US 6,499,258 B1
Stabilizing jack system for portable bleacher
Keith Borglum,
218 Loma St.,
Waterloo, Iowa 50701 (US)
Assigned to Cimcool Industrial Products, Inc.,
Cincinnati, Ohio (US)
Filed on 28-Dec-2000, as Appl. No. Cimcool Industrial Products, Inc.,
Cincinnati, Ohio (US)
Int. Cl.7E04H 3/12
US 6,499,258 B1
Stabilizing jack system for portable bleacher
Keith Borglum,
218 Loma St.,
Waterloo, Iowa 50701 (US)
Filed on Dec. 28, 2000, as Appl. No. 9/750,728.
Int. Cl.7E04H 3/12
U.S. Cl. 528212;9
8 Claims
1. A portable bleacher construction comprising:
a wheeled framework for supporting a plurality of bleacher seats thereon in a mobile travel condition and a stationary seating
condition;
at least one pair of leveling jacks located on opposite sides of the framework for stabilizing the framework in the seating
condition upon a ground surface, wherein each of the jacks has an upper tubular member fixed to the framework, and a lower
tubular member with a ground-engaging foot telescopically received and slidably mounted in the upper tubular member for upward
and downward movement relative thereto; and
a control arrangement associated with one of the jacks for separately controlling the leveling of both of the jacks, wherein
the control arrangement includes a first rotatable crank assembly and a second rotatable crank assembly, wherein the first
and second crank assemblies are movably mounted on an upper end of the upper tubular member of one of the jacks for moving
the lower tubular members of both of the jacks on opposite sides of the framework upwardly and downwardly independent of each
other.
