Sash windows are correctly called double-hung sashes or box windows and operate with cords, pulleys and weights; these counter-balance both the inner and outer sash, while sliding up and down. One end of the cord is nailed to a groove in the side of the sash, while, the other attaches to a weight, in a hidden shaft within the frame.
The pulley wheels attach to pulley stiles-the upright sides of the frame which hide the weights. Part of each pulley stile consists of a removable section of timber known as a ‘pocket’, which fits flush with the stiles and provides an access hatch to the weights. These pockets are usually screwed into place.
Remove the fixing bead round the inside edge of the window frame carefully. Start in the middle of a long bead by gently prising it away from the main frame by around 25mm. Use an old chisel. Now tap the bead smartly back into place. The pins securing it should pop up through the surface of the wood and can then be removed with pliers.
If this does not prove effective, you can drive a wedge in the middle and use a chisel to lever progressively towards the ends of the bead. Next, remove the parting bead between the sashes, using the chisel to ease it out of its groove.
The lower sash can be taken out and rested on the window sill. Before removing it, mark in pencil on the front of the sash the place where the ends of the sash cords come, and make a corresponding mark on the frame.
Remove thewith a pair of pincers, while holding the sash cords. This prevents the weights at the other end from falling behind the stile boards. The inner sash can be removed next and stood aside. Repeat the marking procedure.
Finally, unscrew or lever out the pocket covers. Take out the weights by pulling them through the pocket openings.
Once the frames are removed, old glass can be taken out, following the techniques in the article on window glazing. All window and door furniture, such as catches, should also be removed.
On tenon joints, remove the wedges in the middle of the joints by drilling a hole in the middle and prise these out with a slim chisel. With dowelled joints, remove the dowels, using a drill of the same diameter as the dowels.
Once the window is taken apart it may appear to be something of a jigsaw. Mark, on each side of each joint, a letter or a number in sequence to make it easy to identify the correct piece when you reassemble the sections.
The joints can be taken apart by holding a piece of timber against the frame and tapping with a mallet. Take care to avoid damaging them. Once apart, use the chisel or a scraper to remove old, or brush the joint with boiling water to soften the . Finally, clean the joint with fine wire wool.
10. November 2011 by admin
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