# US 4,398,737 A · Transport device for wheelless power driven equipment

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

- Number: US 4,398,737 A
- Document ID: US4398737A
- Status: Granted
- Kind: A
- Application number: 06/224,809
- Filed: 1981-01-13
- Granted: 1983-08-16
- Earliest claimed: 1981-01-13
- Assignees: Equipment Development Company, Inc.
- Inventors: Edward M. Harding
- Web page: https://patentgrep.com/patent/US4398737A

## CPC

- B60B 33/00: Castors in general {; Anti-clogging castors} (castors for large containers B65D90/18)
- B62B 5/0083: {Wheeled supports connected to the transported object}
- B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B62B: HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES (characterised by animal propulsion B62C; propulsion of sledges by driver or engine B62M)

## Abstract

A detachable wheeled dolly or hybrid roller skate device for separable connection to the base portion and the handle of relatively large and heavy wheelless power driven handle manipulated machines is disclosed whereby an upward push on lifting the handle tilts the machine from out of surface contact and allows the roller skate device to swing under the machine. A subsequent lowering of the machine allows the roller skate device to support the machine, whereby a downward push on the handle tilts the machine out of surface contact and facilitates transport of the machine from one location to another as required. The centroid or center of mass of the hybrid roller skate device is located so that the roller skate device will swing under the machine to be supported.

## Claims

### Claim 1

A portable hybrid roller skate device for use in transporting a relatively large and heavy surface treating machine having a base rim across a surface, said device comprising:
a body;
pivot hook means integral with said body for hooking over and pivoting about the base rim of said surface treating machine;
said roller skate device having a centroid located so that when the base rim of said surface treating machine nearest said pivot hook means is lifted from a resting position on said surface, said roller skate pivots about said base rim and swings under said surface treating machine to remain under said machine when said machine is returned to a resting position to support at least a portion of said machine; and
roller means mounted on said body for contacting said surface when said roller skate device supports said machine, said roller means allowing the device to be easily transported.

### Claim 2 (depends on 1)

The roller skate device of claim 1 wherein said base rim of said machine conforms to the shape of said hook means to operatively interact therewith.

### Claim 3 (depends on 2)

The roller skate device of claim 2 wherein said base rim of said machine is a guard ring;
said hook means comprising first and second spaced, downwardly opening hooks which are placed over said guard ring to operatively interact therewith.

### Claim 4 (depends on 2)

The roller skate device of claim 2 wherein said machine includes a handle;
said machine being transported on said roller means in a manner similar to a two wheeled dolly.