Height adjustable table
First Claim
1. A spring assembly for use in a counterbalance system, the assembly comprising:
- a datum member;
a compression spring having proximal and distal ends, the proximal end of the spring supported by the datum member;
an elongated guide having proximal and distal ends and including at least a first substantially straight edge that extend between the proximal and distal ends of the guide, the proximal end of the guide supported by the datum member, the first edge extending along the length of the spring from the proximal end of the spring to the distal end of the spring wherein a space between the first edge and an adjacent portion of the spring is less than one quarter of an inch; and
a strand including first and second ends, the first end of the strand linked to the distal end of the spring and the second end of the strand extending toward and past the proximal end of the spring.
2 Assignments
0 Petitions
Accused Products
Abstract
A force adjustment assembly for use within a telescoping subassembly that includes a first elongated member and a second elongated member that is supported by the first elongated member for sliding motion along an extension axis, the subassembly further including a force equalizer assembly that includes a strand having first and second ends that are supported by the second and first elongated members, respectively, the adjustment assembly comprising a preloader supported by at least one of the first and second elongated members and supporting at least a portion of the strand, the preloader applying a preload force via the strand when the second elongated member is in a fully extended position and an adjuster for adjusting the preload force applied by the preloader.
142 Citations
105 Claims
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1. A spring assembly for use in a counterbalance system, the assembly comprising:
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a datum member;
a compression spring having proximal and distal ends, the proximal end of the spring supported by the datum member;
an elongated guide having proximal and distal ends and including at least a first substantially straight edge that extend between the proximal and distal ends of the guide, the proximal end of the guide supported by the datum member, the first edge extending along the length of the spring from the proximal end of the spring to the distal end of the spring wherein a space between the first edge and an adjacent portion of the spring is less than one quarter of an inch; and
a strand including first and second ends, the first end of the strand linked to the distal end of the spring and the second end of the strand extending toward and past the proximal end of the spring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A spring assembly for use in a counterbalance system, the assembly comprising:
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a datum member that forms an opening;
a compression spring having proximal and distal ends and including an internal surface that forms a spring passageway along the length of the spring, the proximal end of the spring supported by the datum member with the opening in the datum member at least partially aligned with the spring passageway;
a guide including at least a first elongated guide member and a first separator member, the elongated guide member supported at a proximal end by the datum member and extending from the proximal end to the distal end within the spring passageway, the first separator member covering a portion of the guide member and separating the portion of the guide member from the spring; and
a strand including first and second strand ends, the first end linked to the distal end of the spring, the second end extending through the spring passageway and the opening in the datum member;
wherein the guide member and the separator member are formed of first and second materials and the second material is a lower friction material than the first material. - View Dependent Claims (26, 27)
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28. A spring assembly for use in a counterbalance system, the assembly comprising:
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a datum member that forms an opening;
a compression spring having proximal and distal ends and including an internal surface that forms a spring passageway along the length of the spring, the proximal end of the spring supported by the datum member with the opening in the datum member at least partially aligned with the spring passageway;
a guide supported at a proximal end by the datum member and extending from the proximal end to the distal end within the spring passageway, the guide including first and second guide members that are substantially parallel to each other and that are separated by a space to form a channel therebetween, the first guide member forming first and third extension members that extend generally away from the second guide member and first and second rails that extend generally toward the second guide member, the second guide member forming second and fourth extension members that extend generally away from the first guide member and third and fourth rails that extend generally toward the first guide member;
a plunger supported by the rails for movement there along, the plunger having first and second ends, the first end linked to the distal end of the spring;
separator members secured to at least portions of the first, second, third and fourth extension members and that form external surfaces, at least portions of the external surfaces proximate the internal surface of the spring, the separator members also including members positioned between the plunger and the rails to separate the plunger from the rails; and
a strand including first and second ends, the first end linked to the plunger and the second end extending through the spring passageway and the opening formed by the datum member.
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29. An extendable leg apparatus comprising:
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a first column having a length dimension parallel to a substantially vertical extension axis;
a second column supported by the first column for sliding motion along the extension axis between at least an extended position and a retracted position;
at least one of the first and second columns forming an internal cavity; and
a counterbalance assembly including;
a spring guide supported substantially within the cavity;
a compression spring having first and second ends and forming a spring passageway, the spring positioned such that the spring guide resides at least in part in the spring passageway and with a first end supported within the cavity; and
an equalizer assembly including a first end linked to the second end of the spring and a second end linked to the first column, the force equalizer assembly and spring applying a force between the first and second columns tending to drive the columns into the extended position wherein the applied force is substantially constant irrespective of the position of the second column with respect to the first column. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A telescoping assembly, the assembly comprising:
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a first elongated member including an internal surface that forms a first passageway extending along an extension axis;
a second elongated member including an external surface, the second member received within the first passageway for sliding movement along the extension axis;
a first of the internal and external surfaces forming a first mounting surface pair including first and second co-planar and substantially flat mounting surfaces;
a second of the internal and external surfaces forming a first raceway along at least a portion of the first surface length, the first raceway having first and second facing raceway surfaces adjacent the mounting surface pair; and
at least a first roller pair including first and second rollers mounted to the first and second mounting surfaces for rotation about first and second substantially parallel roller axis, respectively, the first and second roller axis spaced apart along the extension axis, the first roller axis closer to the first raceway surface than to the second raceway surface and the second roller axis closer to the second raceway surface than to the first raceway surface wherein the first and second rollers interact with the first and second raceway surfaces to facilitate sliding of the first elongated member with respect to the second elongated member along the extension axis. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. A telescoping assembly, the assembly comprising:
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a first elongated member including an internal surface that forms a first passageway extending along an extension axis;
a second elongated member including an external surface, the second member received within the first passageway for sliding movement along the extension axis;
a first of the internal and external surfaces forming first, second, third and fourth mount surfaces wherein the first and third mount surfaces form less than a 30 degree angle and are non-co-planar, the second and fourth mount surfaces form less than a 30 degree angle and are non-co-planar and the first and second mount surfaces form an angle between 60 and 120 degrees;
a second of the internal and external surfaces forming first, second, third and fourth raceways along at least a portion of the second surface length, the first, second, third and fourth raceways adjacent the first, second, third and fourth mount surfaces and including first and second spaced apart, third and fourth spaced apart, fifth and sixth spaced apart and seventh and eighth spaced apart raceway surfaces, respectively;
first, second, third and fourth bearing pairs mounted to the first, second, third and fourth mount surfaces and including first and second, third and fourth, fifth and sixth, and seventh and eighth bearings, respectively, where the bearings of each pair are spaced apart along the extension axis, the first, third, fifth and seventh bearings supported relatively closer to the first, third, fifth and seventh raceway surfaces than to the second, fourth, sixth and eighth raceway surfaces and the second, fourth, sixth and eighth bearings supported relatively closer to the second, fourth, sixth and eighth raceway surfaces than to the first, third, fifth and seventh raceway surfaces and, wherein, the first, second, third, fourth, fifth, sixth, seventh and eighth bearings interact with the first, second, third, fourth, fifth, sixth, seventh and eighth raceway surfaces, respectively, to facilitate sliding motion of the second elongated member with respect to the first elongated member. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68)
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69. A telescoping assembly, the assembly comprising:
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a first elongated member including an internal surface that forms a first passageway extending along an extension axis;
a second elongated member including an external surface, the second member received within the first passageway;
one of the internal and external surfaces forming first and third non-coplanar mount surfaces that form less than a 30 degree angle and second and fourth non-coplanar mount surfaces that form less than a 30 degree angle where the second mount surface forms an angle between substantially 60 and 120 degrees with respect to the first mount surface;
the other of the internal and external surfaces forming first, second, third and fourth raceways adjacent the first, second, third and fourth mount surfaces; and
first, second, third and fourth roller assemblies mounted to the first, second, third and fourth mount surfaces, respectively, each roller assembly including at least one roller mounted for rotation about an axis that is substantially perpendicular to the mounting surface to which the roller is mounted and that is substantially perpendicular to the extension axis, the first, second, third and fourth roller assemblies interacting with the first, second, third and fourth raceways to facilitate sliding motion of the first elongated member along the extension axis with respect to the second elongated member. - View Dependent Claims (70, 71, 72, 73)
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74. An extendable leg apparatus comprising:
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a first column having a length dimension parallel to a substantially vertical extension axis;
a second column supported by the first column for sliding motion along the extension axis;
at least one of the first and second columns forming an internal cavity;
a table top supported by one of the first and second columns; and
a counterbalance assembly including;
a spring having first and second ends;
a spiral cam pulley supported for rotation about a pulley axis, the pulley including a lateral surface spaced from the pulley axis, the lateral surface forming a helical cable channel that wraps around the pulley axis and that includes first and second channel ends so that at least a portion of the channel and the pulley axis forms channel radii perpendicular to the pulley axis, the radii increasing along at least a portion of the channel in the direction from the first channel end toward the second channel end; and
at least one strand having a central portion and first and second strand ends, the central portion received within at least a portion of the pulley channel with the first and second strand ends extending from a first radii portion and a second radii portion of the channel where the first portion has a radii that is smaller than the second portion, the first and second strand ends linked to the first column and the second end of the spring, respectively;
wherein the strand has a cross sectional diameter and the minimum radii of the channel from which the first strand end extends is at least five times the strand diameter. - View Dependent Claims (75, 76, 77, 78, 79, 80, 104)
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81. A support assembly, the assembly comprising:
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a first elongated member having a length dimension parallel to a substantially vertical extension axis and forming an internal surface;
a second elongated member supported by the first member for motion along the extension axis between at least an extended position and a retracted position, the second elongated member forming an external surface;
a spring that generates a variable spring force that depends at least in part on the degree of spring loading, the spring having first and second ends;
an equalizer assembly including a first end linked to the second end of the spring and a second end linked to the first member, the force equalizer assembly and spring applying a force between the first and second members tending to drive the elongated members into the extended position wherein the applied force is substantially constant irrespective of the position of the second elongated member with respect to the first elongated member; and
rollers positioned between the internal and external surfaces to facilitate movement of the second column along the vertical extension axis with respect to the first column wherein each roller includes an annular inner bearing race, an annular outer bearing race and bearings between the inner and outer races. - View Dependent Claims (82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 103, 105)
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101. The assembly of claim 101 wherein the first radii portion is at least 0.5 inches irrespective of the relative positions of the first and second columns.
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102. The assembly of claim 102 wherein the first radii portion is approximately 0.5 inches when the second column is in the retracted position and is approximately 2.0 inches when the second column is in the extended position.
Specification