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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9045152 B1

PDFFull Text
Date of Patent:
Jun. 02, 2015

Filed:

Oct. 03, 2012

Electric assist cart

Applicant:

Kayaba Industry Co., Ltd., Minato-ku, Tokyo, JP;

Inventors:

Shinichi Sekine, Fukaya, JP;

Osamu Miyatani, Kani, JP;

Assignee:

KAYABA INDUSTRY CO., LTD., Tokyo, JP;

Attorney:

Lowe Hauptman & Ham, LLP

Primary Examiner:

Michael J Zanelli

Int. Cl.
CPC ...
B60L 15/20 (2006.01); B62B 5/00 (2006.01); B60L 1/00 (2006.01); B60L 3/00 (2006.01); B60L 3/04 (2006.01); B60L 7/12 (2006.01); B60L 11/18 (2006.01); B62B 3/00 (2006.01);
U.S. Cl.
CPC ...
B62B 5/0033 (2013.01); B60L 1/003 (2013.01); B60L 3/0061 (2013.01); B60L 3/0084 (2013.01); B60L 3/04 (2013.01); B60L 7/12 (2013.01); B60L 11/1805 (2013.01); B60L 15/2009 (2013.01); B60L 15/2036 (2013.01); B60L 2200/30 (2013.01); B60L 2220/46 (2013.01); B60L 2240/36 (2013.01); B60L 2240/423 (2013.01); B60L 2250/16 (2013.01); B60L 2270/145 (2013.01); Y02T 10/7005 (2013.01); Y02T 10/642 (2013.01); B62B 5/0073 (2013.01); B62B 3/001 (2013.01); B62B 2203/10 (2013.01); B62B 2301/20 (2013.01); B60L 3/0076 (2013.01); B60L 11/1877 (2013.01); Y02T 10/705 (2013.01); Y02T 10/7275 (2013.01);
Abstract

An electric assist cart includes: a body frame; a drive wheel; a control handle by which a user can input a driving force to the body frame; a torque sensor that detects a driving torque input to the body frame from the control handle; a controller that computes an assisting force based on the driving torque; and an electric motor that applies the assisting force to the drive wheel. The controller includes an electric current determination part that determines whether or not an electric current having a magnitude equal to or larger than a first setting value continuously flows for a first setting time, and an electric current control part that reduces a maximum value of the electric current that can be supplied to the electric motor to be smaller than the first setting value based on the determination of the electric current determination part.

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