691,199. Clocks. ETABLISSEMENTS JAPY FRERES. July 24, 1950 [Oct. 13, 1949]. No. 18454/50. Class 139. An alarm clock having a clockwork mechanism associated with an alarm movement in which the dial indicators, the clockwork mechanism and the alarm movement are controllable by means accessible from the outside, is characterized in that an additional alarm control device which is provided with an indicator and which controls the alarm hammer and releases it to sound the alarm at the end of an indicated pre-set. time period is adapted to be coupled with said clockwork mechanism by means of a control member accessible from the outside, said additional alarm control device cooperating with a rocking member provided with two arms one or other of which locks and duly releases the anchor of the alarm movement, according as the additional alarm device is coupled with or uncoupled from said clockwork mechanism. In a first embodiment, Fig. 1, the minute wheel pinion 4 drives a wheel 8 carrying the usual alarm cam 9 which co-operates with a pin 12 on the spindle 10 settable by a knob 11. The cam 9 is pressed against the pin 12 by the resilient arm 38c of a three armed lever 38 pivoted at 38a. The arm 38c normally engages the end 19a of a lever 19 on the spindle 15 of the alarm anchor 16 to prevent oscillation of the hammer 17, 18. 'The arm 38 of the lever 38, 38b, 38c co-operates with three pins 37 on a mutilated gear wheel 22 mounted on a shaft 23 also carrying a mutilated gear 24. The gear wheel 22 meshes with a pinion 26 on a shaft 27 rotatable against a spring 30 by a knob 28. The arrangement is such that rotation of the knob 28 in the direction of the arrow 43 is transmitted via the mutilated gear 24 to a pinion 33 which is carried by a sleeve 34 on which a pointer 35 is mounted. The pointer 35 may be set to a desired time interval on an associated scale. During the setting movement of the knob 28 the mutilated gear 22 has been moved so that the pins 37 rock the three armed lever 38, 38b, 38c against the pressure of a spring 41, the lever arm 38c leaves the extension 19a of the lever 19 but this lever is immediately locked by the arm 38b. A gear 20 frictionally mounted on the minute spindle 1 then drives the pointer 35 back to zero through the gears 22, 24 and 33, the main spring being assisted by the spring 30 during this movement. The lever 38, 38a, 38b is moved slowly in the direction of the arrow 42. When the pointer 35 reaches zero the lever 19 is freed from the lever arm 38b and the hammer 17, 18 is oscillated to sound the alarm until the lever 19 is arrested by the lever arm 38c. In another embodiment, Fig. 2 (not shown), the mutilated gear 22 is replaced by a gear freely rotatable on a shaft for setting purposes but frictionally clutched thereto when rotated by the cannon pinion. The pins 37 are replaced by a cam. In a modification of the first embodiment, Fig. 3 (not shown), the three armed lever does not act directly on the alarm cam 9 but through the intermediary of a resilient lever.