GB284605A - - Google Patents

Abstract

284,605. Maatschappij tot Vervaardiging van Snijmachines Volgens van Berkels Patent en van Andere Werktuigen, (Assignees of Berkel, C. F. M. van, and Duyn, A. van.). Jan. 31, 1927, [Convention date]. Fluid-friction vibrationdampers applied to weighing machines consist of inner and outer cylinders both closed by the same piston and so associated that the piston acts against liquid under pressure on both its up and down strokes. The piston b is stepped to engage both the outer cylinder a and the inner cylinder a<1>. The lower chamber so formed is connected bv a pipe l and port m with the inner cylinder a<1> which communicates with an upper reservoir h open to the atmosphere. The annular chamber f also communicates through the port k with the inner cylinder a'. The areas of the ports m and are controlled by a sleeve valve n adjustable by a lever p and screw s, the port m regulating the downward movement and the port k the upward movement of the piston. The sleeve i on the cover h<1> prevents splashing and the large capacity of the upper reservoir h avoids spilling when the apparatus is laid on its side as during transport. The passages between the different chambers might be dispensed with and clearance left between the piston and the cylinder walls.