GB157882A - Improvements relating to safety locks - Google Patents

Abstract

157,882. AbbÚ, J. Jan. 19, 1920, [Convention date]. Locks, revolving-barrel.-The blocking-elements of a revolving-barrel lock are constituted by a series of discs b, which on axial insertion of the key are angularly adjusted so as to permit the cylinder to be pressed in axially and make connection with the bolt-operating means. Two toothed bars e are fitted within the casing c, Fig. 1, in such a way that the teeth f on one bar are opposite the notches in the other. Each tooth acts as a stop to limit the rotation of that disc b which is in its own plane, and also blocks the disc lying in front of it against being pushed in until it has been properly arranged by the key to align the notch j, Fig. 12. The discs are connected in pairs by spiral springs which disarrange them when the key is withdrawn. As shown in Fig. 12, they are formed with an opening having a face r working in conjunction with a key, Fig. 5, having the section shown in Fig. 6, but in which the inclination of the part q varies according to the position along the axis at which the section is taken. When the key is fully inserted, all the .discs are so arranged that the notches are aligned with the teeth f lying behind them, and the inner cylinder, together with the discs, can be pressed inwards. This movement releases projections upon the rear end of the inner cylinder from engagement with the outer case, and enables the inner cylinder to turn, and actuate the bolt-operating connection p. In a modification, the key has a sinuous groove formed upon its surface to engage with projctions upon the discs b so as to set them in the necessary position.