Patent GB-894051-A (GB)
Title: Improvements in or relating to tools for repairing punctures in tubeless tyres
IPC: B29C73/08
Filed: 1958-05-13
Abstract: 894,051. Plugging tyre punctures. GRUBER, O., GRUBER, W., and GRUBER, M., [trading as STAHLGRUBER O. GRUBER & CO.]. May 13, 1958, No. 15316/58. Class 144 (1). A tool for inserting vulcanizing paste and a rubber repair plug 22 into a puncture in a tubeless tyre comprises a container of vulcanizing paste with a nozzle 18 at its forward end, and a tube 24 enclosing the shank 22 of the plug slidably mounted in the tool with the mushroom head 26 of the plug bearing on the rear end of the container whereby pressure exerted on the tube 24 will force it, together with the plug, through the container to inject a first quantity of paste into the puncture followed by the head of the plug and the tube 24, means being provided in the tool to force a second quantity of paste into the tube to emerge through holes 25 in the tube wall within the tyre, Fig. 3, so that, on withdrawal of the tube 24 by the tool the paste is deposited on the inside surface of the tyre around the puncture before the head 26 abuts such surface. Figs. 2 and 3 show a nozzle ended paste container 18 carried in the forward end of a sleeve formed by telescopic sections 17, 17a, 17b and 17c, the front and rear ends of the container being closed by readily rupturable foil 20, 19, the rear end being additionally closed by an annular cup member 18a. The tube 24 extends axially of the sleeve with its rear end located in a cup 27b which, together with an annular member 28, closes the front end of a second paste container 27. The rear end of the container 27 is closed by a plate 27a on which bears the end of the sleeve 17 and which carries a pin 30 within the container overlying a readily rupturable foil base 27c of the cup 27b. In use, after the puncture hole has been reamed by a tool such as that disclosed in Specification 894,052, the nozzle 18 is applied to the puncture and the sleeve 17 pressed to force the tube 24, carrying the plug 22, through the container nozzle 18 and into the puncture hole, the head 26 of the plug forcing the paste 21 ahead of it. As the sleeve sections telescope within each other, the rim of a cup member 31 loosely surrounding the tube 24 bears on the annular closure member 28 of the rear container 27 forcing it rearwardly so that the pin 30 ruptures the foil 27c. Continued telescoping of the sleeve sections collapses the member 28 piston fashion in the container 27 to force the contents thereof into the rear end of the tube 24, and out through the holes 25, as shown in Fig. 3. In an alternative arrangement the telescopic sleeve may be replaced by a rigid open-ended sleeve, pressure on the rear container 27 being exerted by a separate member slidable within the sleeve. Fig. 4 shows a further arrangement wherein the rear container is dispensed with, the forward container comprising a sleeve 33 housing a paste-containing cartridge 34 which has a rigid fluted nozzle 39 terminating in claws 40 at its forward end. The nozzle is lined or covered with rupturable foil 36 and the rear end of the cartridge is closed by a piston cup 37 which has a radially slit central depression in its base and is lined with foil 38. The plug-carrying tube 24 extends axially of the sleeve slidably through a loose annulus 45 and a guide-sleeve 41, the rear end of the tube having additional sidewall holes 42 and being closed by a cap member 44. In use, pressure on the cap 44 first forces the tube 24 through the cartridge 34 and into the puncture, together with some of the paste 35. Coritinued pressure brings lugs 43 projecting laterally of the tube 24 to bear against the rear end of the guide sleeve 41, the lower open end of which seats in the annulus 45, and thereby move the sleeve forward until the annulus bears against the piston cup 37. Further pressure brings the cap 44 against the end 41a of the uide sleeve which is then advanced, together with the annulus 45 to squeeze the remainder of the paste 35 through the holes 42 in the tube 24 and thence out through the holes 25. In the final position, the cap 44 fits over the sleeve 33 and lugs 46 on the sleeve snap into apertures 44a in the cap whereby withdrawal of the assembly is facilitated. In a modification, the cap 44 is replaced by a pressure-plate at the end of a telescopic sleeve which surrounds the tube 24 and dispenses with the guide-tube 41.