Patent GB-190320838-A (GB)
Title: Improvements in or relating to Fire Alarm and Signalling Systems.
Inventor: WOOLLEY LEONIDAS GORHAM
Filed: 1903-09-28
Granted: 1904-06-23
Abstract: 20,838. Woolley, L. G., and Cooney, A. C. Sept. 28. Alarm apparatus for fire use. The indicating and signalling devices of the central-station apparatus of a fire-alarm system are thrown into gear with operating cam - wheels, and a spring motor for operating these cam-wheels is started, by means of electromotors connected to the alarm circuits, these circuits being automatically broken while the spring motor rotates. The spring motor 11, Fig. 1, is connected through spur gearing 34<a>, 34 with the sbaft 35 carrying the cam-wheels 40, Fig. 5, and through additional gearing 71, 72, 73, Fig. 1, with a governor 80, and is normally prevented from rotating by a lever 66 on a shaft 65 engaging with a lug 88<a>, Fig. 10, on a disc 87 held against a disc 85 on the governor shaft 76 by a spiral spring 89. The governor is provided with hinged weighted elements 78, Fig. 1, held in their normal position by springs and acting on a slidable sleeve carrying a flywheel 82, so that the latter is forced against a disc 83 on a shaft 84 when the speed abnormally increases. Spring pawls 98, 99, Fig. 5, carried by the armature shaft 96 of each motor, engage with a ratchet-disc 54, and a forked pawl 42, pivoted to a balanced pivoted lever 48, is normally held out of engagement with the corresponding cam-wheel 40 by a friction roller 54<b> on the disc 54. On sending a current through one of the electromotors, the rotation of the corresponding disc 54 allows the corresponding pawl 42 to engage with its cam-wheel 40, a lug on the disc 54, by striking against a spring arm 52 on a shaft 50 connected through a crank 62, Fig. 2, a rod 61, and a crank 27 with a latch 28, disengages the latch 28 from a pivoted weight 21 and allows the weight to fall. A stud on the weight then strikes against an arm 69 on the shaft 65 and releases the spring motor. In the normal position, contacts 121, 123, Fig. 13, connected to the alarm circuits are closed by insulated springs 120<b> carried by a lever 120 on a shaft 117, on which is another lever 118, Fig. 2, resting against a cam 119 on the motor casing. As the motor rotates, the cam escapes from the lever 118 and allows the contacts 121, 123 to separate, so that all the alarm circuits are broken. The vibration of the operative pawl 42, Fig. 5, and the consequent rocking of the arm 48 operate an audible alarm, and a finger 106<d> on the pawl 42, by engaging under a pivoted lever 106 carrying the number-indicating plates 107, simultaneously raises the plates 107, until projections 111 thereon engage above wing-pieces 104<b> formed in one with a pivoted piece 104. Slots in the levers 106 allow the fingers 106<d> ofinoperative pawls to pass through. During the rotation of the spring motor, a log 30, Fig. 2, on its casing engages with a wing 23 on the weight 21, and raises it against a atop 130. When the motor has nearly completed a revolution, the latch 28 is forced into its normal position by the lug 30 engaging a lever 55 on the shaft 50, and an arm on the shaft 50 disengages the pawls 98, 99 from the ratchet-disc 54, which is then returned to its normal position by a weighted lever. The further rotation of the motor causes a lug 33, Fig. 2, to raise the weight 21, by means of a pivoted piece 31, 32, into the normal position, and the cam 119 to close the contacts 121, 123, after which a lug 68 on the motor casing, by acting on a spring arm 67 on the shaft 65, stops the motor. The indicator drops are released by swinging a rod 113, Fig. 5, carried by clamps on a parallel shaft 112, against the lower ends of the pieces 104<c>.