Interactive clamp force control system for load handling clamps

• US 8,781,618 B2
• Filed: 11/05/2013
• Issued: 07/15/2014
• Est. Priority Date: 10/29/2012
• Status: Active Grant

• Current Assignee: Cascade Corporation
• Original Assignee: Cascade Corporation
• Inventors: McKernan, Pat S., Nagle, Gregory A.
• Primary Examiner(s): CUMBESS, YOLANDA RENEE
• Application Number:
  US14/072,660
• Publication Number:
  US 20140121825A1
• Time in Patent Office: 252 Days
• Field of Search: None
• US Class Current: 700/213
• CPC Class Codes: B66F 9/183 Coplanar side clamps
• CPC Class Codes: B66F 9/20 Means for actuating or controlling masts, platforms, or forks power take-off from vehicle transmissions, combined with vehicle propulsion systems B60K
• CPC Class Codes: B66F 9/22 Hydraulic devices or systems

Abstract

Improvements are disclosed for a load-clamping system with variable clamping force control by which a wide variety of dissimilar loads of different types, geometric configurations and/or other parameters can be accurately clamped at respective variable optimal clamping force settings. An operator terminal cooperates with a controller to translate one or more possible load parameters into a form easily discernible visually by a clamp operator and preferably easily comparable by the clamp operator, from his visual observation, to each particular load which he is about to engage, so that the clamp operator can interactively guide the controller in its selection of an optimal clamping force setting for each particular load.

Claims

1. A control system comprising:

(a) a controller for a load-handling clamp having load-engaging surfaces, at least one of said surfaces being selectively movable toward another of said surfaces by a hydraulic clamp capable of applying a clamping force to a load in response to receipt of hydraulic fluid introduced at a variable pressure from a clamp control valve to said hydraulic clamp;

(b) a pressure regulating valve capable of varying said variable pressure in response to said controller; and

(c) a flow control valve, different from said pressure regulating valve, interposed operably between said clamp control valve and said hydraulic clamp so as to limit a flow rate of said hydraulic fluid to said hydraulic clamp from said clamp control valve.

2. The control system of claim 1 wherein said flow control valve is a priority flow control valve having a limited priority flow rate operable to limit said flow rate of said hydraulic fluid to said hydraulic clamp while said priority flow control valve bypasses excess flow from said clamp control valve away from said hydraulic clamp.