An Improved Hydraulic Tool for Cutting Off Rivet Heads or the like purposes.
Year: 1893

page_text: Date of Application, 11th Mar., 1893
Complete Specification Left, 11th Dec., 1893-Accepted, 13th Jan., 1894
PROVISIONAL SPECIFICATION.
An Improved Hydraulic Tool for Cutting Off Rivet Heads or the
like purposes.
We, THOMAS BLENKINSOPP, of 20 Clayton Park Road, in the City and County
of Newcastle-upon-Tyne, and JOHN WILLIAM PARKER of 24 Hugh Street,
Wallsend, in the County of Northumberland, Ship Platers, do hereby declare the
nature of this invention to be as follows:-
Our invention is intended to supersede the present system of cutting off rivet
heads by hammer and chisel which, with the very large rivets now used for high
pressure boilers, ships and other structures of thick plates, is laborious, slow and
expensive.
We propose to use a portable tool with hydraulic pressure, which in some cases
may be available from existing plant in the yard or shop where the rivet heads are
to be cut off for re-rivetting or for breaking up purposes.
As it will generally be necessary to depend upon the pressure available within
the tool itself we will describe our invention in that form.
The portable tool will consist of a chisel shaped cutter mounted in a ram working
out of a cylinder and packed with cup leathers at its inner end. In one casting
with the cylinder, or preferably attached to it is a small reservoir for oil or water
in which is a pump worked by a lever outside and communicating with the ram
cylinder by a non-return valve to retain the pressure at each stroke of the pump
piston or plunger. The ram returns by the action of a spring or other mechanical
device the fluid behind it escaping into the reservoir through a small channel opened
by a valve by a screw outside which is closed when the working stroke is being
made. The fulcrum for the operation of cutting off the heads is obtained by
brackets, which may be cast upon the ram cylinder, with ends so shaped as to grasp
the edge of the plate or of the "butt-strap an adjacent rivet head or other
projection beyond the chisel shaped cutter, or bars with hooked ends may be
adopted the opposite ends being attached to the ram cylinder so as to be adjustable
or in some cases a fulcrum may be obtained at the rear end of the machine. The
operation of the tool is as follows:-
"
The chisel shaped cutter being fixed in the outer end of the ram the tool is
placed in position with the edge of the cutter against the lower edge of the rivet
head the fulcrum being obtained in any of the methods above named the tool being
in an inclined position to give the cutter a tendency to undercut the rivet head the
cutter being shaped so as to assist that object. Pressure being now applied, either
direct from the accumulator or by working the pump, the cutter shears off the rivet
bead either completely through the diameter of the rivet or until the head flies off.
The tool will be provided with handles for lifting it or slinging it from blocks as
may be necessary and the cutter, when required to be sharpened, is readily discon-
nected from the ram.
Tin 19th Jan of March 1902

page_text: COMPLETE SPECIFICATION.
An Improved Hydraulic Tool for Cutting Off Rivet Heads or the
like purposes.
We, THOMAS BLENKINSOPP, of 20 Clayton Park Road, in the City and
County of Newcastle-upon-Tyne, and JOHN WILLIAM PARKER of 24 Hugh
Street, Wallsend, in the County of Northumberland, Ship Platers, 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:-
Our invention is intended to supersede the present system of cutting off rivet
heads by hammer and chisel which, with the very large rivets now used for high
pressure boilers, ships, and other structures of thick plates, is laborious, slow, and
expensive.
We propose to use a portable tool with hydraulic pressure which in some cases
may be available from existing plant in the yard or shop where the rivet heads are
to be cut off for re-rivetting or for breaking up purposes.i
As it will generally be necessary to depend upon the pressure available within
the tool itself we will describe our invention in that form.
The portable tool will consist of a chisel shaped cutter mounted in a ram working
out of a cylinder and packed with cup leathers at its inner end. In one casting
with the cylinder, or preferably attached to it, is a small reservoir for oil or water
in which is a pump worked by a lever outside and communicating with the ram
cylinder by a non-return valve to retain the pressure at each stroke of the pump
piston or plunger. The ram returns by the action of a spring or other mechanical
device the fluid behind it escaping into the reservoir through a small channel
opened by a valve (by a screw outside) which is closed when the working stroke is
being made. The fulcrum for the operation of cutting off the heads is obtained by
brackets, which may be cast upon the ram cylinder, with ends so shaped as to grasp
the edge of the plate or of the "butt-strap" an adjacent rivet head or other
projection beyond the chisel shaped cutter, or bars with hooked ends may be
adopted, the opposite ends being attached to the ram cylinder so as to be
adjustable, or in some cases a fulcrum may be obtained at the rear end of the
machine.
The operation of the tool is as follows
The chisel shaped cutter being fixed in the outer end of the ram the tool is placed
in position with the edge of the cutter against the lower edge of the rivet head the
fulcrum being obtained in any of the methods above named the tool being in an
inclined position to give the cutter a tendency to under cut the rivet head the cutter
being shaped so as to assist that object. Pressure being now applied, either direct
from the accumulator or by working the pump, the cutter shears off the rivet head
either completely through the diameter of the rivet or until the head flies off.
The tool will be provided with handles for lifting it or slinging it from blocks as
may be necessary and the cutter, when required to be sharpened, is readily
disconnected from the ram.
DESCRIPTION OF DRAWINGS.
The accompanying drawings illustrate our invention in two forms for ordinary
work but the tool may be made with special modifications for special cases of its
application to rivet heads in difficult places. Only those parts are shewn which
shew the new features, other parts such as the hydraulic cylinder and its adjuncts
being merely indicated and the application of power either direct from an
accumulator or by a hand pump will depend upon the circumstances under which it

page_text: is to be used and when a hand pump is required it may be attached to the cylinder
in a reservoir chamber either at the back or the side or top of the cylinder and may
be horizontal or vertical or may be entirely separate from the tool and connected
to the cylinder by flexible tubing.
Fig. 1 is a sectional elevation, Fig. 2 a plan on top, and Fig. 3 a cross section
through the line a-b of Fig. 1, each shewing a guide for the cutting tool.
Fig. 4 is a partial sectional view shewing the cutting tool as a chisel inserted
into the end of the ram and without any other guide. A guide will be necessary
in such work as when the cutting edge of the tool projects beyond an imaginary
line drawn through the inclined axis of the cylinder and produced to the point
where the fulcrum is gripped or otherwise the whole tool has a-tendency to rise
from the working surface unless kept down but in boiler work with thick plates
this tendency does not exist and the guide may be removed and the chisel tool will
operate direct.
Referring to Figs. 1, 2, and 3, A is the cylinder having cast upon it the open
frames B B united at their outer ends into a solid block C in a groove in which is
fitted an inclined chisel pointed tool, working adjustably in a slot and secured by a
nut on top for the purpose of gripping and it may be in assisting in cutting off a
rivet head, whilst the cutting off tool is operating upon the same, or an adjacent
rivet head, and this adjustable chisel pointed tool we propose to use also to
grip the edge of a "landing plate or "butt-strap
as a fulcrum as well as for
cutting rivets.
"
"
The ram H is
The cutting off tool D is inserted in a square hole in the guide bracket E fixed
by a bolt into a flanged block F which slides on guides G on the sides of frames B B.
This guide bracket E is connected with the outer end of the ram H of the cylinder A
by a self adjustable sliding block S angled to suit the inclination of the ram which
fits into a cavity in the ram and is secured thereon by a set bolt K.
reduced in diameter where it passes through the keep piece L and between the
latter and a shoulder on the ram a strong coiled spring M is inserted to bring back
the cutting off tool D after it has operated, the pressure having been relieved by
opening the escape valve on the cylinder A.
The guide bracket E carrying the cutting tool D and secured to the flange
block sliding in the guides & prevents the whole tool raising itself off the
working surface when a rivet head is being cut off.
Referring to Fig. 4 the guide bracket E, flanged block F, working on the
guides G are dispensed with, the cutting off tool D being inserted direct into
the cavity in outer end of the ram in which it fits with a certain amount of ball
and socket like adjustment. When the tool is working in an inverted or partly
inverted position the chisel tool is kept in working position as well as guided at
each side by a spring device attached to a fork which is readily removed when the
guided cutting tool is required.
The tool in the forms shewu will execute any ordinary cutting off work but there
are some special cases in which to enable it to operate on rivets close up to some
obstruction the tool will be made without the bracket frames B B so that the
cutting chisel tool will be the furthest projecting point and in this form the fulcrum
will be obtained from some adjacent abutment at the back of the hydraulic cylinder
as in ship work " frame or "floor."
"
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1st. The improved tool for cutting off rivet heads or the like comprising a
hydraulic cylinder inclined at an angle to the horizontal line mounted on a frame
with means for gripping a rivet plate edge or other abutment, as a fulcrum; a
cutting chisel tool, fitted on a bracket, working in guides so as to keep the tool
from a tendency to rise when operating, said guided bracket being adjustably
connected to the ram to allow for its inclined movement in the cylinder constructed

page_text: and operating substantially as described and shewn by Figs. 1, 2, and 3 of the
.drawings.
2nd. In hydraulic tools for cutting off rivet heads the method of guiding the
cutter in the required direction and preventing the tendency of the tool to rise
from the working surface consisting in mounting the cutter in a guide bracket
working on adjustable guide bars and the method of attaching the cutter to the
ram by a self adjusting sliding block to allow for the inclined line of motion of the
ram combined with the application of an inclined chisel shaped tool adjustable
virtually to act at the front end of the machine either as an auxiliary cutter and
fulcrum grip combined or as the latter only, constructed and operating substantially
.as described and with the objects hereinbefore stated.
3rd. The improved tool in a modified form in which the cutting chisel is attached
direct to the end of the ram by a self adjusting "ball and socket" like joint so as
to cut the rivet head at an angle the girder bracket and guide bars being dispensed
with, constructed and operating as described and in part shewn by Fig. 4 with the
objects herein before stated.
Dated this 11th dox of December 1802
T. J. DANSON, F. Inst. P.A.,
Chartered Patent Agent, Agent for Applicants.