Patent US4834409A successfully refreshed from Google Patents.
US4834409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Personal mobility vehicle with expansible wheel base and wheel track
Assignee: BURKE Inc A CORP OF KS
•
Filing: 1987-10-13
•
Granted: 1989-05-30
•
Expires: 2007-10-13
Abstract
Abstract A personal mobility vehicle includes a main frame unit with front and back ends, both with wheels thereon, a steerable front wheel, an operator's seat and vehicle controls. A pair of spaced rear wheels are mounted at the back end of the vehicle and include moveably mounted axles supporting the rear wheels and connected to arms with mechanisms for selectively angularly moving the axles outwardly and inwardly of the main frame unit to vary wheel base and wheel track. A motor is connected to the wheel support structure for remotely varying the wheel base and wheel track. A separate drive motor is operatively connected to the wheels for movement of the vehicle.
Inventors
- 👤 DuWayne E. Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:43
CPC Classifications
B; B62; B62D; B62D49/00; B62D49/06; B62D49/0678; B60; B60B; B60B35/00; B60B35/02; B60B35/10; B60B35/1036; B60B35/1045; B60B35/1072; B60B35/12; B60B35/14; B62K; B62K5/00; B62K5/02; B62K5/023; B62K5/025; A; A61; A61G; A61G5/00; A61G5/10; A61G5/1056; A61G5/1072; B60Y; B60Y2200/00; B60Y2200/80; B60Y2200/84; Y; Y10; Y10S; Y10S180/00; Y10S180/906; Y10S180/907
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
125 words
A personal mobility vehicle comprising: (a) a main frame unit including a front end and a back end, said front end including a steerable front wheel and means for steering, said main frame unit including an operator's seat, and vehicle control means associated therewith; (b) a pair of spaced rear wheels mounted at said back end and including moveably mounted axles supporting said rear wheels and further including means for selectively moving said axles outwardly and inwardly and forwardly and rearwardly with reference to said main frame unit; (c) motor means connected to said means for selectively moving said axles and including motor control means for operation thereof; and (d) drive means operably connected to at least a said wheel for movement of said vehicle.
Claim 2
Dependent Claim
125 words
A personal mobility vehicle comprising: (a) a main frame unit including a front end and a back end, said front end including a steerable front wheel and means for steering, said main frame unit including an operator's seat, and vehicle control means associated therewith; (b) a pair of spaced rear wheels mounted at said back end and including moveably mounted axles supporting said rear wheels and further including means for selectively moving said axles outwardly and inwardly and forwardly and rearwardly with reference to said main frame unit; (c) motor means connected to said means for selectively moving said axles and including motor control means for operation thereof; and (d) drive means operably connected to at least a said wheel for movement of said vehicle.
Claim 3
Dependent Claim
121 words
A personal mobility vehicle comprising: (a) a main frame unit including a front end and a back end, said front end including a steerable front wheel and means for steering, said main frame unit including an operator's seat, and vehicle control means associated therewith; (b) drive means connected to said front wheel for powered rotation thereof; (c) a pair of spaced rear wheels mounted at said back end and including moveably mounted axles supporting said rear wheels and further including means for selectively moving said axles outwardly and inwardly and forwardly and rearwardly with reference to said main frame unit; and (d) motor means connected to said means for selectively moving said axles and including motor control means for operation thereof.
Claim 4
Dependent Claim
121 words
A personal mobility vehicle comprising: (a) a main frame unit including a front end and a back end, said front end including a steerable front wheel and means for steering, said main frame unit including an operator's seat, and vehicle control means associated therewith; (b) drive means connected to said front wheel for powered rotation thereof; (c) a pair of spaced rear wheels mounted at said back end and including moveably mounted axles supporting said rear wheels and further including means for selectively moving said axles outwardly and inwardly and forwardly and rearwardly with reference to said main frame unit; and (d) motor means connected to said means for selectively moving said axles and including motor control means for operation thereof.
Claim 5
Dependent Claim
102 words
The personal mobility vehicle set forth in claim 2 wherein: (a) a support beam extends rearwardly at said main frame unit rear end and a traveling ball and screw assembly is mounted on said support beam; (b) a set of opposed telescoping arms have inner ends connected to the support beam and outer ends connected to said axles in fixed angular relationship thereto; (c) a set of opposed swingably mounted link rods have inner ends connected to said traveling ball and outer ends connected to said axles; and (d) said motor means is operably connected to said screw for rotation of same.
Claim 6
Dependent Claim
97 words
The personal mobility vehicle set forth in claim 2 wherein: (a) a support beam extends rearwardly at said main frame unit and an extensible assembly is mounted on said support beam; (b) a set of opposed telescoping arms have inner ends connected to said support beam and outer ends connected to said axles in fixed angular relationship thereto; (c) a set of opposed swingably mounted link rods have inner ends connected to said extensible assembly and outer ends connected to said axles; and (d) said motor means is operably connected to said extensible assembly for operation thereof.
Claim 7
Dependent Claim
126 words
A personal mobility vehicle comprising: (a) a main frame unit including a front end and a back end, said front end including a steerable front wheel and means for steering, said main frame unit including an operator's seat, and vehicle control means associated therewith; (b) a pair of spaced rear wheels mounted at said back end and including moveably mounted axles supporting said rear wheels and with means for selectively moving said axles outwardly and inwardly and forwardly and rearwardly with respect to said main frame unit; (c) motor means connected to said means for selectively moving said axles outwardly and inwardly and forwardly and rearwardly and including motor control means for operation thereof; and drive means connected to said rear wheels for powered rotation thereof.
Claim 8
Dependent Claim
126 words
A personal mobility vehicle comprising: (a) a main frame unit including a front end and a back end, said front end including a steerable front wheel and means for steering, said main frame unit including an operator's seat, and vehicle control means associated therewith; (b) a pair of spaced rear wheels mounted at said back end and including moveably mounted axles supporting said rear wheels and with means for selectively moving said axles outwardly and inwardly and forwardly and rearwardly with respect to said main frame unit; (c) motor means connected to said means for selectively moving said axles outwardly and inwardly and forwardly and rearwardly and including motor control means for operation thereof; and drive means connected to said rear wheels for powered rotation thereof.
Claim 9
Dependent Claim
108 words
The personal mobility vehicle set forth in claim 5 wherein: (a) a support beam extends rearwardly at said main frame unit and an extensible assembly is mounted on said support beam; (b) wheel support arms extend from said main frame unit and include a set of opposed telescoping arms having inner ends connected to said support beam and outer ends connected to said axles in fixed angular relationship thereto, and a set of opposed swingably mounted link rods having inner ends connected to said extensible assembly and outer rods connected to said axles; and (c) said motor means is operably connected to said extensible assembly for operation thereof.
Claim 10
Dependent Claim
109 words
A personal mobility vehicle comprising: (a) a main frame unit including a front end and a back end, the back end having a pair of spaced rear wheels coupled therewith and the front end having a steerable front wheel and means for steering, said main frame unit including an operator's seat and vehicle control means associated therewith; (b) drive means connected to at least one of said rear wheels for powered rotation thereof; (c) moveably mounted axles supporting said rear wheels; and (d) an adjustable mechanism coupled with said axles for selectively moving said axles outwardly and inwardly and forwardly and rearwardly with reference to said main frame unit.
Claim 11
Dependent Claim
109 words
A personal mobility vehicle comprising: (a) a main frame unit including a front end and a back end, the back end having a pair of spaced rear wheels coupled therewith and the front end having a steerable front wheel and means for steering, said main frame unit including an operator's seat and vehicle control means associated therewith; (b) drive means connected to at least one of said rear wheels for powered rotation thereof; (c) moveably mounted axles supporting said rear wheels; and (d) an adjustable mechanism coupled with said axles for selectively moving said axles outwardly and inwardly and forwardly and rearwardly with reference to said main frame unit.
Claim 12
Dependent Claim
67 words
The personal mobility vehicle set forth in claim 7 wherein: (a) said adjustable mechanism includes a set of opposed telescoping arms having inner ends coupled with said main frame unit and outer ends coupled with said axles in fixed angular relationship thereto, and a set of opposed swingably mounted link rods having inner ends coupled with said main frame unit and outer ends connected with said axles.
Claim 13
Dependent Claim
76 words
The personal mobility vehicle set forth in claim 8 wherein: (a) a support beam extends rearwardly at set main frame unit back end and said adjustable mechanism includes an extensible assembly mounted on said support beam; and (b) said inner ends of the link rods are coupled with said extensible assembly, whereby extension and retraction of said extensible assembly causes movement of said axles outwardly and inwardly and forwardly and rearwardly of said main frame unit.
Claim 14
Dependent Claim
34 words
The personal mobility vehicle set forth in claim 9 including motor means coupled with said extensible assembly for causing extension and retraction thereof and including motor control means for operation of the motor means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |