Patent GB-311696-A (GB)
Title: Improvements in or relating to food mixing machines
IPC: A47J43/044
Filed: 1929-03-07
Abstract: 311,696. Kitchen Aid Manufacturing Co., (Assignees of Jolanston, H. L., and Meeker, D. A.). May 14, 1928, [Convention date]. Stationary mixers with stirrers having complex motions. -A mixing-machine comprises (1) change-speed gearing for operating the mixing blade comprising a movable gear which is adapted to be rocked about an axis and moved along that axis to effect a change, one of the shafts in the train being adjustable by means of an eccentric mounting to prevent backlash, (2) means for controlling the change-speed gear by a member rocking about a fixed axis; (3) means for interlocking the driving motor control with the' change-speed gear control to prevent incorrect operation of the former, (4) means for raising and lowering the bowl. (1) The motor shaft 45, Fig. 11, drives a shaft 64 through gears 46, 60, 62, 63, the gears 60, 62 being mounted on a shaft 61 which is eccentrically mounted to facilitate adjustment to effect silent meshing with the gears 46, 63. The shaft 64 drives the shaft 47 through a train comprising double gears 70, 71 mounted on a frame 73 which can be rocked about the shaft 47 and moved along that shaft. As shown, the intermediate gear is in operation the train consisting of the gears 63, 71, 70, 76. The high gear train, brought into operation bv moving the frame 73 along the shaft 47 and then downwards, consists of the gears 63, 70, 76; the low gear is brought into operation by moving the frame axially of the shaft 47 the other way so as to effect the drive through the train 68, 71, 70, 76. Accurate meshing of the gears 70, 71 with the gears 63, 68 to secure silent running is ensured by a stop piece 120 slidably mounted in a member 130 and adjustable by means of a set screw 132; the surfaces 120, 124 of the stop are engaged by a projection 121 on the frame 73 when the latter is in each of its gear-engaging positions. The shaft 47 drives the beater spindle 15, Fig. 2, through bevel gear 51, 52 and planetary gear 56, 57. (2) The change of gear is effected by rocking a shaft 81 having a cam 85 thereon engaging a pin 80 on the rocking frame 73, the pin projecting through a slot in a fixed plate 83. As shown in Fig. 10, which shows the position of the parts corresponding to the setting of the gears shown in Fig. 11, the cam 85 is provided with cam surfaces 95, 86, and when rocked either to the right or left, first depresses the pin 80 to disengage the gears 63, 71, and then moves the pin 80 into one of the slots 90, 91 to permit engagement of the gears 68, 71 or 63, 70. (3) As shown in Fig. 8, the motor switch 101 is interconnected with a sliding- member 103 a nose on which can enter one of three notches 110 when the gear control is. correctly set to permit a full movement of the control 101. '(4) The bowl is carried on arms 21, Fig. 18 mounted to slide up and down a standard 10 and provided with an extension 27 engaged by a spring-influenced member 37 on a link 30. The latter is connected to a crank 31 operated by a hand-lever 32. The bowl is raised by moving 'the crank past its deadcentre, the crank-shaft having an arm 44 which normally misses a projection 44<1>, but engages it as shown to secure the bowl in a mid-position when the crank is pressed axially.