Patent GB-441646-A (GB)
Title: Improvements relating to machines for shaping electric lamp bulbs
IPC: C03B23/09
Filed: 1934-10-24
Abstract: 441,646. Glass manufacture. LAMP PATENTS, Ltd., 78, Oxford Street, London.- (Freeman, W. R. ; Teaneek, New Jersey, U.S.A.) Oct. 24, 1934, No. 30503. [Class 56] In a machine for shaping and moulding the neck ends of electric lamp bulbs, wherein cooperating moulding g means act on the inner and outer surfaces of the heated neck while the bulb is being rotated, the external moulding means are moved into engagement with the heated neck by automatic mechanism which acts also on the internal moulding means whereby after insertion of the latter into the neck it is moved laterally intc moulding engagement with the inner surface A number of bulbs are mounted in carriers 48 Figs. 1 and 6, around the periphery of a turret which is rotated inter mittently by mechanisn comprising a slotted can which is mounted on a horizontal shaft 34 and is engaged, in turn, by vertical studs 38 around the periphery of a horizontal disc 36 on the lower end of a hollow sleeve 15 carrying the turret. The bulb-holders each comprise a vertical sleeve 40 mounted for rotation in the turret and provided with a pinion 42 on its upper end. Mounted for free rotation within the sleeve 40 is a longer sleeve 44 carrying at its lower end a cross-bar 45 from the ends of which hang a pair of rods 46 carrying a bulb-supporting ring 48 between their lower ends. Three inclined pins 49 projecting inwardly and downwardly from the ring co-operate to form a bulb seat. Above each bulb seat is a cup 52 mounted on the lower end of a plunger which slides within the sleeve 44, a spring pressure being provided to press the cup 52 on to a bulb positioned within its seat. The pinions 42 of the several bulb holders are disposed around a driving pinion 66, each pinion 42 having a spring controlled clutch comprising two pins 59, Fig. 6, on a disc 58, which normally engage the pinion 42 and couple it to the sleeve 44. To open the clutch to enable a bulb to be inserted into or removed from its holder the machine is provided at the filling station with a device comprising a pair of horizontally opposed flanges 90 which project between a pair of spaced discs 62 on a vertical shaft 54 carried by the disc 58, means being provided to impart a lifting movement to the member carrying the flanges 90, whereby the pins 59 are lifted to open the coupling. In the example the turret carries eight bulb holders 23, and a corresponding number of operating stations are provided about the table 19, at all of which, except the first, are arranged one or more gas burners which heat the bulb neck progressively during its travel towards the shaping devices shown in Figs. 17 and 19. A pair of arms 131 pivoted at 133 to the table 19 carry at their free end a freely rotatable roller comprising a cylindrical portion 138 tapering to a conical portion 137. A shoulder 139 is formed by the portion 138 and the cylindrical shank 140 of reduced diameter. The arms are normally held apart by a spring 141 connected between extensions below their pivots, and are adapted to be moved inwardly towards the neck of a bulb by vertically reciprocating cam plates 143 which engage rollers 145 on the outsides of the arms, and are mounted at the upper ends of rods 147, 148 linked at their lower ends by a pair of cross-rods 161. A cam-operated rocking arm controls the vertical movement of the rods 147, 148 and the cam plates mounted thereon. The internal moulding-means comprising a mandrel 151 is lifted together with the rods 147, 148 and enters the open neck of the bulb, whereupon it is rocked laterally to bring its upper end 149 into contact with the inner wall of the neck, the supports for the mandrel being in the form of horizontal arms mounted on vertical pivots which enable the mandrel to be swung, a continuous rotation also being imparted to the mandrel by a pinion 204 driven by a bevel gear 210. A shearing-disc 155 on the part 149 of the mandrel co-operates with the shoulder 139 on the roller 138 to trim the edge of the bulb neck. The contour of the neck may be modified by varying the arrangement of contact ribs and grooves on the external and internal shaping tools. Specification 405,525, [Group XI], is referred to.