Wheelwright machines – Rubber tire mounting and/or demounting apparatus – For collapsing or shifting tire axially
Reexamination Certificate
2000-04-25
2001-07-10
Hail, III, Joseph J. (Department: 3723)
Wheelwright machines
Rubber tire mounting and/or demounting apparatus
For collapsing or shifting tire axially
C157S011000
Reexamination Certificate
active
06257299
ABSTRACT:
This invention relates to tyre removal machines and in particular to the means for operating the turret which supports the mounting/removal tool.
Tyre removal machines are known in which the turret supporting the mounting/removal tool is operated manually by the operator against a spring, the purpose of which is to maintain the turret in a raised position.
However, the operator is required to exert a certain force to manually operate the turret, because of which tyre removal machines have been constructed in which the turret is operated by a pneumatic cylinder-piston unit.
This latter type of machine is provided with systems which enable the turret to be positioned automatically in the correct working position. For this purpose the operator causes the turret to descend by means of a suitable push button, and when the mounting/removal tool supported by the turret touches the edge of the wheel rim, a strangling device locks the turret in its correct working position by raising it a few millimetres from the wheel rim edge.
Machines of this type operate perfectly when used on steel wheel rims, however problems arise when they are used on light alloy rims. In this respect, when the mounting/removal tool touches the edge of the wheel rim it can scratch or damage it.
Besides being unattractive, this can prejudice its seal against the tyre bead, in particular for tubeless tyres.
The object of this invention is to overcome the stated drawback within the framework of a rational, reliable and relatively low-cost solution.
The invention attains said object by providing a tyre removal machine in which the turret can be positioned either manually or automatically depending on the type of wheel rim to be subjected to tyre mounting or removal.
The particular characteristics of the invention are defined in the claims.
REFERENCES:
patent: 4196766 (1980-04-01), Leeper et al.
patent: 5836368 (1998-11-01), Corghi
Hail III Joseph J.
Societa' Italiana Costruzioni Elettromeccaniche - S.I.C.E.
Thomas David B.
LandOfFree
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