Patent GB-807073-A (GB)
Title: Oven
IPC: B29C35/04
Filed: 1956-01-12
Abstract: 807,073. Rotary elevators. GUSTINBACON MANUFACTURING CO. Inc. Jan. 12, 1956 [March 1, 1955], No. 1046/56. Class 78(1). [Also in Group XII] Heat - insulating material in the form of a mat of fibrous material impregnated with synthetic resin is cured by wrapping lengths of the mat 486, Fig. 3, on perforate mandrels 488 which are automatically loaded into perforate containers or moulds 95 extending between pairs of hollow radial arms or ducts 94 disposed adjacent the ends of a rotatable cylindrical manifold 20, Fig. 2, enclosed in a housing 10, Fig. 1, and supplied with hot air through a duct 78 at one thereof, the manifold being rotated step'by step so that the moulds are carried from a position 142 in which they receive the wrapped mandrels to another 144 in which the mandrels are automatically discharged therefrom. The curing is effected by the passage of the hot air through the hollow ducts into the perforate mandrels and thence radially outwards through the wrapping and the moulds into the housing which is provided with air-extraction hoods 84 adjacent its ends. The step-by-step rotation of the manifold 20 is effected by a reduction gear 192, the output shaft 194 of which drives the manifold shaft 24, and the input shaft 190, Fig. 1, of which is driven through chain gearing 187 from the shaft 168 of a one-revolution clutch 164, 166 driven through chain gearing 158 from the shaft 154 of an electric motor 146. The clutch member 166 is secured to the shaft 168 and held against rotation by a spring-loaded bell-crank 174 engaging an abutment on the member 166. The bellcrank is freed from engagement with the abutment at predetermined intervals by the armature 184 of a solenoid 182, thus permitting the member 166 and its shaft 168 to make one revolution and the manifold one fourteenth of a revolution corresponding to the fourteen moulds 95 carried by the manifold. Each mould consists of a semicircular section. 104, Fig. 10, supported by end castings 98 bolted to the corresponding radial ducts 94 and quadrantal cover sections 106, 108 supported by castings 110, 114, the castings 110 being hinged to the castings 98 and the castings 114 hinged to the castings 110. Automatic opening and closing of the cover sections is effected by leaf springs 118 secured at one end to the castings 114 at opposite ends of the moulds and at the other to eye bolts 124 pivotally connected to toggle links 130. The toggle links are pivotally connected by eye bolts 132 to cranks 138 secured on a shaft 140 which projects at one end through a flange 208 on the manifold and carries a crank 210 on which is mounted a roller 212 which engages a fixed cam track shaped so that the covers close after the loading of a mould at the position 142 and open at the position 144, Fig. 3, at which means are provided for freeing the mandrels from their moulds so that they fall on to a discharger conveyer 356. After stripping, the mandrels are returned by the conveyers 524, 526, Fig. 1, to the re-winding position. The wrapped mandrels fed by a conveyer 476 are loaded into the open moulds by a pair of three-armed members 290, Fig. 9, mounted on the opposite ends of a shaft 274 carrying a disc 264 driven through rollers 260 mounted on pins bolted to a disc 258 secured to a shaft 248 and engaging cam grooves 266, 268 in the disc 264. The shaft 248 is driven through chain gearing 238, Figs. 1, 2, from the manifold shaft 24, and the mechanism is designed so that the shaft 274 makes one third of a revolution anti-clockwise for one step clockwise of the shaft 24. The ends of the mandrel spindle rest in the fixed fingers 300 at the ends of the arms adjacent the loading position 142, and the fingers 302 pivoted on the arms are closed on the spindle ends by pins 322 engaging slots 324 in the fingers 302 and carried by cranks 320 mounted upon shafts 306 supported at the ends of the arms and carrying cranks 308 supporting rollers 310 engaging cam grooves formed in fixed discs 314 secured to the oven frame. The mandrel is then deposited in the mould, its weight effecting reopening of the fingers 302. Specifications 777,823 and 804,436, [both in Group XXVIII], are referred to.