GB365397A - Improvements in or relating to clutch mechanisms - Google Patents

Abstract

365,397. Operating friction and positive clutches. SULZER FR’RES SOC. ANON., Winterthur, Switzerland. March 12, 1931, No. 7703. Convention date, March 14, 1930. [Class 80 (ii).] The operating- gear for combined non - positive and positive clutches is provided with locking-means preventing engagement of the non-positive clutch under load and further locking-means preventing engagement of the positive clutch while the difference of speed between the driving and driven shafts exceeds a predetermined amounts A drum 2, 3 secured to a driving-shaft 1 carries one member 4 of an electromagnetic friction clutch, the other member 15 of which slides in axial grooves in a part 9 secured to the driven shaft 7 and carries a disc 17 and a flange 16 surrounded by the stationary energizing coil 12, the members 9, 17 being separated by springs 20. The driving member 28 of the positive clutch is connected to the drum flange 3 by rubber buffers 30 and has notches 26 so disposed as to be engaged always by certain of the sliding bolts 25 carried by the driven member 8. The bolts 25 are thrown into engagement by spring-pressed rods 36 acting through rockers 33, when permitted by withdrawal of the coned end 86 of an actuating-rod 22. On closing a manual switch (not shown), the winding 12 is energized through leads 77, 78, Fig. 3, provided that contacts 71 have not been opened by a fluid-pressure device 68 responsive to load, such as a pump, on the driven shaft. When the shafts 1, 7 are in substantial synchronism, a belt-driven governor 66 closes contacts 72 in the leads 62, 63 of a solenoid 59 to cause retraction of a spring- pressed bolt 58 from beneath a collar 57, so freeing a lever-operated piston-valve 52 controlling the flow of pressure-fluid from a pipe 50 to a servomotor 41. When, as shown, the lever 80 is raised, the servomotor piston 40 is moved from the position A to the position B, first compressing a spring 83 behind a collar 42 on the rod 22 and then tripping a trigger 45 to shoot the rod 22 to the left and sharply engage the positive clutch. On applying load to the driven shaft, the contacts 71 open, so restoring the locking-bolt 58 and de-energizing the winding 12. To declutch, the load is first taken off, so withdrawing the bolt 58, the valve 52 is raised to reverse the piston 40, which acts through a similar spring 87 and trigger 46 on a collar 43 to cause sudden retraction of the clutch-bolts 25, and finally the manual switch is opened to throw out the friction clutch and restore the bolt 58 beneath the collar 57. As the contacts 71, 72 are both in the circuit of the solenoid 59, the positive clutch cannot be engaged before the friction clutch or disengaged under load.