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Transcript of 05-Residential Locks
Study Unit 5
PreviewCongratulations on successfully completing another study unit! Youre closer than ever now to your career goal. Youve completed four study units that introduced you to a wide variety of important locksmithing topics. Now, in this study unit, youll continue your studies by examining residential locks. Residential locks are simply any locks that are used in homes (as opposed to commercial businesses). Well focus our attention primarily on the standard door and window locks youll see every day as a locksmith. Residential locks make up a substantial portion of the average locksmiths daily work. Youll learn about the construction, operation, and installation of a variety of door locking systems. When you complete this study unit, youll be able to
Define residential door construction, and the various types of residential doors Describe residential window construction, and the various types of residential windows Explain and demonstrate how a key-in-knob lock works Disassemble and reassemble a key-in-knob lock Explain the difference between interior and exterior locksets Describe how a variety of door and window locking devices are installed Explain what handlesets are, and how they operate Discuss auxiliary locks and latches Define what a deadlock is, how it works, and the names of its parts
ContentsRESIDENTIAL DOORS . . . . . . . . . . . . . . . . . . . . . . .Introduction Residential Door Construction Door Installation Door Types Door Hardware The Hand of a Door Door Bevel
RESIDENTIAL LOCKS . . . . . . . . . . . . . . . . . . . . . . . 22Locksets Entrance Handlesets Auxiliary Door Locks and Latches Disassembling a Key-in-Knob Lockset Disassembling a Handleset Disassembling a Dead Bolt Lock Installing a Residential Lockset Replacing One Lockset With Another Servicing a Lockset
WINDOWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Major Window Styles Glazing Window Locks Installing a Window Bolt
THE KEY TO SUCCESS . . . . . . . . . . . . . . . . . . . . . . . 67 KEY POINTS TO REMEMBER . . . . . . . . . . . . . . . . . . . . 67 LOCKING IT UP! ANSWERS . . . . . . . . . . . . . . . . . . . . 73 EXAMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . 75 COMING ATTRACTIONS . . . . . . . . . . . . . . . . . . . . . 79
Do You Know . . .What is a flush door? What is a key-in-knob lockset? What is an entrance handleset?
In this study unit, youll find the answers to these and many other questions about residential locks.
IntroductionAs youve learned from earlier study units, people use locks to secure everything from their baggage to their bicycles. The most important use of locks, however, is to lock residential doors and, to a lesser degree, windows. This study unit will focus on how locks are used for home security. First, well examine the construction of doors and windows. While a locksmith isnt expected to have all the knowledge of a carpenter or home builder, you should have a general idea of how doors and windows are put together and how locks can be installed on them. Understanding the construction of doors and windows also helps you see where their weak points are. Finally, being familiar with the different popular styles of doors and windows will help you to determine what locks should be used in a particular situation. Now, lets look at the construction of a typical modern door.
Residential Door ConstructionA residential door functions as the entry to a home, and also provides security for the homes occupants and their belongings. While the exterior appearance of residential doors has remained much the same over the past 100 years, the interior construction has changed greatly. Two factors have led to improvements in door construction: rising crime rates and the need to conserve energy. For this reason, door manufacturers have greatly improved the design of their products to keep intruders out and heat in. Modern doors may contain a solid wood core (or an insulated rigid foam core), plastic or rubber thermal sheeting, and a fiberglass or metal shell. All of these features can add security and energy efficiency to the construction. If glass is used in the door at all, its the insulated thermal type. Modern insulated doors dont require a storm door and are popular in all climates and regions. The individual parts used to construct a door vary according to the style of the door. Well discuss different door styles in a moment. Now, however, lets take a look at how a door is installed in a home.
Door InstallationThe installation of a door is relatively simple. If you were to look at a house as it was being built, you would see the wall frame as shown in Figure 1. An opening is left in the wall frame for the door to be installed in later. A door is typically installed in a doorjamb. A doorjamb is simply the wooden door frame that fits into the space in the wall. A doorjamb consists of two side jambs and a head jamb across the top. Also, most exterior doors contain a sill at the bottom to prevent leaks and drafts. A door stop is a thin vertical strip of metal or wood nailed or screwed to the jamb to prevent the door from swinging through the opening. Todays contractor or home improver can purchase prefabricated pre-hung doors (doors already encased in their jambs). Pre-hung doors are ready to be installed. The door and jamb unit is simply placed into the wall cavity.
FIGURE 1This illustration shows how a door is installed in a wall frame. Note all the parts of the door labeled in the figure.
Home security is an important concern in the installation of any door. The following are four important security factors to be considered when installing a door: Door Construction. The first concern, door construction, refers to how strong the door is. The strength of a doors structure will relate directly to the amount of security the door can provide. Hardware. The hardware used in installing a door (including hinges, knobs, latches, and so on) must be strong enough to withstand attack. Door hardware, like door construction, will directly affect the security of any door. Locks. Locks must be strong enough in construction to withstand physical attacks, and their mechanisms must be complex enough to prevent unwanted entry.
Visibility. A door should provide proper visibility through the use of door viewers and/or sidelights so that occupants can view visitors before allowing them to enter the home.
Door TypesNow, lets examine some of the most popular door styles. The following are descriptions of some of the most popular door types.
Flush DoorsA flush door (Figure 2) is a smooth wooden door thats usually composed of a hardwood veneer panel over either a solid or a hollow core. (A veneer is simply a very thin sheet of wood used as decoration on the outside of a door.) A solid core is usually constructed of wooden blocks or a rigid composition slab. A hollow core is made from wooden or cardboard strips laid on edge to form a sort of honeycomb inside the door. The outer veneer panels are glued securely over the core. Some inexpensive flush doors have panels made of pine or other soft woods, or even textured hardboard. In contrast, flush doors containing embossed steel panels are considered to be high-quality installations. These steel doors are often required in apartment buildings or other multifamily dwellings to meet fire code regulations. Steel doors are also preferred by many homeowners living in high-crime neighborhoods. Note that solid-core doors are better for exterior use; hollow- core doors are more appropriate for use indoors. If a hollow-core door is used on an exterior opening, a waterproof adhesive must be attached to the veneer panels.
FIGURE 2Flush Door
FIGURE 3Panel Door
Panel DoorsPanel doors, also called stile-and-rail doors, are composed of four or more interlocking components positioned around one or more central panels (Figure 3). The vertical components are called the stiles, and the horizontal components are the rails. These doors are available in a wide range of woods and designs. Since there are several joints in a panel door, its security and insulating properties arent as good as those of a flush door. Panel doors are often used as exterior doors in homes when architectural beauty is of more concern than security. A Dutch door (Figure 4) is a panel door thats been divided in half horizontally. The upper half can be opened for fresh air while the bottom half remains closed and locked. Each of the two halves must be properly hinged.
French DoorsThe French door (Figure 5) is a variation of the panel door. A French door has
FIGURE 4Dutch Door
FIGURE 5French Door
stile and rail components, but instead of flat wooden panels in between the stiles and rails, French doors contain panes of glass. For this reason, the French door is especially vulnerable to an intruders attack. Youll often see French doors leading onto patios, porches, and balconies. Old-fashioned French doors contained separate panes of glass. However, many modern French doors are now constructed to hold a large single sheet of insulated glass. The appearance of separate panes is then achieved by inserting snap-in grids over the glass.
Sliding Glass DoorsA sliding glass door (Figure 6) contains a large pane of glass inserted in a wooden or metal frame. The door opens and closes by sliding on tracks. Sliding doors usually contain two panels. One panel slides in both directions, while the oth