Improved Apparatus for Planing Bevel Toothed Wheels.
Year: 1898

page_text: TIONAL DE MOITICATION.
Improved Apparatus for Planing Bevel Toothed Wheels.
I, ERNST BACHMANN, of 4, Quillinplatz, X, Vienna, Austria, Engineer, do
hereby declare the nature of this invention to be as follows:-
.
This invention relates to improved apparatus for planing bevel toothed wheels
which is capable of being easily mounted on drilling and milling machines of
the vertical or horizontal type of construction, and which is characterized by the
fact that the guide bars (serving to guide the cutter carriages and being fixed
by means of ball journal bearings so as to be capable of movement in all direc-
tions) are connected to slide pins which are guided as by means of slotted plates
compulsorily along the tooth pattern and which are rendered capable of being
adjusted by means of a micrometer arrangement, provided with a scale for read-
ing off, in such a manner as to allow of using one and the same pattern for
toothed wheels having different numbers of teeth.
Figs. 1 to 5 of the accompanying drawings illustrate a horizontal apparatus
for planing bevel wheels in which
Fig. 1 is a side elevation and Fig. 2 is a front elevation of the apparatus, the
machine carrying the apparatus being indicated in broken lines. Fig. 3 is a
plan of the automatic feed mechanism.
Fig. 4 is an underside view of the bearing ends of the guide bars for the cutter
carriages and Fig. 5 is a vertical cross section through the guide bars.
Figs. 6, 7 and 8 are respectively a side elevation, front elevation and plan of a
vertically arranged planing apparatus.
The same reference letters indicate similar parts in the respective figures.
As shown, the frame A or part carrying the bevel wheel planing apparatus
is fixed to the framing of the existing drilling or milling machine B the rotat-
able spindle of which carries the crank driving or slot-disc C of the planing
apparatus. The adjustable slide block c of this crank disc carries the crank pin
for the connecting rods c which move to and fro the carriages E E that carry
the planing cutters e e and that slide along the guide bars D D. The planing
cutters are capable of being lifted up on the back or idle stroke, and they move
in paths or lines which always pass through the fixed adjusting point R.
The rear ends of the guiding bars are connected to the frame A by means of
ball journal bearings d d (Fig. 4) in such a manner as to be capable of move-
ment in all directions, whilst the front ends of the said bars are each connected
to one of the sliding pins dd¹, which latter are guided compulsorily along
the tooth pattern F that is fixed to the frame A, in order that the straight
bars DD, the carriages E E and their cutters e e can be capable of being
brought into the positions necessary for machining the various generating lines
of the tooth flanks. The device which shifts the sliding pins d along the tooth
pattern F consists of two plates G and H guided in the frame A, which plates
are provided with cross or angular slots g and h, respectively, through which

page_text: pass the sliding pins d¹ d'. The slot plate G is shifted after each side of a tooth
has been machined by means of an automatic feed mechanism, consisting, as
ordinarily of a ratchet mechanism K with screw-threaded spindle k. The slot
plate H which is loaded with a counterweight h¹ and which serves to exert a
counter pressure upon the sliding pins, follows automatically this movement,
so that the sliding pins are held at the crossing point of the two slots g and h,
and at the path of the pattern until a fresh adjustment of the slot plate g is
effected.
The aforesaid automatic feeding or ratchet mechanism K, whose movement
can be conveniently taken from one of the two cutter carriages E, as shown in
Fig. 6, is placed out of operation in the usual manner, after a tooth has been
completely planed and it begins its operation again when the toothed wheel is
adjusted for the next tooth to be machined. The two sliding pins di and d
may be shifted along the guide bars D, D, by means of the micrometer screw M,
that is to say, they can be moved nearer to or further away from cach other, so
that one and the same pattern F can be used for bevel wheels having different
numbers of teeth. A divided scale provided on the guide bars, D, D indicates
the proper position of the micrometer screw M for each number of teeth.
The planing length or the stroke of the cutters è, e may be varied by shift-
ing the slide block c, (which holds the connecting rods c¹) in the groove of the
crank disc C, whilst, by varying the length of the connecting rods, the cutter
carriages E E may be adjusted relatively to the adjusting point R for bevel
wheels of different sizes.
The bevel wheel to be planed is fixed upon the clamping head L (which is of
the usual construction) in such a manner that the axis of the bevel wheel will
pass through the adjusting point R.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
I, ERNST BACHMANN, of 4, Quillinplatz, X, Vienna, Austria, Engineer, 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 follow-
ing statement;-
This invention relates to improved apparatus for planing bevel toothed wheels
which are capable of being easily mounted on boring, drilling, and milling
machines of the vertical or horizontal type of construction, and in which the bars
that serve to guide the cutter carriages and are fixed by means of ball journal
bearings so that their outer ends can be moved towards and from each other
to a certain extent are connected with slide pins which are guided compulsorily
along the tooth pattern and are rendered capable of being adjusted by means
of micrometer arrangements, provided with scales for reading off, in such a
manner as to allow of using one and the same pattern for toothed wheels having
different numbers of teeth.
Figs. 1 to 5 inclusive of the drawings filed with my Provisional Specification
illustrate a horizontal apparatus for planing bevel wheels. Fig. I is a side
elevation and Fig. 2 a front elevation of the apparatus, the machine carrying the
apparatus being indicated in broken lines; Fig. 3 is a plan of the automatic
"

page_text: feed mechanism; Fig. 4 is an underside view of the bearing ends of the guide
bars for the cutter carriages; and Fig. 5 shows the guide bars in vertical cross
section.
Figs. 6, 7 and 8 are respectively an end elevation a front elevation, and a plan
of a vertically arranged planing apparatus.
.
The same reference letters indicate similar parts in the respective figures.
As shewn, the frame A or part carrying the bevel-wheel planing apparatus
is fixed to the framing of the existing drilling or milling machine B the rotating
spindle of which carries the slotted crank-disc C of the planing apparatus.
The adjustable slide block c of this crank-disc carries the crank-pin for the con-
necting rod c which moves to and fro the carriages E E that carry the planing
cutters ee and slide along the guide bars D D. The adjustable slide block c of
this crank-disc carries the crank pin for the connecting rod c¹ which is hinged
to a cross piece, Fig. 5, carrying on both sides pivots 3 journalled in eyes c of the
sliding carriage E; thus by turning the disc C the carriages E which carry the
planing cutters e e, will be moved to and fro and will slide along the guide
bars D, D. The planing cutters are capable of being lifted up on the back
or idle stroke and they move in paths or lines which should practically pass
through the adjusting point R.
The rear ends of the guide bars are connected to the frame A by means of
ball journals bearings d d, Fig. 4, in such a manner that their outer ends can
be moved towards and from each other to a certain extent. The front ends of
the said bars are each connected with one of two sliding pins d¹, d, which are
guided compulsorily along the tooth pattern F that is fixed to the frame A, in
order that the bars D D, the carriages E E, and their cutters e e may be brought
into the positions necessary for machining along the various generating lines
of the tooth flanks.
The ball bearings consist of two balls arranged on a spindle which is fixed to
the frame A and provided at its opposite end with the adjusting point R (see
Fig. 4) the two balls are arranged in suitable brasses consisting of two parts
screwed together, in each ball bearing one of these parts is connected by means
of an arm to the corresponding guide-bar D.
The device which shifts the sliding pins along the tooth pattern F, com-
prises two plates G and H which are guided in the frame A and are provided
respectively with angular slots 9 and h, which cross each other and in which
engage the sliding pins d¹ d¹. The slotted plate G is shifted, after each stroke,
by automatic feed mechanism of ordinary kind, comprising ratchet-mechanism K
provided with a screw-threaded spindle k.
The slotted plate H, which is provided with a counter-balancing weight h¹
and serves to exert a counter pressure upon the sliding pins, follows this move-
ment automatically, so that the sliding pins are held at the crossing place of
the two slots g and h, and in contact with the pattern, until a fresh adjustment
of the slotted plate G is effected.
The aforesaid automatic feed or ratchet mechanism K, whose movement can
be advantageously produced by one of the two cutter carriages E, as shown in
Fig. 6, is placed out of operation in the usual manner, after a tooth has been
completely planed, and it begins its operation again when the toothed wheel is
adjusted for the next tooth to be machined.
The two sliding pins d₁ d¹ can each be shifted on its guide-bars D, by means
of a micrometer screw of that is to say, the guide-bars D can be moved nearer
to or further away from each other, so that one and the same pattern F can be
used for bevel-wheels having different numbers of teeth. Divided scales pro-
vided on the guide-bars D D, indicate the proper position of the micrometer
screws M for each number of teeth.
The planing length or stroke of the cutters e, e may be varied by shifting the
slide-block c that holds the connecting rods c¹, in the groove of the crank-disc C,
whilst, by varying the length of the connecting rods, the cutter carriages E E

page_text: may be adjusted relatively to the adjusting point R for bevel-wheels of different
sizes.
The bevel-wheel to be planed is fixed upon the clamping head L (which is of
the usual construction) in such a manner that the apex of the bevel-wheel will
approximately coincide with the adjusting point R.
Since the deviation of the guide bars 1 diverging from their parallel position
can take place generally only within very small limits corresponding to the
different breadths of the teeth the lines or paths of the planing cutters will
always pass approximately through the fixed adjusting point R in any of the
practically possible positions of the guide bars relatively to each other. This
proximity to the adjusting point R is sufficient for any practical purposes, the
divergency of the bars D being no more than a few degrees when they are
adjusted from the smallest to the greatest tooth.
Having now particularly described and ascertained the nature of the said in-
vention, and in what manner the same is to be performed, 1 declare that what I
claim is:-
1. An apparatus for planing bevel toothed wheels adapted to be applied to
drilling and milling machines of the vertical or horizontal type, in which the
straight bars 1, D, which guide the cutter carriages E, E and are secured by
means of ball journal bearings d, d in such a manner as to be capable of move-
ment in all directions, are connected with sliding pins d, which are guided
compulsorily along the toothed pattern F by means of slotted plates G and H
and are mounted so as to be capable of adjustment by means of micrometer
screws M, provided with divided scales for reading off, in such a manner that
one and the same pattern can be employed for toothed wheels having different
numbers of teeth.
2. The improved apparatus for planing bevel toothed wheels constructed
arranged, and operating as herein before described with reference to and shown
respectively in Figs. 1 to 5 inclusive and in Figs. 6, 7 and 8 of the drawings
referred to.
1000
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.