Patent GB-910555-A (GB)
Title: Beverage making machine
IPC: D01D10/04
Filed: 1960-07-18
Abstract: 910,555. Beverage preparing machines. SEEBURG CORPORATION. July 18, 1960 [Dec. 31, 1959], No. 24966/60. Class 129. [Also in Group XVIII] In a beverage preparing machine, a piston 60 reciprocates into and out of a cylinder 25 with an open head 26 having a cover 30 which is removed for a brief period as the piston enters the cylinder 25, during which the cylinder is charged with beverage ingredients and after which the piston 60 moves further into the cylinder 25 so that at least some of the ingredients are forced through a discharge opening, subsequent retraction of the piston scavenging the cylinder. As shown, the brewer unit comprises a body casting with side walls 15, back wall 16, open front 17 and top and bottom 18 and 19, the front being closable by a splash panel 17D. The cylinder 25 is carried in an annular block 28 secured to wall 16 and containing an electric heating coil 52. The pivoted lid 30 has a gasket 33 which engages the top of cylinder 25 within a gasket cup 32 beneath which there is a filter grille 34 on which is secured a filter cloth 38. Lid 30 is secured to a threaded discharge nipple 36 which projects through a hole in the end of a channel-shaped rocker arm 40 to which it is secured. The other end of arm 40 is carried in a bracket 43 pivoted in the body casting and is oscillated through gearing and a crank-rod 48 from an electric motor 45 to open and close the lid 30. Within the body casting is an apron 20 with an aperture 21 to receive the rod 61 of piston 60. Near its lower end rod 61 has a coupling pin 57 which engages a slot in a lever 74 and has end rollers 58 which engage tracks 23 on the side walls of the body casting. The piston has a thin sealing skirt 64, e.g. of tetrafluorethylene, which is pressed outwardly by an annular resilient filler and spreader member 65, e.g. of rubber or the like, and a spider plate 67. At the bottom of its stroke, the lower end of rod 61 strikes shock-absorbing means 71 to dislodge the spent grounds. Lever 74 is pivoted at one end on a cross-pin 75 which projects through one side wall and is adjustably secured to a spring-biased lever 76, the spring being sufficiently strong to return the piston to the bottom of its stroke rapidly. A shaft 81 of a timer unit carries a piston cam 80 engaged by a cam roller 79 on lever 74 and having a deep notch 82 to allow the piston to drop sharply at the end of each brew cycle. Closely following the notch 82 is a shallow rise on to a dwell lobe 83 which raises the piston so that it just enters the cylinder where it is held for loading with a measured charge of ground coffee and hot water. Then during the engagement of roller 79 with the arc 84 of the cam the piston is advanced gradually until there is only just room for the grounds. This is followed by the deep drop when the spent grounds are deposited on apron 20. Adjustable switch cams 95 and 96 float on shaft 81 and are joined to the switch cams 97, 98 by a tie-rod 99. Timing cams 95, 96, 97 and 98 control respectively coffee delivery, hot water delivery, opening of lid 30 and brew timer motor 190. A selector knob sets selector contacts 151, 151x which effects delivery of coffee black or with cream or sugar or both or with double portions of cream or sugar or both. When the selector switch is set to black coffee and the start switch 160 is actuated, e.g. by a coin C closing contacts 161, 162 to commence operations a vend timer unit driven by a motor 171 is started and turns eight timer cams. Meanwhile, a cup dispenser 180 is energized by a motor 181 and deposits one paper cup beneath a dispensing nozzle 187 which leads from a mixing basin 188. Energization of relay coil 164 also energizes brew timer motor 190 which rotates shaft 81 and hence cam 80 which operates piston 60 through cam roller 79. Piston 60 is raised and dwell 83 holds it just within the cylinder while coffee cam 95 causes the energization of motor 200 which drives a screw 202 to dispense the ground coffee from canister 203 into cylinder 25 and immediately after a hot water valve 210 is opened under the control of cam 96 for sufficient time to deliver the required quantity of hot water to the cylinder. Cover motor 45 is then energized to place the lid 30 firmly on top of cylinder 25. The piston 60 then moves upwards forcing the brew out through filter 38 into delivery line 55 connected to a nozzle 56 directed into the mixing bowl 188 from which the coffee gravitates into the cup below. If selected, cream and sugar are introduced to the mixing bowl at the same time. Sufficient brew is made to leave some in line 55 so that when the piston drops suddenly, this is drawn back through the filter 38 to clear it of grounds. As the piston is nearing the bottom of cylinder 25 the cover 30 starts to open again under the influence of cover cam 97. As the cover approaches its open position a jet of hot water is released through spout 216 which washes down the cylinder walls and the piston and runs down apron 20 into waste receiver 232. The machine is stopped automatically when waste receiver is full. Hot chocolate is selected by setting contact 151 on contact 156 which causes chocolate powder and hot water to be delivered to a mixing bowl 400. This bowl 400 discharges into an agitator chamber 401 leading to a delivery tube 402 which terminates above the cup delivery station.