Platform on desktop with elevation function

Disclosed is a platform on desktop with elevation function, including a primary desktop, a primary desktop, an elevation assembly securely mounted to the primary desktop, and a secondary desktop securely mounted to the elevation assembly. The elevation assembly includes opposite arranged first and elevation frames. A positioning assembly includes a positioning member having spaced positioning holes to selectively receive an end of an upper guide pin mounted to a bar of the elevation assembly. A pull handle assembly is rotatably coupled to the positioning member for selectively disengaging the upper guide pin from the positioning member so as to allow the elevation frame to raise or lower down.

(a) TECHNICAL FIELD OF THE INVENTION

The present invention relates generally to a platform on desktop with elevation function, and more particularly to a desktop platform that is disposed on a top of a regular office desk and is movable for changing elevation in order to improve utilization performance of the office desk.

(b) DESCRIPTION OF THE PRIOR ART

Office desks are commonly provided in an office for office staffs to improve working performance.

As shown inFIG. 1, a fixed office desk1is commonly used due to being inexpensive. However, the fixed office desk1has a fixed height and an office staff, when feeling tired, must stand up for stretching, perhaps still handling office job at the same time, in order to maintain or improve working performance. Since the height of the desk1is fixed, it does not allow for change of the height to suit the need for a user to handle his or her jobs.

Thus, it is a challenge of the office furniture manufacturers to provide a height-adjustable platform that allows for change of elevation or height and can be placed on the conventional fixed office desk1to allow a user to change the height of the desk according to physical needs or requirement of work.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a platform on desktop with elevation function for the purposes of improving utilization of an office desk and preventing a significant increase of cost for upgrading an office desk with an elevation function.

In this regard, the technical solution of the present invention according to claim1provides a platform on desktop with elevation function, which comprises a primary desktop, an elevation assembly securely mounted to the primary desktop, and a secondary desktop securely mounted to the elevation assembly, wherein the elevation assembly comprises at least a first elevation frame and a second elevation frame that are arranged opposite to each other in a left-right direction, a cross bar connected between the first elevation frame and the second elevation frame; the first and second elevation frames each comprise an upper connection plate, a positioning assembly mounted on the upper connection plate, an elevation bar assembly having an upper end connected to the upper connection plate, a lower connection plate to which a lower end of the elevation bar assembly is connected; the upper connection plate comprises an upper slide guiding opening formed therein and the lower connection plate comprises a lower slide guiding opening formed therein; the positioning assembly is arranged at one side of the upper slide guiding opening of the upper connection plate and the positioning assembly comprises a positioning member, a pull handle assembly coupled to the positioning member, and two pusher assemblies respectively received and extending through two end portions of the positioning member; the positioning member comprises a plurality of spaced positioning holes formed in one side thereof that faces toward the upper slide guiding opening and the positioning member is provided with mounting sections on a side thereof that is opposite to the side forming the positioning holes such that the mounting sections are arranged for coupling with the pull handle assembly, the positioning member being provided with through barrel sections respectively provided on opposite sides of the mounting sections, the through barrel sections respectively receiving the pusher assemblies to extend therethrough; the elevation bar assembly is arranged such that the upper end thereof connected to the upper connection plate and the lower end connected to the lower connection plate; the elevation bar assembly comprises a first bar, a second bar intersecting and pivotally connected to the first bar to show a cross form, and a return spring connected between the first bar and the second bar; the first bar has an upper end to which an upper guide pin is mounted and the first bar has a lower end to which a lower guide pin is mounted and the upper guide pin is put through and received in the upper slide guiding opening of the upper connection plate and the lower guide pin of the first bar is put through and received in a lower slide guiding opening formed in the lower connection plate; and an end of the upper guide pin is selectively receivable into the positioning holes of the positioning member for positioning so that a stable positioning of the elevation bar assembly is achievable for a raised or lower height thereof.

The efficacy that the technical solution of the present invention according to claim1may achieve is that the elevation bar assembly is structured through connection of the first bar and the second bar that are arranged to intersect each other to show a cross form and are pivotally coupled to each other and two ends of the first bar are allowed to slide with respect to and between the upper slide guiding opening of the upper connection plate and the lower slide guiding opening of the lower connection plate so that in an elevation or lowering operation of the elevation bar assembly, an end of the upper guide pin is receivable in to one of the positioning holes of the positioning member to be positioned thereby so as to provide an effect of stable positioning for the raised or lowered height of the elevation bar assembly.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring firstly toFIGS. 2 and 3, the present invention provides a platform on desktop with elevation function, which is designated at A and will also be referred to as a height-adjustable platform, comprises a primary desktop2, an elevation assembly3securely mounted to the primary desktop2, and a secondary desktop4securely mounted to the elevation assembly3.

As shown inFIGS. 2 and 3, the primary desktop2comprises a plurality of mounting holes21formed therein. The primary desktop2is mounted, via the plurality of mounting holes21, to the elevation assembly3.

As shown inFIGS. 2, 3, and 4, the elevation assembly3comprises a first elevation frame31and a second elevation frame32that are arranged opposite to each other in a left-right direction, a cross bar33connected between the first elevation frame31and the second elevation frame32, and a bottom frame34to which bottoms of the first elevation frame31and the second elevation frame32are mounted.

As shown inFIGS. 2, 3, and 4, the first elevation frame31and the second elevation frame32have identical structures and the first elevation frame31will be taken as an example for description and illustration of details thereof in the following, while details of the second elevation frame32that are identical to those of first elevation frame will not be repeated herein. The first elevation frame31comprises, in sequence from top to bottom, an upper connection plate311, a positioning assembly5mounted on the upper connection plate311, an elevation bar assembly6having an upper end connected to the upper connection plate311, a lower connection plate312to which a lower end of the elevation bar assembly6is connected.

As shown inFIGS. 2, 3, and 4, the upper connection plate311has a top side that defines a top connection section3111in a flat and planar form. The top connection section3111is provided to receive the primary desktop2mounted thereto. The upper connection plate311comprises upper coupling section3112that projects downward from the top connection section3111such that the top connection section3111and the upper coupling section3112are arranged to be substantially perpendicular to each other. More precisely speaking, the upper coupling section3112is set facing away from the primary desktop2. The upper coupling section3112is provided, with an upper slide guiding opening3113formed in one end portion thereof and in the form of an elongate slot.

As shown inFIGS. 2, 3, and 4, the positioning assembly5is arranged at one side of the upper slide guiding opening3113of the upper coupling section3112of the upper connection plate311. The positioning assembly5comprises a positioning member51, a pull handle assembly52coupled to the positioning member51, and two pusher assemblies53respectively received and extending through two end portions of the positioning member51. The positioning member51comprises a plurality of spaced positioning holes511formed in one side thereof that faces toward the upper slide guiding opening3113. The positioning member51is provided with mounting sections512on a side thereof that is opposite to the side forming the positioning holes511. The mounting sections512are arranged for coupling with the pull handle assembly52. The positioning member51is provided with through barrel sections513respectively provided on opposite sides of the mounting sections512and the through barrel sections513respectively receive the pusher assemblies53to extend therethrough.

As shown inFIGS. 2, 3, and 4, the pull handle assembly52comprises a handle521, a joint plate522to which the handle521is pivotally connected, and linking members523for linking the handle521and the positioning member51to each other. The handle521has a cross-section in the form of a V-shaped. The handle521comprises pivot holes5211and connection hole5212formed therein. The joint plate522has a top mounted to the primary desktop2and the joint plate522has a bottom from which two pivot lugs5221project outward. The pivot lugs5221are provided for pivotal connection with the pivot holes5211of the handle521. The linking members523have an end connected to the connection holes5212of the handle521and the linking members523have an opposite end connected to the mounting sections512of the positioning member51.

As shown inFIGS. 2, 3, and 4, the pusher assemblies53are respectively received through the through barrel sections513of the positioning member51. The pusher assemblies53each comprises a bolt531and a push spring532fit over and encompassing the bolt531. The bolt531has an end screwed to the upper coupling section3112of the upper connection plate311. More precisely, the bolts531are respectively screwed to the upper coupling section3112at locations outside two ends of the upper slide guiding opening3113.

As shown inFIGS. 2, 3, and 4, the elevation bar assembly6is arranged such that the upper end thereof connected to the upper connection plate311and the lower end connected to the lower connection plate312. The elevation bar assembly6comprises a first bar61, a second bar62intersecting and pivotally connected to the first bar61to show a cross form, a return spring63connected between the first bar61and the second bar62, an ancillary bar64connected to the first bar61, a tension spring65connected between the ancillary bar64and the lower connection plate312. The first bar61has an upper end to which an upper guide pin611is mounted and the first bar61has a lower end to which a lower guide pin612is mounted. The upper guide pin611is put through and received in the upper slide guiding opening3113of the upper connection plate311and the lower guide pin612of the first bar61is put through and received in a lower slide guiding opening3121formed in the lower connection plate312. A filler plate613is arranged at each interfacing site of the first bar61with the upper slide guiding opening3113and the lower slide guiding opening3121. The filler plate613comprises a through hole6131formed therein. The arrangement of the filler plate613helps reduce the level of noise caused by a sliding movement of the first bar61with respect to and between the upper connection plate311and the lower connection plate312. The second bar62has an upper end coupled to the upper coupling section3112of the upper connection plate311. The second bar62has a lower end coupled to the lower connection plate312. The elevation bar assembly6is structured such that the first bar61and the second bar62intersect each other in a cross form and pivotally coupled to achieve connection therebetween and two ends of the first bar61are respectively slidable with respect to and between the upper slide guiding opening3113of the upper connection plate311and the lower slide guiding opening3121of the lower connection plate312in order to achieve an elevating/lowering operation of the elevation bar assembly6. The ancillary bar64is connected to the first bar61and the ancillary bar64receives the tension spring65to connect thereto with an opposite end of the tension spring65connected to the lower connection plate312so that the tension spring65is connected, in an inclined form, between the ancillary bar64and the lower connection plate312and is located under the return spring63. The arrangement of the tension spring65helps reduce a moving speed of the elevation bar assembly6during a lowering operation and also to improve elevation performance of the elevation bar assembly6.

As shown inFIGS. 2, 3, and 4, the lower connection plate312comprises the lower slide guiding opening3121formed therein and the lower slide guiding opening3121receives the lower guide pin612of the first bar61therethrough and sliding therein. The lower connection plate312receives the lower end of the second bar62to couple thereto and a bottom of the lower connection plate312is mounted to the bottom frame34.

As shown inFIGS. 2 and 3, the bottom frame34receives the lower connection plate312to mount thereto. The bottom frame34is a rectangular frame.

As shown inFIGS. 2 and 3, the secondary desktop4is mounted to the upper connection plate311and, more precisely, the secondary desktop4is mounted to the top connection section3111of the upper connection plate311.

In an embodiment of the present invention, the height-adjustable platform A of the present invention is directly installed on a desktop B of an office desk. As shown inFIGS. 3, 5, 8, and 9, the height-adjustable platform A is raised to a highest position thereof, the upper guide pin611of the first bar61of the elevation bar assembly6slides to an end of the upper slide guiding opening3113of the upper connection plate311(the rightmost location shown inFIG. 5) and the lower guide pin612slides, at the same time, to an end of the lower slide guiding opening3121of the lower connection plate312(the leftmost location shown inFIG. 5) such that one end of the upper guide pin611gets into one of the positioning holes511of the positioning member51to be positioned thereby. In this way, the two ends of the first bar61of the elevation bar assembly6define a height difference of a maximum available limit so that the primary desktop2is raised to a location distant from the desktop B of the office desk, meaning the height-adjustable platform A is in a situation of being raised to a highest position.

As shown inFIGS. 3, 6, 7, 8, 9, and 10, to reduce the height of the height-adjustable platform A, the pull handle assembly52is pulled such that the pull handle assembly52takes advantage of a leverage effect provided by the linking member523to swing the positioning member51easily from an initial position, whereby the upper guide pin611of which the end is received in the positioning holes511of the positioning member51is allowed to disengage from the positioning holes511. Under this condition, the primary desktop2can be pressed down to lower the primary desktop and at the same time, the elevation bar assembly6is released from constraint to allow ends of the first bar61and the second bar62to move toward and approach each other. In other words, the elevation bar assembly6is in an operation of lowering down until the pull handle assembly52is released to allow the pusher assemblies53to push the positioning member51back to the initial position, where the end of the upper guide pin611is received into and kept in position by one of the positioning holes511of the positioning member51. The height of the elevation bar assembly6through the elevation or lowering operation thereof is determined or constrained by the one of the positioning holes511of the positioning member51that receives the end of the upper guide pin611to fit therein. In this way, multiple stage positioning of the elevation bar assembly6in respect of the height thereof can be achieved for both the elevation operation and lowering operation and this allows a user to select and use a desired height.

The efficacy of the present invention is that the elevation bar assembly6comprises a first bar61, a second bar62intersecting and pivotally connected to the first bar61to show a cross form, and a return spring63connected between the first bar61and the second bar62; the first bar61has an upper end to which the upper guide pin611is mounted and the first bar61has a lower end to which the lower guide pin612is mounted, where the upper guide pin611is put through and received in the upper slide guiding opening3113of the upper connection plate311and the lower guide pin612of the first bar61is put through and received in the lower slide guiding opening3121of the lower connection plate312; the elevation bar assembly6is structured such that the first bar61and the second bar62intersect each other in a cross form and pivotally coupled to achieve connection therebetween and two ends of the first bar61are respectively slidable with respect to and between the upper slide guiding opening3113of the upper connection plate311and the lower slide guiding opening3121of the lower connection plate312; and the positioning assembly5comprises a positioning member51, a pull handle assembly52coupled to the positioning member51, and two pusher assemblies53respectively received and extending through two end portions of the positioning member51; and further that the positioning member51comprises the plurality of spaced positioning holes511formed in one side thereof that faces toward the upper slide guiding opening3113and the positioning member51is provided with the mounting sections512on a side thereof that is opposite to the side forming the positioning holes511such that the mounting sections512are arranged for coupling with the pull handle assembly52and the positioning member51is provided with the through barrel sections513respectively provided on opposite sides of the mounting sections512and the through barrel sections513respectively receive the pusher assemblies53to extend therethrough, whereby in an elevation or lowering operation of the elevation bar assembly6, an end of the upper guide pin611is receivable in to one of the positioning holes511of the positioning member51to be positioned thereby so as to provide an effect of stable positioning for the raised or lowered height of the elevation bar assembly6.