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Патент USA US2136565

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Nov. 15, 1938.
‘ E. w, RCBERTS, JR‘
Filed June ‘26, 1934
Patented Nov. 15, 1938
Edmund W. Roberts, Jr., Cincinnati, Ohio
Application June 26, 1934, Serial No. 732,498
1 Claim. (Cl. 131—13)
My invention relates to reamers for cleaning
the bowls of tobacco pipes by cutting, from the
interior of the pipe bowl, accumulations of cinder
and similar matter. One object of my invention
(Tl is to provide a device which
simple and of a
size and form convenient to be carried in the
pocket. A second. object is to‘ provide a tool
which'will clean out a pipe bo-wl e?ectually with
the minimum of effort.
In processing my invention, I so form the
outline or contour of the blade that it will sub
stantially approximate the contour of a longi
tudinal cross-section of a pipe-bowl interior.
Along the edges of the blade I provide a series
. 15 of notches evenly spaced, such that the metal
between the notches is formed into a series of
cutting teeth. I so arrange the teeth on one
edge of the blade that they are opposite the
notches on the opposite edge of the blade. I so
20 indent the face of the blade where it adjoins the
corners of the teeth, that in so doing the metal
is forced outward providing a top rake to the
teeth and an angle between the edges and the
face of the blade greater than a right-angle, thus
2 providing a side rake to the teeth.
In the ?gures:
Fig. 1 shows the flat side of the reamer.
Fig. 2 is a section along line 2—-2 of Fig. 1.
Fig. 3 illustrates the reamer in use. The ream
30 er is shown held in the hand while thrust into
the bowl of a tobacco pipe and in the process of
being rotated to ream the accumulation from
the interior of the bowl. The pipe bowl is in
section, the section being taken along-a plane
passing through the center of the bowl and the
center of the pipe stem.
In the ?gures, the shank or blade of the reamer
is designated by the numeral 1, and the grip by 8.
Along the edges of the blade are provided the
notches 9, preferably of semi-circular contour.
40 The formation of the notches provides the teeth
ll] between them. The end ll of shank l is
rounded to conform apiproximatelyto the contour
of the bottom of a pipe bowl. The faces of teeth
[0 and end II are provided with indentations
l2, l2’.
Indentations l2, l2’ are so positioned on the
opposite faces of shank ‘i that they are on the
leading faces of the teeth Ill when the reamer
is turned clockwise as viewed from the grip 8.
Indentations l2, [2' are located just within edges. 10
13 of teeth Hi.
In Fig. 3, the pipe bowl is designated by the
numeral I4, the stem of the pipe by l5 and the
hand of the user by I6.
In the operation of the reamer, it is thrust 15
into the bowl of the pipe to be cleaned as shown
in Fig. 3, and rotated while being pressed toward
the bottom of the pipe bowl. The cutting edges
remove the accumulation in a very few turns of
the blade. The staggered relationship of the
teeth avoid grooving the interior of the bowl.
The general shape of the teeth and especially
the sharp edges and the clearances provided by
the indentations permit the reaming to be ac
complished with very little effort. Since the
majority of smokers prefer to permit a portion 25
of the accumulated cinder to remain, in order to
keep the pipe “sweet”, the reamer is made slightly
smaller than the interior of the average pipe
I claim:
A pipe cleaner comprising a metal plate having
the edges thereof formed with teeth, the outer
free edges of the teeth being in a line de?ning
substantially a parabolic curve, each tooth having
one face thereof flat, and the opposite face there 35
of formed with a recess, the teeth on opposite
edges of the plate having their respective recesses
facing in opposite directions.
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