(57) The present invention provides a door latch comprising a tongue (2) having a projecting
position for latching a door, a handle shaft (1) having a longitudinal axis, at least
one handle which acts on the handle shaft (1) and means (3,5,46) for transmitting
motion of the shaft (1) to the tongue (2), whereby the tongue (2) can be retracted
from its projecting position to unlatch the door in at least two modes including moving
the handle along the said axis, and rotating the handle with respect to the said axis.
Many variations of the means (3-3, 5, 46) for transmitting motion of the shaft (1)
are disclosed. Some of these variations use the conventional D-lever component (46)
alone, some use that component with additional components and further embodiments
avoid use of a D-lever altogether.
Disclosure is made of arrangements in which the extent of projection of the tongue
(2) from the body of the latch is variable. Optional selector means (9, 37) are provided
so as to produce an "either-or" effect between the push-pull and turn modes of operation.
A catch (51-61) which retains the tongue (2) in its retracted position when the door
is open is also described. The catch (51-61) can be automatically released upon closure
of the door.
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