Movable table

Abstract

A movable table positioned to a predetermined position with respect to a base through manual movement, fixed to the base after the positioning. A lift mechanism that releases a top plate from a fixed state and lifts the top plate from the base against an attraction force of a magnet, or against the attraction force and the gravity of the magnet, and a mechanism that lowers the top plate from a predetermined lifted position with either or both the attraction force or the gravity of the magnet, and fixes the top plate to the base with an action of the attraction force of the magnet.

1 . A movable table mounted on a base made of steel or iron, the movable table being positioned to a desired position with respect to the base through manual movement, and fixed to the base after positioning, comprising:
 a top plate;   a magnet bonded to a bottom surface of the top plate, the magnet attracting the base to fix the top plate to the base; and   a lift mechanism, the lift mechanism releasing the top plate from a fixed state and lifting the top plate from the base against an attraction force of the magnet, or against the attraction force and the gravity of the magnet, and lowering the top plate from a predetermined lifted position with either the attraction force or the gravity of the magnet, or with both the attraction force and the gravity of the magnet, and fixing the top plate to the base with an action of the attraction force of the magnet, the lift mechanism including:
 at least two operation levers, each operation lever being rotatable between a free position and a movement position around a supporting point, 
 shafts integrally arranged with the operation levers, the shafts being oppositely rotated within rotation angle ranges of the operation levers in accordance with rotation of the operation levers, and 
 cams integrally formed with the shafts, the cams coming into contact with a top plate mount surface of the base, the surface on which the top plate is mounted, and being operable to be located at a position in which the top plate is lifted from the base or at a position in which the top plate is lowered to the base in accordance with the opposite rotation of the shafts. 
   
   
   
       2 . The movable table according to  claim 1 , wherein either the top plate or the magnet, or both the top plate and the magnet have a rotation shaft guide groove guiding a rotation of each shaft, and a clearance serving as a retracted position for each cam. 
   
   
       3 . The movable table according to  claim 1 , wherein each operation lever has a forced stop mechanism to define a movement limit at the movement position to stop a corresponding operation lever, the top plate being located at an upper end position when the corresponding operation lever is located at a forced stop position. 
   
   
       4 . The movable table according to  claim 1 , wherein when the top plate is located at the upper end position, the magnet keeps a magnetic force against the base such that the top plate is enabled to easily move in any direction with an external force applied by a user that moves the operation levers located at forced stop positions.