Multipurpose adjustable desk-top

Claim 2

A retractable work surface system comprising: a pair of vertically-extending, laterally spaced elongate standards, each standard defining a longitudinal channel having a rear wall, a pair of spaced sidewalls extending forwardly from the rear wall, said channel having a forwardly facing restricted opening formed along its length and at the forward region thereof, the restricted opening being defined by a pair of flanges extending inwardly toward each other from the forward end of the sidewalls; means enabling each standard to be secured in an upright position without presenting any obstruction in the channel; an upper yoke slidable in each channel; a lower yoke slidable in each channel; means for releasably securing each of said yokes in any position along its respective channel; an upper link associated with each standard, the upper link being pivoted at one end to the upper yoke; a lower link associated with each standard, the lower link being pivoted at one end to the lower yoke; each of the upper links being pivoted to its associated lower link at a common pivot located forwardly of the pivotal connection between the links and their respective yokes; a table secured to the upper links for movement therewith and to connect the linkages for movement in unison with each other; said linkages being movable between a vertial position in which the upper and lower links are in longitudinal alignment with each other and in which at least portions of the upper and lower links are received within the channels in the standards.

Claim 3

A system as defined in claim 1 wherein the depth of the table is substantially equal to the combined lengths of the links in each linkage.

Claim 4

A retractable work surface system comprising: a pair of vertically-extending, laterally spaced elongate standards, each standard defining a longitudinal channel having a rear wall, a pair of spaced sidewalls extending forwardly from the rear wall, said channel having a forwardly facing restricted opening formed along its length and at the forward region thereof, the restricted opening being defined by a pair of flanges extending inwardly toward each other from the forward end of the sidewalls; means enabling each standard to be secured in an upright position without presenting any obstruction in the channel; an upper yoke slidable in each channel; a lower yoke slidable in each channel; means for releasably securing each of said yokes in any position along its respective channel; an upper link associated with each standard, the upper link being pivoted at one end to the upper yoke; a lower link associated with each standard, the lower link being pivoted at one end to the lower yoke; the forward end of each of the upper links being pivoted to the forward end of each of the lower link at a common pivot; a table secured to the upper liks for movement therewith and to connect the linkages for movement in unison with each other; said linkages being moveable between a vertical position in which the upper and lower links are in longitudinal alignment with each other and in which at least portions of the upper and lower lilnks are received within the channels in the standards; each lower yoke being formed to include an upwardly extending slot in its upper end; said end of the lower link being pivotally received in said upwardly extending slot of the lower yoke; each upper yoke being formed to define a downwardly extending slot in its lower end; said end of said upper link being pivotally received within said downwardly extending slot of said upper yoke; the means for releasably securing the yokes comprising a set screw extending through the yoke and being adapted to bear against the rear wall of each standard; the set screw associated with the upper of the yokes including a knob which protrudes forwardly of the standards to facilitate the releasability of the upper yokes and to facilitate manual raising and lowering of the yokes.

Claim 5

A retractable work surface system comprising: a pair of vertically-extending, laterally spaced elongate standards, each standard defining a longitudinal channel having a rear wall, a pair of spaced sidewalls extending forwardly from the rear wall, said channel having a forwardly facing restricted opening formed along its length and at the forward region thereof, the restricted opening being defined by a pair of flanges extending inwardly toward each other from the forward end of the sidewalls; means enabling each standard to be secured in an upright position without presenting any obstruction in the channel; an upper yoke slidable in each channel; a lower yoke slidable in each channel; means for releasably securing each of said yokes in any position along its respective channel; an upper link associated with each standard, the upper link being pivoted at one end to the upper yoke; a lower link associated with each standard, the lower link being pivoted at one end to the lower yoke; the forward end of each of the upper links being pivoted to the forward end of each of the lower link at a common pivot; a table secured to the upper liks for movement therewith and to connect the linkages for movement in unison with each other; said linkages being moveable between a vertical position in which the upper and lower links are in longitudinal alignment with each other and in which at least portions of the upper and lower lilnks are received within the channels in the standards; each lower yoke being formed to include an upwardly extending slot in its upper end; said end of the lower link being pivotally received in said upwardly extending slot of the lower yoke; each upper yoke being formed to define a downwardly extending slot in its lower end; said end of said upper link being pivotally received within said downwardly extending slot of said upper yoke; the means for releasably securing the yokes comprising a set screw extending through the yoke and being adapted to bear against the rear wall of each standard; the set screw associated with the upper of the yokes including a knob which protrudes forwardly of the standards to facilitate the releasability of the upper yokes and to facilitate manual raising and lowering of the yokes.

Claim 6

A system as defined in claim 1 further comprising: each of the upper links comprising an elongate member, angle shaped in cross section, the board being secured to one of the flanges of the angle, the other portion of the angle link being connected by said pivots to the lower link and upper yoke respectively.

Claim 7

A system as defined in claim 1 further comprising: the combined thicknesses of the upper and lower links being no greater than the width of the slot to facilitate receiving of the links in the slot.

Claim 8

A system as defined in claim 5 further comprising stop means limiting pivotal movement of the table beyond a horizontal position.

Claim 9

A retractable work surface system comprising: a pair of vertically-extending, laterally spaced elongate standards, each standard defining a longitudinal channel having a rear wall, a pair of spaced sidewalls extending forwardly from the rear wall, said channel having a forwardly facing restricted opening formed along its length and at the forward region thereof, the restricted opening being defined by a pair of flanges extending inwardly toward each other from the forward end of the sidewalls; means enabling each standard to be secured in an upright position without presenting any obstruction in the channel; an upper yoke slidable in each channel; a lower yoke slidable in each channel; means for releasably securing each of said yokes in any position along its respective channel; an upper link associated with each standard, the upper link being pivoted at one end to the upper yoke; a lower link associated with each standard, the lower link being pivoted at one end to the lower yoke; the forward end of each of the upper links being pivoted to the forward end of each of the lower links at a common pivot; a table secured to the upper links for movement therewith and to connect the linkages for movement in unison with each other; said linkages being movable between a vertical position in which the upper and lower links are in longitudinal alignment with each other and in which at least portions of the upper and lower links are received within the channels in the standards; the combined thicknesses of the upper and lower links being no greater than the width of the slot to facilitate receiving of the links in the slot; stop means limiting pivotal movement of the table beyond a horizontal position; wherein said stop means comprises a shoulder formed on the lower link of at least one of said linkages, the shoulder being engagable with its associated upper link when the table is in its horizontal attitude.

Claim 10

A retractable work surface system comprising: a pair of vertically-extending, laterally spaced elongate standards, each standard defining a longitudinal channel having a rear wall, a pair of spaced sidewalls extending forwardly from the rear wall, said channel having a forwardly facing restricted opening formed along its length and at the forward region thereof, the restricted opening being defined by a pair of flanges extending inwardly toward each other from the forward end of the sidewalls; means enabling each standard to be secured in an upright position without presenting any obstruction in the channel; an upper yoke slidable in each channel; a lower yoke slidable in each channel; means for releasably securing each of said yokes in any position along its respective channel; an upper link associated with each standard, the upper link being pivoted at one end to the upper yoke; a lower link associated with each standard, the lower link being pivoted at one end to the lower yoke; the forward end of each of the upper links being pivoted to the forward end of each of the lower links at a common pivot; a table secured to the upper links for movement therewith and to connect the linkages for movement in unison with each other; said linkages being movable between a vertical position in which the upper and lower links are in longitudinal alignment with each other and in which at least portions of the upper and lower links are received within the channels in the standards; the combined thicknesses of the upper and lower links being no greater than the width of the slot to facilitate receiving of the links in the slot; stop means limiting pivotal movement of the table beyond a horizontal position; wherein said stop means comprises a shoulder formed on the lower link of at least one of said linkages, the shoulder being engagable with its associated upper link when the table is in its horizontal attitude.

Claim 11

A system as defined in claim 6 wherein said stop means is carried by said upper and lower links.