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Rev. A.1, 8/01
lines and knowledge of the gap between the springlatch and deadlatch pin are used to
determine the vertical position of the springlatch plunger. When this gap is greater than ¼",
best reliability is obtained when the springlatch plunger position is centered on the springlatch.
When the gap is smaller than ¼", however, simply centering the springlatch plunger risks
positioning the deadlatch pin too close to the springlatch plunger so the procedure is to position
the edge of the springlatch plunger midway between the springlatch and deadlatch pin. Figure 2
illustrates these points.
FIG. 2: DETERMINING POSITION OF SPRINGLATCH PLUNGER
SPRINGLATCH
MEASURE GAP
BETWEEN
SPRINGLATCH AND
DEADLATCH PIN
DEADLATCH PIN
(MAY BE ABOVE)
GAP BETWEEN
DOOR AND FRAME
SPRINGLATCH
PLUNGER
2.4.2 ADJUSTING SPRINGLATCH POSITION
Now that you have marked the unit with the correct position for the springlatch plunger, the
actual adjustment must be performed. Figure 3 shows the procedure.
GREATER THAN 1/4" GAP
DRAW LINES ON MORTISE
UNLATCH DENOTING TOP
AND BOTTOM OF SPRINGLATCH
CURVED LIP OF
MORTISE UNLATCH
LESS THAN 1/4" GAP
WHEN THE GAP BETWEEN THE SPRINGLATCH AND DEADLATCH PIN
IS LESS THAN 1/4", SET THE BOTTOM EDGE OF THE SPRINGLATCH
PLUNGER MIDWAY BETWEEN THE SPRINGLATCH AND DEADLATCH
PIN. (NOTE THAT THE DEADLATCH PIN MAY BE BELOW THE
SPRINGLATCH AS IN THIS EXAMPLE, OR ABOVE IT)
SPRINGLATCH BOTTOM EDGE (EXAMPLE)
DEADLATCH PIN TOP EDGE (EXAMPLE)
MIDWAY POSITION
EXAMPLE OF SPRINGLATCH
PLUNGER CENTERED WITH
RESPECT TO SPRINGLATCH
POSITION (SHOWN BY
DRAWN LINES). THE PLUNGER
SHOULD BE CENTERED WHEN
THE GAP BETWEEN THE
SPRINGLATCH AND DEADLATCH
PIN IS GREATER THAN 1/4"
Page- 3
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