Patent GB-191503420-A (GB)
Title: Improvements in Electric Impulse Transmitters, particularly adapted for Signalling Purposes.
Inventor: STERN ALBERT
IPC: H04M1/31
Filed: 1915-03-03
Abstract: 3420. Stern, A. March 3. Order apparatus.-In an impulse - transmitter designed for controlling an indicator giving stopping and turning signals on motor-cars, but applicable generally, the rotation of a handle, acting through a ratchet gear, tensions a spring for operating the impulsesending mechanism, which is locked by the initial movement of the handle and retained locked until the handle is released. The handle is retained in its set position during the transmission of impulses. The connexion between the spring and the impulse-ending mechanism is such that the handle can be rotated through a complete revolution, so that a signal can be repeated. The impulse-sending mechanism consists of a sleeve 11, Fig. 3, mounted loosely ou the fixed standard 9 and rigidly connected to a pair of disks 13, 14, portions 15 of the disk 14 being turned downwards so as to form a kind of wheel, the parts 15 forming the teeth and serving to operate a pivoted toggle 54, Fig. 2, so as to press the impulse springs 58,59 together. The sleeve 11 is secured to one end of a spring 16, the other end of which is fixed to the spring barrel 17, which can be rotated by the handle 41 by the following mechanism. A sleeve 34, loose on the barrel 17, is connected rigidly with the handle 41 and with an arm 35 having a slot 36, within which is a pin 37 fixed to an arm 38 on a flange 19 of the barrel 17. The arms 35, 38 are also connected by a spring 40, Fig. 2. Rotation of the handle 41 therefore tensions the spring 16 after a slight lost motion due to the pin-and slot connexion 36, 37. In order to lock the impulse-ending disks 13, 14 during the setting of the handle, the disk 13 is formed with ratchet teeth 53, Fig. 2, adapted to be engaged by a pawl 49 on a crank 48 connected to a slot 47 in a member 46 rigidly connected to a sleeve 43 loosely mounted on the sleeve 34. In order to move the sleeve 43 and pawl 49 the necessary amount on the initial movement of the handle 41, the sleeve 43 has secured to it a ratchet disk 44 engaged by a pawl 51 mounted on the arm 35 rigid with the handle 41. During the first movement of the handle, the pawl 51 moves the ratchet disk 44 to lock the impulse-sending mechanism, but during the further movement, the pawl is disengaged from the ratchet, and the movement of the handle tensions the spring 16 as previously described. A spring pawl 28 mounted on the arm 38 engages teeth 32 in au annular member 31, the pawl 28 and teeth 32 being so shaped as to prevent counterclockwise rotation of the arm 38. In order to allow a complete revolution of the handle 41, the spring barrel 17 is connected to the impulse mechanism 13, 14 by a lost-motion device consisti, g of a washer 21, Figs. 4 and 6, arranged between the flange 19 and tne disk 14. An upward lug 25 on the washer engages a cut-away part 26 of the flange, and an extension 23 co-operates with an upward lug 24 on the disk 14. When the spring barrel 17 and arm 38 are rotated by the handle, the washer 21 is displaced, and when the handle is released, the pawl 49 releases the disk 13 so that the sleeve 11 and disks 13, 14 are rotated by the spring 16 until the lug 24 engages the extension 23 on the washer and moves this round until the lug 25 engages the part 54 of the arm 38, thus arresting the movement. The motion of the sleeve 11 &c. is controlled by an escapement device consisting of a double pawl 61 engaging a wheel 62 having a pinion 63, which gears with depressions 64 in the disk 13.