Improved Driving Chain.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improved Driving Chain.
I, DENIS PARRY of 20, Milton Road Herne Hill London S.E. do hereby declare the
nature of this invention to be as follows:-
The Chain to which this invention relates is formed of two Kidney Section Blocks
each of which is one half the width of the Chain. These two Blocks are rivetted
together as hereafter described and thereby form one Block or Link which are
connected by means of an ordinary flat Link. Each section of the above mentioned
Block or Link is constructed in the following manner, viz. :-On the inner surface
and at each end of the Kidney Section Block, circular recesses or grooves are
machined so that a pivot is formed. These circular recesses or grooves are of
sufficient size to admit of the connecting Link working on the Pivots formed on each
Section Block. It will be observed that in machining the recesses or grooves above
referred to, the centre part of each Section Block is left untouched, and through this
portion a hole is drilled for rivetting the two Sections together so as to form one
Block or Link as already stated.
By constructing these Sections in the manner now described, the Pivots form an
integral part of the solid Metal, cach pivot extending one-half the thickness of the
connecting Link. The rivetting of the two Sections together brings these pivots into
contact, and the connecting flat Links being previously attached, work on these
two Pivots at either end. By means of these Blocks or Links formed as already
described and the connecting flat Links also above described, a chain of any length
desired is formed.
I, DENIS PARRY, formerly of 20 Milton Road, but now of 38 Spencer Road, both in
Herne Hill in the County of Surrey, 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:---
My invention relates to an improved driving chain adapted for cycles, self
propelled vehicles, and various machines (including the driving or cutting chain of
what are known as chain mortising machines for wood working) and for many other

page_text: Fig. 3 is a front elevation of Fig. 2.
Fig. 4 is a side elevation of the solid links of Fig. 2.
Fig. 5 is a cross section of same.
Fig. 6 is a side elevation of one half of the divided links of Fig. 2.
Fig. 7 is a section through same.
Fig. 8 is a side elevation shewing a modified form of solid link.
Fig. 9 is a cross section of same.
Fig. 10 is a front elevation shewing the solid link of Figs. 8 and 9 and a modified
form of divided link connected together.
Fig. 11 is a side elevation of one half of the divided link of Fig. 10.
Fig. 12 is a cross section through same.
The chain illustrated in Fig. 1 is composed of a divided link a and a solid link b
these being repeated according to the number of links required. The divided links
are of kidney shaped section as shown, the parts being preferably cut from bars of
kidney section steel or other desired metal or material.
Where it is desired however to employ a chain which is reversible the kidney
shaped links are preferably replaced by straight divided links a such as shewn in
Figs. 2 to 7 a description of which will be otherwise identical with a description of
Fig. 1.
In producing a divided link c such as shewn in these figures and particularly in
Figs. 6 and 7 I form them from pieces or sections of a bar of metal (of the desired
shape) and machine out parts at each end of same so as to leave large studs c which
are thus formed out of the solid metal.
In the form of link shewn in these figures the method of production is as follows:-
Each part or half of the link a has formed in it at each end recesses or gaps d such
recesses being machined out or otherwise produced so that a stud or pivot pin c is
formed, the recesses or gaps being of sufficient size to admit of one half or part of the
links such as a working on the studs or pivots.
In machining or producing these studs or pivots the centre part of each half or part
of the link is left untouched and through this portion a hole e is drilled or formed
for a pin or rivet. which is subsequently passed through two of these parts and rivets
or secures them together.
It will be understood that when the two halves or parts are placed together with a
link such as b between, the stud or pivot pins c of each will abut and form what is
practically a solid pin on which the link b will pivot and that the main parts forming
the body of the link also abut to form a solid mass of metal.
To open the chain it is only necessary to drive out the pin occupying the central
hole e when the parts of the link a may be separated.
In Figs. 8 to 12 is shewn a modification of my invention in which the solid link b
has studs c¹ formed integral therewith such studs being preferably produced by
machining or milling out or removing the metal of the link so as to leave same
projecting from a lower plane or surface. In this way a large bearing stud may be
formed similar to the large bearing studs c on the divided link previously described
and like them there need be little metal left around same, enough to form a shoulder
being all that is required.
The divided link a must be modified to take these pins c' and it is therefore formed
as shown in Figs. 10, 11, 12 by milling out or forming first the recesses or gaps d
and then sinking holes f to receive the studs c¹ which holes do not pass entirely
through the part. The parts are connected by a pin or rivet driven through the
hole e as in the previous case. It will be seen that the recesses or gaps & form spaces
to receive the solid link between the parts as in the other form."
It will be understood that a driving or sprocket wheel intended to engage with
this chain must have a pair of teeth or sprockets side by side so as to embrace the
solid link bor must be formed with a suitable recess to receive said solid link as a

page_text: wheel having single sprockets arranged in the same plane is not suitable for driving
same.
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. A chain link composed of parts each part having a stud at either end formed
out of the metal of the part and projecting inwardly, recesses or gaps around same
and a hole for a pin or rivet the parts when put together being so formed that the
studs of one part abiit against the studs of the other as do also the main parts forming
the body portion substantially as and for the purpose described.
2. The constructions of divided link substantially as described and illustrated in
Figs. 1, 2, 3, 6 and 7 of the drawings.
3. The construction of divided link substantially as described and illustrated in
Figs. 10, 11, and 12 of the drawings.
1003