close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3077231

код для вставки
Feb- 12, 1963
G. E. FRANCK ETAL
3,077,221
Filed Aug. 28, 1961
20
t'
@eofgeEj-’v'œnc/Q
3 Charleâljlïäowe,
3,077,2Zl
Patented Feb. l2, i963
2
FIG. 4 is a fragmentary elevation similar to that of
FIG. 3 but with the shoe positioned as upon completion
of a 180° bend in the tube; and
3,077,221
'
TUBE BENDER
George E. Franck, Morton Grove, and Charles L. Rowe,
FIG. 5 is a fragmentary enlarged section taken sub
stantially along the line 5_5 of FIG. 3.
In the exemplary embodiment of the invention as dis
closed in the drawing, a tube bender generally designated
. Lake Forest, Ill., assignors to Imperial-Eastman Cor
poration, a corporation of Illinois
Filed Aug. 28, 1961, Ser. No. 134,402
9 Claims. (Cl. 153-46)
10 is shown to comprise a mandrel 11 and a shoe 12
movably associated wtih the mandrel by means of a
10 connector 13. Herein, the connector is integrally asso
' In one well-known construction of manually operable
ciated with the shoe; the connector, however, may com
tube bending tools, a mandrel is provided with a tube
prise a separate element tixedly secured to the shoe by
bending peripheral groove generated about an axis. The
suitable means.
This invention relates to tube working tools and in
particular to manually operable tube bending tools.
groove is arranged to receive the tube during the bending
operation, the tube being pressed into the groove by
The mandrel 11 is provided with a peripheral segment
ally annular groove 14 generated about an axis 15 of the
mandrel and arranged to receive the tube T during the
tube bending operation. As best seen in FIGS. l and
means of a bending shoe provided with a tube pressing
surface. Conventionally, the bending shoe is moved
along the groove with the tube pressing surface thereof
5, the mandrel comprises a generally cylindrical member
having a chordal surface 16 at opposite ends of the groove
14. A conventional tube holding hook 17 may be secured
confronting the groove. To maintain the shoe in the
desired confronting relationship juxtaposed to the man
drel groove, the shoe conventionally is connected to the
mandrel by a suitable connector. The present invention
comprehends such a tube bender having a new and im»
to the mandrel at surface 16 by suitable means such as
screw 18. A handle 19 may be secured to the mandrel
11 and a handle 20 may be secured to the shoe 12 for
proved connecting means which positively retains the shoe
manipulation of the shoe 12 to eifect the desired bend
in the desired arcuate path adjacently along the mandrel 25 in the tube T.
groove while permitting a desired spacing of the shoe from _
As best seen in FIG. 5, connector 13 comprises a ñat
the mandrel periphery at a ’single preselected portion of ‘ _element pivotally juxtaposed to one surface 21 of the
the groove to permit facilitated installation and removal
mandrel 11 by means of a stepped cylindrical post 22
of the Átube in and from the space between the mandrel
projecting coaxially from the mandrel and provided at
groove and pressing surface of the shoe.
30 its opposite ends with enlarged heads 23 and 24 retaining
Thus, a principal object of the present invention is
the connector 13 and handle 19 respectively in associ
to provide a new and improved tube bender structure.
ation with the mandrel. The post includes a- ilatted
Another object of the invention is to provide such a
cylindrical mid>portion 25 retained against rotation about
tube bender structure comprising new and improved
axis 15 in a corresponding ilatted cylindrical hole 26 ex
means for connecting the shoe and mandrel element-s 35 tending axially through the mandrel 11. Adjacent en
thereof.
larged head 24, the post is provided with a portion 27
A further object of the invention is to provide such
extending through the handle 19 for fixing the handle
a tube bender structure having new and improved means
19 against rotation about the axis of the post. Between
for permitting spacing of the shoe from the mandrel
mid-portion 25 and enlarged head 23, the post is provided
groove at a single preselected portion of the groove and 40 with a portion 28 having a wedge-shaped cross section
arranged to retain the shoe in juxtaposed confronting re
and extending through a slot 29 in the connector 13.
lationship to the groove at all other portions thereof.
Referring now more speciiically to FIG. 1, slot 29
" Still another object of the invention is to provide
comprises a keyhole-shaped slot having a circular portion
such a tube bender structure wherein the connecting
30 and a generally trapezoidal portion 31 extending radi
means comprises a post on the mandrel projecting axially
ally from the circular portion. The cross section of post
therefrom and having a wedge-shaped cross section com
portion 28 comprises a portion of a circle deñned by al
prising a portion of a circle defined by allochiral converg
lochiral converging chords 32, a short arc 33, and a long
ing chords and 4diametrically opposed long and short arcs,
arc 3d. As shown in FIG. 1, the arcuate length of arc
and a connector having a first portion fixed to the shoe
34 is greater than the corresponding arcuate distance be
and4 a second portion provided with a slot for exten 50 `tween the side surfaces 35 of the trapezoidal portion 31
siontherethrough of the post, said slot having a cross
of the slot 29 at the juncture thereof with the circular
section comprising a circular portion having a diam
portion Sil. As best seen in FIG. 2, the arcuate length
eter substantially equal to the diameter of the post defined
of the short are 33 is shorter than the corresponding
by the arcs and a trapezoidal portion extending radially
arcuate distance between the side surfaces 35 at the junc~
from the circular portion and having radially outwardly 55 ture thereof with the circular portion 3d. As may be
converging side surfaces corresponding to the chords,
seen in FIG. 1, the radial length of the trapezoidal por~
whereby the connector may be disposed with the post
tion 31 is substantially less than the diameter of the post
extending selectively through the circular portion or
22 defined by the arcs 33 and 3K3. The radially outer end
through the trapezoidal portion of the slot.
of the trapezoidal portion 31 may be arcuate generally
Other features and advantages of the invention will be 60 similar to the arcuate portion 33 of the post so that, as
apparent from the following description, taken in con
nection with the accompanying drawing wherein:
FIG. 1 is a fragmentary elevation of a tube bender
provided with connecting means embodying the invention,
with a tube portion associated therewith as at the initia
shown in FIG. 1, the post effectively bottoms thereon
when received fully in the trapezoidal portion of the
slot, The side surfaces 32 of the post and the side sur
faces 35 of the slot are arranged to converge at similar
65 angles.
Thus, when the post is so disposed in slot por
tion 31, the side surfaces 32 of the post facially engage
the side surfaces 35 of the slot portion 31. Herein, the
side surfaces 32 and the side surfaces 35 respectively con~
tube bending position;
verge at the included angle of approximately 8°.
FIG. 3 is a fragmentary elevation similar to that of 70
The invention further comprehends the arrangement
FIG. 2 but with the shoe positioned as subsequent to the
of the trapezoidal portion 31 of slot 29' so as to receive
completion of a 90° bend in the tube;
the post portion 28 only when the shoe is arranged with
tion of a tube bending operation;
FIG. 2 is a fragmentary elevation similar to that of
FIG. 1 but with the shoe juxtaposed to the mandrel in a
serveer
3
ea
its tubefpressing surface 37 disposed at a preselected start
ing portion 33 of groove 1li. in the illustrate-d embodi
ment, the diameter of slot portion 3d bisecting the trape
Zoidal portion 3l extends through the bend starting por~
tion 33 and, thus, is perpendicular to the pressing surface
37 when the pressing surface is disposed at -bend starting
of many modifications. Changes, therefore, in construeF
tion and arrangement may be made without departing
from the spirit and scope of the invention as defined in
the appended claims.
'
portion 33.
To facilitate the desired bending of tube T, the mandrel
li may be provided with conventional peripheral angle
markings 39 and the connector i3 may be provided with
a sight hole 40 through which the markings 39 may be
viewed. Thus, as shown in FIG. 2, when the shoe is at
the bend starting position, the zero degree marking is
observable through the opening di). Other angles of dis
position of the sho-e relative to the bend starting position
may similarly be determined by observation of the mark
ings 39 through the opening ‘itl in the various positions
of the shoe.
The use of tube bender 1t) is seen by consecutive con
sideration of FIGS. 1-4. Thus, in FIG. l, the tube bender
is arranged so that the shoe 12» is spaced from the mandrel
sufficiently to allow lready insertion of the tube T between
the shoe surface 37 and the mandrel groove 14. To per
mit this spacing, the connector 13 is arranged so as -to
We claim:
l. in a tube bender having a mandrel provided with
a tube-bending peripheral groove generated about an
axis, and a bending shoe provided with a tube-pressing
surface for urging a tube portion into the mandrel
groove for conformation therewith, means for selectively
retaining the shoe for movement along the tube-bending
groove with the tube-pressing surface closely adjacent
thereto and for spacing the shoe substantially from the
tube-bending groove at a single preselected portion of the
groove comprising: a post on the mandrel projecting
axially therefrom, said post having a wedge-shaped cross
.section comprising a portion of a circle defined by
allochiral converging chords and diametrically opposed
long and short arcs; and a connector having a first por
tion fixed to the shoe, and a second portion provided
with a slot for extension therethrough of said post,
said slot having a cross section comprising a circular
portion having a diameter substantially equal to the di
ameter of the post defined by said arcs, and a trapezoidal
receive the post portion 23 within the trapezoidal portion 25 portion extending radially from the circular portion and
having radially outwardly converging side surfaces cor»
31 of the slot 29 with the arcuate portion 33 of the post
bottoming on the radially outer surface 36 of the slot.
To dispose the shoe 12 in position for the beginning of
responding to said chords, whereby said connector may
be disposed with said post extending selectively through
said circular portion or through said trapezoidal portion.
the bend, the shoe is then moved toward the mandrel
2. The tube bender means of claim 1 wherein said
until the connector 13 is redisposed so as to have post por 30
tion 28 disposed fully within the circular portion 30 of
post includes enlarged end portions retaining the post
against substantial axial movement in said mandrel.
the slot. Suitable manipulation of handle 20 may then
3. The tube bender means of claim l wherein said
be effected to move the shoe circumferentially along the
long are is longer than the corresponding arcuate distance
peripheral groove 14 from the position of FIG. 2 to the
between said side surfaces of the trapezoidal portion of
position of FIG. 3. During this movement, the arcuate
the slot at the juncture thereof with said circular portion
surfaces 33 and 34 of the post have sliding facial engage
ment with the cylindrical surface 30 of the slot 29 posi
of the slot.
tively retaining the shoe surface 37 juxtaposed t-o the
4. The tube bender means of claim 1 wherein the
radial length of said trapezoidal portion is substantialiy
mandrel periphery for proper bending of the tube T into
40 less than the diameter of the post defined by .said arcs.
the groove 14.
Referring now to FlG. 4, the manipulation of shoe 12
5. The tube bender means of claim 1 wherein the
trapezoidal portion of the slot includes a radially outer
may be continued, if desired, until the shoe is redisposed
approximately 180° from the bend starting position
arcuate end surface substantially similar to the portion
'whereby the tube Tis bent int-o a U-shaped configuration.
of the post defined by said short arc whereby the post
.As the arcuate surface 34t- of the post now confronts the
may be bottomed on said end surface with the portion
-trapezoidal portion 3i of the slot, and as the length of the
of the post defined by said chords facially engaging said
:arcuate surface 34 is substantially greater than the cor
side surfaces of the slot.
:responding arcuate spacing between the slot surfaces 35
6. The tube bender means of claim l wherein said
'at the juncture thereof with the circular portion 30, the
-glâords converge at an included angle of approximately
post is positively prevented from entering the trapezoidal
-portion 3l. Thus, the post is effectively precluded from
7. in a tube bender having a, mandrel provided with
4catching or hanging up and a simple foolproof manipula
a tube-bending peripheral groove generated about an
:tion of the tube bender is assured.
axis, and a bending shoe provided with a tube-pressing
To release the bent tube, the handle 253` is manipulated
surface for urging a tube portion into the mandrel groove
‘to return the shoe l2 back to the starting position of 55 for conformation therewith, means for selectively re
FIG. 2 whereupon the post is once again aligned with
taining the shoe for movement along the tube-bending
,the trapezo-idal portion 31 of the slot so as to permit the
groove with the tube-pressing surface closely adjacent
>ready movement of the shoe outwardly from the position
thereto and for spacing the shoe substantially from the
lof FIG. 2 to the position of lG. l. A_s the shoe is then
tube~bending groove at a preselected bendstart portion
substantially spaced from the mandrel, the bent tube may 60 of the groove comprising: a cylindrical post on the
be removed from the mandrel groove as desired. Tube
mandrel projecting axially therefrom, said post having a
bender l@ is then ready for a subsequent bending opera~
wedge-shaped cross section comprising a portion or" a
’tion similarly as discussed above.
circle defined by allochiral converging chords and di
As a substantial surface enagement occurs between the
ametrically opposed long and short arcs, the center of
post and the circular portion of the mandrel slot at all
said arcs being disposed on a diameter of said axis ex’
times during the bending operation, improved trouble
tending through the bend-start portion of the mandrel
free life of the bending tool is obtained. Further, the
groove; and a connector having a first portion fixed to
connection between the mandrel and the shoe is extremely
the shoe, and a second portion provided with a slot
rugged so as to assure maintained alignment of the shoe
for extension therethrough of said post, said slot having
surface 37 relative to the groove lo at all times. Further, 70 a cross section comprising a circular portion having a
the simple structure of the connecting means effectively
minimizes the cost of the bending tool while effectively
maximizing etiiciency and facility of operation.
While we have shown and described one embodiment
,of our invention, it is >to be understood that it is capable
diameter substantially equal to the diameter of the post
defined by said arcs, and a trapezoidal portion extending
radial-ly from the circular portion and away from said
circular portion and having converging side surfaces
corresponding to said chords, whereby said connector
5
3,077,221
may be disposed selectively with `said post extending
selectively through said circular portion or through said
trapezoidal portion.
6
ular to a diameter of said circular portion of the slot
bisecting said trapezoidal portion thereof.
9. The tube bender means of claim 7 wherein the
3. The tube bender means of claim 7 wherein said
radial length of said trapezoidal portion of the slot is
first portion of the connector is fixed to the shoe to have 5 greater than the diameter of the tube to be bent.
said tube~pressing surface extend substantially perpendic
No references cited.
Документ
Категория
Без категории
Просмотров
0
Размер файла
479 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа