Automated guided vehicle top disposed towing apparatus

• US 5,154,249 A
• Filed: 01/17/1992
• Issued: 10/13/1992
• Est. Priority Date: 03/05/1991
• Status: Expired due to Fees

• Current Assignee: HK Systems Incorporated (KION GROUP AG)
• Original Assignee: Eaton-Kenway Incorporated
• Inventors: Yardley, James V.
• Primary Examiner(s): Marmor, Charles A.
• Assistant Examiner(s): MAR, MICHAEL Y
• Application Number:
  US07/822,381
• Time in Patent Office: 270 Days
• Field of Search: 180/168, 180/167, 180/235, 180/6.5, 318/587, 280/433, 280/492, 280/511, 280/496, 280/901
• US Class Current: 180/168
• CPC Class Codes: B60D 1/06 Ball-and-socket hitches , e.g. constructional details, auxiliary devices, their arrangement on the vehicle
• CPC Class Codes: B62D 49/007 Tractors for handling trailers, e.g. roll-trailers in terminals

Abstract

A novel trailer towing apparatus for an AGV whereby downwardly applied, vertically oriented towing loads are substantially, directly imposed upon the drive wheels of the AGV, thereby increasing wheel to ground frictional forces and resulting towed load capacity. The towing apparatus is attached to the top of the AGV thereby allowing the AGV to turn through a 360° radius without moving the trailer.

Claims

1. A method of towing a trailer by an unmanned automated guided vehicle, the vehicle having a main body with a front portion, a rear portion, opposed side portions, and a top surface, remote controlled steering means, at least one front floor engaging wheel disposed along the front portion of the vehicle, at least one rear floor engaging wheel disposed along the rear portion of the vehicle, at least two floor engaging wheels disposed along respective opposed side portions of the vehicle, individual means for bidirectionally driving the at least two of said floor engaging wheels disposed along respective opposed side portions of said vehicle, a mounting plate attached to said top surface, and hitch means attached to said plate in a centrally disposed location between said side portions and said front and rear pair of wheels, the trailer having a tow bar with one end secured to a trailer body and an opposite end with releasable coupling means adapted to be releasably coupled with said centrally disposed hitch means for rotational movement about a vertical axis extending through said hitch means, wherein the method comprises the steps of:

positioning the centrally disposed hitch means of the vehicle directly below the releasable coupling means of the tow bar;

elevating the hitch means into coupling engagement with the releasable coupling means; and

,

steering the vehicle in response to remotely transmitted signals to said steering means by driving selected ones of said wheels driven by said driving means in selected directions so as to produce rotational movement of said vehicle about said vertical axis either with or without displacement of either said tow bar or said trailer body.

2. The method according to claim 1 wherein the steering step comprises causing the unmanned automated guided vehicle and the towed trailer to be jointly displaced from a first to a second location along a predetermined path.

3. The method according to claim 1 comprising an additional step of disengaging the trailer from towed relation with the unmanned automated guided vehicle into non-contiguous relation with the unmanned automated guided vehicle by lowering the hitch means from coupling engagement with the releasable coupling means.

4. The method according to claim 3 wherein the disengaging step comprises receiving remotely transmitted signals at the unmanned automated guided vehicle and thereby causing the unmanned automated guided vehicle to lower the hitch means.

5. The method according to claim 1 wherein the steering step comprises steering the vehicle through a 360°

turn without displacement of either said tow bar or said trailer body.