GB240334A - Improvements in or relating to key locks - Google Patents

Abstract

240,334. Ralls, J. C. Dec. 17, 1924. Keys; locks, wards for; padlocks.-The key of a lock operated by cylindrical key with a pivoted bit is formed with the end of the bit pointed, bevelled or rounded so that the flat interior of the casing or other flat surface within the lock can cause the bit to assume its operative position when inserted. The key may be double bitted. Various forms of the key are shown in Fig. 7. The shank A has an axial slot B in which the bit C is pivoted at C<1>. The bit is shaped so that its point C<2> is on one side of the axial line through the pivot C<1> so that pressure of this end on a flat surface causes the bit to assume a position at right-angles to the shank. The padlock shown in Figs. 1<A> and 1<B> is operated by a double-bitted key such as Nos. 1 and 2 of Fig. 7, the boss F being cut away at D to allow the bit to move to operative position and a semi-circular ward H being provided. In the padlock shown in Fig. 2, a flat boss J inside the casing turns the bit and an axial groove A' leading to a circumferential groove A<2> in the stem co-oparates with an additional ward pin N. Several of such pins and grooves may be provided. The padlock shown in Fig. 3 is provided with a part J on the shackle L for turning the bit.