Improvements in Spoke-shaves and other similar Tools.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Spoke-shaves and other similar Tools.
I, EDWARD PRESTON, Director of Edward Preston and Sons, Limited, of No. 21,
Whittall Street, Birmingham, in the County of Warwick, Tool Manufacturers,
do hereby declare the nature of this invention to be as follows:-
My invention consists of the improvements hereinafter described on an invention
for which Letters l'atent were granted to me numbered and dated
12,458, October 19th 1885 for, "Improvements in spoke-shaves planes and other
similar tools." The said patented invention consists of arrangements for facilitat-
ing the adjustment of the cutting irons of the said tools.
In order that my present invention may be the better understood I remark that
in the said patented invention the cutting iron is capable of motion only in the
line of the axis of the adjusting screw that is in a line perpendicular to the slot
in working face of the tool. In consequence of this restriction to the motion
of the cutting iron the exercise of great care and skill is required in the re-grind-
ing of the cutting edge of the iron as otherwise the cutting edge of the re-ground
cutting iron may, when inserted in its place in the tool be found to be slightly
inclined to the slot in the working face of the tool in which case the further re-
grinding of the iron is necessitated which results in undue wear of the cutting
iron.
The object of my present invention is to permit of the ready adjustment of the
re-ground cutting iron in the manner hereinafter described.
In constructing say a spoke-shave according to my present invention I make
the elongated guiding boss or projection into a screwed hole in which the set or
fixing screw takes and with which the longitudinal slot in the cutting iron
engages with slightly curved convex sides and I make the cross slot in the top
of the cutting iron in which the flange or collar of the adjusting screw nut or pin
engages curved the radius of the curve of the said slot, having for its length the
distance or approximately the distance of the said cross slot from the axis of
the set or fixing screw of the cutting iron. I make the upper face of the collar
of the adjusting screw nut or pin which bears against the upper edge of the cross
slot rounded that is to. say a portion of the surface of a sphere. By constructing
the parts in the manner described the cutting iron is made capable of a slight
angular or swivelling motion on the boss or projection of the tool occupying the
longitudinal slot of the cutting iron in consequence of which should the cutting
edge of the iron or re-grinding be found not true that is to say not parallel with
the slot in the working face of the tool by the slight tap of a hammer or other
tool on one or other side of the top of the cutting iron the set or fixing screw being
in a relaxed state the position of the iron may be so changed as, to bring its cutt-
ing edge truly parallel to the slot in the working face and the necessity for further
re-grinding obviated.
Dated this Fifteenth day of July 1898
W. T. WHITEMAN,
Agent for the Applicant.

page_text: Improvements in Spoke-shaves and other similar Tools.
I, EDWARD PRESTON, Director of Edward Preston and Sons Limited, of No. 21,
Whittall Street, Birmingham, in the County of Warwick, Tool Manufacturers
do hereby declare the nature of my 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 consists of the improvements hereinafter described on an invention
for which Letters Patent were granted to me numbered and dated respectively
12,458, October 19th 1885 for, "Improvements in spoke-shaves, planes and other
similar tools." The said patented invention consists of arrangements for facilitat
ing the adjustment of the cutting irons of the said tools.
In order that my present invention may be the better understood I remark that
in the said patented invention the cutting iron is capable of motion only in the
line of the axis of the adjusting screw, that is, in a line perpendicular to the slot
in the working face of the tool. In consequence of this restriction to the motion
of the cutting iron the exercise of great care and skill is required in the re-grind-
ing of the cutting edge of the iron as otherwise the cutting edge of the re-ground
cutting iron may, when inserted in its place in the tool, be found to be slightly
inclined to the slot in the working face of the tool in which case the further re-
grinding of the iron is necessitated which results in undue wear of the cutting
iron.
The object of my present invention is to permit of the ready adjustment of the
re-ground cutting iron in the manner hereinafter described.
In constructing, say, a spoke-shave according to my present invention I make
the elongated guiding boss or projection, into a screwed hole in which the set or
fixing screw takes and with which the longitudinal slot in the cutting. iron
engages, with slightly curved convex sides and I make the cross slot in the top
of the cutting iron in which the flange or collar of the adjusting screw nut or. pin
engages, curved, the radius of the curve of the said slot having for its length the
distance or approximately the distance of the said cross slot from the axis of
the set. or fixing screw of the cutting iron.
The upper face of the collar of the adjusting screw nut or pin which bears
against the upper edge of the cross slot may be rounded, that is to say, made a
portion of the surface of a sphere.
Figure 1 of the accompanying drawing represents in front elevation a spoke
shave containing the improvements constituting my invention; Figure 2 is a
vertical section of the same taken on the dotted line, Figure 1.
Figure 3 represents the said tool in front elevation after the removal of the set
or fixing screw, clamping plate or iron and cutting iron and Figure 4 is a vertical.
section taken on the dotted line y, y Figure 3.
Figure 5 is an elevation of the detached cutting iron.
Figure 6 is an elevation of a modified cutting iron.
The same letters of reference indicate the same parts in the several figures-of
the drawing.
a is the guiding boss or projection on the body part of the spoke-shave on
which guiding boss the longitudinal slot d in the cutting. iron h (see Figure 5)
takes; a is the screwed hole in the boss a into which the set or fixing screw. b is
screwed for binding or firmly securing the clamping plate or iron c and cutting
iron to the spoke-shave. The sides a¹, a¹ of the guiding boss a are slightly
curved (see Figure 3) to permit of the cutting iron h partaking of a slight angular

page_text: motion in one or other direction on the guiding boss. Or the guiding boss a
may be made circular and of a diameter to fit the longitudinal slot d in the cutting
iron h. The upper cross slot e in the cutting iron h, for receiving the collar f of
the adjusting screw nut f, which is screwed on the screw g, is curved, the length
of the radius of the curved slot e being preferably the distance between the said
crossing slot e and the axis of the screwed hole a³. Or the crossing slot e may
have the form represented in Figure 6 in which case no bevilling or rounding
of the collar f of the adjusting screw nut f is necessary.
By constructing the parts, namely the boss a, a¹ (or the modified boss described)
and the cross slot e in the cutting iron in the manner described and illustrated
the cutting iron h is capable of a slight angular or swivelling motion on the boss
or projection a, a¹ occupying the longitudinal slot d of the cutting iron h, the cross
slot e working on the collar 2 of the adjusting screw nut f. By permitting of
an angular in addition to a longitudinal adjustment of the cutting iron h the said
cutting iron, should the cutting edge be found after re-grinding not true, that is
to say, not parallel with the slot in the working face of the tool can by the slight
tap of a hammer or other tool on one or other side of the top of the said cutting iron
(the set or fixing screw being in a relaxed state) be so changed as to bring its
cutting edge truly parallel to the slot in the working face and the necessity for
further re-grinding obviated.
Having now particularly described and ascertained the nature of my
invention and in what manner the same is to be performed, I declare that I claim
as my invention:-
In spoke-shaves and other similar tools of the kind herein referred to-making
the guiding boss on which the longitudinal slot of the cutting iron works and the
cross slot in the said cutting iron with which latter the acting collar of the adjust-
ing screw nut engages, of such a shape or curvature that the cutting iron is capable
in addition to a motion in the direction of its length, of an angular motion on
the guiding boss substantially as and for the purpose herein before described and
illustrated in the accompanying drawing.
Dated the Twenty-fourth day of February 1899.