Retractable sofa bed with hidden mattress platform and guide stop with improved security

1. A sofa bed comprising:

a seat back assembly;

a seat attached to the seat back assembly;

a side frame assembly attached to the seat back assembly and the seat, the side frame assembly comprising,

a side frame;

a link assembly connected to the side frame, wherein the link assembly attaches the side frame to the seatback assembly and the seat, and the link assembly moves between a first position and a second position to allow for conversion of the sofa bed between a sofa position and a bed position; and

a lock and release member directly locking the link assembly in place;

the side frame comprises a guide;

the link assembly comprises a bearing connection connecting the link assembly to the guide,

the bearing connection slides along the guide to which the link assembly is connected when the link assembly moves between the first position and the second position, and

the lock and release mechanism is attached to the side frame adjacent to the guide, such that the lock and release mechanism receives the bearing connection and locks the bearing connection in place when the link assembly is in the first position;

a tee shaped member having a lock arm a pivot arm and a cable attachment base;

said lock arm which is sized and shaped to receive the bearing connection, the lock arm receiving the bearing connection and locking the bearing connection in place when the link assembly is moved to the first position;

a spring biasing the lock and release mechanism to a locked position; and

said cable attachment base having a release cable is attached, wherein pulling the release cable pulls the cable attachment base extending the spring and moving the lock and release mechanism around a pivot on said pivot arm from the closed position to an open position.

2. The sofa bed of claim 1 , wherein the release arm comprises a contact surface and a lock groove, wherein the contact surface is angled towards the lock groove such that the lock and release mechanism is forced open upon application of sufficient force to the contact surface.

3. A sofa bed comprising:

a seat back assembly;

a seat attached to the seat back assembly;

a side frame assembly attached to the seat back assembly and the seat, the side frame assembly comprising,

a side frame;

a link assembly connected to the side frame, wherein the link assembly attaches the side frame to the seatback assembly and the seat, and the link assembly moves between a first position and a second position to allow for conversion of the sofa bed between a sofa position and a bed position; and

a lock and release member directly locking the link assembly in place;

the link assembly comprises:

a seat link member connected to the side frame;

a crank member connected to the side frame and pivotally connected to the seat link member; and

the lock and release mechanism comprises:

a lever locking mechanism attached to the crank member, the lever locking mechanism comprising a mating projection, wherein the mating projection mates with a notch formed in the seat link member directly locking the link assembly in the first position.

4. A sofa bed comprising:

a seat back assembly;

a seat attached to the seat back assembly;

a side frame assembly attached to the seat back assembly and the seat, the side frame assembly comprising,

a side frame;

a link assembly connected to the side frame, wherein the link assembly attaches the side frame to the seatback assembly and the seat, and the link assembly moves between a first position and a second position to allow for conversion of the sofa bed between a sofa position and a bed position; and

a lock and release member directly locking the link assembly in place;

a seat link member attached to the seat, the seat link member comprising a seat bearing connection connecting the seat link member to the side frame; and

a crank member attached to the seat back assembly, the crank member comprising a main pivot, an arm, and a leg, wherein the leg is pivotally attached to the seat link member, and the arm includes a seat back bearing connection connecting the crank member to the side frame,

wherein the side frame comprises:

a pivot slot to which the main pivot is pivotally connected and around which the seatback frame rotates;

a diagonal guide formed in the side frame, wherein the seat bearing connection is slidably connected to the diagonal guide; and

an arcuate guide formed in the side frame to the rear of the diagonal guide, wherein the seat back bearing connection is slidably connected to the arcuate guide, and

wherein travel of crank member is directionally controlled by the side frame diagonal and arcuate guides, angularly controlled by said interconnected seat link member and crank member operating within said link assembly and the relative positions of seatback assembly and seat frame and the forces relating to movement by are additionally controlled by a gas spring, said gas spring reacting to and exerting forces throughout the range of motion.

5. The sofa bed of claim 4 , wherein the arcuate guide includes a lower end and an upper end, and the seat back bearing connection slides between the lower end and the upper end, and

the lock and release mechanism is attached to the side frame at a position adjacent to the lower end.

6. The sofa bed of claim 5 , wherein the lock and release mechanism comprises:

a tee shaped member having a lock arm a pivot arm and a cable attachment base;

said lock arm which is sized and shaped to receive the seat back bearing connection, the lock arm receiving the seat back bearing connection and locking the seat back bearing connection in place when the link assembly is moved to the first position;

a spring biasing the lock and release mechanism to a locked position; and

said cable attachment base having a release cable is attached, wherein pulling the release cable pulls the cable attachment base extending the spring and moving the lock and release mechanism around a pivot on said pivot arm from the closed position to an open position.

7. The sofa bed of claim 4 , further comprising:

a limiter which provides resistance when converting from the sofa position to the bed position and/or from the bed position to the sofa position, the limiter comprising a first end connected to the crank member and a second end connected to the side frame, said limiter acting through the full range of motion during said conversion,

wherein the side frame includes a limiter hole, and the limiter extends from the first end connected to the crank member through the limiter hole and to the second end connected to the side frame.

8. The sofa bed of claim 7 , wherein the limiter is a gas spring.

9. The sofa bed of claim 7 , wherein the side frame includes a raised member which projects away from the side frame, and the second end of the limiter is connected to the raised member.

10. The sofa bed of claim 4 , wherein the lock and release mechanism comprises:

a lever locking mechanism attached to the crank member, the lever locking mechanism comprising a mating projection, wherein the mating projection mates with a notch formed in the seat link member so as to lock the link assembly in the first position.

11. The sofa bed of claim 10 , wherein:

a first end of the seat link member is connected to the side frame by way of the first bearing connection, and a second end of the seat link member opposite to the first end includes the notch;

the lever is attached to a first surface of the crank member, and the mating projection projects through a hole formed in the crank member and away from a second surface of the crank member that is opposite to the first surface; and

the lock and release mechanism further comprises a spring biasing the lock and release mechanism to the closed position; and

moving the lever in a predetermined direction moves the mating projection away from the notch so as to allow the sofa bed to be moved between the sofa position and the bed position.

12. The sofa bed of claim 11 , wherein the seat link member includes an angled contact surface angled inward from the notch to a top edge of the seat link member such that the lock and release mechanism is forced open upon application of sufficient force to the contact surface.