Disclosed is a projection and communication board, having a double-sided enamelled steel plate with an enamel undercoat, on which a second white enamel coat is laid on the writing side, which after annealing presents a roughness defined by Ra =0.6-1.2 μm, Rz =3.0-8.0 μm, and R3z =3.0-8.0 μm. On this a third thin finishing coat is applied consisting of enamel powder, more than 90% of which consists of grains of less than 15 μm, and which after annealing presents a roughness defined by Ra =0.4-1.4 μm, Rz =2.0-6.0 μm, and R3z =2.0-6.0 μm.

A dual-sided storage bin includes a housing containing first and second storage recesses with access openings on opposite sides of the storage bin. The back wall of each storage recess forms a utility surface for the opposite side of the storage bin. As a result, individuals on each side of the storage bin are provided with both a storage recess and a utility surface.

Disclosed are: a caster mounted on a teaching aid including a whiteboard, or furniture, etc. so as to conveniently and stably convert between a movement state and a stopping state; and a whiteboard including the caster. The present invention relates to a caster comprising: a wheel which is coupled to the lower end of a fixing shaft having a male screw formed on the upper side thereof so that a nut is fastened; a wheel moving means which comprises a slide member and an eccentric rotation member, wherein the slide member has a shaft hole punched on the central part thereof so as to allow the fixing shaft of the wheel to be penetrated and fastened by the nut, and has a working shaft hole formed on the circumferential surface thereof, and the eccentric rotation member has an eccentric shaft formed at one side thereof and a shaft bolt formed protrudingly from the center part of the other side thereof, the eccentric shaft being fitted into the working shaft hole of the slide member; a main body which comprises a first operating space, a second operating space, a third operating space, and a female screw, wherein the first operating space is penetrated at the central part thereof in the vertical direction so that the slide member is fitted thereto and can move up and down, the second operating space enables the wheel to rotate and move up and down, the third operating space is penetrated in the horizontal direction so that an eccentric member is fitted thereto and the eccentric shaft can be introduced into the first operating space, and the female screw is formed on the upper part of the main body for the fastening purpose; a working lever which has a coupling hole punched on the central part thereof, the coupling hole being fitted into the shaft bolt of the eccentric rotation member; a fixing nut which is screw-coupled to the shaft bolt of the eccentric rotation member so as to fix the working lever; and a fixing means which comprises a first fixing part or a second fixing part so as to prevent the eccentric rotation member fitted into the third operating space of the main body from being detached and stop the rotation of the eccentric rotation member. The caster is mounted on a pedestal fixed to the lower end of a column frame on which the whiteboard is mounted.

Disclosed are: a caster mounted on a teaching aid including a whiteboard, or furniture, etc. so as to conveniently and stably convert between a movement state and a stopping state; and a whiteboard including the caster. The present invention relates to a caster comprising: a wheel which is coupled to the lower end of a fixing shaft having a male screw formed on the upper side thereof so that a nut is fastened; a wheel moving means which comprises a slide member and an eccentric rotation member, wherein the slide member has a shaft hole punched on the central part thereof so as to allow the fixing shaft of the wheel to be penetrated and fastened by the nut, and has a working shaft hole formed on the circumferential surface thereof, and the eccentric rotation member has an eccentric shaft formed at one side thereof and a shaft bolt formed protrudingly from the center part of the other side thereof, the eccentric shaft being fitted into the working shaft hole of the slide member; a main body which comprises a first operating space, a second operating space, a third operating space, and a female screw, wherein the first operating space is penetrated at the central part thereof in the vertical direction so that the slide member is fitted thereto and can move up and down, the second operating space enables the wheel to rotate and move up and down, the third operating space is penetrated in the horizontal direction so that an eccentric member is fitted thereto and the eccentric shaft can be introduced into the first operating space, and the female screw is formed on the upper part of the main body for the fastening purpose; a working lever which has a coupling hole punched on the central part thereof, the coupling hole being fitted into the shaft bolt of the eccentric rotation member; a fixing nut which is screw-coupled to the shaft bolt of the eccentric rotation member so as to fix the working lever; and a fixing means which comprises a first fixing part or a second fixing part so as to prevent the eccentric rotation member fitted into the third operating space of the main body from being detached and stop the rotation of the eccentric rotation member. The caster is mounted on a pedestal fixed to the lower end of a column frame on which the whiteboard is mounted.

A partition wall usable in any residential or work environment is described having modules that can be customized to create a partition wall that best suits the needs of the user. The modules that make up the partition wall can be made from a single frame structure or multiple frame components that connect together to form generally rectangular or square like modules or building blocks that form the partition wall. The modules can connect to any adjacent module on each side or top or bottom. The modules are assembled into the requisite number of rows and columns to form the partition wall at the desired width and height. The modules include electrical contacts to provide electrical power to one or more add on pieces that require power to function, including, fans and light panels. Further, sound batting can be added, and decorative panels to provide an aesthetically pleasing appearance.

A partition wall usable in any residential or work environment is described having modules that can be customized to create a partition wall that best suits the needs of the user. The modules that make up the partition wall can be made from a single frame structure or multiple frame components that connect together to form generally rectangular or square like modules or building blocks that form the partition wall. The modules can connect to any adjacent module on each side or top or bottom. The modules are assembled into the requisite number of rows and columns to form the partition wall at the desired width and height. The modules include electrical contacts to provide electrical power to one or more add on pieces that require power to function, including, fans and light panels. Further, sound batting can be added, and decorative panels to provide an aesthetically pleasing appearance.

The present invention discloses a writing board, solving the problems of large occupied space due to large area, high transportation cost, easy damage and high scrappage rate in the existing writing board. The writing board has the technical solution that the writing board comprises a body, wherein the body comprises a board body; the board body comprises a left board and a right board; the body also comprises fastening parts; locating parts fastened with the fastening parts are arranged on the left board and the right board; grooves are formed in the locating parts; each fastening part comprises an inverted hooking part; and the inverted hooking parts are embedded into the grooves. The writing board of the present invention has the advantages of reduction of transportation cost, convenient presentation, simple structure and convenient use and can be lengthened infinitely.

The present invention discloses a writing board, solving the problems of large occupied space due to large area, high transportation cost, easy damage and high scrappage rate in the existing writing board. The writing board has the technical solution that the writing board comprises a body, wherein the body comprises a board body; the board body comprises a left board and a right board; the body also comprises fastening parts; locating parts fastened with the fastening parts are arranged on the left board and the right board; grooves are formed in the locating parts; each fastening part comprises an inverted hooking part; and the inverted hooking parts are embedded into the grooves. The writing board of the present invention has the advantages of reduction of transportation cost, convenient presentation, simple structure and convenient use and can be lengthened infinitely.

A method for providing a collaboration session using a designated control pen includes receiving graphical content from either a first computing device associated with a first pen tool or a second computing device associated with a second pen tool. A request can be received from the first computing device to designate the first pen tool as the control pen. In response to the request, the first pen is designated as the control pen and the second pen is disabled so long as the first pen tool retains the control pen designation. The graphical content can be modified based on the interactions made with the designated control pen at the first display area. The modified graphical content is globally displayed, which includes providing the modified graphical content to the second computing device for display at the second display area.

The present invention provides tablets with interconnection features and a system of multiple tablet assemblies removably interconnected to one another. The tablets may be removably mounted to a vertical surface or positioned on a horizontal surface. Features of the present invention allow a user to remove or move one tablet from the system without disrupting or moving the other tablets.