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Патент USA US2408723

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Oct. 8, 1946'.
'
A.‘ ANDERSON
2,408,722
APPARATUS FOR.FORMING CAM SURFACES UPON CYLINDRICAL CAM BODIES
' ' Filed April 7, 1945
2 Sheets-v-Sheet I
w.mmA
Oct. s, 1946.
1 2,408,722
A. ANDERSON
APPARATUS FOR FORMING CAM SURFACES UPON CYLINDRICAL CAMRBOIDIES
Filed April 7, 1945
2‘ Sheets-Sheet 2
Q-
BY
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INVENTOR.
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2,408,722
' Patented Oct. 8, 1946
UNITEDg STATES ‘ ‘PATENT OFFICE I .;
APPARATUS FOR FORMING CAM SURFACES.
UPON CYLINDRICAL CAMBODIES
Application
Arthur April
Anderson,
7, 1945,
Brooklyn,
Serial No.
N. 587{,126_
V1 Claim.l (cur-101)
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shown). The grinding machine It further com
prises, a- vertically-adjustable supporting bed. l3
toapparatus for forming ' '
My inventionrelates
a cam surface upon a cam body of the cylindrical
type and, more particularly, to a device adapted ‘
to be used as an attachment fora grinder, or the
whichiissuitably secured to the frame 10a and
carries a work. table M which is movable'both
longitudinally and transversely with respect to
the horizontal. axis H of grinding wheel l2. As
shown bestin Fig. 2, the work table I4 is provided
like .metal removing machines, so as to convert
the grinder intorapparatus especially useful in
re?nishing worn cams.
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with transversely-extending T. slots “at; Thus
I It ‘is an object of the invention to provide a
far, I have 'referredto-pertinent features of a
ing acylindrical cam body to a cutting tool for 10 typical well-known surface grinder. 'It'is to be
understood, however, that I do not limit myself to
forming a camv surface having a desired degree
the particular type of grinding machine shown
of rise for a given arcuate length.
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as the invention is applicableto various types of
. It is‘a furtheriobject of the invention to pro
grinding machines or evenin its broader, aspects,
vide apparatus capable of using a given master
cam or template for. operating upon a plurality 15 to planing orvv milling machine aswill more fully
appear hereinafter.
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of- cams of different sizes to- produce the same
} According to the present preferred form of the
rise per degree of circumference as that of th
invention, a split pillow block l5 comprising, a .
master cam or. template. ,
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lower section Mia and an upper section -_l5b is
_ Itis a vfurtherobject of the invention to.pro-.
simple device for accurately positioning and feed
,vide a sturdy, low-cost! device “which may .be
readily attached to andused in conjunction with
a grinding machine, milling cutter, planingrna
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chine, or the like for forming a cam surface on
a cylindrical cam. ‘
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, It is a further object of the invention to pro
rigidly secured to the work table 14 by means of
T bolts I50, I50 the heads of which aredisposed
withinone of the slotslllla, The upperlsection
15b of the pillow block I5 is clampedto the lower
section He by bolts I511, l5d thus de?ning: a tu
bular bore in which is rigidly held a. cylindrical
extension [6a of a supporting base |6., To assure
vide adevice for forming cam surfaces upon re
spective cam bodies of, various sizes, bothyas to
the unitary rigidity of the base l6 and block‘ IS,
diameter, thickness of face and extent of rise.
Other objects, advantages and features of the
invention will become apparentfrom the follow
'ing detailed description taken in conjunction with
screwed upwardly, through the lower block section
_-I5a and into engagement with the cylindrical
a flush headset ‘screw ,(not. shown) preierably is
portion “3a. The “base or gbottomi?ange of the
lower pillow blockmember Ilia is provided with
alower surface disposed in a plane at ‘right angles
to the'aXis .V, and accordingly when thesdevice is
the
V Fig.
appendeddrawings,
l is a frontelevational
in which:
view showing
.. my
novel device as adapted more especially for oper
ation with a grinding machine;v . ,
.held' in position on a horizontal bed such as H
the, axis V is vertical. Carried by the-base I6 is
a cylindrical stub shaft ll, the axis .Vgof which
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Fig. 2 is aside view of the device shown in
Fig. l;
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is vertical at all times. For conveniencethe shaft
I‘! is madeas a separate member snugly seated
Fig, 3 is a top view of the device as shown in
Fig. 2‘ with certain parts of the grinder omitted
for clarity;
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40 in a bore in the base’ l6 and rigidly locked thereto
Fig. 4 is a sectional view, taken along the line
4-.-4 of Fig. 2, with certain parts broken away;
and ‘
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Fig. 5 is an enlarged sectional view taken along
the line 545 of Fig. 3, and showing the grinding ‘
wheel which is omitted in Fig- 3.
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by a screw [61).
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A collar IB encircles the cylindrical member l1
and is supported by the base It for removably
holdings master cylindrical cam or ‘template IS.
The template-His rigidly held on the collar 18
by'screWs'lSa; [9b and one‘ of thesescrewssuch
as lBb, extends throughlthe. collar'litand en
gages the cylindrical member IT to thereby rig
idly secure the template to the shaft-11- while
_ Referring more particularly to Figs. land 2,
I have shown, as one form of a cutting machine,
a grinding machine I 0 of conventional form. com
prising a frame Illa providing a, journal having a 50 permitting ready» adjustment of the template
removable cap lob suitably secured thereto as by
angularly.
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As is apparent from Fig.4, the template 19
has a substantially vsemi-circular con?guration.
However, the angular extent of- the template l9
cured thereto for rotation about ‘its horizontal
axis H by any vsuitablegsourceof, poweririot 5-5 may vary from a portion .of ‘.a quadrant, to _ .360
bolts I00, I00 and serving to rotatably support a
shaft ll having a grinding wheel l2 suitably.se
2,408,722
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degrees, depending upon the arcuate extent of
the cam surface to be formed, without departing
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cam body 2| by increments, only a small portion
being ground away at each cut. However, under
some conditions, the whole width of the upper
from the spirit and scope of the invention. The
template I!) has an inclined upper surface S, Fig.
surface of cam 2| may be ground away at one
1, the lowest portion thereof being at S1 and the in cut.
highest portion at S2. For convenience, a hori
The supporting table l3, Fig. 2, is then verti
zontal plane P, P passing through S1 may be con
cally adjusted to give the desired depth of out
sidered as a reference plane. Those skilled in the
art will recognize that the “rise” at any portion
which is kept as shallow as possible to conserve
the metal of the cam surface. Preferably, the
of the upper cam surface S is its vertical distance
cam 2| is rotated to such a position during this
above the horizontal plane P‘, P and the Vertical
distance of the upper cam surface S from the
plane P, P at S2 is the total rise of the cam.
operation that the grinding wheel l2 does not
engage the surface of cam 2|.
The grinding wheel I2 is then rotated at a high
Similarly, the rise per degree of circumference
rate of speed and the work carrier 20 together
of the template i9 is the difference in elevation
with the cam 2| are rotated by the handle 20f,
of two points upon the cam surface S which are
for example, in a clockwise direction, Fig. 3. As
separated by an angular distance of one degree.
the highest portion T of the upper surface of
Rotatably mounted upon the cylindrical mem
cam 2.| comes into engagement with the grind
ber I1 is a work carrier 20 having a horizontally
ing wheel I 2, the roller 20b is in engagement with
extending stub-shaft 20a, Fig. 2, upon which is 20 a relatively low portion, for example S1, of the
journalled a roller 20?) engaging the upper sur
upper surface S of template I 9, Fig. 1. As rota
face S of template IS. The work carrier 20 is
tion of the work'carrier 20 continues through an
movable axially with respect to the cylindrical
angle of one degree, for example, the roller 20b
member [1, this axial motion being controlled by
travels along the upper surface S of template
the height or rise of the upper surface S of the 25 l9 whereby the work carrier 20 together with the
master cam IS. The upper portion 200 of the
cam 2| moves vertically upward with respect to
work carrier 20, Figs. 2 and 4, is circular and
the grinding wheel I2 a distance equal to the
has a ?ange 20d upon which is carried the base
rise per degree of the template l9. Accordingly,
2|a_ of a cylindrical cam body 2| which is to be
as the cam 2| is rotated, the vertical distance D,
provided with the proper contour as determined
Fig. 5, of the newly-ground surface N of cam 2|
by the shape of the template IS. The cam 2| is
from the base 2|a thereof decreases in accord
?rmly secured to the work carrier 20 in any
ance with the rise of template l9. As the cam
suitable manner as, for example, by screws 2|b,
2| is rotated through an angle of one degree, for
2 lb, the center of the cam 2| being disposed upon
example, the distance D decreases a distance
the axis of rotation of the work carrier 20. While
equal to the rise per degree of circumference of
the invention is intended especially for the re
the template I9. Rotation of the work carrier
grinding of worn cams it is within the contem
20 is continued until the whole circular length of
plation of the invention that it may be used to
the upper surface of cam 2| has been ground
initially cut or form a new cam surface in which
away, the newly-ground cam surface N thus hav
case the cam body 2| takes the form of a suitable 40 ing the same rise per degree of circtunference as
cam blank. The work carrier 20 is provided with
the template l9. a handle 20)‘ by which it may be rotated about
The work table | 4 together With the cam 2|
the cylindrical member l'l. Thus, as best shown
are moved to the right, Figs. 2 vand 5, and an
by Fig. 1, it will be apparent that, as the work
other portion of the cam surface of the cam 2|
carrier 20 is rotated, the roller 2% moves along 45 is ground away‘by rotation of the Work carrier
over the upper surface S of the master cam IS
20 together with the cam 2| by the handle 20)‘.
with the result that the work carrier 20 moves
This adjustment of the work table I4 and grind
vertically in accordance with the degree of rise
ing are continued until the whole width of the
of the upper surface S of cam I19‘. In other words,
surface of cam 2| has been ground. In this man
as the work carrier 20 together with the roller 60 ner, I obtain. a reground cam surface having the
20b is rotated through an angle of one degree,
same rise per degree of circumference as the
for example, said work carrier 20 moves a ver
template l9, and ‘the ?nished surface is ac
tical distance equal to the rise per degree of cir
curately horizontal in a radial direction through
cumference of the template Hi. It will be appar
out its arcuate length. Also a smooth ground
ent that cams of any desired diameter or thick
?nish is provided, not obtained by any other
ness or height may be resurfaced or cut by choos
method, consequently prolonging the life of the
ing a suitable work carrier 20', the upper portion
200 and ?ange 20d of which conform to the inner‘
and lower surfaces, respectively, of the cam body
2|.
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Operation
Referring to Fig. 2, with the parts assembled
as previously described, the Work table I4 is
moved transversely with respect to the axis H of
grinding wheel l2 until the vertical axis V of the
cylindrical member H, on which the centers of
the template l9 and cam body 2| are disposed,
intersects the horizontal axis H of the grinding
wheel l2. The work table I4 is then moved lon
gitudinally with respect to the axis H until the
grinding wheel I2 is in position to make a cut
of the desired width upon the cam body 2|, Fig.
5. ‘Thus, it will be apparent that I prefer to
grind away'the Worn or rough surface of the
cam.
It will be obvious to those skilled in the art
that the grinding wheel |2_ could be replaced
by a milling cutter or a planing tool without
departing from the spirit and scope ofthe broader
aspects of my invention. Therefore, it is to be
understood that the term “metal removing tool”
in the appended claims is descriptive of a grind
ing wheel, milling cutter, planing tool, and the
like.
It will further be apparent that while the
invention is intended especially for use in re
?nishing cylindrical cams of the type used in
single and multiple automatic screw machines,
the surface of the template | 9 could be of a
different or irregular contour, if it is desired to
provide a cam whose active surface is of such
different or irregular shape.
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,While the invention has been described with
respect to a presently preferred embodiment
’ 2,408,722
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which has given satisfactory results, and certain
> apparatus of a detachable ?xture including a
modi?cations have been referred to, it will be
understood by those skilled in the art, after
, base rigidly secured to said table and providing
understanding the invention,_that various other
changes and modi?cations may be made with
out departing from the spirit and scope ofthe
invention and it is intended, therefore, in the
appended claim to cover all such changes and
modi?cations as fall within the scope of the in
vention.
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a vertically extending. cylindrical portion. con
structed and arranged for the insertion there
over of a surrounding arcuate template, said
base also providing a cylindrical bearing portion
' having a vertical axis of rotation coincident with
the axis of said arcuate template, said detachable
?xture also including a Work carrier journaled
~10 on said‘ base for movement radially and longi
tudinally of said vertical axis, said work carrier
comprising a cylindrical portion concentric with
said vertical axis for rigidly holding a cam body
Wheel for forming a cam surface wherein a Work
on the outer periphery thereof, and a template
table is movable in a direction normal to the
axis of said grinding wheel, said Workvtable being 15 follower securedto said carrier for engagement
with said template.
adjustable longitudinally and transversely with
ARTHUR ANDERSON,
respect .to said axis, the combination with said
Iclaim:
,
In apparatus comprising a rotatable grinding
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