Convertible furniture item

1. A furniture item having user-support frames that are convertible between a seat configuration and a bed configuration and that include a first support frame anchored to a furniture-item base and a middle support frame pivotably coupled to the first support frame, the furniture item comprising:

a link assembly that couples the first support frame to the furniture-item base and that includes two links positioned substantially parallel to one another;

a pin that couples the link assembly to the furniture-item base, wherein the two links are spaced apart by a roller, which provides rolling support against the furniture-item based when the link assembly pivots on the first pin;

a pivot mechanism that couples the link assembly to the first support frame, wherein the combination of the link assembly, the first pin, and the pivot mechanism facilitates both pivoting and lateral shifting of the first support frame relative to the furniture-item base;

a cam-follower block disposed under the first support frame and the middle support frame when the first support frame and the middle support frame are in the bed configuration, which is generally horizontal; and

a cam block coupled to the middle support member proximate to a junction at which the middle support frame is pivotably coupled to the first support frame,

wherein the cam block is aligned with the cam-follower block when the first support frame and the middle support frame are in the bed configuration, and

wherein the cam block includes a arcuate surface that, when the first support frame laterally shifts, contacts the cam-follower block, thereby moving the junction upwardly.

2. The furniture item of claim 1 , wherein the pivot mechanism includes a shaft that couples the two links to an attachment bracket of the first support frame.

3. The furniture item of claim 1 , wherein the pin is removable to facilitate disconnection of the first support frame from the furniture-item base.

4. The furniture item of claim 1 , wherein the cam-follower block is positioned on the furniture-item base.

5. A furniture item having user-support frames that are convertible between a seat configuration and a bed configuration, the furniture item comprising:

a furniture-item base;

a first support frame anchored to the furniture-item base by two links, which are positioned substantially parallel to one another;

a removable pin that couples the two links to one another and that pivotably couples the two links to the furniture-item base, wherein the two links are spaced apart by a roller, which provides rolling support against the furniture-item base when the two links pivot on the pin;

a pivot mechanism that couples the link assembly to an attachment bracket of the first support frame, wherein the combination of the link assembly, the first pin, and the pivot mechanism facilitates both pivoting and lateral shifting of the first support frame relative to the furniture-item base;

a middle support frame pivotably coupled to the first support frame;

a cam-follower block disposed under the first support frame and the middle support frame when the first support frame and the middle support frame are in the bed configuration, which is generally horizontal; and

a cam block coupled to the middle support member proximate to a junction at which the middle support frame is pivotably coupled to the first support frame,

wherein the cam block is aligned with the cam-follower block when the first support frame and the middle support frame are in the bed configuration, and

wherein the cam block includes a surface that, when the first support frame laterally shifts, contacts the cam-follower block, thereby moving the junction upwardly.

6. The furniture item of claim 5 , wherein the pivot mechanism includes a shaft that couples the two links to the attachment bracket of the first support frame.

7. A furniture item having user-support frames that are convertible between a seat configuration and a bed configuration and that include a first support frame anchored to a furniture-item base and a middle support frame pivotably coupled to the first support frame, the furniture item comprising:

a link assembly that couples the first support frame to the furniture-item base and that includes two links positioned substantially parallel to one another;

a pin that couples the link assembly to the furniture-item base, wherein the two links are spaced apart by a roller, which provides rolling support against the furniture-item base when the two links pivot on the pin;

a pivot mechanism that couples the link assembly to the first support frame;

a cam-follower block disposed under the first support frame and the middle support frame when the first support frame and the middle support frame are in the bed configuration; and

a cam block coupled to the middle support member proximate to a junction at which the middle support frame is pivotably coupled to the first support frame, wherein the cam block includes a surface that, when the first support frame laterally shifts, contacts the cam-follower block, thereby moving the junction upwardly.

8. The furniture item of claim 7 , wherein the combination of the link assembly, the first pin, and the pivot mechanism facilitates both pivoting and lateral shifting of the first support frame relative to the furniture-item base.

9. The furniture item of claim 7 , wherein the cam block is aligned with the cam-follower block when the first support frame and the middle support frame are in the bed configuration.

10. The furniture item of claim 7 , wherein the pivot mechanism includes a shaft that couples the two links to an attachment bracket of the first support frame.

11. The furniture item of claim 7 , wherein the pin is removable to facilitate disconnection of the first support frame from the furniture-item base.

12. The furniture item of claim 7 , wherein the cam-follower block is positioned on the furniture-item base.