Light system for lift gates

• US 10,688,903 B2
• Filed: 09/04/2015
• Issued: 06/23/2020
• Est. Priority Date: 09/08/2014
• Status: Active Grant

• Current Assignee: Maxon Industries Incorporated
• Original Assignee: Maxon Industries Incorporated
• Inventors: Marji, George Y., Ablabutyan, Karapet
• Primary Examiner(s): Elchanti, Hussein
• Application Number:
  US15/509,830
• Publication Number:
  US 20170305323A1
• Time in Patent Office: 1,754 Days
• CPC Class Codes: B60P 1/4414 and keeping the loading platform parallel to the ground when raising the load
• CPC Class Codes: B60P 1/4464 Warning signals, e.g. accoustic or visual
• CPC Class Codes: B60P 1/4471 General means for controlling movements of the loading platform, e.g. hydraulic systems
• CPC Class Codes: B60Q 1/305 Indicating devices for towed vehicles
• CPC Class Codes: B60Q 1/307 mounted on loading platforms

Abstract

An embodiment of a lighting device for a lift gate includes one or more sensors, each sensor configured to generate an output signal based on motion and/or orientation thereof, wherein each sensor is coupled to a movable member of the lift gate to generate an output signal indicating a motion and/or position state of said movable member of the lift gate; a controller circuit coupled to each sensor to receive an output signal from each sensor, wherein the controller circuit is configured to generate one or more control signals for controlling operation of one or more lighting elements; and one or more lighting elements coupled to the controller circuit to receive control signals from the controller circuit; wherein the controller circuit is configured to generate one or more control signals in response to the output signals from each sensor, for controlling operation of one or more lighting elements based on sensed state of the moveable member.

Claims

1. A lift gate, comprising:

a moveable member;

at least one lighting device mounted on the moveable member, wherein the lighting device includes;

a plurality of sensors, each sensor of the plurality of sensors configured to detect an orientation and/or motion, whereby each sensor of the plurality of sensors generates at least an output signal based on motion and/or orientation thereof, wherein each sensor of the plurality of sensors is coupled to the movable member at an orientation angle relative to the moveable member, wherein each sensor of the plurality of sensors is positioned at a different orientation angle than at least one other sensor of the plurality of sensors;

a controller circuit coupled to each sensor of the plurality of sensors to receive the output signal from each sensor of the plurality of sensors, wherein the controller circuit is configured to determine a state of the movable member of the lift gate based on the received output signals, and wherein the controller circuit is configured to generate one or more control signals for controlling operation of one or more lighting elements based on the state of the moveable member; and

one or more lighting elements coupled to the controller circuit to receive control signals from the controller circuit.

2. The lift gate of claim 1, wherein:

the lighting device is mounted on a moveable platform member of the lift gate, said moveable platform member comprising a foldable platform section; and

the sensor output signal of at least one of the plurality of sensors indicates an angular orientation of the foldable platform section as the foldable platform section moves during operation of the lift gate.

3. The lift gate of claim 1 wherein at least one sensor of the plurality of sensors is coupled to the movable member of the lift gate proximate each other sensor of the plurality of sensors.

4. The lift gate of claim 1, wherein the output signal is a binary output signal, wherein the controller circuit comprises a plurality of logic circuits configured to store state information based on the received output signal from at least one sensor of the plurality of sensors, and wherein the controller circuit is configured to generate one or more control signals for controlling operation of one or more lighting elements based on a logic sequence corresponding to movement of the movable member during operation of the lift gate.

5. The lift gate of claim 1, wherein the lighting device further comprises:

a circuit board for supporting the controller circuit, at least one sensor of the plurality of sensors and at least one lighting element;

wherein each sensor of the plurality of sensors is positioned to detect a different moveable member orientation range than other sensors;

wherein the controller circuit is coupled to at least one sensor of the plurality of sensors and to each lighting element via electrical paths on the circuit board; and

wherein the controller circuit is configured to generate one or more control signals in response to the output signals from at least one sensor of the plurality of sensors, for controlling light output of said one or more lighting elements to indicate different positions of said movable member as the moveable member moves during operation of the lift gate.

6. The lift gate of claim 1, wherein the output signal is a binary output signal, and wherein at least one sensor of the plurality of sensors is configured to detect motion relative to a selected rate and generate a motion signal based on said detected motion.

7. The lift gate of claim 1, wherein the lighting device further comprises:

an enclosure for housing one or more of;

the plurality of sensors and the one or more lighting elements, wherein the enclosure is configured for mounting on the moveable member.

8. The lift gate of claim 1, wherein:

the controller circuit comprises a programmable processor;

each sensor of the plurality of sensors is positioned to detect a different moveable member orientation range than other sensors.

9. The lift gate of claim 1, wherein the at least one lighting device comprises a first lighting device and a second lighting device, wherein the first lighting device is mounted on a first portion of the moveable member, and the second lighting device is mounted on a second portion of the moveable member.

10. The lift gate of claim 1, wherein the lighting device further comprises:

a circuit board for supporting the controller circuit, at least one sensor of the plurality of sensors and at least one lighting element.

11. The lift gate of claim 10, wherein each sensor of the plurality of sensors is positioned to detect a different moveable member orientation range than other sensors.

12. The lift gate of claim 11, wherein the controller circuit is coupled to at least one sensor of the plurality of sensors and to each lighting element via electrical paths on the circuit board.

13. The lift gate of claim 12, wherein the controller circuit is configured to generate one or more control signals in response to the output signals from at least one sensor of the plurality of sensors, for controlling light output of said one or more lighting elements to indicate different positions of said movable member as the moveable member moves during operation of the lift gate.