Patent GB-355847-A (GB)
Title: Improvements in and relating to clutches for the driving of machinery
IPC: F16D13/22
Filed: 1930-06-05
Abstract: 355,847. Friction clutches; operating clutches and variable-speed gearing. FARLEY, J., Chesterton, Queen's Road, Hertford. June 5, 1930, No. 17476. [Class 80 (ii).] In friction clutches for line-shafting pulleys, motor vehicles, electric machines, &c., of the kind in which the surfaces are engaged by springs acted on by cams and toggles, the cams are fulcrumed on a presser-plate, are rocked by toggle elements actuated by a sliding-sleeve, and coact with transverse bridging-bars mounted on bolts controlled by preferably adjustable springs. The double-cone clutch shown in Figs. 1 and 2 comprises a member 2 fast on the driving-shaft 1, a slidable plate 14 carrying a cone 6, and a slidable oil bath casing 7, 15 carrying a cone 5 and a driven pulley &c. (not shown). Adjustable forked toggle links 22, 23 are connected to a control sleeve 19 and to rocking members 26, 27, which are fulcrumed on transverse rods 28, 29 seating in recesses in the plate 14 and are integral with prismatic cams 32, 33. These cams act by their corners 41 on bridging-bars 34 connecting pairs of tension bolts 37, which pass through the parts 34, 14 and slide in recesses in the casing-half 7. When the clutch is disengaged, the bolt-heads are pressed by compression springs 36 against screwed abutments 39 closing the casing- recesses, whereby the initial spring stress can be adjusted. On moving the sleeve 19 from a stop 42a to carry the links 22, 23 just past dead-centre, the plate 14 is thrust to the right through the rods 28, 29 and the casing 7, 15 to the left through the springs 36 to engage the clutch. On release, adjustable spring-plungers 43 separate the surfaces 3, 5 and 4, 6. The plate 14 may be fixed and the casing and member 2 slidable, or, to avoid axial movement of the driven pulley, the casing may be axially fixed and either the member 2 slidable on its shaft 1 or the cone 5 slidable in the casing and connected to the bolts 37. In a modification, a control-sleeve 49, Fig 5, carries wedging-members 56, Fig. 8, acting on pairs of toggle-links 47, 48, which may be adjustable and be directly connected to the rocking members as before or, as shown, to the joints 53 of pairs of links 50, 54 pivoted respectively to brackets 51 on the casing and to the rocking cam-members 55. Fig. 7 shows a modified adjustment for the springs 36. A sleeve 57, non-revoluble in t h e recess 35, is screwed on the bolt 37, the compression of the spring 36 being varied by a screwed plug 58 and the clearance 59 between the bolt-head and bridging- bar 34 independently adjusted by turning the squared end of the bolt. As applied to a motor vehicle, an auxiliary plate clutch 75, Fig. 9, is connected by a coupling 60 to the driven end of the change-speed gear 61, and is engaged by linkage 62 .. 66 on depressing a pedal 67 against a spring 70. A spring-pressed catch 71 coacts with a notch 69 in a bolt 68, moving with the pedal, to hold the clutch engaged, and can be released by a handle 74 and Bowden wire 73. Alternatively, the pedal 67 is omitted, and the changespeed lever 80, Fig, 10, has a cam slot 88 coacting with a pin 90 on a bell-crank lever 91 connected by a rod 65a to the clutch sleeve, the slot 88 being so shaped as to be operative to engage the clutch only on extended angular movements of the lever, when fixed cam surfaces 85, 86 act to lift a coupling- latch 84 from a notch 83 in an arm 82 fixed to the gear-box control shaft 81, on which the lever 80 is revoluble. The pin 90 and latch 84 are wide enough to remain in engagement respectively with the slot 88 and surfaces 85, 86 when the lever is moved laterally in its gate (not shown). Either of the above control means may be applied to the main or engine clutch.