door frame
TRANSCRIPT
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A door frame consists of three members; two upright posts secured at the top with cross piece called the head.
The nominal sizes are 100x75mm and 125x75mm
The head and the posts are joined together by a tenon & mortise joint the variations of which are:-1. Closed mortise and tenon joint.2. Haunched Mortise and tenon.3. Draw pinned slot mortise and
tenon joint.4. Double tenon.
A DOOR FRAME
![Page 2: Door frame](https://reader031.vdocuments.us/reader031/viewer/2022021500/58d0e0321a28ab47238b71dd/html5/thumbnails/2.jpg)
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Proportions of a tenon:-1. Thickness of tenon
should be 1/3 that of the member.
2. Width of tenon should not exceed 5 times the thickness or a maximum of 125mm whichever is less.
Wide tenons should be avoided because:-
1. Shrinkage can cause wedges to become loose.
2. May bend when wedges are inserted splitting the mortice.
3. Require long morticeswhich will weaken the joint.
![Page 4: Door frame](https://reader031.vdocuments.us/reader031/viewer/2022021500/58d0e0321a28ab47238b71dd/html5/thumbnails/4.jpg)
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