STRAIGHT MOTION PARALLELOGRAM LINKAGE

摘要

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.