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US 4,111,389 AGranted
Column drawing table
AssigneeFranz Kuhlmann KG
InventorsArnold Gundlach, Hans Eder
Life of this patent
Estimating the term…
Abstract
A column drawing table where the weight is equalized by a gas spring. This gas spring is supported in an elastic receptacle between the column and the pedestal foot, and the column is guided in a hollow pedestal so as to be movable along its length. It can be stopped at an arbitrary position by a fixing brake. A fall safety device, operative completely independently of the fixing brake, prevents the column from unintentionally sinking if the gas pressure in the gas spring should decline or if the fixing brake should be released.
Claims11
A column drawing table comprising:
- a pedestal foot;
- a pedestal mounted on said pedestal foot;
- a column mounted in said pedestal for longitudinal displacement therein;
- a gas spring, one end of which is elastically supported in said pedestal foot, the other end supporting said column, said gas spring acting to equalize the weight of said drawing table, said gas spring generally comprising a piston and a cylinder, one of which is stationary with respect to said pedestal foot;
- a fixing brake coupled between said pedestal and said column to secure said column in arbitrary longitudinal positions;
- and
- a fall safety device to prevent unintentional downward motion of said column when the equilibrium of said column is disturbed, said fall safety device being completely independent of said fixing brake and comprising:
- a lever pivotably connected at one end to said column;
- a tension spring;
- adjustment means coupling the other end of said lever to one end of said tension spring, the other end of said spring being connected to said column to thereby bias said other end of said lever downwardly, said lever being engaged by said gas spring intermediate its ends;
- and
- clamping means coupled between said lever and said one end of said gas spring to prevent unintentional downward movement of said column with respect to said pedestal.
9 more elements
Dependencies are inferred from the claim text.