6. The bevel of a lock is a term used both with mortise and rim locks to indicate the direction in which the bevel of the latch bolt is inclined. If inclined outwards, as for doors opening inwards, it is a regular bevel bolt; if inclined inwards, as for doors opening outwards, it is a reverse bevel bolt (except as to cabinet locks, which, being commonly used on doors opening outwards, are regularly made with reverse bevel bolts, unless otherwise specified).
Mortise locks used with double doors having either rabbeted or astragal joints, must have fronts of corresponding sectional form. To avoid the extra cost of special patterns, the edges, or joints, of such doors should conform to established lock standards. The standard rabbet, or step, in the edge of doors is ½ inch, and the standard astragal joint has a ¾-inch bead.
The proper bevel of a door, if any is needed, is determined by the size of butt and the width of the door, as shown in [Fig. 137]. The inner corner of the door travels on a radius with the center at the center of the pin of the butt, and must have a clearance to swing free of the jamb casing. This may be obtained by beveling the edge of the door, or, if its edge is left square, by leaving sufficient clearance between the door and its jamb. If the door is of fair width and the butt does not need to be very wide to clear the trim, it will be found that a square edge may be used without resorting to an unduly open joint, thus permitting the use of locks with regular front; that is, not beveled.
Fig. 137
SHUTTER HARDWARE
97. Shutter Fasteners, or Adjusters.—The most convenient fastener for shutters, or blinds, is the Zimmerman, or Walling, type, as shown in [Fig. 138]. These fasteners or adjusters secure the shutter in the closed, the open, and several intermediate positions, and are made both japanned and galvanized. They can be used with all styles of hinges, although they are generally combined with regular butts or with the New York blind hinge.
Fig. 138
