(57) A friction stay 10 for controlling the opening and closing movement of an openable
member relative to a fixed frame on which the member is mounted, in which the friction
stay comprises: a track member 11 securable to a frame element of the fixed frame;
a vent arm member 12 securable to a frame element of the openable member; a link arm
13 pivotally connected at one end 14 to one end 15 of the track member 11, and pivotally
connected at its other end 16 to a pivot connection 17 on the vent arm member 12;
a slide 18 mounted on the track member and having an end position, at or near to an
opposite end 19 of the track member 11, to correspond with a closed position of the
openable member, and being movable along the track member 11 away from the end position
and in a direction towards said one end 15 of the track member during opening movement
of the friction stay; and, a parallelogram linkage 20 connecting the vent arm member
12 and the link arm 13 to the slide 18 in order to control the movement of the friction
stay between the closed position in which the components of the stay overlie the track,
and any required open position of the friction stay: in which at least one end 14,
16 of the link arm 13 has a curved bearing surface 26, 29, adjacent to its pivot connection
to the respective one of the vent arm member 12 or track member 11, and which is engageable
with a corresponding curved bearing surface 27, 30 on the member so as to relieve
at least some of the load applied to the pivot connection 17, 32 during opening and
/ or closing movement of the friction stay.
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