Operable ramp

• US 8,943,631 B1
• Filed: 08/22/2014
• Issued: 02/03/2015
• Est. Priority Date: 01/10/2014
• Status: Active Grant

• Current Assignee: Lift-U
• Original Assignee: Lift-U
• Inventors: Morris, Donald, Johnson, David
• Primary Examiner(s): HARTMANN, GARY S
• Application Number:
  US14/466,883
• Time in Patent Office: 165 Days
• Field of Search: 414/921, 187/200, 521/83, 14/711, 14/713
• US Class Current: 14/71.3
• CPC Class Codes: B66B 9/08 associated with stairways, e.g. for transporting disabled persons facilitating access of invalids to vehicles A61G3/02
• CPC Class Codes: E04F 11/002 Ramps
• CPC Class Codes: E04F 2011/007 characterised by the supporting structure

Abstract

An operable ramp is moveable between a stowed position, a neutral position, and a deployed position. The operable ramp includes a ramp panel rotatably coupled at a first end about a first axis and a support that is rotatable in a first direction and a second direction about a second axis. A cam follower is coupled to the support and supportingly engages a second end of the ramp panel. Rotation of the support moves the cam follower along an arcuate path. The weight of the ramp panel biases the support in the second direction when the operable ramp is between the stowed position and the neutral position. A drive assembly selectively rotates the support in the first and second direction, and a stop limits rotation of the support in the second direction when the operable ramp is in the stowed position.

Claims

1. An operable ramp moveable between a stowed position, a neutral position, and a deployed position, the operable ramp comprising:

(a) a ramp panel rotatably coupled at a first end about a first axis;

(b) a support rotatable in a first direction and a second direction about a second axis,

(c) a cam follower coupled to the support and supportingly engaging a second end of the ramp panel, rotation of the support moving the cam follower along an arcuate path, wherein a weight of the ramp panel does not bias the support to rotate when the operable ramp is in the neutral position, the weight of the ramp biasing the support in the second direction when the operable ramp is between the stowed position and the neutral position;

(d) a drive assembly operably coupled to the support to selectively rotate the support in the first and second direction; and

(e) a stop limiting rotation of the support in the second direction when the operable ramp is in the stowed position.

2. The operable ramp of claim 1, wherein rotation of the support in the first direction lowers the second end of the ramp panel.

3. The operable ramp of claim 1, wherein rotation of the support in the second direction raises the second end of the ramp panel.

4. The operable ramp of claim 1, wherein the ramp panel forms a horizontal surface when the operable ramp is in the stowed position.

5. The operable ramp of claim 1, wherein the ramp panel extends downward from the first end to provide a sloped ramp surface.

6. The operable ramp of claim 1, wherein the stop extends downward from the ramp panel.

7. The operable ramp of claim 6, wherein the stop engages the cam follower when the operable ramp is in the stowed position.