Improvements in Hydraulic Rivetting Machines.
Year: 1894

page_text: Date of Application, 14th Sept., 1894-Accepted, 3rd Nov., 1894
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COMPLETE SPECIFICATION.
Improvements in Hydraulic Rivetting Machines.
I, HENRY BERRY, of Croydon Works, Hunslet, Leeds, in the County of York,
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 relates to improvements in hydraulic rivetting machines, my
object being to so construct such machines as to enable boiler flue seams and like
work to be readily and efficiently rivetted when suspended in a vertical or other
position.
In order that my invention and the method of carrying the same into effect may
be the more readily understood I append hereunto one sheet of explanatory
drawings, on which
Figure 1 is a side elevation (part in section) and Figure 2 an end elevation of
my improved rivetting machine."
The same reference letters in each figure indicate the same parts.
At the upper end of a suitable cast iron or other frame or standard such as A,
I mount or pivot on the trunnion B the arms C and D. One end of the upper
arm C is formed as, or has attached thereto, the hydraulic cylinder C¹, having the
ram E working within it. The outer end of the ram E has a convex surface to
work or press against the concave surface of the adjacent end of the lower
arın D. The opposite ends of each arm carry the rivetter snaps or dies F and G
respectively.
Upon the frame or standard A, I provide stop pieces H and J, for limiting, in
conjunction with the tappet or lug K, the movement of the upper arm C, the
tappet K being formed with, or rigidly attached to the arm C. A lug L is in
like manner provided upon the lower arm D against which presses the ram M of
the auxiliary constant pressure cylinder N for the purposes hereinafter described.
The action of my improved rivetting machine is as follows:-
When the main ram E is at the upper or inner end of its stroke, the jaws formed
by the snap end of the arms C and D are fully open, and the joint or seam of the
boiler flue, or other work to be rivetted, may be admitted between the snaps F
and G as illustrated at Figure 1. On the admission of hydraulic pressure to the
cylinder C, the ram E is forced against the lower arm D, but the resistance
offered by the ram M of the constant pressure cylinder N, by its pressure against
the lug L, prevents the full movement of the lower arm D until the snap F of the
upper arm C has been closed onto the head of the rivet and its further movement
prevented by the tappet or lug K coming into contact with the stop piece H.
The rivet being thus securely held in position, the main ram E then moves forward
under the influence of the pressure in the cylinder (and overcoming the resistance
of the ram M of the constant pressure cylinder N, causes the lower arm D with its
rivetting snap G to advance for forming and completing the rivet head.
On release of the pressure from the cylinder C, the ram M of the constant
pressure cylinder N forces back the lower arm D and thus causes the withdrawal
of the snap G. The upper end C is returned and the snap F withdrawn by the
weight of the cylinder C, the stop piece J limiting the movement to the required
distance. In this manner the jaws at the snap end of the arms C and D are
automatically opened for the reception of the next rivet.
I construct my improved rivetting machine to work with varying degrees of
pressure and employ any well known and suitable valves and connections for
controlling the hydraulic supply.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In hydraulic rivetting machinery the method of retarding the movement of
one snap or die during the movement of the other, by means of an auxiliary
hydraulic cylinder and ram, substantially as and for the purposes hereinbefore
described and as illustrated in the accompanying drawings.
2. In hydraulic rivetting machinery, the method of withdrawing the rivetting
snap or die by means of an auxiliary hydraulic cylinder and ram substantially as
and for the purposes hereinbefore described and as illustrated in the accompanying
drawings.
3. In hydraulic rivetting machinery the combination of the pivoted or hinged
arms having the main hydraulic cylinder and ram at one end and the rivetting
snaps or dies at the other end, with an auxiliary hydraulic cylinder and ram formed
upon or attached to the standard or base of the machine, substantially as and
for the purposes hereinbefore described and as illustrated in the accompanying
drawings.
Dated this 13th day of Santambon 1001
MARKS & CLERK;
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.