Improvements in Parts of Disc Bearings for Cycles and other Wheeled Vehicles.
Year: 1898

page_text: Date of Application, 23rd May, 1898
Complete Specification Left, 19th Sept., 1898-Accepted, 22nd Oct., 1898
Improvements in Parts of Disc Bearings for Cycles and other
Wheeled Vehicles.
I, OLAF PIHLFELDT, of Golden Hillock Road, Small Heath, in the City of
Birmingham, Engineer, do hereby declare the nature of this invention to be as
fellows:
This invention has relation principally to the disc or cup-locking bolts or
cotter pins of disc bearings for cycles and other road vehicles, and also to certain
parts of the said bearings.
Disc-locking bolts for cycle bottom brackets and the like, as heretofore made,
consist of a screw-ended shank, and a long cylindrical head of larger diameter
than the shank and with a portion near the shoulder at the junction of the head
and shank shamfered off and curved to the radius of the periphery of the cup
to be locked. That part of the shamfer nearest to the shoulder is the broadest
and thence gradually diminishes down to the normal circumference of the head.
These bolts are designed to fit within corresponding sleeves or long eyes made
on the outside of the casing of the bottom bracket or the like, and having
internal gaps through which the shamfers of the pins impinge against the screwed
edges of the discs or cups to be locked.
A considerable draw back to the use of these locking bolts is that they require
to be knocked partly out of their sleeves after the nuts have been slackened, before
the discs can be turned for re-adjustment.
The object of my invention is to obviate this defect and to provide cup-locking
bolts which are self-freed on the slackening of their nuts, so that the cups or
discs may be re-adjusted without having to clear or free the bolts by tapping
them back.
According to my invention, the locking bolt consists of a shank, screwed at one
end and terminated at the other end in a D-sectioned head, with the curved back
of it coming flush with the shank whilst the flat front side is parallel cross
shamfered from the shoulder to about the middle. The sleeves or long eyes which
are to receive these bolts, are, at their upper ends, of a shape corresponding to the
cross section of the part of the head above the shamfer, and the lower ends pierced
to correspond to the cross section of the stem, whilst the inner walls of the sleeves
are chamfered out to clear the shank of the pin on all sides and also all-through
gapped into the body of the bracket to admit of the shamfer on the head advanc-
ing towards and impinging against the screwed edges of the cups or discs to be
locked. A nut takes upon the protruding screwed end of the pin, which, by
reason of the shape of its head, is incapable of rotation but makes a traversing
movement only within the irregular shaped sleeve as a race, on the nut being
screwed up against the bottom end of the said sleeve as an abutment.
When it is required to release a disc or cup for re-adjustment it is only neces-
sary to slack the nut, when the bolt is self-freed from locking contact with the

page_text: wormed periphery of the disc, owing to the shamfer of it impinging upon only
a narrow lateral portion of the threads of the same.
Dated this 20th day of May 1898.
OLAF PIHLFELDT,
By Henry Skerrett,
Agent for Applicant.
Improvements in Parts of Disc Bearings for Cycles and other
Wheeled Vehicles.
I, OLAF PIHLFELDT, of Golden Hillock Road, Small Heath, in the City of
Birmingham, Engineer, 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 has relation principally to the disc or cup-locking bolts or
cotter pins of disc bearings for cycles and other road vehicles, and also to certain
parts of the said bearings.
Disc-locking bolts for cycle bottom brackets and the like, as heretofore inade,
consist of a screw-ended shank, and a long cylindrical head of larger diameter
than the shank and with a portion near the shoulder at the junction of the head
and shank shamfered off and curved to the radius of the periphery of the cup
to be locked. That part of the shamfer nearest to the shoulder is the broadest
and thence gradually diminishes down to the normal circumference of the head.
These bolts are designed to fit within corresponding sleeves or long eyes mado
on the outside of the casing of the bottom bracket or the like, and having
internal gaps through which the shamfers of the pins impinge against the screwed
edges of the discs or cups to be locked.
Å considerable draw back to the use of these locking bolts is that they require
to be knocked partly out of their sleeves after the nuts have been slackened, before
the discs can be turned for re-adjustment.
The object of my invention is to obviate this defect and to provide cup-locking
bolts which are self-freed on the slackening of their nuts, so that the cups or
discs may be re-adjusted without having to clear or free the bolts by tapping
'them back.
66
Figure 1 of the accompanying drawing represents a horizontal section of a
cycle crank-axle or bottom" bracket, the bearing cups of which are secured in
their adjusted positions by self-freeing locking pins constructed according to
my invention.
Figure 2 is an end elevation of the said bracket, with the pedals and sprocket
wheel removed.
Figure 3 represents, partly in plan, partly in horizontal section on the dotted
line, Figure 2, and upon an enlarged scale, the said bracket.
Figure 4 is a cross section of Figure 3 upon the dotted line a¹, but with both
the bearing cup and the locking pin removed, showing the shape of the pin-
sleeve of the barrel.
Figure 5 is a longitudinal section of one end of the said barrel, taken upon the
dotted line 3, Figure 4, and looking in the direction of the arrow in order to
show the extent of the gap leading from the hole in the sleeve into the inside of
the barrel.
Figure 6 is a like section as Figure 5 but showing the locking pin in position
within its sleeve.
1
...A

page_text: Figure 7 is an end elevation of the bracket with a portion of the walls in section
showing the head of the locking pin impinging against the wormed periphery
of the bearing cup.
Figure 8 represents side and front elevations of one of the locking pins
separately.
Figure 9 represents top and bottom end views thereof.
Figure 10 is an elevation of the nut which takes onto the screwed end of the
lock pin.
The same letters of reference indicate corresponding parts in the several figures
of the drawings.
According to my invention the locking bolt a, as represented in the said draw-
ings consists of a shank a¹, screwed at one end a³, and terminated at the other
end in a D-sectioned head a³, excentrically disposed relative to the shank, and
with the curved back at, of it coming flush or in a line with the said shank whilst
the flat front side a³, is parallel cross shamfered at a, from the shoulder a', to
about the middle. The sleeves or long eyes b, which are formed in the front of
the barrel c, of the bottom bracket receive these bolts, are, at their upper ends b,
of a D-shape in plan, corresponding to the cross section of the part of the pin
head a³, above the shamfer and the lower ends are bored with holes, which
correspond to the cross section of the shank or stem a', whilst the inner walls of
the upper part of the said sleeves are chambered out to clear the shank of the
pin on all sides and also all-through gapped at c', with clearances leading into the
body of the bracket to admit of the shamfer on the head advancing towards and
impinging against the screwed edges d', of the cups or discs d, to be locked.
nut e, takes upon the protruding screwed end a², of the pin, which, by reason of
the shape of its head, is incapable of rotation but makes a direct traversing move-
ment only within the irregular shaped sleeve as a race, on the nut being screwed
up against the bottom outside end, of the said sleeve as an abutment.
A
When it is required to release a disc or cup for re-adjustment it is only neces
sary to slack the nut, when the bolt is self-freed from locking contact with the
wormed periphery of the disc, owing to the chamfer of it impinging upon only
a narrow lateral portion of the threads of the same.
Having now particularly described and ascertained the nature of said
my
invention, and in what manner the same is to be performed, I declare that what
I claim is:
-
A screwed cotter or locking pin for parts of cycles and other wheeled vehicles,
having an excentrically disposed head, provided with a contact shamfer on the
one side, and longitudinally sliding within a guide-sleeve of a shape corresponding
to the cross section of the outer end of the head, substantially as and for the pur-
pose described and set forth.
Dated this 17th day of September 1990.
OLAF PIHLFELDT,
By Henry Skerrett,
24, Temple Row, Birmingham, Agent for Applicant.