Patent GB-623324-A (GB)
Title: Pan greasing machine
IPC: A21B3/16
Filed: 1947-04-29
Abstract: 623,324. Greasing baking pans. ROSELUND, H. A. April 29, 1947, No. 11508. Convention date. Aug. 27. 1941. [Class 28(i)] [Also in Group XXIX] In a pan-greasing machine in which, e.g. a multiple-cup baking pan 25, Fig. 8, is placed upside down on a carriage D which is then moved over grease sprayers 45, scrapers 120-122 are provided to scrape grease from the underside of the carriage parts whereby the grease drops into a sump 30 for re-use. The scrapers are provided with thermostatically controlled electric heaters 124, Fig. 11, to melt the grease, and each scraper 122 straddling its heater 124 is pressed upwards by a spring 123 against the undersurfaces to be scraped clean. The top C of the machine, including the carriage D can be hinged up by hand and held there by a toggle link 11 to allow access to the interior. Another hinged piece 155 at the top of the front wall also allows access. A hinged canopy 156 is provided over the central part of the top. A vent is provided from the sump. A multiple-cup pan is inverted over a correspondingly apertured shield plate 20 which is clamped to the carriage by eccentric grippers 26. The carriage is then traversed to the left by an engaging pin 114, Fig. 4, mounted on a driven chain 110 engaging a bracket (116 not shown) until it comes into spraying position when the spray guns 45 are automatically operated to spray the grease upwards. (The grease in the sump has been previously heated by the heaters 124 to spraying consistency.) When the carriage has moved to its left hand limit the solenoid controlled valve 101 operates to discontinue spraying. The chain 110 continuing its traverse on the other run, returns the carriage and pan to initial position for removal. The sprayers 45 comprise a tube 72, Fig. 13, for the grease with a needle valve 85 to be retracted when compressed air is supplied at 75. Grease is supplied through 44. Air passes through the air orifice 71 to mix with the grease from 74. The spray is distributed and whirled by an apertured cap 76 rotated by a chain and sprocket 81 driven from a motor 96, Fig. 4, which also drives the pan carriage. Hot grease scraped off by the heated scrapers 122 and falling into the sump 30, Fig. 6, is forced down through a screen 35 by flexible wiper blades 39 of an eccentrically located rotor 38. The grease is then sucked through 41 by a pump 42 and delivered to a pressure chamber 43 for supply through pipes 75 to the sprayers. Excess grease passes back to the sump through a leak valve 48 and return pipe 46, the leak valve being opened by pressure on a diaphragm 47. This pressure is adjusted by screwing a cap 50. The motor 51 drives both the rotor 38 and the pump 42. Two baffle plates 150 prevent grease from being sprayed over the top of the ends of the sump. The machine is electrically controlled as follows: Push button switch 131 closes the main circuit a to lines e and f, line e connecting with the main line b through relay coil g while f connects with line b through relay coil h, thus closing the two relay circuits. Closing of relay circuit g closes a shunt circuit i of valve operating solenoid 132 through switch j. Shunt circuit k to the limit switch 134 is completed through relay switch l. Relay coil g energized by closing switch 131 remains energized after 131 is opened so that the air valve solenoid remains active to spray until the limit switch 134 has been opened to de-energize relay coil g. Closing of relay circuit h starts the drive motor 96 and after spraying the limit switch 133 and relay switches m, m and n open to stop the motor 96.