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:
Sep. 17, 2002
Filed:
Jun. 30, 2000
Donald J. Legatt, St. Michael, MN (US);
Nilfisk-Advance, Inc., Plymouth, MN (US);
Abstract
A riding machine ( ) includes a battery pack positioned as low as possible in the chassis ( ) between the front and rear wheels ( ) and removable in a horizontal movement direction while supported by the bottom by a pallet jack. A steering system includes steering shafts ( ) which are rotatable together while allowing relative pivotable movement therebetween and which are rotatably connected to the spindle ( ) of the steerable rear wheels ( ) through a jack shaft ( ). In one preferred form, the burnishing head of the machine ( ) is raised and lowered relative to the floor surface by an electric actuator ( ) which pivots a linkage ( ) through a connection allowing floating travel. The pressure which the treating member ( ) engages the floor surface is controlled in response to the current level of the electric motor ( ) which rotates the treating member ( ). The current level of the electric motor ( ) is measured by monitoring the voltage at the ends of a negative supply lead cable ( ) and the temperature of the cable ( ). In an alternate form, the floor scrubbing member ( ) of the machine ( ) is raised and lowered relative to the floor surface and applied by a down pressure which can be added or removed by the electric actuator ( ) through the same type of connection allowing floating travel.