Wheelwright machines – Wheel holding means – Means mounted to swing between locations
Patent
1995-10-23
1997-07-22
Smith, James G.
Wheelwright machines
Wheel holding means
Means mounted to swing between locations
157 124, B60C 2500
Patent
active
056495820
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for handling vehicle wheels, particularly large tires such as tires for trucks, in order to undertake tire- or tube mendings or changings.
2. Description of the Prior Art
For these works basic different machine operations are used, namely lifting of the wheel to a rotatable position on a power-driven machine spindle, pressure of Dead breaking rollers against tire beads for bead breaking of these from the associated rim flanges while rotating the wheel, and rotating the wheel while using a stationary tire lever, which by the rotation can force the tire bead respectively inside and out over the rim flange. There are no principal problems in providing these apparatus operations, as it is a matter of rather well defined movements, of which is also made use by this invention. However, it is by the invention realized that it is possible to produce the movements in a considerably simplified way and thus bring forward a significant cheapened apparatus of the this kind.
SUMMARY OF THE INVENTION
According to the invention this is achieved by using a wheel holder chassis upstanding from a base plate and having a projecting wheel holder spindle with an associated driving gear, this chassis being tiltable on the base plate between an upstanding receiving position, in which the wheel is directly fastenable to the laterally protruding spindle, and a rearwardly slanting position, in which the mounted wheel will be free of the ground and thus be freely rotatable by means of the spindle drive. The said pressure rollers or corresponding, known pressure discs are reduced to a single roller or disc, which is mounted on a fixed carrier post such that it can be switched between a swung-out parking position, in which it will not obstruct the rearward tilting of the wheel, and a swung-in position in front of the outside of the tire edge or, respectively, behind the rear tire edge. Then the pressing free of the tire beads may be executed by the force of the mechanism tilting the carrier chassis, namely by a forward or a rearward tilting, respectively.
Thus, the required movements may be effected solely with the use of two working mechanisms, viz. for rotating the wheel holder and fur tilting the carrier chassis, respectively. The latter mechanism may in a natural manner consist of a simple working cylinder, but even the rotating can be effected by such a cylinder, viz. by means of a ratchet system designed to turn the wheel holder a whole or only a part of a revolution for each working stroke of the cylinder. Thereby the whole apparatus may be relatively very simple.
The possibility of actuating the apparatus solely by means of two air cylinders will involve that the apparatus may well be installed in or on a service car for working on the roads, which will be a new and very attractive option.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention will be described in more detail with reference to the drawings,
FIG. 1 is a perspective view of an apparatus according to the invention,
FIG. 2 is a lateral view thereof,
FIGS. 3 and 4 are perspective views of details therein,
The apparatus shown comprises a base plate 2 having a pair of upright brackets 4, between which there is pivotally mounted an upstanding carrier chassis 6, shaped as a flat box and having a projecting wheel holder spindle 8 as well as means for turning this spindle, the outer end of which is provided with a mounting head operable to receive the wheel =o be worked. The chassis bow 6 is fixed by means of a rear, inclined working cylinder 12, the piston rod 14 of which will determine the degree of slanting of the chassis 6. The slanting range is between a slightly forwardly slanted position and a position slanting some 45.degree. rearwardly. In being pivoted about the vertically upright position of the chassis 6 the wheel spindle 8 may be brought to assumed slightly upwardly and downwardly inclines positions, whereby wheels 16 within a certain diameter
REFERENCES:
patent: 4293020 (1981-10-01), Leeper et al.
patent: 4538660 (1985-09-01), Franco
patent: 5060708 (1991-10-01), Hansen
patent: 5088539 (1992-02-01), Mannen et al.
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