Multiple pallet rack

Claim 2

In a pallet rack which comprises at least one pair of spaced, parallel rails having rolling rail surfaces and first and second wheeled carts mounted in rolling relation with said pair of rails, said second cart being capable of rolling over said first cart to overlie said first cart, the improvement comprising, in combination, the wheels of said first and second carts respectively rolling on the same rail surfaces, the front wheels of said second cart being positioned between the front and rear wheels of the first cart, whereby said second cart can roll between a first vertically overlying position relative to said first cart and a second position where most of said second cart is spaced along said rails from said first cart.

Claim 3

The pallet rack of claim 1 in which each of said pair of rails comprises a vertical web and a pair of generally horizontal flange portions having upper surfaces extending outwardly in opposed directions from said web, the wheels of said first and second carts riding on the same one of said flange portions.

Claim 4

The pallet rack of claim 2 in which at least one added wheeled cart is provided to roll on the other of said flange portions, said added wheeled cart being proportioned to permit rolling into vertically overlying relation with the first and second wheeled carts.

Claim 5

The pallet rack of claim 2 in which a second pair of said first and second wheeled carts is mounted in said rolling relation on the other of said flange portions, all of said carts in said pairs being proportioned to permit rolling into vertically overlying relation with the other carts of said parts.

Claim 6

The pallet rack of claim 2 in which each of said rails is of I-shaped cross-section.

Claim 7

The pallet rack of claim 1 in which said pair of rails are respectively defined by angled bars.

Claim 8

In a pallet rack which comprises at least one pair of spaced, parallel rails, having rolling rail surfaces, and first and second wheeled carts mounted in rolling relation with said pair of rails and defining a load-carrying area and front and rear wheels, said second cart being capable of rolling over said first cart to overlie said first cart, the improvement comprising, in combination: said rails being each of I-shaped cross section, the wheels of said first and second carts respectively rolling on the same rail surfaces, the front wheels of said second cart being positioned between the front and rear wheels of the first cart, whereby said second cart can roll between a first vertically overlying position relative to said first cart and a second position where most of said second cart is spaced along said rails from said first cart; said same rail surfaces comprising one of the inner and outer lower horizontal flange portions of said I-beam rail, and at least one added wheeled cart is provided to roll on the other of said inner or outer lower flange portions of said I-beam rail, said added wheeled cart being proportioned to permit rolling into vertically overlying relation with the first and second wheeled carts.

Claim 9

In a pallet rack which comprises at least one pair of spaced, parallel rails, having rolling rail surfaces, and first and second wheeled carts mounted in rolling relation with said pair of rails and defining a load-carrying area and front and rear wheels, said second cart being capable of rolling over said first cart to overlie said first cart, the improvement comprising, in combination: said rails being each of I-shaped cross section, the wheels of said first and second carts respectively rolling on the same rail surfaces, the front wheels of said second cart being positioned between the front and rear wheels of the first cart, whereby said second cart can roll between a first vertically overlying position relative to said first cart and a second position where most of said second cart is spaced along said rails from said first cart; said same rail surfaces comprising one of the inner and outer lower horizontal flange portions of said I-beam rail, and at least one added wheeled cart is provided to roll on the other of said inner or outer lower flange portions of said I-beam rail, said added wheeled cart being proportioned to permit rolling into vertically overlying relation with the first and second wheeled carts.

Claim 10

The pallet rack of claim 7 in which an added pair of said first and second wheeled carts is mounted in said rolling relation on the other of said inner and outer lower flange portions of the I-beam rails.

Claim 11

The pallet rack of claim 8 in which all of said carts in said pairs are proportioned to permit rolling into vertically overlying relation with the other carts of said pairs.