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An adjustable bed is shown having an adjustable frame which supports an articulated mattress. The frame mounts a single motor which lifts a first adjustable section thereof through a threaded drive shaft. A push linkage connects from the first adjustable section of the frame back to the frame itself

An adjustable bed is shown having an adjustable frame which supports an articulated mattress. The frame mounts a single motor which lifts a first adjustable section thereof through a threaded drive shaft. A push linkage connects from the first adjustable section of the frame back to the frame itself where a conversion plate connects the push linkage to a pull linkage. The pull linkage connects to a second adjustable section of the frame. The single motor thus raises the first adjustable section and, through the linkage, the second adjustable section.

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1. In an adjustable bed having an adjustable frame that supports an articulated mattress including at least first, second and third sections adjusted by adjustment of said frame, the improvement comprising: support sections forming the sides of said frame; at least one lateral support member joi

1. In an adjustable bed having an adjustable frame that supports an articulated mattress including at least first, second and third sections adjusted by adjustment of said frame, the improvement comprising: support sections forming the sides of said frame; at least one lateral support member joining said support sections; a single motor mounted within said frame upon said lateral support member; said frame having a first adjustable section to support and adjust said first section of said articulated mattress and a second adjustable section to support and adjust said third section of said mattress, said second section thereof being mounted upon said frame; said first and second adjustable sections pivotally mounted upon said adjustable frame; mechanical drive means connecting said single motor to said first adjustable section of said frame for raising and lowering said first section; linkage means connected from said first adjustable section to said lateral support member and then to said second adjustable section for raising and lowering said second adjustable section, including: (a) a pivot converter mounted upon said lateral support member; (b) a first push linkage means attached from said first adjustable section to said pivot converter; and (c) a second pull linkage means attached from said pivot converter to said second adjustable section wherein the raising of said first adjustable section will push said first push linkage against said converter for pulling said second pull linkage against said second adjustable section for raising said second adjustable section. 2. An adjustable bed, as claimed in claim 1, wherein: said first push linkage means includes a pair of pushing arms pivotally connected from said first adjustable section to said pivot converter; and said second pull linkage means includes a single arm pivotally connecting said pivot converter to said second adjustable section. 3. An adjustable bed, as claimed in claim 2, wherein said second pull linkage means includes two linkage elements joined at each end by serrated end sections to permit the longitudinal adjustment of said linkage to assure that said articulated mattress lies flat upon said frame. 4. An adjustable bed, as claimed in claim 1, wherein said single motor and said pivot converter each pivotally mount upon connector means attached to said lateral support member. 5. An adjustable bed, as claimed in claim 1, wherein said first section of said articulated mattress is a back section, said second section thereof is a seat section, and said third section thereof is a leg section having a thigh and lower leg section and additionally comprising: a third adjustable section of said frame pivotally connected to said second adjustable section of said frame wherein adjustment of said second section by said linkage means also adjusts said third adjustable section. 6. An adjustable bed, as claimed in claim 1, wherein said adjustable frame includes: a bed frame; an adjustable power drive module nested within said bed frame; said support sections form the sides of said power drive module; and said first and second adjustable sections pivotally mounted upon the ends of said support section. 7. An adjustable bed, as claimed in claim 1, wherein said mechanical drive means connecting said sngle motor to said first adjustable section includes: a threaded shaft driven by said single motor; a threaded bushing mounted upon said shaft; and pivot means mounting said threaded bushing to said first adjustable section. 8. An adjustable bed, as claimed in claim 7, wherein said threaded bushing is formed from a moldable, low friction material to provide smooth, low friction operation of said threaded shaft and said pivot means. 9. In an adjustable bed driven by a single motor having an adjustable frame that supports an articulated mattress including at least first, second and third sections adjusted by adjustment of said frame, the improvement comprising: side support sections forming the sides of said adjustable frame; at least one lateral support member joining said side support sections; a single motor mounted upon said lateral support member; first and second adjustable sections pivotally mounted upon opposite ends of said side support sections to respectively support and adjust said first and third sections of said articulated mattress, said second mattress section mounted upon said frame; drive means connecting said single motor to said adjustable section of said frame for raising and lowering said first section; pivot means mounted upon said lateral support member; first linkage means mounted between said first adjustable section and said pivot means; and second linkage means mounted between said pivot means and said second adjustable section wherein the raising of said first adjustable section will push said first linkage against said pivot means for pulling said second linkage against said second adjustable section to raise said second adjustable section. 10. In an adjustable bed, as claimed in claim 9, wherein said drive means connecting said motor to said first adjustable means is in tension, said first linkage means is in compression, and said second linkage means is in tension during adjustment of said frame. 11. In an adjustable bed, as claimed in claim 9, wherein said first linkage means include a pair of parallelly connected links for increased strength and said second linkage includes a pair of serially connected links for adjustability.