# US 10,118,810 B2 · Method and system for a low height lift device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,118,810 B2 - Document ID: US10118810B2 - Status: Granted - Kind: B2 - Application number: 14/164,570 - Filed: 2014-01-27 - Published: 2015-07-30 - Granted: 2018-11-06 - Earliest claimed: 2014-01-27 - Assignees: Xtreme Manufacturing, LLC - Applicants: Xtreme Manufacturing, LLC - Inventors: Don Francis Ahern; Ronald Lee Fifield - Web page: https://patentgrep.com/patent/US10118810B2 ## CPC - B66F 11/042: {actuated by lazy-tongs mechanisms or articulated levers} - Y10T 29/49826: Assembling or joining - B66F: HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD ({invalid lifting devices A61G7/10; } mounting artificial islands on piles or like supports E02B17/00; scaffolding combined with lifting devices E04G1/22; lifting devices for sliding forms E04G11/24; lifting of buildings E04G23/06; shores or struts E04G25/00; lifts or other hoisting devices on ladders E06C7/12; props for mining E21D15/00) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A method and system for a scissors lift vehicle are provided. The scissors lift vehicle includes a carriage including a plurality of independently steerable wheels configured to engage a travel surface, the wheels including an axis of rotation and a circular profile having a radius R, the wheels spaced apart in a fore/aft direction and in a right/left direction. The scissors lift vehicle also includes a base coupled to the carriage between the wheels spaced apart in the right/left direction within a profile of the wheels and a scissors stack assembly including a plurality of scissors linkages extendable from a retracted position, where the scissors linkages are approximately horizontally configured to an extended position, where the scissors linkages are approximately orthogonally configured with respect to each other, the scissors stack assembly pivotally coupled to the base through a first pair of scissors linkages, the scissors stack assembly slidably coupled to the base through a second pair of scissors linkages. ## Claims ### Claim 1 A scissors lift vehicle comprising: a plurality of wheels configured to engage a travel surface and comprising a circular profile having a radius R, each wheel of the plurality of wheels powered by a respective drive unit, each wheel of the plurality of wheels steerable independently of each of the other of the plurality of wheels; and a scissors stack assembly comprising a plurality of scissors linkages oriented in a crisscross pattern wherein a bottom pair of scissors linkages of the plurality of scissors linkages is slidably coupled to a base of the scissors lift vehicle through a slot and a pin arrangement, said scissors stack assembly positioned with a portion of the plurality of scissors linkages positioned less than R above a surface of the plurality of wheels at a point along the surface where the surface contacts the travel surface during operation of the scissors lift vehicle. ### Claim 2 (depends on 1) The scissors lift vehicle of claim 1, further comprising a battery compartment formed in a carriage of the scissor lift vehicle and extending between the wheels and outboard of the scissors stack assembly. ### Claim 3 (depends on 2) The scissors lift vehicle of claim 2, wherein the battery compartment includes a power source configured to supply a total electrical requirement of the vehicle. ### Claim 4 (depends on 2) The scissors lift vehicle of claim 2, further comprising a first battery compartment formed in the carriage and extending between the wheels on a first side of the carriage and outboard of the scissors stack assembly, and further comprising a second battery compartment formed in the carriage and extending between the wheels on a second side of the carriage and outboard of the scissors stack assembly. ### Claim 5 (depends on 1) The scissors lift vehicle of claim 1, wherein a width of the scissors lift vehicle is less than about 78 centimeters. ### Claim 6 (depends on 1) The scissors lift vehicle of claim 1, wherein a width of the scissors lift vehicle is less than about 69 centimeters. ### Claim 7 (depends on 1) A method of assembling the scissors lift vehicle of claim 1, the method comprising: providing a substantially rectangular carriage, the substantially rectangular carriage including the base having a receptacle for a pivot joint and the slot for a slidable joint; coupling the plurality of independently steerable wheels to the carriage, the wheels each comprising an axis of rotation and the radius R, at least one wheel positioned proximate each corner of the rectangular carriage; and coupling the scissors stack assembly to the base, the scissors stack assembly pivotally coupled to the base through a first pair of scissors linkages of the plurality of scissors linkages, the scissors stack assembly slidably coupled to the base through said bottom pair of scissors linkages of the plurality of scissors linkages, where the base is positioned in a base plane vertically displaced from an axes plane including the axes of rotation a distance less than or equal to R. ### Claim 8 (depends on 7) The method of claim 7, wherein coupling the scissors stack assembly to the base comprises coupling the scissors stack assembly that includes the plurality of scissors linkages to the base, the plurality of scissors linkages extendable from a retracted position, where the scissors linkages are approximately horizontally configured to an extended position, where the scissors linkages are approximately orthogonally configured with respect to each other. ### Claim 9 (depends on 7) The method of claim 7, wherein coupling a plurality of independently steerable wheels to the carriage comprises coupling a plurality of independently steerable wheels to the carriage such that the axes plane is parallel to the travel surface on which the scissors lift vehicle is configured to operate. ### Claim 10 (depends on 7) The method of claim 7, further comprising coupling a deck to the scissors stack assembly at an end opposite the base, the deck being less than 3R above the travel surface when the plurality of scissors linkages are in the retracted position. ### Claim 11 (depends on 7) The method of claim 7, further comprising coupling a deck to the scissors stack assembly at an end opposite the base, the deck being less than 4R above the travel surface when the plurality of scissors linkages are in the retracted position. ### Claim 12 (depends on 7) The method of claim 7, wherein providing a rectangular carriage comprises providing a rectangular carriage having an overall length and an overall width, the overall length being greater than the overall width, the overall width being less than approximately 91 centimeters. ### Claim 13 (depends on 7) The method of claim 7, wherein providing a rectangular carriage comprises providing a rectangular carriage having an overall length and an overall width, the overall length being greater than the overall width, the overall width being less than approximately 83 centimeters. ### Claim 14 A scissors lift vehicle comprising: a plurality of wheels, each wheel comprising an axis of rotation independent of an axis of rotation of others of the plurality of wheels and a circular profile having a respective radius R, each wheel of the plurality of wheels powered by a respective drive unit; and a scissors stack assembly comprising a plurality of scissors linkages oriented in a crisscross pattern wherein a bottom pair of scissors linkages of the plurality of scissors linkages is slidably coupled to a base of the scissors lift vehicle through a slot and a pin arrangement, the scissors stack assembly is extendable from a retracted position, a portion of the plurality of scissors linkages positioned less than R above the lowest extent of the wheels during operation of the scissors lift vehicle. ### Claim 15 (depends on 14) The scissors lift vehicle of claim 14, wherein a width of the scissors lift vehicle is less than about 91 centimeters.