Improvements in Bolt and Rod Cutters.
Year: 1892

page_text: Date of Application, 22nd Aug., 1892
Complete Specification Left, 20th May, 1893-Accepted, 22nd Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in Bolt and Rod Cutters.
I WILLIAM MARCH of 69 Adelaide Road, South Hampstead in the County of
London Mechanical Engineer do hereby declare the nature of this invention to be
as follows:-
:-
This invention resembles a pair of shears and consists of two flat steel jaws
sharpened at their inner and opposite edges which, when brought together, cut
metal bolts, rods or other such like hard and tough material.
Each jaw is pivoted near its cutting end and works between a top & bottom plate,
through which, as well as through the jaws, these pivots pass. At the other and
prolonged end of these jaws there are teeth which gear into those of small pieces of
steel of the same thickness as the jaws and each of which is also pivoted by a bolt
which passes through it and the aforesaid plates.
These pieces are moved to & fro by opening and closing two long handles to which
they are fastened & thus operate on the jaws.
Each handle has a long female joint which receives the aforesaid small steel piece
as well as the aforesaid top & bottom plates.
The small steel piece is prolonged, & has at its further end another bolt hole, &
as there are two bolt holes in the female joint of the handle, about an inch apart
& having their centre line at right angles to that of the length of the handle, it
follows that the hole in the prolonged end of the steel piece can be placed in a line
with either of the two holes in the female joint and secured there by a bolt. The
object of this is to bring the cutting edges of the jaws nearer together when
separated by wear.
The shearing or cropping power of this tool is obtained by the leverage of the
jaws themselves plus that of the small steel pieces combined with that of the handles
of which they form part when the prolonged end of the former is secured to the
latter.
By the aid of a set screw which enters at the inner edge of each handle, close
under the female joint, accurate adjustment of the space between the cutting edges
of the jaws can be obtained, as the two set screw heads come in contact & regulate
the nearness to which the two handles can be brought together.
Dated this 22nd day of August 1892.
WILLIAM MARCH.
COMPLETE SPECIFICATION.
Improvements in Bolt and Rod Cutters.
I WILLIAM MARCH of 69 Adelaide Road South Hampstead London Mechanical
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 :-
My said invention has for its object the cutting of metal bolts, rods & other such
like hard materials.
In order that my invention may be clearly nnderstood I have annexed hereunto
a drawing & have marked the same with letters of reference corresponding with
those in the following description.
The invention resembles a pair of shears & consists as shown in Fig. 1. of two
flat steel cutters A both of which are sharpened at their inner edges & are pivoted
by set screws which pass through them & through a pair of top & bottom plates B.
| Price 8d.1

page_text: At the opposite ends of these cutters there are teeth which gear into those of small
toothed adjusting pieces C each of which is also pivoted by a set screw which
passes through it & the aforesaid plates; as well as through the jaws of the
handles D. The small toothed adjusting pieces have, at their further ends, another
bolt hole & as there are two bolt holes G & H in the jaws of both handles and at
the same distance from the hole at the end of the jaws, it follows that the hole in
the prolonged end of both the adjusting pieces can be placed in a line with either
of the two holes in the jaws of the handles and secured there by set screws..
The prolonged ends of the adjusting pieces are originally secured at G, so that
when the edges of the cutters are separated by wear they may be brought together
again by shifting the prolonged ends of the adjusting pieces from G to H and
securing them there by set screws.
A slight modification of this arrangement is shown in Figure 2. where the lower
ends of the cutters A are. pivoted to the adjusting pieces C and are operated on
through pivots instead of by teeth. The centre of motion of the adjusting pieces
is at where they are pivoted between the top & bottom plates B.
It will thus be seen that by removing the set screws K and shifting the lower
parts of these adjusting pieces till their holes coincide with the holes L in the
handles, the lower parts of both of the cutters A are thrust farther apart while
their cutting edges are brought nearer together.
The teeth of the cutters A, instead of being at the lower parts, are close to their
fulcra, gear into each other between the top and bottom plates M.
Set screws govern the proximity of the handles D & regulate the exact space
between the cutting edges of the cutters, as shown also in Figure 1.
The shearing power of this tool is obtained by the leverage of the cutters them-
selves multiplied by that of the adjusting pieces and the handles of which they
form part.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I would have it understood
that I do not confine myself to the exact arrangement of all the parts therein
described which may vary without departing from the nature of my invention, and
I declare that what I claim is :-
First. The moving of both cutters by means of teeth at their ends which gear
into small toothed adjusting pieces connected with the handles, or by small
adjusting plates, the upper ends of which are pivoted to the lower ends of the
cutters.
Second. The action and arrangement of the adjusting pieces whereby they can
be shifted to compensate for the wear of the cutters, by increasing the distance
between the lower ends of these cutters and thus lessening the distance between
their cutting edges.
Third. The general arrangement of the different parts whereby all the
requirements of a bolt cutter are provided for with the smallest possible number of
pieces, & the consequent quickness and ease with which any part may be removed
for repair or renewal.
Dated this 20th day of May 1893.
WILLIAM. MARCH.