When gravity hinges are used, the only fastening required is a catch to secure the blind when closed. Fig. 445 shows the catch sold with the hinge, Fig. 443, which, although very simple, works nicely. The catch is screwed to the inside of the bot-
Fig. 444, -Ideal Blind Hinge.
Fig. 445 torn rail of the blind; when the blind is closed, the plate A, catches automatically over a staple driven into the sill. Fig. 446 shows an improved catch made by the same firm, which works on the same principle, but cannot be as easily opened from the outside. There are several other catches quite similar to these.
For blinds hung with hinges similar to those shown in Figs. 441 and 442, it is necessary to use a catch that will secure the blind either when open or when closed. Most of the catches for securing the blind in both positions are made to go underneath the blind; there are a great many patterns, but as a rule, the simplest catch is the most satisfactory. The catch shown in Fig. 447 is very much used in New England, and gives general satisfaction. The end of the wire is screwed into the bottom of the blind, and the staple S, is also driven into the blind. The hook H, is driven into the window sill and engages the fast when the blind is closed. The back catch is driven into the wall to engage the fast when the blind is thrown back.
Underneath catches can, of course, only be used when there is a space of at least 5/8-inch between the blind and the sill. If the blind fits into a rebate in the sill, as in Fig. 96, a mortise blind fast, or one
Fig. 447. - Stanley's Wire Blind Fast made to screw through the blind, must be used. Fig. 448 shows Hyde's patent gravity blind fast, which is made to drive through a hole bored through the bottom rail. It has double lock levers, and the inner one cannot be operated from the outside when the blind is closed. A common staple is used for the sill catch.
To close a blind hung with the ordinary gravity or hold back hinge, or with a simple hinge and back catch, it is necessary to reach far out of the window to raise the blind bodily or to release the catch. To overcome this difficulty, several devices have been patented which operate either from the hanging stile of the blind or from the sill, and are intended to secure the blind whether open or shut; others adjust the blind to any position and hold it there, while still others are designed to operate the blinds without opening the window. Very few of the devices of the first and second class appear to be used to any extent, but a practical device that will open or close the blind and lock it securely without opening the window, is certainly a very desirable equipment for residences. Several devices that accomplish this purpose have been patented, but the author knows of none that has proved a practical success.
Fig. 448 - Hyde's gravity Lock Blind Put.