Office Chair with Pivoting Back Rest
A major office furniture company designs and manufactures a wide range of office chairs, many with pivoting back rests. The back rest used a free fit machined pin retained with an e-clip as the hinge pin. Both the machined pin and the e-clip were installed manually. The installation of the retaining e-clip was time consuming and problematic. Once the pin was installed in the chair it left very little space for the assembler to install the e-clip and ensure that it was seated properly. Failure of a properly secured e-clip on the machined pin resulted in field failure as the main pivot pin would work its way out of the chair. SPIROL worked with the customer to help solve this warrantee problem and enhance their product quality.
In addition to their desire to eliminate the field failures and warrantee claims, the customer indicated that the back rest must freely rotate on the hinge pin. A cost target was provided which was the cost of the machined pin, and the e-clip. The cost of the assembly operation was not provided. However, the current design did not lend itself to being automated, and it was clear that the intricate, multi-step assembly operation was time consuming and prone to human error.