Hold-down system for an aircraft towing vehicle

Details Hold-down system for an aircraft towing vehicle Hold-down system for an aircraft towing vehicle

1988-09-28

1990-04-17

Bucci, David A.

Material or article handling

Wheel and wheel-type article handler and transporter

Vertically swinging article engager

414430, B64F 122, B62D 4902

Patent

active

049175645

ABSTRACT:
An aircraft towing vehicle has a frame with a rearwardly opening, U-shaped recess for receiving the nose wheel of an aircraft. A lifting and securing mechanism is disposed within the recess and includes a ramp and a stop plate carried by the frame, a lifter which pushes the nose wheel from behind up the ramp into abutment with the stop plate, and a pivotable hold-down mechanism mounted above the ramp. In its rest position the hold-down mechanism is set at a distance from the ground which is less than the diameter of the smallest nose wheel of the types of aircraft that can be towed. It contacts the periphery of the nose wheel being engaged at an upper forward guadrant of the wheel's periphery and passively moves in tandem with the nose wheel as it is being pushed up the ramp into its secured position. At the end of the engaging operation, the hold-down mechanism applied a downwardly directed force of a predetermined magnitude against the nose wheel, which is generated by a hydraulic actuator. The pressure remains sealed in the hydraulic actuator so that the clamping force is applied to the nose wheel throughout the towing operation. A sensor is provided for detecting any pressure drop in the hydraulic actuator and triggering a corresponding alarm signal.

REFERENCES:
patent: 3049253 (1962-08-01), Cabral
patent: 3586187 (1971-06-01), Wright
patent: 4225279 (1980-09-01), Boyer
patent: 4375244 (1983-03-01), Morin
patent: 4632625 (1986-12-01), Schuller et al.
patent: 4655670 (1987-04-01), Hogberg et al.
patent: 4810157 (1989-03-01), Schopt

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