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We can supply several different types of door knobs, all doing the same job, but their actions differ slightly, here we've produced a simple guide, to make your decisions easier.
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Mortice knob
This knob is to be used with the mortice door lock . The lock is situated in the center of the door with equal width either side as shown in the picture to the left.
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Rim knob
This knob is to be used when the type of door lock as the old fashion bolt on metal case lock on the outside of the door. With one knob having a rose and the other one doesn't, because it fits on to the metal case |
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Centre knob
This knob is to be used when you don't have to use a turning action on the knob to open the door, suitable for a roller ball latch requirement, simple pull and push action of the door. |
Turn and release
This system is used mainly in the bathroom, it's a quick way to operate a deadbolt lock system with no keys, just a turn of the thumb will lock an unlock. |
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Most knobs will offer two versions of the rose fixings which are
Concealed fix
The rose of the knob covers the screws, making a nice clean finish.
Face fix
When the rose of the knob has the screw holes in it, and you see the screws when the knob is attached. |
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Some doors have slightly tighter latch mechanics, this means greater force is needed to open the latch. If the door is used daily by elderly people or small children a lever type would be more appropriate due to the grip levels being slightly less.
Be aware of where the knob is being situated, too close to the edge and you may scrape your knuckles on the edge of the door frame.
If this is a problem go for a lever style handle or a center door knob. Brass, copper and silver are great finishes which are extremely good at disinfecting themselves. Brass, Copper and silver do this due to the oligodynamic effect. Ions in the metal are poisonous to the germs we carry.
http://en.wikipedia.org/wiki/Door_knob
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