Vibration damper

Winding – tensioning – or guiding – Coil holder or support – Spool or core

Patent

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Details

188282, 188317, 267221, B65H 5442, B61K 702, F16F 950

Patent

active

048260940

ABSTRACT:
A damper assembly comprises a cylinder enclosing a plunger mounted on a piston rod and associated with an auxiliary plunger which is yieldably held against the main plunger by a spring. Ascent of the cylinder relative to the plunger allows a high damping force to be obtained by causing the damping liquid to pass around the exterior of the main plunger, along a first flow path, whereas descent of the cylinder allows the spring to yield and to open a larger cross-section third flow path between the auxiliary plunger and the main plunger for a lower damping force to be obtained. The damping force exerted in the first-mentioned direction is limited by the effect of a pressure relief valve which opens to allow flow of hydraulic fluid through the auxiliary plunger along a second flow path once a predetermined damper force has been attained. The cylinder is coaxially surrounded by a pre-load spring. The damper is incorporated in an anti-bounce package support in a yarn winder.

REFERENCES:
patent: 2719612 (1955-10-01), de Previnquieres
patent: 2800981 (1957-07-01), Allinquant
patent: 3016205 (1962-01-01), Barnes, Jr.
patent: 3043404 (1962-07-01), Peras
patent: 3299990 (1967-01-01), Ratcliffe
patent: 3419113 (1968-12-01), Shelley
patent: 4126302 (1978-11-01), Curnutt
patent: 4407396 (1983-10-01), Sirven
patent: 4474271 (1984-10-01), Molders et al.

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