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Brompton Vouwfiets Manual

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SECTION H: OTHER DESIGN POINTS TO DO WITH FOLDING
Hook:
Correct function of the hook is important for
satisfactory folding: it retains the front wheel in
place when the bike is folded. It is attached to
the front mudguard stay (or, if there are no
mudguards, to a special wire form, not
illustrated). If it is knocked out of position, the
design allows it tobe bent back. For the function
to be correct:-1. The chainwheel mustn't be too
far out. Part of the stay, B (fig HK1), acts as a
buffer against the chain wheel during folding,
and steadies the folded front
1. The chainwheel mustn't be too far out. Part of
the stay, B (fig HK1), acts as a buffer against the
chain wheel during folding, and steadies the
folded front wheel. If the chainwheel lies too far
out (the gap G (fig HK4) between inside of chain
and hinge plate RHPL when the bike is parked,
should be 0-3mm, not more), then the hook will
be a tight fit over the chainstay CHS, and may
stick when trying to unfold the front wheel.
2. The hook must not be bent wrong (fig HK3): if
it is bent up too far, then a) it may catch on the
rear spokes, and b) it may slide off the tube
CHS, causing the bike to unfold inadvertently. If
it is bent down too far, then the hook will contact
the tube CHS at C before the front wheel (and
the rest of the bike) has dropped to its fully
folded position. If it is bent fore/aft it may strike
the chainwheel or (if fitted) the derailleur
changer, and if the stay is "crushed" in, the front
wheel spokes will clash with the chain tensioner
nut as the bike is folded.
If the hook is ineffective, and/or sticks during
unfolding, then, bearing the above in mind,
judicious bending of the wire stay (say by pulling
on the hook) should cure the problem.
fig. H3
… 19 …


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