Improvements in Plane Irons.
Year: 1895

page_text: Date of Application, 25th Feb., 1895
Complete Specification Left. 25th Nov., 1895-Accepted, 1st Feb., 1896
PROVISIONAL SPECIFICATION.
Improvements in Plane Irons.
I DUNCAN MCLEAN of No. 126 Grey Street North Shields Journeyman
Joiner do hereby declare the nature of this invention to be as follows:-
A grindless plane iron which is when used placed between the ordinary plane
iron and its cover, & when in use, being made of very good and thin steel, will
not, with ordinary care, ever require grinding, and thus be a great saving of the
workmans time.
Dad: -1
1005
Improvements in Plane Irons.
I DUNCAN MCLEAN of Number 126 Grey Street North Shields Joiner do hereby.
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 :-
This invention relates to an improvement in fixing and regulating thin cutting
irons for planes between the bed and face iron used in an ordinary plane or between
specially constructed bed and face irons screwed together and rivetted or otherwise
fixed together at the outer end away from the cutting edge.
In carrying out my invention a bed iron is constructed with either an oval slot
in or about the centre of it or with a long slot terminating in or about the centre.
in a circular hole so as to allow sufficient room for a screw to pass freely through,
the head of the screw to bed on the underneath side of the bed iron. Towards
the outer end is a hole which is threaded and engages a screw passing through the
face iron and thin cutting iron.
Each side edge of the bed iron may be either left unchecked or checked to a
distance from the outer end coextensive with the length of cutting steel of the
thin iron so that as the cutting iron is moved forward through loss of length an
angular projection of the cutting iron is still left whereby the same may be more
exactly adjusted and set forward.
The face iron is constructed with a threaded nuthole near the centre which
engages the screw passing through the bed iron and the thin cutting iron so that
when screwed up the centre cutting iron is fixed between the bed iron and face
iron. Near the outer end of the face iron is a small oval slot which is counter
sunk through which a screw passes engaging the hole on the bed iron the head of
the screw bedding on the counter sunk slot of the face iron.
Each side of the face iron may be left unchecked or checked to a distance
coextensive with the check of the bed iron and for the same purpose. The face
iron may be made slightly hollow towards the outer end so as to take the packing.
Three slips of compressible or incompressible packing are fastened to the face iron
the first in the hollow near the cutting end the second near the middle and the
third towards the outer end.

page_text: The cutting iron is constructed of very thin rectangular pieces of steel or iron.
It is fitted either with a long slot running from the outer end of the place till a
reasonable distance from the cutting end or with a long slot terminating in a
circular hole so as to allow the other screws, which are used for bringing the face
and bed irons in close contact, 'to pass freely through and also to allow the cutter
to be slipped in between the face and bed irons and taken out and shifted forward
on the same wearing away or for the purpose of being sharpened.
Rigidness of the cutting iron is obtained by screwing up the bed and face irons
by means of the screw which bind the three together and thereby causes the
packing to grip the cutting iron firmly.
When the three irons are screwed up together they may be placed in the plane
and the whole will move forward as one iron the cutting end of the thin iron
being finally adjusted by the projection of the thin iron over the checks or over
the ends of bed and face irons.
The annexed drawing will more fully describe my invention :-
Fig. 1 represents sectional view of my improved plane iron shewing the three
irons screwed together ready for use. The insertion of the packing is shewn
at J, Ji, Jii.
Figs. 2 & 2 represent plans of bedding iron with a hole or slot A to allow
screw D as shown in Fig. 1 to pass freely through it and with a threaded hole E
to engage screw C as shewn in Fig. 1.
Figs. 3 & 3 represent plan of cutting iron with a long slot B to allow screws C
and D to pass freely through.
Fig. 4 and 4 represent plan of face iron with a slot F through which screw C
passes and a threaded hole H which engages end of screw D.
Fig. 5 represents an enlarged sectional view of the edges of the iron so as to
illustrate their relative positions when set.
Fig. 2^ represents an ordinary plane iron nearly worn out and with a hole E and
Fig. 4 represents an ordinary cover with hole F
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 construction and arrangement of the bedding iron as and for the
purposes herein before described and illustrated by my accompanying drawings.
2. The construction and arrangement of the cutting iron as and for the purpose
'herein before described and illustrated by my accompanying drawings.
3. The construction and arrangement of the face iron as and for the purposes
herein before described and illustrated by my accompanying drawings.
4. The construction and arrangement of the packing to be attached to the face
iron as and for the purposes hereinbefore described and illustrated by my accom-
panying drawings.
Dated this 23rd day of November 1895.
DUNCAN M°LEAN.