Improvements in Ball-bearings for Cycles
Year: 1899

page_text: JOHN BOYD DUNLOP and JOHN BOYD DUNLOr, Junior, Ailesbury Road, Dublin,
Gentlemen, do hereby declare the nature of this invention to be as follows:-
This invention relates to cup-adjusting bearings for cycles and its object is
to secure the cups by simple and efficient means.
In cup-adjusting cycle hubs it has been found that right cups having right han 1
threads and left cups having left hand threads, have a tendency to screw in-
ward; whereas, in crank brackets right cups having left hand threads and left
cups having right hand threads have a tendency to screw inward.
We therefore prefer to use such threads, as above described, on the cups of
lubs and crank brackets, and we prevent the cups screwing in too far by means
of collars, or lock rings, on the cups. We prefer to have the fixed cups on the
right side of both hubs and crank brackets and provide them with collars or
shoulders, preferably conical.
The adjusting cups which are preferably on the left side are provided with
lock rings.
The threads on the adjusting cups are preferably buttress, or a modified V
one side of the thread being inclined more than the other, for the purpose of
increasing the friction between the cup and the hub or bracket and thus prevent
the cup turning when the lock ring is being screwed home.
Dated this 4th day of September 1899.
JOHN BOYD DUNLOP,
JOHN BOYD DUNLOP, JUNIOR,
Improvements in Ball-bearings for Cycles.
JOHN BOYD DUNLOP and JOHN BOYD DUNLOP, Junior, Ailesbury Road, Dublin,
Gentlemen, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
This invention relates to cup-adjusting bearings for cycles, and its object is
to secure the cups in a simple and efficient manner.
In cup-adjusting cycle hubs it has been found that right cups having right
hand threads and left cups having left hand threads have a tendency to screw
inwards whereas, in crank brackets, right cups having left hand threads and
left cups having right hand threads have a tendency to screw inwards. We
D

page_text: therefore use right and left hand threads, as above described, on the cups
of hubs and crank-bracket, and we prevent the cups screwing in too far by means
of collars or lock-rings on the cups. We prefer to have the fixed cups on the
right side of hubs and crank-bracket and provide them with collars or shoulders.
The adjusting cups which are preferably on the left side are provided with lock-
rings.
The threads on the adjusting cups are preferably buttress, or inclined V
threads, for the purpose of increasing the friction between the cups and the hubs,
or between the cup and the crank-bracket, and thus prevent the cup turning when
the lock-ring is being screwed home.
A
The hubs and the bracket are of the usual cup-adjusting pattern, but we dis-
pense with the usual cotter pins for locking the cups in the crank-bracket.
The accompanying drawing is a section of the left side of a crank bracket.
is the bracket shell. B is the adjusting cup provided with inclined threads C.
D) is the lock-ring for locking the cup in the bracket shell.
Having now particularly described and ascertained the nature of our said in-
vention, and in what manner the same is to be performed, we declare that what
we claim is: -
1. In a cycle crank-bracket a cup in the right side having left hand threads,
and an adjusting cup in the left side having right hand threads, in combination
with a lock ring such as D.
2. In a cycle hub a cup in the right side having right hand threads, and an
adjusting cup in the left side having left hand threads, in combination with a
lock ring such as D.
3. In a cycle crank-bracket or hub, an adjusting cup having inclined threads
such as C in combination with a lock-ring such as D.
Dated this Second day of June 1900.
JOHN BOYD DUNLOP,
JOHN BOYD DUNLOP, JUNIOR.