Apparatus for Outting Keyways in Shafts, and generally for Cutting Grooves and Slots.
Year: 1893

page_text: Date of Application, 19th Dec., 1893
Complete Specification Left, 18th Sept., 1894-Accepted, 20th Oct., 1894
PROVISIONAL SPECIFICATION.
Apparatus for Outting Keyways in Shafts, and generally for Cutting
Grooves and Slots.
I, JOHANN HEINRICH SPOERL, Civil Engineer, of 34 Bolkerstrasse, Düsseldorf,
in the German Empire, do hereby declare the nature of this invention to be as
follows:-
My invention has for its object, to produce a simple and easily portable apparatus
for cutting grooves and slots by means of milling cutters, which apparatus can be
Conveniently attached to a machine tool and worked by hand.
The apparatus chiefly comprises a stand provided with a pair of parallel guide
cheeks for a slide, and carrying a table or platform for holding the piece of work,
and a slide adapted to move along the said guide cheeks (preferably in a horizontal
line) and carrying on its front a screw spindle perpendicular to the guide (therefore
preferably vertical) as well as a worm wheel gearing into the said spindle, so as to
receive rotary motion from the latter. The said worm wheel serves also as a crank
disc, the crank pin of which can be adjusted and fixed in a radial slot. To the
crank pin is attached one end of a connecting rod having its other end attached to
a stationary fulcrum pin secured to a backward extension of the guide cheeks or
bed of the slide, so that the turning of the spindle produces a slow to and fro motion
of the slide and of the parts mounted on it. The said fulcrum pin is fixed in a slot
parallel to the motion of the slide, and can be adjusted along the same, in order to
regulate the position of the groove or slot produced by the rotary cutter fixed to the
lower or free end of the screw spindle.
The length of the grooves or slots may be regulated by adjusting the position of
the crank pin in the crank disc.
The screw spindle is guided near its lower end by a bearing, and guided and
supported near its upper end by a sleeve which is screwed into a stationary head
serving as a screw nut for the said sleeve. The latter is provided with a hand
wheel or rim for turning the sleeve and thereby producing the axial feed motion of
the screw spindle, while the rotary motion of the spindle is produced by a crank
fixed to the upper end of the same.
The screw thread on the screw spindle is chosen in such a manner (left handed)
that the pressure on the spindle produced by the turning of the worm wheel is
always supported by the adjusting sleeve and nut, and back lash is avoided.
Instead of a crank disc for producing the to and fro motion of the slide, an
eccentric may be used. Or the worm wheel may turn a toothed pinion coaxial
with the worm wheel and gearing into an internally toothed frame pivoted to
the slide. As the toothed inside of this frame forms a rectangular or other
closed figure, the pinion will not only propel the frame horizontally, but also
lift and lower the same at the end of each stroke or travel.
Dated this 18th day of December 1893.

page_text: Apparatus for Cutting Keyways in Shafts, and generally for Cutting
Grooves and Slots.
I, JOHANN HEINRICH SPOERL, Civil Engineer, of 34 Bolkerstrasse, Düsseldorf,
in the German Empire, 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:—
2
My invention has for its object, to produce a simple and easily portable
apparatus for cutting grooves and slots by means of milling cutters, which
apparatus can be conveniently attached to a machine tool and worked by hand.
The apparatus is shown by the accompanying drawings in which Fig. 1 is an
elevation and Fig. 2 a partial section, Fig. 3 is a modification of part of the
apparatus. It chiefly comprises a stand a provided with a pair of parallel guide
cheeks for a slide, c, and carrying a table or platform 6 for holding the piece of
work, and a slide c adapted to move along the said guide cheeks, (preferably in a
horizontal line), and carrying on its front a screw spindle d perpendicular to the
guide, therefore preferably vertical, as well as a worm wheel e gearing into the
said spindle d, so as to receive rotary motion from the latter. The said worm
wheel serves also as a crank disc, the crank pin f of which can be adjusted and
fixed in a radial slot in the wheel e. To the crank pin is attached one end of a
connecting rod 9 having its other end attached to a stationary fulcrum pin secured
in the slot h of a backward extension of the guide cheeks or bed of the slide, so
that the turning of the spindle d produces a slow to and fro motion of the slide c
and of the parts mounted on it. The said fulcrum pin is fixed in the slot h
parallel to the motion of the slide, and can be adjusted along the same, in order to
regulate the position of the groove or slot produced by the rotary cutter fixed
to the lower or free end of the screw spindle d.
The length of the stroke may be regulated by adjusting the position of the
crank pin in the grooves or slots of the crank disc e.
The screw spindle is guided near its lower end by a bearing, and guided and
supported near its upper end by a sleeve i, which is screwed into a stationary
head serving as a screw nut for the said sleeve, as shown in the section Fig. 2.
The latter is provided with a hand wheel or rim for turning the sleeve and thereby
producing the axial feed motion of the screw spindle d, while the rotary motion of
the spindle d is produced by a crank arm fixed to the upper end of the same.
The screw thread on the screw spindle is chosen in such a manner (left handed)
that the pressure on the spindle d produced by the turning of the worm wheel e,
is always supported by the adjusting sleeve and nut, and back lash, is avoided.
Instead of a crank disc for producing the to and fro motion of the slide, an
eccentric may be used. Or the worm wheel e may turn a toothed pinion k, coaxial
with the worm wheel, and gearing into an internally toothed frame (shown in
Fig. 3) pivoted to the slide. As the teeth inside of this frame follow a rectangular
or other closed figure, the pinion will not only propel the frame horizontally,
but also lift and lower the same at the end of each stroke or travel.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
1. In a hand apparatus for cutting keyways grooves or slots, the combination of
a traversing slide c, carrying a screw spindle d having a cutting tool at one end,
and a crank arm and feeding sleeve i at the other, a worm wheel and crank disc
engaging with the enindled andra

page_text: whereby the said slide is traversed on the turning of the crank arm, substantially
as herein shown and described.
2. The combination of a screw spindle d having a left handed thread thereon
with a crank disc worm wheel e engaging therewith mounted upon and operating
to move a slide c, substantially as and for the purpose herein described and
shown.
Dated this 18th day of September 1894.
FAIRFAX & WETTER,
433, Strand, London, Agents for the Applicant.