Patent Application
20130240057
None.
This invention relates to a powered reel apparatus for storage and deployment of duct for the supply of pre conditioned air for the heating and cooling of the interior of an aircraft while parked at an airport.
Commercial aircraft are equipped with an auxiliary power unit, or APU, to supply electrical power while the aircraft is parked on the ground and the engines are not running. A function of the APU is to power the aircraft on-board air conditioning system, however, the APU is a source of both high noise and also high carbon emissions. Recently most airports have come under the directive of regulations targeting a reduction in noise and also a reduction of the carbon pollution, and as a result, it is now required to shut down the aircraft engines and the APU and to supply pre conditioned air from an external source to aircraft parked at a terminal during the unloading and loading interval.
These pre conditioned air sources can be portable units mounted to a trailer or integrated to a vehicle platform, or stationary mounted units attached to the jet-bridge or terminal building. If the unit is portable it is simply driven to close proximity of the aircraft and a short duct is coupled between the portable air source and the aircraft inlet to convey the pre conditioned air. If the unit is stationary, however, then the problem of conveying the pre conditioned air to the aircraft is not so easily solved.
In U.S. patent to Anderson et al, U.S. Pat. No. 3,399,545, there is disclosed a longitudinally expandable duct system that is mounted to the underside of a telescoping passenger loading bridge. The position of two points of the duct is fixed relative to two moveable sections, preferably the end sections, of the bridge. Thus the bridge and the duct are integrated in a single unit, both expanding together for use, and contracting together for storage. A supporting cable extends through the interior of the duct along the top surface thereof between the two relatively fixed points. Preferably the cable is fastened on one end, and the other end is wound on a reel maintaining a substantially constant tension on the supporting cable.
In U.S. patent to Krzak, U.S. Pat. No. 4,357,860, there is disclosed a telescoping conduit for directing air at moderate pressures to a waiting aircraft along a telescoping bridge. The telescoping conduit includes a number of telescoping tubes suspended beneath the segments of a telescoping bridge. The tubes are coaxially supported below the bridge walkway by adjustable brackets, and one tube is mounted to each bridge segment. This means of suspension allows the tubes to telescopically extend and retract, or nest, to a maximum degree while providing support for the tubes at each end. The tubes are sealed typically with an O-ring at one end of each tube. The sealing portion of the tube, around which the O-rings are seated, is made of a somewhat flexible material which acts as a bearing and accommodates slight misalignment. A roller cage acts to center the nesting tubes so that a wiper seal between the tubes does not become permanently deformed.
The aforementioned two patents disclose an apparatus meant to convey the pre conditioned air duct to the end of the passenger bridge, however, the air inlet connector on the aircraft may be a distance of up to 100 feet away. And a means of deploying and storage of the duct is not yet solved.
As can be expected pre conditioned air duct can be rather large to accommodate the necessary airflow to control the internal environment of a large aircraft. For example, these hoses can have an inner diameter on the order of 8 inches to 14 inches. It can be appreciated that these ducts, due to their diameter and their length, can be quite heavy, and weigh in excess of 75 pounds. Operators must move these heavy ducts across the surface of the airport tarmac and wind them up to store them between aircraft.
Referring to U.S. patents to Bombardi et al, U.S. Pat. No. 6,776,705, U.S. Pat. No. 6,821,201, and U.S. Pat. No. 6,834,668, there is disclosed an apparatus for supplying conditioned air for heating and cooling to an aircraft. The apparatus has a container having a length defined by a first end and a second end. A flexible hose is provided within the container and a retractor may engage the hose and pull the hose from the container. The container may deliver the hose to the aircraft via the retractor. In addition, the retractor may also retract the hose into the container when the hose is not needed. The retractor may be released from the hose and the container, allowing the hose to be pulled manually from the container.
The Bombardi patents disclose pre conditioned air systems that are mounted to the passenger bridge and deploys the amount of hose required to suit the length of a particular aircraft, however, the system is technically complex with many moving parts and drive belts that can wear and break. Additionally, these types of systems are relatively expensive.
Other commercial devices are available to provide storage to the pre conditioned air duct between the departure of one aircraft and the arrival of the next. These types of electrically driven storage and deployment devices consist of chain driven spools that utilize bicycle type chain, sprocket gears, and pinion gears connected to a motor for the drive system. End of travel limit switches are provided to stop the drive system when the duct is fully deployed or fully retracted and these limit switches are mechanically actuated via additional chains, sprockets, and an acme screw device. While comparatively less expensive than the Bombardi style systems, these types of systems are maintenance intensive and care has to be taken to grease the chain and drive systems regularly and adjust the chain tension due to chain stretching over time.
A need, therefore, exists over the prior art, for a relatively inexpensive, low maintenance, and easily configurable storage and deployment system for duct used in the supply of pre conditioned air for the heating and/or cooling of the interior of commercial aircraft while parked at the airport terminal.
The pre conditioned air duct reel apparatus includes a mounting frame rotatably supporting a plenum reel assembly comprising a first side frame mounting an electric reversible gear drive assembly, the plenum reel assembly first end drivenly connected to the gear drive shaft. The axially opposite, second side frame mounts a rotary air swivel mechanism having a rotary inner portion fixedly connected to the plenum reel assembly second end about an opening corresponding to the internal diameter of the rotary air swivel rotary inner portion, the rotary air swivel mechanism having a stationary outer portion that rotatably mounts the plenum reel second end to the second side frame about an air inlet opening corresponding to the internal diameter of the air inlet swivel mechanism. Adjustable rotary limit switch cams are provided to control limit switches to de-energize the reversible drive motor at the limit of travel for the duct deployment or retraction to prevent over winding or under winding of the duct.
Additional features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with references to the accompanying drawings in which like characters represent like parts throughout the drawings.
Referring generally to
It should be appreciated by one skilled in the art that pre conditioned air ducting 5 is generally constructed of a heavy duty fabric material and will be flat when not being pressurized by the pre conditioned air to be supplied to aircraft 1. Pre conditioned air ducting 5 may be configured in any length required in order to reach air conditioning inlet 7, and duct reel apparatus 3 sized accordingly to store this required length. Duct reel apparatus 3 is configured to connect to a pre conditioned air delivery system and may be attached to a passenger bridge or to a fixed location, such as a terminal building, or mounted to a mobile cart, or vehicle. Pre conditioned duct assembly 5 must be disconnected at air inlet 7 from aircraft 1 and retracted and stored on duct reel apparatus 3 when aircraft 1 is in motion, such as when it taxis to and from a terminal. When aircraft 1 is parked, pre conditioned air ducting 5 is deployed from the duct reel apparatus 3 and connected to the aircraft 1 at aircraft inlet 7 to alleviate the need for the use of the air conditioning system of aircraft 1 itself.
Referring now to the drawings, and particularly to
A reversible electric gear drive assembly 21 is fixedly attached to side frame 11A and gear drive mount bracket 36 by mount bolts 68 attached to gear drive housing 24. As electrical power is applied to drive motor 32, motor shaft 72 fixedly connected to worm gear 70 rotate gear drive hollow shaft 28 rotatably mounted within gear drive bearings 22 and fixedly attached to drive shaft 26. The axis of rotation of drive shaft 26 is coextensive with the axis of rotation of plenum reel assembly 12. A first and second limit switch cam 40 is rotatably adjustable about the center of limit switch rotary shaft 38 to actuate a corresponding first and second limit switch 42 fixedly attached to limit switch mount 44, mounted internal to limit switch cover 34. Limit switch rotary shaft 38 drivenly connected to the axis of rotation of plenum reel assembly 12 at a fixed ratio allowing the plenum reel assembly 12 to rotate the number of times to retract or deploy the length of pre conditioned air ducting 5 before limit switch rotary shaft 38 revolves one time causing limit switch cam 40 to actuate limit switch 42 and de-energizes the motor. Limit switches 42 being electrically connected to an external control means (not shown), a first limit switch cam 40 is adjusted to actuate a first limit switch 42 for controlling the number of revolutions of plenum reel assembly 12 in a first direction, a second limit switch cam 40 is adjusted to actuate a second limit switch 42 for controlling the number of revolutions of plenum reel assembly 12 in an opposite direction to prevent over winding or unwinding of the pre conditioned air ducting 5 as the duct is retracted or deployed to aircraft 1. As the motor is energized to rotate the plenum reel assembly 12 in a retracting or winding direction the duct is pulled across the ground or airport tarmac and is collapsed to a flat state as it is wound about the reel until the length is fully retracted and limit switch 42 de-energizes the motor. If the motor is energized to rotate the plenum reel assembly 12 in the opposite angular direction, the duct is deployed or unwound from the reel until the corresponding limit switch 42 de-energizes the motor.
Air inlet rotary swivel assembly 48 has an outer race 50 disposed radially around inner race 52 axially connected by air inlet bearing 56 being mounted in grooves formed on the inward radial face of outer race 50 and corresponding grooves on the outer radial face of inner race 52. Inlet bearing 56 consisting of an engineered polymer such as a grease impregnated nylon material to minimize friction and allow the outer race to rotate freely and coextensively about the inner race. Inner race 52 is fixedly mounted to swivel spacer mount 54 and side flange 13B by a number of inner race bolts 58 and inner race nuts 60, side flange 13B having an opening corresponding to inner race 52 internal diameter to allow pre conditioned air to flow freely into plenum reel assembly 12. Outer race 50 is fixedly mounted to side frame 11B and air duct inlet adaptor 16 with a number of outer race bolts 66 and outer race nuts 64, side frame 11B and air duct inlet adaptor 16 having an opening corresponding to the outer race 50 internal diameter to allow pre conditioned air to flow freely into the plenum reel assembly 12 from an external air conditioning apparatus (not shown) connected to air duct inlet adaptor 16. Due to the provision of the air inlet rotary swivel assembly 48 the air inlet at the air inlet duct adaptor is not rotated while remaining in pressurized communication with the plenum reel assembly 12 as it is rotated in a deploying or retracting direction. Plenum reel assembly 12 comprising an internal air chamber directing air flow from a fixed air duct inlet adaptor 16 to a rotatable air duct outlet adaptor 14, and an external surface for the winding and storage of pre conditioned air ducting 5 when not required for providing pre conditioned air to waiting aircraft 1.
While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains.
