Patent GB-829292-A (GB)
Title: Machine for completely laundering fabrics
IPC: D06F35/00
Filed: 1956-02-08
Abstract: 829,292. Washing machines. MURRAY CORPORATION OF AMERICA. Feb. 8, 1956 [May 26, 1955], No. 3962/56. Class 138 (2). [Also in Group XIII] In a laundering machine a sequential controller energizes a high-speed component of the transmission for 1.5 or 2 seconds and deenergizes it for 13.5 or 13 seconds and this is repeated twelve times in succession to constitute the entire spin-drying cycle. In a machine having a basket 23, Fig. 2, with perforations 24 and mounted to rotate in a tub 26, a glass door 46, a water-filled base 25, and adjustable non-skid feet 27, a motor 52 drives the basket at high speeds through a clutchoperated pulley 66, a belt 71 and a pulley 72 and at low speeds through a pulley 65, a belt 68, pulleys 69, 72, and the belt 71. Air is drawn from a chamber 55, Fig. 3, by a motordriven blower 54 and passed through ducting 57 over three 2000 w. electric heating elements 111 to enter the basket through an orifice 58. The blower draws the moisture-laden air from the basket through the perforations 24 over a water-cooled condensate collecting wall of the chamber 55 prior to re-entering the ducting 57. If a spray tube 64-for cooling the said wallis not used, about 10% of the moist air is passed to atmosphere through a duct 63, make-up being effected through a solenoid-operated damper 70. A motor-driven pump 33 drains the tub 26 and a tube 36 associated with a valve 37 connected to the drain outlet 32 provides a control for shutting off washing water being supplied through a pipe 51 when a desired height is reached in the tub. In a further machine a basket 87, Fig. 4, rotates in a tub 88 and three 2000 w. heating elements 111, backed by a reflector 112 and an insulator 113, radiate heat into the basket through a screen 115. The tub may have an air outlet 117 to which a blower 118 may be attached to discharge 10% of the air circulated in the tub by the blower, make-up air entering the tub through a solenoidoperated damper 119. The tub is drained via a tube 122, Fig. 5, by a motor-driven pump 123, the motor 124 of which also rotates the basket and the blower. With no drain valve in the tube 122 a solenoid-operated clutch connects the motor and the pump, but if a solenoidactuated drain valve is used the clutch is eliminated and the pump drives continuously. The motor has fixed and solenoid-operated pulleys 128, 129 used for low and high speeds respectively. The blower 118 and the damper 119 may be omitted, in which case the air is agitated by the rotating basket 87 and a condensing area is formed on the tub wall by water from a spray tube 121. In the electric control circuit of the machines, the heaters 111 are connected in units 186, 187, Fig. 7, of 2000 w. and 4000 w. respectively, which may be switched to function as a 6000 w., a 4000 w. or a 2000 w. heater. The operation diagram, Fig. 6, shows the heater " on " for most of the time and the basket motor-band 150-"on" except for one minute, 151, at the end of the extraction period. The timer motor-band 152-is interrupted during the drying cycle at 153 and 154. Water is fed into the tub and a washing cycle performed-band 155-followed by rinsing cycles 156. After the wash cycle, the drain valve is opened, or the pump operatedband 157-which is interrupted once at the point 158 to provide a deep water rinse. Acceleration impulse extraction-"Accelex," band 160-occurs during the rinsing after draining and during a spray rinse period. The heaters are energized after the rinsing cycle-bands 159, 161-at the time the blower is operatedband 162. The heaters are cut off when the driving motor stops, but are re-energized with its re-start. Simultaneously the water spray or damper is actuated-band 164. The timer motor continues for a set time, after which it is stopped, 153, until a thermostat re-energizes the timer motor and cuts out the 2000 w. heater, 165. Thereafter the timer stops, 154, until the thermostat again closes its contacts when the temperature rises to thereby re-energize the timer, disconnect the 4000 w. heater and re-connect the 2000 w. heater. The timer continues to operate for an adjustable amount of time, then the entire machine shuts down. After the rinsing operation and when the tub has been drained the three-minute plurality of impulses take place-band 166-each succeeding impulse of which may attain a higher maximum speed, Fig. 14. The operation of each machine is controlled by a motor-operated device of a standard form, some examples of which are described in the Specification. Instead of the complex belt and pulley transmission, the high and low basket speeds may be obtained by using a motor having a speed reducer giving four different solenoid-controlled speeds. Should the machines vibrate tinder an accelerated impulse to cause movement over the floor, a switch 224, Fig. 12, having an engageable weight 226 and a plunger 225, operates to either stop the machine entirely or to interrupt its operation for the remainder of the impulse.