US4203575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic elevating ramp
Assignee: Loffland Brothers Co
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Filing: 1979-03-15
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Granted: 1980-05-20
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Expires: 1999-03-15
Abstract
Abstract An elevating ramp for vehicles comprising a first ramp section disposed at a preselected angle with respect to the horizontal whereby the vehicle may ascend the said ramp section until the entire vehicle is disposed thereon, and a second ramp section connected with the first ramp section for receiving the vehicle thereon, said second ramp section being disposed at a greater angle with respect to the horizontal than the first ramp section whereby the vehicle may be moved through a total angular dimension with respect to the horizontal which is greater than the physical characteristics of the vehicle normally permit. When the vehicle has been positioned on the apparatus, the position of the ramp may be hydraulic adjusted for supporting the entire vehicle in a substantially horizontal position elevated above the surface of the ground.
Inventors
- 👤 Earl R. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:12
CPC Classifications
B; B66; B66F; B66F7/00; B66F7/24; B66F7/243
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
194 words
An elevating ramp for wheeled vehicles and comprising a support base structure having an elevated support element, a ramp assembly extending outwardly from said support base structure and pivotally connected therewith for alternate lowered and raised positions with respect to the surface of the ground, said ramp assembly comprising at least two successive end to end separate sections disposed at planar angles with respect to each other, the angular difference between the two sections being approximately 7° , a first of said sections being of a length at least as great as the wheel base of the vehicle and being disposed adjacent the surface of the ground in the lowered position of the ramp assembly for initially receiving the vehicle thereon and extending at an upward angle of approximately 7° between the surface of the ground and the beginning of the succeeding section, said succeeding section extending upwardly from the first section whereby the vehicle may be driven along the entire length of the ramp apparatus through a total angular elevation of 14° with respect to the surface of the ground while maintaining no driving angle for the vehicle in excess of approximately 7°.
Claim 2
Dependent Claim
194 words
An elevating ramp for wheeled vehicles and comprising a support base structure having an elevated support element, a ramp assembly extending outwardly from said support base structure and pivotally connected therewith for alternate lowered and raised positions with respect to the surface of the ground, said ramp assembly comprising at least two successive end to end separate sections disposed at planar angles with respect to each other, the angular difference between the two sections being approximately 7° , a first of said sections being of a length at least as great as the wheel base of the vehicle and being disposed adjacent the surface of the ground in the lowered position of the ramp assembly for initially receiving the vehicle thereon and extending at an upward angle of approximately 7° between the surface of the ground and the beginning of the succeeding section, said succeeding section extending upwardly from the first section whereby the vehicle may be driven along the entire length of the ramp apparatus through a total angular elevation of 14° with respect to the surface of the ground while maintaining no driving angle for the vehicle in excess of approximately 7°.
Claim 3
Dependent Claim
58 words
An elevating ramp for vehicles as set forth in claim 1 and including contractable and expandable cylinder means operably connected with the ramp assembly for selective raising and lowering thereof with respect to the support base structure for altering the angular position therebetween for supporting of the vehicle on the ramp assembly in a substantially horizontally disposed position.
Claim 4
Dependent Claim
38 words
An elevating ramp for vehicles as set forth in claim 2 wherein the cylinder means comprises a pair of hydraulically actuated cylinders operably connected with the ramp assembly for pivoting thereof with respect to the support base structure.
Claim 5
Dependent Claim
39 words
An elevating ramp for vehicles as set forth in claim 2 and including pivotal support frame means operably connected with the ramp assembly and movable upon raising thereof for facilitating supporting of the ramp assembly in the raised position.
Claim 6
Dependent Claim
70 words
An elevating ramp for vehicles as set forth in claim 1 wherein the vehicle is a portable drilling rig having a portable derrick carried thereon, and said support base structure includes box-like framework means having said elevated support element substantially horizontally disposed whereby the derrick is supported by the elevated support element and the vehicle is supported by the ramp assembly in the elevated operation position of said ramp assembly.
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) | 1983-05-20 | 1983-11-19 | 1984-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-20 | 1987-11-19 | 1988-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-20 | 1991-11-19 | 1992-05-20 | $7700.00 | Window Closed / Lapsed |