Wheel restraining means

Apparatus restraining movement of a tire wheel rim having a central rim opening surrounding a shaft having external thread-like lands thereon and extending upwardly from a tire changing machine, comprising

• a lower conical member surrounding the shaft and clearing the thread-like lands engageable with the edges of the rim opening and having an outer surface inclined at an angle to the vertical whose tangent is equal to or less than the coefficient of friction between the edges of the wheel rim defining the rim opening and said lower conical member, whereby said lower conical member is freely movable axially on the shaft,
• means for urging said lower conical member into engagement with said rim opening,
• a flexible member adapted to surround the upwardly extending shaft and to engage the upper surface of the tire wheel rim,
• a rigid member contacting the upper side of said flexible member and having a centrally located hole therethrough which receives the upwardly extending shaft,
• and an upper conical member disposed with the base thereof positioned downwardly in contact with said rigid member and having a hole therethrough with internal threads formed therein to fit the thread-like lands on the shaft, said internal threads being engageable with the upwardly extending shaft whereby said upper conical member may be turned on said threads to thereby urge said flexible member into pressure engagement with the upper surface of the tire wheel rim.