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A patient support is provided for supporting a patient. The patient support includes a bedframe and a wheel assembly. The wheel assembly includes a wheel pivotably coupled to the bedframe and a wheel position holder. The wheel position holder has a cam and a cam surface that includes recesses config

A patient support is provided for supporting a patient. The patient support includes a bedframe and a wheel assembly. The wheel assembly includes a wheel pivotably coupled to the bedframe and a wheel position holder. The wheel position holder has a cam and a cam surface that includes recesses configured to cooperate with the cam to position the wheel.

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1. A patient support comprising a bedframe, anda wheel assembly including a wheel pivotably coupled to the bedframe and a wheel position holder, the wheel position holder including a cam member and a cam surface including a sinusoidal profile configured to limit pivoting movement of the wheel. 2. Th

1. A patient support comprising a bedframe, anda wheel assembly including a wheel pivotably coupled to the bedframe and a wheel position holder, the wheel position holder including a cam member and a cam surface including a sinusoidal profile configured to limit pivoting movement of the wheel. 2. The patient support of claim 1, further including a biaser configured to bias the wheel into contact with a floor surface. 3. The patient support of claim 1, wherein the cam surface is substantially circular. 4. The patient support of claim 1, wherein the cam surface includes a pair of raised surfaces and a pair of lowered surfaces. 5. The patient support of claim 1, wherein the wheel assembly includes a vertical axis and the wheel position holder limits the pivoting moment of the wheel to four positions about the vertical axis of the wheel assembly. 6. The patient support of claim 5, wherein the four positions are spaced about ninety degrees apart. 7. The patient support of claim 1, wherein the bed frame is supported on a floor surface by a plurality of wheels. 8. The patient support of claim 1, wherein the bed frame includes first and second longitudinally spaced apart ends and the wheel assembly is coupled to the bed frame at a position between the first and second ends. 9. The patient support of claim 8, wherein the wheel assembly is coupled to the bed frame at a midpoint between the first and second longitudinally spaced apart ends. 10. The patient support of claim 1, wherein the wheel assembly includes a spring configured to bias the cam into engagement with the cam surface. 11. A patient support comprising a bedframe, anda wheel assembly including a biaser and a wheel position holder, the wheel position holder being configured to pivotally couple the wheel to the bedframe and control pivoting movement of the wheel assembly, the biaser configured to bias the wheel into contact with a floor surface, wherein the wheel position holder includes a cam and a cam surface, wherein the cam surface includes a sinusoidal profile. 12. A caster for a bed including a frame, the caster comprising a wheel configured to contact a floor, anda position holder configured to control the position of the wheel relative to the frame, the position holder being coupled to the wheel and adapted to be coupled to the frame, the position holder including a cam member and a cam surface, the cam surface including two pairs of recesses configured to cooperate with the cam member to position the wheel. 13. The caster of claim 12, wherein the two pairs of recesses each have a depth, the depth of one of the two pairs deeper than the other pair of recesses. 14. The caster of claim 12, wherein the two pairs of recesses are positioned about ninety degrees apart on the cam surface. 15. The caster of claim 12, wherein the recesses are separated by four peaks, the peaks including a smooth contour. 16. A patient support comprising a bedframe, anda wheel assembly coupled to the bedframe and including a wheel and means for positioning the wheel in one of a first direction of rotation and a second direction of rotation relative to the frame, the first and second directions of the wheel separated by an angle of rotation of less than one hundred eighty degrees, wherein the means for positioning the wheel includes a cam member that rolls upon at least one peak and at least one valley of a cam surface as the wheel pivots about a substantially vertical axis relative to the frame. 17. The patient support of claim 16, wherein the angle of rotation is about ninety degrees. 18. The patient support of claim 16, wherein the bedframe includes a longitudinal axis and the first direction of rotation of the wheel positions the wheel parallel to the longitudinal axis of the bedframe. 19. The patient support of claim 16, wherein the bedframe includes a longitudinal axis and the second direction of rotation of the wheel positions the wheel perpendicular to the longitudinal axis of the bedframe. 20. The patient support of claim 16, further comprising a biasing means to bias the wheel into contact with a floor surface.