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.:
Date of Patent:
Nov. 10, 1998
Filed:
May. 09, 1997
Yasuhiko Eguchi, Neyagawa, JP;
EXEDY Corporation, Neyagawa, JP;
Abstract
A stairway ascending/descending vehicle which may ascend/descend the steps of the stairs having a height greater than a diameter of wheels and in which vertical vibration is suppressed. The stairway ascending/descending vehicle has main shafts rotatably supported on a front portion and a rear portion of a vehicle body, respectively. Front arm members 4L and 4R are mounted to the front main shafts, and rear arm members 5L and 5R are mounted to the rear main shaft, the front and rear arm members are configured to rotate with respect to the main shafts. Front wheels 6a and 6b are mounted on the front arm members and rear wheels 7a and 7b are to the rear arm members. Torque transmitted from each of the main shafts is transmitted through a first gear 12 connected to the main shafts to second gears 13a and 13b and third gears 14a and 14b to the wheels, the gears 12, 13a, 13b, 14a and 14b all being supported within the arm members, the gears 14a and 14b being connected to the wheels. The gear ratio defined by the gears 12, 13a, 13b, 14a and 14b determine whether the vehicle body 1 climbs a stairway in either a crawling mode or a rotational mode.