Height Positioning Device for a Presentation Device

Abstract

A height positioning device for a presentation device contains a carrier to which a presentation element can be fastened, and a mount to which the carrier is attached and movable between first and second height positions. Also provided are a flexible traction mechanism having one end fastened to the carrier and a second end fastened to the mount or a stationary element, and a deflection element around which the traction mechanism is guided in the manner of a pulley. To hold the carrier at any desired position, the height positioning device contains a gas compression spring having a first end fastened to the deflection element and a second end supported on the mount, an element of fixed height, on the carrier or an element which can be moved with the carrier, such that the spring compensates for a weight of the carrier and the presentation element.

1 . A height positioning device for a presentation device, the height positioning device comprising:
 a carrier for fastening to at least one presentation element;   a mount attach to said carrier so as to be able to move said carrier between a first and a second height position;   at least one flexible traction mechanism having a first end fastened to one of said carrier and an element which can be moved with said carrier and a second end fastened to one of said mount and an element of fixed height;   at least one deflection element around which said at least one flexible traction mechanism is guided in a manner of a pulley; and   a pneumatic piston mechanism having a first end fastened to said at least one deflection element and a second end supported on one of said mount, the element of fixed height, on said carrier, and on the element which can be moved with said carrier, such that said pneumatic piston mechanism substantially compensates for a total weight of said carrier and the at least one presentation element which can be fastened thereto to hold said carrier at any desired position between the first and the second height positions.   
   
   
       2 . The height positioning device according to  claim 1 , wherein precisely one said pneumatic piston mechanism is provided. 
   
   
       3 . The height positioning device according to  claim 1 , wherein:
 said deflection element being said pulley has at least one deflection roller;   said carrier having two fastening points being disposed substantially centrally in a width direction of said carrier; and   precisely one said flexible traction mechanism is provided, and is guided between said two fastening points via said at least one deflection roller of said pulley.   
   
   
       4 . The height positioning device according to  claim 1 , wherein:
 said carrier having fastening points;   said flexible traction mechanism is one of two traction mechanisms; and   said deflection element being said pulley has two parallel deflection rollers, said two traction mechanisms each being guided between said fastening points via one of said two parallel deflection rollers, one of said fastening points for said two traction mechanisms being provided on different sides of said carrier.   
   
   
       5 . The height positioning device according to  claim 1 , wherein said pneumatic piston mechanism is a gas compression spring. 
   
   
       6 . The height positioning device according to  claim 1 , wherein said at least one flexible traction mechanism is guided in a manner of a single pulley. 
   
   
       7 . The height positioning device according to  claim 1 , wherein said mount has a first guide element and said carrier has a second guide element which is complementary to said first guide element, so that said carrier is guided between the first and the second height positions along said mount. 
   
   
       8 . The height positioning device according to  claim 1 , further comprising a movable undercarriage and said mount is mounted on said movable undercarriage. 
   
   
       9 . The height positioning device according to  claim 1 , wherein said mount can be mounted on a stationary element. 
   
   
       10 . The height positioning device according to  claim 1 , wherein at least one further board element is fastened to at least one of said carrier and said mount. 
   
   
       11 . The height positioning device according to  claim 1 , further comprising at least one means disposed on at least one of said mount and said carrier for fastening or depositing at least one peripheral apparatus of the presentation element of the presentation device. 
   
   
       12 . The height positioning device according to  claim 1 , wherein the at least one presentation element is selected from the group consisting of a screen, a whiteboard, a projection board, an integrated unit having a projection board and a projector directed toward the projection board, a projection board, a projector fastened to a projector arm and directed toward the projection board, and a projector. 
   
   
       13 . The height positioning device according to  claim 5 , wherein said gas compression spring is a damped gas compression spring. 
   
   
       14 . A height positioning device for a presentation device, the height positioning device comprising:
 a mount;   a carrier for fastening at least one presentation element, said carrier attached to said mount so as to be able to move between a first and a second height position;   at least one flexible traction mechanism having a first end fastened to one of said carrier and an element which can be moved with said carrier and a second end fastened to one of said mount and an element of fixed height;   at least one deflection element around which said at least one flexible traction mechanism is guided in a manner of a single pulley; and   a gas compression spring having a first end fastened to said at least one deflection element and a second end supported on one of said mount, the element of fixed height, on said carrier, and on the element which can be moved with said carrier, such that said gas compression spring substantially compensates for a total weight of said carrier and the at least one presentation element which can be fastened thereto to hold said carrier at any desired position between the first and the second height position.