Improvements in and relating to Rivetting Toois.
Year: 1899

page_text: Date of Application, 2nd Mar., 1899-Accepted, 6th May, 1899.
COMPLETE SPECIFICATION.
Improvements in and relating to Rivetting Toois.
I, LAWRENCE ZAMBONI, of No. 3, Prospect Park West, in the City of New
York, Borough of Brooklyn, and State of New York, United States of America,
Machinist, do hereby declare the nature of this invention and in what manner
the sanie is to be performed, to be particularly described and ascertained in and
by the following statement:
=
This invention relates particularly to improvements in riveting tools designed
for use in connection with the riveting together of the links of bicycle or similar
sprocket-chains and has for its objects:-
First, to provide means for correctly assembling the links of the chain and
their uniting rivets, in such manner that the opposite ends of the rivets will
project at equal distances beyond the lateral or side links, so that the rivet-heads,
when completed, will be of the same size and finish.
Second, to provide means for making completed rivet-heads which shall be
symmetrical in size and finish.
The invention will be fully understood by referring to the accompanying
drawings, in which,
Figure 1 illustrates the same in vertical sectional view on the line y
Figure 2, and as seen looking at that figure from the left toward the right hand
side of the drawings, in the direction of the tailless arrows, parts of the tool
and a sprocket-chain being shown in elevation.
Figure 2 is a side elevational view illustrating the invention as seen looking
at Figure 1 from the right toward the left hand side of the drawings, in the
direction of the tailed arrows, and illustrating also said tool as held in a vice.
Figure is a transverse sectional view taken on the line - Figure 1 and
as seen looking at that figure of the drawings from the bottom toward the
top, in the direction of the tailless arrows.
Referring to the drawings in detail, A represents the supporting frame of the
tool, constructed preferably of cast metal and of the conformation shown, with
a downwardly extending rectangular section G designed for the purpose of
enabling a complete tool to be held in a machinists vice VV.
BB represent cylindrical shaped steel anvils, set in the lower lateral extension
of the frame A, the upper end of the anvil B being hollowed out so as to
constitute a seat for the completed end of a rivet, while the upper end of the
anvil B is hollowed out-in cylindrical and cone form as shown-so as to
constitute a guide-way for the lower end of the rivet when assembling the parts
of a sprocket-chain, one of said sprocket-chains being shown in position to be
rivetted, in full and dotted lines: R being the rivets, LL the side links;
LL the intermediate links and the heads of a completed rivet.
B represents a reciprocating assembling device, made preferably of a short
length of steel and having a guiding and spacing opening d in its lower end,
of the same conformation and diameter as the end of the unfinished rivet, said
opening being the counter part, of the corresponding guiding and spacing
opening in the upper end of the anvil B.

page_text: B represents a reciprocating rivetting device provided at its lower end with a
cup-shaped concavity and radially disposed teeth tttt, the function of which
will be described in connection with the description of the mode of operation.
The parts B and B are each provided with shoulders EE integral therewith
and heads HH and are adapted to slide longitudinally in openings drilled
side by side in the frame A; DD' being seats for the lower ends of springs s sl
adapted to bear, when in position, against the undersurfaces of the shoulders E E¹.
W is 'a ratchet-wheel secured to the reciprocating riveting device B, and FFI
are collars swaged upon the lower ends of the reciprocating parts BB, the
collar F holding the ratchet-wheel W in place and the arrangement being such,
when said parts are in position, that the springs s s¹ will normally tend to hold
the reciprocating parts BB in their extreme upper positions, as clearly illustrated
in Figure of the drawings.
S is a steel spring pawl having an inclined surface at its lower end adapted
to engage in the teeth of the ratchet-wheel W, when the latter is in its lower
position, said spring pawl being secured to the side of the frame A by a screw S1
and a spiral spring 2, in such manner that it will yieldingly act, as will be
described later on.
The operation of the improved tool is as follows:--
.
A sprocket-chain, as illustrated in Figure 1, having the parts thereof roughly
assembled by uniting the side links LL and intermediate links L'L' with the
unfinished rivets R, is placed in position in the tool as shown, and each succeeding
unfinished rivet is placed with its lower end in the upper end of the anvil B³,
after which the reciprocating assembling device B₁ is struck a sharp blow with
a hammer upon the head H¹, thereby causing it to descend with such force that
the lower cylindrical cone-shaped end thereof will effectually compress
or unite the side links and the intermediate links and accurately
assemble the parts, in such manner that the opposite ends of the rivets will
be in such position that they are of equal length. The chain is now moved
forward and the lower end of the rivet placed in the upper end of the anvil B²,
after which the hammer is applied successively to the head H of the recipro-
cating device B causing it to descend with such force upon the head of the rivet
that the cup-shaped concavity will tend to give the rivet head the conformation
shown. As the reciprocating device descends, that ratchet-tooth of the ratchet-
wheel W which is directly under the spring S will ride out from under said spring,
so that as the reciprocating device ascends-under the action of the spring
this ratchet-tooth will come into mechanical contact with the inclined face of
said spring and will cause the ratchet-wheel W, and hence the rivetting device,
to make a fractional part of a revolution in the direction of the arrow, see
Figure 3. On the next succeeding descent of the reciprocating device, there-
fore, the teeth at the lower end of the rivetting tool will be caused to assume a
new position with relation to the rivet-head.
It will be appreciated, therefore, that by reason of the successive change of
positions of the teeth tt of the rivetting device there will be given a rivetting
tendency and, at the same time, the concavity or cup-shaped portion c will tend
to give to it a round conformation. After the rivet-head is thus completed on.
one side of the chain, it, the chain is turned over and the rivet-head upon the
other side is completed in the same manner.
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 tool for assembling sprocket chains consisting of a reciprocating part and
an anvil, both held in a supporting frame and each having a guiding and spacing
opening adapted to assemble the parts in such manner that the rivets extend
on opposite sides for equal distances, in combination with a spiral spring

page_text: operatively connecting the reciprocating part to the frame in such manner as
to hold it in its upper or normal position, substantially as described.
2. An assembling device for sprocket-chains, consisting of a reciprocating part
provided with means for assembling the links and rivets thereof so that equal
lengths of the rivets are exposed on opposite sides of the chain and the parts
firmly held together in combination with a reciprocating riveting part provided
with teeth for effecting a riveting action on the rivets and means for giving
to said part successive changes of position, said assembling device and riveting
part being each provided with a spiral spring adapted to hold it normally in its
upper position substantially as described.
3. A riveting tool consisting of a reciprocating part provided at one end with
a concavity and teeth for giving to the link a rounded head, said reciprocating
part being supported in a frame and provided with means, such as springs, for
holding it in its upper position, in combination with means for successively
rotating said teeth a fractional part of a revolution after each blow, substantially
as described.
Datad this 2nd day of Mar 1900
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.