Automatic device for mounting and dismounting tires
An automatic device ( 1 ) for mounting and dismounting a tire ( 100 ) onto/from the rim ( 201 ) of a wheel ( 120 ) associated with a tire-dismounting machine ( 100 ) comprising a lower base ( 101 ) on which are associated rotating support and locking means ( 102 ) of the rim ( 201 ) of a wheel, a pole ( 103 ) extending vertically associated with said base ( 101 ), a horizontal support arm ( 104 ) associated with said pole ( 103 ), said device comprising a mobile shaft ( 2 b ) that can slide vertically inside a pipe ( 2 ) supported so that it can slide horizontally on said arm ( 104 ), an articulated quadrilateral made up of a tire-dismounting tool ( 4 ), a pair of opposite connecting rods ( 13, 14 ) and a body ( 6 ) fixed to the lower end of the mobile shaft ( 2 b ), and a manoeuvring lever ( 7 ) articulated with said quadrilateral and suitable for deforming it to transmit the roto-translating motion to the tool ( 4 ) that goes from a seeking configuration to an extraction configuration of the bead ( 202 ′) from the rim ( 201 ).
1. Automatic device ( 1 ) for mounting and dismounting a tire ( 100 ) onto/from the rim ( 201 ) of a wheel ( 120 ) associated with a tire-dismounting machine ( 100 ) comprising a lower base ( 101 ) on which are associated rotating support and locking means ( 102 ) of the rim ( 201 ) of a wheel, a pole ( 103 ) extending vertically associated with said base ( 101 ), a horizontal support arm ( 104 ) associated with said pole ( 103 ), characterised in that it comprises a mobile shaft ( 2 b ) that can slide vertically inside a pipe ( 2 ) supported so that it can slide horizontally on said arm ( 104 ), an articulated system ( 3 ) comprising an articulated quadrilateral made up of a tire-dismounting tool ( 4 ), a pair of opposite connecting rods ( 13 , 14 ) and a body ( 6 ) to which said connecting rods ( 13 , 14 ) are articulated, said body ( 6 ) being fixed to the lower end of the mobile shaft ( 2 b ), and a manoeuvring lever ( 7 ) articulated with said quadrilateral and suitable for deforming it to transmit the roto-translating motion to the tool ( 4 ) that goes from a seeking configuration to an extraction configuration of the bead ( 202 ′) from the rim ( 201 ).
2. Device ( 1 ) according to claim 1 , wherein said manoeuvring lever ( 7 ) cooperates in abutment with said articulated quadrilateral through a gear comprising a first toothed wheel sector ( 8 ) and a second toothed wheel sector ( 9 ) intermeshed with each other.
3. Device ( 1 ) according to claim 2 , wherein said manoeuvring lever ( 7 ) is commanded by a cylinder-piston group ( 5 ).
4. Device ( 1 ) according to claim 3 , wherein said manoeuvring lever ( 7 ) has a first end ( 7 ′) hinged through a first articulation pin ( 10 ) to the end of the stem ( 5 a ) of said cylinder-piston group ( 5 ) and a second end ( 7 ″) fitted onto a first rotation shaft ( 11 ).
5. Device ( 1 ) according to claim 4 , wherein said first toothed wheel sector ( 8 ) is fitted onto said first rotation shaft ( 11 ).
6. Device ( 1 ) according to claim 2 , wherein said connecting rods ( 13 , 14 ) are respectively fitted onto a second rotation shaft ( 15 ) and a third rotation shaft ( 16 ).
7. Device ( 1 ) according to claim 6 , wherein said second toothed wheel sector ( 9 ) is fitted onto said second rotation shaft ( 15 ).
8. Device ( 1 ) according to claim 2 , wherein said articulated quadrilateral and said first toothed wheel sector ( 8 ) and second toothed wheel sector ( 9 ) lie substantially on the same plane, said plane being parallel to the plane on which said manoeuvring lever ( 7 ) lies.
9. Device ( 1 ) according to claim 1 , wherein said tool ( 4 ) has a hook-shaped appendix ( 4 a ).
10. Device ( 1 ) according to claim 1 , wherein said body ( 6 ) comprises a bead-guide ( 20 ).