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Automotive Door Handle

The customer was using a staked tubular rivet as a hinge pin for the handle and pawl in an automotive door handle application. The customer was experiencing problems with BSR (buzz, squeak and rattle) with the tubular rivet. They tried staking the rivet tighter to the assembly, however this caused cracking of the plastic boss. The customer approached SPIROL for a recommendation on a fastener that would eliminate the BSR problems that they were experiencing, as well as explore the possibility of a cost savings.

app coiled pin automotive door handle close up

SPIROL Coiled Spring Pins

SPIROL investigated use of both a Coiled Spring Pin and a Knurled Solid Pin. After much review, it was decided that the inherent design of the Coiled Pin would provide many benefits to the customer in this plastic door handle.

The Coiled Spring Pin is ideal for plastic applications because as it is inserted, the pin flexes and conforms to the host material and hole. This results in less damage to the host components than other non-flexible fasteners. In addition, since the Coiled Pin retains itself in the hole, secondary operations such as staking are not necessary. This elimination of the staking also reduces the likelihood for component damage. The spring-like action of the coils prevents component damage by absorbing the loads imparted to the assembly during and after installation.

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Coiled Spring Pins

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