Ingenious Half drop Window Mechanism
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Explanatory drawing showing details of construction of the new Young window.
THE essential features of any particular component which is intended for operation by the general public are simplicity, ease of action and robust construction, making for a minimum of maintenance. This applies with particular emphasis to window fittings and, in its new F3-type half-drop window, Messrs. Young Windows. Claydon Works, Wishaw, Scotland, have a design which is at once simple and efficient. It is of the single-control, constant-balance type, the actuating mechanism being arranged in a tube at the top of the window. This tube is bracketed to side members to form a unit for screwing into the window opening in the body of the vehicle.
The balance consists of a case-hardened spindle on which a spiral groove, of inconstant pitch, is cut. Surrounding this spindle, and forming a sliding fit in the main tube, is a sleeve enclosing a hardened steel ball, which is arranged to run freely in the spiral groove. A compression spring is arranged to bear on the sleeve and this forms a control, preventing the window moving under its own weight. There are also a ball thrust and a drum on which is coiled the stainless steel bands which are attached to the window supporting slides.
The action is not difficult to follow. When the 'grip is moved down, the suspension bands rotate the shaft, the sliding-sleeve being caused to move to the right through
the action of the ball in the groove. The farther the window is drawn down, the greater the compression on the spring. Were the groove in the spindle of constant pitch, the spring would force the sleeve back, but as the pitch decreases, the farther the ball moves to the right the increased effort actually produces a locking action. Quite moderate pressure, however, allows the window to be moved as desired, although, as wHI be appreciated, it will stay positively in any position.