Patent GB-865202-A (GB)
Title: Improvements relating to tyre buffing machines
IPC: B29B17/02
Filed: 1960-01-13
Abstract: 865,202. Buffing tyres. SUPER MOLD CORPORATION OF CALIFORNIA. Jan. 13, 1960 [Feb. 9, 1959], No. 1282/60. Class 31 (1).  A tyre buffing-machine comprises a frame 1, Fig. 1, supporting a buffing rasp 6 driven by a reversible electric motor S, and a horizontallymovable carriage 2 having mounted thereon a wheel 26 for supporting a tyre 27, the carriage comprising a pedestal 17 having projecting therefrom a beam 20 which passes through a yoke 14 for guiding the carriage towards the rasp to bring a tyre into engagement with the rasp. The yoke 14 is rotatably supported in vertically aligned end trunnions which form an axis about which the carriage can be pivoted. The movement of the beam 20 away from the yoke is limited by means of a cross-bar 23 engageable with adjustable stops 24 projecting from the sides of the yoke. The pedestal 17 has secured thereto a cross-beam 18 supported at its ends by castor wheels 19. The profile of the buffed tyre is determined by means of a template 45 engaging a roller 12. The template is supported removably on a plate 44 secured to the end of a hollow bar 35 projecting from a sleeve 34, the longitudinal movement of the bar being controlled by means of a screwed shaft fitted with a hand wheel 39. The sleeve 34 is provided with a slot 40 through which projects a pin 41 fixed to the bar 35, the pin carrying a pointer 42 which moves over a scale 43 which is graduated to denote tyre diameter sizes. The wheel 26 comprises a hub 55, Fig. 6, having side flanges 56 to which are secured further side flanges 58, the outer peripheries 59 of which support the tyre beads 60. The flanges 56, 58 are provided with opposed annular grooves 61 in which are clamped the beads 62 of a flexible inflatable diaphragm 63. The wheel 26 is detachably secured to a motor-driven spindle 25. Cuttings are removed by means of a hood 7 mounted on the frame 1 and connected to a motor-driven suction fan 8. The carriage 2 is prevented from swinging in its retracted position by means of a locking-rod 50 the lower end of which is adapted to enter an orifice in a floor plate 22. In operation, the carriage 2 is first retracted from the frame 1 and locked in position by the rod 50. The tyre is then mounted on the wheel 26 and the diaphragm 63 inflated. Also, an appropriate template 45 is mounted on the plate 44. After releasing the rod 50, the carriage is advanced towards the frame 1 so that when the template engages the roller 12, the tyre is just clear of the rasp 6. The motor 5 is then put into operation to rotate the rasp in a clockwise direction and the hand wheel 39 turned, while the template is held against the roller 12, in a direction only sufficient to engage the tyre with the rasp so as to make a shallow cut. With the tyre-rotating motor in operation, as well as the suction fan motor 9, the carriage is swung towards the right so that the rasp buffs the right-hand portion of the tread 2 of the tyre and then the adjacent portion of the right-hand sidewall S thereof. After the righthand buffing action on the tyre has been effected, the carriage is returned to a central position and retracted while the motor 5 is reversed. The carriage is then again advanced so that the template and roller 12 are re-engaged and the carriage swung to the left so that the rasp buffs the left-hand portion of the tread and the adjacent portion of the left-hand sidewall of the tyre. After the tyre has been buffed, the new overall diameter of the tyre can be read from the scale 43.