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Torque Limited Receptacle with Divided Nut

IP.com Disclosure Number: IPCOM000225975D
Publication Date: 2013-Mar-18
Document File: 4 page(s) / 162K

Publishing Venue

The IP.com Prior Art Database

Abstract

Basically the purpose of this invention is to allow a faster, easier and cheaper assembly process. Since it is almost impossible to misalign the screw joint, compared to the known solution, time-consuming aligning is no longer necessary. Furthermore a special tool to apply the asked torque is no longer needed as the receptacle itself limits the maximum applicable torque. Consequentially the manufacturing process of Airbus aircrafts, in the departments wherever the invention will be applied, can be improved in time and costs.

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Torque Limited Receptacle with Divided Nut

The technical field, for which the invention was developed, is related to the cargo compartment lining of aircraft. Since the invention is basically concerned with the mounting of two systems together via a screw joint, every other application field, in which this task has to be fulfilled, is imaginable.

The disadvantages of the currently used screw joint (Figure 1 and Figure 2) are difficulties during the installation and consequentially high installation times. That is because the service personal is not able to see the thread of the receptacle on which the stud has to be aligned. It is also not possible to pre-position the panel for an easier installation. These two facts raise the danger of a misalignment of the thread, which can cause damage, and/ or a faulty torque on the screw joint during installation. The proper torque is vital to ensure a permanent tightened attachment of the lining component and to avoid an unintentional loosening during operation. Additionally the sealing, which is attached to the panel and in contact with the secondary structure of the aircraft, needs to be maintained at an asked compression level to ensure an airtight installation. Therefore the torque should not be too low. If the torque gets too high, significant damages occur to the Panel. Furthermore it is currently necessary for the installation personal to use special tools such as a power driven screwdriver, which is torque limited. The application of this tool creates costs which could be reduced with the use of this invention.

             

Figure 1                                                                               Figure 2

(Refers to Figure 2) The yet used system contents of a housing (3) in which there is a threaded bolt (1) and a spring (5) that applies a force to two ribbed washers (6) causing them to stick together. When the stud will be tightened, one washer, tight fitted to the stud, rotates against the second washer, tight fitted to the housing, causing an alternating compression of the spring. This effect is used to secure the screw joint against self loosening.

Basically the purpose of this invention is to allow a faster, easier and cheaper assembly process. Since it is almost impossible to misalign the screw joint, compared to the known solution, time-co...