Fig. 95
Fig. 96
77. Casement Adjusters.—In order to hold pivoted or hinged sash in a partly open position, it is necessary to use casement-sash adjusters. These adjusters, and the method of applying them, are illustrated in [Fig. 95]. In this figure is shown the adjuster applied to a sash pivoted at the top and the bottom, but the device can as well be applied to a casement sash hinged at the sides.
There are many forms of casement-sash adjusters, the common types being illustrated in [Fig. 96]. They are arranged for sash that open either inwards or outwards, and may be applied to either pivoted or hinged sash. Most casement-sash adjusters usually consist of a rod or a bar attached to the sash by a hinged or pivoted joint. The rod passes through a clamp on the frame, or sill, and this rod, when the clamp is tightened, holds the sash firmly in any desired position.
78. Window and Shutter Operating Devices.—The sash-operating device is provided for the purpose of controlling a number of sash in a line by one piece of mechanism. Frequently, divided sashes are arranged side by side in skylights, clearstories, and monitors. These windows are usually some distance from the floor, and the operating device must be so arranged that it can be worked conveniently. The device illustrated in [Fig. 97] is known as the Lovell window and shutter operating device, and consists of two longitudinal sections of pipe shafting a connected to cog racks b at the end. These cog racks in turn engage with a cog, or wheel, shaft c, as indicated in the figure. Connecting arms d, with swivel joints at each end, are arranged between the pipe shafts and the sash. The ends connected to the sash are secured to the same by means of plates and wood screws, and the swivel joint at the other end is provided with a sleeve, or socket, that is secured to the pipe shafts with a setscrew. The commendable feature of this device is that it is operated by a straight push or pull of the arm, instead of a twist, as in some other devices on the market. When the chain, or rope, around the large chain wheel is pulled, the cog is turned, and as it engages the racks, it thrusts one pipe horizontally in one direction and the other in an opposite direction. By this means, the connecting arms to the sash approach one another and lengthen the distance between the shafting and the sash, which movement tends to push the sash open, the sash being closed by the opposite operation. By this device as much as 500 feet of sash may be operated by one wheel, or “power,” as it is called. This chain wheel, or power, may be located either in the center or at the terminals, and by careful adjustment will simultaneously close all the sashes tight against the frame.
Fig. 97