GB191124284A - Improvements in and relating to Keyless Clocks. - Google Patents

Abstract

24,284. Phinney, F. Nov. 1. Keyless mechanism.-In a keyless clock of the kind in which winding and hand-setting are effected by rotating the bezel or rim, the bezel 8 is attached to a slidable inner casing 7, which is provided with an annular wheel 9 gearing with a wheel 16 on the mainspring arbor when the casing 7 is pushed in, and with a setting- wheel, loose on the hub of the wheel 16, when the casing is pulled out. In the arrangement shown in Fig. 1, the setting-wheel 21 is geared to a wheel 29 on the centre arbor by wheels 24, 28, both fixed on an arbor 25, which passes through slots 27 in the frame-plates 11. 12, and which is controlled by a flat spring 30. An annular projection 33 on the casing 7 rests in a notch 31 in the spring when the casing is in the position for winding. On pulling out the casing, the arbor 25 is shifted by pressure of the projection 33 against the spring, Fig. 5, the wheels 28, 29 being then thrown into gear. Figs. 4<a> and 2<a> show a modification in which the setting- wheel 19 is geared to a wheel 22, supported by a plate 23, the wheel 22 being integral with a clutch-member 24 through which the centre arbor 15 passes. When the inner casing 7 is pulled out, a spring-pressed lever 26, operated by the ring 9, throws a sleeve 25, mounted on a squared part of the arbor 15, into engagement with the clutch 24. To hold the casing 7 in the required positions, the ring 9 is connected to a bridge 29, having notched pins 31 engaging with split tubes 33 fixed to the frame-plate 11. Stop-mechanism.-Keyless clocks of the kind described may be provided with stop-mechanism. In the arrangement shown in Figs. 3<b> and 1<b>, a centre-seconds hand 30 is started, stopped, and zeroized by successive depressions of the clock-glass 58, the bezel 57 being so mounted that it can be pushed inwardly, and having a projection 56 which acts upon a push-pin 54 adapted to move a ratchet-wheel 52 step by step. This wheel is geared to a notched camwheel 45, on the edge of which two spring- controlled levers 41, 60 rest, Fig. 1<b>. The lever 41 carries a wheel 40 which is always in gear with a wheel 43, rotating once a minute, and, when the end 47 of the lever rests in one of the notches in the cam-wheel, the wheel 40 drives the seconds arbor 37 by gearing with a wheel 39 thereon. The lever 60 is adapted to act upon a heart-cam 64 on the seconds arbor, to return the hand to zero. Clock movements.-In the arrangement shown in Figs. 4<b> and 3<b>, a wheel 17 on the barrel gears with a pinion 18. which, together with a wheel 19, is friction-tight on an arbor 20. A pinion 21 and whee] 22 are friction-tight on the centre arbor 15, which has a bearing in the top plate 23, the pinion 21 gearing with the wheel 19, and the wheel 22 being geared to the escapement by a suitable train. The arbor 20 drives the minute and hour hands by means of wheels 24, 28 gearing with a pinion and wheel 25, 29 mounted on sleeves 26, 30 to which the hands are attached. Wheels 33, 34, fast on the arbors 15, 20 respectively, are provided for the purpose of setting the hands.