Abstract:
A paper attachment device is composed of a cap ( 10 ), a cup ( 20 ), a driving plate ( 30 ) and a magnet ( 40 ) axially combined in sequence. The cap ( 10 ) has a stud movably penetrating through the cup ( 20 ) and the driving plate ( 30 ) and firmly secured with the magnet ( 40 ). The driving plate ( 30 ) has multiple resilient arms ( 30 ) pressing the cup ( 20 ) toward the cap ( 10 ), whereby paper can be held between the cup ( 20 ) and the cap ( 10 ) to make the paper attachment device versatile in usage.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a paper attachment device, and more particularly to a paper attachment device that can attach multiple sheets paper to a magnetic surface in two ways. 
     2. Description of Related Art 
     With reference to FIG. 7, a conventional paper attachment device ( 60 ) mounted on a whiteboard ( 50 ) is usually composed of a magnet and a plastic shell housing the magnet inside. The magnet provides a magnetic force to detachably mount the paper attachment device ( 60 ) on the whiteboard ( 50 ) whereby multiple pieces of paper are squeezed and held between the whiteboard ( 50 ) and the paper attachment device ( 60 ) by the magnetic force. 
     There are, however, two problems with this conventional paper attachment device ( 60 ): 
     1. In particular, only a few pieces of paper can be held between the whiteboard ( 50 ) and the paper attachment device ( 60 ) because the magnetic force is only strong enough. Therefore, the paper attachment device ( 60 ) easily drops off the magnetic surface or will not attach to the whiteboard ( 50 ). 
     2. To change the piece of paper, the paper attachment device ( 60 ) has to be removed from the whiteboard ( 50 ) to remove the paper and replace it with a new sheet. Then, the paper attachment device ( 60 ) is placed on the new paper to attach the paper to the whiteboard ( 50 ). Therefore, a person must perform multiple steps to change the paper. 
     The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional paper attachment device. 
     SUMMARY OF THE INVENTION 
     The main objective of the present invention is to provide a paper attachment device that can attach multiple pieces of paper to a magnetic surface in two ways. 
     Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an exploded perspective view of a paper attachment device in accordance with the present invention; 
     FIG. 2 is a perspective view of the paper attachment device in FIG. 1 showing multiple pieces of paper attached by magnetic force; 
     FIG. 3 is a cross-sectional side plan view of the paper attachment device in FIG. 2 when the paper attachment device is attached to a magnetic surface; 
     FIG. 4 is a perspective view of the paper attachment device in FIG. 1 showing multiple pieces of paper attached to the paper attachment device by a clipping force; 
     FIG. 5 is a cross-sectional side plan view of the paper attachment device in FIG. 4 with the paper attachment device clipping multiple pieces of paper; 
     FIG. 6 is a cross-sectional side plan view of another embodiment of the paper attachment device in accordance with the present invention; and 
     FIG. 7 is a perspective view of a conventional paper attachment device in accordance with the prior art. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     With reference to FIGS. 1 to  3 , a paper attachment device in accordance with the present invention is composed of a cap ( 10 ), a cup ( 20 ), a driving plate ( 30 ), and a magnet ( 40 ). 
     The cap ( 10 ) is a dome with a concave inner surface, an opening and a flat edge around the opening. A stud ( 11 ) extends from the concave inner surface toward the cup ( 20 ). The stud ( 11 ) has a distal end and a threaded hole ( 110 ) is formed longitudinally in the distal end of the stud ( 11 ). The flat edge around the opening allows users to hold the cap ( 10 ) easily. 
     The cup ( 20 ) is also a dome with an inner recess ( 23 ), a center and an outer periphery. A through hole ( 21 ) is defined in the center of the dome through which the stud ( 11 ) of the cap ( 10 ) passes, and the cap ( 10 ) is mounted on the outer periphery of the cup ( 20 ). 
     The driving plate ( 30 ) is a circular plate, has a center and a top surface ( 34 ) and is movably mounted inside the inner recess ( 23 ) of the cup ( 20 ). A housing ( 32 ) with a top surface ( 34 ) is formed in the center of the driving plate ( 30 ) to hold the magnet ( 40 ). Multiple resilient arms ( 35 ) are formed on the top surface ( 34 ) of the housing ( 32 ) and extend toward the cup ( 20 ). A hole ( 36 ) is defined through the housing ( 32 ) to align with the through hole ( 21 ) in the cup ( 20 ). Additionally, the resilient arms ( 35 ) are curved and formed around the top surface ( 34 ) of the housing ( 32 ) to press against the cup ( 20 ) to provide a regular resisting force to the cup ( 20 ) when the cup ( 20 ) is compressed. 
     The magnet ( 40 ) is mounted inside the housing ( 32 ) of the driving plate ( 30 ) and has a counter sunk hole ( 41 ) defined through the magnet ( 40 ) to align with the hole ( 36 ) in the driving plate ( 30 ). Means to moveably connect the cap ( 10 ) to the other elements of the paper attachment device is provided at the end of the stud ( 11 ). In the preferred embodiment, a bolt ( 44 ) is mounted in the counter sunk hole ( 41 ) screws into the threaded hole ( 110 ) in the stud ( 11 ) that passes through the through hole ( 21 ) in the cup ( 20 ), the hole ( 36 ) in the driving plate ( 30 ) and into the magnet ( 40 ). 
     With reference to FIGS. 2 and 3, one way of attaching sheets of paper ( 50 ) to a magnetic surface such as a whiteboard ( 60 ) is to sandwich the multiple pieces of paper ( 50 ) between the whiteboard ( 60 ) and the paper attachment device in a conventional way. With reference to FIGS. 4 and 5, another way for the paper attachment device to hold paper ( 50 ) is to press the cup ( 20 ) toward to the whiteboard ( 60 ). The cup ( 20 ) presses the resilient arms ( 35 ) on the driving plate ( 30 ) and form a gap (A) between the cap ( 10 ) and cup ( 20 ). Pieces of paper ( 50 ) can be put into the gap (A). When the cup ( 20 ) is released, the resilient arms ( 35 ) push the cup ( 20 ) back toward the cap ( 10 ). The resilient arms ( 35 ) acting on the cup ( 20 ) securely hold the paper between the cup ( 20 ) and the cap ( 10 ). Therefore, the paper attachment device does not need to be detached from the whiteboard ( 60 ) to change or remove pieces of paper ( 50 ) and the paper ( 50 ) does not form a buffer between the magnetic surface and the magnet ( 40 ). 
     With reference to FIG. 6, another means to moveably connect the cap ( 10 ) to the other elements of the paper attachment device in accordance with the present invention is an enlarged head ( 111 ) formed on the stud in the counter sunk hole ( 41 ). The enlarged head ( 111 ) firmly attaches the cap ( 10 ) to the cup ( 20 ) and obviates the need for a bolt ( 44 ). 
     Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.