כלי more IN TOOTHED WHEELS, AND IN MACHINERY FOR PREPARING THE WOOD PATTERNS FOR SAME, WHICH MACHINERY IS ALSO APPLICABLE TO OTHER SIMILAR PURPOSES.
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Henry Shaw at the Office of the
Commissioners of Patents on the 31st May 1883.
HENRY SHAW, of Sheffield in the County of York, Engineer,
"IMPROVEMENTS
כלי
more
IN TOOTHED WHEELS, AND IN MACHINERY FOR PREPARING THE WOOD PATTERNS
FOR SAME, WHICH MACHINERY IS ALSO APPLICABLE TO OTHER SIMILAR PURPOSES.
My invention relates to improvements in tothed wheels and refers
particularly to those known in the trade as "helical" wheels and also to the
apparatus for forming the teeth of the wood patterns from which the said helical
wheels are to be moulded and cast, whether of the ordinary or improved form,
The apparatus when slightly modified being also adapted to cutting the teeth of
metal" helical wheels
"
My improvement in helical wheels consists in forming the teeth of an arched or
curved shape, instead of the usual angular shape, as by this configuration the metal
of the teeth is in the strongest position for resisting both the ordinary driving
strain, or sudden concussions.
The Machine or apparatus for cutting or forming the teeth in wood for the
patterns for ordinary angular helical wheels, consists of a framework having two
horizontal and parallel slides, each slide carrying a headstock or bearing supporting
a revolving shaft and cutter head, which can be set to any suitable angle, and
which is driven or rotated by ordinary means from a countershaft.
The headstocks with the shaft and cutterhead are moved horizontally and
simultaneously by means of gearing which connects the two slide screws, and may
be worked either by hand or mechanical power.
Below the cutterhead is a swing table, on which the wood to be operated upon
is secured.
The Table is fixed upon the top of a vertical arm, provided with an adjustable
axis, that can be raised or lowered, upon vertical rods or slides, so as to give any
lesired radius or radial line of motion to the table, the axis of the table thus
epresents the centre of the wheel for which the pattern tooth or teeth is or are to
be cut or formed. An adjustable crank and lever motion fixed to the underside of
he framework and attached both to the arm of the table, and to one of the sliding
[Price 2d.]

page_text: headstocks, imparts to the table a slow rocking motion upon its axis; thus there is
the combined horizontal traverse motion, with the rotary action of the revolving
Cutter simultaneously with the segmental rocking movement of the table (and
pattern) upon its axis and these combined movements of the cutter and the wood
pattern, enable me to produce a correct and perfect tooth pattern for any desired
diameter of wheel
In forming a pattern for an improved "arch" helical wheel, instead of the cutter-
construct a headstock to carry a rotating
head and shaft being made to revolve,
drill spindle, the drill, cutter, or flyer working in the wood, similarly to an
ordinary traversing drill-the arched shape of the helical tooth being obtained by
a modification of the crank lever motion hereinbefore described, so that it shall
produce an increasing or diminishing rate of speed in the movement of the table.