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Патент USA US2080089

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May 11, 1937.
Filed March 17, 1934
5 Sheets-Sheet 1
?J '
г~eewsqr Mb'mzacnse,
Mayll, 1937.
Filed March 17, 1934
3 Sheets-Sheet 2
3y: Mae/ah?!? , ?
May '11; 1937.
Filed March 17, 1934
3 Sheets-Sheet 3
г~згLaгkr "Jams/?CHER,
Patented May 11, 1937
2,030,089 l
Engelbert Miihlbacher, Los Angeles, Calif.
Application March 1'7, 1934, Serial No. 716,082
6 Claims. (Cl. 51-109)
This invention relates to devices used for ?nish
tering supports, such as roughly outlined at 20,
ing and re?nishing rounded surfaces, such as on may be applied at any suitable or required place
crank-pins and cams.
of the shaft, not in the least to interfere with
One of the objects of this invention is to main
the mechanisms of this apparatus.
tain the approximate position of the grinding
The actuating or controlling attachment, illus-? 5
wheel by cooperating guiding means contacting trated in Fig. 5, is of a type to be applied to one
with a surface in pairing relation to the surface ofa pair of crank-pins, to cooperate with the
upon which the grinding wheel is operating.
grinding attachment illustrated in Fig. 4.
Another object is to provide a simpli?ed?ar
The attachments of the type of Figs. 4 and 5
10 rangement for changing from one crank-pin to
depend for their proper cooperation upon the two 10
another or from one cam to another on the same
Another object is to provide for accurate ad
justments of the grinding wheel, making the ap
paratus economic and e?icient.
Other objects will appear from the following
description and appended claims as well as from
the accompanying drawings, in which- ?
Fig. 1 is a front elevation of a grinding ap
control-shafts 2| and 22, extending throughout
the whole length of the apparatus in front of the
main frame structure, as more clearly illustrated
in Fig. 2; in Figs. 4 and 5 the shafts 2| and 22 ap-_
pearing alone, in cross-section, while the main 15
frame structure is left off.
Any movement of the crank-pin, indicated in
Fig. 5 at 239. of the crank | 8, indicated in Figs.
1 and 2, is transmitted to the control-shafts 2|
paratus designed to operate according to this in
Fig. 2 is a fragmentary top plan view of the
apparatus illustrated in Fig. 1.
Fig. 3 is a fragmentary longitudinal mid-sec
anisms' illustrated in' Fig. 4.
tional view of one of the main operating shafts.
Fig. 4 is a fragmentary cr?oss?section on line
The control mechanisms include therefore a
control-arm? 24 provided with an adjustableend, 25
and 22 by means of the control attachment or
mechanisms illustrated in Fig. 5; ?and the move
ment received by the control-shafts 2| and 22 is
transmitted? to the grinding attachment or mech
4?-4 of Fig. 1, showing the grinding mechanisms
designed? to suitably engage the crank-pin 239.
in end-elevation.
by means of the contact-members 25 and 26,
Fig. 5 is a fragmentary cross section on line
?rmly provided on the arm 24, and another con
5?5 of Fig. 1, showing the control or guiding. tact-member 21 provided on the adjustable clamp 30
mechanisms in end-elevation.
28, whereby? a suitable??rm journal-connection
Fig. 6 is a fragmentary cross section similar to can be provided for the arm 24 with the crank
the illustrations of Figs. 4 and 5, in this case pin 23a, adjustable to suit di?erent crank-pins.
showing a slightly modi?ed form particularly ? The opposite end of the? arm 24 is pivotally con
adapted for use on cam-shafts.
nected'at? 29 to the lever 30, the lever? in turn be- 35
Though the principal mechanisms can easily ing'remova?bly mounted on the control-shaft 2|,
be applied to any common lathe or similar ma
the hinge-connection at 3| and the clamping con;
chine tool; as illustrated, however, the whole ap
nection at 32 serving for adjustments of the lever
paratus is arranged on a special frame structure, with respect ?to the control-shaft 2 I.
consisting in the main parts of the bed or cen?
?A link 33, at one end pivotally connected at?34 40
tral portion II, the leg-portions l2 and I3, and to the arm 24, and at the opposite end pivotally
the head-portions l4 and I5, indicated in Fig. 1.? connected at 35 to a second lever 36, which in turn
From a motor, not shown in the drawings, in is' adjustably mounted on the control-shaft 22,
the leg-portion 52, a belt i6 transmits the mo
serves to transmit motions of the crank-pin 23a, to
tion to head-pulleys IT, by means of which a
crank-shaft I8 may be rotated between points H
of the head-portions M and I5.
If the crank-pins of a crank-shaft are to be
?nished or re?nished, the main portions of the
crank~shaft are naturally well centered between
such points It, referred to above, and the different
crank-pins of the crank-shaft maintain a cer
tain relation to the central axis around which the
shaft rotates. -'
With especially long shafts any customary cen
the control-shaft 22.
From the illustration of Fig. 5, and also with
reference to the illustrations in Figs. 1' and? 2,
it will be understood that any rotating of the
shaft I8 between the points ,l9, and thereby any
swinging movements of the crank-pin 23a, results
in oscillatory turning movements of both of the
control-shaftsv 2| and 22.
1 j
These oscillatory turning movements are uti
lized for the proper operation of the grinding
mechanisms illustratedin Fig. 4.
In internal combustion engines, modern crank~
shafts customarily have crank-pins in pairing
relation, making it possible that the control
mechanisms can be applied to one of the pairing
crank-pins of a shaft, as at A, while the grinding
mechanisms are applied to another of the pair
ing crank-pins of the same shaft, as at B, in
Figs. 1 and 2.
Under this consideration, it must be under
stood that the di?erent levers and arms and con
nections of? the control-mechanisms of Fig. 5 as
well as of the grinding-mechanisms can be so
designed that the grinding-wheel 3?! is just in a
position to always follow the crank-pin 23b ac
the lever 36a, on the shaft 22 can be made to fol
low any movements of the lever 300. on the shaft
2| when operated by the pin 41.
In Fig. 3, a fragmentary detail slightly en
larged illustration shows a simple and advanta
geous construction of the shaft 2|.
A slightly modi?ed form of control mechanisms
is illustrated in Fig. 6.
The lever 30b is held in a
rigid position by the link 49, so that the shaft 22 0
alone is free for oscillatory turning movements.
This form is particularly suited for cam-shafts,
of which a cross section is indicated at 50, the
grinding wheel indicated at 31 eventually to be
cording to the pairing crank-pins 23a position,
on the same type of grinding mechanisms as
controlling the movements of the control-mech
illustrated in Fig. 4, in Fig. 6 being merely indi
anisms, whereby the grinding-mechanisms are
cated in dotted lines to illustrate a grinding of
a cam opposite to the cam responsible for the
movements of the control mechanisms of this
so maintained as to bring the grinding-wheel to
the proper relation to the crank-pin 23b operated
ing means as indicated at 48 in Fig. 5, whereby
upon by the grinding-mechanisms.
It may be said that the position of the grind
ing mechanisms is only approximately following
the crank-pin 23b, but that is su??lcient, and that
is exactly as it is desired.
For the sake of assuring accurate movements
The arm 2% is provided with a number of holes
5| by which a link 52 is adjustably and pivotally
connected at 53 with one end, the opposite end
of the link 52 being pivotally connected at 54
to an adjustable contact-arm 55.
in the grinding mechanisms with respect to the
A bracket 56 mounted on the bed or central
particular pin, or cam, or surface, distinct ad
justments are provided directly on the grinding
mechanisms. The link 33a is provided with an
adjustment 38 whereby the contact-end 39 can
portion | | of the main structure embodies a pivot
51 on which the contact-arm is adjustably mount
ed for swinging movements, the bearing-blocks
58 and 59 being shiftably mounted in the con
tact-arm 55 controllable by the adjusting means
60 and 6|.
be varied with respect to the crank-pin 23b, for
direct or positive contact as well as for spacing
Regardless, however, of whether the contact
35 ing end 39 is used as a direct guiding means for
the grinding-mechanisms, or not, a separate ad
justing mechanism, indicated at 4|], serves to
bring the grinding-wheel 31 into operative posi
tion with respect to the crank-pin 23b.
Assuming ?the arm 24a, is following closely the
movements of the arm 24 of the control-mecha
nisms of Fig. 5, and also assuming that levers 36a
and 30a, of the grinding mechanisms are rather
accurate duplicates of the levers 36 and 3!) of
45 the control-mechanisms of Fig. 5, a base 4| with
a balancing weight 42 is provided mounted on
the pivot 29a adjustable by the adjustment 40
so as to vary the position of the grinding-wheel
3.?! nevertheless.
This arrangement makes it possible that the
?so grinding
wheel can be adjusted to a position to
assure any desired accurateness.
Adjusting the arm 249. so as to contact the
end 39 with the crank-pin 23b, to be operated
55 upon, the adjustment ?40 can be controlled so
that the space between the contacting end 39
and the grinding wheel 31 is just the desired dis
tance equaling the thickness of the crank-pin
wanted in the finished pin or re?nished pin.
The grinding mechanisms must then be said
to be held approximately, though really rather
accurately, to follow the crank-pin 23b, accord
ing to the movements of ?the crank-pin 233., by
means of the control-mechanisms, and, in addi
65 tion, be guided by the adjustable guiding facili
ties directly on the grinding mechanisms.
The upper parts ?43 of the grinding mecha
nisms are furthermore adjustable with respect to
the base 4| by ?means of the spindle and han
dle '44.
The whole grinding mechanisms can also be
Of course, this modi?ed attachment can also
be used for larger strokes than customarily ex
ist on cam?shafts, a proper operation merely '
depending on a proper proportioning of the sev
eral levers, easily arranged by any mechanic.
Furthermore, such an attachment can be de
signed to function on oppositely disposed cams
or cranks as well as on pairing cams and cranks, ~10
the tilting contact-arm 55 being readily used for
oppositely disposed surfaces, while the arm 24b
is then just as easily applied to pairing surfaces,
in the manner described above.
From the detail illustration of the shaft 2| ..
it will be clear that the gear-rack 45 is mounted
in the shaft 2 I, which in turn is turnably mount
ed on an inner shaft 53, a bearing sleeve 62
serving to assure a proper wearing of the bear
ing surface, making an exchange of wearing sur 50
faces easy, the whole being held in place by the
set rings 64, such arrangement, of course being
provided on the opposite ends of the shaft 2|.
Having thus described my invention, I claim:
1. In a grinder, an operating structure in- -
eluding supports by which a crank shaft can
be rotated around its central axis, a control
mechanism designed to follow the movements
of a crank of the crank-shaft, operating shafts
disposed alongside of said structure with their
axes parallel to the ?rst-named axis, the control
mechanism including means for imparting oscil
latory rotating movements to the operating
shafts, a grinding mechanism in operative con
nection with said operating shafts and thereby
with said control mechanism, adjusting means
on the control-mechanism for setting the con
trol-mechanism on said operating shafts with
respect to said crank-shaft, other adjusting
means for holding the control-mechanism snugly
to a crank of the shaft, other adjusting means on
adjusted along the oscillatory shaft 2| by means
the grinding mechanism for setting the grind
of ?the gear-?rack 45 on the shaft 2| and the gear
ing mechanism on the operating shafts for co
'46 in the-lever 30a, controllable by the pin 41,
operation with said control-mechanism, contact
the lever 369. being ?provided with similar clamp
means on the grinding mechanism for contact
ing with a crank of the shaft, further adjusting
means for contacting the grinding mechanism
with the crank, and still further adjusting means
for the grinding \mechanism transversely to the
operating shafts, the grinding mechanism in
cluding an actuating and an actuated portion
pivotally connected, and a balancing means for
the grinding mechanism.
2. In a grinder, a contact-arm having a pivot
support at one end and means to contact with
the side of a crank-pin at the opposite end, a
grinder base designed to support a motor and
a grinding Wheel and having means to pivotally
connect with the contact arm, and a counter
balance on the base for balancing the base with
motor and grinding wheel on the arm.
3. In a grinder, a contact-arm having a pivot
support at one end and means to contact with
the sideof a crank-pin or cam at the opposite
20 end, a grinder base designed to pivotally rest
on the arm and having means for siidingly sup
porting the grinder proper, the grinder proper
being adjustable transversely to the axis of the
4. In a grinder, a control-mechanism for use
on cam-shafts comprising a control-arm with a
pivot-support at one end and actuated means at
a distance from the pivot-support, the contro1~
arm having various connections spaced differ
to said connections, blocks siidingly mounted in
the contact-arm in pairs with the adjoining faces
designed to engage a pivot-support, and adjust
ing means for the blocks for varying the oppo
sitely disposed lever-ends with respect to said
adjoining faces.
5. In a grinder, a control-mechanism for ?use
on crank-shafts comp-rising a control-arm with
a pivot-support at one end and actuated means
at a distance from the pivot-support for control 10
ling the movements of the arm with respect to
the pivot-support, the control-arm having con
tact means to siidingly engage against the sides
of crank-pin at the opposite end with respect
to the ?rst-named end, and a clamping member
having contact-means to adjustably cooperate
with the ?rst-named contact means for holding
the outermost end of the control-arm in con
tacting engagement with the crank-pin.
6. In a control mechanism for grinders of the =
class described, a control-arm having a pivot
support at one end and a contacting means? at
the opposite end designed to siidingly engage
against the sides of a part to be ground, the
arm having an actuating pivot intermediate the
two ends, and a clamping member adjustably
mounted on the second-named end and having
contacting means to adjustably co-operate with
the ?rst-named contacting means.
30 ently from the pivot-support, a contact-arm
having means at one end adjustably connected
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