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I June 29, 1948.
J. ROSAN
2,444,145
INSERT AND USE OF SAME
'
, Filed May 24, 1943
s Sheets-Sheet 1
3nventor:
JOSEPH £905,403
5"
I
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'
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'
Jame 29, 194$.
'
.1. ROSAN
2,444,145
INSERT AND USE' OF SAME
Filed May 24, 1943
3 Sheets-Sheet 2
47345 1
62'
629227316 _
57a
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61 a
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Snventor:
c/OSZ-‘PH Pas/1 /v,
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Qttorneg.
2,
J. ROSANI
‘
2,444,145
INSERT AND USE OF SAME
Filed May M, 1943‘
'
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3 Sheets-Sheet 3
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62d
Juvenior;
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2,444,145 '
_ umriao sTArEs2,444,145
' PATENT’, orFicE
mean-r AND use 0F some
Joseph m, North Hollywood, Calif. .
Application M424, 1943, Serial No. 488,169
14 Claims. (Cl. 29-148)
. ,
This invention relates generally to‘inserts de
signed for anchorage in bores 01 bodies of rela
tively soft materials, for such typicalypurposes as
making various connections with such bodies, as
z
the insert shown in Fig. 5 and showing the look
ing ?ange before and after de?ection into locking
position;
'
'
A
>
Fig. 8 is a view, with a quarter-section removed,
of another form or insert in accorldance with the
invention, and showing also a spinning tool em
ployed in installing same;
Fig. 9 is a detail view showing the locking ?ange
for instance providing a secure mounting tor a
screwthreaded stud in such a body.
with the recent advent of widely extended use
of many types of relatively soit'foodles in con
struction, particularly in theaircraft industry,
the problem~ of providing secure connections or 10
,
‘after de?ection into locking position;
Fig. 10 is a plan view of another modi?ed form ‘
anchorages to such bodies has become acute anld
of the invention;
,
has received much attention. Such relatively.
Fig. 11 is a section on line H-ll of Fig. 10;
soft bodies as I have reference to include alumi
Fig. 12 is a detail of a portion of the insert of
um and magnesium alloys, plastics, woods, etc.
Figs. 10 and 11, showing the locking ?ange in
15
Particularly in the case of aircraft construction,
locking position;
where the fastening is subject to constant vibra- _
Fig. 13 is a plan view of another modi?ed form
I “ my action, assurance must be provided‘that the
of the invention; and
by longi
' insert will not loosen and fail either
tudinal displacement or by rotation.
'
‘
-
- The object of the present invention is to pro
vide a simple, one-piece insert, of inexpensive
construction, capable of forming a permanent
anchorage in a relatively soft body {or such a typ
20
Fig. 14 is a view, with a longitudinal quarter
section removed, oi’ another modi?ed atom of the
invention.‘
‘
Reference being had to Figs. 1 to 4, numeral ll
designates generally a bo'dy of relatively soft
material, such as aluminum or magnesium alloy,
ical fastening element as a screwthreaded stud.
plastic, or the like. having. an outer suriace ii.
25
In accordance with a preferred form of the
When I speak of a body of relatively soft mate
.- invention, the insert, which isf'designed for inser
rial, it will be understood of course that 1 refer to
tion and anchorage within a bored and counter
a body which is of a material softer than that oi
bored body, embodies an externally screwthread
the insert. The insert is constructed of some
ed cylindrical body receivable in and screw- 7 suitable relatively hand material such as mild or
threadedly engageable with the said bore. The 30 heat-treated steel, brass, bronze, etc. As illus
insert body has at its outer end an integral ?ange,
trated, the body 5|! is formed with a screwthread
serrated on its periphery, anid-oi an initial diam
ed bore 53, extending inwardly from outer sur
eter such as may be readily received_within the
face SI, and with an enlarged counterbore '4,
counterbore.‘ This integral ?ange is adapted to
extending inwardly from surface 5| to a pre
be radially expanded, after the tubular body has 35 determined depth, said counterbore 54 affording
been screwed home, to cause its periphery to en
sage and bite into the walls of the counterbore
and thereby lock the device against rotation.
> an outwardly facing annular shoulder 55 at its
juncture with bore 53.
.
The insert body, in this instance of generally
' The present invention in several typical em
tubular form, is designated generally by numeral
bodiments will now be described in detail, ref 40 so, and is provided preferably with a central lon
erence for this purpose being held to the accom
gitudinal screwthreaded bore 51', adapted to re
panying drawings, in which:
ceive a sc-rewthreaded stud or the like. The in~
Fig. l is a top plan view of another form of in:
sert body has an inner or forward portion or sec
sert in accordance with the invention; _
tion 58 having external screwthreads 59 adapted
Fig. 2 is a section on broken-line 2--2 of Fig. l, 45 for engagement with screwthreaded bore‘53, and
_ showing the insert partially installed inabody of}
with an outer or rearward head portion includ
relatively soft material; ,
,
ing an‘ integral annular ?ange or annulus 60 ini
Fig. 3 is an enlarged detajil of a portion of
Fig. 2;
tially extending rearwardly and outwardly from
,7
its rearward end portion at an angle of about
Fig. 4 is an enlarged detail similar to Fig. 3, but 50 30°, or about as typically illustrated in Figs. 2
showing the insert in its ?nal locking position;
and 3 of the drawings, The head or rearward
Fig. 5 shows a modi?ed form of insert in ac
cordance with the invention, the view being taken '
.end portion of the ‘insert body also preferably
includes an annular outwardly extending ?ange
in an aspect similar to Fig. 6;
ti receivable in said counter-bore 54 and adapted
Figs. 6 and '7, are detail views of a portion of 55 to seat against counterbore shoulder 55 when the
‘ 2,444,145
Q insert is screwed home in bore 58. The parts
are so dimensioned that when ?ange 8| is seated
on shoulder 55,’ the upper or rearward end of the
insert body is preferably ?ush with the surface
5| of body 50. At the same time. the peripheral
or rim portion or the flange, 60 is above the sur
face 5! and may partially overhang or extend
4
of the device illustrated in Figs. 1 to 4. For con
venience, members of the embodiment of Figs.
5 to 7 corresponding to members of the embodi
ment of Figs. 1 to 4 are identified by like nu
merals but with the sub-letter a annexed. The
body 50a again has a screwthreaded bore 53a and
an-enlargedcounterbore 54a, and the insert body,
designated generally-by numeral 56a. has a. cen
radially outwardly beyond the wall surface de
tral screwthreaded bore 510, an inner portion or
?ning the counterbore 54. This peripheral or rim
portion of the ?ange 60 comprises a multiplicity 10 section 580. having external screwthreads 59a
adapted for engagement with screwthreaded bore
of serrations 62. In the speci?c embodiment il
53a, and has an outer or head portion including
lustrated in Figs. 2 and 3, the lines 63 at the bot
an annular ?ange. or annulus 60a initially ex
toms of the valleys or dihedral angles between
tending upwardly and outwardly from its outer
the individual serrations are'parallel to the cen
tral axis of the insert body when the ?ange 60' 15 end at such an angle as typically illustrated in
Figs. 5 and 6 of the drawings. The head or outer
is in the initial position of Figs. 2 and 3. The
end portion of the insert body also preferably
undersides of the serrations are de?ned by inner
includes an annular outwardly extending ?ange
surfaces 64 forming continuations of the under
61a receivable in the counterbore 54a and adapt
sides of the ?ange 60, intersected by outer-sur
ed to seat against the inner end of the counter
faces 65 formed in a plane initially at substan
bore when the insert is screwed home. The ?ange
tially right angles to the central axis of the in
Sla is of somewhat smaller diameter than the
sert (Fig. 3); also, the ridges of the serrations .
?ange 6| of the previously-described embodi
are formed substantially at right angles to the
ment, being only of su?lcient diameter to assure
?anges 60, so that each such ridge has a sub
stantially triangular face 66, with its apex down. 25 a good support for the insert body on the shoul
The individual serrations 52 as so formed are ef
iectlve cutting tools, adapted to cut or broach
grooves in the material of the body 50 upon down
ward de?ection of the ?ange 60 from the posi
tion illustrated in Figs. 2 and 3.
‘
The insert having been screwed into the po
sition shown in Figs. 2 and 3, it is then locked
in position in the body 50 by de?ecting or bend-
der at 55a.
.
The periphery of the ?ange 60a has serrations
62a. The ridge lines 80 of these serrations 62a,
and also the lines ill at the bottoms of the valleys
80 or dihedral angles between the individual serra
tions, are in this instance formed preferably at
substantially right angles to the ?ange 60a, and
are in planes passing through the central longi
tudinal axis of the tubular insert body.
the position of Fig. 4. This may be accomplished 35 To facilitate the de?ection of the ?ange 60a.
it is here shown as weakened ‘at a point near its
by any appropriate means or method of applying
juncture with the insert body proper by the pro
pressure to ?ange 60. Any appropriate or suit
vision of a'channel or groove 83 on its underside.
able drive tool‘ or hammer may be employed‘, or
The insert body having been screwed into the
the ?ange may be de?ected by a spinning oper
ation, employing a spinning tool of a general type 49 position shown in Figs. 9 and 10, it is‘ther. locked
in position in thebody 600. by de?ecting the ?ange
.such as is illustrated in i2, and described here;
60a from the position of Figs. 5 and 6 to the posi
inafter. To facilitate the de?ection of the ?ange
tion
of Fig. 7. Again, any appropriate means or
60, it may be shaped or weakened in various ways;
method of applying pressure to the ?ange to ac
in Fig. 3, for example, the ?ange is for this pur
pose shown as provided on its upper surface with 45 complish this end may be employed. As the ?ange
is de?ected from the position of Fig, 6 to the posi
a groove or channel ‘Ill located near its juncture
tion of. Fig. '7, the serrations 62a bite into the
with the insert body proper. The weakened sec
material 50a around the counterbore 54a, cutting
tion resulting encourages de?ection or bending
or breaching grooves therein, and removing chips,
, of the ?ange in the region‘ near the insert body,
as indicated at ‘I la in Fig. 7. .
, and permits the ?ange to be readily depressed to
In Figs. 10, 11 and 12 is illustrated an embodi
the position of Fig. 8.
_
.
ment of the invention similar to that appearing in
In the course of the described de?ection of
Figs. 5, 6 and 7, and whose parts are indicated by
the ?ange 60 from the position‘ of Fig. 3 to the
. ing the ?ange 60 from the position of Fig. 3 to
position of Fig. 4, the serrations 82 bite into the
material 50 around the counterbore 5!, cutting
' or broaching grooves therein, and removing chips
from the material. as indicated at ‘H in Fig. 4.
The insert is thus securely locked in the mate
rial of the body 50,_the screwthreads on its inner
the same reference numerals as have been applied
to the form of Figs. 5 to 'l, but with the sub-letter
b substituted for the sub-letter a. The principal
modi?cation‘ illustrated in Figs. 10 through 12 is
the use of elongated slots 90 formed in the ?ange
6% at its base or root section, so as to encourage
portion looking it against longitudinal dis 60 or facilitate de?ection, of the ?ange from the
initial position of Fig. 11 to the locked-in position
placement, and the serrations 62 on its outer por
of Fig. 12‘.
-‘
_
tion securing it against torsional displacement.
The function of the ?ange 6| seating on the
shoulder 55 is to support the insert body extend
ing inwardly therefrom in a solid and positive
manner during the hammering of the ?ange 60
from the position of Fig. 3 to locked-in position
of Fig. 4, thereby eliminating the impact that
Fig. 13 is a plan view of an insert of modi?ed
construction, which may again be regarded asvof
the general type as disclosed in Figs. 5 to 7, but
with a, modi?ed means for encouraging or facili
tating the de?ection of the ?ange, designated in
this instance by the numeral 600. It will of course
be understood that this ?ange 60c initially extends
would otherwise be transmitted from the exter
nal screwthreads of the insert body to the body 70 upwardly and outwardly from an internally and
externally screwthreaded body, of the same gen
of relatively soft material 50. Without such pro
eral type as appears in, for instance, Figs. 5 to 7.
tection. the hammering action incident to the de-.
The ?ange 600, provided with the usual peripheral
?ection of the ?ange 60 may tend to loosen the
.serrations 62c, is in this instance formed with
threads 59 in the screwthreaded bore 53.
Figs. 5, 6 and 'I show a somewhat modified form 75 radial slots 94 extending inwardly from its ser
9,44%,146
rated periphery to a point adiacentthe region of
bowed ?ange by exerting downward pressure up
luncture with the tubular portion of the ‘insert
on it. ‘Fig. 9 shows the ?ange I02 after having
body proper. These slots or notches 84 sever the ’ ‘ beenso ?attened, and illustrates the serrations
?ange into a number of projecting parts 95. which
I03 as having been forced well inside the mate
may be de?ected with somewhat increased facility 5 rial of the body lile around the counterbore Me.
as compared with a complete, unbroken ?ange.
This ?attening of the ?ange It! may be accom
Fig. 14 illustrates one further expedient in ac?
plishedby any appropriate means or method of
cordance with the invention designed to facilitate
applying the necessary pressure thereto. Any
‘ de?ection of the ?ange and at the same time to
appropriate‘ drive tool or hammer may be em
relieve the threads from the full effect of the im
pacts incident to the bending of the ?ange down-l
wardly into locking position. Excepting for omis
10 ployed, or the ?ange may be ?attened by aspin- ’
ning operation, employing a spinning tool “ll
of the general type shown in Fig. 8. This spin
sion of the ?ange Ola and of the weakness groove
ning tool typically comprises a central shaft ill.
38, the insert of Fig. 14 is in general respects sim
which is receivable inside the central bore of the
ilar to the insert of Figs. 5 to 7, and its parts will 15 tubular insert body,.and which is adapted to be
accordingly be designated by similar reference
rotated by any suitable or usual power-driven
numerals, but with the use of the sub-letter d in
the case of Fig. 14. vA slightly modi?ed form of,
rration is disclosed in Fig. 14, the serrations 62d
means, not illustrated, and two arms or wings H3
extending oppositely from the shaft III, which
arms are adapted to engage the upwardly bowed
being extended downwardly slightly‘ below the 20, ?ange I02. By exerting downward pressure on
plane of the undersurface of‘ the ?ange 60d. and
this spinning tool as it is rapidly rotated, the
the undersides of the serrations being raked some
what, is indicated at 81, to facilitate the cutting
initial bowed pro?le of the ?ange is readily re
moved and the ?ange ?attened out to the position
‘ action of the serrations as they are driven into the
illustrated in Fig. 9, with its peripheral serra
material of the body 50d. A washer 98 is placed 25 tions I02 forced into biting engagement with the
on the shoulder Bid at the bottom of counterbore
body 50. Such a spinning operation is often su
Nd. and is so formed as to engage the underside
of the ?ange 60d at a point near the juncture of
the latter with the outer end portion of the insert
' perior to a hammering or impact operation, for
the reason that it is relatively dimcult to accom
plish a uniform de?ection or expansion of the
bodyproper. The-position of the ?ange 80d after 30 ?ange by a hammering operation, whereas ‘uni
being bent downwardly into locking engagement
form movement of the metal of the ?ange is very
with the body 50d, is not illustrated in the draw‘
readily obtained by - the described spinning
ings, but will be understood to be similar to that
operation.
.
I
shown for instance in Fig. 4. As the ?ange 80d is
It will be evident that the serrated ?angesof
so bent downwardly, it ,tends to fulcrum on the 35 the types of inserts disclosed in ‘Figs. 1-7 may
washer 98, thus facilitating the bending action,
also be de?ected into locking position by similar .
and at the same time, the washer 98 supports the
spinning operations. A spinning tool similar to
?ange 60d from thes'houlder 55d, and so reduces
that shown inv Fig. 8 may be employed for this
thetransference of the impacts incident to the
purpose, and by exerting downward pressure
hammering of the ?ange 60d into its ?nal locking 40 thereon as it is rotated, the ?ange is gradually
position, downwardly to the threaded connection
and uniformly moved down into thedesiredlock
ing position.
' ‘
between the insert body and the body of material
did.
-
I
From the above description of several typical
.
Figs. 8 and 9- illustrate a further modi?ed form
illustrative forms of the invention. the underly-'
of insert within the scope of the invention, and 45 ing principles thereof will be readily gathered.
also illustrate the use of a spinning operation for '
It is of course to be understood, however, that
de?ection of the locking ?ange, which spinning,
the particular embodiments of the invention '
operation is also applicable to the embodiments of
herein disclosed are for illustrative purposes only,
Figs. 1-7. The body intowhich the insert is to be
and that various changes in design, structure and
installed is designated generally by numeral We, 50 arrangement may be made therein’ without de
and said body has the usual screwthreaded bore
‘ parting from the spirit and'scope of the inven
83e, and'counterbore Me, though the latter is
tion or of the appended claims.
typically somewhat shallower than is the casein
the earlier described embodiments of the‘ inven
1. Acne-piece insert adapted for insertion and
tion. The insert body is of generally tubular form, 55 anchorage within a bored and counter bored body
having a central screwthreaded bore Hill and an
of relatively soft material, comprising an exter
inner externally screwthreaded section "ll
nally and internally screwthreaded tubular body
adapted for screwthreaded engagement with the
receivable in and screwthreadedly engageable.
bore Me. The outer end portion of the tubular
with the bore in said body of material,- an in- ,
insert body has an annular outwardly extending
tegral bendable ?ange on the rearward portion
head ?ange I02, the peripheral edge of which is
of said insert body having broaching serrations
formed with serrations l 03, extended in directions
on its periphery and adapted to be bent in a di
parallel to the central axis of the tubular insert
rection to enlarge its diameter after said insert is
body. The ?ange Hi2 has an initial upward arch
screwed into said bore'to force said serrations
or convexity I05 as seen in radial section, its root
into biting engagement with said body of mate
and serrated periphery being initially substan
rial around said counterbore, and another in
tlally in the same transverse plane, and the ?ange
tegral ?ange on said insert body located inwardly '
is of such diameter that its serrations I03 are
along the insert body from the ?rst-mentioned
initially freely receivable within counterbore 54a.
?ange and engageable with the bottom of said '
The insert having been screwed into the posi 70 counterbore when the insert body is screwed
. tion shown in Fig. 8, it is then looked in position
home in said bore in said body of material.
in the- body Bile by spreading or expanding the
2. A one-piece insert adapted for insertion and
?ange I02 su?iciently to force the serrations I03
anchorage within a bored and counter bored body‘
into biting engagement with the counterbore
of relatively soft material, comprising an exter
, and this is accomplished by ?attening the 75 nally screwthreaded cylindrical body receivable
_
Iclaim:
'
2,444,145
7
engageable with the bore
in said body of material, an integral, initially out
wardly inclined conical ?ange on the outer por
tion of said insert body having serrations on its
' in and screwthreadedly
-
“
H
‘ its periphery and adapted to be de?ected into a,
. plane substantially at right angles to the central
longitudinal axis of said insert body after said '
I insert is screwed into said<bore to force said ser
periphery and adapted to be de?ected into a
plane substantially at right angles to the central
longitudinal axis of said insert body after said in
rations into biting engagement with said body of
sert is screwed into said bore to force said serra
anchorage within a bored and counter bored body
of relatively soft material, comprising an ex
tions into biting engagement with said body of
material around said counterbore.
'7. A one-piece insert adapted for insertion and
material around said counterbore, and another 10 ternally screwthreaded cylindrical body receiv
able in and serewthreadedly engageable with the
integral ?ange on said insert body located in
bore in said body of material, a screw threaded
wardly along the insert body from the ,?rst
socket in said body opening through the rearward
mentioned ?ange and engageable with the bot
end portion thereof. and an integral ?ange on
-tom of said counterbore when the insert body is
screwed home in said bore in said body of 15 the outer extremity of said insert body having
serrations on its periphery, said ?angehaving
material.
its root and its serrated periphery initially sub
3. A one-piece insert adapted for insertion and
stantially in. the same plane transverse of the
anchorage within a bored and counter bored body
body, and being formed in a radially extending
‘ of relatively soft material, comprising an exter
nally screw threaded cylindrical body receivable 20 arch betweensaid root and periphery, said ser
rated ?ange being initially receivable within said
in and screwthreadedly engageable with the bore
counterbore. and being adapted to be ?attened
_ in said body of material, and an integral, initially
into said transverse plane after said insert has
outwardly inclined conical ?ange on the outer
been screwed to its intended depth to‘ enlarge
portion of said insert body having serrations on
its periphery and adapted to be de?ected into a 25 its diameter and thereby force said serrations
into biting engagement withsaidbody of mate
plane substantially at right angles to the central
longitudinal axis of said insert body after said
rial around said counterbore.
48. A one-piece insert adapted for insertion and
' insert is screwed into said bore to force said ser
anchorage within a bored and counterbored body
' rations into biting engagement with said body
of material around said counterbore, said ?ange '30 of relatively soft material, comprising a cylindri
cal body, an initially rearwardly ?ared conical
having, a weakened section near its point of
v, juncture with said insert body to facilitate said
' ?ange of circular outline integrally joined to said
body near one extremity of saidbody, said ?ange
de?ection.
.
I
4. A one-piece insert adapted for insertion and
having peripheral serrations, and being radially
- anchorage within a bored and counter bored body
_ expansible by transverse bending independent of
of relatively soft material, comprising an exter
movement of said body, screw threads on the ex
nally screwthreaded' cylindrical body receivable
terior of said body between said ?ange and the
in and screwthreadedly engageable with the bore
other extremity of said body, said screw threads
, in said body of material, an integral ?ange on the
being engageable with said bore in said body of
outer portion of said insert body having serra 40 material, and said ?ange being radially expansi
tions on its periphery and adapted for de?ection
ble after said body is screwed into said bore in
after said insert is screwed into said bore to force
order to force said serrations into the wall of said
said serrations into biting engagement with said
counterbore, and a screw threaded surfaceon
body of material around said counterbore, said‘
said body accessible on the opposite side of said
?ange having a weakened section near its point 45 ?ange from the ?rst-mentioned threads on said
of juncture with said insert body to facilitate » . body for attachment of external fastening means.
said de?ection, and another integral ?ange on
9.‘ A one-piece insert adapted for insertion
said insert body located inwardly along the in
and anchorage within a bored and counter
sert body from the ?rst-mentioned ?ange and
bored body of relatively soft material, comprising
engageable with the bottom of said counterbore 50 a cylindrical body, a ?ange of circular outline
when the insert body is screwed home in said
integrally joined to said body near one extrem
bore in said body of material.
ity thereof and having peripheral serrations, said
5. A lock-type insert formed of metal and hav
?ange having its root and its serrated periphery
ing a forwardly-extending tubular body-provid
‘
ing external threads for threaded engagement 55
‘with a bore of a receiving member, the rear por
tion of said tubular body ?aring outwardly and
initially substantially in the same plane trans
verse of the body and being formed in a radially
extending arch between said root and said pe
riphery, sa'id ?ange ‘being initially receivable
rearwardly to provide a, ?ange ?aring at an
within said counter-bore and expansible by the
. angle in the neighborhood of 60° relative to the
application of force to ?atten said arch, screw
axis of said tubular body, the outer portion of 60 threads on the exterior of‘sald body between said
said ?ange providing a roughened Peripheral sur
face tapering inwardly and rearwardly, said
?ange being deformable into a more radial posi
tion of larger peripheral size when pressure is ap
plied thereto in a forward direction.
6. A one-‘piece insert adapted for insertion and
anchorage within a bored and counter bored body '
of relatively soft material, comprising an exter
nally screwthreaded cylindrical body receivable
?ange and the other extremity of the body, said
screw threads being engageable with said bore in
said body of material and said ?ange being radi
ally expansible after said body is screwed into said
bore in order toforce said serrations into the
wall of said counter-bore, and a screw threaded
surface ‘on said body accessible on the opposite
. side‘ of said ?ange from the ?rst-‘mentioned
threads on said body for attachment of external
in and screwthreadedly engageable with the bore 70 fastening means.
'
'
'
in said body of material, a screwthreaded socket
~ 10. The method _of installing in a bored and
in said body opening through the rearward end
counterbored body of relatively soft material, an
insert comprising a cylindrical externally screw
portion thereof, and an integral, initially rear
threaded body having adjacent one end a locking
wardly ?ared conical ?ange on the rearward end
portion of said insert body having serrations on 75 ?ange with a serrated periphery, which com
2,444,145 '
prises: screwing said insert into the bore of the
10
to ?atten said arch and to‘ expand ‘the-?ange‘ ’
7 body of material and thereafter displacing said
- radially to force its serrations to bite into said 1
?ange by the application of pressure thereto, to
force the peripheral serrations to. bite into said
body of material around said counter-bore.
11. The methodof installing, in a bored and
counterbored body of relatively softmaterial, an
and anchorage within abored and counterbored ,
insert comprising a cylindrical externally, screw
threaded body having adjacentone end an out
wardly inclined conical locking ?ange with a
body of material surrounding said counterbore.
14. A one-piece insert adapted for insertion
body of material, said insert comprising: an;ex
ternally screw threaded shank adapted to be .
screw threaded into said bore; and an integral
?ange at the rearward extremity of saidv insert
and equipped with serrations in its periphery,
said ?ange being initially conical in form and
having a weakened region at its juncture with
said shank, adapted to permit said ?ange'te ?at
ten into a planar form upon axial compression
to expand radially to force said serrations into
15
thewalls of surrounding material.
‘
JOSEPH ROSAN.
serrated periphery, which comprises: screwing
said insert body into the bore in said body of
material, and then applying pressure to said
?ange to uniformly de?ect it into a plane at right
angles to the longitudinal axis of said insert body
and to force said serrations to bite into said body
of material around ,said counterbore.
12.‘The method of installing, in a bored and
counterbored body of relatively soft material, an
insert comprising a cylindrical externally screw. 20
threaded body having adjacent one end a locking
?ange with a serrated periphery which comprises:
screwing said insert body into the bore in said
body of material, and thereafter radially expand
ing said ?ange to force its serrations to bite into 25
- said body of material around said counterbore.
REFERENCES CITED
The following references are of record in the
?le of this ‘patent:
UNITED STATES PATENTS
Number
824,983
1,619,569
1,795,570
1,875,930
13. The method of installing,,in a bored and
counterbored body of relatively soft material, an
2,002,741
insert comprising a cylindrical externally screw
threaded body having adjacent one end a locking 80 2,093,831
?ange with a serrated periphery, said ?ange hav
'
ing its root and its periphery initially in the same
plane transverse of the insert body and being
formed in a radially extending arch between said
root and periphery, which'comprises: screwing 85
said insert. into the bore in-the body of material
and thereby positioning the ?ange in said coun
terbore, and applying axial, force to the ?ange
Number
Name
I
Date
Farrington ________ __ July 3, 1906
Dedouch _____ __.___.. Mar. 1, 1927
Nilson __________ __ Mar. 10, 1931
Martin ___________ __ Sept. 6,1932
Hunt ___.; ________ __ May .28, 1935 ,
Cozzens ________ .1; June 15, 1937
FOREIGN PATENTS
Country
“
Date
'
170,868
464,298
Great Britain _-___'__ Oct. 24, 1921
Great Britain __‘____'_ Apr. 15, 1947
276,786
Great Britain _______ Sept. 8, 1927
2,136,523
Great Britain ____ __ Nov. 15, 1938
,.
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