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US 7,909,561 B2Granted
Tow truck with underlift control
AssigneeJerr-Dan Corporation
InventorsJeffrey L. Addleman, Bradley S. Kresge
Life of this patent
Estimating the term…
Abstract
A vehicle includes a chassis and an underlift supported by the chassis. The underlift includes a boom including a vehicle engaging device coupled to the boom and a movement actuator for moving the boom. The underlift further includes a control system configured to restrict actuation of the movement actuator when the boom moves to a predetermined position; and an operator control coupled to the control system that allows the operator to control the movement actuator after actuation of the movement actuator has been restricted.
Claims20
A vehicle comprising:
- a chassis;
- an underlift supported by the chassis, the underlift comprising:
- a boom including a vehicle engaging device coupled to the boom;
- and
- a movement actuator for moving the boom;
- a control system configured to restrict actuation of the movement actuator when the boom moves to a predetermined position;
- an operator control coupled to the control system that allows the operator to control the movement actuator after actuation of the movement actuator has been restricted;
- and
- a position sensor that is a switch that breaks a movement actuating circuit between the operator control and the movement actuator,
- wherein the control system is configured to wait until the operator has released an operator control that was causing a downward motion before allowing the operator to then signal the movement actuator to actuate further downward.
7 more elements
A vehicle comprising:
- a chassis;
- an underlift supported by the chassis, the underlift comprising:
- a boom including a vehicle engaging device coupled to the boom;
- and
- a movement actuator for moving the boom;
- a control system configured to restrict actuation of the movement actuator when the boom moves to a predetermined position;
- an operator control coupled to the control system that allows the operator to control the movement actuator after actuation of the movement actuator has been restricted;
- and
- a position sensor that is a switch that breaks a movement actuating circuit between the operator control and the movement actuator,
- wherein the position sensor is a switch that resets when the boom has moved back to or above the predetermined position from a position below the predetermined location.
7 more elements
Dependencies are inferred from the claim text.