Boots – shoes – and leggings
Patent
1997-10-24
1999-11-09
Grant, William
Boots, shoes, and leggings
157 126, 157 128, G06F 1700, B60C 25135, B60C 25138
Patent
active
059800836
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a machine for positioning tyre beads. It also relates to a method using said machine.
The conditions in which tires are required to travel are becoming more and more harsh, and whatever said conditions the beads of a tire have to be positioned correctly on the seats of the mounting rim thereof. The clamping thereof on seats is becoming more and more important, and the mounting of a tire on its rim is becoming more and more difficult, even when mounting machines are used. The poor mounting operations which are observed result in defective positioning of the beads, with the bead seats not bearing on the rim seats over their entire surfaces. These defective positioning operations may cause dislodging of beads if the case arises.
In order to be able to deliver to vehicle manufacturers only mounted assemblies in which the tires have beads which have been correctly positioned, Japanese application 64/03683 describes a method for positioning tire beads which consists in exerting a pressure on the two sidewalls of the inflated tire, so as to detach the beads from the rim flanges and seats, the internal pressure of the tire correctly repositioning them as soon as the pressure force on the sidewalls is removed. The devices provided for applying such a pressure to the sidewalls comprise either two rings, each ring being placed on one side of the tire, or rollers, each roller effecting a circular path on each sidewall of the tire.
Such a device is advantageous when effecting the positioning of tyre beads of the same dimension or at least of tires having maximum axial widths of rotation. Given the multiplicity of dimensions of existing tires and wheels, the increase in the number of dimensions created, and given the multiplicity of structures used in said dimensions and the multiplicity of the stiffness of sidewalls which results therefrom, the known devices do not permit rational, economic use for the finishing of mounted assemblies which can be delivered to the manufacturers.
SUMMARY OF THE INVENTION
In order to overcome the above disadvantages, the machine for correctly positioning the beads of a tire mounted on its operating rim and inflated and using the principle consisting in applying a compressive load to each sidewall of said tire is characterised, according to the invention, in that it comprises two plates, one upper and one lower, respectively, each provided with at least two coaxial cylindrical rings of different diameters and axially movable independently, and also means which, according to the dimension of the tire of the mounted assembly to be treated, permit firstly the selection from among all the upper and lower rings of the appropriate two rings respectively of the upper plate and the lower plate, and secondly the adjustment of the axial distance between the two rings selected, acting on the opposite sidewalls of the tire, which distance is necessary and sufficient for the desired compression of said sidewalls.
"Axial direction" is to be understood to mean the common direction of the axes of the cylindrical rings, which is also the direction of the axis of the mounted assembly to be treated.
The means permitting the selection and adjustment may first and foremost be means for identifying the mounted assembly to be treated. These means may be visual and human, but they may also consist of a reading system which permits the decoding of a code applied to the tire or introduced in the interior of the tire and/or of the rim, or a system permitting the recognition of dimensional measurements.
The device will advantageously comprise a central processing and control unit. The means of this unit for processing the data, obtained by reading, for example, are means for receiving and comparing the data collected with pre-established, stored implementation data of the device. These pre-established data are in particular the identification of the rings which it is necessary to select, and also the axial distance between the lower ring and the upper r
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patent: 4947919 (1990-08-01), Timlin
patent: 5141040 (1992-08-01), Curcuri
patent: 5267380 (1993-12-01), Ronge et al.
patent: 5659478 (1997-08-01), Pennisi et al.
Patte Bernard
Wrobel Antoine
Calcano Ivan
Compagnie Generales des Etablissements Michelin - Michelin & CIE
Grant William
LandOfFree
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