Fig. 50
Fig. 51
47. Cabinet Locks.—The locks used in cabinetwork are distinct from builders’ locks, though they are occasionally used in the construction of the finer classes of interior finish, and, consequently, are of interest to the architect. Cabinet locks are made chiefly of wrought metal, and in a vast variety of kinds, sizes, and grades, so that care should be exercised in their selection. The leading kind of cabinet locks are drawer, or till, locks; wardrobe, or cupboard, locks; and chest, box, and desk locks. Special locks are also manufactured for many other purposes. For the best work, the Yale, or pin-tumbler, type is desirable where great security is required, but for ordinary uses, other types, with either flat or round keys are available. Many of the cabinet locks admit of being master-keyed, and such locks are employed on lockers in club rooms, armories, etc.
Fig. 52
48. Asylum and Prison Locks.—For the doors of cells in insane asylums, hospitals, and prisons, locks of special construction are required. For this reason, a distinct class of hardware is manufactured to meet the peculiar conditions that prevail. These locks, which are designed primarily to prevent escape from the rooms, or cells, are exceptionally exposed to attempts at tampering, and are especially constructed to meet these conditions. There is an extensive line of locks for these uses on the market. This line includes both the Yale type and the lever-tumbler type of lock, and these locks are constructed with both solid and barrel keys, thus affording a wide range of selection. All such locks must be made so as to be controlled by master keys.
In [Fig. 52] are illustrated types of prison or asylum locks. The lock shown at (a) is embedded, or built, in the jamb, while that at (b) is secured to the door and the keeper is fastened in the jamb.
