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US 8,910,693 B2Granted
Device for demounting a tire from a rim as well as a tire demounting machine equipped with such device
AssigneeButler Engineering and Marketing S.P.A.
InventorsTullio Gonzaga, Silvano Santi
Life of this patent
Estimating the term…
Abstract
The present invention relates to a device for demounting a tire (T) from a rim (W) including at least one support element; an articulation pin element borne by the at least one support element; a spring shackle element having a first end and a second end articulated on the articulation pin; a demounting lever; an actuator borne by the at least one support element and set to act on the demounting lever in order to make the demounting lever angularly move during use; and friction or elastic loading means designed to slow the angular movement of the spring shackle element around the articulation pin with respect to its angular movement around the first axis (x-x).
Claims25
A device for demounting a tire from a rim, comprising:
- at least one support element;
- an articulation pin element borne by said at least one support element;
- a spring shackle element having a first end and a second end articulated on said articulation pin;
- a demounting lever having a substantially hook-like distal end and a proximal end that can be articulated at a first articulation axis to said first end of said spring shackle element and at a second articulation axis parallel to the first articulation axis, said first and said second articulation axis being substantially parallel to said articulation pin;
- and
- an actuator borne by said at least one support element and set to act on said second articulation axis of said demounting lever in order to make said demounting lever angularly move during use around said first articulation axis and make said spring shackle element angularly move around said articulation pin, such that after the driving of said actuator in one direction, said lever is obliged to follow a first path or insertion path, while by driving said actuator in the reverse direction, said demounting lever is obliged to follow a reverse or extraction path, different from said first path;
- comprising elastic loading means at the articulation around said articulation pin of said second end of said spring shackle element, designed to slow the angular movement of said spring shackle element around said articulation pin with respect to its angular movement around said first axis.
4 more elements
A process for demounting a tire from a rim, comprising the following steps:
- providing a device for demounting a tire from a rim, comprising:
- at least one support element;
- an articulation pin element borne by said at least one support element;
- a spring shackle element having a first end and a second end articulated on said articulation pin;
- a demounting lever having a substantially hook-like distal end and a proximal end that can be articulated at a first articulation axis to said first end of said spring shackle element and at a second articulation axis parallel to the first articulation axis, said first and said second articulation axis being substantially parallel to said articulation pin;
- and
- an actuator borne by said at least one support element and set to act on said second articulation axis of said demounting lever in order to make said demounting lever angularly move during use around said first articulation axis and make said spring shackle element angularly move around said articulation pin, such that after the driving of said actuator in one direction, said lever is obliged to follow a first path or insertion path, while by driving said actuator in the reverse direction, said demounting lever is obliged to follow a reverse or extraction path, different from said first path;
- elastic loading means at the articulation around said articulation pin of said second end of said spring shackle element, designed to slow the angular movement of said spring shackle element around said articulation pin with respect to its angular movement around said first axis,
- bead breaking a first bead of the tire;
- arranging said demounting device at a first flank of said rim corresponding with said first bead, so as to bring said distal end of said demounting lever to a first edge of said rim;
- commanding said linear actuator, so as to determine an angular advancement course of said demounting lever towards a position of penetration of its distal end between the edge of the rim and the tire, until it internally engages a portion of the tire bead close to the rim at the advancement end stop, and to carry out a reverse course in order to deform a portion of the tire bead, moving it away from the edge of the rim before dragging it off the rim for the demounting, said advancement course being different from said reverse course;
- and
- completing the demounting by rotating said rim or said device.
10 more elements
Dependencies are inferred from the claim text.