Improvements in Expanding Tools and Cutters for Grooving and other Wood Working Machines.
Year: 1898

page_text: Date of Application, 30th Sept., 1898-Accepted, 26th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in Expanding Tools and Cutters for Grooving and
other Wood Working Machines.
We, JOSEPH WILLIAM WADKIN, of 100, Mere Road, Liecester, in the County of
Leicestershire, Engineer, and DENZIL JOHN JARVIS, of Charles Street, Leicester, in
the County of Leicestershire, Shop Fitter, do hereby declare the nature of this in-
vention and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
Our invention relates to an improved expanding tool for grooving trenching and
rebatting wood work in wood working machines having revolving cutters in which
the cutters are made to suit any required width of groove up to four times the normal
width of the cutters easily adjustable and actuated by a compound or differential
screw nut and segments.
This invention consists of a series of cutters fitted into various segments each seg-
ment being controlled and actuated by screw threads of various pitches so that by
turning a milled headed or other form of collar each segment is advanced or with-
drawn in a certain proportion giving any desired width of groove. One set of cutters
are set for cutting the sides of the groove and another set of cutters are set to cut
out the intervening space. By this means a much cleaner cut is made even with
cross grained wood.
The tool is clamped onto a revolving spindle of any suitable machine and the
depth of groove is governed by the usual appliances as a movable table or adjustable
spindle.
In
The cutters are easily removed and replaced. Each cutter being fitted in a dove-
tail groove and held by a screw or the cutters may be soldered into the grooves.
some cases the segments are made of steel and formed also for cutting thereby
dispensing with loose cutters.
In the accompanying drawings the same letters are used for like parts.
Fig. 1 is a section of the tool complete.
Fig. 2 is a face view of the tool complete.
Figs. 3 & 4 are section and end view of the differential nut.
Figs. 5 & 6 are two views of the milled collar.
Figs. 7 & 8 are two views of the first segment.
Figs. 9 & 10 are two views of the second segment.
Figs. 11 & 12 are two views of the third segment.
Figs. 13 & 14 are two views of the fourth segment.
Fig. 15 shews two views of the face cutter.
Fig. 16 shews two views of the picking cutter.
A is the spindle of the machine which is provided with a nut for clamping the
tool. B is the milled collar connected by pins or screws to the compound nut C and
turns with it or the parts B and C may be coupled by means of a boss with flats or
keys or if preferred the collar may have tominy holes for turning but in any case the
collar and nut must be capable of being clamped on the spindle. C is the compound
or differential nut having two or more screw threads of different pitches into which
the segments E, F, and G engage so that with each turn of C the said segments will
ha aduanaod or withdrawn no the once may ha neonationally to thain nitaha

page_text: The outer segment D is free to turn but is not advanced or withdrawn like the other
segments although it may carry two or more cutters. H, H, are recesses for the face
cutters. JJ J J, are recesses for the picking cutters.
H¹ is the face cutter sharpened on the sides. J¹ is a picking cutter sharpened so as
to cut out the intervening parts of the wood.
Any number of segments and cutters may be used according to the size and nature
of the work.
Having now particularly described and ascertained, the nature of my said inven-
tion and in what manner the same. is to be performed we declare that what we
claim is :-
An improved tool with segments and cutters capable of expanding to four times the
normal width of the cutters controlled and actuated by differential screw threads for
grooving wood substantially as described and set forth.
Dated this 28th day of September 1898.
WASHINGTON HUDSON,
Agent for the Applicants,
"Kempscote," Coleraine Road, Westcombe Park, London, S.E.