Patent GB-109544-A (GB)
Title: Improvements in and relating to Glass Blowing Apparatus.
IPC: C03B23/07
Filed: 1916-12-05
Abstract: 109,544. British Thomson - Houston Co., (General Electric Co.). Dec. 5, 1916. Forming electric-lamp bulbs and the like; forming lamp glasses and the like. - Relates to machines for blowing glass bulbs &c. from lengths of glass tubing and of the kind described in Specifications 1033/82 and 12,824/11 i n which the tube is supported at its ends in chucks, one of which is movable. Means are provided for opening and closing and for rotating the chucks in unison, and the clutch for stopping and starting the machine is arranged so that the chucks cannot be actuated to release the tube until the machine is stopped, and vice versa, the machine cannot be started until the chucks are closed. Means also are provided for heating the tube, and for admitting compressed air through the fixed chuck to the tube. The glass tube 73, Figs. 2 and 4, is inserted through transverse slots 81 in the chucks, and is gripped by fingers 70 at the ends of spring-pressed jaws 68 pivoted in radial slots 67 in the chucks. A sleeve 63, with a tapered end 62 against which the fingers 70 are pressed by springs 72, is moved against the pressure of a spring 65 by rods 58, which are forced against the end 59 of the chuck by studs 56 on bell-crank levers 52. The shafts 45 of the chucks are driven by double cranks from shafts 38, 39, which are connected by a sleeve 40. The carriage 36 of the movable chuck is slid along tracks 14, carried by bearings 12, 13 at the ends of the baseplate 10, by means of a belt 88 which passes over a pulley 90 to a pulley 87 on a transverse shaft 85. The driving-pulley 110 is provided with a barrel 111, Fig. 6, containing a spring-pressed pawl 112 engaging a recessed collar 116 on the shaft 38, and a finger 114 on the pivot 115 of the pawl projects into an opening 116<a> in the barrel. The levers 52 of the fixed chuck are connected by chains 53 to a plate 118 at the upper end of a bar or rope 119, which also engages a stud 120 on a lever 121 mounted on the forward track 14. The levers 52 of the movable chuck are connected by chains 53 to a lever on the same track 14. A pin 125 on the lever 121 engages a slot 126 in a bellcrank lever 127 having a roller on the other arm.. When the bar 119 is pulled down, the lever 121 descends until the roller bears against the barrel 111, and when the roller enters the opening 116<a>, it disengages the pawl 112 from the collar 116 and stops the barrel, at the same time allowing the finger 125 to clear the lower finger 130 of the lever 127 so that the lever 121 can descend and rotate the track 14. After inserting the glass tube, the rod 119 is released; the lever 121 ascends and the pin 125 engages the larger finger 131 so that the roller is moved out of the opening 116<a>, whereupon the spring 113 forces the pawl 112 into the next recess 117 that passes it and the barrel 111 and shafts 38, 39 are rotated. Air is admitted to the tube through a passage 79 in the fixed chuck and through a hollow screw 20 in the bosses 18, 19 from a supply pipe 28 provided with a by-pass 31, which is normally open but can be closed by a ball valve 34 provided w'th a finger-piece 33. The burner-body 101, mounted on wheels 102, is moved along the tracks 14 by means of a belt 98 which passes over a pulley 99 to a pulley 97 on a transverse shaft 95. Gas is supplied from a mixing-valve 104 to the chamber 102a of the body 101, which is fitted with projecting pipes 108 provided with burners 109.