Hydraulic winch control mechanism

• US 3,249,336 A
• Filed: 06/18/1963
• Issued: 05/03/1966
• Est. Priority Date: 06/18/1963
• Status: Expired due to Term

• Current Assignee: Edwin C. Brown, Granville Woolman
• Original Assignee: Edwin C. Brown, Granville Woolman
• Inventors: Brown, Edwin C., Woolman, Granville
• Application Number:
  US04/288,795
• Time in Patent Office: 1,050 Days
• US Class Current: 212/288
• CPC Class Codes: B66C 13/18 Control systems or devices exclusively for rope, cable, or chain winding mechanisms B66D1/40
• CPC Class Codes: B66C 2700/062 mounted on motor vehicles
• CPC Class Codes: B66C 2700/065 with a slewable jib
• CPC Class Codes: B66D 1/08 incorporating fluid motors
• CPC Class Codes: B66D 1/14 Power transmissions between power sources and drums or barrels including brakes, one-way brakes, one-way clutches, clutches activated alternately with brakes, fixed ratio gearing unless otherwise provided for in B66D1/16 - B66D1/24
• CPC Class Codes: B66D 2700/0133 Fluid actuated
• CPC Class Codes: B66D 2700/0158 Hydraulically controlled couplings or gearings
• CPC Class Codes: B66D 2700/035 Fluid operated braking devices
• CPC Class Codes: B66D 5/26 pneumatic or hydraulic

Claims

1. A CONTROL MECHANISM FOR A REMOTELY OPERATED CABLE WIND ON A ROTATABLE CRANE BOOM COMPRISING, IN COMBINATION A REVERSIBLE HYDRAULIC MOTOR MOUNTING ON SAID BOOM AND COUPLED TO SAID WINCH FOR SELECTIVELY TAKING UP AND PAYING OUT THE CABLE THEREFROM, SAID MOTOR HAVING A PAIR OF HYDRAULIC SUPPLY AND RETURN LINES COUPLED THERETO, A SOURCE OF HYDRAULIC PRESSURE FLUID LOCATED REMOTELY FROM SAID BOOM AND SAID MOTOR, A ROTARY DISTRIBUTOR DEFINING SEPARATE PASSAGES FOR EACH OF SAID HYDRAULIC LINES INTERPOSED BETWEEN SAID SOURCE AND SAID MOTOR, A CONTROL VALVE FOR SELECTIVELY ADMITTING AND REVERSING THE FLOW OF HYDRAULIC PRESSURE FLUID THROUGH SAID HYDRAULIC LINES, A BRAKE MECHANISM MOUNTED ON SAID BOOM AND COUPLED TO SAID WINCH FOR STOPPING MOVEMENT THEREOF WHEN SAID MOTOR IS NOT OPERATED, SAID BRAKE MECHANISM HAVING A HYDRAULIC ACTUATOR FOR DISENGAGING SAID BRAKE, AND MEANS INCLUDING A SHUTTLE VALVE FOR COMMUNICATING HYDRAULIC FLUID TO SAID ACTUATOR UNDER THE INFLUENCE OF A PRESSURE DIFFERENTIAL IN SAID LINES TO RENDER SAID BRAKE MECHANISM INOPERATIVE INCIDENT TO OPERATION OF SAID MOTOR IN EITHER DIRECTION, SAID SHUTTLE VALVE BEING CONNECTED BETWEEN EACH OF SAID HYDRAULIC LINED AND SAIC ACTUATOR AND INCLUDING A BIDIRECTIONAL SLIDE ELEMENT WITH SUBSTANTIALLY EQUAL AREAS ON ITS OPPOSITE ENDS.