RU2243132C1 - Device for securing seat and other articles in aircraft - Google Patents

Abstract

FIELD: transport facilities; attachment of seats in aircraft.

SUBSTANCE: proposed device is located on upper of floor beam. It has body with hole for securing the seat leg to floor beam. Body is made in form of saddle mounted on upper web of beam embracing the seat leg; it has fasteners in form of screws whose heads are sunken in bottom of seat. Pressed in between seat leg and bottom of saddle is rubber gasket whose initial thickness exceeds amount of clearance.

EFFECT: simplified construction; enhanced maintainability; reduced corrosion.

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Description

The alleged invention relates to transport and can be used mainly for fastening seats and / or other goods to the floor beams of the aircraft.

A device is known for fastening a chair located on the floor of an aircraft, including a body and a stepped pin with a hole for fixing the legs of a chair (see AS USSR 416266, BI No. 7, 1974). The pin is inserted into the guide groove of the case, a spring-loaded sleeve is put on the pin, the protrusions of which enter the groove of the case and lock the pin. The position of the sleeve during installation or disassembly is adjusted using a pin, ring grooves and a longitudinal groove on the pin.

The disadvantage of this solution is the presence of a spring, the rigidity of which can decrease during operation (which reduces the reliability of the locking and the entire connection) or dust or dirt can accumulate between the turns (which will make disassembly difficult).

A device is known for fastening a chair and other cargoes in an airplane, located on the upper shelf of an airplane floor beam, including a housing with an opening for fixing a chair leg and elements for attaching a housing to an upper shelf of a beam (AS SU 1823372, BI No. 17, 1996 - prototype). The housing has two protrusions included in the dovetail groove of the upper shelf of the floor beam. One of the protrusions is made in conjunction with the housing, the second is movable and pushed to the housing and to the surface of the groove in the shelf with the help of special parts - lining, stopper and retainer, for locking the housing of the device relative to the upper shelf of the floor beam.

A disadvantage of the known solution is that due to vibration and dynamic loads, the interference in the connection may weaken, which will reduce reliability, when mounting or dismounting a chair, it needs to be shifted along the groove by half the pitch of the holes in the groove, while the practice of operating such joints often shows there is a bite of the protrusions in the dovetail groove, which complicates all operations with the chair. Each such biting is accompanied by damage to the groove surfaces, which causes corrosion of the beam made of aluminum alloy, in turn, corrosion complicates all operations with the device and reduces the life of the beam. The presence of a large number of parts clamping the device complicates the node and makes it difficult to work with it.

The objective of the proposed invention is to increase maintainability and reduce corrosion.

This goal is achieved by the fact that in the device for securing the seat and other cargoes in the aircraft, located on the upper shelf of the beam of the floor of the aircraft, the body is made in the form of a saddle mounted directly on the upper butt of the beam and covering the leg of the chair, while screws with heads recessed into the bottom of the seat, and between the leg of the chair and the bottom of the seat with screw heads a rubber gasket is clamped, the original thickness of which is greater than the gap.

The saddle-shaped housing, mounted directly on the upper shelf of the beam, dramatically simplifies the design and its maintenance, since there is no need to make a dovetail groove, which often bites the device for fastening during installation or dismantling, and the grip of the chair leg itself increases the saddle body itself reliability and rigidity of the connection. The use of screws as fastening elements provides a more reliable and maintainable connection than a spring-loaded (analog) or clamped (prototype), screw heads recessed into the bottom of the saddle do not create obstacles during installation or dismantling, and a rubber gasket sandwiched between the leg of the chair and the bottom saddles with screw heads, gives three effects at once: it absorbs the seat, protects the screws from self-unscrewing and from corrosion.

The proposed device for securing a seat and other cargoes in an airplane is shown in FIG. 1 — a vertical section along the seat fasteners, transverse to the floor beam.

A device for securing the chair and other loads is located on the upper shelf 1 of the beam 2 of the floor of the aircraft and includes a housing 3 with holes 4 for fastening 5 legs 6 of the chair or cargo and elements 7 for attaching the housing 3 to the upper shelf 1 of the beam 2. Housing 3 is made in the form of a saddle installed directly on the upper shelf 1 of the beam 2 and covering the leg 6 of the chair. As the fastening elements 7 of the housing 3, screws with heads 8 are used, recessed into the bottom 9 of the seat body 3, and between the leg 6 of the chair and the bottom 9 of the seat body 3 with heads 8 of screws 7 a rubber gasket is clamped 10. The gasket 10 is clamped so that that its initial thickness is greater than the size of the gap (which would be without gasket 10) between the leg 6, hanging on the fasteners 5, and the bottom 9 of the seat 3.

On the casing-saddle 3 protrusions 11 are made to press the flooring 12 of the floor to the upper shelf 1 of the beam 2.

The longitudinal length of the housing 3 corresponds to the size of the legs 6. The screws 7 are usually located in a checkerboard pattern.

When the device is operating, loads from the leg 6 of the chair to the beam 2 are transmitted through it. In this case, the rubber gasket 10 transfers part of the load in any direction from the leg 6 directly to the bottom 9 of the seat body 3, thereby partially unloading the fastener 5 installed in the holes 4, and damping dynamic forces. This facilitates the working conditions of the fastener 5 and increases the reliability of the device as a whole.

Since the heads 8 of the screws 7 are covered from above by a pressed rubber gasket 10, their self-unscrewing is excluded, in addition, the thread of the screws 7 is protected from moisture and corrosion,

The housing-saddle 3 is attached to the upper shelf 1 of the beam 2 with only two or three screws 7. The heads of 8 screws 7 are recessed into the bottom 9 of the housing-seat 3. The protrusions 11 press the flooring 12 to the upper shelf 1 of the beam 2, serve as additional support for the housing- saddles 3, and also reduce the possibility of penetration of moisture and corrosion under the device.

Thus, the application of the totality of the features of the alleged invention ensures the achievement of the task - to increase maintainability and reduce corrosion. An additional effect is an increase in the reliability of fastening.

Claims (1)

A device for securing a seat and other cargoes in an airplane, located on the upper flange of an airplane floor beam, including a housing with an opening for securing the legs of the seat and fastening elements of the housing to the upper flange of an airplane floor beam, characterized in that the casing is made in the form of a saddle mounted directly on the upper shelf of the beam of the floor of the aircraft and covering the leg of the chair, with body fastening elements in the form of screws with heads recessed into the bottom of the seat, and a rubber clip is clamped between the leg of the chair and the bottom of the seat with screw heads adka, the initial thickness of which is greater than the gap.