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Патент USA US2406938

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Patented Sept. 3, 1946
Edgar L. Zehrbach, Lima, Ollio
Application October 7, 1943, Serial No. 505,284
2 Claims. (Cl'. 'f7-¿72)
This invention relates to reamers and particu
larly to reamers used in high precision Work.
An object is >to produce a new and improved
method of reaming by which the position yof the
tool is adjusted in a simple and convenient man
ner to control the size of the hole. This is par
ticularly important not only to secure accurate
results but also to increase the life of the reamer,
it being possible _to slightly adjustthe reamer after
it has been worn to such point that it cannot ream
a hole of the desired diameter, so that it will
thereafter ream. to the desired accuracy in spite
work W is formedv with a hole H to be reax‘ned.
As will be readily understood, rotary motion is
imparted to the work W during the reaming op
eration during which relative,> translatory move
ment between' the holder B and work
is im
parted. r"I'he reamer has a shank portion Ill', a
portion of thelforward end of which is fiuted as
indicated at I I to carry away the cuttings in the
usual manner. Ín advance of the fiuted portion
II and in `fixed relation thereto, is a cutting head
I2 formed with a suitable number of lands I3 ar
ranged in annular formation. Directly in rear of
the lands I3 is an inwardly tapered neck I4 merg
ci wear. "This accomplishes a two-fold result.
ing with the flutedportion I I. y
The life of the` reamer is greatly lengthened and
also accurate reaming can be effected at all times. 15 An important feature of the invention is in
the relatively narrow cutting head in rea-r of
Another object is to produce a simple and effi
which is a shank portion of substantially reduced
cientv method for reaming relatively small holes
The_length of the cutting head may
l diameter.
with greater uniform accuracy than has been pos
vary in accordance with the length of the hole
sible heretofore.l
A further object-is to produce a reaming method 20 toI be reame’d, the controlling factor being that
the angularity or eccentricity‘ of the reamer rela
which militates against the formation of the so
called bell mouth at one Or opposite ends of the
reamed hole.
tive to the axis of the hole to be reamed must in
no case be such ‘that the shank or fluted portion
‘of the reamer will engage the mouth or edge Dor
A still further object is to produce a new and
improved method of reaming holes of any pre 25 tion of the hole. In other words, with the parts
determined size within the range of the reamer
without changing in any way the form, configura
tion or structure of the tool itself but by a simplev
adjustment or alteration of the position of the Y
reamer Vrelative to the work.
O_ther objects and advantages `of the invention
will hereinafter appear, and for purposes of illus
tration but not of limitation, an embodiment of
the invention is shown on the accompanying
drawing in which`
Figure lis a bottom plan view partly in section
showing a lathe mounted reamer holder and
in the position-shown in Figure 2, the reamer
must be enabled to pass completely through the
hole H without the ilu'ted portion II or Shank' `I Il
engaging the mouth of the hole or that end ofthe
hole in lwhich the reamer is inserted. The reamer
shank may be cut away on one side to give a
greater angular adjustment if circumstances
make this necessary.
In operation it‘will be manifest thatthe' reamer
A can be moved in axial alignment with the hole
H as indicated in Figure 1 to effect the desired
reaming operation. Oftentimes it is not possible
to Obtain exact axial alignment. This oftentimes
reamer, with the latter axially aligned with the
is due to the lathe or other machine on which
hole in the work;
the reameris mounted because of Wear or inac
Figure 2 is a top plan View of the parts shown
curacies in the machine. In such cases, when the
in Figure 1, but with the reamer adjusted to'a
ordinary reamer is employed, bell-mouthed holes
position with its axis offset from or angularly
and particularly in precision Work, this is
disposed relative to the axis of the hole to be
most objectionable, and results in the scrapping
Figure 3 is aV view substantially on the line 45 of that part. Bell-mouthed holes can not be
reamed with the above described reamer »A be
3_3 of Figure 1;
cause even with the reamer A arranged out of
Figure 4 is a section substantially on the line
axial alignment' or eccentrically with respect to
4-4 of Figure 2; and
the hole to be reamed, there is no possibility of
Figure 5 is an enlarged fragmentary sectional
in View of the vshortness of the
View illustrating the operation of the reamer when
lands compared with the depth of the hole and
the same is disposed with the reamer axis eccen
the reduced diameter of the shank.
tric to the axis of the hole to be reamed.
It is found empirically that such eccentricity of
The illustrated embodiment of the invention
the reamer with respect to the axis of the hole
comprises a reamer A carried by a holder B, the
latter being suitably mounted on a lathe. The 55 to be reamed can be employed to greater advan
tage in the use of the reamer above described.
26 to receive suitable socket Wrench. On the rear
With the reamer disposed in the position such as
side of the plate I9 is a nut 2'I. The dial 25 is
indicated on Figures 2 and 5, the cutting action is
provided with suitable calibrations 28 which may
conñned to the areas C and C’ or what might be
be brought into registration with a suitable mark
termed the toe or front upper portion of the cut
formed on the plate I8 adjacent thereto.
ting lands and the heel or lower rearward portion
In practice a plug gauge will show the size of
(Figure 5). It Will be manifest that by varying
the holes being reamed. If it appears that the
the eccentricity or the oifset angular relation of
holes are too small, then it is necessary that
~the reamer with respect to the axis of the hole
angular adjustment of the reamer A be made.
to be reamed, the size of the reamed hole can be
This is effected by ñrst loosening the bolt 20 and
be varied. The amount of adjustment or eccen
then loosening the nut 21. Thereupon by the use
tricity is governed by the amount of angularity
of a socket wrench, the dial 25 can be adjusted
which can be imposed on the reamer without its
to the desired extent. For example, it may appear
shank engaging the sides of the hole.
that the reamed holes are one one-thousandth of
In practice this reamer may first be used in 15 an inch under size. In that event, the workman
axial alignment with the hole to be reamed.
will know that by adjusting the dial the proper
After a period of time, the reamer becomes worn
amount, the holes subsequently reamed will be
and the normal procedure so far as other reamers
one one-thousandth of an inch larger. There
are concerned, is to discard it. In this case, con
upon, by tightening the nut 21 and bolt 2I, the
tinued use of the reamer can be had by angularly 20 reaming operation can be continued. A pin 29
adjusting it as above mentioned so that the cut
in the plate I8 secures the reamer in place.
ting head does not enter the hole axially but
Although I have shown and described an em
eccentrically. By the usev of plug gauges, the
bodiment of the invention in connection with a
workmen can readily determine whether the hole
lathe, it is to be understood that the invention
is being reamed under size. In that event, adjust 25 can be embodied satisfactorily in a drill press
ment is made of the reamer an amount suñicient
where the reamer instead of the Work rotates, the
to compensate for the wear. Later on when iur
work remaining stationary. It is therefore to be
ther wear occurs and the gauge shows that the
understood that changes in details of construc
hole is again under size, a further angular ad
tion, arrangement and operation may be eiîected
justment of the reamer is eiîected and its use 30 without departing from the spirit of the invention
continued. It is found that such reamer can be
especially as deñned in the appended claims.
used over an extended period of time in an ex
What I claim is:
ceedingly satisfactory manner without sacrifice
l. The method of reaming which consists in
to accuracy of the reamed hole.
providing a reamer with a cutting head of sub
The holder B is designed to enable such angular 35 stantially less length than the depth of the hole
adjustment of the reamer to be readily and con
to be reamed and of less diameter than the diam
veniently eiiected. As shown, the holder has an
eter of such hole,r olïsetting angularly the axis of
outwardly extending barrel or chuck I5 into
the reamer relative to the axis of the hole an
which the inner end of the shank I0 lits loosely.
amount predetermined according to the desired
At the rear end of the barrel is a sleeve I6 which 40 size of the reamed hole, and imparting relative
receives the inner end of the shank I 0. A pair of
translatory and rotary movements between the
angularly disposed adjusting screws I‘I arranged
reamer and the work with the cutting head in
on the under side of the barrel are adapted to
such offset position.
engage the shank I0 which rests against them by
2. The method of reaming which consists in
gravity. The inner end of the barrel I5 is ñxed
providing a reamer with a cutting head of less
to a plate I8 which abuts against a plate I9 suit
diameter than the diameter of the hole to be
ably ñxed to the lathe. The plate I8 is pivotally
reamed and a reduced operating shank, angularly
mounted with respect to the plate I9 by a bolt
offsetting the axis of the cutting head with re
20 arranged at one side. The bolt 20 has a head
spect to the axis of the hole an amount prede
2I socketed to receive a wrench so that the plates 50 termined according to the desired sizeof the
can be loosened sufficiently to eiîect the desired
reamed hole and without the shank engaging the
adjustment.> On the other side of the barrel I5
sides of the hole during the remaining operation,
the plates are connected by a bolt 22 which has
and imparting relative translatory and rotary
an eccentric portion 23 disposed within an elon
movements between the reamer and the Work with
gate slot 24 in the plate I8. Fixed to the outer
the cutting head in such offset position,
end of the bolt 22 is a dial 25 formed with a socket
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