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An illustrative patient support apparatus includes a first section adapted to support a first portion of a patient, a second section adapted to support a second portion of the patient and pivotably movable relative to the first section about a first pivot axis, a third section adapted to support a t

An illustrative patient support apparatus includes a first section adapted to support a first portion of a patient, a second section adapted to support a second portion of the patient and pivotably movable relative to the first section about a first pivot axis, a third section adapted to support a third portion of the patient and pivotably movable relative to the second section about a second pivot axis that is parallel with the first pivot axis, a first locking mechanism that, when locked, prevents the second section from pivoting relative to the first section, a first lever that is movable to unlock the first locking mechanism to allow the second section to pivot relative to the first section, a second locking mechanism that, when locked, prevents the third section from pivoting relative to the second section, and a second lever that is movable to unlock the second locking mechanism to allow the third section to pivot relative to the second section.

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An illustrative patient support apparatus includes a first section adapted to support a first portion of a patient, a second section adapted to support a second portion of the patient and pivotably movable relative to the first section about a first pivot axis, a third section adapted to support a t

An illustrative patient support apparatus includes a first section adapted to support a first portion of a patient, a second section adapted to support a second portion of the patient and pivotably movable relative to the first section about a first pivot axis, a third section adapted to support a third portion of the patient and pivotably movable relative to the second section about a second pivot axis that is parallel with the first pivot axis, a first locking mechanism that, when locked, prevents the second section from pivoting relative to the first section, a first lever that is movable to unlock the first locking mechanism to allow the second section to pivot relative to the first section, a second locking mechanism that, when locked, prevents the third section from pivoting relative to the second section, and a second lever that is movable to unlock the second locking mechanism to allow the third section to pivot relative to the second section. f each frame end permitting conversion of the couch into a bed by exposing the entire mattress therefore forming a bed suitable for sleeping. 4. A convertible couch bed comprising: a) a frame having a pair of opposed ends with each end having a horizontal upper surface and an arm, said frame further having an upper longitudinal support between the ends adjacent to the upper surface, b) a mattress support structure disposed between and attached to the ends for sustaining the structural integrity of the frame in conjunction with the upper longitudinal support, said mattress support structure further comprises a metallic frame bed spring, said metallic frame bed spring further comprises, a rectangular angle frame having a matrix of intermeshed wires between extension springs that are attached directly to the angle frame, c) a mattress positioned upon the mattress support structure forming a comfortable seat for sitting on a top portion thereof, d) an upholstered top directly above and covering a rear portion of the mattress, said top having a front edge and a rear edge with the top edge hingeably attached to the frame upper longitudinal support, e) an upholstered back having a upper edge and a lower edge with the upper edge of the back hingeably attached to the front edge of the top such that the back may fold upward in accordion fashion in concert with the top and the lower edge may rest upon the horizontal upper surface of each frame end permitting conversion of the couch into a bed by exposing the entire mattress therefore forming a bed suitable for sleeping, and f) said top rear edge attached to the frame upper longitudinal support and said upper edge of the back hingeably attached to the front edge of the top defined as, a first piano hinge attaching the top rear edge to the frame upper longitudinal support and a second piano hinge attaching the back to the front edge of the top. 5. The convertible couch bed as recited in claim 4 wherein said ends are detachable from the longitudinal support and mattress support structure for ease of transportation and storage. 6. The convertible couch bed as recited in claim 4 wherein said arms further comprise, a padded and upholstered arm rest disposed on each frame arm. 7. The convertible couch bed as recited in claim 4 wherein said mattress further includes a covering of upholstery material. 8. The convertible couch bed as recited in claim 4 wherein said mattress is of a conventional twin bed size. 9. The convertible couch bed as recited in claim 4 wherein said upholstered top is flush with the frame end horizontal upper surface. 10. The convertible couch bed as recited in claim 4 wherein said upholstered top further having open cell foam with a thickness of at least 1 inch (2.54 cm) covered by upholstery material. 11. The convertible couch bed as recited in claim 4 wherein said upholstered back further having open cell foam with a thickness of at least 2.5 inches (6.35 cm) covered by upholstery material. 12. The convertible couch bed as recited in claim 4 wherein said upholstered back is angled from 10 to 30 degrees from vertical for seating comfort. 13. A convertible couch bed comprising: a) a frame, having a pair of opposed ends with each end having a horizontal upper surface and an arm, said frame further having an upper longitudinal support between the ends adjacent to the upper surface, b) a mattress support structure disposed between and attached to the ends for sustaining the structural integrity of the frame in conjunction with the upper longitudinal support, c) a mattress positioned upon the mattress support structure forming a comfortable seat for sitting on a top portion thereof, said mattress is in two separate sections each having dimensions of a conventional twin bed size and hingeably attached together on one longitudinal side such that they are positioned one on top of the other when acting as a seat and when pivoted to a side by side flat position form ing a king size bed, d) an upholstered top directly above and covering a rear portion of the mattress said top having a front edge and a rear edge with the top rear edge hingeably attached to the frame upper longitudinal support, e) an upholstered back having a upper edge and a lower edge with the upper edge of the back hingeably attached to the front edge of the top such that the back may fold upward in accordion fashion in concert with the top and the lower edge may rest upon the horizontal upper surface of each frame end permitting conversion of the couch into a bed by exposing the entire mattress therefore forming a bed suitable for sleeping, f) said top rear edge attached to the frame upper longitudinal support and said upper edge of the back hingeably attached to the frame edge of the top defined as, a first piano hinge attaching the top rear edge to the frame upper longitudinal support and a second piano hinge attaching the back to the front edge of the top, and g) portable metallic frame bed springs stored under said mattress support structure such that the bed springs may be manually slid in front of the convertible couch bed to receive and support the mattress extending section. 14. The convertible couch bed as recited in claim 13 wherein said portable metallic frame bed springs further comprise, a) a rectangular angle frame having a matrix of intermeshed wires between extension springs that are attached directly to the angle frame, and b) a plurality of casters disposed on the angle frame for ease of movement of the frame from under the couch when extending the mattress therefrom. 15. A convertible couch bed comprising: a frame, having a pair of opposed ends and longitudinal support means for spacing the ends apart, a mattress support structure disposed between the ends and longitudinal support means, a mattress positioned upon the support structure forming a comfortable seat for sitting on a top portion thereof, said mattress having two separate sections each having dimensions of a conventional twin bed size and hingeably attached together on one longitudinal side such that they are positioned one on top of the other when acting as a seat and when pivoted to a side by side flat position forming a king size bed, and portable metallic frame bed springs stored under said mattress support structure such that they may be manually moved in front of the couch bed to receive and support the mattress extending section, a top directly above and covering a rear portion of the mattress, said top having a front edge and a rear edge with the top rear edge hingeably attached to the frame upper longitudinal support means, a back having a upper edge and a lower edge with the upper edge of the back hingeably attached to the front edge of the top such that the back may fold upward in accordion fashion in concert with the top and the lower edge may rest upon the frame permitting conversion of the couch into a bed by exposing the entire mattress therefore forming a bed suitable for sleeping, and said top rear edge hingeably attached to the frame upper longitudinal support means and said upper edge of the back hingeably attached to the front edge of the top defined as, a first piano hinge attaching the top rear edge to the frame upper longitudinal support and a second piano hinge attaching the back to the front edge of the top. nt levels of air flow between the lens and frame while maintaining the lens in front of a user's eyes, and retained at each position. One position is defined by substantially all the lens periphery contacting the frame to substantially form a seal. Other positions are defined by substantially all the lens periphery not contacting the frame wherein ambient air flows uninhibited across the inside surface of the lens. The lens-retention mechanism comprises a post and detent, while the adjustment mechanism comprises various mechanisms, for example a rack and pinion, a lever or a rack and pawl that biases the lens to one of the other positions. The adjustment and lens-retention mechanisms may be the same mechanism.