Self-Retaining Tinnerman Speed Clip Fasteners solve a host of Knob-to-Shaft assembly problems. They eliminate inserts and setscrews for reduced molding costs and easier, faster, assembly. Stresses are distributed evenly around the hub during application while the strength and durability of spring steel reinforces critical wearing points and harnesses cold-flow tendencies. Knob-to-Shaft fasteners can be removed and replaced repeatedly without danger of loosening or developing "knob-wobble".
Two basic fastener designs are available for standard applications. Compression Rings are for use on thermoplastic knobs with split hubs. They squeeze the hub around the shaft insuring firm, reliable retention. Round, D-shaped or Knurled Shafts can be used depending upon the hub cavity design. "C" Clips are recommended for die cast or thick-walled thermosetting plastic knobs. For use with D-shaped shafts only, they bear against the flat side of the shaft clamping it firmly within the hub cavity.
Where knob designs do not permit the use of either Compression Rings or "C" Clip, Speed Clip Fasteners are available, or can be designed to fit within the knob cavity.
How to apply Knob-to-Shaft Speed Clip Fasteners
A simple tool picks up and expands the Compression Ring. The end of the tool is placed over the knob hub and the ring is transferred from the tool to the outer circumference of the hub in one easy motion.
"C" Clip fasteners can be assembled over the hub with a similar tool or lightly rapped in place with a mallet. Data on these simple assembly tools is available on request.