Patent GB-578442-A (GB)
Title: Wringers
IPC: D06F45/18
Filed: 1943-11-03
Abstract: 578,442. Wringers. TRIGGS, W. W. (Lovell Manufacturing Co.). Nov. 3, 1943, No. 18244. [Class 138 (ii)] In a wringer of the kind wherein the rolls are driven through a clutch having engaging driving members acting to release the clutch under excessive torque, and wherein a latch holds the driving member disengaged, the latch also serves as resilient means to hold the driving members engaged. In the construction shown the rollers 13, 14 are mounted in stiles 11, 12, Figs. 1, 3 and 4, carried by a base 10 which is swingably mounted by means of shafts 26, and links or bellcrank levers 29, 32 on a frame 5 mounted for adjustment on a vertical axis about a post 1, the links being pivoted at 30, 33 to the base. Pressure on the top roller 14 is maintained by a spring 17a, adjusted by means of a slide 21 having stepped notches adapted to engage projections 21a secured to the spring. The slide is movably mounted in the top bar 17; pivoted at 18 to a post 6 rigid with the frame 5. The top bar is secured in position, so as to maintain pressure on' the top roller, by toggle links 112, 113, Figs. 1 and 17, controlled by a spring 117a and secured by a latch 119; Fig. 20, pivoted at 120. The lower roller 13, Fig. 4, is driven from a shaft 36 through bevel reversing gear 39, 40, 41 embodying a sliding clutch 56, which is automatically released when there is an overload. The gear 41 drives the roller 13 through a coupling 47 and a slidable cone 15 which automatically disconnects the drive when the pressure on the top roller is released, as described in Specification 529,378. The reversing clutch 56 has inclined surfaces 55 adapted to engage, corresponding recesses 53, 54 in the bevel pinions 39; 40 and is slid on the shaft 36 by means of a crank-pin 58 indirectly controlled by a handle 72. The crank-pin 58 is carried by a bell-crank lever 59 connected by a link 62, Fig. 7, to an arm 65 on a shaft 66, 67 on which the handle is loosely mounted by means of a sleeve 70. The shaft 66, 67, Figs. 7 and 16, passes through (1) a slot 89 in a slidable locking plate 85 guided for vertical movement by a pin working in a slot 86 and normally drawn upwards by a spring 85a, (2) a pair of plates 75, 76 loose on the shaft, and (3) a control plate 69 secured on the shaft by lugs 73 and normally kept in an upright position by a spring 84. The sleeve 70 of the handle 72 carries an arm 81 having (1) a pin 90 engaging a slot 91 in the locking plate 85, and (2) slots 79, 80 engaged by projections 77, 78 formed on the plates 75, 76 which are mounted scissors fashion on the shaft and have their upper ends drawn together by a spring 82. The arrangement is such that when the handle 72 is rotated the pin 90, riding up one of the cam slopes 92, 93 in the plate 85, forces this plate downwards so that a lug 94 or 95 thereon clears a corresponding lug 75a or 76a on the plates 75, 76, and the latter are rocked by means of their projections 77, 78. The control plate 69 has a head 69a lying between the projections 77, 78, so that this plate is also rocked and with it the shaft 66, 67 to cause the reversing clutch to engage one of the pinions 39, 40 to drive the roller 13 in the selected direction. When the pin 90 reaches the end of the cam slope 92 or 93 it is engaged by a notch 96 which allows the plate 85 to be drawn upwards by its spring, with the result that a lug 94 or 95 moves up behind a projection 75a or 76a and locks the three plates 69, 75, 76 in the clutch-engaged position. The clutch 56 is released by hand when the handle 72 is rotated, or is released automatically when (1) the driving torque on the roller 13 becomes excessive; if this is the case the reaction caused by the sloping jaws of the clutch rocks the shaft 66, 67 and the control plate 69, so that the head 69a bears against the appropriate projection 77 or 78 and, as this bears against the side of the corresponding slot 79 or 80 in the arm 81, the latter is rocked and the pin 90 thereon acting on the side of the notch 96 forces down the slide 85 to release the members 69, 75, 76 and allow them to return to neutral position. (2) The wringer is swung by hand about the vertical post 1; the wringer is normally locked in position by a spring-loaded bolt 98 engaging one of a series of holes 97 in a plate 3 on the post; when the wringer is to be swung to a new position the bolt is raised by the depression of a hand lever 102, and this lever passes through a slot 106 in the plate 85 so that it depresses the plate and disconnects the driving clutch 56. (3) The operator instinctively pulls at the wringer to avoid being trapped; this movement rocks the links 29 by which the wringer is suspended at the driving end; and these links have extensions 108 with ends 109 adapted to bear on a lug 110 on the plate 85 so as to depress the latter and release the driving clutch. (4) The top bar 17 of the wringer is released to relieve the pressure on the top roller. Levers 139, Fig. 4, pivoted at 140 have their lower ends passed through slots 141, Figs. 7 and 16, in the plate 85, while their upper ends 145 are normally kept in the position shown in Fig. 4 by the top bar 17. When the latter is released springs 142 act on the levers and depress their lower ends and the plate 85 to release the driving clutch. The release of the top bar also disconnects the drive at the slidable cone 15. This cone is driven by the coupling 47 and can slide relatively thereto; it transmits the drive to the roller 13 by means of pins 51 on the roller shaft engaging recesses 52 in the cone. When the top roller is forced down on the lower one the cone 15 is pressed down on the inclined surface 50 of its bearing 50a and is thereby biased to the right to keep the pins 51 in driving engagement with the recesses 52, but when the pressure on the rollers is released the cone 15 is freed from the bearing 50a and is forced to the left by a spring 52a to disconnect the drive. The top bar 17 may be released either by pulling on the toggle 112, 113 or by pushing or pulling on trip-bars 125, Fig. 17. These bars form cranked extensions of shafts 125a, having arms 126, 126a carrying a pin 129 engaging a slot 130, Fig. 20, in a latch 119 pivoted at 120 and serving normally to lock the toggle by means of a notch 123. The arrangement is such that whichever way the shafts 125a are rocked the latch is rocked clockwise to release the toggle and therefore the top bar 17.