Patent GB-929078-A (GB)
Title: Blank mold assembly, particularly for glass forming machines
IPC: C03B9/34
Filed: 1961-03-24
Abstract: 929,078. Glass forming machines. OWENS-ILLINOIS GLASS CO. March 24, 1961 [March 28, 1960; April 11, 1960], No. 10849/61. Class 56. In a glass-blank forming machine, a baffle for a parison mould, or a top portion of the mould, is clamped in mating engagement therewith by a mechanism including a displaceable carriage supporting the baffle for movement into and out of seated relation with the mould, clamping elements carried by a pair of arms pivotally mounted on opposed sides of the carriage and a toggle mechanism for pivoting the arms to carry the clamping elements into and out of clamping engagement with the baffle and the mould. As shown in Figs. 2, 4, the parison mould 11<1>, which may be in two parts 11a, 11b, is formed with an annular boss 13 and internally shaped seat 12 for engagement with a boss 16 and projection 18 on a baffle 15. The projection 18 is formed with a moulding surface 19 forming a continuation of the moulding surface B of the parison mould 11<1> or 11a, 11b. The baffle 15 is removably mounted on a holder 21 by a bayonet joint 20, 22 and the holder 21 is mounted on a carriage arm 23 to slide in an arm 25, both arms projecting from a boss 24 mounted on a pistonrod 27 by pins 26 so as to be adjustable for different height moulds. Clamping shoes 31, to fit over the baffle and mould bosses 16, 13, are mounted at the lower ends of toggle arms 29 which pivot about pins 30 passing through projecting yokes 28 on holder 21 and at their upper ends are pivoted at 37 to pairs of toggle links 36 which are pivoted together by a pin 39 with a roller 40 between the links. The roller 40 fits in a yoke bracket 41 secured to baffle arm 23 by screws. The shoes 31 are normally held in the open position (Fig. 2) by a spring 44 extending over projections 43, 45 on the bracket 41 and holder 21, respectively. Each clamping shoe 31 is mounted on the arms 29 by a pin 34 through a vertically elongated slot 35 and lies against a convex bearing surface 33 so that each shoe has limited rocking and vertical sliding movement for adjustment to the clamped surfaces. The piston-rod 27 is mounted to raise and lower the baffle 15 to and from an out-of-line position with respect to the mould 11<1> and also to operate the clamping shoes 31 when the baffle is in seated position on the mould. The rod 27 is integral with a piston 50 and extension rod 54, the piston 50 sliding in cylinder 49 and rod 54 in end casting 55 integral with cylinder 49, the cylinder 49 being supplied with pressurized fluid through passages 60, 61 through a suitable valve controlled from the main machine in proper sequence. Rod 54 has a roller 58 riding in a slot 57 in a continuation 56 of casting 55, the slot having a curved upper section 57a causing the rod 27 to pivot the baffle out of line with the mould and a straight portion 57b to bring the baffle 15 into seating position on the boss 13 as in Fig. 2 and, on the continuing straight portion 57b to lower arm 23 so that the toggle arms 29 pivot against the pressure of spring 44 to bring the clamping shoes 31 into engagement with the bosses 13, 16. In a modification, not shown, the baffle holder is formed integrally with the boss on the pistonrod so that the piston-rod merely seats the baffle and a similar bracket to bracket 41 is connected to a piston-rod for separate operation of the clamping shoes.