Patent GB-991311-A (GB)
Title: Tyre buffing machine
IPC: B29B17/02
Filed: 1964-04-20
Abstract: 991,311. Buffing tyres. PAUL E. HAWKINSON CO. April 20, 1964 [June 13, 1963], No. 16297/64. Heading B3D. [Also in Division B4] A tyre buffing machine comprises means for imparting limited longitudinal movements to a slide member 3 along a guideway 2 on a base 1, a pivot 65 on the slide member for a second guideway 64 in which a second slide member 67 is mounted for limited longitudinal movement, a mounting standard 70 on the second slide member for a power-operated buffing head 71 which rotates about a horizontal axis, a tyre mounting power head 15 which is carried by the upper end of a column 14 mounted on the base offset from the first guideway and has a horizontally-disposed outwardly-projecting shaft 23 for receiving a tyre, means journalling the head 15 for limited swinging movement of the projecting end of the shaft about a vertical axis, and means 32 releasably locking and supporting the projecting end of the shaft in its operative position wherein the axis of the shaft is normal to the longitudinal axis of the guideway 2. The slide member 3 is movable along the guideway 2 by screw-and-nut mechanism 11 by a chain drive and reduction gearing 5 from an electric motor 4, and the second slide member 67 is movable in a similar manner along the second guideway 64. The latter guideway is supported at its forward end on the pivot 65 on the slide member 3, the rear end of which is provided with a segmental rail 72 carrying spaced rollers 73 engaged by a segmental rail 74 secured to the underside of the guideway 64, the arrangement permitting movement of the guideway 64 about the pivot 65. The standard 70 is carried by the second slide member 67 and supports the power-operated buffing head 71 at its upper end. The tyre mounting power head 15 is mounted on the upper end of the column 14 and comprises an electric motor 16 which is coupled by reduction gearing 17 and a chain drive 18 to the shaft 23, the assembly being mounted on a plate 40. A flange 25 and a removable spacer 28 provide means for mounting tyres A of different sizes on the shaft 23. The plate 40 rests on the upper flange 60 of a sleeve 59 having a lower flange connected by a tubular wall 55 to a plate 41 which is secured to the upper end of the column 14 and has an aperture 42 slidably receiving a reduced end 43 of a neck 39 depending from the plate 40. A split collar 44 having parts 45, 46 urged apart by springs 47 is supported by the end 43 and engages the plate 41 and a thrust bearing 49 abutting a larger threaded portion 51 of the neck engaged by a nut 50 having recesses 52 for a handle 53 which projects through an opening 54 in the wall 55. A washer 56 overlies the nut 50 and engages the underside 58 of the lower flange of the sleeve 59. When the nut is tightened, the surfaces 57, 58 on the washer 56 and lower flange and the surfaces 40a, 61 on the upper flange 60 and plate 40 frictionally engage to prevent rotation of the tyre mounting head 15 on the column. When the nut is slackened, the springs lift the head to reduce the friction between the surfaces 57, 58 and 40a, 61 so that the head is rotatable between a loading position, shown dotted in Fig. 1, in which the shaft 23 is assessable for mounting a tyre, and a position in which the shaft 23 is normal to the direction of movement of the slide member 3 for operation of the buffing head 71 upon the tyre, the two positions being accurately determined by a pin engaging co-operating holes in the plate 40 and flange 60. In the operative position of the shaft, a male centre 32 mounted at the upper end of an arm 30 engages a female recess in the projecting end of the shaft to lock and support the shaft in operation. The lower end of the arm is mounted on a horizontal pivot 31 and can be rocked about the pivot by a screw-and-nut mechanism 34 and hand wheel 35 to engage the male centre 32 with, and retract it from, the recess in the shaft.