Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Tire body building type
Patent
1992-01-06
1993-10-19
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Tire body building type
156415, B29D 3026
Patent
active
052542041
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a bead locking apparatus for a tire building machine.
BACKGROUND ART
Conventionally a green tire is a toroidal assembled but non-cured tire which has been manufactured by assembling on a cylindrical tire cover on a tire building machine. The machine comprises a drum which is supported rotatably on a shaft and the diameter of the building drum can be increased and decreased to allow the tire beads to be held locked or unlocked.
In a known conventional tire building machine there is a slider which is axially reciprocable mounted on the shaft and a plurality of bead locking segments are circumferentially arranged on the outer surface of the slider. The slider and the bead lock segments are operatively connected by a mechanism by which each segment is radially displaced by axial reciprocation of the slider. However, in this type of transmission system, the link mechanism is structurally sturdy when the link is parallel to the pressure acting direction, but structurally weak when the link is skewed to the pressure acting direction.
As a result, the range of stop positions which can successfully be provided for each segment is limited and therefore it is not possible to lock beads with a very wide range of diameters. This limits the flexibility of the machine in relation to different tire sizes.
DISCLOSURE OF THE INVENTION
An object of the invention is to provide a bead locking apparatus for a tire building machine which allows locking of various diameter beads with the same power or effectiveness.
According to one aspect of the present invention a bead locking apparatus for a tire building machine comprises a slider in a form of an axially reciprocable sleeve disposed on a shaft of a tire building machine, a plurality of bead locking segments circumferentially arranged on an outer tapered surface of the slider, the bead locking segments each having an inclined inner surface, with which inner surface the bead locking segment slides on the slider tapered surface to cause a change in its radial position according to movement of the slider.
Accordingly if, for example, the slider is axially moved by a certain force provided by a cylinder device each segment is displaced radially outwardly to make an expansion. The slider may preferably be contracted by means of the contraction force of a rubber band which is set around the segments.
As a result of this mechanism, each segment slides on the slider tapered surface which it contacts by its inclined inner surface, and hence the segments change in radial height steplessly. Also the different height portions can be held positively and all portions have the same degree of support.
The radial position of each segment is determined by the axial position at which the slider is stopped which means that a change of the slider axial position caused by air pressure to the cylinder effects a change of the bead locking diameter, and this changed position is locked effectively. Thus with a fixed power in the cylinder, the work of locking various bead rings is permitted without restriction and thus providing stopless positioning.
Further, the segments move on the tapered slider surface, the contact being by the segment inner surface, and thus effective bead locking can be carried out by a fixed, unchangeable power supply irrespective of the positioning of the segments provided that the stroke of the locking diameter can match the bead diameter concerned.
Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed de
REFERENCES:
patent: 3101289 (1963-08-01), Giletta
patent: 4131500 (1978-12-01), Wilde et al.
patent: 4325764 (1982-04-01), Appleby et al.
patent: 4683021 (1987-07-01), Stalter
patent: 4812197 (1989-03-01), Wright
Miyanaga Yoshinobu
Okuda Takaaki
Ball Michael W.
Crispino Richard
Sumitomo Rubber Industries Limited
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