Improvements in Chains for Driving Purposes, and in the Means of Rivetting the Links and Parts thereof together.
Year: 1897

page_text: Date of Application, 20th Jan., 1897
Complete Specification Left, 20th Nov., 1897-Accepted, 24th Dec., 1897
Improvements in Chains for Driving Purposes, and in the Means of
Rivetting the Links and Parts thereof together.
I, HARRY MORRISON 36 Buckingham Road Stratford Engineer. do hereby declare
the nature of this invention to be as follows:-
This invention consists in improvements in chains for driving purposes and in the
means of rivetting the links and parts thereof together, and consists of forming a
projecting burr or shoulder upon the links said burr or shoulder being formed upon
one side of the apertures or holes in said links when the apertures or holes are being
punched or formed, and this is done by employing a countersunk die and punch so
arranged as to form this burr or projection when punching or forming the holes or
apertures in the links The ends of the pivots or wearing surfaces are tapered or
conical having the larger diameter towards the outer ends of the pivots or wearing
surface. The links are then placed so that the ends of the pivots pass through the
apertures; the burr or projection coming into contact with a shoulder upon said
pivot and by exerting pressure the burr or projection is flattened so as to bear upon
the conical surface of the pivot thus maintaining the links in position.
It will be seen that by this means the hammering of the pivots in order to hold
the links in position is unnecessary and thus the pivots & links may be used with
a more even or equal degree of hardness.
.
Improvements in Chains for Driving Purposes, and in the Means of
Rivetting the Links and Parts thereof together.
I, HARRY MOKRISON 36 Buckingham Road Stratford, 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 consists in improvements in chains for driving purposes and in the
means of rivetting the links and parts thereof together, and consists of forming a
projecting burr or shoulder upon the links, said burr or shoulder being formed upon
one side of the apertures or holes in said links when the apertures or holes are being
punched or formed, and this is done by employing a counter-sunk die and punch so
arranged as to form this burr or projection when punching or forming the apertures
in the links. The ends of the pivots are tapered or conical, having the larger
diameter towards the outer ends of the pivots. The links are then placed so that the
ends of the pivots pass through the apertures, the burrs or projections coming into

page_text: contact with a shoulder upon said pivots and by exerting pressure the burr or pro-
jection is flattened so as to bear upon the conical surface of the pivot or a recess or
recesses, thus maintaining the links in position.
In order that my invention may be fully understood, I will now refer to the
annexed drawings, in which :-
..
Figure 1. is a sectional plan of a chain constructed according to my invention.
Figure 2. is a sectional plan shewing links in course of being secured to the pivots.
Figure 3. view of pivot pin.
Figure 4. view of modified form of pivot pin.
Figure 5. plan view of link detached.
Figure 6. side elevation of same.
Referring to figures 1 and 2, a are the pivot pins having tapered ends 6 and which
pass through the connecting pieces c. d are side links, the apertures in which are
provided with a burr or shoulder e. This burr or shoulder may be formed in any
convenient manner such as by the operation of punching the apertures f in the
links d. When these side links d are placed in the position shewn in figure 2 upon
the pivot pins and pressure is exerted by means of any convenient form of press, the
jaws of which are represented by the letters g. The burr or shoulder is flattened
against the shoulder h of the pivot pin a and is thus caused to engage around the
tapered ends b and so secure the links and pivot together. By this construction and
arrangement of link and pivot the necessity for hammering the ends of the pivots in
order to rivet them to the links is dispensed with, and the great objection to this
hammering, as in the present means of rivetting, is that if the pins are hard steel
they are liable to crack or fracture at their ends; whereas according to my invention
the pins may be of the hardest steel and of equal temper throughout as the burr
upon the links enables the rivetting to be carried out by means of pressure instead of
hammering upon the ends of the pivots. In figure 4 a modified shape of pivot end
is shewn in which the taper may be reduced or altogether dispensed with, the end b¹
being merely recessed or undercut at 62 and into which the burr or projection upon
the links is forced upon the exertion of the required pressure.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
1. The combined construction and arrangement of a chain substantially as described
and illustrated and for the purpose set forth.
2. In chains of the class herein described: the employment of burrs or shoulders
surrounding apertures upon the links to be rivetted; said burrs or shoulders being
caused to engage around the tapered ends or a recess in the ends of the pivot pins so
that the application of pressure causes the links and pivot pins to be secured.
Dated this 20th day of November 1897.