Fastening (or closing) device working by passing the dead point

摘要

The fixing/seal is made in one piece and comprises a base (1) with two or more opposite and pivoted fixing lugs (3). The lugs can occupy positions which are close together or apart, passing through dead points between. Each lug is connected by a first hinge (6) to a curved tongue (2) which is in turn pivoted to the base (1). They are also pivoted, by a second hinge (8) to a central member (9) which is linked to the base and extends between the curved tongues. The two curved tongues have their concave sides facing outwards. Each one has an outward projection (10) which acts as a thrust surface for a guide peg on the outside of the lug, the inner surface of which can have a lengthwise rib.