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The history of the bar puller begins with the introduction of the NC/CNC lathes in around 1980. At this time lathes were changed to permit inexpensive and economical production of small or medium-sized batches. The bar puller serves to draw bars into the lathe without operators having to feed the machine with material each time it is required.
In the case of the French stretcher, a mitre joint is used to adhere the corners. "Keys" or small triangle wedges are inserted in the joint after stretching the canvas to give the canvas its final tension. When fastening the canvas, pressure should be distributed evenly around the stretcher to minimize warping due to unequal distribution of pull.
Most stretcher frames have eight keys, two in each corner. [1] Each key is tapped in to expand the stretcher bars slightly, tensioning the canvas. [1] [2] The keys can be used to re-tighten the canvas as it relaxes naturally over time. [5] If the key is tapped too forcefully, it may tear the side of the canvas. [4]
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Strainer bar frames are usually in the shape of a rectangle, although shaped canvases are also possible. [1] A stretcher frame constructed from strainer bars should not be confused with one constructed from stretcher bars. Strainer bars are fixed to one another with wood glue, nails or staples, often in conjunction.
A Budweiser branded "bar blade", front and back. The speed opener is a flat blade of steel approximately 4 cm wide and 16 cm long with a thumb hole at one end and a letterbox cut at the other to remove the crown seals from a bottle. They go under the names 'speed opener', 'popper', 'mamba', 'bar key', and most popularly 'bar blade'.
The peg type casement stay has one or two pins or pegs inside the rebate. The stay is a metal bar with holes that fit onto the peg, and allow the sash window to be held open in various positions. The peg nearest the hinge can then be used as a fulcrum. Disadvantages of peg type stays are that the stay handle may protrude dangerously into the room.
This pin is usually attached to the stretcher with a short chain or string. [2] Using chain avoids the inconvenient twisting tendency of string. In use, the grooved edge is located over a convenient edge of the frame to act as the fulcrum of a lever and the stretcher is levered outwards. As the handle is further away from the fulcrum than the ...
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