An apparatus comprising a pair of telescoping arms pivotally coupled between a base and a platform. Each arm comprises a base portion pivotally coupled to the base to pivot about a base pivot axis, an extension portion slidably coupled to the base portion and pivotally coupled to the platform to piv
An apparatus comprising a pair of telescoping arms pivotally coupled between a base and a platform. Each arm comprises a base portion pivotally coupled to the base to pivot about a base pivot axis, an extension portion slidably coupled to the base portion and pivotally coupled to the platform to pivot about a platform pivot axis, and, a pivot support assembly attached along a side of one arm of the pair facing toward the other arm of the pair. The pivot support assembly is configured to allow longitudinal travel of a pivot anchor with respect to the base portion. The pivot assembly is coupled between the pivot anchors. The drive assembly is connected to controllably move the extension portions inwardly and outwardly with respect to the corresponding base portions, and controllably move the pivot anchors toward and away from the corresponding base pivot axes.
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1. An apparatus comprising: a pair of telescoping arms pivotally coupled between a base and a platform, each arm comprising:a base portion pivotally coupled to the base to pivot about a base pivot axis; an extension portion slidably coupled to the base portion and pivotally coupled to the platform t
1. An apparatus comprising: a pair of telescoping arms pivotally coupled between a base and a platform, each arm comprising:a base portion pivotally coupled to the base to pivot about a base pivot axis; an extension portion slidably coupled to the base portion and pivotally coupled to the platform to pivot about a platform pivot axis; and,a pivot support assembly attached along a side of one arm of the pair facing toward the other arm of the pair, the pivot support assembly configured to allow longitudinal travel of a pivot anchor with respect to the base portion;a pivot assembly coupled between the pivot anchors; and,a drive assembly connected to controllably move the extension portions inwardly and outwardly with respect to the corresponding base portions, and controllably move the pivot anchors toward and away from the corresponding base pivot axes. 2. The apparatus according to claim 1 wherein the drive assembly is connected to move the extension portions inwardly and outwardly with respect to the base portions at a first speed, and move the pivot anchors toward and away from the base pivot axes at a second speed which is one half of the first speed. 3. The apparatus according to claim 1 wherein the drive assembly comprises, for each arm, an extension leadscrew extending through the base portion and an extension nut coupled to the extension portion, wherein the extension leadscrew is threadedly received in the extension nut such that rotation of the extension leadscrew in a first direction causes the extension portion to move outwardly with respect to the base portion and rotation of the extension leadscrew in an opposite direction causes the extension portion to move inwardly with respect to the base portion. 4. The apparatus according to claim 3 wherein, for each arm, the pivot support assembly comprises a pivot drive casing and wherein the drive assembly comprises a pivot leadscrew extending through the pivot drive casing and a pivot anchor nut coupled to the pivot assembly, wherein the pivot leadscrew is threadedly received in the pivot anchor nut such that rotation of the pivot leadscrew in a first direction causes the pivot anchor nut to move away from the base pivot axis and rotation of the pivot leadscrew in an opposite direction causes the pivot anchor nut to move toward the base pivot axis. 5. The apparatus according to claim 4 wherein the extension leadscrew has an extension bevel gear attached to a lower end thereof and the pivot leadscrew has and a pivot bevel gear attached to a lower end thereof. 6. The apparatus according to claim 5 wherein the drive assembly comprises, for each arm, a first driving bevel gear configured to engage the extension bevel gear and a second driving bevel gear configured to engage the pivot bevel gear, wherein the first and second bevel gears are attached to a common shaft. 7. The apparatus according to claim 5 wherein the drive assembly comprises, for each arm, a first driving bevel gear configured to engage the extension bevel gear and a second driving bevel gear configured to engage the pivot bevel gear, wherein the first and second bevel gears are respectively attached to first and second shafts. 8. The apparatus according to claim 7 wherein the first and second shafts are concentric, wherein one of the first and second shafts has a central cavity and the other of the first and second shafts is rotatable within the central cavity. 9. The apparatus according to claim 1 wherein the extension portion of each arm comprises a first extension portion slidably coupled to the base portion and a second extension portion slidably coupled to the first extension portion and pivotally coupled to the platform. 10. The apparatus according to claim 9 wherein, for each arm, the pivot support assembly comprises a pivot support arm attached to the first extension portion, wherein the pivot support arm has a linear bearing thereon configured to ride along an exterior of the base portion. 11. The apparatus according to claim 9 wherein the drive assembly comprises, for each arm: a first extension leadscrew extending through the base portion and threadedly received in a first extension nut coupled to the first extension portion, the first extension leadscrew having a plurality of longitidinal slots through helical threads thereof;a first gear pivotally mounted to a bottom of the first extension portion configured to be engaged by the longitudinal slots of the first extension leadscrew;a second extension leadscrew mounted on a second gear configured to engage the first gear, the second extension leadscrew extending through the first extension portion and threadedly received in a second extension nut coupled to the second extension portion. 12. The apparatus according to claim 9 wherein the drive assembly comprises, for each arm: a first extension leadscrew extending through the base portion and threadedly received in a first extension nut coupled to the first extension portion, the first extension leadscrew having at least one longitudinal keyway therein;a first extension gear having an aperture defined therein to match a cross-sectional profile of the first extension leadscrew slidably mounted on the first extension leadscrew, the first extension gear configured to rotate with the first extension leadscrew;a second extension leadscrew mounted on a second gear pivotally mounted to a bottom of the first extension portion, the second gear configured to engage the first extension gear, the second extension leadscrew extending through the first extension portion and threadedly received in a second extension nut coupled to the second extension portion. 13. The apparatus according to claim 1 wherein the pivot support assembly for each arm comprises a pivot base portion and a pivot extension portion longitudinally moveable with respect to the pivot base portion, wherein the drive assembly comprises a cylinder in each of the base portions and the pivot base portions and an associated piston received therein on each of the corresponding extension portions and pivot extension portions. 14. The apparatus according to claim 1 wherein the pivot support assembly for each arm comprises a pivot base portion and a pivot extension portion longitudinally moveable with respect to the pivot base portion, wherein the drive assembly comprises a coil in each of the base portions and the pivot base portions and an associated armature received therein on each of the corresponding extension portions and pivot extension portions. 15. The lift comprising: a base;a platform;two pairs of telescoping arms pivotally coupled between the base and the platform, each arm of each pair comprising:a base portion pivotally coupled to the base to pivot about a base pivot axis;an extension portion slidably coupled to the base portion and pivotally coupled to the platform to pivot about a platform pivot axis; and,a pivot support assembly attached along a side of one arm of the pair facing toward the other arm of the pair, the pivot support assembly configured to allow longitudinal travel of a pivot anchor with respect to the base portion;two pivot assemblies, each pivot assembly coupled between the pivot anchors of one of the pairs of telescoping arms; anda drive assembly connected to controllably move the extension portions inwardly and outwardly with respect to the corresponding base portions, and controllably move the pivot anchors toward and away from the corresponding base pivot axes. 16. The lift according to claim 15 wherein the arms are configured to be at an angle of at least about 10 degrees with respect to the base when the platform is in a lowered position. 17. The lift according to claim 15 comprising one or more biasing mechanisms configured to urge the arms upwardly when the arms are at an angle of less than about 10 degrees with respect to the base. 18. The lift according to claim 15 comprising one or more primary lifting mechanisms coupled between the base and the platform, the primary lifting mechanisms configured to selectively provide upward vertical force for raising the platform. 19. The lift according to claim 18 wherein the primary lifting mechanisms each comprise a coiled flexible flat spring which expands with insertion of a vertically oriented spiral band. 20. The lift according to claim 15 wherein each pair of arms comprises an inner arm and an outer arm, comprising a truss structure connected between the inner arms. 21. The lift according to claim 15 wherein the drive assembly is connected to move the extension portions inwardly and outwardly with respect to the base portions at a first speed, and move the pivot anchors toward and away from the base pivot axes at a second speed which is one half of the first speed. 22. The lift according to claim 15 wherein the drive assembly comprises, for each arm, an extension leadscrew extending through the base portion and an extension nut coupled to the extension portion, wherein the extension leadscrew is threadedly received in the extension nut such that rotation of the extension leadscrew in a first direction causes the extension portion to move outwardly with respect to the base portion and rotation of the extension leadscrew in an opposite direction causes the extension portion to move inwardly with respect to the base portion. 23. The lift according to claim 22 wherein, for each arm, the pivot support assembly comprises a pivot drive casing and wherein the drive assembly comprises a pivot leadscrew extending through the pivot drive casing and a pivot anchor nut coupled to the pivot assembly, wherein the pivot leadscrew is threadedly received in the pivot anchor nut such that rotation of the pivot leadscrew in a first direction causes the pivot anchor nut to move away from the base pivot axis and rotation of the pivot leadscrew in an opposite direction causes the pivot anchor nut to move toward the base pivot axis. 24. The lift according to claim 23 wherein the extension leadscrew has an extension bevel gear attached to a lower end thereof and the pivot leadscrew has and a pivot bevel gear attached to a lower end thereof. 25. The lift according to claim 24 wherein the drive assembly comprises, for each arm, a first driving bevel gear configured to engage the extension bevel gear and a second driving bevel gear configured to engage the pivot bevel gear, wherein the first and second bevel gears are attached to a common shaft. 26. The lift according to claim 24 wherein the drive assembly comprises, for each arm, a first driving bevel gear configured to engage the extension bevel gear and a second driving bevel gear configured to engage the pivot bevel gear, wherein the first and second bevel gears are respectively attached to first and second shafts. 27. The lift according to claim 26 wherein the first and second shafts are concentric, wherein one of the first and second shafts has a central cavity and the other of the first and second shafts is rotatable within the central cavity. 28. The lift according to claim 15 wherein the extension portion of each arm comprises a first extension portion slidably coupled to the base portion and a second extension portion slidably coupled to the first extension portion and pivotally coupled to the platform. 29. The lift according to claim 28 wherein, for each arm, the pivot support assembly comprises a pivot support arm attached to the first extension portion, wherein the pivot support arm has a linear bearing thereon configured to ride along an exterior of the base portion. 30. The lift according to claim 28 wherein the drive assembly comprises, for each arm: a first extension leadscrew extending through the base portion and threadedly received in a first extension nut coupled to the first extension portion, the first extension leadscrew having a plurality of longitidinal slots through helical threads thereof;a first gear pivotally mounted to a bottom of the first extension portion configured to be engaged by the longitudinal slots of the first extension leadscrew;a second extension leadscrew mounted on a second gear configured to engage the first gear, the second extension leadscrew extending through the first extension portion and threadedly received in a second extension nut coupled to the second extension portion. 31. The lift according to claim 28 wherein the drive assembly comprises, for each arm: a first extension leadscrew extending through the base portion and threadedly received in a first extension nut coupled to the first extension portion, the first extension leadscrew having at least one longitudinal keyway therein;a first extension gear having an aperture defined therein to match a cross-sectional profile of the first extension leadscrew slidably mounted on the first extension leadscrew, the first extension gear configured to rotate with the first extension leadscrew;a second extension leadscrew mounted on a second gear pivotally mounted to a bottom of the first extension portion, the second gear configured to engage the first extension gear, the second extension leadscrew extending through the first extension portion and threadedly received in a second extension nut coupled to the second extension portion. 32. The lift according to claim 15 wherein the pivot support assembly for each arm comprises a pivot base portion and a pivot extension portion longitudinally moveable with respect to the pivot base portion, wherein the drive assembly comprises a cylinder in each of the base portions and the pivot base portions and an associated piston received therein on each of the corresponding extension portions and pivot extension portions. 33. The lift according to claim 15 wherein the pivot support assembly for each arm comprises a pivot base portion and a pivot extension portion longitudinally moveable with respect to the pivot base portion, wherein the drive assembly comprises a coil in each of the base portions and the pivot base portions and an associated armature received therein on each of the corresponding extension portions and pivot extension portions. 34. The lift according to claim 15 wherein the two pairs of telescoping arms comprise two or more stacked sets of pivotally coupled between the base and the platform.
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