Patent GB-1398427-A (GB)
Title: Apparatus for making coffee
IPC: A47J31/30
Filed: 1972-10-10
Abstract: 1398427 Coffee-brewing apparatus BUNNO-MATIC CORP 10 Oct 1972 [11 May 1972] 46637/72 Heading A4E [Also in Division F4] A coffee making set comprises: a funnel 28, Fig. 1 for carrying a coffee filter 29; a funnel 63, Fig. 9, for receiving a porous bag 80 containing ground coffee; an adapter plate 53, Fig. 9, having funnel support arms 59, 60 depending therefrom for mounting the funnel 63; and a machine 10, Fig. 1, including support rails (27), Fig. 2 (not shown) for slidably receiving either the funnel 28 or the adapter plate 53, the machine 10 further including a hot water supply system adapted to supply hot water to a selected one of the funnels 28, 63 when supported by the rails (27). Fig. 1 depicts the set arranged for use of the filter 29 and the funnel 28; Fig. 3 (not shown) depicts the set arranged for use of the porous bag 80 and the funnel 63. The machine 10 includes a hot water tank 13, Fig. 12, having a hot water discharge line 15 and an air vent line 16. Control switches (18) Fig. 2 (not shown) and 19 for warmers 20 and 21 are located on a front panel of a housing 14. A control switch 22 for a warmer 23 is also provided on the front panel (17). Switches 36 and 37, Fig. 12, connect conductors 38 and 39 across a current source. When the control switch 22 is operated an indicator lamp 40 is lighted and an energization circuit for a start switch 24 is prepared. Momentary operation of the start switch 24 energizes the winding 41 w of a relay 41 and normally open contacts 41a are closed. In addition a circuit is completed through normally closed contacts 42 of a timer 43 for operation of the motor of the timer and also for energizing the winding 44 of a solenoid valve 45. A holding circuit is completed through the contacts 41a and the start switch 24 may be released. Cold water flows through a flow regulator 47 into the bottom of the tank 13 where it is heated by a heating element 48 under the control of a thermostat 49. At the end of a pre-set time interval the contacts 42 are opened and the windings 41 w and 44 are de-energized. The solenoid valve 45 is closed and further flow of cold water is prevented. The air vent line 16 is opened to atmosphere and hot water continues to flow through the discharge line 15 under siphon action. When the machine 10 is used with the funnel 28, hot water is supplied from a spray head 31, Fig. 1, and the coffee extract flows through an aperture 32 into a jug 33 positioned on the warmer 23. A shut-off valve 113 inserted in the air vent line 16 is closed by a winding 114 when the solenoid valve 45 is opened. The funnel 63, Fig. 9, has a generally rectangular body portion 64 and is provided with an aperture 70. A handle 77 extends from a frame 73 formed integrally with the funnel 63. When the machine 10 is used with the funnel 63, the upper end of a nozzle 55 is threaded on to the hot water discharge line 15. The nozzle 55 carries a circular plate 56. The porous bag 80 is located between the plate 56 and a removable plate 82. The plate 82 may be positioned at three different distances from the plate 56 to provide for porous bags of different thicknesses. Detents (95) Fig. 10 (not shown) and 105 hold the plate 82 in position. A tab (108) is provided for removing the plate 82. Triangular openings are provided between the plate 82 and the funnel 63 at the corners of the funnel. Ribs (84) extend inwardly from the corners of the funnel to prevent the porous bag 80 from shutting-off the flow of coffee extract.