Variable counterweight system for a material handling device

• US 8,007,222 B1
• Filed: 05/31/2007
• Issued: 08/30/2011
• Est. Priority Date: 05/31/2007
• Status: Active Grant

• Current Assignee: ET&T ENGINEERING
• Original Assignee: ET&T Engineering LLP
• Inventors: Roden, Thomas V.
• Primary Examiner(s): UNDERWOOD, DONALD W
• Application Number:
  US11/756,069
• Time in Patent Office: 1,552 Days
• Field of Search: 414/719, 414/673, 280/758, 212/196, 212/197, 212/198
• US Class Current: 414/719
• CPC Class Codes: B66C 23/72 Counterweights or supports for balancing lifting couples
• CPC Class Codes: E02F 9/18 Counterweights for cranes B66C23/72, for tractors B62D49/085

Abstract

A variable counterweight system includes a counterweight and at least one linear transfer device. The counterweight preferably includes a plurality of individual counterweight members. Each linear transfer device preferably includes a moving track and a drive device. The moving track could be a chain or a belt. The drive device is preferably a hydraulic, electric or pneumatic motor. The moving track is preferably retained in a guide track. A control unit receives input from at least one vertical sensor. If an attachment or a boom is in an elevated position, then the control unit powers the at least one drive device to move the counterweight to a rear of the skid steer. If the attachment or boom is in a lowered position, then the control unit powers the at least one drive device to move the counterweight to a front of the skid steer.

Claims

1. A variable counterweight system for a material handling device having an arm that can be raised and lowered, comprising:

a counterweight including a plurality of weight members, wherein said plurality of weight members includes a plurality of pivoting weight members and a plurality of hanging weight members, each one of said plurality of pivoting weight members being pivotally secured to each horizontally adjacent pivoting weight member of said plurality of pivoting weight members, said plurality of hanging weight members being secured to said plurality of pivoting weight members; and

a drive arrangement for moving said counterweight from a front of the material handling device to a rear of the material handling device and back, wherein said counterweight can be positioned toward the front of the material handling device when the arm is in a lowered position, and wherein said counterweight can be positioned toward the rear of the material handling device when the arm is in an elevated position.