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For added security in the home, both 856 and 859 door bolts can be supplied with integral restrictors. When engaged, the use of these products restricts the opening of the door to 100mm, a function achieved traditionally with door chains.
The FUHR door restrictor is engaged and released by turning the small additional thumb turn handle on the inside of the door. In order to open the door to allow entry, the door needs to be closed fully and the restrictor disengaged.
The restrictor mechanism is fully concealed when the door is closed. The FUHR restrictor can be used with individual keeps or as an integral part of a one piece keep.
A Eurogroove is an industry standard feature on most PVCu, aluminium and timber door and window profiles, where the locking devices are fitted.
A Eurogroove is the groove in the profile in which multipoint locks and espagnolettes are fitted. This is always 16mm for PVC, but can be 20mm in Timber.
PAS 24 is an enhanced security performance test for door assembly requirements, every component used within the door set tested must comply to the relevant British Standard for that component.
PAS 24 includes several security tests, such as:
An example of the intensity of the testing, the mechanical loading tests subjects the door set to 4.5Kn of pressure, the equivalent of approximately 45 times the pressure used to tighten a car wheel nut.
Backset
The backset is the dimension from the front of the faceplate to the centre of the handle spindle or cylinder hole.
The most popular backset sizes are 25mm, 30mm, 35mm and 45mm.
The backset dimension is the distance between A and B on the diagram.
PZ Centre
The "PZ" or "Centre" is the distance between the centre of the handle spindle and the centre of the round section of the cylinder.
The PZ Centre dimension is the dimension between C and D on the diagram.
Multipoint locks can have one or two spindle holes (also known as followers) these type of locks will have two measurements, the most popular being 62mm / 92mm.
Most modern locks with one spindle are 92mm centre, however some older locks may be 70mm or 72mm.
On most FUHR locks, to change the handing you remove the small grub screw on the side of the lock case adjacent to the latch plate with a 2mm allen key.
Remove the latch and turn in it 180º vertically, place it back into the opening and secure the grub screw back in place.
The FUHR 871 and FUHR 881 door locks are supplied handed, this cannot be changed, so please ensure you order the correct handing for the application.
Step 1 Unscrew and remove the 3 screws as shown in the video
Step 2 Remove the lockcase
Step 3 Clip the replacement lockcase in place
Step 4 Replace the 3 screws
Hook and Keep alignment:
The hook and keep should be aligned using the guideline on the hook plate. Ensure the hook engages correctly avoiding friction on which can result in damage to the hook, there should be a 2mm gap between the line on the hook plate and the flat of the hook as shown in the diagram.
Latch and hook adjustment:
Take care not to over adjust the hook keep as this can damage the keep - do not rotate through 360º. A screwdriver and a 4mm allen key will be required when adjusting these plates.
Roller and mushroom adjustment:
Adjust eccentric compression of roller and mushroom keeps to ensure the optimum compression for the door. Adjust the compression using a 4mm allen key.
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