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Патент USA US3037411

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June 5, 1962
I
s. E. REES
3,037,401
SELF-ALIGNING ATTACHMENT FOR COUNTERSINKING APPARATUS
Filed April 6, 1959
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BY
!
ATTORNEY
June 5, 1962
3,037,401
S. E. REES
SELF-ALIGNING ATTACHMENT FOR COUNTERSINKING APPARATUS
Filed April 6, 1959
2 Sheets-Sheet 2
43
INVENTOR.
\f?ro/oJ/?xre E. Reed
BY
ATTORNEY
3,037,401
Patented June 5, 1962 "
1
2
The preferred method of attaching the self equalizing
3,037,461
SELF-ALHGNTL‘JG ATTACHMENT FGR
CGUNTIERdlNlGNG APTARATUd
Shropshire E. Rees, Houston, Tex., assignor to Reed
Roller Bit Company, Houston, Tex., a corporation of
Texas
Filed Apr. 6, 1959, Ser. No. 894,307
4 Qiairns. (Cl. 77--2)
device to the apparatus involves two small changes to be
made within the front end portion D of the apparatus,
which changes are clearly shown in the accompanying
drawings. One change consists of enlarging the opening
813 of only one of the three foot pieces 77, and providing
this enlarged opening with an internal screw thread 10. A
plug 11 is then screwed into the opening ~83‘ to close the
lower end of the cylinder 78. This plug is provided with
This invention relates generally to a portable apparatus 10 a central bore 12 through which the piston guide rod 32
adapted to countersink, counterbore or spotface holes in
of the patent is free to slide. The seal ‘84 of the patent is,
metal sheet or plate, but more particularly to a self
in this instance, carried by the plug 11 around the piston
equalizing device adapted to be secured to the front end
rod 82 and an additional seal 13 is provided between the
plug 11 and the inner wall of the cylinder 78.
The second change to be made consists of extending one
of the three coil spring recesses 87 through the cylindrical
shaped ‘body 75 ‘and providing the lower end of this ex
of such apparatus and intended to maintain the apparatus
and its cutting tool in axial alignment with the hole, there
by assuring concentric relationship between the hole and
its countersink, coun-terbore or spotface.
One object of this invention is to provide such an ap
paratus with a self equalizing or leveling attachment en
abling the countersinking, counterboring ‘or spotfacing of
tended recess with internal screw threads 14. A plug 15
is then screwed in this extended recess to close the recess
and afford a seat ‘for one end of the coil spring 86. In
order for the self equalizing device about to be described
to perform adequately, it is important that the one of the
three spring recesses 87, which is to be changed as above
Another object of this invention is to provide a self
described, be diametrically opposed to the one of the
three cylinders 78‘ equipped with the plug 11 above de
equalizing device for the front end of such a tool having
work engaging faces radially spaced from the cutting tool N) 5 scribed.
and affording purchase to prevent such drift or walking
Referring now more particularly to the invention, the
plug 11 has a nipple 16 screwed therein and provided with
of the cutting ‘tool which may result from unequal cutting
a hole to be aligned or concentric with the hole regardless
of the contour or unevenness of the surface of the sheet
or work on which ‘the apparatus is applied.
of the tool.
Another object of this invention is to provide such an
a central cylindrical recess 17 affording clearance for the
relatively small area on the face of the work.
cylindrical head 20 from which extends a lug 21 equiv
alent in size and shape to the lug 19. The lugs 19 and 21
alford supporting means for the self equalizing device,
which comprises a ?rst ring like member 22 surrounding
the rotary cutting tool A which projects from the front
end of the apparatus. This ?rst ring is laterally spaced
from. the cutter A and is provided with two diametrically
opposed elongated slots 23 and 24 (FIG. 5), in which are
piston guide rod 82. This nipple is formed with the usual
apparatus with a shield surrounding the cutting tool, OH O hexagonal head 18 from which extends a lug 19 of rec
thereby causing the cutting chips to be retained within a
tangular cross section. The plug 15 is provided with a
Another object of this invention is to provide a self
aligning attachment especially applicable for use with a
countersinking apparatus of the type described in the
United States Patent No. 2,669,887 of February 23, 1954.
Other objects and advantages will be further brought
out in the following description, wherein:
FIG. 1 is a side elevational view, partly in section of
the device embodying the invention.
loosely ?tted the lugs 19 and 21 respectively, which lugs
FIG. 2 is a view similar to FIG. 1 but illustrating parts
are connected to the ?rst ring by a cross pin 25 carried by
in different positions.
FIG. 3 is a longitudinal View, partly in section, taken
the lug 19 and extending radially through the body of the
on line 3--‘3 in FIG. 1.
FIG. 4 is a cross sectional view taken on line 4--4 in
21 and extending similarly through the ring 22. Thus
FIG. 3 looking in the direction of the arrows.
‘FIG. 5 is a cross sectional view taken on line 5—5 in
FIG. 3 looking in the direction of the arrows.
ring, and a second coaxial cross pin 26 carried by the lug
it will be understood that the ‘first ring 22 is mounted on
the front end of the countersinking apparatus for pivotal
movement on an axis 28 which is perpendicular to the
The self aligning device about to be described is pri
longitudinal center axis of the apparatus. In order to
normally maintain the upper ring 22 perpendicular to the
marily intended as an attachment for the front end of the
longitudinal central axis of the countersinking apparatus,
countersinking apparatus shown and described in the
United States Patent No. 2,669,887 of February 23, 1954,
and for better understanding of its function and opera
tion, reference should be made to that patent.
the side of the ring adjacent to the front end of the ap
paratus is provided with two cylindrical recesses 29 located
one on each side and equidistant from the pivotal axis 28
and each accommodating a compression spring 30' which
projects therefrom against the front end of the apparatus.
Fixed to the interior of the ring '22 by solder or the like,
is a shield in the form of a sleeve 31 which is flush with
It is to be understood that this invention is restricted to
a self equalizing device preferably secured to the front
end of an apparatus of the type described in the afore
said patent, portions of which apparatus are shown in the
the right face of the ring but projects beyond the left
face thereof a predetermined extent. As clearly shown
accompanying drawings only to illustrate a preferred
method of attaching the device to the apparatus. Since 60 in FIG. 1 this cylindrical shield is laterally spaced from
the apparatus does not form a part of this invention, the
portions thereof shown in the drawings will not be de
scribed in detail but have been assigned reference numer
als corresponding to those used in the patent.
the cutting tool A. In addition to the slots 23 and 24 the
ring 22 is provided with two similar slots 32 and 33 which
extend through the ring and are located at right angles
from the slots 23 and 24.
3,037,401
4
cause the free end of the shield to be located close to the
A second ring 34 is located to the left of the ?rst ring in
coaxial alignment therewith. This second ring is pro
surface of the work, thereby isolating the self aligning
vided with two lugs 35 and 36 of rectangular cross section
device from the cutting chips, grime and the like incidental
to the cutting operation, as well as causing the cutting
which projects into the slots 32 and 33 respectively of the
?rst ring 22 where they are pivotally connected thereto
by two coaxial pins 37 and 38 which pins extend radially
through the ?rst ring and the lugs 35 and 36. Thus it will
chips to be retained within a relatively small area on the
surface of the work, from which they can readily be
removed after the removal of the apparatus from the
work.
be understood that the second ring 34 is connected to the
Although the foregoing description is necessarily of a
?rst ring 22 for pivotal movement on an axis 40 perpen
dicular to the axis 28 and located Within the same per 10 detailed character in order to completely set forth the in
pendicular plane relative to the longitudinal central axis
of the countersinking apparatus. In order to normally
maintain the two rings 22 and 34 substantially parallel,
the face of the ?rst ring 22 adjacent to the second ring 34
is provided with four cylindrical recesses 41 each ac
vention, it is to be understood that the speci?c terminology
is not intended to be restrictive or con?ning, and it is to
be further understood that various rearrangement of parts
and modi?cations of structural details may be resorted to
15 without departing from the scope or spirit of the invention
as claimed.
commodating a compression spring 42 which engages the
I claim:
adjacent face of the second ring 34, thus the springs 42
1. A self aligning attachment for a countersinking ap
tend to maintain the ring 34 parallel to the ring 22 and
paratus and the like including a housing having a rotary
also prevent free pivotal movement of the ring 34 on
its axis 40. The face of the second ring 34 remote from 20 cutting tool mounted thereon, comprising a ?rst member
and a second member surrounding said tool in coaxial
the ring 22 is provided with three raised foot pads 43
relationship therewith, said ?rst member connected to
which project slightly from that face of the ring, and are
said housing for pivotal movement on a ?rst axis, means
equally spaced and intended to engage the work during
connecting said second member to said ?rst member for
operation of the countersinking apparatus. Preferably
these foot pads extend radially to the outer edge of the 25 pivotal movement on a second axis perpendicular to said
?rst axis, said ?rst and second axes located with a single
ring. The inner diameter of the second ring 34 is sub
plane perpendicular to the longitudinal center axis of said
stantially larger than the outside diameter of the cylindri
tool, work contacting means on said second member, and
cal shield 31, thereby enabling pivotal movement of the
a sleeve like shield surrounding said tool carried by said
second ring relative to the ?rst ring without interference
from the shield 31, which shield extends through the 30 ?rst member and extending therefrom through said second
member, said shield being externally spaced from said tool
second ring but ends short of the raised foot pads 43.
and internally spaced from said second member.
When the self equalizing device above described is at
2. A self-aligning attachment for a countersinking ap
tached to the front end of the countersinking apparatus in
paratus including a housing having a rotary cutting tool
the manner above set forth, and the apparatus is applied
mounted on the lower portion thereof, comprising a ?rst
to a work piece such as a metal sheet or plate having a
ring-like member surrounding said tool in spaced rela
hole therethrough which the apparatus is to countersink,
tionship therewith, means connecting said ?rst ring to said
counterbore or spotface, it will be understood that since
housing for pivotal movement on a ?rst axis perpendicu~
the work contacting ring 34 is adapted to pivot on two
cross axes 28 and 49, the apparatus can readily be main
lar to the longitudinal center axis of said tool, a work en
tained in axial alignment with the hole to be countersunk, 40 gaging second ring-like member disposed in coaxial re
lationship with said tool and axially spaced from said
counterbored or spotted. As illustrated in FIGS. 1 and 2,
?rst ring, means connecting said second ring to said ?rst
in the event the face of the Work is not perpendicular to
ring for pivotal movement on a second axis perpendicular
the axis of the hole, the self equalizing device will ?rst
engage the work in the manner shown in FIG. 1, with the
rings 22 and 34 gradually pivoting on the pivot axes Z8
and 40 as the countersinking operation takes place to
assume the position in FIG. 2 at the conclusion of the
countersinking operation. In other words, by providing
to said ?rst axis, said first and second means spaced an
equal distance from the longitudinal center axis of said
tool.
3. A self-aligning attachment for a countersinking ap
paratus and the like including a housing having a rotary
cutting tool mounted on the lower portion thereof, com
the front end of the countersinking apparatus with a work
engaging device adapted to swivel on two axes perpendicu 50 prising a ?rst member and a second member disposed in
spaced planar relation with one another along the median
lar to each other, the apparatus can readily be maintained
axis of said tool, said members surrounding said tool in
in axial alignment with the hole to be countersunk without
interference from the front end of the apparatus engaging
an uneven or non-perpendicular surface of the work
spaced and coaxial relationship therewith, said ?rst mem
ber connected to the lower end of said housing for pivotal
piece. Since in the type of apparatus described in the 55 movement on a ?rst axis, means connecting said second
member to said ?rst member on a second axis perpendicu
aforesaid patent for which this self equalizing device is
intended as an attachment, it is necessary for a portion of
the apparatus, generally the front end thereof, to engage
the surface of the work in order to control the rate of
penetration of the cutting tool as well as the depth of the
cut by mechanisms provided for that purpose. It has been
found that when using the apparatus on an uneven or a
non-perpendicular surface relative to the axis of the hole to
be countersunk, the apparatus, unless equipped with the
self equalizing device above described, had the tendency 65
to be cocked away from axial alignment with the axis
of the hole, thereby resulting in an eccentric relationship
between the hole and the countersink.
The three foot pads 43 provided on the face of the
lar to said ?rst axis with said second member being
spaced from said ?rst member, said ?rst and second axis
located within a single plane perpendicular to the median
axis of said tool, means interposed between said mem
bers normally maintaining said members parallel to said
plane and work contacting means on said second member.
4. A self-aligning attachment for a countersinking ap
paratus and the like including a housing having a rotary
cutting tool mounted on the lower portion thereof, com
prising a ?rst member and a second member disposed in
spaced planar relation with one another along the median
axis of said tool, said members surrounding said tool in
spaced and coaxial relationship therewith, said ?rst mem
ring 34 adjacent to the work piece, offer three points of 70 ber having a plurality of diametrically disposed openings
therein, a pair of spaced lugs on the lower portion of said
engagement of the front end of the apparatus with the
housing projecting through a pair of the openings in said
work and further provide purchase to prevent such drift
?rst member, means carried by said ?rst member en
or Walking of the cutting tool which may result from
gaging said lugs for pivotally connecting said ?rst mem
unequal cutting action of the tool on an uneven surface.
ber to said housing on a ?rst axis, said second member
In practice, the length of the shield 31 is such as to 75 having a pair of diametrically spaced projections thereon
3,037,401
5
arranged to project through a pair of openings in said
References Cited in the ?le of this patent
?rst member, means carried by said ?rst member engaging
UNITED STATES PATENTS
said projections for prvotally connectmg said second member to said ?rst member on a second axis perpendicular to
2,278,314
_
Houchm ———————————— -— Mar- 31, 1942
said ?rst axis, said means and lugs and projections located 5
within a single plane perpendicular to the median axis of
2,372,088
2,381,102
KaVenY ————————————— —— Mar- 20, 1945
Boyfi ————————————————— —— Aug‘ 7’ 1945
said tool, and resilient means interposed between said
2,383,854
Gwln‘n et a1 ----------- -- Aug- 28, 1945
?rst ‘member and housing and between said ?rst member
2,527,968
Sherman et a1 __________ __ Oct. 31, 1950
and second member normally maintaining said members
parallel to said plane.
10
2,669,887
2,787,866
Rees _________________ __ Feb. 23, 1954
Gross ________________ __ Apr. 9, 1957
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