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Патент USA US2117637

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May 17, 1938.
2,117,637
c. E. WALLING
CIRCULAR RELIEF GRINDER
Filsd Sept. 5, 1955
2 Sheets-Sheet l
INVENTOR
CLYDE E- WHLLING
BY
cgwuw- QATTORNEY
May 17,‘ 1938-
c. E. WALLING
2,117,637
CIRCULAR RELIEF GRINDER
Filed Sept. 5, 1935
2 Sheets-Sheet 2
15
INVENTOR
. CLYDE
E- WELL/N5
BY
QYMA-M. 6L. ATTOR
Watt.Y _
Patented May 117, 1938
2,117,637
UNITED STATES PATENT OFFICE
2,117,637
‘
CIRCULAR RELIEF GRINDER
Clyde E. Walling, Lakewood, Ohio
Application September 5, 1935, Serial No. 39,322 “
2 Claims.
This invention relates in general to metal
working machines and more particularly to
grinding machines for sharpening milling cutters,
hobs, reamers, taps and so forth. Grinding ma
5 chines of this type embody a vertically rotatable
wheel adapted to be swung around a vertical
axis, so as to permit of spiral tools, such as cut
ters, taps and reamers being sharpened between
the centres of the machine. However lip or lead
l0 angles on tools can be ground with machines of
(CI. 51-95)
bodiment of the invention is hereinafter shown
with reference to the drawings accompanying
and forming a part of this speci?cation.
In the drawings:
Figure l is an end elevation of a grinding ma
chine embodying the invention.
Figure 2 is a front elevation of the grinding
machine shown in Figure 1.
Figure 3 is an enlarged fragmentary sectional
view partly in elevation of the machine shown in 10
Figure 1, the section being taken on line 3—-3 of
Figure 2, and
this type only, by laterally offsetting the axis of
the respective tool with respect to the cutting sur
Figure 4 is a cross sectional view on line 4-6
face of the grinding wheel and then the lip or
lead angle is proportionate to the offsetting of of Figure 3.
the axis of the tool and also proportionate to the ‘ In the drawings the grinding machine is
v mounted on a suitably constructed stand I, which
diameter of the tool.
The above described method of grinding lip stand vertically adjustably supports a bed 2 by
or lead angles on tools by offsetting its axis with means of brackets 3. The bed 2, which is verti
respect to the grinding surface of the grinding cally shiftable by means of a threaded shaft 4
:10 wheel is complicated and inefficient and does not and gearing 5, operated by a hand wheel 6, sup 20
permit to properly grind tapered or taper spiral ports a slide l, longitudinally slidably arranged
tools, such as spiral cutters, spiral taper reamers, on said bed. The slide 1 is longitudinally moved
taper spiral hobs etc., as the outside contour of upon the bed 2 by suitable means, such as a rack
bar 8 and gear 9, which gear is rotated by a shaft
such tools is distorted during grinding opera
tions.
It has been proposed to overcome the
above described de?ciency in grinding tapered or
tapered spiral tools by swinging the wheel head on
grinding machines of the type referred to around
an axis inclined toward the vertical, so that the
wheel, when set square with the main slide of a
grinding machine is inclined to the vertical at a
de?nite angle of clearance. However such in
clined mounting of the grinding head limits the
use of grinding machines thus equipped and ef
fects a change in the size of the lip angle on
straight tools proportionate to their diameter
and on spiral tools proportionate to their diam
eter and the pitch of the spiral.
It is the general object of this invention to pro
40 vide a grinding machine which permits of proper
grinding of all tools, including tapered straight
or spirally fluted tools etc., with any desired pre
determinable clearance or lip angle. This de
sideratum according to the invention is attained
45 by the provision of means for tilting the grinding
head of a grinding machine in a vertical plane,
so as to permit of the cutting face of the grinding
wheel being set to any desired inclined position
with respect to the centres of the grinding ma
50 chine.
With this and incidental objects in view, the
invention consists in certain novel features of
construction and combination of parts, the es
sential elements of which are set ‘forth in the
55 appended claims; and a preferred form of em
in having a hand wheel ll attached to its outer 25
end.
A pair of lengthwise adjustable centers l2 and
M, one being ?xed and the other being vertically
adjustable are supported on the slide ‘l and per
mit of ‘axial mounting of a tool below a grinding 30
wheel l5. ‘This wheel is secured to a horizontally
disposed spindle l6, journaled in a head I‘! and
will properly grind a tool supported between the
centres l2 and it, when the tool is traversed
with the slide 1 on the bed 2. The spindle i6 is
coupled with a motor l8 by means of a pulley
drive 19 and the motor I8 is mounted on a brack
et 20, which bracket laterally extends from the
head ll. An adjustably mounted tool dresser 2!
permits of proper shaping or dressing of the
wheel IS.
The wheel head i'l consists of a wheel support
ing part 22 and an inverted cup-shaped base
part 23, which base part tiltably mounts the
wheel supporting part 22. The base part 23 ex
tends with its vertical ?ange 24 into the recessed
top 25 of the stand l and rests thereupon by
means of a circumferential shoulder portion 26.
The top plate 21 of the base part 23 is radially
recessed on an arc in a vertical plane, so as to
provide a curved recessed seat 28 for the down
wardly extended leg portion 29 of the wheel sup
porting part 22. This leg portion embodies two
legs 30, which are integrally connected at their,
2
2,117,037
lower ends by means of a curved plate 3!. The
plate 3! slidably rests upon the seat 28 and per
mits of the part 22 being tilted in a vertical plane
with respect to the part 23. A slot 32 in plate
claim is:
3i, arranged ‘radially with respect to the curve
l. A grinding machine embodying in combina
of said plate, and a central bore 33 in the re
cessed seat 28 of the base part 23 permit of the
tion a standard, a horizontal slide supported by
parts being tiltably clamped to each other by
means of a bolt 34. This bolt engages with its
head portion 35 a perforated integral cross piece
36 within the stand I and thus secures parts 22
and 23 to the stand, when the nut 31 resting ‘upon
a curved washer 38, ?tting the curvature of the
plate 3|, is screwed home.
When it is desired to set the head ll and there
with the grinding wheel i5 for a particular job,
_ the nut 31 is slightly loosened so that‘ the base
said standard, work supporting means adjustably .
secured to said slide, a grinding wheel shaft, and
a supporting head for said grinding wheel shaft,
said supporting head embodying a circular base
horizontally rotatably secured to said standard,
a bearing means for said grinding shaft and in
tegral supporting means for said bearing means
intersecting the axis of rotation of said base,
said supporting means tiltably securing said 15
bearing means to said base to effect in every
tion by common means, such as a worm drive, as
adjusted position of said base tilting of said bear
ing means and grinding shaft in a plane through
the longitudinal axis of said shaft and the axis
generally practiced and therefore not shown. The
of rotation of said base.
setting of the head can be read on a scale 38,
which scale indicates the horizontal angle of head
ill with respect to the axis between the centres of
2. A grinding machine as described in claim 1,
wherein said horizontally rotatable base portion
part 23 can be axially rotated to the desired posi
the grinding machine.
Then the wheel support
ing part 22 is tilted to the desired angle which can
be effected either manually or by any common
means, all as well known in the art. The tilting
of the wheel supporting part 22 with respect
to the horizontal can readily be read on a scale
39. When all adjustments are made the nut
35 is again tightened and the machine is ready for
operation.
t:
by a double ?nger indicator" secured to the stand
i of the machine.
Having thus described my invention, whatJ
.
Preferably the two scales 38 and 39 are ar
ranged at the same side of the machine and exact
readings on the scales can readily be indicated
_
20
of said supporting head embodies an axial bore
and is recessed to form a curved seat, wherein
said bearing means for said grinding wheel shaft 25
is provided with a downwardly extended, curved
portion slotted substantially parallel to said shaft
and slidably rested upon the curved seat of said
base portion, and wherein a single clamping
means secured to said standard is axially extend 30
ed through the bore of said base portion and the
slot in said bearing means for rigidly securing
said base portion and said bearing means jointly
to said standard.
CLYDE E. WALLING.
35
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