An Improved Machine for Cutting or Planing the Teeth of Spur- wheels and the like.
Year: 1894

page_text: Date of Application, 11th Aug., 1894-Accepted, 11th Oct., 1895
COMPLETE SPECIFICATION.
An Improved Machine for Cutting or Planing the Teeth of Spur-
wheels and the like.
A communication by PETER LANGEN, of Paradiesstrasse, Kalk, near Cologne, in
the Empire of Germany, Machine Fitter.
I, GEORGE CECIL DYMOND M.I. Mech. E., of the Agency for Foreign Patent
Solicitors 6 Lord Street, Liverpool and 6, Bank Street, Manchester both in the
County of Lancaster and 323 High Holborn in the County of Middlesex Patent
Agent, 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 :-
.
This invention relates to a machine by means of which it is possible to cut or
plane the teeth of spur wheels and the like.
The invention consists essentially in the combination of various supports, so that
the tocl may make the various necessary movements, and in a template corre
sponding to the form of the teeth, by means of which the tool is forced to produce
the desired form of teeth.
On the accompanying drawings:
Figure 1 is a front view of the machine;
Figure 2, a plan view of the same;
Figure 3, a side view ;
Figure 4, a rear view showing the driving wheels ;
Figure 5, a view of the smaller group of wheels for moving the working tool;
Figure 6 is a detail view of one of the supports.
'
;
1
The frame support a has two flat pieces b₁ which are movably arranged on a
pivot in order to admit of adjustment. They may be moved in slots to any
desired angle to suit the toothed or spur wheel, and be then fixed in the rear by
means of screws. On these flat pieces 6 b¹, cross supports c c are arranged, which,
by means of cranks gg', have the desired stroke, and receive a movement to and fro
by means of the links h. The movement of these cranks g g' takes place from
the cog wheels which are mounted on the spindles which are connected with
the crauks gg. The spindles rest in the bearings or brackets kk' (Figure 2),
which are screwed on the rear of the cast pieces and share in the concentric
movement or adjustment of the same. The cog wheels which are mounted on
the spindles i engage with a cog wheel m, which is driven from a small wheel n
by means of the driving shaft o, as shown more particularly in Figure 4. The
spindle of the cog wheel m and the driving shaft o of the wheel n rest in a
common frame (Figure 3).
Two further supporting bars d d' are also screwed on the supports c c', which
bars d d' may be revolved on a central pin. During the working of the machine,
these supports d d' are of course not revolved but are screwed fast to the supports c c².
The central pin is only employed in order that these supports may be adjusted
according to the teeth which are to be planed. These support bars d d' carry four
smaller supports e e e² and e³, which are not provided with spindles, but which are
movable along the bars by spring impulsion. The supports e e' e² and e³ have the
form of an angle, as shown in Figure 3, and carry on these angles, four further
supports ff f³ facing one another, which hold the tools. These latter are

page_text: moved forward transversely to the to and fro movement received from the
supports cc by the rotation of the spindles in the nuts q g', said spindles being
mounted in and sharing the reciprocating movement of the said supports c c'.
This forward movement towards the work takes place in the following way:
The spindles end in four cog wheels sssa (Figure 5), each two of which
engage with one another. A ratchet wheel t is keyed in front of the two upper
wheels s on each of the axles rr, with which ratchet wheel a pawl u u' engages,
which is seated on bars vel, which oscillate on the spindles (Figures 3 and 5).
The heels s, together with the spindles rr, and the supports fff³ join in the
to and fro movement as aforesaid of the pieces cd c' d', for which object a sufficient
opening is made in the frame.
?"
The cast frame w (Figures 2, 3 and 5) which is placed in front of the wheels ss,
holds a wrought iron bar w from which the pins ex project in such a way that the
hanging bars v' encounter the same, when the machine makes its to and fro
motion. By this shock, each pawl u moves its ratchet wheelt forward, and the
wheels s, and with them the spindles and also the supports ff 12 and ƒ³ are
thus pushed forward towards the work. As the hanging bars vv have a certain
amount of play between the pins a before engaging the latter, there will always be
a certain amount of play or movement of the supports e ele²e before the sup-
ports ffff are moved towards the work by the spindles ¹² 7³¸
After the cranks 9 9' which move the tool are adjusted according to the desired
angle to which the teeth are to be planed, by means of the concentrically adjustable
pieces which are moved in their slots and then fixed by screws the work may
commence.
In the working of the machine, the supports cc' are caused to describe a recipro-
cating movement by means of the links on the rotation of the cranks g g².
The cross supports ffff which hold the tools and are connected with the
supports cc' by means of the supporting bars d d' and by the supports e e¹ e³ eª also
share in the said to and fro movement.
2
The supports and f³ also have, on their lower side, pins or guides y y
(Figures 1 and 3) which fit into templates z, these latter being each time adjusted
to suit the form of the teeth which are to be planed or cut. At each advance of
the supports towards the work by the action of the spindles the template
moves the supports e ele e³ and thereby the supports fƒ¹ƒƒ³ to correspond to the
curve or form of the teeth.
The supports ff¹ƒ ƒ³ (see Figure 6) are forced by means of a spring to move
towards the template z. When the machine has made a cut the ratchet wheels t
are turned by the pawls u u¹ as before described, and the tools are moved thereby
towards the work; the tool support whilst moving towards the work will descend
along the template and will thus be adjusted at each successive cut to suit the
required form of tooth.
The wheel to be planed or cut is held in front of the machine, and manipulated
by the same in the ordinary manner.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as cominunicated to
me by my foreign correspondent, I declare that what I claim is :-
1. An improved machine for planing or cutting the teeth of spur-wheels and the
like, which consists in the tool-holding supports ffff being moved by means of
cranks g g and links by two cog wheels which are arranged in two con-
centrically movable and (according to the angle or bevel of the teeth which are to
be planed or cut), adjustable cast pieces which hold the tools, substantially as
described and shown on the accompanying drawing.
2. In a planing machine for the purposes described, the combination of the cross
supports which are connected with the links hh, with the supporting bars a d³,
movable on centre pins, which supporting bars carry four smaller angle sup-
ports e e e e³, capable of moving to and fro on said bars, on which four supports

page_text: the tool holders, which may be moved by means of spindles r, are seated,
substantially as described and shown on the accompanying drawing.
3. In the machine described in Claims 1 and 2, the peculiar movement of the
tool holders fff2 f3 brought about by the spindles r of the same being provided
with cog wheels which engage with one another, and by ratchet wheels t being
seated on the spindles, in which wheels pawls u on a bare engage, so that, on the
supports cc moving to and fro, this bar » encounters pins a arranged on a
bar w¹, and thus, by means of the pawls u, move the ratchet wheel t and therewith
the spindles r, substantially as set forth.
4. In a machine such as described for cutting or planing the teeth of wheels, a
pin y on the chisel supports ff'ff, which pin is carried in a template = suited to
the form which the teeth, which are to be planed, are to have, in order thus
to force the tool-holder to make a movement suitable for the form of teeth required,
substantially as described.
Dated this 10th day of August 1894.
WM. P. THOMPSON & Co.,
Agents.