Vertically-storing dock leveler apparatus and method

• US 7,657,957 B2
• Filed: 10/02/2006
• Issued: 02/09/2010
• Est. Priority Date: 05/27/2003
• Status: Active Grant

• Current Assignee: 4Front Engineered Solutions Incorporated (Assa Abloy AB)
• Original Assignee: 4Front Engineered Solutions Incorporated (Assa Abloy AB)
• Inventors: Alexander, James C., Hoofard, Richard
• Primary Examiner(s): Hartmann; Gary S
• Application Number:
  US11/540,530
• Publication Number:
  US 20070017044A1
• Time in Patent Office: 1,226 Days
• Field of Search: 14/711, 14/713
• US Class Current: 14/71.3
• CPC Class Codes: B65G 69/2835 with spring-operated means
• CPC Class Codes: B65G 69/2841 extensible by pivoting parts

Abstract

A dock leveler for bridging the gap between a loading dock and the bed of a vehicle parked at the loading dock. The dock leveler is configured for installation on the top of the dock and is designed to rotate from a vertically-stored raised position to at least one lowered, operative position. In some embodiments, the dock leveler can be lowered either for normal operation so that the deck assembly rests on the bed of the vehicle or it can be lowered to accommodate an end-loading condition.

Claims

1. A dock leveler, comprising:

a base assembly mountable to a surface of a dock floor;

a deck assembly configured to rotate between a generally vertical stored position to one or more lowered operating positions, wherein the deck assembly is pivotally coupled to said base assembly;

a spring counterbalance assembly operatively connected to the deck assembly and base assembly, wherein the spring counter balance assembly causes the deck assembly to be downwardly biased throughout the generally horizontal working range, and the deck assembly to be upwardly biased at positions above the working range;

a lever mechanism configured to raise the deck assembly toward a generally vertical stored position; and

a foot actuator operatively connected to the lever mechanism wherein an operator may raise the lever mechanism to an operative position by placing a foot on the foot actuator.

2. A dock leveler according to claim 1, wherein the lever mechanism is configured to provide an increased mechanical advantage to raise the deck assembly when the deck assembly is downwardly biased in the generally horizontal working range, and wherein the lever mechanism has a reduced mechanical advantage to raise the deck assembly when the deck assembly is upwardly biased above the working range.

3. A dock leveler according to claim 1 further comprising a lip pivotally coupled to said deck assembly.

4. A dock leveler according to claim 3, wherein the lip is configured to rotate from an extended position generally parallel to the deck assembly to a retracted position generally perpendicular to the deck assembly.

5. A dock leveler according to claim 3 further comprising a latch configured to hold the lip in place.

6. A dock leveler according to claim 5 further comprising a spring biasing the latch to a latching position.

7. A dock leveler according to claim 3 further comprising:

an actuating member configured to move said lip with respect to said deck assembly; and

a receiver member secured to said lip for receiving said actuating member.

8. A dock leveler according to claim 7, wherein the receiver member is configured to allow the actuating member to rotate relative to the lip, such that the angle of the actuating member relative to the lip when the actuating member is urging the lip toward a retracted position is significantly different from the angle of the actuating member relative to the lip when the actuating member is urging the lip toward an extended position.

9. A dock leveler, comprising:

a base assembly mountable to a surface of a dock floor;

a deck assembly configured to rotate between a generally vertical stored position to one or more lowered operating positions, wherein the deck assembly is pivotally coupled to said base assembly;

a spring counterbalance assembly operatively connected to the deck assembly and base assembly, wherein the spring counter balance assembly causes the deck assembly to be downwardly biased throughout the generally horizontal working range, and the deck assembly to be upwardly biased at positions above the working range;

a lever mechanism configured to raise the deck assembly toward a generally vertical stored position; and

a ratchet mechanism configured to engage the lever mechanism and the deck assembly at more than one angle relative to one another, wherein the ratchet mechanism is configured to disengage the lever assembly from the deck assembly when the deck assembly is in the generally horizontal working range, and wherein the ratchet mechanism is configured to engage the lever mechanism with the deck assembly when the deck assembly is rotated above the working range.

10. A dock leveler according to claim 9, further comprising a foot actuator operatively connected to the lever mechanism wherein an operator may raise the lever mechanism to an operative position by placing a foot on the foot actuator.

11. A dock leveler according to claim 9, wherein the lever mechanism is configured to provide an increased mechanical advantage to raise the deck assembly when the deck assembly is downwardly biased in the generally horizontal working range, and wherein the lever mechanism has a reduced mechanical advantage to raise the deck assembly when the deck assembly is upwardly biased above the working range.

12. A dock leveler according to claim 9 further comprising a lip pivotally coupled to said deck assembly.

13. A dock leveler according to claim 12, wherein the lip is configured to rotate from an extended position generally parallel to the deck assembly to a retracted position generally perpendicular to the deck assembly.

14. A dock leveler according to claim 12 further comprising a latch configured to hold the lip in place.

15. A dock leveler according to claim 14 further comprising a spring biasing the latch to a latching position.

16. A dock leveler according to claim 12 further comprising:

an actuating member configured to move said lip with respect to said deck assembly; and

a receiver member secured to said lip for receiving said actuating member.

17. A dock leveler according to claim 16, wherein the receiver member is configured to allow the actuating member to rotate relative to the lip, such that the angle of the actuating member relative to the lip when the actuating member is urging the lip toward a retracted position is significantly different from the angle of the actuating member relative to the lip when the actuating member is urging the lip toward an extended position.