How do they fit together and work? Knobbs door knob sets are supplied with 8mm standard square spindles. Most locks and latches have 8mm by 8mm followers – the square hole through which the spindle passes. One end of the spindle is glued with two-part epoxy resin into one knob whilst the other end screws into a threaded metal insert glued into the other knob. A grub screw stops this knob from unscrewing off the spindle and this is known as the Pitts Mortice System. Each knob fits into a wooden or solid brass rose (plated finishes are also available) which is fixed to the door with screws. All necessary fixings are supplied including screws and allan key.
There are basically two methods for holding doors closed:
a) Mortice locks or latches – these fit into a recess in the side of the door and so are hidden from view with the door closed. The door knobs required to operate these locks/latches are called MORTICE sets and come supplied with two roses – one for each side of the door. Doors normally range in thickness from 35 to 60 mm and Knobbs mortice sets are designed to accommodate these different thicknesses. We always assume that you require mortice sets unless advised that you have RIMLOCKS on your doors.
b) Rimlocks – these locks are planted on one side of the door and the combined thickness of door and lock is normally at least 60mm. To allow for the increased thickness Knobbs fit longer spindles on rimlock door knob sets and only supply one rose, as the knob which fits against the rimlock does not need one. Although originally fitted to older doors there are still many rimlocks in existence and even new ones are being produced.
We’ll include some fitting instructions with your new door knobs. TIP: May we suggest you put an old pillow on the floor when fitting your door knobs – that way if one of them happens to drop on the floor it won’t get damaged!
*Our door knobs are not mass produced imports – we make them ourselves in our workshop in rural Pembrokeshire*