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Патент USA US2124757

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July’ 26, 1938.
w_ VAUGHAN‘
2,124,757
PISTON RING GROOVE CLEANER
Filed June 1, 1956
fswém
INVENTOR.
W'ILLIAM‘ VAUGHAN
F76- _ 6
-
BY
Caz/own m
ATTORNEYS
Patented July 26, 1938
2,124,757
UNITED STATES PATENT OFFI€E
2,124,757
PISTON RING GROOVE CLEANER
William Vaughan, Lapeer, Mich., assignor of one
half to Aircraft Specialties, Inc., Lapeer, Mich.,
a corporation of Delaware
Application June 1, 1936, Serial No. 82,964
3 Claims.
The present invention relates to piston ring
groove tools and has particular reference to that
type of tool which is adapted to be used for both
removing incrustations of carbon and deepening
Cl
the normal depth of the grooves.
An important object of the invention is to
provide a device of the foregoing type which is
of simple and durable construction and which
can be manufactured very inexpensively on a
10 large commercial scale by modern mass produc
tion methods.
Another object of equal importance is to pro
vide a device of the foregoing type having a rel
atively low maintenance cost.
The invention contemplates certain features
of construction, combinations and arrangements
of elements novel to this art whereby certain im
portant and well-de?ned advantages are ob
tained. Among said advantages may be men
tioned the following:
The device is readily adjustable to operate
on pistons of widely varying diameters.
The device is readily adjustable to clean or
deepen grooves of different widths.
The cutter element is pressed against the
groove with uniform working pressure, thus pro
viding a non-gouging and non-chattering action
such as is essential in order to obtain a smooth
and clean surface.
7
and inoperative positions relative to- the piston
to be operated upon, the parts in their inoper
ative position being indicated by dot and dash
lines;
Figure 2 is a plan view corresponding to Fig
ure 1;
Figure 3 is a cross-section taken on line 3—3
of Figure 1;
Figure 4 is a cross-section taken on line 4-4
of Figure 1;
of Figure 1;
Figure 6 is a View in perspective of the spring
for urging the tool holder toward the forward
end of the device;
Figure 7 is a view in perspective of the cutter
element and the screw for pivotally mounting
it upon the tool holder; and
Figure 8 is a view in perspective of the locking
means for the cutter element.
a thin bar I of substantially rectangular cross
section. The forward end 2 of the bar is bent
back upon itself as shown to provide means for
engaging pistons of different diameters at two
spaced points. The main portion of the bar is
straight to provide a guide for the slidable mem
ber 3 as well as a convenient handle 4 for the
sideways is totally eliminated, thus entirely ob
tangular cross-section and serves a purpose to be
hereinafter pointed out. The portion 1 is U
shaped in cross-section and as will be hereinafter
pointed out serves as a mounting for the tool
holder. The slidable member 3 may advanta
geously be made out of a single blank, the rivets
8 serving to hold the formed blank together.
Means may be provided to lock the slidable
member against movement at any desired point
along the main portion of the bar I. The means
The number of exposed or protruding cutter
teeth is reduced to a minimum.
' The cutter element is readily removable for
resharpening or replacement.
The tendency of the operative cutting tooth
to drop into the oil holes is entirely eliminated.
Other objects and advantages will appear as
the description proceeds.
The inventive concept underlying the inven
tion is adapted to be embodied in various physi
50 cal forms, one of which is illustrated in the ac
companying drawing.
Referring briefly to the drawing,
Figure 1 is an elevation of the illustrative em
bodiment of the invention, showing the cutter
55 element and its associated parts in both operative
20
Referring now to the drawing in greater de
tail, it will be noted that the device comprises
device.
grooves or cutting the bottom of the grooves at
an angle.
10
Figure 5 is a cross-section taken on line 5-—5
Proper cutter pressure is readily and automati
cally obtained, regardless of the diameter of the
piston upon which the device is being used.
Additional cutter pressure may be very easily
obtained.
The tendency of the cutter element to swing
viating the danger of damaging the side of the
40
(01. 82-4)
30
The slidable member 3 consists of a lower por
tion 5 which is of hollow rectangular cross-sec
tion to‘ serve as a guide-way to enable the mem
ber to slide along the bar I, and the two upper
portions 6 and l. The portion 6 is of hollow rec
may consist of a slot 9 in one side of the slidable
member and a screw II] which is threadably con
nected to the side of the bar I through the slot
9. The screw has the milled head I I, the screw
thread l2 and the enlarged shank 13. When I
the screw is tightened, the annular shoulder be
tween the shank l3 and the threads l2 presses
against the edges of the slot 9 and clamps the
slidable member against movement.
The tool holder is designated as I4 and is piv 55
2,124,757
2
otally mounted by means of the pivot pin I5 at
the forward end of the U-shaped portion 1 of the
slidable element 3. The tool holder comprises the
two spaced walls I6 and I1 and the connecting
wall l8, and is normally urged about its pivotal
point toward the forward end of the tool by means
of the spring IS. The holder may advantageously
be made out of a single blank of suitable material.
The spring I9 which is shown separately in Fig
10 ure 6 is formed of a thin strip of resilient metal
and has the slightly arched main portion 20 and
the bent back portion 2|. The bent back portion
diameters. The cutter element 24 is turned about
its pivot to present the required sized cutter tooth
toward the piston and the cutter element is locked
in position. The slidable element is moved toward
the piston until the operative tooth is received
within the groove to be operated upon. Then the
slidable element is locked in position by means of
the screw H].
To operate the device it is merely
necessary to turn the piston against the cutter
or to rotate the device around the piston. The 10
construction of the device is such that the cutter
element is pressed against the groove with uni
form working pressure, proper cutter pressure be
ing automatically obtained regardless of the di
ameter of the piston. Additional cutting pressure 15
may be readily supplied if considered necessary
terminates in the small upwardly facing recess
22. As shown in Figure l the spring I9 is disposed
15 with its main portion 20 lyingv on the floor of the
two portions 6 and 1 of the slidable member 3,
the bent back portion 2| being bent about the ' or desirable by exerting a slight pressure upon
pivot pin l5 and the recess 22 engaging the bot— the connecting wall I8 of the tool holder with
tom of the connecting wall l8 of the tool holder. the thumb of the hand used to hold the device.
It is thought to be clear that the manner in
20 It will be noted that the two upper portions 6 and
‘I of the slidable member serve asta housing for which the cutter element is mounted entirely
eliminates any tendency of the cutter element to
the spring_
'
Rotatively mounted on the upper end of the swing sideways. Hence, the danger of damaging
tool holder about a horizontal axis by means of the side of the grooves or cutting the bottoms of
the screw 23 is the cutter element 24'. These two the grooves at an angle is entirely eliminated. It
elements are shown separately in Figure 7. The is also to be noted that the operative cutter tooth
passes readily over the oil holes instead of drop
cutter element has a hub 25 which may advan
tageously be of cylindrical form, and‘ is provided ping into them as in prior devices.
The foregoing embodies the essential and dis
with a plurality of. cutter teeth 26, 2'1, 28 and 29
tinctive thought of my invention, but it will, of ~
30 of different thicknesses to adapt the tool for use
with grooves of different. thicknesses. As clearly course, be understood that the same may be com
shown in Figure 1 any one of the cutter teeth bined with other features without affecting the
may be brought into operative. relationship to the peculiar results obtained and that various changes
piston P which is disposed at the bent end 2' of and modi?cations may be resorted to as to details
the bar I. The piston engaging portions of the without departing from the spirit and scope of
my invention.
bar enter into the groove to be cleaned and coop
I claim:
erate with the operative cutter tooth- to clamp
1. A piston ring groove cleaner and deepener
the piston in position. After the desired tooth is
brought into operative positionv the cutter element comprising a straight bar bent back upon itself
may be locked against‘ movement by tightening at one end to provide means for engaging pistons
40
the screw 23.
'
'
of widely varying diameters at two spaced points,
itive locking means for the cutter element. The
locking means 30 is separately shown in Figure
a cutter element mounted on said bar for both
slidable and pivotal movement to and away from
the bent end of said bar and spring means urging
said cutter element about its pivotal point toward
8 as consisting of a solid block of metal of rec
the bent end of said bar.
In the illustrative embodiment of the invention
the device is shown as being provided with a pos
'
tangular cross-section having a curved upper
2. A piston ring groove cleaner and deepener
portion 3|, a cut off corner 32 and a screw thread
comprising a straight bar bent back upon itself
at one end to provide means for engaging pistons
of widely varying diameters at two spaced points, ;
ed aperture 33‘. The block 36 is adapted for slid
able movement between the two walls [6 and ll of
the tool holder 14 and. may be moved up in the
space between two teeth of the cutter element to
lock the cutter element against rotative move
ment. In order that the block may be easily
moved to and from locking position the wall‘ 16 is
provided with a slot 34 to receive a screw 35 which
a slidable member mounted on said bar for move
ment toward and away from the bent end of said
bar, a cutter element, means for mounting said
cutter element on said slidable member for piv
otal movement toward and away from the bent
end of said bar and spring means for urging said
into locking position by means of the screw 35
cutter element about its pivotal point toward the
bent end of said bar.
3. A piston ring groove cleaner and deepener
comprising a straight bar bent back upon itself 3
at one end to provide means for engaging pistons
and then locked against displacement by tighten
of widely varying diameters at two spaced points,
is threadably connected with the block 30 by
means of its aperture 33. The screw is of substan
tially the same form and construction as the screw
l0 previously described. The block may be moved
ing the screw.
It is thought that the operation of the device
will be readily understood from the drawing and
the foregoing description. Suffice it to say that
the piston P to be operated upon is positioned as
shown in Figures 1 and 2 with the two piston
engaging portions of the bar I engaging in the
groove to be cleaned or deepened. Obviously the
70 bent end 2 will receive pistons of widely Varying
a tool holder mounted on said bar for both slid
able and pivotal movement to and away from the
bent end of said bar and a cutter element pro
vided with a plurality of cutter teeth and rotat
ably mounted on said tool holder so as to present
any desired one of said teeth in operative rela
tion to the piston.
WILLIAM VAUGHAN.
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