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In addition to the mortice locks that are fitted to the front and back door, it is advisable that a pair of bolts are also fitted to each door. These can either be the surface mounted type, or two of which are known as 'Rack Bolts', or Mortice Bolts. Mortice bolts are similar to mortice locks in as much as they are fitted into the door rather than onto it, with a hole also bored into the inside face of the door as a keyhole. A hole will also be required in the door frame ready to receive and hold the bolt when the door is closed, and to make things more secure, the hole is reinforced and protected by a metal plate that will need to be recessed into the frame. |
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The ideal position for the bolts would be about 150mm from the top, with the other about 200mm from the bottom so as to avoid the tenons of the door. The reason why these bolts are important is that they compensate for the fact that there is no locking device at these points, where the door could be pushed in at either the top or bottom, where a bar could be inserted.
The first step in fitting is to mark the position of the upper bolt onto the door edge, which is approximately 150mm from the top, and by |
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using a square, draw a short horizontal line at this point.Then, using a marking gauge, which has been set to half the thickness of the door, score a vertical line crossing through the horizontal as shown in 'fig 2'. The door is now marked with the centre position where the bolt hole will be bored.
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From this mark, use a square to transfer this position to the face of the door, and draw a second horizontal line, at the approximate position of the keyhole.
The next stage is to bore the hole to accommodate the bolt at the position where the two lines cross on the door edge. This hole would normally be 16mm in diameter, and deep enough to allow the bolt and front plate to be recessed. While drilling, ensure that the drill is always held at 'right angles' both vertically and horizontally to the door.
When the bolt hole has been bored out, the next step is to bore a second hole into the inside face of the door, the keyhole. |
| To do this, first measure the distance from the faceplate of the bolt to the centre of the keyhole, and using a combination square or marking gauge, draw a vertical line at this distance from the edge of the door, so that it crosses the horizontal line drawn previously on the inside face. |
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