U.S. patent number 3,788,123 [Application Number 05/221,934] was granted by the patent office on 1974-01-29 for flaring tool.
This patent grant is currently assigned to Deutsch Fastener Corp.. Invention is credited to Bulent Gulistan.
United States Patent |
3,788,123 |
Gulistan |
January 29, 1974 |
FLARING TOOL
Abstract
A flaring tool including a die adapted to engage the end of a
sleeve and an element adapted to grip the shank of a fastener
extending through the sleeve, with a tension force being applied to
the shank and an inward force being applied to the die through the
actuation of a lever. The gripping element is slidable in a body,
with the lever being pivotally mounted on one side of the body. A
spacer may be provided to render the die inoperative so that the
tool may be used to force an interfering part into an opening in
the workpiece without simultaneously bending the flange. Such a
part may be a nut with a knurled exterior that becomes embedded in
the workpiece to prevent the nut from rotating. A member may be
substituted for the die to exert a pull on a fastener attached to
the workpiece for accomplishing removal of the fastener.
Inventors: |
Gulistan; Bulent (Malibu,
CA) |
Assignee: |
Deutsch Fastener Corp. (Los
Angeles, CA)
|
Family
ID: |
27369610 |
Appl.
No.: |
05/221,934 |
Filed: |
January 31, 1972 |
Related U.S. Patent Documents
|
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
59273 |
Jul 29, 1970 |
3665581 |
|
|
|
784527 |
Nov 29, 1968 |
3561093 |
|
|
|
744260 |
Jun 13, 1968 |
|
|
|
|
578728 |
Sep 12, 1966 |
|
|
|
|
Current U.S.
Class: |
29/243.529 |
Current CPC
Class: |
B25B
27/0007 (20130101); B21J 15/32 (20130101); B21J
15/386 (20130101); B21J 15/043 (20130101); Y10T
29/53765 (20150115) |
Current International
Class: |
B21J
15/00 (20060101); B21J 15/04 (20060101); B21J
15/34 (20060101); B25B 27/00 (20060101); B21j
015/34 () |
Field of
Search: |
;72/391,114
;29/243,52 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Herbst; Richard J.
Assistant Examiner: Crosby; Gene P.
Attorney, Agent or Firm: Richard F. Carr et al.
Parent Case Text
This application is a division of my copending U.S. Pat.
application Ser. No. 59,273, filed July 29, 1970, for Flaring Tool,
now Pat. No. 3,665,581, which is a division of U.S. Pat.
application Ser. No. 784,527, filed Nov. 29, 1968, for Flaring
Tool, now U.S. Pat. No. 3,561,093, which is a continuation-in-part
of my patent application Ser. No. 744,260, filed June 13, 1968, for
Flaring Tool, now abandoned, which is a continuation-in-part of my
patent application Ser. No. 578,728, filed Sept. 12, 1966, for
Flaring Tool, now abandoned.
Claims
I claim:
1. A device for forming a flange on a part having a tubular portion
having an end portion adapted to be bent into a flange, a
transverse shoulder adjacent said tubular portion and remote from
said end portion thereof, and a gripping portion axially of said
tubular portion comprising
a body,
a die member carried by said body,
said die member having an opening therethrough and an annular
recess means circumscribing said opening,
said recess means being adapted for engagement with said end
portion of such a tubular portion,
a movable member carried by said body, said body including means
for guiding said movable member for movement relative to said body
in a rectilinear path along an extension of the axis of said recess
means from a position adjacent said recess means to a position
remote therefrom, said movable member including means for engaging
and holding such a gripping portion,
lever means pivotally carried by said body and engaging said
movable member for exerting a force on said movable member and
imparting said relative movement thereto for producing a reaction
on said body forcing said annular recess means against said end of
said tubular portion for causing said die member at said annular
recess means to bend said end portion of said tubular portion into
a flange, and a removal means,
said removal means including
a first member having a surface means adapted to engage the surface
of a workpiece to which said part is attached, a second member
movable relative to said first member,
said second member having surface means adapted to engage said
shoulder of such a part,
and means for attaching said first and second members to said body
and for connecting said second member to said movable member
for movement of said second member by said movable member and
relative to said first member for causing said surface means of
said second member to engage said shoulder of said part for
exerting a pull thereon and removing said part from said workpiece
while said surface means of said first member so engages said
workpiece.
2. A device as recited in claim 1 in which said surface means of
said second member is inwardly of said surface means of said first
member.
3. A device as recited in claim 2 in which said means for attaching
said first and second members to said body and for connecting said
second member to said movable member includes means for positioning
said first member in juxtaposition with said die member.
4. A device as recited in claim 3 in which
said surface means of said first member is defined by an outer end
wall of said first member, said surface means of said second member
is defined by an outer end wall of said second member, and
including resilient means relatively biasing said end walls toward
a position of interengagement.
5. A device for forming a flange on a fastener having a tubular
portion and a gripping portion axially thereof comprising
a body,
a die member carried by said body,
said die member having an end face having an opening therethrough
and an annular recess means in said end face circumscribing said
opening,
said recess means being adapted for engagement with the end of such
a tubular portion which is to be bent into a flange,
a movable member carried by said body,
said body including means for guiding said movable member for
movement relative to said body in a rectilinear path along an
extension of the axis of said recess means from a position adjacent
said recess means to a position remote therefrom, said movable
member including means for engaging and holding such a gripping
portion,
lever means pivotally carried by said body and engaging said
movable member for exerting a forcce on said movable member and
imparting said relative movement thereto for producing a reaction
on said body forcing said end face against said end of said tubular
portion for causing said die member at said annular recess means to
bend said end of said tubular portion into a flange, and a fastener
removal means,
said fastener removal means including
a first member secured to said body,
said first member having a recessed surface means adapted to
receive a tubular portion of a fastener and simultaneously engage
the surface of a workpiece to which said fastener is attached,
and a second member movable relative to said first member,
said second member having recessed surface means adjacent said
recessed surface means of said first member and adapted to receive
said tubular portion of a fastener,
said second member including means extending to said movable member
and gripped thereby,
whereby said second member is movable by said movable member for
causing said recessed surface means of said second member to engage
a shoulder of said fastener for exerting a pull thereon and
removing said fastener from said workpiece.
6. A device for forming a flange on a part having a tubular portion
and a gripping portion axially thereof comprising
a body,
a die member carried by said body,
said die member having an end face having an opening therethrough
and an annular recess means in said end face circumscribing said
opening,
said recess means being adapted for engagement with the end of such
a tubular portion which is to be bent into a flange, a movable
member carried by said body,
said body including means for guiding said movable member for
movement relative to said body in a rectilinear path along an
extension of the axis of said recess means from a position adjacent
said recess means to a position remote therefrom, said movable
member including means for engaging and holding such a gripping
portion,
lever means pivotally carried by said body and engaging said
movable member for exerting a force on said movable member and
imparting said relative movement thereto for producing a reaction
on said body forcing said end face against said end of said tubular
portion for causing said die member at said annular recess means to
bend said end of said tubular portion into a flange, and a fastener
removal means,
said fastener removal means including
a first member having an inner surface engaging said face of said
die member,
said first member having an open side portion and having an outer
transverse wall having a lateral recess therein,
a second member,
said first member including a portion slidably receiving said
second member and guiding said second member in a rectilinear path
relative to said first member,
said second member including a shank,
said movable member gripping said shank of said second member for
moving said second member with said movable member,
said second member having an open side portion adjacent said open
side portion of said first member,
and having an outer transverse wall adjacent and inwardly of said
outer transverse wall of said first member,
said transverse wall of said second member having a lateral recess
therein,
said lateral recesses and open side portions being adapted to
receive a further tubular portion of a fastener and said outer
transverse wall of said first member to engage the surface of a
workpiece to which said fastener is attached,
said transverse wall of said second member being engageable with a
shoulder of said fastener upon said movement of said second member
for exerting a pull on a fastener to remove the same from said
workpiece.
7. A device for separating a fastener from an opening in a
workpiece with a first shoulder of a tubular portion of the
fastener engaging one side of the workpiece, a second shoulder
being outwardly of the one side of the workpiece, and wherein a
flange is bent over the opposite side of the workpiece in
cooperation with the first shoulder and holding said fastener to
said workpiece, the device comprising
a first member,
said first member having a side recess therein for receiving said
tubular portion of said fastener and an exterior end surface for
engaging said one side of said workpiece,
a second member in said first member,
said second member having a side recess therein for receiving said
tubular portion of said fastener and an inner transverse surface
for engaging said second shoulder of said fastener,
and means for moving said second member relative to said first
member away from said end surface of said first member for causing
said transverse surface of said second member to exert a force on
said second shoulder causing said flange to become deflected and
said fastener to become loosened from said workpiece.
8. A device for loosening the flange of a part having a tubular
portion extending through an aperture in a workpiece, with the
tubular portion having a flange bent outwardly at one end thereof
on one side of the workpiece, and a first shoulder on the opposite
side of the workpiece for thereby retaining said tubular portion to
the workpiece, the part further having a second shoulder at a
location spaced outwardly of the workpiece from said first
shoulder, the device comprising
a body,
a lever,
means pivotally connecting said lever to said body,
a slide member in said body,
means connecting said lever to said slide member,
whereby upon pivotal movement of said lever relative to said body
said slide member is caused to move relative to said body,
a first member fixed relative to said body,
said first member having open side wall portions, and having a
recessed end wall adapted to receive said part adjacent said first
shoulder thereof and engage adjacent surface portions of said
opposite side of said workpiece,
and a second member,
said second member having open side wall portions and a recessed
end wall registering with said side wall portions and end wall of
said first member, respectively,
said end wall of said second member being inwardly of said end wall
of said first member, and said recessed end wall of said second
member being dimensioned to receive said part adjacent said second
shoulder of said part,
whereby upon pivotal movement of said lever said second member is
moved relative to said first member and said recessed end wall of
said second member engages said second shoulder of said part for
thereby moving said part with said second member and deflecting
said flange of said part.
9. A device as recited in claim 8 including in addition stop means
for limiting said movement of said second member so that said
second member imparts a predetermined deflection to said flange
loosening the engagement between said flange and said workpiece.
Description
This invention pertains to a tool for providing a flanged end on a
tubular member and for removing such a member from a workpiece.
The tool of this invention can be used to advantage with fasteners
which include tubular elements which are used in securing the
fastener to the workpiece. Typically, ths may be a captive screw in
which the tubular element retains the fastener to the workpiece,
and through which extends a stud for engaging a mating fastener
component. It is necessary in installing such fasteners to bend the
end portion of the tubular member outwardly over the surface of the
workpiece to form the attachment to it. Previously, this usually
has been done by manually tapping a tool against the end of the
tubular member. This is a laborious process, difficult to achieve
in cramped quarters and one which provides inconsistent results.
Moreover, in the past there has been no ready means for removing
the fastener from the workpiece once the flange has been
formed.
The device of the present invention both installs and removes such
tubular elements rapidly and easily. The tool includes a housing to
which a handle is pivoted, and within which is a slidable element
adapted to engage one portion of the fastener to be secured. The
handle, through a cross pin, connects to the slidable member. The
end of the housing has a die surface which engages the end of the
tubular member, so that, when the handle is rotated, the slidable
member moves relative to the housing and the die surface forms the
flange. The member to which the handle is pivotally connected may
be spring-loaded, so that the pivot point will shift after the
handle has imparted a predetermined force on the fastener being
secured. This avoids overstressing any of the parts from squeezing
the handle too tightly. For removal of the tubular element of the
fastener, an adapter is attached to the end of the tool, allowing
the fastener to be pulled axially so that the flange is bent back
to a cylindrical form and the fastener is separated from the
workpiece easily.
In securing a tubular element to a workpiece, it is provided with a
head at one end and extended through an opening in the workpiece so
that its opposite end projects beyond the surface of the workpiece
past the opening. A stud is extended through the tubular element
and a tension force exerted on the shank of the stud, holding the
head of the tubular element against one side of the workpiece. With
this force applied, the opposite end of the tubular element is bent
outwardly to provide the flange. When the workpiece is of
compressible material, such as a honeycomb panel, the tubular
element may be made flush with the workpiece simultaneously with
the formation of the flange. This is done by exerting a force on
the tubular element of sufficient magnitude to deflect the
workpiece inwardly and allow the head of the tubular element to
become buried in the recess thus formed, resulting in a flush
surface. Also, the flange formed at the opposite end may be pushed
inwardly so that it, too, is recessed and the installation is flush
at both ends.
The tool also can be used in a two-step operation by which it
initially forces a part into an opening in the workpiece and then
bends the flange outwardly. Such a part may be a nut having a
straight knurl on its periphery which becomes embedded in the
workpiece around the opening to prevent the nut from rotating. The
knurled portion must be forced into the opening in order for it to
cut into the workpiece. In installing the nut, a spacer is provided
to hold the die away from the workpiece as the knurled section is
pulled into the opening, after which the spacer is removed and the
flange is bent. Without the spacer, the tool will tend to bend the
flange while it forces the knurled part into the opening, resulting
in a loose connection of the part to the workpiece.
An object of this invention is to provide an improved flaring
tool.
Another object of this invention is to provide a tool which will
rapidly and easily bend a flange on a tubular member.
Yet another object of this invention is to provide a tool which
will form a flange for attachment of a tubular member to a
workpiece, and subsequently can be used to pull axially on the
tubular member to remove it.
A further object of this invention is to provide a tool which is
capable of attaching and removing a wide variety of fasteners that
incorporate tubular members.
An additional object is to provide a tool where a flanged tubular
member attached to a workpiece can be moved a predetermind distance
axially to partially strengthen the flange and result in a looser
attachment to a workpiece, which allows floating movement.
A still further object of this invention is to provide a tool
capable of forcing a part into an opening in a workpiece without
forming a flange on the part, and subsequently bending the
flange.
These and other objects will become apparent from the following
detailed description taken in connection with the accompanying
drawing in which:
FIG. 1 is a perspective view of the tool of this invention;
FIG. 2 is an enlarged longtiudinal sectional view of the tool;
FIG. 3 is a view similar to FIG. 2 with the tool attached to a
fastener and the handle rotated during the formation of a flange on
the fastener;
FIG. 4 is a view similar to FIG. 3 but with the handle rotated
further, illustrating the overtravel provision that limits the
force that can be applied;
FIG. 5 is an enlarged fragmentary illustration of the forward
portion of the tool as initially associated with the fastener;
FIG. 6 is a view similar to FIG. 5 with the formation of the flange
complete;
FIG. 7 is a longitudinal sectional view of the fastener after being
secured to the workpiece by the tool;
FIG. 8 is an end elevational view of the arrangement of FIG. 7;
FIG. 9 is a fragmentary sectional view of the tool modified to
secure a fastener having a slotted rather than threaded shank;
FIG. 10 is a perspective view of the slidable member used in
attaching the fastener of FIG. 1;
FIG. 11 is a fragmentary sectional view of the tool as used in
securing a nut to a workpiece;
FIG. 12 is a perspective view of the adapter used for removing a
flanged fastener from a workpiece;
FIG. 13 is a top plan view using the adapter of FIG. 12 associated
with a fastener to be separated from the workpiece;
FIG. 14 is a longitudinal sectional view taken along line 14--14 of
FIG. 13;
FIG. 15 is a view similar to FIG. 14 after operation of the tool to
loosen the fastener;
FIG. 16 is a perspective view of a spacer which can be used with
the adapter for enabling the adapter to loosen a fastener which is
to have a floating connection to a workpiece;
FIG. 17 is a longitudinal sectional view of the tool utilizing the
spacer of FIG. 16 and associated with a fastener to be loosened
FIG. 18 is a view similar to FIG. 17 after actuation of the tool to
loosen the fastener;
FIG. 19 is a sectional view of a sleeve secured to a workpiece in
accordance with this invention;
FIG. 20 is an elevational view, partially broken away, illustrating
a nut which is to be inserted into an opening into a workpiece and
provided with an outwardly bent flange by the use of the tool;
FIG. 21 is an elevational view, partially in section, of the nut of
FIG. 20 in the installed position;
FIG. 22 is a sectional view taken along line 22--22 of FIG. 21;
FIG. 23 is a fragmentary perspective view of the tool with an added
spacer for use in installing parts having a knurled exterior;
FIG. 24 is an enlarged end elevational view of the tool of FIG.
23;
FIG. 25 is a top plan view of the tool and spacer, with the tool
engaging a part having a knurled periphery, and the spacer engaging
the surface of a workpiece around an opening therein;
FIG. 26 is a sectional view taken along line 26--26 of FIG. 25, but
with the tool shifted in position to draw the knurled section of
the part into the opening in the workpiece;
FIG. 27 is a sectional view illustrating the tool in a subsequent
position for bending the flange;
FIG. 28 is a sectional view showing the device after bending the
flange on the part;
FIG. 29 is a sectional view illustrating a sleeve associated with a
panel of compressible material for attachment to it;
FIG. 30 is a sectional view illustrating the next step in which the
tool is associated with the end of the shank of the member
extending through the sleeve;
FIG. 31 is a sectional view of the assembly after actuation of the
tool, with the flange having been bent outwardly on the end of the
sleeve; and
FIG. 32 is a sectional view illustrating the sleeve and panel after
the attachment.
With particular reference to FIGS. 1 and 2 of the drawing, the tool
of this invention includes a housing 10 to which is attached a
pivotal handle 11. The housing 10 includes an upper and a lower
tubular member 12 and 13, which are secured together in a parallel
relationship by brazing, welding or other suitable means. The
handle 11 includes a U-shaped end portion 14, which extends around
the upper tubular member 12 and, by means of a pin 15, is pivotally
connected to a cross head 16 extending transversely at the forward
end of the tube 13. A shaft 17 extends longitudinally into the tube
13 from the cross member 16, passing through a bushing 18 at the
forward end of the tube 13. The opposite end of the shaft 17 is
threaded and is received within a nut 19 that has a circular
periphery, slidably received in the tube 13. A compression spring
20 extends around the shaft 17 between the bushing 18 and the nut
19.
Above the pin 15, the forward portion 14 of the handle 11 receives
a second pin 22 that extends into vertically elongated opposed
slots 23 in the handle. The pin 22 extends diametrically through
the upper tube 12, passing through opposed slots 24 in the tube
wall, which are elongated in the direction of the axis of the tube
12. The pin 22 also extends through a substantially complementary
opening in a slide 25 within the upper tube 12. The slide is guided
by the tube 12 so that it can move in a rectilinear path axially of
the tube. One end of the slide 25 includes a dome-shaped
protuberance 26 that fits within and centers a compression spring
27. A similar protuberance 28 is provided at the opposite end of
the spring 27 on a nut 29 received in the threaded rearward end
portion of the tube 12.
Opposite from the spring 27, the slide 25 includes an axial
threaded opening 31 which receives the threaded stud portion 32 of
a member 33 that projects forwardly from the slide. A radial
shoulder 34 on the member 33 engages the radial end wall 35 of the
slide 25. The opposite end of the member 33 includes an inwardly
tapering frustoconical section 36 leading toward an axially
inwardly extending threaded opening 37.
At the forward end of the upper tubular member 12 is the die member
39. The tubular member 12 includes an internally threaded portion
40 at its forward end, which receives the threaded rearward end 41
of the die member, while the radial shoulder 42 of the die member
contacts the end edge surface of the tubular member 12. The
periphery of the member 39 beyond the tube 12 may be hexagonal, as
illustrated in FIG. 1, to facilitate tightening the die member in
place.
On the forward face of the die member 39 is an annular projection
43 having an outer radial face 44 in which is formed an annular
groove 45. An opening 46 in the end of the die member is inside and
coaxial with the groove 45. This axis also is coincident with that
of the tube 12 which defines the path of movement of the slide 25.
Preferably, the recess 45 in cross section is defined by a section
of a circle which is less than a semicircle. In a typical example,
providing superior results in forming flanges for the tubular
fastener parts, the surface of the groove 45 is defined by a radius
of 0.046 inch and has a depth of 0.015 inch beneath the radial face
44.
Interiorly, the die member 39 includes a cylindrical bore 47,
spaced outwardly of the member 33, connecting to an inwardly
tapering frustoconical portion 48 adjacent the outer end of the
member 39. The slope on the surface 48 is the same as that of the
surface 36 of the member 33. The compression spring 27 reacting
through the slide 25 normally maintains the surface 36 of the
member 38 in engagement with the surface 48 of the die member
39.
In FIGS. 3--8, the use of the tool of this invention in forming a
flange on the tubular element of a fastener is illustrated. The
precise form of the fastener is not critical, but normally such a
fastener will include a tubular member and a threaded stud as in
the design shown. This fastener 50, therefore, is made up of a
tubular collar 51 having a performed flange 51 at one end adjacent
the head 53 of the stud member from which extends a threaded shank
54. The sleeve 51 fits through an aperture in the workpiece 55 so
that the shoulder defined by the flange 52 prevents axial movement
of the sleeve to the right as the device is illustrated. When fully
installed, the opposite end 56 of the sleeve, which projects beyond
the surface 57 of the workpiece 55 when the sleeve is inserted, is
bent over the surface 57 of the workpiece 55, as indicated in FIGS.
7 and 8. This forms a second flange, which cooperates with the
flange 52 at the workpiece surface 57 in holding the sleeve 51 to
the workpiece 55. To facilitate the outward bending of the flange,
the bore through the sleeve 51 includes an internally enlarged
portion 58 at the end 56.
In installing the sleeve 51, it is first fitted through the
aperture in the workpiece 55, as indicated in FIG. 5. The
projecting shank 54 of the stud then is threaded into the opening
37 in the member 33 of the tool. This brings the inner edge portion
of the groove 45 of the die member into adjacency with the end
corner of the sleeve 51 on the inner edge at the bore 58. Thus, the
die groove 45 is inclined both radially and axially outwardly at
the portion adjacent the end of the tubular element 51.
After this has been done, the handle 11 is pivoted about the pin
15. This is accomplished conveniently by gripping the lower tube 13
and the handle 11 with one hand and squeezing them together. As the
handle 11 pivots about the pin 15, the second transverse pin 22
moves the slide 25 axially relative to the upper tube 12 of the
tool. As the slide 25 is shifted within the tube 12, it pulls on
the member 33 that is attached to it. This also exerts a tension on
the shank 54 of the fastener 50, because the shank is threadably
engaged with the member 33. The stud cannot move axially, however,
because the head 53 engages the flange 52 adjacent the surface 57
of the workpiece 55, preventing such travel to the right as the
device is shown. Therefore, the force from the handle is
transmitted to the housing 10 through the cross member 16, its
shaft 17, the nut 19 and the compression spring 20. This produces a
reaction on the housing 10, which moves the die member 39 to the
left as the device is shown against the end 56 of the sleeve 51.
The die exerts a force, therefore, which bends the end portion 56
of the sleeve 51 outwardly along the inclined surface of the die
groove 45. As the bending progresses, the radially outward portions
of the groove are engaged by the tube end. This directs the tube
end back toward the surface 57 of the workpiece 55. As a result,
the end 56 of the collar 51 is bent into an outwardly extending
flange that is tightly forced against the surface 57 of the
workpiece, as shown in FIGS. 3 and 6. Thus, by a simple squeezing
of the handle, the flange is formed and the fastener 50 is secured
to the workpiece 55.
During use of the tool, some persons may tend to exert an excessive
force on the handle 11. This could be so great that, in the absence
of a safety provision, damage could result to the fastener 50, the
workpiece 55 or the tool. The tool of this invention automatically
prevents any overstressing of the parts in this manner, limiting
the amount of force that can be applied, regardless of how hard the
handle is compressed.
When the handle has been moved partway in its rotational travel
about the pin 15, the flange will be fully formed, as illustrated
in FIGS. 3 an 6. However, it may not be apparent to the operator of
the tool that this has occurred, and the application of force may
be continued. When the radial face 44 of the die member 39 bottoms
against the wall of the workpiece 55 as the flange is formed, there
will be an added resistance to the movement of the handle 11
relative to the housing 10. Therefore, a higher force is imposed
upon the compression spring 20 that transmits the force from the
handle to the housing. The spring 20 is calibrated such that at a
predetermined force value, within safe limits, it will begin to
compress and allow the member 17 to shift axially to the left as
the device is shown. This effect may be seen in FIG. 4.
Consequently, the continued rotation of the handle merely
compresses the spring 20, but does not impose a significantly
greater force on the tool or the workpiece. Ultimately, the travel
of the handle is halted as it is fully pivoted to engage the lower
tubular member 13.
In essence, therefore, the handle rotates relative to the housing
first about the pin 15 as the flange is formed on the tube 51.
Then, when the resistance becomes greater as the die bottoms
against the workpiece, the handle pivots about the pin 22 as the
bottom pin is shifted in position and no longer serves as the
fulcrum. The vertically elongated slots 23 in the handle and the
longitudinally elongated slots 24 in the upper tube 12 allow the
parts associated with the housing 10 to move linearly as the
rotational motion of the handle takes place. Thus, through the use
of the tool of this invention, a correct installation is assured
without damage to any component involved through the automatic
limiting of the amount of force that can be applied by the
tool.
Adjustability of the limiting force is provided through the nut 19,
which can be positioned within the tube 13 to vary the compression
of the spring 20. When the handle 11 is released, the spring 27
returns to its original position where the movement is stopped by
engagement of the surfaces 36 and 48 of the member 33 and the die
39, respectively. Rotation of the nut 29 controls the force of the
spring 27.
For fasteners of different sizes, the same basic tool is used,
while the members 39 and 33 may be replaced as required. This
allows the die to be selected so that it will present a groove that
will form a flange on fastener sleeves of different diameters.
Also, the slidable member 33 can provide an opening to fit threaded
shanks of various diameters.
The tool of this invention is readily adapted for attaching
different kinds of fasteners, such as the type shown in FIGS. 9 and
10. Here, the fastener 59 includes a tubular sleeve 60 having a
shoulder 61 on one side of the workpiece 62, and an end section 63
on the opposite side of the workpiece to be flared outwardly to
form an attaching flange. The stud portion of this fastener has a
straight unthreaded shank 64, at the end of which is an axial
opening and a pair of arcuate slots 65 that terminate in locking
recesses. This type of fastener is operated by a quarter turn of
the stud to form a quick attaching device as the slots 65 are
engaged with a transverse pin in an associated receptacle. A
fastener utilizing a stud of this type may be seen in U.S. Pat.
Nos. 1,955,740 and 2,564,101.
For attaching the fastener 59, the member 33 of the tool is removed
and replaced by a member 67, which in most respects is identical to
the member 33. The member 67 includes a similar threaded stud
portion 68 that extends into the opening 31 and the slide 25, while
the frustoconical forward portion 69 is adapted to bear against the
complementary frusto-conical surface 48 of the die member 39.
Instead of a threaded opening, however, there is a straight bore 70
in the member 67 at the forward end portion of this is a transverse
pin 71.
The tool, with the member 67 installed, engages the fastener 59
simply by rotating the tool or the stud so that the pin 71 enters
the arcuate slots 65. This locks the member 67 to the shank 64, so
that, upon movement of the handle 11, the die is forced inwardly to
bend the flange at the end portion of the sleeve element 60. Again,
therefore, there is an attachment between the stud part of the
fastener and the slide element, while the body portion of the
device forces the die inwardly to bend the flange and secure the
fastener to the part.
In some instances, it may be desired to secure only a sleeve in an
opening, rather than a fastener as seen in FIGS. 4 through 10. This
may be, for example, to provide a bushing to protect a part at an
opening where a member is to extend through the opening in the part
during its use. Parts made of laminated glass fibers or various
other materials may be protected in this manner, as the sleeve in
the opening will prevent damage to the part from a bolt or other
element extended through the opening as the part is in service.
The attachment of such a sleeve is accomplished essentially as
described above for the fastener assemblies. A sleeve, such as the
sleeve 51 of FIGS. 5 through 7, is extended through the opening in
the workpiece, and an additional member is introduced into the
sleeve. This member will have a gripping portion, which may be
threaded as the shank 54, or have slots or other gripping means,
such as the slots 65 of the device of FIG. 9. The gripping portion
of the member then is engaged by the tool and the flange is bent as
before. After this, the member is removed from the sleeve, leaving
the latter element in the opening in the part to serve its
protective function. The sleeve 51, with the stud removed following
the formation of the flange 56, as shown in FIG. 19, will serve as
a protective bushing in this manner for the part 55.
The tool of this invention will operate equally satisfactorily
where the fastener or other device has no projecting stud portion
as in the previously described embodiments. For example, as shown
in FIG. 11, the fastener comprises a nut 74 having a tubular
section 75 extending through and beyond the workpiece 76. The
projecting part of the section 75 is to be bent outwardly to form
the flange securing the nut 74 to the workpiece. For this type of
installation, the tool embodiment of FIGS. 1-6 may be used without
modification except for the addition of a threaded stud 77, one end
of which is received in the threaded opening 37 of the member 33.
The other end of the stud 77 enters the threaded opening 78 in the
nut 74 as the tool is associated with the part. This brings the die
surface 45 adjacent the end of the section 75 and, when the handle
is squeezed, the flange is formed in the usual way. Here,
therefore, the stud for the fixed element during the operation of
the tool is furnished as a portion of the tool, rather than being a
part of the workpiece.
For removing a fastener from the workpiece, the adapter 79
illustrated in FIGS. 12-15 is associated with the forward end of
the tool. This adapter includes an outer sleeve 80 which is cut
away on one side near its end wall 81. This provides an opening 82
in the circumferential wall of the sleeve 80. The end wall 81 has a
laterally extending recess 83, giving the end wall a bifurcated
configuration. Within the outer sleeve 80 is a shorter inner sleeve
84 having a relatively thick dislike end wall 85 beyond the opening
82. The other end wall 86 of the member 84 is laterally recessed so
that it is bifurcated and similar to the wall 81 of the outer
sleeve. Intermediate the ends 85 and 86, the sleeve 84 is cut away
on one side to provide an opening 87 registering with the opening
82 in the outer sleeve 80. A stud 88 has one end threaded into the
central portion of the end wall 85 of the sleeve 84, while the
opposite end of the stud extends into the threaded opening 37 of
the member 33. This attaches the sleeve 84 to the member 33, so
that, when the handle is moved, the member 84 will travel with the
slide 25.
A disk 89 extends into the end of the outer sleeve 80, being
positioned by its flange 90 and a set screw 91 that engages a
recessed portion in the wall of the disk. An opening 92 in the
center of the disk slidably receives the stud 88. In addition, the
disk 89 has an offcenter opening that receives a dowel pin 93,
which projects from the member 89 to enter an opening 94 in the end
wall 85 of the sleeve 84. The pin 93 in the opening 94 maintains
the sleeve 84 rotationally aligned relative to the outer sleeve, so
that openings 82 and 87, as well as the end walls 81 and 86, are in
registry. A spring 95 is positioned between the disk 89 and the
sleeve 84 and maintains the bifurcated end walls 81 and 86 normally
in engagement. When the adapter 79 is attached to the tool, the
outer wall 96 of the end disk 89 is brought into engagement with
the radial face 44 of the die member 39.
As shown in FIGS. 13, 14 and 15, the adapter is being used to
remove a fastener 97 of the type illustrated in U.S. Pat.
3,346,032, issued Oct. 10, 1967, for Captive Screw. This type of
fastener includes an inner sleeve 98 extending through an opening
99 in the workpiece 100 and bent over at its outer end to provide a
flange 101. This cooperates with a shoulder 102 at the opposite
surface 103 of the workpiece in securing the sleeve 98 to the
workpiece. The flange 101 may be formed by the tool of this
invention in the manner described above. The member 98 includes an
outwardly extending shoulder 104 spaced axially from the surface
103 of the workpiece 100, which is engaged by an inwardly extending
shoulder 105 on an outer sleeve 106. The latter member is connected
to a head 107 from which a stud 108 extends. A compression spring
109 normally keeps the fastener retracted, as shown, but can be
compressed as the fastener is advanced when the stud 108 is
threaded into an adjoining workpiece.
In removing the fastener 97 from the workpiece 100, the end wall 81
is placed adjacent the surface 103 of the workpiece and the adapter
is moved laterally so that the sleeve 98 extends through the
openings in the bifurcated end walls of the sleeves 80 and 84. This
brings the outer sleeve 106 of the fastener 97 through the open
side walls of the sleeves 80 and 84 so that it is positioned
approximately at the axial center. At this time, the handle 11 of
the tool is rotated relative to the bottom tube 13 so that the
slide 25 shifts relative to the housing 10. As this occurs, the
housing 10 remains axially fixed because of the engagement between
the surface 44 of the die member 39 and the end flange 90 of the
disk 89. The latter member, in turn, is secured in the outer sleeve
80 of the adapter 79, the end wall 81 of which bears against the
surface 103 of the workpiece so that the housing 10 of the tool
cannot move. Therefore, as the handle 11 rotates relative to the
housing 10, the slide 25 draws the member 33 inwardly and with it
the inner sleeve 84 of the adapter. This brings the end wall 86 of
the inner sleeve 84 into engagement with the shoulder 105 of the
outer sleeve 106 of the fastener, which, through the shoulder 104
of the sleeve 98, exerts an axial force on the latter member. This
force simply straightens the flange 101, pulling the flange portion
into the opening 99 through the workpiece. The flange 101 is bent
back to cylindrical shape as it is drawn through the opening 99 so
that it no longer secures the fastener to the workpiece. This
action of the tool in removing the fastener is illustrated in FIG.
15. Thus, the fastener can be removed as easily as it is installed,
being loosened in the workpiece by one stroke of the handle 11 of
the tool.
In some instances, the fastener 97 is attached to the workpiece so
as to provide for floating movement. As shown in FIG. 17, the
opening 110 in the workpiece 111 is oversize, being larger in
diameter than the section 112 of the sleeve member 98 that extends
through the workpiece. The flange 101 is bent over a washer 113,
which is larger than the diameter of the opening 110, and overlaps
the surface 114 of the workpiece 111. A similar washer 115 is
provided on the opposite side 116 of the workpiece. Therefore, the
flange 101 and the shoulder 102 secure the fastener 97 to the
washers 113 and 115 which connect it to the workpiece 111. The
diameter of the opening 110 being larger than the portion of the
fastener extending through it means that the fastener is capable of
lateral movement relative to the workpiece 111.
In order for this lateral movement to be permitted, however, there
must not be too much compressive force on the washers 113 and 115.
If the washers are squeezed tightly against the surfaces of the
workpiece, the friction will resist lateral movement of the
fastener so that the floating action will not be sufficiently free
or cannot take place. As a result, for such installations, it is
necessary to assure a certain amount of looseness at the connection
to the workpiece 111. This, too, is accomplished by the device of
this invention utilizing the adapter described above.
The adapter is attached to the forward end of the tool, modified,
however, through the installation of a spacer disk 117. This spacer
is annular in construction, so that it has a central aperture 118
that receives the compression spring 95 when the spacer 117 is
installed within the outer sleeve 80. Intermediate the end disk 89
and the end wall 85 of the member 84, an opening 119 in the spacer
parallel to the axis receives the alignment pin 93. The spacer 117
is slightly shorter than the distance between the end disk 89 and
the wall 85 of the inner sleeve 84. Therefore, with the spacer 117
adjacent the end disk 89, there is a smal gap 120 between the
spacer and the wall 85.
In loosening the fastener 97 from the position of FIG. 17 to allow
the lateral floating movement, the tool is associated with the
fastener similarly to the manner in which it is engaged for
removing the fastener. Thus, the end wall 81 of the outer sleeve 90
of the adapter is placed adjacent the washer 115, while the end
wall 86 of the inner sleeve 84 is next to the shoulder 115 of the
outer sleeve 106 of the fastener. The handle 11 then is rotated
relative to the housing 10 of the tool to shift the end wall 86
relative to the end wall 81. This pulls outwardly on the sleeve
member 98 of the fastener. However, the amount of movement is small
and limited by the spacer 117. The sleeve 84 can move only until
the small gap 120 between the spacer 117 and the end wall 85 is
closed and the end wall 85 is brought into contact with the spacer
117. This position of the tool is illustrated in FIG. 18. Such
limited movement, therefore, does not separate the fastener from
the workpiece 111. Instead, it straightens a small section of the
flange 101, but the flange still overlaps the washer 113 to hold
the fastener to the washer, which, in turn, keeps the fastener on
the workpiece. However, the compressive force between the washers
113 and 115 is relieved, so that now there is a loose connection
and the fastener easily floats in a lateral direction as desired.
Thus, the tool of this invention has still another capability with
a very simple modification to its assembly.
In some instances, the tool of this invention may be used in
forming a flange on a part which has a knurl or other projection on
the periphery of the portion of it that is received in the opening
in the workpiece. This may be, for example, a nut which should be
held against rotation to avoid the requirement for the use of a
wrench to prevent it from turning as the bolt engages it. In the
design shown in FIG. 11, where the nut 74 has only a straight
cylindrical portion 75 extending through the opening in the
workpiece 76, it is not secured against rotation relative to the
workpiece 76. With that design, it is necessary to employ a wrench
to prevent the nut from rotating when a bolt is threaded into it.
This not only is inconvenient, but may be impossible where the nut
is positioned in an inaccessible location. The nut 122 shown in
FIGS. 20, 21 and 22 does not have this shortcoming, being provided
with an externally toothed portion which becomes embedded in the
material of the workpiece around the opening, which locks the nut
against rotation relative to the workpiece.
The nut 122 includes a portion 123 of cylindrical exterior, beyond
which is a similarly contoured section 124 of smaller diameter. A
radial shoulder 125 is provided between the sections 123 and 124.
Projecting radially beyond the circumferential surface of the
section 124 is a knurled section 126. This has a straight knurl
extending longitudinally of the nut. This knurl may extend to the
shoulder 125, which is important where the nut is to be attached to
a thin panel, as discussed below.
Within its interior, the nut includes a threaded opening 127
through the portion 123, which connects to a larger unthreaded bore
128 in the section 124. This provides the end of the device with a
relatively thin wall to permit it to be bent outwardly in producing
a flange. Thus, as seen in FIG. 21, the device is extended through
an opening 129 in a workpiece 130, while the outer end of the
section 124 is bent over the workpiece to form a flange 131. This
flange cooperates with the shoulder 125 in retaining the nut 122 to
the workpiece 130 and preventing axial movement. Moreover, the
teeth defined by the knurled section 126 become embedded in the
workpiece around the opening 129 through it, thereby locking the
nut 122 against rotation. Consequently, the nut 122 is held against
any movement relative to the workpiece 130, and may be engaged by a
bolt in completing an attachment for the workpiece 130. The bolt
passes freely through the end bore 128, which is larger than the
major diameter of the threaded opening 127.
With the knurl 126 extending all the way to the shoulder 125, the
nut 122 may be associated with a thin panel and still be locked
against rotation. Regardless of the thickness of the workpiece at
the opening, the knurl will remain in engagement with the workpiece
to hold against rotary movement. If the knurl were spaced from the
shoulder, as in the designs of the prior art, it would pass all the
way through a thin panel rather than staying embedded in the
material. Also, such earlier designs relied upon the flow of the
material of the workpiece in back of the knurl to provide an
interfering surface to prevent the nut from being displaced
axially, and, therefore, required the outward spacing of the knurl.
This has not been satisfactory, even in thicker parts, resisting
very little force and having nowhere near the strength of the
flange 131 that holds the nut of this invention. These prior
designs are completely inoperative for material that will not flow,
such as plastic, while the present invention holds equally well in
all materials.
The installation of the nut 122 poses a problem in that it is
necessary to apply an axial force to it in moving the knurled
section 126 into the opening 129 in the workpiece 130. This is
required because the teeth of the knurl must cut into the workpiece
to provide the means for locking against rotation. In utilizing the
flaring tool as arranged in FIG. 11 with a knurled nut, the tool
simultaneously will draw the nut into the opening into the
workpiece and bend the end outwardly to form the attaching flange.
This means that a tight connection will not be obtained and that
there will be a looseness between the flange 131 at the end of the
section 124 and the shoulder 125, as the nut will not tightly grip
the workpiece. However, with the use of the attachment illustrated
in FIGS. 23 through 26, the tool can install the nut 122 in a
two-stage operation, first pulling it into the opening in the
workpiece and then bending over the flange. This avoids premature
bending of the flange and assures that the workpiece is gripped
firmly between the flange and the shoulder 125.
At the forward end of the tool, as shown in FIGS. 23 through 26, is
a spacer 133, which is a transverse flat plate that includes a slot
134 extending into one side of it. The slot 134 in the spacer 133
is circular in its inner contour and dimensioned to receive the
circular periphery of the forward portion 135 of the die member
136. The spacer 133 is pivotally connected to a bracket 137, which
is adajcent but inwardly of the forward end of the tool. The
bracket 137 has an opening receiving the cylindrical portion 138 of
the die member 136, so that it is held against the forward threaded
end portion 40 of the tubular member 12 by the shoulder 139 of the
die member. One end of a screw 141 extends perpendicularly through
the spacer 133, while the opposite end is threaded into the end
wall 142 of a knob 143. The screw 141 is received within a tube 144
which extends rotatably through an opening 145 in the bracket 137
and at its ends engages the spacer 133 and the wall 142 of the knob
143. This couples the spacer 133 to the knob 143 so that rotation
of the latter member will pivot the spacer 133 relative to the
bracket 137.
The spacer 133 is urged toward the bracket 137 by a compression
spring 146, which is interposed between the bracket 137 and the
wall 142 of the knob 143. Therefore, the bracket may be positioned
as shown in FIGS. 23 through 26, where the forward portion of the
die is received in the slot 134 and the spacer extends around the
die, or it may be moved to a position remote from the die as seen
in phantom in FIG. 24. In the former position, the spring 146 holds
the spacer 133 against the surface 147 of the die member. When the
spacer 133 is to be moved away from the die, it is swung free and
moved axially of the tool by the spring 146 to where it engages the
bracket 137 and is shifted inwardly of the forward end of the die.
This movement is accomplished by rotating the knob 143, which is
conveniently done by the thumb engaging the knurled outer wall 148
of the knob.
In installing the nut 122, the spacer 133 initially is positioned
around the forward portion 135 of the die member 136. The nut 122
is positioned with its tubular end portion extending into the
opening 129 in the workpiece 130, but with the knurled section 126
exteriorly of this opening. The stud 77, which extends forwardly
from the member 33 that is connected to the slide 25, is threaded
into the opening 127 of the nut 122. Then, the tool is operated in
the usual manner by rotating the handle 11. This exerts an axially
inward pull on the nut 122, forcing the knurled section 126 into
the opening 129 and bringing the shoulder 125 into engagement with
the surface 151 of the workpiece around the opening 129. As this
movement of the nut 122 takes place, the end of the section 124 of
the nut remains clear of the end of the die member 136. This is
because the parts are proportioned so that the end of the die
member is spaced away from the adjacent surface 152 of the
workpiece 130 by the spacer plate 133. This spacing is such that
the movement of the nut into the opening in the workpiece has no
effect upon the bending of the flange.
After the nut has been shifted to the position of FIG. 26, the
spacer is moved away from the die and the flange 131 is formed.
This is accomplished by first rotating the tool relative to the
stud 77 to loosen it sufficiently to allow the spacer 133 to be
shifted outwardly past the die 136 and then rotated and moved in
the opposite direction to its remote position. The tool then is
rotated in the opposite direction to bring the die into adjacency
with the end section 124 of the nut. With the spacer 133 out of the
way, the end of the die then engages the tubular end of the nut 122
and forms the flange 131 on the next stroke of the handle 11. As a
result, the workpiece 130 is held tightly between the shoulder 125
and the flange 131.
The forming groove of the die 136 is modified slightly from that of
the groove 45 of the die 39 described above. The die face is
recessed to provide a single outwardly facing arcuate surface 153,
generated by a segment of a circle, outwardly of which is a radial
surface 154. This groove configuration cause the flange 131 to be
radial when it is formed, with its outer portions extending in the
same directions as the flat surface 154 of the die. The annular
groove 45, on the other hand, with its return bend at the outer
portion of the groove, tends to provide the flange with a slight
curl rather than causing all portions of the flange to lie flush
against the surface of the workpiece.
The tool also may be used in securing a sleeve or a fastener to a
part of honeycomb sandwich construction or of other compressible
material. The honeycomb panel 156 shown in FIG. 29 is conventional,
including other panels 157 and 158 between which is a core 159 of
honeycomb material. Normally, the outer panels 157 and 158 are of
metal, while the core 159 may be of plastic, metal or other
suitable material. In order to attach a sleeve in the honeycomb
panel or to secure a fastener to it, there first is drilled an
opening 160 that extends through the other panels and the core
159.
Next, there is inserted into the opening 160 an assembly 162 made
up of a sleeve 163 and a stud 164. The latter member has a flush
head 165 and a shank 166 threaded at its outer end. The sleeve 163
is generally comparable to the tubular collar 51 described above,
having a cylindrical exterior surface 167 and a cylindrical bore
168 through which the shank 166 of the stud 164 slidably fits. An
enlarged bore 169 is at one end of the sleeve 163 for providing a
thin-walled section which can be bent outwardly to form an
attaching flange. At the opposite end of the sleeve 163 is a head
170 which is frustoconical to provide a flush-head configuration. A
frusto-conical recess 171 in the end of the sleeve is dimensioned
to completely receive the head 165 of the stud 164.
The assembly 162 first is associated with the honeycomb panel 156
in the manner shown in FIG. 29. The sleeve 163 fits into the
opening 160, but the head 170 is of larger diameter than the
opening 160 and so cannot extend into it. With the assembly 162
positioned in this way, the stud 164 is associated with the tool by
threading the end of the shank 166 into the opening 37 in the
member 33, as shown in FIG. 30.
Then, upon actuating the handle 11, the member 33 is shifted
axially to the right as the device is shown, pulling on the shank
166 of the stud 164. This, through the head 165 of the stud,
bearing against the recess 171 in the head 170 of the sleeve 163,
causes an axial force to be exerted on the sleeve 163. This forces
the head 170 of the sleeve 163 axially inwardly against the panel
157 of the honeycomb assembly 156. This force is made sufficient to
exceed the yield point of the core 159 and to deflect the panel
157. Therefore, the core 159 becomes crushed locally beneath the
head 170, permitting the head 170 to move inwardly with respect to
the honeycomb panel 156. As this movement of the head 170 takes
place, the panel 157 is bent inwardly around the periphery of the
opening 160, providing an inwardly inclined frustoconical portion
174, as shown in FIG. 31. The stud 164 is moved by the member 33 an
amount sufficient to cause the sleeve head 170 to create a recess
in the panel 157 of a depth such that the head is entirely received
within it. In this way, the outer surface of the head 170 is made
flush with the outer surface of the panel 157. Therefore, as the
handle 11 is actuated, the force exerted on the sleeve 163 causes a
dimple to be formed in the panel 156 to receive the head 170 of the
sleeve.
At the same time, as the die 136 is forced axially inwardly against
the sleeve end and the flange 175 is formed, the panel 156 becomes
deflected inwardly on its opposite side. The flange 175 compresses
and bends the core 159 and the panel 158, producing a more shallow
recess 176 that receives the flange 175. As a result, the flange
175 is made flush with the plane of panel 158.
The assembly 162 may be left in this position upon separation of
the tool from the threaded stud 164, with the stud 164 extending
through the sleeve 163. Alternatively, the stud 164 may be removed
from the sleeve 163, leaving the sleeve in the honeycomb unit 156
to act as a grommet or bearing, as shown in FIG. 32.
In order to bring the head 170 of the sleeve precisely into a flush
relationship with the panel 157, the travel of the member 33 and
hence that of the stud 164 should be limited. If no such provision
is made, it is possible to move the stud 164 too far, causing the
head 170 to be forced inwardly relative to the panel 157 to a
position where the head 170 is recessed beneath the panel of the
panel 157 so that it is no longer flush with the panel surface. It
then would depend upon the skill of the operator to rotate the
handle 11 only the exact amount needed to cause the head 170 to be
brought inwardly to a flush position.
The travel of the member can be limited to correct this merely by
rotating the nut 29 to bring it inwardly closer to the slide 25
that is attached to the member 33. This position is shown in FIG.
31. Then, when the handle 11 is actuated, the end 26 of the slide
25 will contact the protuberance 28 of the nut 29 after the slide
has moved a predetermined distance. In this manner, the tool can be
adjusted to cause the member 33 to move an appropriate amount,
depending upon the dimensions of the parts involved. With the nut
29 used to provide a positive stop in this manner, the overload
spring 20 and its associated mechanism may be eliminated, if
desired.
The foregoing detailed description is to be clearly understood as
given by way of illustration and example only, the spirit and scope
of this invention being limited solely by the appended claims.
* * * * *