Patent GB-190217411-A (GB)
Title: Improvements relating to Signalling Apparatus Chiefly Designed for use in connection with Ships.
Inventor: LAKE HENRY HARRIS
Filed: 1902-08-07
Granted: 1902-11-20
Abstract: 17,411. Lake, H. H., [Detroit Electric Signal Co.]. Aug. 7. Signals, electric, indicator or visible, and bell.- Relates to electric signalling-apparatus, chiefly designed for use on ships for signalling from the pilot-house or bridge to the engine-room. The signal is shown on an indicating-dial by a pointer, which is moved with a progressive or step-by-step movement to the desired indication, and is returned to its initial position prior to the transmission of another signal. The movement of the pointer is controlled by the electromagnet R, Figs. 1 and 3, and its return by the electromagnet Z. The indicators A<2> at the transmit- ting and receiving stations are connected as shown in Fig. 1. The magnets R are in the normally - closed circuit Q, in- cluding the single-stroke bells A<3>, and the magnets Z are in the normally-closed circuit Y, the transmission of the signal and the return of the pointer being effected by opening the respective circuits at the switches S, Z<1>. When the magnet R is de - energized, it releases its armature U, Fig. 3, and permits the lever M, 0, which has a spring connection with the armature, to be operated by the spring W. The lever M under the action of this spring rocks the shaft C, and releases the anchor H from an escapement- wheel on the pointer spindle E, which is then rotated, through the space of one tooth, by the weighted toothed segment J actuating the pinion I on the spindle. Further movement of the pointer is effected, in the same manner, by alternately closing and opening the switches S. When the nagnet Z is de-energized, its armature A', under the influence of a spring, engages the extension L of the segment J, and returns the segment and pointer to their initial positions. The switches S, Z' are operated by the same rod T, Figs. 1 and 7. The rod T is provided with a head E', and is capable of both rotary and longitudinal movements, these move- ments opening the switches Z<1>, S respectively. During the rotary movement, the extension e of the head actuates the trigger J<1>, and causes it to open the switch Z<1>, thereby effecting the re-setting of the pointer. The stop-pin G', by engaging the head E', prevents the longitudinal movement until the rod has been rotated sufficiently to bring the hole H<1> on the head into alignment with the stop-pin, thus ensuring the re-setting of the pointer before a signal can be sent. When the extension e passes clear of the trigger J<1>, the switch Z' is closed again by the spring f. The switch S is carried by a disc h, which is mounted on a rod i and engaged in a groove in the head E', the opening of the switch being effected by raising the rod T. When the rod T is released after transmitting a signal, it is depressed by the spring F<1> until the head is disengaged from the stop-pin G', and is then rotated by the spring to its normal position. In a modified arrangement of the circuits, the bells are operated continuously so long as the signal circuit is open. The apparatus may also be arranged in normally-open circuit, and an earth return may be substituted for the return wire shown.