Adjustable bed

1. An adjustable bed for use on a floor, said bed comprising:

a bed spring having a head end portion and a foot end portion;

a first bed end including a height adjustment mechanism that is operable to support said head end portion of said bed spring at a plurality of different heights above a floor, said height adjustment mechanism of said first bed end including a lead screw and a slip nut threadedly engaged with the lead screw;

a second bed end replaceable by said first bed end and including a height adjustment mechanism that is operable to support said foot end portion of said bed spring at a plurality of different heights above a floor, said height adjustment mechanism of said second bed end including a lead screw and a slip nut threadedly engaged with the lead screw; and

an electric motor mounted on said bed spring at a location between said first bed end and said second bed end and connected with said height adjustment mechanisms of said first and second bed ends;

a first drive shaft portion connected between said motor and said first bed end; and

a second drive shaft portion connected between said motor and said second bed end;

said first and second drive shaft portions being rotatable together by said electric motor in a first direction of rotation to raise said head end portion and said foot end portion of said bed spring and in a second direction of rotation opposite said first direction of rotation to lower said head end portion and said foot end portion of said bed spring.

2. A bed as set forth in claim 1 wherein said height adjustment mechanism of said first bed end comprises a gearbox having two different input conditions for receiving rotational force in the first direction of rotation from one of said first and second drive shaft portions and for in response either raising or lowering said head end portion of said bed spring, said gearbox having first and second input shafts for selectively receiving the rotational force and for in response either raising or lowering said head end portion of said bed spring.

3. A bed as set forth in claim 2 wherein said gearbox of said first bed end includes an output gear for driving said lead screw of said height adjustment mechanism, said output gear being in meshing engagement with one of said first and second input shafts for transmitting rotational force to said lead screw in a first direction when said rotational force is applied to said first input shaft and in a second direction when said rotational force is applied to said second input shaft.

4. A bed as set forth in claim 1 wherein said first bed end includes at least one leg engageable with the floor for supporting said first bed end on the floor, and said slip nut is rigidly coupled with said at least one leg for transmitting force from said lead screw through said slip nut to said at least one leg.

5. A bed as set forth in claim 1 wherein said first bed end includes at least one leg engageable with the floor for supporting said first bed end on the floor, and said slip nut is flexibly coupled with said at least one leg for transmitting force from said lead screw through said slip nut to said at least one leg.

6. A bed as set forth in claim 5 wherein said height adjustment mechanism includes a cable and pulley system for adjusting the height of said head end portion of said bed spring in response to rotation of said lead screw.

7. A bed as set forth in claim 1 wherein said slip nut of said first bed end is formed in two pieces each extending about 180 degrees around said lead screw of said first bed end.

8. A bed as set forth in claim 1 further including a manual crank for actuating said height adjustment mechanism of said first bed end and of said second bed end, said manual crank being removably attached to one of said first and second bed ends, said manual crank including a securing mechanism for releasably securing said manual crank to said first bed end.

9. A bed as set forth in claim 1 wherein said first bed end further includes a hollow cover for enclosing and covering said height adjustment mechanism, said cover including an interior major side panel and an exterior major side panel each of which is made from a single piece of a washable plastic material.

10. A bed end for an adjustable height bed having a driveshaft that is rotatable in first and second opposite directions of rotation about a first axis to raise and lower said bed, said bed end comprising:

a movable portion for supporting a portion of a bed spring;

an output shaft rotatable about a second axis transverse to said first axis; and

a gearbox connected with said output shaft for transmitting rotational force from the driveshaft to the output shaft;

wherein said gearbox can be coupled with the driveshaft in a first condition receiving rotational force from the driveshaft in a first direction of rotation about said first axis and effecting rotation of said output shaft about said second axis in a direction so as to raise said movable portion of said bed end;

wherein said gearbox can be coupled with said driveshaft in a second condition receiving rotational force from the driveshaft in said first direction of rotation about said first axis and effecting rotation of said output shaft about said second axis in a direction so as to lower said movable portion of said bed end;

wherein said gearbox includes first and second input shafts, said first input shaft being coupled with the driveshaft when said gearbox is in the first condition and said second input shaft being coupled with the driveshaft when said gearbox is in the first condition; and

a lead screw rotatable by said output shaft and a slip nut threadedly engaged with the lead screw operative to raise or lower said movable portion of said bed end in response to rotation of said output shaft.

11. A bed end as set forth in claim 10 wherein said lead screw rotates in a first direction when said rotational force is applied to said first input shaft and said lead screw rotates in a second direction when said rotational force is applied to said second input shaft.

12. A bed end as set forth in claim 10 including at least one leg engageable with the floor for supporting said bed end on the floor, said slip nut being rigidly coupled with said at least one leg for transmitting force from said lead screw through said slip nut to said at least one leg.

13. A bed end as set forth in claim 10 including at least one leg engageable with the floor for supporting said first bed end on the floor, said slip nut being flexibly coupled with said at least one leg for transmitting force from said lead screw through said slip nut to said at least one leg.

14. A bed end as set forth in claim 13 wherein said slip nut is flexibly coupled with said at least one leg through a cable and pulley system for adjusting the height of said movable portion of said bed spring in response to rotation of said lead screw.

15. A bed end as set forth in claim 13 wherein said slip nut is flexibly coupled with said at least one leg through a cable and pulley system for adjusting the height of said movable portion of said bed spring in response to rotation of said lead screw.

16. A bed end as set forth in claim 10 including at least one leg engageable with the floor for supporting said bed end on the floor, said slip nut being rigidly coupled with said at least one leg for transmitting force from said lead screw through said slip nut to said at least one leg.

17. A bed end as set forth in claim 10 including at least one leg engageable with the floor for supporting said first bed end on the floor, said slip nut being flexibly coupled with said at least one leg for transmitting force from said lead screw through said slip nut to said at least one leg.

18. A bed end for a bed that includes a bed spring that is adjustable vertically relative to a floor on which the bed is placed, said bed end comprising:

a movable portion for supporting the bed spring;

a fixed portion for supporting the movable portion of the bed end; and

a height adjustment mechanism operable to receive rotational force and in response to raise or lower said movable portion of said bed end relative to said fixed portion of said bed end;

said height adjustment mechanism being operable to receive rotational force in a first direction of rotation about a first axis and in response to raise said movable portion of said bed end relative to said fixed portion of said bed end, said height adjustment mechanism also being operable to receive rotational force in said first direction of rotation about said first axis and in response to lower said movable portion of said bed end relative to said fixed portion of said bed end;

wherein said height adjustment mechanism comprises a gearbox for receiving rotational force and for in response rotating a lead screw threadedly engaged with a slip nut and thereby raising or lowering said movable portion of said bed end.