Improvements in Rivetting Machines.
Year: 1891

page_text: Date of Application, 1st Apr., 1891
Complete Specification Left, 28th Dec., 1891-Accepted, 5th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in Rivetting Machines.
I, CAMPBELL PECK HIGGINS of Kilbowie, Dumbartonshire, Engineer, do
hereby declare the nature of this invention to be as follows:-
In the art of joining rivetted structures by hydraulic rivetting machines as
ordinarily practised pressure is applied to the ends of the rivets by a snap adapted
to form a rounded or other shaped head on the rivet, and a more or less tight
joint is obtained by simply staying up the end of the rivet.
The object of my invention is to ensure tight and efficient jointing and at the
same time produce a better finish of the rivet heads by imparting in addition to
the usual end pressure or staving action a motion of rotation or partial rotation
to the rivetting snap whereby the rivetting is effected more rapidly or at reduced
cost.
The motion of rotation or partial rotation of the snap may be produced in
various ways
but in a hydraulic rivetting machine of any of the well known forms
I employ small hydraulic rams situated transversely of the main ram to act
directly or through links upon snugs or shoulders or other enlargements on the
snap so as to turn or partially turn it or the plunger of the rivetting ram on
its axis.
In one arrangement I fix a ram on each side of the snap the one ram being of
greater diameter than the other and upon admitting water under pressure the snap
is turned in one direction whilst on relieving the pressure it is turned in the opposite
direction.
In the operation of the machine the end pressure of the main ram is first
applied and whilst such pressure is maintained the turning movement is applied
to the snap by operating suitable levers to admit water to the transverse ram
cylinders.
Dated this Thirty-first, day of March 1891.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Rivetting Machines.
I, CAMPBELL PECK HIGGINS, of Kilbowie, Dumbartonshire, 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:--
In the art of joining rivetted structures by bydraulic rivetting machines as
ordinarily practised pressure is applied to the ends of the rivets by a snap adapted
to form a rounded or other shaped head on the rivet and a more or less tight joint
is obtained by simply staving up the end of the rivet.
The object of my invention is to ensure tight and efficient jointing and at the
same time produce a better finish of the rivet heads by imparting in addition to
the usual end pressure or staving action a motion of rotation or partial rotation
to the rivetting snap whereby the rivetting is effected more rapidly or at reduced
cost.
The motion of rotation or partial rotation of the snap may be produced in
various ways but in a hydraulic rivetting machine of any of the well-known forms
I employ small hydraulic rams situated transversely of the main ram to act

page_text: directly or through links upon snugs or shoulders or other enlargements on the
snap so as to turn or partially turn it or the plunger of the rivetting ram on
its axis.
.
In the accompanying drawings which illustrate my invention
Figure 1 is a transverse vertical section, Figure 2 a longitudinal vertical section
and Figure 3 an end elevation of the ram or plunger of a hydraulic rivetting
machine Figure 4 is a plan, Figure 5 a side elevation and Figure 6 an end
elevation of the same.
In the arrangement I fix a ram A A¹ on each side of the snap or snap carrier B
the one ram A being of greater diameter than the other A' and upon admitting
water under pressure through flexible pipes a a to the cylinders C C¹ of these
rams the snap B is turned in one direction whilst on relieving the pressure it is
turned in the opposite direction.
In the operation of the machine the end pressure of the main ram D is first
applied and whilst such pressure is maintained the turning movement is applied to
the snap B by operating suitable levers to admit water to the transverse ram
cylinders C C².
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a rivetting machine the combination with the snap or snap carrier with
means for rotating or partially rotating it whilst pressure is applied to the rivet
head substantially as described.
2. In a rivetting machine the arrangement of hydraulic rams for partially
rotating the snap or snap carrier substantially as described.
Dated this Twenty-fourth day of December 1891.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.