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Патент USA US2137690

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Nov. 22, 1938.
2,137,690
H. w. KROPF
GRINDING WHEEL DRESSER
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Filed Aug. 15. 1938
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Nov. 22, 1938.
2,137,690
H. W. KROPF
GRINDING WHEEL DRESSER
Filed- Aug. 15, 1938
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2 Sheets-Sheet 2
Patented Nov. 22,- _1938
. ' 42,137,6s5m -
UNITE-o STATES PATENT oi-‘Fics
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Henry W. Kropf, 'Muskegon Heights, Mich., as
" signor to Brlckner-Kropf Machine Company,
Muskegon Heights, Mich., a corporation ot
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Michigan
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Application'August 1Q, 1938, Seria‘i No. 224,888
_s cnims.- (ci. 12s-1_1)
This invention relates tc grinding wheel dress
ers, and is concerned with the production fof a
dresser for grinding wheels whereby the wheel
may be .dressed to a form having an irregular
s face. That is, the periphery of theigrinding wheel
which comes against and-contacts the metal to
be ground may have an irregular shape given to
it transversely of its face to reproduce on a part
to be ground such irregular face in relief or the
10 opposite. One example is a grinding wheel ‘with
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a continuous concave groove around its periph
eral face betweén -the sides of the wheel >which
on the work will produce a corresponding con
to which the face of a grinding_whee1 is-to be
dressed,- but it is to be understood that the rear
edge oi' the template may have many other
shapes and is designed as to the shape selected
in'accordance with the form and configuration 5
that the peripheral grinding face of the grinding
wheel is to take. ` .At the upper side o1 the bar 3
a block 8 with a passage at'the underside thereof
from front to rear is either integrally formed or
is secured to said bar 3 for the purpose of at- A10
taching a dust guard 8 which extends upwardly
and to. the rear at an angle to the vertical, the‘ _
lower end portion thereof being narrowed in width '
vex rib'asillustrated in Fig. 4. It is an object ‘ and turned horizontally as at I0 for entrance into ’
1l and purpose of my. invention to provide a novel , the rectangular passage at the lower side of the 15
and eilicient means and oney which is simple to part I and over the bar-3.
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construct and" reliable in use for dressing wheels
A combined carrier for the dressing or cutting
of the character stated or many other forms than diamond and holder for a' feeler to engage the
the concaved groove mentioned as `an example. e edge of the template is used. It comprises a- base
Anunderstanding of the invention andthe op
‘eration thereof. may be had from the following
-description, taken in connection with the ac
companying drawings, in which:
Fig. 1 is a side elevation with a part in section
25 showing the dressing tool of my invention.
"Fig, 2 is a vertical section on the plane of the~
line 2_2 of Fig. 1, looking in the direction indi
cated by the arrows.
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Fig. 3 is a partial plan and horizontal section,
,o the post holding the dressing diamond being
shown in section.
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" Fig. 4 is a plan v_iew of a portion of the wheel
which has been Vdressed in operative/position
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II from which a vertical post I2 extends up-_ 20 ,
wardly, at the upper end of which is a horizontal
sleeve I3, in the iront end of which a ‘holder It
for a diamond cutter l5 may be releasably se
cured; 'I'he head oi' the-holder il, as shown in _
the drawings is of conical form but it may take 25
other shapes, as will be later described.
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- At the upper side and front- portion of the
base I a feeler i6 having a forwardly projecting
tape
portion I'I, the angular relation of the'
sides of which are the same as the angular rela- 30
tions of the sides of the head of the holder Il,
is clamped upon a raised section I8 having a fiat
horizontal upper face by- means of a clamping
screw Il.-- The screw i9 passes through an open
35 L_ike reference characters refer toiike parts .ing or slot in the feelerl member IS, permitting 35
in the different figures of the drawings.
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adjustment ofthe feeler member which must
In the construction illustrated in the drawings, beJocated' directly below the diamond holder `I4
a supporting or base plate i, preferably of cast with the pointed end oi' the tapered section I1
iron or `mild steel, at one end thereof hasa trans-i -‘ directly below and in the samev vertical plane
4%’ verse bar 2 secured at the upper side of the plaie, 'with the point of the diamond cutter ~I 5, land with»- 40
above and lengthwise of which is asecond bar 3 the angular sides of the part I'I in inclined planes
- which may be termed a,~ clamping bar and which coincidentzwith the planes oi’ the sides of the
against a part to be ground.
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is clamped against the bar 2 by clamping screws '
i, one at each end of the bar 3, as shown. The
45 bar 2 may be secured to the base plate I by screws
conical holder
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` In dressing the grinding wheel 20, the base I `
may be placedupon a magnetic chuck indicated 45
indicated“ in dotted outline 5 in Fig. 1„ passing o at 2l, located properly with respect to the grind
upwardly through the base plate I and threading ing wheeland then magnetically held by the
into the bar at 2. The bar at 2 is preferably of chuck through turning on the electric current.
non-magnetic material for a reasonwhich will The center of the `diamond radius I5 must be in
50 hereinafter be-stated. _
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-line with the axis -of the grinding wheel aboutl 50
-T'he` clamping bar l is used to clamp _a template which the wheel turns. The base II at least, of
5 between it andthe bar 2. _Such template 8 the diamond and feeler holder and carrier, is of
is anat plate, at the rear edge of which appears non-magnetic- material whereby it may be freely
a'concavedrecess 'I.` Such'recess ‘l is for the moved over the plate I without being afïected by
55 purpose of showing -one example of the form
e Vmagnetic chuck. ‘Ihe ' point of the .iront 55
2,137,690
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portion I1 of the feeler I6 is brought against
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of the ñrst base member in any direction, a post
the rear edge of the template 6 and the post I2 » extending upwardly from said second base, a hori
zontally located dressing tool holder carried by
and plate Il operated by the hands of the op
erator and with the feeler held against the-rear said post and ‘extending in a forward direction,
edge of the template 6, may be used to dress the a dressing tool carried by said holder, having a
head vwith a dressing point at the front end
peripheral face of the grinding wheel 20 to pro
thereof, a feeler adjustably mounted at the upper
duce on the face of the grinding wheel a con
formity with the rear edge of the template. side of said second base member having a pointed
Various other forms than the groove indicated front end portion, the end of which is in direct , .10
'vertical alinement with the front end of the
10 at 1 may be used in the’rear edge off the tem
dressing tool and having sides corresponding to
plate to produce corresponding peripheral pat
terns around the peripheral grinding face of the - the sides of said dressing tool, said feeler at its
grinding wheel. 'I'he dust from the grinding forward end being adapted to follow the con
wheel is carried downwardly to the dust guard 9, tour'at the rear edge of said template, as speci
fied.
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15 de?lecting the same forward. The non-magnetic
- 3. Apparatus for shaping grinding wheels to a
' character of the bar 2 is also to avoid any mag
netizing effects upon the template 6" frorn the desired contour comprising, a supporting base
_magnetic chuck 2l on which the tool may be having a fiat upper side, said base being of mag
placed and held. >Of course, vwhen the tool is netic attractivelmaterial, a bar secured across 20
one end of the base and above the same, said
20 held some other way than magnetically, it‘makes
little difference that the bar 2 or the part i! bar being of non-magnetic material, a feeler plate
should be of non-magnetic material, but in most of sheet metal adjustably clamped at the upper ‘
cases the dressing tool will be used in' conjunc-A
tion with a magnetic chuck.
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'I'he diamond may have any radii or may have
a knife edge. 'I'his will not alter the working
25
of the >device providing the feeler is shaped to the
same outline. „ With a dressing tool or device
made in accordance with my invention, it is pos
sible to grind duplicate contours, previously here
tofore considered a, substantial mechanical im
possibility. The grinding wheel may be very
readily dressed to a desired or selected contour
by providing a template in accordance there
35 with. The dust guard protects the template and
the feeler from grit or dust cut from the grinding
wheel which might come between the two and re
sult in abrasion.
The invention- is of a very practical and use
ful nature. It is defined in the appended claims
side of the bar and having a rear edge shaped to
a preselected contour, a >dressing tool and feeler
carrying member including a base of non-mag 25
netic attractive material, the underside of which
is iiat and is adapted to be moved over the upper
side of the first named base in any direction
that it may be moved, a wheel dressing tool car
ried on and above said second base, said 'tool be 30"
ing pointed in a forward direction, a feeler ad
justably mounted at the upper side of said sec
ond base pointed in the same direction as the
dressing tool and havingA its foremost point in
direct vertical alinement with the foremost point
of the-dressing tool and having its side contours
in conformity with the side contours of the dress
ing tool, said feeler being adapted to .be held
againstl the template and moved therealong to
and is lto be considered comprehensive of all
forms of structure coming within the scope of said
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claims.
I claim:
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l. Apparatus for shaping grinding wheels to a
desired contour comprising, a' base member, a
follow the contour thereof, as specified.
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4. Apparatus for shaping grinding wheels to a
desired contour comprising, a supporting base
member of magnet- attractive ymaterial adapting
the same to be connected with and held upon
a magneticchuck, a template carried by and at
the front side of said base, means for mounting
ytemplate -mounted thereon having a predeter
mined contour at one edge to be reproduced in
the peripheral face of a grinding wheel, a mem
ber having a base adapted to be moved horizon
said template on> the base including a member
of non-magnetic material between said base
and template, said-template at its rear edge hav
ing a contour preselected as the contour to which
ing implement connected with and located above
said second base, a dressing 'implement carried
rier located above said base back of the tem
plate including a lower base member of non
magnetic material having a horizontal under sur
face to move freely over the upper surface of
the first base member, a dressing toolcarried on
and above saidsecond base member pointed in a
tally over the upper side of the first. mentioned , the peripheral surface of the grinding wheel
is to be dressed, a dressing, tool and feeler car
base in any direction, a holder for a wheel dress
by said holder, said wheel dressing implement be
55 ing adapted to be pointed toward and located
in the same horizontal plane with the axis about
which the grinding wheel to be dressed rotates,
and a feeler mounted on said second base adapt-'
60 ed tof be brought against the contour edge of saidl
template, said feeler having a feeler contact point
in direct vertical alinement with. the point of said ‘
dressing implement, and having sides correspond
ing to the sides- of said- dressing implement, as
andfor the purposesspeciñed.
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2. Apparatus for shaping the peripheral face
of a grinding wheel to a desired contour com
forward direction, said dressing tool including
a conical head and a dressing terminal point at
the apex thereof, and a feeler adiustably mount
ed at the upper side and front portion of the
second base member comprising a ñat horizontal
plate having a pointed forward portion. with Lta-- 65
pered sides, the point of the apex` of which is
in direct vertical alinement with the point of, said
prising,'a'base member, having a fiat upper side, ` terminal dressing point, and the sides of said
" a template secured. at the forward end and above tapered portion being in planes coincident with
said base member, said template being positioned’ ~ the horizontal sides of said conical‘head, .as
v substantially horizontal and having its rear edge
specified.
shapedin accordance with a desired contour to
-be given .to-a grinding wheel, a member includ
ing a base structure having a iiat under’ side
75 >adapted to be moved slidably over the upper side
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5. A construction containing the elements 'in
combinationdefined in claim 4, and ~agguard. lo
cated abovev and extending upwardly'and rear
wardly over said template-and. feeler and below 7_5
2,137,690 '
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said second base, a Wheel dressing implement se
cured in said holder adapted to be pointed to
6. Apparatus for shaping grindlngwheels to a` ward and have its dressing end lie in the same
horizontal plane with the axis about which the
desired contour comprising, a base member hav
ing a flat horizontal upper side, a horizontally grinding wheel to be dressed rotates, and a feeler
disposed template mounted on and above said mounted on said second base in substantially the
base at one end thereof having an edge shaped same horizontal plane with said template, said
to preselected contour which extends over the feeler having a free end to bear against the tem
base member, a member having a base with a plate and follow the contour thereof, the point 10 flat under side adapted to rest upon and move , of engagement of the feeler with the template be-_ 10
over the upper side of the ñrst mentioned base lng in direct vertical alinement with the outer
in any direction, a holder for a wheel dressing most point of the dressing implement.
HENRY W. KROPF. ’
implement connected with and located above
the dressing tool, as and for the purposes speci
iìed.
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