An Improved Rivet and Bolt Cutter.
Year: 1891

page_text: Date of Application, 17th Jan., 1891-Accepted, 21st Feb., 1891
COMPLETE SPECIFICATION.
An Improved Rivet and Bolt Cutter.
I, HERBERT JOHN HADDAN, of the firm of Herbert & Co., Patent Agents, of
18, Buckingham Street, Strand, London, W.C., Civil Engineer, do hereby declare
the nature of this invention, a communication to me from abroad by John
Helwig of Dubuque, State of Iowa, in the United States of America, Manufacturer,
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 a device adapted for heavy cutting, such as the cutting
or clipping of stay bolts on locomotives, fire boxes and boilers and the invention
consists in the details of construction set forth in the following Specification and
Claim and illustrated in the accompanying drawing in which,
Fig. 1 is a face elevation of a bolt or rivet cutter containing this invention partly
in section and with a plate removed.
Fig. 2 is a similar view with the plate in position.
Fig. 3 is an end elevation partly in section of Fig. 1.
Fig. 4 is a detail view of a jaw.
Fig. 5 is a section along x Fig. 4.
Figs. 6 and 7 are detail views of handle sections.
In the drawing, the letters A A' indicate two cutting jaws swinging about the
pivots C supported by the plates B. The cutting edges of the jaws are formed on
two blades or knives OO dovetailed into suitable sockets in the jaws. The
screws which retain the knives can be adjusted or screwed further in or out so
that said screws hold the cutting edges of the knives more or less away from the
plate or boiler so that the knives cut off the bolt nearer to the surface of the plate
or boiler or further away therefrom as desired.
The holes T in the knives are somewhat larger than the screws Q so that the
latter are not exposed to strain but simply serve to prevent the knives from falling
out of the dovetailed sockets while the screws are always free to be adjusted.
The strain on the knives during the cutting is taken up by the socket walls.
The cutting edges of the knives are concave and situated in the same plane with
one another so that when desired, said edges can be made to cut a bolt close to the
plate from which it projects.
The concave cutting edges enable the knives to get a grip on the bolt so that
they will not slip during the cutting. As the concave cutting edges enable the
cutter to readily set about the edges of the bolt to be cut, said cutters will make a
clean cut about said bolt edge.
The pivots C can be formed by screws which hold the plates B together and a
locking plate R secured by a screw S engages the heads of the screws C so that
said screws will be prevented from accidentally turning or loosening.
The inner ends of the jaws are provided with knuckles V which enter sockets in
the heads D forming the upper ends of the actuating handles. The gears E connect
the handles to one another and the upper ends W of the gears are straight. Said
straightened ends form stops to prevent excessive spreading of the handles. Such
excessive spreading is to be avoided since thereby the outer ends of the walls of
the sockets in the heads D would be liable to breakage by being forced against
the jaws A A'.
The handles are each shown made in two parts G H, held together by teeth or
cogs I and screws K. One section of each handle has a knuckle X entering a
suitable recess in the outer handle section and when the screws K are loosened
and the cogs I freed from engagement with one another, the handle section H can
be swung or set to any desired angle in relation to the handle section G and
fixed at such angle. The handles are prevented from too close approach to one
another by stops L.

page_text: When the stops L or the cutting edges are worn down the handle sections H
would gradually approach so close to one another that the handle or fingers could
not be passed between said handle sections to spread the latter. By then adjusting
said handle sections H at a suitable angle with relation to the sections &, said
sections H will be separated sufficiently to enable a hold to be obtained on said
sections H.
The stops L consist of screw stems which pass loosely through holes or sockets
in the handle sections G and are fixed in position by nuts Y. One nut is screwed
onto stem or screw on the outside of the section G and another nut is screwed
onto said stem on the inside of said section. Said nuts being screwed onto the
stem so as to press firmly against the section G will hold the stem or stop L in
place.
A cord or cable M running over sheaves or blocks Z and wound by a
handle or crank N on a suitable drum can be used for moving the handles. Each
handle has two sheaves so that considerable force can be obtained for contracting
the handles.
The handles are adapted to oscillate about suitable pivots F, supported by the
plates B B. The gears E E connect the handles so that said handles will separate
and approach one another equally, thus causing the motion of one jaw to equal the
motion of the other jaw. Formerly this equality of action of the jaws was secured
by a so-called equalizer, said equalizer being a stud, which limited each jaw in its
motion towards the other jaw, each jaw being provided with a recess or cut out
portion to engage said equalizer or stud. By omitting the equalizer the device is
cheapened and as the jaws no longer need to be recessed to accomodate the
equalizer said jaws remain much stronger than when they were recessed as
described.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. The combination with the jaws A. A¹ provided with dovetailed sockets and
knives seated in said sockets, of retaining screws for said knives, said screws being
adjustably secured to the jaws so as to regulate the place at which the knives are to
act, said knives being provided with slots or enlarged holes for the passage of the
screws so that the screws are not exposed to the strain on the knives during the
operation of cutting substantially as described.
2. The combination with the actuating handles, of cutters having longitudinally
concaved cutting edges actuated in the same plane with one another so as to cut on
a bolt close to the plate and prevent the cutters slipping across the bolt substantially
as described.
3. The combination with the jaws A A' the plate B and the screws C forming
pivots for the jaws and made to hold the plates B together, of a locking plate R
interposed between and having its extremities fitted against the screws C to prevent
turning of the latter, and a screw S passed through the locking plate and screwing
into one of the plates B, substantially as described.
I
4. The combination with the jaws A A¹ of handles for actuating said jaws, each
handle being made in two sections G H adjustably united by a screw K and cogs
for moving the lower handle section to and from the other section, one handle
section being provided with a semi circular knuckle X made to fit into a corre-
sponding recess in the other handle section so that part of the strain is taken off
the cogs and taken up by the knuckle recess substantially as described.
Dated this 17th day of January 1891.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.