Labor saving device

A device to handle and manage a heavy screen includes a supporting module, a connecting module, two first resilient members, and two second resilient members. The connecting module includes a mounting rod provided with a pulling rod at a middle portion, and two pivot rods rotatably installed on one end far away from the mounting rod of the pulling rod. Each first resilient member is connected to an end of the top plate, and each second resilient member is connected to an end of the bottom plate and one end of a pivot rod. The two first resilient members are stretched when screen is pulled down, and each pivot rod rotates relative to the pulling rod to pull the two second resilient members when screen is lifted. The screen is effectively weightless, enabling static positioning of the screen.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 201710448536.3 filed on Jun. 14, 2017 the contents of which are incorporated by reference herein.

FIELD

The subject matter herein generally relates to labor saving device.

BACKGROUND

An electronic whiteboard is typically fixed by the bracket for the ease of using. However, since the electronic whiteboard is heavy, it is necessary to use strength to push the electronic whiteboard when the position of the electronic whiteboard needs to be changed strength is also required to make the electronic whiteboard stop moving.

DETAILED DESCRIPTION

The term “outside” refers to a region that is beyond the outermost confines of a physical object. The term “inside” indicates that at least a portion of an object is contained within a boundary formed by another object. The term “substantially” is defined to be essentially conforming to the particular dimension, shape, or other feature that the term modifies, such that the component need not be exact. For example, “substantially cylindrical” means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising” means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in a so-described combination, group, series, and the like.

FIG. 1illustrates one exemplary embodiment of a labor saving device100installed onto an electronic whiteboard (not shown) to conveniently move the electronic whiteboard. The labor saving device100includes a supporting module20, two first resilient members30, two second resilient members40and a connecting module50. In at least one embodiment, the first resilient members30and the second resilient members40are spring dampers.

FIG. 1andFIG. 2illustrate that the supporting module20includes a top plate21, a bottom plate22parallel to the top plate21, and a connecting plate25connecting the top plate21with the bottom plate22. One side of the top plate21is provided with a side plate23, and the same side of the bottom plate22is provided with a side plate23. The side plate23defines a plurality of securing holes235, a plurality of fasteners (not shown) can pass through the securing holes235to secure the supporting module20. In at least one embodiment, the fasteners pass through the securing holes235to be inserted into a wall to secure the supporting module20on the wall. The ends of the connecting plate25are respectively connected to the side plate23of the top plate21and the side plate23of the bottom plate22to connect the top plate21with the bottom plate22.

A connecting rod211is vertically connected to each end of the top plate21. The far end of each rod211away from the top plate21is provided with a fixing member212, and each fixing member211is configured to connect to one end of each first resilient member30. The bottom plate22defines a through hole221in the middle portion and a stopper column222is located on two sides of the through hole221. The two stopper columns222are parallel to each other. The lengths of two stopper columns222are approximately equal. Each end of the bottom plate22is provided with a securing column225. Each securing column225is connected with one end of each second resilient member40.

The connecting module50includes two side rods51parallel to each other, and a mounting rod52connected between the two side rods51. Each end of the mounting rod52is provided with a securing member521to connect to the other end of each first resilient member30. A middle portion of the mounting rod52is provided with a pulling rod55, and the pulling rod55can pass through the through hole221of the bottom plate22. One end away from the mounting rod52of the pulling rod55is provided with a pivot member56. Each side of the pivot member56is provided with two pivot shafts561. Two pivot rods60are rotatably installed on the pivot member56.

Each pivot rod60includes a first end61and a second end62. The first ends61of two pivot rods60are close to each other, and the second ends62of two pivot rods60are far away from each other. The first end61of each pivot rod60is rotatably installed on the pivot shaft561. The second end62of each pivot rod60includes a securing shaft625, and each securing shaft625is configured to connect to the other end of each second resilient member40.

FIGS. 1 to 3illustrate assembly of the labor saving device100. The fasteners pass through the securing holes235of the side plate23to secure the supporting module20. The connecting module50is placed on the supporting module20. One end of each first resilient member30is connected to the fixing member212of the connecting rod211, the other end of each first resilient member30is connected to the securing member532of the mounting rod52. Thus, the connecting module50is connected with the supporting module20by the two resilient members30.

The pulling rod55passes through the through hole221of the bottom plate22, the first end61of each pivot rod60is rotatably installed on the pivot shaft561. One end of each second resilient member40is secured on the securing shaft625of each pivot rod60(shown inFIG. 2), and the other end of second resilient member40is secured on the securing column225of the bottom plate22. Thereby, the labor saving device100is assembled.

When the electronic whiteboard is mounted on the labor saving device100, the two first resilient member30are elastically stretched to overcome the weight of the electronic whiteboard, and the two pivot rods60are parallel to each other and are in the same horizontal line. In at least one embodiment, the connection between the electronic whiteboard and the labor saving device100is a conventional technical means, and the present invention is not repeated here.

AsFIGS. 3 and 4illustrate, when the electronic whiteboard is to be moved vertically downward, the electronic whiteboard is pulled down vertically and the connecting module50is driven downwardly. The mounting rod52drives the first resilient member30to continue stretching. Due to the weight of the electronic whiteboard, it is not requiring too much force to pull the electronic whiteboard. The electronic whiteboard is continuously pulled down and the two pivot rods60abut against the two stopper columns222.

The pulling rod55continues to drive the pivot rods60downwardly. The first end61of each pivot rod60is rotated relative to the pivot shaft561, and the second end62of each pivot rod60is moved upwardly to stretch the two second resilient members40. The two second resilient members40are elastically stretched so that the electronic whiteboard can be easily stopped. At this time, the electronic whiteboard maintains its current position due to the damping effect of the two first resilient members30and the two second resilient members40.