TITLE: IMPROVED PISTON FOR AN AIR SPRING OR THE LIKE
European Patent EP0002144
 B1

ABSTRACT:
Abstract of EP0002144
1. Piston for pneumatic spring or other telescopic system with a
cylinder (1) and plunger rod (6), the piston (7) being designed to be
slidably fitted in teh cylinder (1) for guiding therein the plunger rod
(6) and subdividing it into two pneumatic chambers located on both
sides of the piston (7) and connected with each other via a calibrated
passage (74) formed through the piston (7) which, while being cast
solid and constituted entirely of one and a single homogeneous moulded
piece, presents an elaborate geometrical shape defined by an annular
indentation (75) which extends all around a practically indeformable,
bulky central core (76) and which separates the latter from a flexible
peripheral skirt (77) tightly and slidably engaging the wall of the
cylinder (1), characterized in that the material of this single-piece
piston (7) thus shaped is an acetal resin (formaldehyde polymer) and in
that the flexibility of the peripheral skirt (77) provides from its
connection (78) to the bulky central core (76), which is located at the
level of the annular indentation (75) to constitute the bottom (75B)
thereof and which operates so as to speak as a sham hinge for said
skirt (77).

INVENTORS:
Allinquant, Jacques

APPLICATION NUMBER: EP19780400160
PUBLICATION DATE: 06/24/1981
FILING DATE: 10/31/1978

ASSIGNEE: SOCIETE J.G. ALLINQUANT
INTERNATIONAL CLASSES: F16F9/02; F16F9/32; F16F9/34; F16F9/02; F16F9/32; F16F9/34; (IPC1-7):
F16J1/01; F16F9/02; F16F9/32; F16F9/34
EUROPEAN CLASSES: F16F9/02B3; F16F9/32B2; F16F9/34A