Wheelwright machines – Rubber tire mounting and/or demounting apparatus – For collapsing or shifting tire axially
Reexamination Certificate
1998-10-13
2001-02-06
Smith, James G. (Department: 3723)
Wheelwright machines
Rubber tire mounting and/or demounting apparatus
For collapsing or shifting tire axially
C157S001240
Reexamination Certificate
active
06182735
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a device for fitting and removing a tire on/from a wheel rim, in particular of cars, motor bikes, etc.
In particular, the invention concerns a device to assist in the fitting and removal in case of very rigid tires, for example such as thin sports tires.
2. Description of the Related Art
For fitting and removing tires on/from a wheel rim, known devices are used provided with a turntable containing elements for tightening the wheel and with a support equipped with a tool that can be positioned at the height of the top edge of the wheel rim and containing a part in which can be provided a lever that can be placed between the wheel rim and the tire, as well as a guiding element for the tire.
In order to remove a tire from a wheel rim, it is known that one has to push the tire bead in a conventional outer groove of the wheel rim, after which the above-mentioned lever can be placed between the wheel rim and the tire.
Certain tires, in particular thin sports tires, are disadvantageous in that the sides are very rigid and in that the beads cannot be pushed in said groove without some extra force being exerted.
A device for exerting this extra force is known from document EP 0.649.763 of applicant and comprises a lever provided with a pressure element, whereby this lever is detachable, such that it can be mounted on any of the two supports, so that said pressure element can either rest on the bead and/or the inner side or on the bead and/or the top side of the tire.
Thus, this known device is disadvantageous in that said lever has to be moved from one support to another depending on the bead and/or the side being used, which is not very practical.
SUMMARY OF THE INVENTION
The invention aims a device which does not have said disadvantage.
To this end, the invention concerns a device for fitting and removing a tire to/from a wheel, working in conjunction with an instrument containing a turntable provided with elements for tightening the wheel rim, and with a tool which can be positioned at the height of the top edge of the wheel rim mounted on the table, whereby said device contains a lever with at least one pressure element which makes it possible to exert a pressure on the bead and/or side of the tire, such that the lever is fixed in a mobile manner, in particular in a revolving manner, to a support which is fixed in relation to the instrument, by a unique coupling system which makes it possible to move the lever between a first position in which the pressure element can exert a pressure on one of the beads or sides of a tire surrounding a wheel rim mounted on the table of the above-mentioned instrument, and a second position in which the pressure element can exert a pressure on the other bead and/or side of said tire.
Preferably, the coupling element contains a swivel arm fixed in a revolving manner to the support, whereby the above-mentioned lever contains the pressure element which is in turn linked to the swivel arm in a revolving manner.
The coupling system can be made such that the angle between the rod and the rotating table is different for said two lever positions.
REFERENCES:
patent: 91 01 930 (1991-06-01), None
patent: 0 649 763 A1 (1995-04-01), None
Bacon & Thomas PLLC
Smith James G.
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