Controlled motion bed-frame positioning assembly

1. A bed frame comprising:

a first and a second set of scissor arms, wherein each set of scissor arms comprises a first arm pivotally coupled to a second arm, each of said first and second arms having a respective upper end and a respective lower end;

a generally rectangular upper frame coupled to the respective upper end of each of said first and second arms, wherein the first arm of each set of scissor arms is both pivotally and slidably connected to the upper frame and the second arm of each set of scissor arms is pivotally connected to the upper frame;

a biasing member comprising a first terminating end and a second terminating end, the biasing member coupled at the first terminating end to the upper frame and coupled at the second terminating end to the first arm of the first set of scissor arms; and

a locking pin positioned to engage one of a plurality of holes arranged in the first arm of the first set of scissor arms.

2. The bed frame of claim 1 , wherein the first and second set of scissor arms are positioned on opposed sides of the generally rectangular upper frame.

3. The bed frame of claim 1 , wherein the respective lower end of the first arm and the second arm of each set of scissor arms are operably coupled to casters.

4. The bed frame of claim 1 , wherein the respective lower end of each first and second arm is coupled to a respective caster.

5. The bed frame of claim 1 ,

wherein the bed frame further comprises a first bottom frame member coupled to the respective lower end of each first arm and a second bottom frame member coupled to the respective lower end of each second arm; and

wherein each bottom frame member has a plurality of casters coupled thereto.

6. The bed frame of claim 1 , wherein:

the first arm of each set of scissor arms is coupled to a respective locking plate fixed to the upper frame;

each respective locking plate includes a horizontal slot formed therein; and

to both pivotally and slidably couple each first arm to the respective locking plate, a respective fastener extends through both the first arm and the horizontal slot formed in the respective locking plate.

7. The bed frame of claim 6 , wherein the second terminating end of the biasing member is coupled to the respective fastener that couples the first scissor arm of the first set of scissor arms to the respective locking plate, such that actuation of the biasing member slides the respective fastener along a respective horizontal slot, thereby also moving the first arm of the first set of scissor arms.

8. The bed frame of claim 1 ,

wherein the locking pin is a spring-loaded locking pin coupled to a cable; and

wherein pulling on the cable disengages the spring loaded locking pin from the one of a plurality of holes.

9. The bed frame of claim 1 further comprising:

a second biasing member comprising a first terminating end and a second terminating end, the second biasing member coupled at its first terminating end to the upper frame and coupled at its second terminating end to the first arm of the second set of scissor arms; and

a second locking pin positioned to engage one of a plurality of holes arranged in the respective first arm of the second set of scissor arms.

10. The bed frame of claim 9 , wherein:

the first locking pin and the second locking pin are spring-loaded locking pins;

the first locking pin and the second locking pin are tethered by a cable; and

pulling on the cable disengages both the first locking pin and the second locking pin from a respective one of a plurality of holes.

11. The bed frame of claim 1 ,

wherein the upper frame comprises a plurality of cross supports;

wherein the first arm of the first set of scissor arms is both pivotably and slidably connected to a first cross support member and the second arm of the first set of scissor arms is pivotally connected to the first cross support member; and

wherein the first arm of the second set of scissor arms is both pivotably and slidably connected to a second cross support member and the second arm of the second set of scissor arms is pivotally connected to the second cross support member.

12. The bed frame of claim 11 ,

wherein the first cross support member and the second cross support member each has a respective stop coupled thereto; and

wherein each respective stop is positioned to engage a respective set of scissor arms when the upper frame is lowered towards the respective lower end of each arm.

13. The bed frame of claim 1 , wherein the biasing member is operable to raise and lower the upper frame in an evenly controlled motion.

14. The bed frame of claim 13 , wherein the biasing member includes a gas cylinder in combination with a piston.

15. A positioning assembly for raising and lowering a mattress-supporting frame of a bed frame, the positioning apparatus comprising:

a first and a second set of scissor arms, wherein:

(1) each set of scissor arms comprises a first arm pivotally coupled to a second arm, each of said first and second arms having an upper end and a lower end;

(2) the upper end of each of said first and second arms is attachable to the mattress-supporting frame; and

(3) the first scissor arm of each set of scissor arms is both pivotably and slidably connectable to the mattress-supporting frame and the second scissor arm of each set of scissor arms is pivotably connectable to the mattress-supporting frame;

a biasing member comprising a first terminating end and a second terminating end, the biasing member attachable at the first terminating end to the mattress-supporting frame and coupled at the second terminating end to the first arm of the first set of scissor arms; and

a first locking pin positioned to engage one of a plurality of holes arranged in the first arm of the first set of scissor arms.

16. The positioning assembly of claim 15 further comprising a first locking plate for pivotably and slidably connecting the first arm of the first set of scissor arms to the mattress-supporting frame and a second locking plate for pivotably and slidably connecting the first arm of the second set of scissor arms to the mattress-supporting frame, wherein:

each locking plate has a slot formed therein for receiving a respective fastener, which couples the locking plate to the respective first arm; and

the first locking plate supports the first locking pin.

17. The positioning assembly of claim 16 ,

wherein the second terminating end of the biasing member is rotatably coupled to the respective fastener of the first locking plate; and

wherein force exerted by the biasing member both slides the respective fastener of the first locking plate along the slot of the first locking plate and positions the first arm of the first set of scissor arms relative to the mattress-supporting frame.

18. The positioning assembly of claim 17 further comprising:

a second biasing member comprising a first terminating end and a second terminating end, the second biasing member attachable at the first terminating end to the mattress-supporting frame and coupled at the second terminating end to the first arm of the second set of scissor arms; and

a second locking pin secured in the second locking plate, the second locking pin for engaging one of a plurality of holes arranged in the first arm of the second set of scissor arms.

19. The positioning apparatus of claim 18 ,

wherein the first locking pin and the second locking pin are spring loaded;

wherein the first locking pin and the second locking pin are tethered by a cable; and

wherein pulling on the cable disengages both the first locking pin and the second locking pin from a respective one of a plurality of holes.

20. A bed frame comprising:

a first and a second bottom frame member comprising one or more casters;

coupled to both bottom frame members, a first and a second set of scissor arms, wherein:

(1) each set of scissor arms comprises a first arm pivotally coupled to a second arm, each arm having a lower end and an upper end; and

(2) the lower end of each arm is coupled to one of the bottom frame members;

an upper frame coupled to the upper end of each arm, the upper frame comprising a first locking plate and a second locking plate, each locking plate comprising a respective horizontal slot formed therein, wherein:

(1) the first arm of the first set of scissor arms is both pivotably and slidably connected to the first locking plate by a first fastener passing through both the first arm of the first set of scissor arms and the respective horizontal slot in the first locking plate;

(2) the first arm of the second set of scissor arms is both pivotably and slidably connected to the second locking plate by a second fastener passing through both the first arm of the second set of scissor arms and the respective horizontal slot in the second locking plate; and

(3) the second arm of each set of scissor arms is pivotally coupled to the upper frame;

a biasing member comprising a first terminating end and a second terminating end, the biasing member coupled at the first terminating end to the upper frame and coupled at the second terminating end to the first fastener, such that actuation of the biasing member slides the first fastener in an evenly controlled motion along a respective horizontal slot in the first locking plate, thereby also moving the first arm of the first set of scissor arms in an evenly controlled motion respective to the upper frame; and

a first locking pin positioned to engage one of a plurality of holes arranged in the first arm of the first set of scissor arms.