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The HISS does solve all of the problems that Mr Haines of registering the patent threw up a number of previous attempts to
encountered. However, consultation with industry specialists to date make an interlocking screw system. Most were complex and
has revealed potential for this invention far beyond its humble cumbersome and none achieved the goal.
beginnings. Take the components spin and pressure out of the The most challenging manufacturing feature of the HISS system is
equation and it opens up a world of new possibilities. The anticipated creating the shallow undercut in the screw recess. A number of
'initial' application for the HISS invention is that this recess be used as possible solutions have been suggested but the best to date has
a specialist screw; specifically as an aerospace fastener. The ability to come from German screw machine and tooling company Wafios
insert a Haines screw remotely and with no forward pressure is Umformtechnik via a 2 die, 3 blow header machine HC5FT. The
particularly relevant to a zero gravity environment. Other prime uses expected output on a commercial scale would be approximately 380
for the invention are for pipe clamps and hose clips (clamps often pieces per machine per minute. There would be geometrical
rotate during installation and a locking drive system would greatly compromises to production and the recess shape would likely be
expedite the removal and installation of these clamps), underwater square and not rectangular as illustrated because a symmetrical
fasteners and blind fastening and removal of fastener systems. shape would help control screw head malformation on the final blow.
This manufacturing rate may not be as high as for some traditional
How it works recesses, however the HISS represents a significant improvement in
The Haines screw works via series of interlocking lateral tapers. design. The lower production rate will put a premium on HISS screws,
Once engaged in either direction the lateral taper interlocks the driver however in the correct circumstances the associated benefits will
with the screw head. It is possible to alter the angle of undercut more than justify the cost. It is for this reason the invention is likely
depending on the desired level of interlock, however as it applies to to be marketed in the first instance, as a specialist screw. Mr Haines
screws the angles are far less than the diagrams indicate so the believes his invention simply shows a screw behaving as it should
driver disengages immediately when the power is released. The and firmly believes in a future where all screws interlock.
lateral tapers can apply to any shape driver and the screw head can We firmly believe the HISS system achieves something no other
adopt a number of alternative designs to accommodate the driver. recess has to date. The invention has just completed full registration
of the patent and the inventor is currently talking to a handful of
See diagram companies in different countries with the aim of licensing the
The HISS is covered by multiple patents, which include the manufacturing rights.
aforementioned changes in recess design. The patents allow us to If you would like more information regarding the invention, please
change the angle on the recess, and change the shape of the recess contact Lee Bartlett:
lee.bartlett@theperfectscrew.com, or on
so manufacturers can alter the design to fit their purpose. The process +44 7752 692 054.
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