Patent GB-539815-A (GB)
Title: Improvements in starting devices for internal combustion engines
IPC: F02N5/02
Filed: 1940-02-09
Abstract: 539,815. Turning-gear. AKTIEBOLAGET BOLINDER-MUNKTELL. Feb. 9. 1940, No. 2567. Convention date, Feb. 13, 1939. [Class 7 (v)] A starter for diesel or other engines includes one or more springs 52 connected to a rotatable element 50 and adapted to be stressed on rotation of the element through half a revolution, means to transfer the spring energy to the element on further rotation thereof in the same direction, and a friction clutch 56 transferring the energy from the rotatable element to the engine shaft. In one form, shown diagrammatically in Fig. 1, opposed springs 52 are connected through rods 53, 54 to cranks 51 of the shaft 50, which carries friction discs 55 each co-operating with a friction clutch 56. Projecting portions of the clutches 56 are connected by links 60, levers 57 and connecting-rods 72 to opposed cranks 73 on a shaft 74, so that step-bystep rotation of the shaft 74 by means of a manually actuated ratchet lever 84 brings the clutches 56 into engagement alternately to effect rotation of the shaft 50. When the springs 52 have been stressed, an arm 88 pivoted to an arm 87 on the shaft 74 is moved by a spring 89 into engagement with a notch 91 of a disc 90 on the shaft 50, to hold the springs 52 in stressed position. Another disc 92 on the shaft 50 is connected through a lever 95 and links 96, 97 to a gripping member 93 adapted to be expanded into engagement with a drum 94 mounted on a flywheel 21 on the engine shaft. In the stressed position of the springs 52, a notch 113 in a disc 112 on the shaft 50 is engaged by a tooth 114 on an arm 106 pivoted to an arm 108 controlled by springs 110, 111 and terminating in a fork 109 adapted to engage an arm 103 pivoted on the shaft 74. The arm 103 is provided with a pawl 102 engaging a ratchet-wheel 101 on the shaft 74, and with a contact shoe 104 bearing upon an eccentric surface 105 of the drum 94. On further rotation of the shaft 74 by means of the lever 84, the arm 88 turns the disc 90 so that the springs 52 snap over from their stressed position and turn the shaft 50, and the expansion of the member 93 into engagement with the drum 94 causes the torque to be transmitted to the engine during half a, revolution of the shaft 50. The member 93 then releases the drum 94, while the arm 88 and the tooth 114 ride on the peripheries of the discs 90, 112, and the spring 110 brings the arm 103 and shoe 104 into contact with the surface 105. Continued rotation of the engine then effects step-by-step rotation of the shaft 74 by means of the pawl 102 and ratchet 101 to re-tension the springs 52, until the arm 88 and tooth 114 come into engagement with the notches of the discs 90, 112 when the member 108 lifts the arm 103 and shoe 104 from the surface 105. In a practical embodiment, Figs. 3 and 6, the shafts 50, 74 are mounted in a casing 120 and the springs 52 are assembled in compression between yokes 122. 123 sliding on guide rods 124 in the casing and connected by U-shaped connecting-rods 53, 54 to the cranks 51 of the shaft 50. The remaining parts are analogous to those of Fig. 1, the shaft 74 being actuated by a lever 84 through a one-way ratchet clutch 125.