US3749201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ambulatory elevator with folding platform
Assignee: Autoquip Corp
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Filing: 1972-02-02
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Granted: 1973-07-31
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Expires: 1992-02-02
Abstract
Abstract A portable lift has a frame with a vertical mast. The mast defines two ways, one of which is closed on the front and back side while the other is closed only on the back side. A platform has upper wheels in the first ways and lower wheels in the second ways so that the platform is pivotal about the axis of the upper wheels, with the lower wheels moving away from the mast during pivoting. When horizontal the platform is too large to go through a doorway, but when pivoted, the frame and platform will go through a doorway. Within the mast is a hydrualic cylinder, the piston of which extends downwardly and is attached at its lower end to the frame. The cylinder is attached to the platform at a pivotal axis coincident with the axis of the upper wheels. Cables are provided to connect between the top of the mast and the middle of the platform when the platform is in the raised position so that when the hydraulic cylinder is lowered from the raised position, the cables will pull the platform into the hold position. The frame is mounted on wheels, one of which is dirigible. The dirigible wheel is attached to a vertical rod which has a cam eccentrically connected thereto. The cam bears against an abutment which is above it and forms a part of the frame. The steering handle is connected to the cam so that the handle may be used to rotate the cam and force the wheel downwardly, or it may be used to turn the rod about its vertical axis so as to steer the wheel.
Inventors
- 👤 J Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:28
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/02; B66F9/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
184 words
In an ambulatory lift apparatus comprising a frame having a vertical mast, wheel means for supporting said frame so that it can be moved about, a loading platform, means connecting the platform to the mast for vertical movement up and down the mast, power means operatively connecting the frame and platform for moving the platform vertically, the improvement comprising: said connecting means forming a hinge connection to said platform for movement of the platform about a horizontal axis with respect to said mast so that when folded for movement or storage the horizontal area occupied by the apparatus is reduced, said axis being located substantially above the platform; and said mast including two ways, one of said ways having a front and a back side, the second way having a back side only; said connecting means including a wheel rotatable about said axis and located in the first way whereby it is restrained against horizontal movement and a wheel in the second way whereby it may be moved away from said mast in a forward direction, said second wheel being below said first wheel.
Claim 2
Dependent Claim
184 words
In an ambulatory lift apparatus comprising a frame having a vertical mast, wheel means for supporting said frame so that it can be moved about, a loading platform, means connecting the platform to the mast for vertical movement up and down the mast, power means operatively connecting the frame and platform for moving the platform vertically, the improvement comprising: said connecting means forming a hinge connection to said platform for movement of the platform about a horizontal axis with respect to said mast so that when folded for movement or storage the horizontal area occupied by the apparatus is reduced, said axis being located substantially above the platform; and said mast including two ways, one of said ways having a front and a back side, the second way having a back side only; said connecting means including a wheel rotatable about said axis and located in the first way whereby it is restrained against horizontal movement and a wheel in the second way whereby it may be moved away from said mast in a forward direction, said second wheel being below said first wheel.
Claim 3
Dependent Claim
71 words
In an apparatus as set forth in claim 1, including releasably connectable means between the upper end of the mast and a portion of said platform spaced from said mast when said platform is adjacent the upper end of its movement, whereby when the power means is thereafter actuated in a direction to lower said platform, said platform will pivot about said axis from a horizontal position toward a vertical position.
Claim 4
Dependent Claim
55 words
In an apparatus as set forth in claim 2, wherein said power means includes a hydraulic linear motor comprising a cylinder member and piston member in said cylinder member, one of said members being attached at the bottom end to said frame, the other member being pivotally attached to said connecting means at said axis.
Claim 5
Dependent Claim
97 words
In an apparatus as set forth in claim 3, including a rod vertically movable in said frame, a curvilinear cam eccentrically attached to said rod for rotation about a horizontal axis, said frame including an abutment above said cam and in contact therewith, means attached to said cam to rotate said cam about said horizontal axis whereby rotation in one direction forces said rod downwardly and rotation in the other direction permits said rod to move upwardly with respect to the frame, and means connecting one of said wheel means to the lower end of said rod.
Claim 6
Dependent Claim
188 words
In an ambulatory lift apparatus comprising a frame having a vertical mast, wheel means for supporting said frame so that it can be moved about, a loading platform, means connecting the platform to the mast for vertical movement up and down the mast, power means operatively connecting the frame and platform for moving the platform vertically, the improvement comprising: said connecting means forming a hinge connection to said platform for movement of the platform about a horizontal axis with respect to said mast so that when folded for movement or storage the horizontal area occupied by the apparatus is reduced; and a rod vertically movable in said frame, a curvilinear cam eccentrically attached to said rod for rotation about a horizontal axis, said frame including an abutment above said cam and in contact therewith, means attached to said cam to rotate said cam about said horizontal axis whereby rotation in one direction forces said rod downwardly and rotation in the other direction permits said rod to move upwardly with respect to the frame, and means connecting one of said wheel means to the lower end of said rod.
Claim 7
Dependent Claim
188 words
In an ambulatory lift apparatus comprising a frame having a vertical mast, wheel means for supporting said frame so that it can be moved about, a loading platform, means connecting the platform to the mast for vertical movement up and down the mast, power means operatively connecting the frame and platform for moving the platform vertically, the improvement comprising: said connecting means forming a hinge connection to said platform for movement of the platform about a horizontal axis with respect to said mast so that when folded for movement or storage the horizontal area occupied by the apparatus is reduced; and a rod vertically movable in said frame, a curvilinear cam eccentrically attached to said rod for rotation about a horizontal axis, said frame including an abutment above said cam and in contact therewith, means attached to said cam to rotate said cam about said horizontal axis whereby rotation in one direction forces said rod downwardly and rotation in the other direction permits said rod to move upwardly with respect to the frame, and means connecting one of said wheel means to the lower end of said rod.
Claim 8
Dependent Claim
58 words
In an apparatus as set forth in claim 5, wherein said rod is cylindrical and is rotatable about a vertical axis with respect to said frame, said last mentioned means including a steering handle secured to said cam to permit a user to rotate said cam about said horizontal axis and rotate said rod about said vertical axis.
Claim 9
Dependent Claim
146 words
In an ambulatory lift apparatus comprising a frame having a vertical mast, wheel means for supporting said frame so that it can be moved about, a loading platform, means connecting the platform to the mast for vertical movement up and down the mast, power means operatively connecting the frame and platform for moving the platform vertically, the improvement comprising: said connecting means forming a hinge connection to said platform for movement of the platform about a horizontal axis with respect to said mast so that when folded for movement or storage the horizontal area occupied by the apparatus is reduced; and said power means including a hydraulic linear motor comprising a cylinder member and a piston member in said cylinder, one of said members being attached at the ottom end to said frame, the other member being pivotally attached to said connecting means at said axis.
Claim 10
Dependent Claim
146 words
In an ambulatory lift apparatus comprising a frame having a vertical mast, wheel means for supporting said frame so that it can be moved about, a loading platform, means connecting the platform to the mast for vertical movement up and down the mast, power means operatively connecting the frame and platform for moving the platform vertically, the improvement comprising: said connecting means forming a hinge connection to said platform for movement of the platform about a horizontal axis with respect to said mast so that when folded for movement or storage the horizontal area occupied by the apparatus is reduced; and said power means including a hydraulic linear motor comprising a cylinder member and a piston member in said cylinder, one of said members being attached at the ottom end to said frame, the other member being pivotally attached to said connecting means at said axis.
Claim 11
Dependent Claim
83 words
In an apparatus as set forth in claim 7, wherein said mast includes two ways, one of said ways having a front and a back side, the second way having a back side only, said connecting means including a wheel rotatable about said axis and located in the first way whereby it is restrained against horizontal movement and a wheel in the second way whereby it may be moved away from said mast, said second wheel being vertically spaced from said first wheel.
Claim 12
Dependent Claim
146 words
In a portable lift apparatus comprising a frame having a vertical mast, wheel means for supporting said frame so that it can be moved about, a loading platform, means connecting the platform to the mast for vertical movement up and down the mast, power means operatively connecting the frame and platform for moving the platform vertically. the improvement comprising: a rod vertically movable in said frame, a curvilinear cam eccentrically attached to said rod for rotation about a horizontal axis, said frame including an abutment above said cam and in contact therewith, means attached to said cam to rotate said cam about said horizontal axis whereby rotation in one direction forces said rod downwardly and rotAtion in the other direction permits said rod to move upwardly with respect to the frame, and means connecting one of said wheel means to the lower end of said rod.
Claim 13
Dependent Claim
146 words
In a portable lift apparatus comprising a frame having a vertical mast, wheel means for supporting said frame so that it can be moved about, a loading platform, means connecting the platform to the mast for vertical movement up and down the mast, power means operatively connecting the frame and platform for moving the platform vertically. the improvement comprising: a rod vertically movable in said frame, a curvilinear cam eccentrically attached to said rod for rotation about a horizontal axis, said frame including an abutment above said cam and in contact therewith, means attached to said cam to rotate said cam about said horizontal axis whereby rotation in one direction forces said rod downwardly and rotAtion in the other direction permits said rod to move upwardly with respect to the frame, and means connecting one of said wheel means to the lower end of said rod.
Claim 14
Dependent Claim
58 words
In an apparatus as set forth in claim 9, wherein said rod is cylindrical and is rotatable about a vertical axis with respect to said frame, said last mentioned means including a steering handle secured to said cam to permit a user to rotate said cam about said horizontal axis and rotate said rod about said vertical axis.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |