Improved Punching Mechanism for Forming Teeth on or for Serrating the Cutting Edges of Tools or Chisels for Cutting Stone.
Year: 1891

page_text: Date of Application, 13th Feb., 1891
Complete Specification Left, 13th Nov., 1891-Accepted, 19th Dec., 1891
PROVISIONAL SPECIFICATION.
Improved Punching Mechanism for Forming Teeth on or for
Serrating the Cutting Edges of Tools or Chisels for Cutting
Stone.
We, CHARLES WILKINSON HARDWICK and HENRY VARLEY ROBINSON, both
of Keighley in the County of York, Builders and Contractors, do hereby declare
the nature of this invention to be as follows, that is to say :-
It consists of improved punching mechanism for forming teeth on, or for serrating
or notching the cutting edges of mason's tools or chisels, whereby the operation of
forming these teeth or notches is greatly facilitated and said teeth or notches are
more evenly formed than they have been heretofore.
To attain the object of our invention we make use of a vertically moving die or
punch holder or carrier (preferably square in cross section) mounted in suitable
bearings, these same bearings forming support for the said carrier's operating levers.
One of these levers is mounted to extend over the upper end of the die carrier so as
to lay hold thereof by entering a loop or opening formed thereon its other end
extending beyond its fulcrum so that a connecting rod may couple it to a lower
hand lever or if desired to a pedal or foot-lever, by which the die carrier is to be
operated.
Upon the bed plate is mounted a die-piece to correspond with that in the vertically
moving carrier, and in an appropriate position relatively with this die-piece, is fixed
a suitable guide or gauge to determine the position that the chisel or tool has to
assume when being placed thereon for its edge to be properly notched or serrated.
The dies or punches and punching plates may be constructed or formed so that
either only one of these notches or serrations may be formed at each operation, or
so that the whole of the chisel or tool's cutting edge may be notched or serrated at
one movement, the latter arrangement being preferable, since the whole operation is
performed while the tool's edge is hot or before its temperature has been reduced to
the normal heat of the other part of the said tool.
The method of forming the teeth on mason's tools as above described, is equally
applicable for operation upon the tools that are to be used in machines for planing
or masoning stones as for those that are to be manually employed.
Dated this 12th day of February 1891.
CHARLES WILKINSON HARDWICK.
HENRY VARLEY ROBINSON.
Per Samuel Hey,
COMPLETE SPECIFICATION.
for
5 Improved Punching Mechanism for Forming Teeth on or
Serrating the Cutting Edges of Tools or Chisels for Cutting
Stone.
We CHARLES WILKINSON HARDWICK and HENRY VARLEY ROBINSON, both
of Keighley in the County of York, Builders and Contractors 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, that is
to say :-
It consists of improved punching mechanism for forming teeth on or for serrating
or notching the cutting edges of mason's tools or chisels whereby the operation of

page_text: forming these teeth or notches is greatly facilitated and said teeth or notches are
more evenly formed than they have been heretofore.
In the accompanying sheets' of drawings
Figs. 1, 2 and 3 are respectively side front and top views of our improved
punching mechanism.
Fig. 4 is a side elevation of a sufficient portion of the mechanism to shew the
attachment thereto of pedal mechanism.
Figs. 5 and 6 are drawings in detail of parts hereinafter referred to.
Fig. 7 is top view showing die-plate for forming several notches or serrations at
one operation, the said die-plate having cutting edges on both sides of it so that it
may be turned around when one side is worn out.
To attain the object of our invention we make use of a vertically operating die
or punch holder or carrier a (preferably square in cross-section) mounted in suitable
bearings, the said bearings 6 being used as supports for the operating levers c
and d. The lever e is mounted to extend over the upper end of the carrier or
holder a so as to engage with same by entering a loop or slot formed thereon or
therein, the other end of the lever e being made to extend beyond its fulcrum c¹ so
that a connecting-rod e may couple it to a hand lever d or if desired by the extension
of the rod e join said lever c to the pedal or foot-lever f, by which the carrier a is
to be operated.
Upon the bed-plate &' is mounted a die-piece g to correspond with the die-piece g¹
carried by the holder a, and in an appropriate position relatively with this die-
piece is fixed a suitable guide or gauge à to determine the position that the chisel
or tool (as k) has to assume when being placed thereon for its edge to be properly
notched or serrated as shewn by Fig. 6.
g
The dies or punches g and plates g' may be constructed or formed so that they
will only form one notch or serration at each operation, or they may be constructed
so that they will notch or serrate the whole of the tool's cutting edge at one move-
ment as will the dies or punches and plates shewn in the drawings Fig. 7 this latter
arrangement being preferable since the whole operation is performed while the tool's
edge is hot or before its temperature has been reduced to the normal heat of the
other part of the said tool.
The method of forming teeth or serrations on mason's tools as above described,
is equally applicable for operation upon the tools that are to be used in machines
for planing or, masoning stone as for those that are to be manually employed.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is
1. The combination and arrangement of parts used in the construction of punching
mechanisin substantially as and for the purpose described, each and all of said parts
being formed as specified.
This 19th dow of Navambar 1901
CHARLES WILKINSON HARDWICK.
HENRY VARLEY ROBINSON.
Per Samuel Hey,
Agent.
.1.