An Improved Key for Securing Cranks, Wheels, and similarly Mounted Objects to Shafts or Spindles, in such Manner as to Render them Readily Detachable, such Improved Key being Specially Applicable to Velocipedes.
Year: 1885

page_text: An Improved Key for Securing Cranks, Wheels, and similarly
Mounted Objects to Shafts or Spindles, in such Manner as
to Render them Readily Detachable, such Improved Key
being Specially Applicable to Velocipedes.
I PHILIPP LOUIS CHARLES FREDERICK RENOUF of 46 Roland Gardens South
Kensington in the county of Middlesex Student of the Inner Temple do hereby
declare the nature of my invention for AN IMPROVED KEY FOR SECURING CRANKS,
WHEELS AND SIMILARLY MOUNTED OBJECTS TO SHAFTS OR SPINDLES IN SUCH
MANNER AS TO RENDER THEM READILY DETACHABLE, SUCH IMPROVED KEY BEING
SPECIALLY APPLICABLE TO VELOCIPEDES to be as follows:-
I cut along the shaft or spindle a recess or keyway of such a shape that two of
it's sides are parallel, but the third side or bed is deeper at one end than the other.
Before mounting the crank, wheel or other object to be similarly secured, a key is
fitted into the recess of the same proportions as the latter: it will be understood
that if the key be forced along from the deeper to the shallower part of it's bed,
it will rise away from the centre of the shaft or spindle and thus cause any object
embracing it to be firmly locked to the shaft. This locking motion may be
imparted to the key by means of turning a nut fitted over it's narrower extremity,
by a screw, or by a tapered cotter.
To detach from the shaft any object thereto secured by this process, the nut or
screw is turned back, or the cotter forced back: the key can then readily be
pressed back, so as to sink into the deeper part of the recess.
POPPLEWELL, COLTON & Co.,
Agents for the Applicant.

page_text: AD Improve доу
Mounted Objects to Shafts or Spindles, in such a Manner as
to Render them Readily Detachable, such Improved Key
being Specially Applicable to Velocipedes.
I PHILIPP LOUIS CHARLES FREDERICK RENOUR of 46 Roland Gardens, South
Kensington in the county of Middlesex, Student of the Inner Temple do hereby
declare the nature of my invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
The invention consists in the improved construction of the key or feather and of
the bed for containing and carrying the same on axles or other shafts or spindles
or studs, where it is desired to mount on the latter cranks chain wheels pulleys or
other similar objects in such a manner that they shall be firmly held by the key
or feather and yet be readily detachable without damage to the various parts of
the machine when their removal is necessary.
The accompanying drawings shew on Figure 1. a shaft a in section in which are
mounted a fly wheel c a pulley c¹ and a crank c¹. The front elevation of the fly
wheel, mounted, is shewn in Figure 2, and that of the crank in Figure 3.
It will be observed that in each case the keyway on the shaft is somewhat
shallower at the end from which the wheels or the crank are slipped over, sinking
gradually towards its further end. The keys are provided with a projecting screw,
or else are bored and tapped as shown in the case of 6. One face of the key is
shaped to fit the way on the shaft, whilst the face on the opposite side preferably
runs in a direction parallel to that of the shaft; the pulley c¹ or the wheel c or the
crank care provided with corresponding key ways and pushed over the shaft and
keys; the latter are then drawn up by means of the nuts d'and d¹ or the screw d
which will impinge against the bosses of the wheels or the crank; this process
makes the keys travel towards the shallower end of their beds and causes the
wheels and the crank to be firmly locked on the shaft.
When the wheels or the crank are to be removed, it is only necessary to remove
the nuts d and d¹ or the screw d¹¹ and strike the keys b, b₁ or 611; which will then
drop back into the deeper part of their beds, thus releasing the part to be detached.
It will be noticed that on the pulley c¹, the body of the key b₁ is deeper than
that of the other keys, which are at the extremities of the shaft, so allow the
screwed part may be at a sufficient distance to allow the nut d¹ to clear the surface
of the shaft.
The head of the screw is shown buried in a recess formed in the end of
shaft a and crank cll so as to leave no projecting part on the surface of the crank;
of course the same form of key as shown at 6 might be used, a recess being made
to receive the nut c.
The motion which causes the key to travel along the inclined plane formed at
the bottom of the keyway, may be imparted in a variety of ways, for instance a
part at the narrower end of the key may be left to project and be pierced, or this

page_text: end may be turned up as shown on b¹¹ in Figure 4; a taper cotter passed through
such a hole, or inside such turned up end, and impinging against a part of a shaft
or the object mounted thereon, will produce exactly the same effect as the nuts or
the screw above described.
If a key of my improved form be well fitted and the taper on one side be not too
great, it is not absolutely necessary in all cases to leave the nut, screw or cotter in
its position after drawing up the key, though it is desirable to do so; for should
vibration or any other accidental cause somewhat loosen the key, it will be
impossible for the crank or wheel to work off, the taper side holding the shaft and
the nut holding the wheel or crank; in case of such accidental looseness the crank
or wheel if working outward will press against the nut or screw head and thus
tend to tighten up the key.
Now I am aware that detachable keys have been used fitted into key beds
parallel with the direction of the shaft, but in these cases the slightest looseness
would allow the crank to work off together with the key, and also that other keys
have been used driven through the boss of a crank or wheel and at right angles to
the shaft, impinging against the latter over a small space only, and generally
necessitating clumsy projections, which may sometimes prove a source of danger;
but having particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is
1. A carrying key of such shape and construction that it is drawn up along an
incline formed in the key bed on the axle, shaft, spindle or stud, in a direction
parallel to such axle, shaft, spindle or stud, by means of a nut, screw or other
similar mechanical appliance, acting on the side from which the object to be held in
position, has been placed on the shaft.
2. The form of keys shown at b, 61 and 6 in the drawings and described in the
letter press, whether projecting, or buried in a recess on the object on which they
are mounted.
3. The form of key shown at b¹ in the drawings, and described in the letter press,
fixing an object at some distance from the extremity of a shaft.
POPPLEWELL, COLTON & Co.,
Agents for Applicant.