# US 8,739,985 B2 · Push-back cart storage system with a top cart rolling on top of push-back rails

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,739,985 B2
- Document ID: US8739985B2
- Status: Granted
- Kind: B2
- Application number: 12/969,439
- Filed: 2010-12-15
- Published: 2012-06-21
- Granted: 2014-06-03
- Earliest claimed: 2010-12-15
- Assignees: J. C. M. Industries, Inc.
- Applicants: John Krummell; Kenneth Davison
- Inventors: John Krummell; Kenneth Davison
- Web page: https://patentgrep.com/patent/US8739985B2

## CPC

- B65G 1/026: {Racks equipped with a displaceable load carrying surface to facilitate loading or unloading}
- B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D)

## Abstract

In a push back cart rack storage system, the top or first cart, as well as the second cart, may be made with less material, and may be significantly simpler and lighter in comparison to existing designs. A push-back cart storage system has a single pair of push-back rails in each lane. A third cart has front and back wheels rolling on a lower inside flange of the push-back rails. A second cart has front wheels rolling on a lower inside cart flange of side rails of the third cart, and has rear wheels rolling on the lower inside flange of the push-back rails. A first or top cart has front and rear wheels rolling on a top surface of the push-back rails. The wheels on the first cart may be inner facing wheels while the wheels on the other carts may be outer facing wheels. The push-back rails and the side rails of the carts may be generally C-shaped channel sections. The top cart and the second cart may be made of angle sections to reduce the weight of the cart and the amount of material needed to manufacture the cart.

## Claims

### Claim 1

A push-back storage system, comprising:
a rack structure forming vertically stacked lanes;
a single pair of push-back rails in each of the lanes, with the pair including a left side push-back rail and right side push-back rail, and with the left and right side push-back rails each having upper and lower inner flanges joined to a web section, and with the inner flanges of the left and right side push-back rails extending towards each other;
a respective fourth cart having outer left and right front wheels and left and right back wheels rolling on the lower inner flanges of the left and right side push-back rails, and with the fourth cart having left and right side rails;
a respective third cart having outer left and right front wheels rolling on lower inside left and right flanges of said left and right side rails of the fourth cart, and having outer left and right back wheels rolling on the lower inner flanges of the left and right push-back rails, respectively;
a respective second cart having outer left and right front wheels rolling on lower inside left and right flanges of left and right side rails of the third cart, and having outer left and right back wheels rolling on the lower inner left and right flanges of the left and right push-back rails, respectively, with the second cart having left and right side top flanges each extending laterally outwardly over the left and right side rails of the fourth cart;
a respective first cart having left and right front and left and right back inner facing wheels rolling on a top surface of the left and right push-back rails, respectively, with the first cart having front, back, left and right side members joined to each other, and with vertical sections joined to the first cart to provide wheel supports; and
left and right anti-liftoff channel sections attached to a bottom surface of the first cart and extending under said left and right side top flanges on the second cart to prevent the first cart from lifting off of the second cart, and with the left and right anti-liftoff channel sections vertically above the left and right side rails of the fourth cart.

### Claim 2 (depends on 1)

The push-back storage system of claim 1 wherein the push-back rails are substantially C-shaped channel sections.

### Claim 3 (depends on 1)

The push-back storage system of claim 1 wherein the first cart is shorter than the second cart.

### Claim 4 (depends on 1)

The push-back storage system of claim 1 wherein the first cart is wider than each of the second, third and fourth carts.

### Claim 5 (depends on 1)

The push-back storage system of claim 1 wherein the first cart has a width greater than the dimension between the web section of the left and right side push-back rails.

### Claim 6 (depends on 1)

The push-back storage system of claim 1 with the first cart including left and right inwardly projecting lips extending under left and right retaining blocks on the left and right push-back rails, respectively.

### Claim 7 (depends on 1)

The push-back storage system of claim 1 with all of the wheels on the first cart comprising flanged wheels, and with all of the wheels on the second and third carts comprising un-flanged wheels.

### Claim 8 (depends on 1)

The push-back storage system of claim 1 with each wheel on the first cart rotatably attached to a substantially horizontal axle, and with each wheel on the second cart and on the third cart attached to an axle extending upwardly at an acute angle.

### Claim 9 (depends on 1)

The push-back storage system of claim 1 with each push-back rail comprising a C-channel section, and with only the front left and right and the back left and right inner facing wheels of the first cart rolling on the top surface of the push-back rails.

### Claim 10

A push-back storage system, comprising:
a rack structure forming vertically stacked lanes;
a single pair of C-shaped channel section push-back rails in each of the lanes, with the pair including a left side push-back rail and right side push-back rail, and with the left and right side push-back rails each having upper and lower inner flanges joined to a web section, and with the inner flanges of the left and right side push-back rails extending towards each other;
a respective fourth cart having outer left and right front wheels and left and right back wheels rolling on the lower inner flanges of the left and right side push-back rails, and with the fourth cart having left and right side rails;
a respective third cart having outer left and right front wheels rolling on lower inside left and right flanges of said left and right side rails of the fourth cart, and having outer left and right back wheels rolling on the lower inner flanges of the left and right push-back rails, respectively;
a respective second cart having outer left and right front wheels rolling on lower inside left and right flanges of left and right side rails of the third cart, and having outer left and right back wheels rolling on the lower inner left and right flanges of the left and right push-back rails, respectively, with the second cart having left and right side top flanges each extending laterally outwardly over the left and right side rails of the fourth cart; and
a respective first cart having left and right front and left and right back inner facing wheels rolling on a top surface of the left and right push-back rails, respectively, with the first cart having front, back, left and right side members joined to each other, and with vertical sections joined to the first cart to provide wheel supports;
with only the front left and right and the back left and right inner facing wheels of the first cart rolling on the top surface of the push-back rails, and with all of the wheels on the first cart comprising flanged wheels, and with all of the wheels on the second and third carts comprising un-flanged wheels;
with each wheel on the first cart rotatably attached to a substantially horizontal axle, and with each wheel on the second cart and on the third cart attached to an axle extending upwardly at an acute angle; and
left and right anti-liftoff channel sections attached to a bottom surface of the first cart and with the left and right side top flanges of the second cart extending into the left and right anti-liftoff channel sections, respectively, to prevent the first cart from lifting away from the second cart.