Hand/foot selector for electronic controls on a skid steer loader

• US 6,289,783 B1
• Filed: 06/02/1999
• Issued: 09/18/2001
• Est. Priority Date: 01/16/1996
• Status: Expired due to Term

• Current Assignee: Clark Equipment Company (Doosan Enerbility Company Limited)
• Original Assignee: Clark Equipment Company (Doosan Enerbility Company Limited)
• Inventors: Brock, Knute K., Sagaser, Thomas M., Brandt, Kenneth A., Jacobson, Scott B.
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): Lazo, Thomas E.
• Application Number:
  US09/324,409
• Time in Patent Office: 839 Days
• Field of Search: 914/27, 913/63.R, 914/53, 744/81
• US Class Current: 91/427
• CPC Class Codes: E02F 9/2004 Control mechanisms, e.g. control levers control levers per se G05G
• CPC Class Codes: E02F 9/2025 Particular purposes of control systems not otherwise provided for E02F3/16, E02F3/26, sub-groups of E02F3/43, E02F3/651, sub-groups of E02F3/84, E02F3/907, E02F5/145 take precedence
• CPC Class Codes: G05G 11/00 Manually-actuated control mechanisms provided with two or more controlling members co-operating with one single controlled member
• CPC Class Codes: Y10T 137/86622 Motor-operated
• CPC Class Codes: Y10T 74/2022 Hand and foot

Abstract

A control system controls actuation of a hydraulic cylinder on a skid steer loader. The control system includes a movable element, movable by an operator. A position sensor is coupled to the movable element and provides a position signal indicative of a position of the movable element. A controller is coupled to the position sensor to receive the position signal and provide a control signal based on the position signal. A valve spool controls flow of hydraulic fluid to the hydraulic cylinder. An actuator is coupled to the controller and the valve spool and moves the valve spool in response to the control signal from the controller.

Claims

1. A control system for controlling actuation of a hydraulic cylinder on a skid steer loader, the control system comprising:

a movable hand grip operably disposed within a cab portion of the skid steer loader;

a movable foot pedal operably disposed within a cab portion of the skid steer loader;

a first position sensor coupled to the movable hand grip and providing a first movable element position signal indicative of a position of the movable hand grip;

a second position sensor coupled to the movable foot pedal and providing a second movable element position signal indicative of a position of the movable foot pedal;

a user actuable selector, coupled to the first and second position sensors for selecting one of the movable hand grip and the movable foot pedal and providing a selector signal at its output indicative of the position of a selected one of the movable hand grip and the movable foot pedal;

a controller, coupled to the selector, to receive the selector signal, providing a control signal based on the movable element position signal;

a valve spool controlling flow of hydraulic fluid to the hydraulic cylinder; and

an actuator coupled to the controller and the valve spool, the actuator moving the valve spool in response to the control signal from the controller.

2. The control system of claim 1 wherein the selector comprises:

a switch assembly configurable to provide a user selected one of the first and second movable element position signals to the controller.

3. A control system for controlling actuation of a hydraulic cylinder on a skid steer loader, the control system comprising:

a movable hand grip;

a movable foot pedal;

a selector, coupled to the movable hand grip and the movable foot pedal and providing at its output an indication of a position of a selected one of the movable hand grip and the movable foot pedal;

a position sensor coupled to the selector to receive the indication and providing a first movable element position signal indicative of a position of the selected one of the movable hand grip and movable foot pedal;

an electronic controller, coupled to the selector, to receive the movable element position signal, providing a control signal based on the movable element position signal;

a valve spool controlling flow of hydraulic fluid to the hydraulic cylinder; and

an actuator coupled to the controller and the valve spool, the actuator moving the valve spool in response to the control signal from the controller.

4. A control system for controlling actuation of a hydraulic cylinder on a skid steer loader, the control system comprising:

a movable hand grip operably disposed within a cab portion of the skid steer loader;

a movable foot pedal operably disposed within a cab portion of the skid steer loader;

a first position sensor coupled to the movable hand grip and providing a first movable element position signal indicative of a position of the movable hand grip;

a second position sensor coupled to the movable foot pedal and providing a second movable element position signal indicative of a position of the movable foot pedal;

a controller, coupled to the first and second position sensors to receive the first and second movable element position signals;

a user actuable selector, coupled to the controller and providing a selection signal indicative of a selected one of the movable hand grip and the movable foot pedal, the controller providing a control signal at its output based on a selected one of the first and second movable element position signals;

a valve spool controlling flow of hydraulic fluid to the hydraulic cylinder; and

an actuator coupled to the controller and the valve spool, the actuator moving the valve spool in response to the control signal from the controller.

5. The control system of claim 4 wherein the selector comprises:

a toggle switch coupled to the controller, toggling of the toggle switch indicating a change in the selected one of the hand grip and foot pedal.

6. The control system of claim 4 wherein the selector comprises:

a depressible button.

7. The control system of claim 4 wherein the selector comprises:

a rotatable knob.

8. The control system of claim 4 wherein the selector comprises:

a keypad input.

9. The control system of claim 4 wherein the selector comprises:

a touch sensitive screen.

10. The control system of claim 4 wherein the controller is configured to access selection information to determine whether there has been a change in the selected one of the first and second movable element position signals.

11. A control system for controlling actuation of a hydraulic cylinder on a skid steer loader, the control system comprising:

a movable hand grip operably disposed within a cab portion of the skid steer loader;

a movable foot pedal operably disposed within a cab portion of the skid steer loader;

a first position sensor coupled to the movable hand grip and providing a first movable element position signal indicative of a position of the movable hand grip;

a second position sensor coupled to the movable foot pedal and providing a second movable element position signal indicative of a position of the movable foot pedal;

a selector, coupled to the first and second position sensors for selecting one of the movable hand grip and the movable foot pedal and providing at its output a movable element position signal indicative of the position of a selected one of the movable hand grip and the movable foot pedal;

a controller, coupled to the selector, to receive the movable element position signal, providing a control signal based on the movable element position signal;

a valve spool controlling flow of hydraulic fluid to the hydraulic cylinder; and

an actuator coupled to the controller and the valve spool, the actuator moving the valve spool in response to the control signal from the controller is allowable.

12. A control system for controlling actuation of a hydraulic cylinder on a skid steer loader, the control system comprising:

a movable hand grip;

a movable foot pedal;

a first position sensor coupled to the movable hand grip and providing a first movable element position signal indicative of a position of the movable hand grip;

a second position sensor coupled to the movable foot pedal and providing a second movable element position signal indicative of a position of the movable foot pedal;

a controller, coupled to the first and second position sensors to receive the first and second movable element position signals;

a user actuable selector, coupled to the controller and providing a selection signal indicative of a selected one of the movable hand grip and the movable foot pedal, the controller providing a control signal at its output based on a selected one of the first and second movable element position signals;

a valve spool controlling flow of hydraulic fluid to the hydraulic cylinder;

an actuator coupled to the controller and the valve spool, the actuator moving the valve spool in response to the control signal from the controller; and

wherein the controller is configured to access selection information to determine whether there has been a change in the selected one of the first and second movable element position signals.