Patent GB-915699-A (GB)
Title: Glass bending apparatus
IPC: C03B23/027
Filed: 1961-03-10
Abstract: 915,699. Glass-bending moulds. SHATTERPROOF GLASS CORPORATION. March 10, 1961 [March 29, 1960], No. 8886/61. Class 56. In a two or three part skeleton glass-bending mould mounted on a cradle, the means for mounting the mould on the cradle include a member, such as a wheel, mounted for free linear travel on, and in contact with a part of, the cradle lengthwise of the mould, a section of the mould forming one end thereof being sharply curved adjacent its inner end and pivotally connected to the member for movement linear with the member on the cradle and for rocking movements about a transverse axis intermediate the ends of the section and adjacent the portion of greatest curvature, means being provided for restraining movement of the inner end of the rockable end section in the direction of movement of the member. As shown in Figs. 3, 4, a three-part mould B-A-B comprises side and end rails 1, 6 pivoted together at 12 so that their top edges 2, 8 form a continuous concave glassshaping surface in the closed position and support hard glass sheet in the open position. The mould is removably mounted on a cradle C, each rail 1 having a pin 32 engaging an open vertical groove 34 mounted on cradle base 14 and each end rail 6 having a pair of wheels 21 riding in horizontal V-shaped guide ways 19 mounted on uprights 17 at each end of the cradle. Each wheel 21 is mounted on a shaft 23 fixed to an arm 24 extending upwardly from a transverse shaft 26 fixed in brackets 27 depending from the rail 6, one arm 24 at each end being adjustably secured to the rail 6 relative to the hinge 12 by a detent 30 engaging between pins 29 on an arcuate plate 28 secured to the rail 6. The adjustment allows variation in the counterbalancing effect to compensate for differences in the rate of heat absorption of different glasses. As shown in Figs. 9 and 10, a two-part mould A1-B1 comprises side rails 41 pivoted at 54 to an end rail 49, the opposite ends of rail 41 being joined by a cross rail 43 and the top edges 42, 50, 43 forming a continuous concave glass-shaping surface in the closed position, the hard glass sheet being supported on the rail 43, the ends of rail 41 and the cross portion 51 of rail 49 to lie against aligning lugs 62 on rail 43. The mould is removably mounted on cradle C1, each rail 41 having an arm 57 secured to brackets 55 thereon by a removable pin 56 and the rail 49 having a pair of wheels 21a riding on horizontal V-guide ways 19a mounted on uprights 17a. Each wheel 21a is mounted on a shaft 23a fixed to an arm 24a extending upwardly from and fixed to a transverse shaft 26a journalled in brackets 27a depending from the rail 49, one arm 24a being adjustably secured to the rail 49 relative to the hinge 54 by an arcuate segment 58 on the arm 24a having teeth 59 to engage a looking rib 60 fixed to rail 49, the shaft 26a being movable outwardly to disengage and adjust the angle of segment 58 and locked in engaging position by a pin 61. For steeply curved windscreens, hold-down devices on rail portion 51 each comprise a bar 64 secured thereto, joined by parallel links 65 to a bar 66 having at one end 67 an arm 68 with a sheet-engaging shoe 69 and, at the other, pins 71, 72 between which is engaged one end 74 of lever 73 pivoted to bar 64 and having at the other end a counterweight 75 so that in the open position of the mould the shoe 69 lies clear of the glass sheet and in the closed position presses lightly against the glass to hold it to the mould. U.S.A. Specification 2,872,756 is referred to.