Two-piece mount/demount head for a wheel servicing machine
A tire changing tool head, or a mount/demount head for a tire changing machine, includes a head body and a tongue member. The tongue member is pivotally attached to the head body at a pivoting joint. The tongue member includes a tongue shoulder and a tongue blade for engaging a tire bead during tire installation. The tongue member includes a non-metal material, such as a polymer, for preventing wheel rim damage in some embodiments. The head body includes a bead lifter tool protruding therefrom. In some embodiments, the head body and bead lifter tool include a metal material.
1. A mount/demount head apparatus usable on a tool holder shaft extending from a swing arm on a tire changing machine for performing tire changing operations on a wheel rotatably mounted on the machine, the apparatus comprising:
a head body;
a bead lifter tool projecting from the head body in a first direction;
a tongue member extending from the head body in a second direction generally opposite the first direction, wherein the tongue member is freely pivotable relative to the head body at a pivotable tongue joint during the tire changing operations about a tongue pivot axis offset from the tool holder shaft, the tongue member including:
a tongue shoulder disposed on the tongue member facing away from the head body, a face of the tongue shoulder having an orientation that is substantially parallel with the tongue pivot axis;
a tongue blade extending from the tongue shoulder, the tongue blade including an upper tongue blade surface having a first blade surface region oriented approximately perpendicular to the tongue pivot axis and a second blade surface region sloping downwardly and radially outwardly away from the first blade surface region;
a tongue flange extending from the tongue shoulder above the tongue blade; and
a tongue guide recess defined in the tongue shoulder between the tongue flange and the tongue blade;
a coupling disposed on the head body;
a socket defined in one of either the coupling or the tool holder shaft; and
wherein:
the coupling is configured to secure the head body to the tool holder shaft at the socket; and
the head body is angularly adjustable relative to the tool holder shaft when secured to the tool holder shaft.
2. The apparatus of claim 1 , wherein:
the tongue joint defines the tongue pivot axis about which the tongue member is pivotable, and
the tongue pivot axis is oriented substantially parallel to the tool holder shaft.
3. The apparatus of claim 1 , wherein:
the head body comprises a metal material; and
the tongue member comprises a non-metal material.
4. The apparatus of claim 1 , wherein:
the tongue member comprises a polymer material.
5. The apparatus of claim 1 , wherein:
the tongue member comprises nylon.
6. The apparatus of claim 1 , wherein:
the tongue member consists entirely of nylon.
7. The apparatus of claim 1 , the pivotable tongue joint further comprising:
a head boss extending from the head body toward the tongue member;
a tongue boss extending from the tongue member toward the head body;
a pivot pin disposed between the head boss and the tongue boss; and
wherein the pivot pin pivotally attaches the tongue member to the head body.
8. The apparatus of claim 1 , wherein:
the bead lifter tool is integrally formed on the head body.
9. The apparatus of claim 1 , further comprising:
a mounting member disposed on the head body on the side opposite the tongue member.
10. The apparatus of claim 9 , wherein:
the bead lifter tool comprises a separate component attached to the mounting member.