Tire bead demounting apparatus

Claim 2

A tire bead demounting apparatus for use in connection with a tire rim having an angular tire retaining section with an interior tire bead bearing surface and an opposite exterior surface, and a tire installed on said rim having a side wall terminating in a bead situated adjacent and in sealing relationship to said interior surface, said apparatus including: a jaw assembly having a first jaw and a second jaw opposed to and movably connected to the first jaw for movement between an open position wherein said first and second jaws are spaced apart from each other, and a closed position whereIn said first and second jaws are relatively closer to each other; a yoke pivotally connected to the second jaw; a first hydraulic motor of the type having a cylinder portion and a piston-rod portion movable inwardly and outwardly relative to the cylinder portion to move said jaws from said open position toward said closed position; one portion of said first hydraulic motor being connected to said yoke, the other portion of said first hydraulic motor being connected to the first jaw whereby upon actuation of the first hydraulic motor the piston-rod portion moves outwardly of the cylinder portion to move the jaws toward the closed position; said second jaw having a configuration adapted to bear against the exterior surface of the tire retaining section of the tire rim; said first jaw having a wedge configuration adapted to be lodged between and relatively displace said bead and said interior surface of the tire retaining section of the tire rim when the second jaw is bearing against the exterior surface and said first power means is actuated to move the jaws toward said closed position; plunger means having a plunger head in alignment with the first jaw and movable with the first jaw toward said closed position; said plunger head being extendible outward from the first jaw toward the tire side wall when the wedge configuration of the first jaw is lodged between said bead and said interior surface of the tire retaining section of the tire rim; a second hydraulic motor of the type having a cylinder portion and a piston-rod portion movable inwardly and outwardly relative to the cylinder portion, one portion of said second hydraulic motor being connected to the first jaw, the other portion of said second hydraulic motor being connected to the plunger means whereby upon actuation of the second hydraulic motor the piston-rod portion is moved outwardly of the cylinder portion to extend said plunger head outward against said tire side wall when the wedge configuration of the first jaw is lodged between said bead and said interior surface; valve means operably connected to the first hydraulic motor and the second hydraulic motor for independent actuation of each hydraulic motor; said valve means having control means successively movable between a first position to actuate the first hydraulic motor, a second position to actuate the second hydraulic motor, and a third position to release both the first and second hydraulic motors.

Claim 3

The tire bead demounting apparatus of claim 1 including: bias means associated with the first hydraulic motor biasing the piston-rod portion inwardly of the cylinder portion.

Claim 4

The tire bead demounting apparatus of claim 1 including: bias means normally biasing the piston-rod portion of the second hydraulic motor inwardly of the cylinder portion.

Claim 5

A tire bead demounting apparatus for disengaging a tire side wall and bead from a tire rim of the type having an outwardly extended ledge and a radial flange extended from said ledge, said ledge and flange engaging the tire bead, said apparatus including: a jaw assembly having a first pair of jaw members and a second pair of jaw members pivotally connected to the first pair of jaw members; said first jaw members and said second jaw members being pivotally movable between an open position wherein the jaw assembly is open and a closed position wherein the jaw assembly is closed; first power means operable to close the jaw assembly constituted as a first hydraulic motor of the type having a cylinder portion and a piston-rod portion movable inwardly and outwardly of the cylinder portion; a yoke pivotally connected to the second jaw members; one portion of said first hydraulic motor being connected to said yoke; the other portion of said first hydraulic motor being connected to said first jaw members whereby the jaw assembly is closed when said first hydraulic motor is actuated to move the piston-rod portion outwardly oF the cylinder portion; said first jaw members having flat forward surfaces terminating in wedges directed toward the second jaw members adapted to lodge between and relatively displace said bead and said radially extended flange of said tire rim upon closure of the jaw assembly with said second jaw members bearing against said ledge whereby the first and second jaw members embrace the flange and ledge; plunger means associated with the first pair of jaw members including a plunger head located between said first jaw members having a flat forward surface normally in substantial alignment with the forward surfaces of the first pair of jaw members and extendible outward therefrom toward the tire side wall when the wedges of the first jaw members are lodged between the bead and the radially extended flange of the tire rim to exert a perpendicular force against the tire side wall and disengage it from the tire rim; second power means operable to outwardly extend said plunger head, constituted as a second hydraulic motor of the type having a cylinder portion and a piston-rod portion movable inwardly and outwardly of the cylinder portion; one portion of the second hydraulic motor being connected to the plunger head; the other portion of said second hydraulic motor being connected to the first pair of jaw members whereby upon actuation of the second hydraulic motor to move the piston-rod portion outwardly of the cylinder portion, the plunger head is outwardly extended from the first jaw members; valve means operably connected to the first and second hydraulic motors for independent actuation thereof and adapted to receive hydraulic fluid under pressure from a remote hydraulic fluid source; and valve control means located on the valve means for controlling said valve means and sequentially movable between a first position actuating the first hydraulic motor and a second position actuating the second hydraulic motor and a third position to release both hydraulic motors.

Claim 6

A tire bead demounting apparatus for disengaging a tire side wall and bead from a tire rim of the type having an outwardly extended ledge and a radial flange extended from said ledge, said ledge and flange engaging the tire bead, said apparatus including: a jaw assembly having a first pair of jaw members and a second pair of jaw members pivotally connected to the first pair of jaw members; said first jaw members and said second jaw members being pivotally movable between an open position wherein the jaw assembly is open and a closed position wherein the jaw assembly is closed; first power means operable to close the jaw assembly constituted as a first hydraulic motor of the type having a cylinder portion and a piston-rod portion movable inwardly and outwardly of the cylinder portion; a yoke pivotally connected to the second jaw members; one portion of said first hydraulic motor being connected to said yoke; the other portion of said first hydraulic motor being connected to said first jaw members whereby the jaw assembly is closed when said first hydraulic motor is actuated to move the piston-rod portion outwardly oF the cylinder portion; said first jaw members having flat forward surfaces terminating in wedges directed toward the second jaw members adapted to lodge between and relatively displace said bead and said radially extended flange of said tire rim upon closure of the jaw assembly with said second jaw members bearing against said ledge whereby the first and second jaw members embrace the flange and ledge; plunger means associated with the first pair of jaw members including a plunger head located between said first jaw members having a flat forward surface normally in substantial alignment with the forward surfaces of the first pair of jaw members and extendible outward therefrom toward the tire side wall when the wedges of the first jaw members are lodged between the bead and the radially extended flange of the tire rim to exert a perpendicular force against the tire side wall and disengage it from the tire rim; second power means operable to outwardly extend said plunger head, constituted as a second hydraulic motor of the type having a cylinder portion and a piston-rod portion movable inwardly and outwardly of the cylinder portion; one portion of the second hydraulic motor being connected to the plunger head; the other portion of said second hydraulic motor being connected to the first pair of jaw members whereby upon actuation of the second hydraulic motor to move the piston-rod portion outwardly of the cylinder portion, the plunger head is outwardly extended from the first jaw members; valve means operably connected to the first and second hydraulic motors for independent actuation thereof and adapted to receive hydraulic fluid under pressure from a remote hydraulic fluid source; and valve control means located on the valve means for controlling said valve means and sequentially movable between a first position actuating the first hydraulic motor and a second position actuating the second hydraulic motor and a third position to release both hydraulic motors.

Claim 7

A tire bead demounting apparatus for use in connection with a tire rim having an outwardly extended ledge and a radial flange extending from said ledge, and a tire installed on said rim and having a side wall and a bead terminating said side wall and situated adjacent said ledge and in sealing relation to said flange; said apparatus including: a jaw assembly including at least one first jaw member having a working face and at least one second jaw member in opposed relation to and movably connected to the first jaw member for movement between an open position wherein said members are spaced from each other and a closed position wherein said members are relatively closer to each other; first power means to move said members from said open position toward said closed position; a frame member pivotally connected to the second jaw member, said first power means including a hydraulic motor of the type having a cylinder portion and a piston-rod portion movable inwardly and outwardly relative to the cylinder portion; one portion of the first hydraulic motor being connected to said frame member, the other portion of said hydraulic motor being connected to the first jaw member whereby upon actuation of the first hydraulic motor the piston-rod portion moves outwardly of the cylinder portion to move the jaw members toward the closed position; plunger means movable with said first member and including a plunger head having a working face normally located adjacent and substantially in the same plane as the working face of said first jaw member, said plunger means being also movable from a first position wherein said plunger working face is in said normal position to a second position wherein said plunger working face extends outwardly from the plane of said first jaw member working face; second power means to move said plunger means from said first position toward said second position; said second power means including a second hydraulic motor of the type having a cyLinder portion and a piston-rod portion movable inwardly and outwardly of the cylinder portion; one portion of the second hydraulic motor being connected to the first jaw member; the other portion of the second hydraulic motor being connected to the plunger means whereby upon actuation of the second hydraulic motor the piston rod portion is moved outwardly of the cylinder portion and the plunger head is extended outward from said first position toward said second position; said first jaw member being of configuration to attain position between said tire wall and bead on the one hand and said radial flange on the other when said jaw member working face is positioned against said tire wall and said second jaw member is situated in contact with said ledge; said second jaw member being of configuration to attain a bearing relation to said ledge when said working face of said first jaw member is in contact with said tire wall; valve means operably connected to the first and second hydraulic motors for independent actuation thereof and adapted to receive hydraulic fluid under pressure from a remote hydraulic fluid source; and valve control means located on the valve means for controlling said valve means, sequentially movable between a first position actuating the first hydraulic motor and a second position actuating the second hydraulic motor, and a third position to release both hydraulic motors.

Claim 8

A tire bead demounting apparatus for use in connection with a tire rim having an outwardly extended ledge and a radial flange extending from said ledge, and a tire installed on said rim and having a side wall and a bead terminating said side wall and situated adjacent said ledge and in sealing relation to said flange; said apparatus including: a jaw assembly including at least one first jaw member having a working face and at least one second jaw member in opposed relation to and movably connected to the first jaw member for movement between an open position wherein said members are spaced from each other and a closed position wherein said members are relatively closer to each other; first power means to move said members from said open position toward said closed position; a frame member pivotally connected to the second jaw member, said first power means including a hydraulic motor of the type having a cylinder portion and a piston-rod portion movable inwardly and outwardly relative to the cylinder portion; one portion of the first hydraulic motor being connected to said frame member, the other portion of said hydraulic motor being connected to the first jaw member whereby upon actuation of the first hydraulic motor the piston-rod portion moves outwardly of the cylinder portion to move the jaw members toward the closed position; plunger means movable with said first member and including a plunger head having a working face normally located adjacent and substantially in the same plane as the working face of said first jaw member, said plunger means being also movable from a first position wherein said plunger working face is in said normal position to a second position wherein said plunger working face extends outwardly from the plane of said first jaw member working face; second power means to move said plunger means from said first position toward said second position; said second power means including a second hydraulic motor of the type having a cyLinder portion and a piston-rod portion movable inwardly and outwardly of the cylinder portion; one portion of the second hydraulic motor being connected to the first jaw member; the other portion of the second hydraulic motor being connected to the plunger means whereby upon actuation of the second hydraulic motor the piston rod portion is moved outwardly of the cylinder portion and the plunger head is extended outward from said first position toward said second position; said first jaw member being of configuration to attain position between said tire wall and bead on the one hand and said radial flange on the other when said jaw member working face is positioned against said tire wall and said second jaw member is situated in contact with said ledge; said second jaw member being of configuration to attain a bearing relation to said ledge when said working face of said first jaw member is in contact with said tire wall; valve means operably connected to the first and second hydraulic motors for independent actuation thereof and adapted to receive hydraulic fluid under pressure from a remote hydraulic fluid source; and valve control means located on the valve means for controlling said valve means, sequentially movable between a first position actuating the first hydraulic motor and a second position actuating the second hydraulic motor, and a third position to release both hydraulic motors.

Claim 9

The tire bead demounting apparatus of claim 5 wherein: said jaw assembly has a pair of first jaw members and a pair of second jaw members; said plunger head being located between the first jaw members.

Claim 10

The tire bead demounting apparatus of claim 5 including: bias means associated with the first hydraulic motor biasing the piston-rod portion inwardly of the cylinder portion.

Claim 11

The tire bead demounting apparatus of claim 5 including: bias means normally biasing the piston-rod portion of the second hydraulic motor inwardly of the cylinder portion.