck body that extends across at least a portion of the cargo bed. The deck body includes a plurality of planks, each plank having an upper surface, a lower surface, and first and second opposing edges, each first edge configured to interlock with the second edge of another plank. The plurality of planks are coupled together via their interlocking edges to form the deck body. The deck system may also include a rail assembly configured to be coupled to side rails of the cargo bed and to the deck body for supporting the deck body above the cargo deck. The first edge of each plank has at least one first hook member and the second edge of each plank has at least one second hook member, the at least one second hook member configured to engage with the at least one first hook member of another plank.

Abstract: A sealing system useful for sealing a slide out room in a recreational vehicle (RVs). The sealing system includes a first bulb seal that is adapted for being affixed to a transverse surface that defines an opening in a sidewall of the RV. A second bulb seal is affixed to a peripheral flange that extends from an end wall of the slide out room. Both of the bulb seals have an hourglass shape. The peripheral flange fits within the opening when the slide out room is in its retraced position and the bulb seals meet in a complementary fashion to form a seal. A wedge seal is included spaced inwardly on the sidewalls of the slide out room and is designed to contact the bulb seal attached to the opening when the room is extended. An internal flange is not required for sealing when the slide out room is extended.

Abstract: This invention relates to load bed for a vehicle, and in particular to a load bed adapted to carry elongate articles upon the public roads. The load bed could for example be the trailer of an articulated vehicle, or it could be part of a rigid truck, as desired. The load bed (214) has a set of retaining posts along the longitudinal sides of the bed, and at least one platform (224) is mounted upon the load bed and is movable between a stowed condition and an in use condition, the retaining posts being between the load bed and the platform in its in use condition.

Abstract: An enclosed trailer may comprise an enclosure having an interior defined by at least two lateral enclosure portions. The lateral enclosure portions are laterally movable between a contracted condition with a smaller interior volume and an expanded condition with a larger interior volume. The trailer may comprise a support frame including two lateral frame portions laterally movable between a contracted condition corresponding to the contracted condition of the lateral enclosure portions and an expanded condition corresponding to the expanded condition of the lateral enclosure portions. The trailer may further include a frame movement assembly configured to move the lateral frame portions between the expanded and contracted conditions, and a pair of wheels with each wheel being mounted on one lateral frame portion such that the wheels move laterally inward and outward with the frame portions as the frame portions move between the contracted and expanded conditions.

Abstract: An electromechanical travel bar lock assembly disables the flow of power to the power drive that moves a RV slide-out room between the traveling position and the deployed position. The assembly includes a bar for removably securing between the wall of the vehicle and the facer board of the slide-out room to prevent the room from moving. The travel bar is provided with an actuator that actuates, directly or indirectly, a switch means incorporated into the circuitry of the power drive so that power is not permitted to flow from its source to the drive, and the slide-out room cannot be moved when the travel bar is positioned between the vehicle wall and the facer board. The actuator, switch, and circuitry may embody any one of several different configurations and/or combinations.

Abstract: An extendible secondary living space for a vehicle. The extendible living space may move from a retracted position in which it is substantially integrated within or in close proximity to a primary living space of the vehicle, to an extended position in which it provides an open-air porch or balcony accessible from the primary living space. The extendible living space may be extended from any wall of the vehicle, such as a side wall or rear wall, and may be particularly well suited for use in motorized recreational vehicles.

Abstract: A mobile facility has a fixed frame, an expandable roof section, an expandable floor section, and an expandable side section. Interior space within the mobile facility is expanded by expanding the expandable roof section, the expandable floor section and the expandable side section.

Abstract: A mobile medical facility capable of treating a plurality of patients and being transported over the roadways without requiring extensive transporting means. In general the mobile medical facility includes a trailer. The trailer defines a floor area and has at least a first and second configuration. In the first configuration, the floor area is reduced to allow for transporting of the trailer over the public highways. In the second configuration, the floor area of the trailer is expanded and large enough to support a plurality of beds for treating patients. In some embodiments, the floor area in the second configuration may be at least twice as large as the floor area in the first configuration.

Abstract: A robot drive system preferably used for a vessel hull cleaning and/or inspection robot includes a first frame portion rotatably supporting a first axle with a first wheel thereon, and a second frame portion rotatably supporting a second axle with a second wheel thereon. A joint connects the first frame portion to the second frame portion and defines an expendable and contractible portion between the first frame portion and second frame portion. An actuator subsystem is configured expand and contract the expandable and contractible portion to move the first frame portion relative to the second frame portion at the joint to angle the first axle relative to the second axle to steer the robot.

Abstract: A recreational vehicle slide out system includes a mobile dwelling assembly with an outer wall having an opening extending therethrough. An extension is slidably mounted to the dwelling assembly. The extension includes an upper wall, a lower wall and an exterior wall. The exterior wall forms a covering for the opening when the extension is in a stored position. A lateral wall includes a first side edge and a second side edge. The first side edge is hingedly coupled to a lateral edge of the exterior wall. The lateral wall is pivotable into a closed position extending between the exterior wall and the outer wall when the extension is in an extended position. The lateral wall is pivoted to a position approximately orientated parallel to the exterior wall when the extension is in the stored position to prevent the lateral walls from substantially extending into the mobile dwelling assembly.

Abstract: A mechanism to affect the coordinated movement of an expandable room in a recreational vehicle. The mechanism comprises a drive chain assembly and a lift assembly. The drive chain assembly has a pair of drive chains (upper and lower) that move generally vertically along vehicle structural members and then the chains are redirected for horizontal travel as the main hydraulic cylinders are actuated to extend or retract the expandable room. The movement of the upper and lower drive chains is synchronized by a rack-and-pinion mechanism. The lift assembly controls vertical movement of the room so that when the room is fully extended, the floor of the vehicle and the floor of the expandable room are substantially flush. The lift assembly comprises at least one lift cylinder for raising and lowering the room. The lift cylinder is vertically combined with the lower end of the structural member.

Abstract: A camper trailer or caravan (10) includes a chassis (12) adapted to be attached to, and towed behind a motor vehicle (11). A housing (21) is mounted on the chassis (12) and defines a main chamber including a peripheral wall. The chassis (12) is short in length and about the same width as the towing vehicle (11) with the wheels (19) located adjacent the rear end of the chassis (12), and the housing (21) is adapted be opened such that panels (41) folded inside the housing when in the closed configuration are adapted to form annex chambers (42, 43) when in the open configuration when the camper trailer (10) is being used for camping and the like. A sleeping chamber (23) associated with the main chamber extends outside the peripheral walls of said camper trailer when required. Preferably there is a kitchen chamber and a bedding chamber within the housing of the camper trailer.

Abstract: Vessel (1) for a goods transport vehicle comprising two side walls (2) and a base (3), characterized in that it comprises means for the transverse movement (4) of the side walls (2) relative to the base (3). Advantageously, the means of transverse movement (4) are designed to move the bottom edges (5) of the side walls (2) in order to change the shape of the vessel from a basically rectangular shape to a basically U shape or vice versa. The present invention applies particularly to the transportation of bulk materials or made-up goods.

Abstract: A seal between a base structure and a slide out structure of a recreational vehicle includes a panel section mounted to the base structure, the panel section including a front edge, a rear edge, a first side and a second side. A sealing element extends from the panel section, between the front edge and the rear edge, in a direction from the first side toward the second side of the panel section, the sealing element extending to contact the slide out structure and wipe moisture therefrom upon relative movement of the slide out structure and base structure. A catch flange extends upwardly from the rear edge of the panel section. A first side basin detail extends from the first side of the panel section, and a second side basin detail extends from the second side of the panel section.

Abstract: A vehicle air guiding system in a rear area of the vehicle has a central air guiding element displaceable between a moved-in inoperative position into a moved-out operative position. Lateral air guiding elements, which are displaceable together with the central air guiding element, are telescopically displaceable relative to the central air guiding element while enlarging the transverse dimension of the air guiding system transversely to vehicle longitudinal direction from an also moved-in inoperative position into an also moved-out operative position. In the inoperative position, the lateral air guiding elements are pushed over the central air guiding element so that they rest against one another by way of the end sections and completely cover or envelop the central air guiding element.

Abstract: A slidable storage tray adapted to be hydraulically actuated between a retracted position wherein the tray is nested inside a vehicle's storage compartment and an extended position wherein at least a portion of the tray is located outside of the vehicle's storage compartment. The slidable storage tray is dual directional so that it extends from either a first side or a second side of the vehicle. The hydraulic circuit comprises a first hydraulic cylinder and a second hydraulic cylinder. The rod of the first cylinder is attached to the vehicle/storage compartment frame and the rod of the second cylinder is attached to the slidable storage tray. The two hydraulic cylinders are attached together so their barrels cannot move relative to one another. The two hydraulic cylinders are facing the same direction so that their rods both extend in the same direction.

Abstract: An expandable vehicle has slide-out sections in which one or more cog tracks are driven by a modular cog wheel drive assembly to move the slide-out sections in and out. The cog tracks can be integrated into the structure of the slide-out sections, and the slide-out sections are supported against tipping down both upon extension and retraction by a cable system that exerts a counter-moment on them in both directions.

Abstract: A vehicle such as a recreational vehicle includes a slide-out portion such as a slide-out compartment, slide-out patio, etc that moves between a retracted position and an extended position to increase the living space in the vehicle. The slide-out portion includes a second floor that is positioned adjacent to a main floor when the slide-out portion is retracted. A slide-out mechanism is used to move the second floor between the retracted position and the extended position. The second floor may be at least substantially flush with the main floor when the slide-out portion is in the extended position.

Abstract: A cable operated slide-out mechanism for a recreational vehicle has a linear actuator mounted in a fixed channel alongside the room or compartment and an end of each cable is fixed to the channel. Four cables are provided on each side of the slide-out, with two of the cables on each side fixed to the frame on the top and going to the outside of the slide-out, on the top and bottom, and the other two cables fixed to the frame on the bottom and going to the inside of the room on the top and bottom. Pulleys are provided at each end of the actuator rod to pull on the cables so as to move the room such that the room movement is double the stroke of the actuator.

Abstract: A truck bed assembly within which the width dimension of the bed's cargo space can be selectively adjusted, the assembly including laterally movable sidewalls that are constructed so as to widen the bed floor surface as they are moved outward as well as a laterally expandable tailgate that lengthens and shortens as the sidewalls are laterally expanded and retracted.

Abstract: An air guiding system for a vehicle, particularly for a passenger car, is arranged in a rear area of the vehicle and has a main air guiding element that can be displaced from a moved-in inoperative position into a moved-out operative position. Viewed in the longitudinal direction of the vehicle, the main air guiding element, while forming at least two main air guiding element sections, is divided such that, when the main air guiding element is displaced from the inoperative position into the operative position, at least lateral main air guiding element sections can be moved transversely to the longitudinal direction of the vehicle.

Abstract: A vehicle air guiding system in a rear area of the vehicle has a central air guiding element displaceable between a moved-in inoperative position into a moved-out operative position. Lateral air guiding elements, which are displaceable together with the central air guiding element, are telescopically displaceable relative to the central air guiding element while enlarging the transverse dimension of the air guiding system transversely to vehicle longitudinal direction from an also moved-in inoperative position into an also moved-out operative position. In the inoperative position, the lateral air guiding elements are pushed over the central air guiding element so that they rest against one another by way of the end sections and completely cover or envelop the central air guiding element.

Abstract: The invention provides an innovative and practical new class of crossover motor vehicles for carrying passengers and for carrying cargo in a cargo or pickup bed, while still being of sufficiently small dimensions as to be garage-able in many home garages. Representative embodiments can carry 6 or 7 or 9 persons in comfortable seats all with adjacent or facing seats for companions; plus substantial varied cargos, which can potentially include sporting or recreational equipment such as bicycles or a powered waterscooter or snowmobile or motorcycle; camping gear including a 9-person tent; furniture such as a Queen bed set; appliances such as a washer and dryer; utility equipment such as a snowblower or riding lawnmower; or substantial quantities of items such as lumber, bark or fertilizer.

Abstract: A truck bed assembly within which the width dimension of the bed's cargo space can be selectively adjusted, the assembly including laterally movable sidewalls that are constructed so as to widen the bed floor surface as they are moved outward as well as a laterally expandable tailgate that lengthens and shortens as the sidewalls are laterally expanded and retracted.

Abstract: An air guiding system for a vehicle, particularly a passenger car, that is arranged in a rear area of the vehicle and has at least one central main air guiding element displaceable from a moved-in inoperative position into a moved-out operative position. Lateral auxiliary air guiding elements are displaceable together with the or each central main air guiding element. The lateral auxiliary air guiding elements can be rotated like a folding knife with respect to the or each central main air guiding element in order to change them from an also moved-in inoperative position into an also moved-out operative position.

Abstract: An air guiding system for a vehicle, particularly for a passenger car, is arranged in a rear area of the vehicle and has at least one central main air guiding element that can be displaced between a moved-in inoperative position into a moved-out operative position. Lateral auxiliary air guiding elements are displaceable together with the at least one central main air guiding element. The lateral auxiliary air guiding elements can be displaced while enlarging the transverse dimension and while simultaneously enlarging the longitudinal dimension of the main air guiding element or the air guiding system from an also moved-in inoperative position into an also moved-out operative position.

Abstract: An air guiding system for a vehicle, particularly for a passenger car, arranged in a rear area of the vehicle and having at least one central main air guiding element that can be displaced from a moved-in inoperative position into a moved-out operative position. Lateral auxiliary air guiding elements are displaceable together with the, or each, central main air guiding element. The auxiliary air guiding elements can be swiveled with respect to the, or each, main air guiding element about at least two pivots fixed to the main air guiding element and in each case at least two pivots fixed to the auxiliary air guiding elements laterally beside the main air guiding element.

Abstract: A slide assembly is provided to couple a slide-out component disposed in an opening of a vehicle body to the vehicle body. The slide assembly includes a complementary contoured guide member, roller(s), and a support member, all generally enclosed by a mountable housing. The support member and roller(s) are coupled to roll along the guide member. In a particular embodiment, rollers are mounted in pairs on the top and bottom sides of the guide member. Due to the complementary contours of the roller and guide member, the slide assembly has a self-aligning characteristic. In one embodiment, the guide member includes a single portion that is horizontal with respect to the vehicle body, and only allows movement of the slide-out component in a horizontal direction.

Abstract: An improved, space-saving, vehicle slide-out is slidably supported on a vehicle chassis by a bearing mechanism and is selectively positionable relative to the chassis between retracted and extended positions. The slide-out includes, among other things, sidewalls and a cover assembly operable to cover the corresponding sidewall and the bearing mechanism while using a minimal amount of internal vehicle space. Each cover assembly includes a base segment that at least partly receives the sidewall, with the base segment and sidewall cooperatively defining a gap. The cover assembly further includes a shiftable cover segment that is operable to cover the gap.

Abstract: An air guiding system for a vehicle, particularly for a passenger car, is arranged in a rear area of the vehicle and has at least one central main air guiding element that can be displaced from a moved-in inoperative position into a moved-out operative position. Lateral auxiliary air guiding elements are displaceable together with each central main air guiding element. The lateral auxiliary air guiding elements can be rotated with respect to each central main air guiding element about a respective pivot fixed to the main air guiding element in order to change them from an also moved-in inoperative position into an also moved-out operative position.

Abstract: An assembly adapted to protect a vehicle with an expandable room by preventing water and debris on the roof of an expanded expandable room from being trapped or crushed between the expandable room and the body of the vehicle as the room is retracted. The assembly comprises an upper member and a lower member that mate at a pivoting connection. The upper member is attached to the outside surface of the vehicle above the expandable room. The lower member is pivotally combined with the upper member so that it hangs below the upper member and rests against the top edge of the expandable room. As the room is retracted, a spring urges a portion of the lower member to remain frictionally engaged with the roof of the expandable room so as to slide over the surface of the roof and remove water and other debris from the roof.

Abstract: An air guiding system for a vehicle, particularly for a passenger car, is arranged in a rear area of the vehicle and has at least one central main air guiding element that can be displaced between a moved-in inoperative position and a moved-out operative position. Lateral auxiliary air guiding elements are displaceable together with the central main air guiding element. The auxiliary air guiding elements can be adjusted with respect to the main air guiding elements essentially linearly or translatorily in a direction transversely to the longitudinal direction of the vehicle in order to move them from an also moved-in inoperative position into an also moved-out operative position. Each auxiliary air guiding element is guided in a guiding device and is movable along the latter.

Abstract: The present invention provides a slide-out room synchronizing mechanism. In one preferred embodiment according to the present invention, the slide-out room synchronizer includes upper and lower timing belts fixed to the side of the slide-out room. Each belt is coupled to a synchronizing belt within the vehicle by a set of connecting gears. As the bottom of the slide-out room moves, the force is transferred through the gears and synchronizing belt to the top upper timing belts. In this respect, the movement of the top of the slide-out room is synchronized to the bottom, providing synchronized extension or retraction at equal or varying speeds.

Abstract: A spoiler for a motor vehicle, in particular a passenger vehicle, is mounted in the rear-end area on the vehicle and comprises a spoiler element which is movable from a resting position in which it is integrated into the shape of the rear-end area and into an extended operating position. To further improve upon the aerodynamic properties of the spoiler in particular the downward pressure on the rear axle, the spoiler element has a greater transverse extent in the extended operating position than in the retracted resting position.

Abstract: In one embodiment, the present invention provides an upper locking device for a slide-out room which ensures a substantially tight seal is created at the upper portion of the slide-out room.

Abstract: A deck for use with a vehicle having a frame includes a platform. The platform has opposite upper and lower surfaces. The platform is operatively coupled to the frame of the vehicle for selective movement between a storage position, wherein the upper surface is disposed substantially underneath the vehicle and a use position wherein the upper surface is disposed alongside the vehicle for ingress and egress thereon. A stabilizer extends from the lower surface for supporting the platform above the ground while in the use position. The stabilizer is selectively height adjustable to maintain the upper surface in a generally horizontal position.

Abstract: An adjustable width trailer including a center frame with a center deck, and attached tongue and an attached guide beam that is transverse to the direction of forward movement. Left and right wheel support assemblies are slidably mounted on the guide beam. Left and right tire and wheel assemblies are attached to the wheel support assemblies by suspension assemblies. A left wing frame and a right wing frame, with wing decks are pivotally attached to the center frame, when the wheel support assemblies are in inboard positions, the wing frames are folded. When the wheel support assemblies are slid on the guide beam to outboard positions, the left and right wheels are outboard from the sides of the center frame and the left and right wing frames sit on the adjacent wheel support assemblies and are held in horizontal positions.

Abstract: A recreational vehicle having a slide-out housing, wherein the slide-out housing may be positioned in either a retracted or deployed configuration. In the deployed configuration, the slide-out housing extends outwardly from a main housing of the recreational vehicle so as to enlarge the living space within the main housing. In the retracted configuration, the slide-out housing extends inwardly into the main housing so as to reduce the living space within the main housing. In various embodiments, the slide-out housing is lifted prior to retraction and lowered after deployment so that the floor of the slide-out housing aligns with the floor of the main housing. In other various embodiments, vertical movement of the slide-out housing may occur during retraction and deployment. Moreover, the recreational vehicle may utilize a vertical actuating assembly, as disclosed herein, that is adapted to engage with the slide-out housing to thereby lift and lower the slide-out housing.

Abstract: A resilient seal is mountable around the edge of an opening in a sidewall of a mobile living quarters through which a slide-out room travels. The seal includes two parts that slide together—a mounting portion and a-bulb seal portion—with the bulb seal portion being compressed when the slide-out room is closed. A wiper seal portion extending from the mounting portion is for contacting the adjacent wall of the slide-out room.

Abstract: A stationary building structure having a sidewall opening with a shuttle section movable through the opening to an extended position or movable over the opening for closing thereof. The shuttle section includes a frame which defines a shuttle floor surface thereabove. A shuttle tail extends from the shuttle frame into the stationary building structure for supporting the shuttle section at all times whether in the extended position, the retracted position or moving therebetween. An outer shuttle wall extends upwardly from the frame for closing the sidewall opening of the stationary building when the shuttle is retracted. A sealing means is defined on the outer wall for engaging the building around the sidewall opening for selectively sealing thereof when in the retracted position. A drive mechanism is mounted to the stationary building structure and is operatively secured to the shuttle section for urging movement thereof between the respective positions.

Abstract: An expandable trailer is designed for transportation and use of satellite communication related electronic equipment. The trailer has a generally horizontal support frame with an upper surface defining a floor of the trailer. A pair of spaced apart generally vertical side walls extend upwardly from the support frame and define an interior transport area between the walls. An expansion module is supported in an opening in one of the side walls. The expansion module has a vertical front panel and rear panel with inboard edges and outboard edges. The panels are spaced apart to define the front and rear of the expansion module. A generally vertical side panel extends between the outboard edges of the front and rear panels and has an upper edge and a lower edge.

Abstract: A push-pull drive chain mechanism and scissors linkage assembly powered by a hydraulic cylinder to affect the coordinated, linear movement of an expandable room in a recreational vehicle. The drive chain moves generally vertically along a first structural member, such as a vehicle frame member, as the hydraulic cylinder extends or retracts to move the expandable room relative to the vehicle frame. The drive chain is pivotally connected at the proper place on the scissors-type linkage assembly, the links that form the scissors extending and crossing for pivotal attachment to a structural member of the vehicle body and a structural member of the expandable room. The drive chain is constructed and guided to provide the required force for opening and closing the scissors assembly.

Abstract: The slide-out mechanisms described herein are generally composed of two components. More specifically, the slide-out mechanism includes at least one elongated member, also referred to as a ram, which is coupled to the floor of a movable room. This elongated member moves with the extendable portion of a movable room. Additionally, the slide-out mechanism includes a base that is coupled to the coach floor and contains a motive device for extending and retracting the movable room accessible from the inside of the slide-out room. According to various embodiments disclosed herein, the motive device may be a hydraulic, pneumatic, or electrical motor. Alternatively, the motive force may be a crank that may be manually actuated to extend and retract the slideout room.

Abstract: A recreational vehicle includes a main living area and a slide out room that slides between an extended and retracted position relative to the main living area. At least one extendable support member is mounted within the floor of the main living area, and is connected to the slide out room so that the weight of the slide out room is transferred to the extendable support member as the room slides to the extended position. The extendable support member bends in response to the weight transfer such that the room floor is substantially flush and level with respect to the main living area floor. The extendable support includes an inner support connected to the room and the outer support connected to the vehicle. The shape of the inner support may be such that the end connected to the room drops vertically as the inner support is extended from the outer support.

Abstract: An operating mechanism for use in a vehicle having a bedroom slide out, the bedroom slide out having a platform which is movable laterally relative to a vehicle having a stationary floor. The operating mechanism laterally moves the movable room section relative to the stationary room section between a retracted position and an extended position, and has a height adjustable frame. The frame includes overlapping side members which are slidably moveable relative to each other and fastenable at two or more discrete heights.

Abstract: A linkage mechanism provides for the extension and retraction of rooms in recreational vehicles while maximizing the space inside the vehicle. Braced parallel linkage members are applied between a vehicle frame member and an expandable room member. A hydraulic cylinder or other force assist element may be used to drive a slotted glide arm which, in turn, causes the braced parallelogram linkage to shift, thus pulling or pushing the room frame member relative to the vehicle.

Abstract: A variety of vehicles are known and used which have a room or a room portion that may be moved from a retracted position while the vehicle is moving over the road and then expanded when the vehicle is stationary in order to provide additional internal space. Internal space is highly desirable in recreational vehicles, and the prior art has not allowed for maximization of this space since devices for extending and retracting the rooms take up internal space or space under the floor of the vehicle. This device provides for the extension and retraction of rooms in recreational vehicles while maximizing the space inside the vehicle. Braced parallel linkage members are applied between a vehicle frame member and an expandable room member. A hydraulic cylinder or other force assist element may be used to drive a slotted glide arm which, in turn, causes the braced parallelogram linkage to shift, thus pulling or pushing the room frame member relative to the vehicle.