Surprise

Surprise gearboxes are available in 35mm or 45mm backset with a single spindle mechanism.

Single spindles are sprung and can only be used as a lift lever function.

Surprise gearboxes measure 228mm high by backset +15mm. The latch measures 30mm high, as does the deadbolt. There is 65mm between the bottom of the latch and the top of the deadbolt.

Gearboxes are fitted to faceplates with 3 screw holes. The top to middle screw hole measures 109mm and the middle to bottom also measures 109mm.

Earlier versions of these gearboxes also had a small spindle hole at the top of the case, near to the latch. This was used to hold the latch back.

Operation: Lift Lever

Latch reversal: Undo the screw in the latch to remove. Reverse and reinsert then replace screw.

To lock the door

1. Lift the handle upwards to engage the locking points.

2. Lock the locking points and main deadbolt (if present) by turning the key.

To unlock the door

1. Unlock the system by turning the key.

2. Push the handle downwards to disengage the locking points and retract the latch.