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US 4,048,680 AGranted
Sofa bed and linkage mechanism
AssigneeRoyal Development Company, Inc.
InventorWalter Clark Rogers, Jr.
Life of this patent
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AssigneeRoyal Development Company, Inc.
InventorWalter Clark Rogers, Jr.
Estimating the term…
A sofa bed including a seat and back pivotally connected to each other and mounted to a stationary base by means of a five-bar linkage located at opposite sides of the sofa bed. In the "bed position," the five-bar linkage is in an open or expanded state with the seat and back extending in coplanar relationship in horizontal plane parallel to and above the base. In the "sofa position," the five-bar linkage is closed or collapsed and the seat extends in a horizontal plane and the back extends in an upright inclined position. To actuate the sofa bed between said positions, the seat is grasped at a forward edge portion and slightly raised which activates a second linkage, namely a four-bar linkage, which actuates and controls the five-bar linkage while permitting it to either open or close depending upon the position of the sofa bed to be achieved. The four-bar linkage includes a link in the form of a crank pivotally connected at one end to the seat and a second link having one end pivotally connected to the opposite end of the crank and an intermediate portion pivotally connected to an intermediate portion of one of the links of the five-bar linkage which also forms one of the links of the four-bar linkage. Stop means are provided for limiting and defining both positions of the sofa bed.
A sofa bed comprising in combination a base, a seat, and a back, first linkage means interconnecting the back and seat mounting them relative to the base for movement relative to each other between a sofa position wherein the seat extends generally in a horizontal plane and the back extends generally in upright position from the rear of the seat, and a bed position wherein the back and seat extend in coplanar horizontal relationship, and second linkage means including a link fixed to the seat to be movable therewith for actuating the first linkage means to move the sofa bed between said sofa and bed positions upon initial raising of a forward portion of the seat, and wherein said first linkage means includes a seat link fixed to the seat to be movable therewith, a back link fixed to the back to be movable therewith, a seat mounting link having an upper end portion pivotally connected to the seat link and a lower end portion pivotally mounted to the base, a back mounting link having an upper end portion pivotally connected to the back link and a lower end portion pivotally mounted to the base, and wherein said second linkage means includes a control linkage having one end portion pivoted to said seat link and another end portion pivoted to said seat mounting link whereby the seat link must be raised relative to the base to actuate the control linkage to permit the sofa bed to be moved to either the sofa or bed position.
A linkage system for a sofa bed of the type including a fixed base, a seat and back movable relative to each other as well as the base;
Dependencies are inferred from the claim text.