Improvements in Driving Chains for Velocipedes Motor-cars and the like.
Year: 1899

page_text: Date of Application, 30th Jan.,
1899
3
2000
Ofth
4000
PROVISIONAL SPECIFICATION.
Improvements in Driving Chains for Velocipedes Motor-cars and
the like.
I, ERNEST EDWARD BURGESS, of 38, High Street North, East Ham, Gentleman,
do hereby declare the nature of this invention to be as follows:
This invention relates to improvements in driving chains for velocipedes,
motor-cars and the like, the object being to obviate the danger and expense in-
curred in the use of the ordinary screw pin and nut employed for connecting
the extremities of such chains together, and to provide, to replace the said screw
pin and nut, a self-locking pin of extremely simple construction, which shall
allow of the parts being readily disengaged when required, at the same time
avoiding any risk of the said pin accidentally slipping out, while the chain is
in use.
In carrying my invention into practical effect, the connecting pin that I em-
ploy is of sufficient length and elliptical or egg-shaped in cross section and
furnished at the apex and at a short distance from each end with a small slot
or recess, so cut or formed as to leave the pin at these parts circular in cross
section, and in this manner the central portion of the pin, corresponding to the
width of the block, (in the case of block chains), is elliptical in cross section,
while for a short distance at each side of this central portion corresponding to
the width of the side or connecting links, it is of circular cross section owing to
the slots formed in its apex, the extremities of the pin being again elliptical or
egg-shaped in cross section similar to the central part.
The blocks and side links to be connected together, are likewise furnished
with elliptical or egg-shaped holes or perforations corresponding to the shape of
the connecting pin, the hole or perforation in the block being designed to receive
the aforesaid central portion of the pin while the holes or perforations in the side
links are formed in the reverse direction to that of the block, and are designed
to allow of the said side or connecting links passing over the elliptical or egg-
shaped extremities of the pin, and into the slots formed therein, and for this
purpose, and to allow of the pin being inserted in position it is necessary to bring
the side or connecting links and the block to such an angle, one to the other, as
to allow of the holes or openings in both coinciding, and upon the side or con-
necting links having entered the aforesaid slots it is only necessary to draw the
links apart in a longitudinal direction to a position such as they occupy when
the chain is in use, to effectually prevent the pin from slipping out, while in
order to remove the pin for disconnecting the chain, it is necessary for the latter
to be sufficiently slack to allow of the side or connecting links and the block fo
be brought to such an angle, one to the other, that the holes or perforations in
both coincide in a similar manner as when inserting the pin.
This new or improved locking pin may be employed for connecting the
extremities of roller chains by means of slight modifications or alterations in the

page_text: parts, but without in any way departing from the nature and principle of the
invention as herein set forth.
Dated this 28th day of January 1899.
COMPLETE SPECIFICATION.
Improvements in Driving Chains for Velocipedes Motor-cars and
the like.
I, ERNEST EDWARD BURGESS, of 38, High Street North, East Ham, Gentleman,
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 improvements in driving chains for velocipedes,
motor-cars and the like, the object being to obviate the danger and expense in-
curred in the use of the ordinary screw pin and nut, employed for connecting
the extremities of such chains together, and to provide, to replace the said screw
pin and nut, a self-locking pin of extremely simple construction, which shall
allow of the parts being readily disengaged when required, at the same time
avoiding any risk of the said pin accidentally slipping out, while the chain is
in use.
In order that my invention may be fully understood, will now proceed to
describe same with reference to the accompanying drawings in which:-
Fig. 1 is a side view of the ends of a chain constructed according to this inven-
tion showing the parts separated.
Fig. 2 shows two views of the locking pin employed, and
Fig. 3 shows the ends of the chain connected together by means of the
improved locking pin.
Fig. 4 showing the position of the said ends for inserting or removing the
locking pin.
Figs. 5 to 9 illustrate the application of this invention to roller chains, and are
hereinafter more fully referred to.
According to this invention, the connecting pin that I employ is elliptical
or egg-shaped in cross section, and furnished at the apex or smallest side and at
a short distance from each end with a slot or recess s, so cut or formed as to leave
the pin, at these parts, circular in cross section, and in this manner, the central
portion of the pin, corresponding to the width of the blocks of the chain, is
elliptical in cross section, while for a short distance upon each side of this central
portion, corresponding to the width of the side or connecting links a, it is circular
in cross section by reason of the slots or recesses s formed in the apex, the extrem-
ities e of the said pin being again elliptical or egg-shaped in cross section corres-
ponding to the central part.
The side or connecting links a and the block b to be connected together, are
likewise furnished with elliptical or egg-shaped holes or perforations, correspond-
ing to the shape of the connecting pin, the hole or perforation b₁ in the block b

page_text: being designed to receive the central portion c of the pin, while the holes or per-
forations in the side or connecting links a are formed in the reverse direction
to that in the block as shown, and are designed to allow of the said side or con-
necting links passing over the elliptical or egg-shaped extremities ee of the
pin p, and into the slots ss formed therein. For this purpose and to allow of
the pin being inserted in position, it is necessary to bring the side or connecting
links a and the block b to such an angle, one to the other, as to cause the ellip-
tical or egg-shaped holes or perforations in both to coincide as shown in Fig. 4,
when the pin p can be passed through into position, and upon the side or con-
necting links entering the aforesaid slots ss in the pin p, it is only necessary
to draw the links apart in a longitudinal direction to a position such as they
occupy when in use, and such as shown in Fig. 3, to prevent the said pin p from
slipping out or being again removed until the chain has been slackened
sufficiently to allow of the links, where the .connection is made, being again.
brought to the required angle as illustrated in Fig. 4.
The holes or perforations a¹ 6 formed in the side or connecting links a and
the block 6 may be formed at any required angle to the horizontal centre line
of the plates and blocks, while the apices of the said elliptical or egg-shaped
holes or perforations may point either in an upward or downward direction as
required.
În applying this invention to "roller" chains or twin roller" chains and as
shown in Figs. 5 to 9 the central portion of the elliptical or egg-shaped pin p
receives a fixed roller or circular block (Fig. 5) which is pierced with a hole or
perforation corresponding to the shape of the pin and upon its outer surface
the roller y (Fig. 6) freely revolves. The central portion of the pin projects
slightly at each side of the fixed roller a, and is designed to enter the correspond-
ingly shaped holes or perforations in the inside plates m', while the holes or
perforations formed in the outside plates m are designed to pass over the extrent-
ities ee of the pin p, and to enter the slots ss formed in the said pin in the
manner hereinbefore described. To insert the locking pin in position, it is neces-
sary to bring the outside plates m and inside plates m², required to be connected
together, to such a position (as shown in Fig. 9), that when brought together
the holes in both pairs of plates will coincide, while upon drawing the links
apart into a horizontal or approximately horizontal position it will be impossible
for the pin to shift out or be removed.
Having now 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/. In driving chains for velocipedes, motor-cars and the like, the employment
of an elliptical or egg-shaped locking pin such as p having slots such as s sub-
stantially as and for the purposes specified.
2/. In driving chains for velocipedes, motor-cars and the like, the formation
of elliptical or egg-shaped holes or perforations such as a' in the side or connect-
ing links a and a correspondingly shaped hole or perforation in the block
formed in opposite directions one to the other as shown (Fig. 1); in combination
with a locking pin such as p, substantially as herein described and shown and
for the purposes specified.
3/. In driving chains for velocipedes, motor-cars, and the like, a connecting
pin having at each end an apex or projecting part designed, when in position, to
overlap the side or connecting links of the chain and retain them in place, sub-
stantially in the manner herein described and shown in the accompanying
drawings.
4/. The application of the invention to roller or twin roller chains and con-
sisting in the employment of a locking pin such as p passing through a fixed
roller such carrying an outer revolving roller y and having the central portion a
projecting sufficiently at each side of the said roller to engage the holes or

page_text: perforations h¹, h¹, of the inside plates or links m³ m', the holes or perforations h h
in the outside plates or links mm passing over the extremities ee of the pin
and entering the slots ss, substantially as herein described and shown with refer-
ence to Figs. 5 to 9 of the accompanying drawings, and for the purposes specified.
Dated this 16th day of February, 1899.
F. G. CASSELL.
(Of Cassell & Co.),
22, Glasshouse Street, Regent Street, London, W.,
Agent for the Applicant.