AN IMPROVED MACHINE OR APPARATUS FOR RIVETTING CHAINS, BELTS, AND OTHER ARTICLES
Year: 1886

page_text: and other Articles.
.
I WILLIAM BIRCH of Milton Iron Works Lower Broughton Manchester in the
County of Lancaster Engineer do hereby declare the nature of my invention for
AN IMPROVED MACHINE OR APPARATUS FOR RIVETTING CHAINS, BELTS, AND OTHER
ARTICLES and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
The object of this invention is to construct an improved machine adapted for
rivetting the hinge pins of metallic or leather links in making metal chains or
leather chain belting or other similar small articles.
Fig. 1 on the drawing is a side view of the machine and Fig. 2 a front view of
the same, partly in section. a, a is the framing of the apparatus supporting in
bearings the main driving shaft b, b. Upon this shaft is keyed a coned, friction
pulley c, c and a driving pulley d, d is mounted loosely thereon so as to be capable
of being moved into or out of contact with the friction pulley c, c by means of a
treadle e, e.
The loose pulley d, d is kept constantly revolving by means of
a driving strap and whenever it is pressed into contact with the friction pulley c, c
by means of the treadle it causes the driving shaft b, b to revolve also.
Upon this driving shaft is also keyed a pulley f. f driving by means of a strap
and a similar, pulley g g the cam shaft g, g.
This shaft is provided with a pair of cams h, h facing each other and made in
the form of crown ratchet wheels that is, with gradual rises and sudden drops,
acting against pegs or rollers i, i attached to two springs k, k, which keep the pegs
or rollers i, i constantly against the faces of the cams h, h.
The upper ends of these springs k, k are notched and each embrace a neck or
recess formed at or near the end of a sliding punch or rivetting tool l, l; the two
punches being carried in brackets m, m fixed on the table n, n of the machine; so
that as the cam-shaft g', g' revolves the cams h, h alternately separate or withdraw
the punches, and allow the springs k, k to force them rapidly together again.
The action of the springs k, k is also further accelerated by the coiled springs k³, k¹
at their upper ends,
At the same time that the punches 1, are thus caused to move rapidly to and fro
endwise, they are also caused to revolve by the following means.

page_text: Upon the driving shaft b, b is keyed a pulley o, o driving (by means of an endless
strap and a similar pulley) a shaft p, p which is provided with two grooves.
Round these grooves pass two endless elastic bands r, r which also pass round
grooves in the two punches or rivetting tools 1, 1 so that at the same time that they
move rapidly to and fro endwise they revolve on their axes.
The form of these punches or rivetting tools l, is shown clearly by the detached
views Fig. 3 (which are drawn full size).
I make the ends convex and form a concave groove 8, 8 across the convex part,
which as they revolve and reciprocate rapidly forms a perfect round head to the
hinge pin or rivet which is placed between them.
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
First, the general construction and arrangement of the various parts forming a
rivetting machine for chains and other small articles substantially as hereinbefore
described and illustrated by the drawings annexed.
Secondly I claim the combination, with the punches or rivetting tools of
rivetting machines, of cams for forcing the punches asunder and springs for
bringing them rapidly together again, so that the rivetting is performed by the
springs and not by the cams.
Thirdly, imparting a combined oscillating and revolving motion to the punches
simultaneously substantially as and for the purposes described and
Fourthly I claim the concavo-convex form of the punches or rivetting tools as
shown and described with reference to Fig. 3 on the drawings annexed.
Dated this 11th dow of Morah 10s6