Device for lifting a bottom side wall of a tyre in a tyre removing machine
A device for lifting the bottom side wall ( 7 b ) of the tire ( 7 ) in a tire removing machine comprises a frame ( 10 ), an arm ( 16 ) rotatably associated with the frame ( 10 ) at a first end of it ( 16 a ) to rotate between an angular rest position and an angular working position. A supporting element ( 18 ) is connected to a second end ( 16 b ) of the arm ( 16 ) to support a bottom side wall ( 7 b ) of a tire ( 7 ) when the arm ( 16 ) is in the working position. The device also comprises an arm ( 16 ) rotation stop member ( 20 ) operatively positioned between the arm ( 16 ) and the frame ( 10 ) and able to be activated to prevent the arm ( 16 ) from turning relative to the frame ( 10 ) at least at the angular working position.
1. A device for lifting a bottom side wall ( 7 b ) of a tyre ( 7 ) in a tyre removing machine ( 1 ) where the wheel ( 5 ) being processed is positioned with its axis vertical, the device comprising:
a frame ( 10 );
an arm ( 16 ) rotatably associated with the frame ( 10 ) at a first end ( 16 a ) of the arm ( 16 ) to rotate around an axis (F) parallel to the wheel ( 5 ) axis between an angular rest position and an angular working position;
a supporting element ( 18 ) connected to a second end ( 16 b ) of the arm ( 16 ) and designed to interact with the bottom side wall ( 7 b ) of the tyre ( 7 ), in order to lift it, when the arm ( 16 ) is in the working position,
wherein it comprises an arm ( 16 ) rotation stop member ( 20 ) configured to hold the arm ( 16 ) in place at a certain angular position relative to the frame ( 10 ) at least when it is at the angular working position and to impede the arm ( 16 ) rotation around said axis (F), wherein the stop member ( 20 ) comprises a brake ( 21 ).
2. The device according to claim 1 , wherein the stop member ( 20 ) is adapted to stop the arm ( 16 ) at any angular position that it can adopt relative to the frame ( 10 ).
3. The device according to claim 1 , wherein the brake ( 21 ) is mounted integrally on the arm ( 16 ).
4. The device according to claim 1 , wherein the brake ( 21 ) is engageable with a pin ( 17 ) on the frame ( 10 ).
5. The device according to claim 1 , wherein the frame ( 10 ) comprises a pin ( 17 ) which the first end ( 16 a ) of the arm ( 16 ) is pivoted to, the brake ( 21 ) comprising a clamp ( 22 ) placed at least partly around the pin ( 17 ) and able to be selectively changed over between an open configuration, where it is disengaged from the pin ( 17 ), and a closed configuration, where it is tightened round the pin ( 17 ) to prevent the arm ( 16 ) from turning.
6. The device according to claim 5 , wherein the brake ( 21 ) comprises a linear actuator ( 23 ) for moving a first jaw ( 22 a ) and a second jaw ( 22 b ) of the clamp ( 22 ) towards each other in order to change the clamp ( 22 ) over from the open configuration to the closed configuration and vice versa.
7. The device according to claim 6 , wherein the linear actuator comprises a containment body ( 24 ) and a plunger ( 25 ) that slides inside the containment body ( 24 ) along its working axis (D), said containment body ( 24 ) extending mainly in a plane (E) transversal to the working axis (D) of the plunger ( 25 ).
8. The device according to claim 1 , comprising a handgrip lever ( 29 ) fixed integrally to the arm ( 16 ) and extending away from the arm ( 16 ) to allow an operator to move the arm ( 16 ) between the angular rest position and the angular working position.
9. The device according to claim 1 , comprising movement means ( 14 ) for moving the arm ( 16 ) and adapted to lift the supporting element ( 18 ) from a lowered position to a raised position where it operates on the bottom side wall ( 7 b ) of the tyre in order to lift it.
10. The device according to claim 1 , wherein the supporting element ( 18 ) comprises a disc shaped member ( 19 ) shaped in such a way as to form a convex surface ( 19 c ) for supporting the tyre ( 7 ) and an axis of rotation (C) inclined at an angle to the vertical in such a way that the peripheral portion ( 19 b ) of the convex surface on which the tyre ( 7 ) rests is substantially horizontal and parallel to the bottom side wall ( 7 b ) of the tyre ( 7 ).
11. The device according to claim 1 , wherein the arm ( 16 ) has a telescopic structure.
12. A tyre removing machine ( 1 ) adapted to support a wheel ( 5 ) positioned with its axis vertical and comprising a device for lifting a bottom side wall ( 7 b ) of a tyre ( 7 ) of the wheel ( 5 ), wherein said device is a device according to claim 1 .
13. A method for removing a tyre ( 7 ) of a wheel ( 5 ) from a corresponding rim, comprising the following steps:
positioning the wheel on, and fastening it to, a supporting means ( 2 ) in such a way that its axis is vertical;
lifting a bottom side wall ( 7 b ) of the tyre ( 7 ) using a supporting element ( 18 ) connected to an arm ( 16 ) rotatably associated with a frame ( 10 ) of the tyre removing machine ( 1 ) around an axis (F) parallel to the wheel axis to allow a tool to be inserted between a bottom bead ( 8 b ) of the tyre and the rim ( 6 );
turning the wheel ( 5 ) about its axis in order to extract the bottom bead ( 8 b ) from the rim ( 6 ), said lifting step comprising the following sub-steps:
turning the arm ( 16 ) around said axis (F) from a rest position, where the supporting element ( 18 ) is in a position of non-interference with respect to the tyre ( 7 ), to a working position, where the supporting element ( 18 ) has at least one portion under the bottom side wall ( 7 b ) of the tyre ( 7 );
moving the supporting element ( 18 ) upwards, wherein the lifting step comprises a further sub-step, intermediate between the turning and movement steps, of stopping the rotation of the arm ( 16 ), by actuating a brake ( 21 ) operatively active on the arm, when the arm ( 16 ) is at the working position in such a way as to prevent angular movements of the arm ( 16 ) around said axis (F) until the stopping step is terminated.
14. A device for lifting a bottom side wall ( 7 b ) of a tyre ( 7 ) in a tyre removing machine ( 1 ) where the wheel ( 5 ) being processed is positioned with its axis vertical, the device comprising:
a frame ( 10 );
an arm ( 16 ) rotatably associated with the frame ( 10 ) at a first end ( 16 a ) of the arm ( 16 ) to rotate around an axis (F) parallel to the wheel ( 5 ) axis between an angular rest position and an angular working position;
a supporting element ( 18 ) connected to a second end ( 16 b ) of the arm ( 16 ) and designed to interact with the bottom side wall ( 7 b ) of the tyre ( 7 ), in order to lift it, when the arm ( 16 ) is in the working position;
an arm ( 16 ) rotation stop member ( 20 ) configured to hold the arm ( 16 ) in place at a certain angular position relative to the frame ( 10 ) at least when it is at the angular working position and to impede the arm ( 16 ) rotation around said axis (F);
a handgrip lever ( 29 ) fixed integrally to the arm ( 16 ) and extending away from the arm ( 16 ) to allow an operator to move the arm ( 16 ) between the angular rest position and the angular working position.
15. A device for lifting a bottom side wall ( 7 b ) of a tyre ( 7 ) in a tyre removing machine ( 1 ) where the wheel ( 5 ) being processed is positioned with its axis vertical, the device comprising:
a frame ( 10 );
an arm ( 16 ) rotatably associated with the frame ( 10 ) at a first end ( 16 a ) of the arm ( 16 ) to rotate around an axis (F) parallel to the wheel ( 5 ) axis between an angular rest position and an angular working position;
a supporting element ( 18 ) connected to a second end ( 16 b ) of the arm ( 16 ) and designed to interact with the bottom side wall ( 7 b ) of the tyre ( 7 ), in order to lift it, when the arm ( 16 ) is in the working position,
wherein it comprises an arm ( 16 ) rotation stop member ( 20 ) configured to hold the arm ( 16 ) in place at a certain angular position relative to the frame ( 10 ) at least when it is at the angular working position and to impede the arm ( 16 ) rotation around said axis (F),
wherein the supporting element ( 18 ) comprises a disc shaped member ( 19 ) shaped in such a way as to form a convex surface ( 19 c ) for supporting the tyre ( 7 ) and an axis of rotation (C) inclined at an angle to the vertical in such a way that the peripheral portion ( 19 b ) of the convex surface on which the tyre ( 7 ) rests is substantially horizontal and parallel to the bottom side wall ( 7 b ) of the tyre ( 7 ).
16. A device for lifting a bottom side wall ( 7 b ) of a tyre ( 7 ) in a tyre removing machine ( 1 ) where the wheel ( 5 ) being processed is positioned with its axis vertical, the device comprising:
a frame ( 10 );
an arm ( 16 ) rotatably associated with the frame ( 10 ) at a first end ( 16 a ) of the arm ( 16 ) to rotate around an axis (F) parallel to the wheel ( 5 ) axis between an angular rest position and an angular working position;
a supporting element ( 18 ) connected to a second end ( 16 b ) of the arm ( 16 ) and designed to interact with the bottom side wall ( 7 b ) of the tyre ( 7 ), in order to lift it, when the arm ( 16 ) is in the working position,
wherein it comprises an arm ( 16 ) rotation stop member ( 20 ) configured to hold the arm ( 16 ) in place at a certain angular position relative to the frame ( 10 ) at least when it is at the angular working position and to impede the arm ( 16 ) rotation around said axis (F), wherein the arm ( 16 ) has a telescopic structure.