| 摘要 |
A hinge assembly is mounted on a rail supported above a floor by two legs to support one end of a sofa/bed. A like hinge assembly is mounted the same way at the other end of the sofa/bed. The hinge assemblies include side rails supporting front and rear sofa frame members. Each hinge assembly combines front and rear pivot arms supporting a seat bracket, a backrest bracket and an intermediate hinge plate. A latch arm is pivoted to the seat bracket and received through a loop fastened on the intermediate hinge plate and on which a stop is provided. The latch arm is spring biased against the stop and includes a notch receivable in the stop to latch the arm. A latch dog is provided in the arm and which can be toggled between a position enabling latching of the arm against the stop, and a position enabling release of the arm from the stop. The organization of the components enables conversion of the sofa from a forward facing backrest configuration to a bed configuration to a rearward facing backresting configuration by merely handling the front edge of the seat in various movements upward and downward and without separate pull handles, knobs, cables, and without simultaneously or separately handling the backrest along with the seat.
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