A New or Improved Tool for Countersinking and Removing the Burs or Edges of Holes Drilled or Punched in Plates.
Year: 1891

page_text: Date of Application, 6th Feb., 1891
Complete Specification Left, 16th July, 1891-Accepted, 22nd Aug., 1891
PROVISIONAL SPECIFICATION.
A New or Improved Tool for Countersinking and Removing the
Burs or Edges of Holes Drilled or Punched in Plates.
I, JAMES SPIERS, Boilermaker of 20 Camden Street, Southwick, Sunderland in
the County of Durham do hereby declare the nature of this invention to be as
follows:-
My invention relates to a new or improved tool for countersinking and removing
the burs or edges of holes drilled or punched in plates and consists of a cranked bar
of steel or similar cutting material in one or more parts but in either case one or
more cutting edges are provided thereon situated in the case of tools required to
remove the burs or edges of holes on both sides of the plate at the same time on
opposite sides thereof.
The opposite cutting edges are formed by shaping the cutting edges therefor and
for different sizes of plates and holes corresponding tools may be used or the tool
may be regulated for this purpose by adjusting the distances between the cutting
edges. The plates may thus be cleaned so that there is nothing left thereon to prevent
their close contact with each other when being put together.
Dated this 10th day of Anvil 1801
A. CRAWHALL CHAPMAN,
3, St. Nicholas Buildings, Newcastle-on-Tyne,
Patent Agent for Applicant.
COMPLETE SPECIFICATION.
A New or Improved Tool for Countersinking and Removing the
Burs or Edges of Holes Drilled or Punched in Plates.
I, JAMES SPIERS, Boilermaker, of 20 Camden Street, Southwick, Sunderland in
the County of Durham 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 invention relates to a new or improved tool for countersinking and removing
the burs or edges of holes drilled or punched in plates and consists of a cranked bar of
steel or similar cutting material in one or more parts but in either case one or more
cutting edges are provided thereon situated in the case of tools required to remove
the burs or edges of holes on both sides of the plate at the same time on opposite
sides thereof.
The opposite cutting edges are formed by shaping the cutting edges therefor and
for different sizes of plates and holes corresponding tools may be used or the tool
may be regulated for this purpose by adjusting the distances between the cutting
edges. The plates may thus be cleaned so that there is nothing left thereon to
prevent their close contact with each other when being put together.
I will fully explain my invention with reference to the accompanying drawings in
which Figures 1 and 2 show side elevations of two slightly different forms of my
improved tool in position for countersinking and removing the burs or edges of holes
in a plate shown in section.
Figures 3 and 4 show cross-sections of the tool on lines A B and C D in
Figures 1 and 2, the sections showing the cutting edges of the tool arranged on
opposite sides thereof.
Figure 5 is a plan of Figure 1.
Figure 6 is a side view of a slightly different arrangement of tool in which the

page_text: latter is constructed in several parts for the purpose of adjusting the distances
between the cutting edges, Figure 7 being an end view of the same.
Throughout this description like letters or marks of reference designate like parts.
Referring to Figures 1, 2, 3, 4 and 5, e is a cranked bar of steel or similar cutting
material on which cutting edges e' are formed as shown in the drawings. 2 is a
handle into the socket of which the tool may be fixed in any convenient and secure
manner.
After a hole has been drilled in a plate and more especially after it has been
punched therein, there remains around the edge of the hole a slight rim or "bur"
the effect of which is to prevent or tend to prevent perfect contact between the
plates when being laid or put together.
By my invention I put the tool as shown in the figures, through the hole and by
firmly gripping the handle and at the same time pressing it slightly downwards and
turning it or pushing it round, the cutting edges el quickly remove these burs or
edges and leave a clean even plate surface around the edge of the hole. The tool
can be revolved in either direction by the operator the cutting edges being formed
on both edges of the tool for this purpose.
For countersinking purposes I use the form of tool shown in Fig. 1 by which
countersinking can be rapidly effected.
Referring to Figures 6 and 7, in this case the cranked bar is arranged so that the
distances between the cutting edges can be adjusted. Thus by varying the position
of the steel tool e³ passing through a hole or slot e, cut or formed in the bar e, by
means of the set pin e, the position of the cutting edge thereon can be varied
relatively to the position of the opposite cutting edge by which means one tool
can be set and used for varying thicknesses of plate instead of having to use
different tools to effect similar results on plates of varying thicknesses.
The said edge may either be formed (as in Figures 1 to 5) on the cranked bar
itself or it may be as shown at in Figures 6 and 7 a separate piece, dovetailed
into the cranked bar by which arrangement not only can the cutting edge itself. be
renewed without having to renew the whole tool, but by varying the amount of pro-
jection of the cutting edge, the distances between the cutting edges may be
adjusted. To effect this result, a set of pieces of different sizes may be kept in
stock.
The action of the apparatus described with reference to Figures 6 and 7 is in
every respect the same as that described in respect of Figures 1 to 5.
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. The new or improved tool for countersinking and removing the burs or edges
of holes substantially as herein set forth with reference to Figures 1, 2, 3, 4 and 5
of the drawings.
2. The new or improved tool for countersinking and removing the burs or edges
of holes substantially as herein set forth with reference to Figures 6 and 7 of the
drawings.
Dated this 9th day of July 1891
A. CRAWHALL CHAPMAN,
3, St. Nicholas' Buildings, Newcastle-on-Tyne,
Patent Agent for Applicant.