Surprise gearboxes are designed for versatility and ease of use, available in two backset options: 35mm or 45mm, featuring a single spindle mechanism.
The single spindles are sprung, specifically designed for a lift lever function, ensuring smooth operation.
Dimensions for the Surprise gearboxes are as follows: they measure 228mm in height, with the backset plus an additional 15mm. The latch and deadbolt both measure 30mm in height, with a 65mm distance between the bottom of the latch and the top of the deadbolt.
These gearboxes are compatible with faceplates that have three screw holes. The measurements for the screw holes are 109mm from the top to the middle and 109mm from the middle to the bottom.
Earlier models of these gearboxes included a small spindle hole at the top of the case, adjacent to the latch, which was utilized to hold the latch back.
Operation: Lift Lever
Latch Reversal: To reverse the latch, simply undo the screw in the latch to remove it. Reverse the latch and reinsert it, then replace the screw.
To Lock the Door:
Lift the handle upwards to engage the locking points.
Secure the locking points and main deadbolt (if applicable) by turning the key.
To Unlock the Door:
Unlock the system by turning the key.
Push the handle downwards to disengage the locking points and retract the latch.
Product Specification
Manufacturer: Surprise
Backset: 35mm or 45mm - How do I measure the backset?
