Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Tire body building type
Reexamination Certificate
1999-09-02
2001-11-20
Knable, Geoffrey L. (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Tire body building type
C156S414000
Reexamination Certificate
active
06318434
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a tire building drum with turn-up apparatus for building an unvulcanized tire with tire components of rubber or having reinforcement cords and two bead cores with high bead filling strips, said tire building drum having a central axis, two ring segments placed around the axis and spaced from each other each to support a bead core, drum segments placed around the axis and on the outside of each of the ring segments, which drum segments define a cylindrical surface to support tire components, means to radially expand that part of the tire components which is situated between the ring segments, the tire building drum having on both sides outside the ring segments a first set of axially extending, hingeable arms, each arm having an end directed at the ring segment, said end having a roller, means to axially and radially move each first set of arms from a first position in which the rollers of a first set of arms form a virtually closed ring to a second position in order to press the expanded part of the tire components which is situated between the ring segments to the part of the tire components which is situated outside the ring segments.
Such a tire building drum with turn-up apparatus is already known from British patent specification 1.532.960. This known tire building drum comprises two sets of arms, one set on one side outside of the ring segments and the other set on the other side outside of the ring segments. When moving the arms from the first position to the second position, rollers are brought at a greater distance from the axis, as a result of which the rollers are distanced from each other and thus do not form a virtually closed ring any more. Because the second position is a little distance further from the central axis of the tire building drum than the first position, the part of the tire components situated outside the ring segments is not fully pressed over the total height to the part of the tire components situated between the ring segments, and furthermore the ends of the arms come to stand at a distance from each other so that an incomplete circumferential pressure by the rollers is obtained. In order to prevent an incomplete attachment of the tire components, which may be detrimental to the quality of the tire to be produced, a sleeve of rubber is applied around the arms. Such a sleeve of rubber however, has a limited life span.
SUMMARY OF THE INVENTION
The object of present invention is to provide a tire building drum with turn-up apparatus for building an unvulcanized tire with tire components of rubber or having reinforcement cords and two bead cores with high bead filling strips, wherein without the use of a rubber sleeve the parts of the tire components can be pressed to one another over their full circumference and their full height, so that the final quality of the tire to be produced is improved.
For this purpose a tire building drum with turn-up apparatus of the kind described above is according to the invention characterized in that each first set of arms contains a second set of axially extending, hingeable arms, each arm having an end directed at the ring segment, said end having a roller, each roller of an arm of the second set being situated between two adjacent arms of said first set and being situated on the side of the rollers of the arms of said first set which side is turned away from the ring segments, and that means are provided to axially and radially move each second set of arms from a first position, in which the rollers of a second set of arms form a virtually closed ring to a second position in order to press the expanded part of the tire components which is situated between the ring segments to the part of the tire components which is situated outside the ring segments. Because the rollers of the arms of the second set are situated between the arms of the first set, at least almost the entire circumference of the tire component parts is pressed to one another in the second position of the rollers of both sets, as a result of which an at least almost complete attachment of the tire components is obtained.
A preferred embodiment of a tire building drum with turn-up apparatus according to present invention is characterized in that the means to axially and radially move each first set of arms and the means to axially and radially move each second set of arms are formed by the same means. In this way the turn-up apparatus of the tire building drum cannot only be manufactured in a more compact design, but also moving the sets of arms from the first position to the second position is synchronized in a simple way.
A further preferred embodiment of a tire building drum with turn-up apparatus according to the invention is characterized in that means are provided for laterally supporting the two bead cores with high bead filling strips, wherein the means are situated between the ring segments and preferably are pivotable from a non-working position to a working position. In this way it is prevented that when the arms are going from the first position to the second position, the arms push the bead cores with high bead filling strips from their places. When the means are pivotable from a non-working position to a working position, the normal working of the tire building drum is not detrimentally influenced.
REFERENCES:
patent: 3692605 (1972-09-01), Cantarutti
patent: 3887423 (1975-06-01), Gazuit
patent: 4131500 (1978-12-01), Wilde et al.
patent: 4362592 (1982-12-01), Ruppel
patent: 5181982 (1993-01-01), Kumagai et al.
patent: 5500066 (1996-03-01), Remond
patent: 5660677 (1997-08-01), Remond
patent: 5706770 (1998-01-01), Schmidt et al.
patent: 216895 (1982-11-01), None
patent: 216897 (1982-11-01), None
patent: 2 124 978 (1971-12-01), None
patent: 4416514 (1994-11-01), None
patent: 0 459 728 (1991-12-01), None
patent: 0 637 505 (1995-02-01), None
patent: 2 294 043 (1976-07-01), None
patent: 1 532 960 (1978-11-01), None
patent: 2 081 189 (1982-02-01), None
patent: 2 182 894 (1987-05-01), None
patent: 1599244 (1990-10-01), None
patent: 717851 (1991-01-01), None
Bierens Franciscus Cornelis
Gutknecht Heinz
Knable Geoffrey L.
Pennie & Edmonds LLP
VMI Epe Holland B.V.
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