CA1059806A - Insert - Google Patents
InsertInfo
- Publication number
- CA1059806A CA1059806A CA275,629A CA275629A CA1059806A CA 1059806 A CA1059806 A CA 1059806A CA 275629 A CA275629 A CA 275629A CA 1059806 A CA1059806 A CA 1059806A
- Authority
- CA
- Canada
- Prior art keywords
- insert
- hole
- taper
- leading end
- serrated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Dowels (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An insert for installation in a hole therefor in parent material by relative axial movement of the insert and material with or without the aid of heat such as by high frequency vibration, wherein the insert has a series of external uniform diameter annular peripheral taper portions each tapering down towards the leading end of the insert and longitudinally serrated to provide projections for barb-like retention of the insert in the hole; a reduces diameter pilot portion at the leading end of the insert having an external lip of substantially less diameter than that of the taper portions, which lip engages the hole in order to assist initial axial alignment and contact of the insert with the hole at the commencement of installation of the insert therein. The insert also has a rear plain external annular peripheral taper portion behind the rear-most serrated taper portion and of substantially the same diameter thereof and also tapering down towards the leading end of the insert in order to close the hole and retain parent material therein on complete installation of the insert.
An insert for installation in a hole therefor in parent material by relative axial movement of the insert and material with or without the aid of heat such as by high frequency vibration, wherein the insert has a series of external uniform diameter annular peripheral taper portions each tapering down towards the leading end of the insert and longitudinally serrated to provide projections for barb-like retention of the insert in the hole; a reduces diameter pilot portion at the leading end of the insert having an external lip of substantially less diameter than that of the taper portions, which lip engages the hole in order to assist initial axial alignment and contact of the insert with the hole at the commencement of installation of the insert therein. The insert also has a rear plain external annular peripheral taper portion behind the rear-most serrated taper portion and of substantially the same diameter thereof and also tapering down towards the leading end of the insert in order to close the hole and retain parent material therein on complete installation of the insert.
Description
~5980~i ~his invention relates to inserts o~ the kind which have a serrated or similarly formed exterior to provide a plurality of projections fQr retention of the insert in a hole therefor in parent material and which are in~talled 5. in position of use in a said hole by relative axial movement ;~ o~ the insert and material and, if desired, with the aid of hi~h frequency or ultrasonic vibration of the insert or the application of heat to the latter. Such inserts, usually but not nece~saril~, have a threaded bore or shank f~r 10. receiving a threade~ member such as a screw or nut and for example are widel~ used in components of plastics material.
~he invention has reference more particularly, but not : ~, l~ exclusively, to inserts of the above mentioned kind in ~
, ~i; which at least part of the exterior of the insert is `~ 15~ æerrated by a knurling or similar tool such as the inserts ~;
;, set forth in the specifications of my prior British patents ~ NOB . 1, 230,775 and 1,326,746.
, ,; -~, ~he object of this inve~tion is to provide an improved ~ insert of the above mentioned kind whereb~ installatio~ ~-;-~3 20. is facilitated.
.. : . ~: .
:'' ' , An insert of the character described comprises an exterior ;`
-~ part thereof having a series of annular peripheral taper portions each of the same diameter and each of which tapers ' down from a rear shoulder thereof in a direction towards the `.'J25. leading end of the insert, so tha-t said taper portions are in .
i :.
.. .. :- . . . .. , . ............... - . . . .. .: . : .
:~
~S98~
ba.rb~like formation, each said taper portion being longitudinally serrated with serrations of V-~orm at ~: its rear part to provide a plurality of projections for - retention of the insert in a hole therefor in parent 5. material, the serrations running out with forward : reduction of each taper portion; a reduced diameter cylindrical pilot portion at the leading end of the insert; ~
an external annular lip about the pilot portion closely ~ .
adaacent the leading end o~ said pilot portion and axially ~ ;
10~ spaced along t-he pilot portion from the adjacent taper portion~ which lip is of taper form tapering down towards :,~
.~. the leading end of said pilot portion and is of substantiall~
:: smaller diameter than that of the said series of serrated ;, annular peripheral taper portlons for wall engagement in a 15. said hole in order to assist in maintaining initial axial alignment and contact of the insert with the hole at the commencement of and during installation of the insert .. , :
therein; and a rear plain external annular peripheral taper portion behind the rearmost serrated taper portion and of 2Q. substantially the same diameter thereof and also tapering -~
~: down in a direction towards the leading end of the insert in order to close a said hole and retain parent material ~;
. .
therein on complete installation of the insert~
~"" ~.
In practice the constructio~ and arrangement is as follows, . 25. reference being had to the aecompanying drawings in which:- ;
., .
.1 ~
S~81~6 ~IGUK~ 1 is an elevation of the insert at the commencement o~
` installation.
";~ ~
FIGUEES 2 and ~ are rear and leading end views ;~
respec-tively o~ -the insert.
~rl ` FIGURE 4 is an elevation showing -the insert fully installed, and , ~IGURE 5 is an elevation of a male form -~ of the insert providing a 10. threaded stud. ;~
;~ ~he insert shown in FIGURES 1 to 4 is basically in accordance with tha-t described and shown in the specifications of my prior British patents aforesaid in which the insert 1 is provided with a threaded bore 2 for receiving a screw and is formed on 7l~ 15- its exterior periphery~at 10 with a series of taper portions 6 ~;
x7, ~ each of which forwardly reduce in diameter in a direction towards the leading end of the insert.
:,~:1 ' : : .
ach taper portion 6 is serrated at 7 at its rear part of ~ ~`
greater diameter so as to provlde a pIurallty of projectlons `~
~; 20. 60, the serration 7 r7~nning out with the forward reduction in diameter of the~taper portion 6. Serration 7 of the taper portions 6 can be conveniently effected in practice and to the V-form shown by~a suitable knurling operation. ~- ;
~5~
: ~he taper portions 6 and projections 60 thereof are arranged :~ in buttress or barbed formation so as to provide a series of shoulders 16 each de~ined between the rear end of one taper ~ portion 6 and a leading end of -the next portion~
: 5. ~he insert can be ins-talled by a simple push opera-tion in a - -. -hole 19 of suitable size and depth in parent material such f ' as metal, wood, thermo-setting or o-ther plastics material of :;
.", ;. a component 13. Alternatively it can be installed in thermo-plastic material with the aid of high fre~uency or -10~ ultrasonic vibration or by the application of heat to the .` insert by a thermal gun whereby parent material immediately ;:
` about the inser-t 1 in the hole 19 is temporarily softened ;; or melted so as to run in relation -to the insert 1 for ~:
~ . .
;~ obtaining ~irm securing or encapsula-tion of -the latter in .l 15. the hole af-ter the material has solidified. Such operation , ?, may -take place in only a very shor-t interval of -time eOg.
of about one second or less.
During such irlstallation the insert 1 is received by the hole 19 either by driving the insert into the latter or by ` 20. moving the material relative to the insert whichever is -the ~ :
;: !
~ most convenient in practiceO
~, .
.-;i ~:
. ,, . ,! `
"i, ~:
:', : : ' ': :,' ;`' ' ' . A 4 : ~.. , .,~
. .
,:
, , . . , , , , , , . , . ~
~(~5~3~ ;
For the purpose of such in~tallation and in accordance wi-th this invention, a reduced leading end por~ion OL' ~`
pilot 12 of the insert is provided with an external lip or bar~ 20 shown o~ ~orwardly tapering c~nnular form -5. which is preferably also serrated at 27 to a shallow depth i.e. b~ the same knurling tool during the serration ~-of the taper portion 6. ~hus the serration 27 of the lip 20 is a continuation or witness of the serration 7 on the taper portions 6 while it will be noted that the "
. ,~ .
10. maximum diame-ter of the lip 20 is substan-tially smaIler than the maximum diameter of -the taper portions 6 at 10.
~specially in the case of a cored hole in plastics material ` -e.g~ having a draft angle of the order of 3 inclusive, and on initial introduction of the insert 1 into the hole 19 15~ -the lip 20 contacts the wall of the hole at or adjacen-t ..~
~ the mouth of the latter and thus assists in initially .,.~g ..
~ maintaining axial ali~nment of the insert 1 w~th the hole 19.
`~ ~his is maintained as the insert 1 is driven fully into the hole 19 where the lip 20 also provides positive location at 20. the bottom or lnner end o~ the hole. As a result the ~;~
~, ~ tendency of the insert to pivot or rock out of axial alignment, ....................................................................... .
~:r: ~ : ~uring installatlon is avoided or very greatly minimiséd~
~ In the case of ultrasonic ins-tallation or by means of a :s~, thermal gun, mol-ten parent material is able to flow over ~ -25. the lip 20 and about the taper portions 6 in obtaining secure installation of the insert in the hole. Owing to ~,J~
5- : ~
~ ., : ., i`' -. ....................................................................... .
~S9~06 -:
-the buttre~s or barb like formation of the taper portions 6 and projections 60, the insert 1 has a high resistance to axial pull-out load when ins-talled in parent ~aterial, whils-t the serration 7 of the 5. taper portion 6 also resists -the tendency of the inser-t to rotate relative -to the parent material when the insert is under torsional load.
.':
~he insert is also shown provided with a rear taper g portion 26 of plain annular form tapering down in the 10. same direction as the taper por-tions 6 i.e. towards the leading end of -the insert 1. -~
'~: ' This plain taper portion 26 is of substantiall~ the same diameter as the taper portion 6 but the taper angle may be of the order of 45 as against 22 of the taper ;1 15. portion 6. However these and any other values quoted ~ herein are given by way of example only and ma~ be varied .';
, according to practical reguirements.
...~
`- The plain taper portion 26 provides an effective stop against the surface of the parent material about the 20. mouth of the hole 19 for providing a suitable finish for ;.~i ~.
aesthetic purposes and also fully closes the hole especially as regards grooves formed in the wall of the ~ ;f latter by the broaching action of the serrated taper ~` portions 6.
- :~
, . , :. .; - . , ~0 ~ 6 Again in -the case of ul-trasonic or -thermal gun installation, the plain taper portion 26 effectively prevents or minimises back spew of mol-ten plastics -~
material from the hole 19 as the installation of the ~` 5. insert 1 is completed.
... .
~ .
' ~
A further practical advantage arises from the fact that the rear face 260 of the plain taper portion 26 provides .
~ a relatively large bearing surface for the horn of ultra~
.. :.:: .
~; sonic installation apparatus or of a thermal installation ~;' 10. gun.
., ~he foregoing features and advantages of the insert are achieved with little or no incr~3ase in the cost of manufacture or production time per insert.
, ,~ .
..... .
~; ~IGUR~ 5 shows an insert body 1 having substantially ~5. the same exterior form as that described including the ;~
provision~of a lip or barb 20 on the reduced pilot ~-portion 12. However instead of a threaded bore, the body 1 is pro~idad with a co-axial threaded shank or .. ,,, ~.
~ stud 22 of reduced diameter extending from its rear end.
,.,, :,: ~
20. ~he formation of the bore 2 or shank 22 of the insert 1 depends on its intended purpose and for example may be of plain form.
,: ....
,,v , ,.. ; :
~ -7~
, ~..... : , . : , ~
.. . . . .
~he invention has reference more particularly, but not : ~, l~ exclusively, to inserts of the above mentioned kind in ~
, ~i; which at least part of the exterior of the insert is `~ 15~ æerrated by a knurling or similar tool such as the inserts ~;
;, set forth in the specifications of my prior British patents ~ NOB . 1, 230,775 and 1,326,746.
, ,; -~, ~he object of this inve~tion is to provide an improved ~ insert of the above mentioned kind whereb~ installatio~ ~-;-~3 20. is facilitated.
.. : . ~: .
:'' ' , An insert of the character described comprises an exterior ;`
-~ part thereof having a series of annular peripheral taper portions each of the same diameter and each of which tapers ' down from a rear shoulder thereof in a direction towards the `.'J25. leading end of the insert, so tha-t said taper portions are in .
i :.
.. .. :- . . . .. , . ............... - . . . .. .: . : .
:~
~S98~
ba.rb~like formation, each said taper portion being longitudinally serrated with serrations of V-~orm at ~: its rear part to provide a plurality of projections for - retention of the insert in a hole therefor in parent 5. material, the serrations running out with forward : reduction of each taper portion; a reduced diameter cylindrical pilot portion at the leading end of the insert; ~
an external annular lip about the pilot portion closely ~ .
adaacent the leading end o~ said pilot portion and axially ~ ;
10~ spaced along t-he pilot portion from the adjacent taper portion~ which lip is of taper form tapering down towards :,~
.~. the leading end of said pilot portion and is of substantiall~
:: smaller diameter than that of the said series of serrated ;, annular peripheral taper portlons for wall engagement in a 15. said hole in order to assist in maintaining initial axial alignment and contact of the insert with the hole at the commencement of and during installation of the insert .. , :
therein; and a rear plain external annular peripheral taper portion behind the rearmost serrated taper portion and of 2Q. substantially the same diameter thereof and also tapering -~
~: down in a direction towards the leading end of the insert in order to close a said hole and retain parent material ~;
. .
therein on complete installation of the insert~
~"" ~.
In practice the constructio~ and arrangement is as follows, . 25. reference being had to the aecompanying drawings in which:- ;
., .
.1 ~
S~81~6 ~IGUK~ 1 is an elevation of the insert at the commencement o~
` installation.
";~ ~
FIGUEES 2 and ~ are rear and leading end views ;~
respec-tively o~ -the insert.
~rl ` FIGURE 4 is an elevation showing -the insert fully installed, and , ~IGURE 5 is an elevation of a male form -~ of the insert providing a 10. threaded stud. ;~
;~ ~he insert shown in FIGURES 1 to 4 is basically in accordance with tha-t described and shown in the specifications of my prior British patents aforesaid in which the insert 1 is provided with a threaded bore 2 for receiving a screw and is formed on 7l~ 15- its exterior periphery~at 10 with a series of taper portions 6 ~;
x7, ~ each of which forwardly reduce in diameter in a direction towards the leading end of the insert.
:,~:1 ' : : .
ach taper portion 6 is serrated at 7 at its rear part of ~ ~`
greater diameter so as to provlde a pIurallty of projectlons `~
~; 20. 60, the serration 7 r7~nning out with the forward reduction in diameter of the~taper portion 6. Serration 7 of the taper portions 6 can be conveniently effected in practice and to the V-form shown by~a suitable knurling operation. ~- ;
~5~
: ~he taper portions 6 and projections 60 thereof are arranged :~ in buttress or barbed formation so as to provide a series of shoulders 16 each de~ined between the rear end of one taper ~ portion 6 and a leading end of -the next portion~
: 5. ~he insert can be ins-talled by a simple push opera-tion in a - -. -hole 19 of suitable size and depth in parent material such f ' as metal, wood, thermo-setting or o-ther plastics material of :;
.", ;. a component 13. Alternatively it can be installed in thermo-plastic material with the aid of high fre~uency or -10~ ultrasonic vibration or by the application of heat to the .` insert by a thermal gun whereby parent material immediately ;:
` about the inser-t 1 in the hole 19 is temporarily softened ;; or melted so as to run in relation -to the insert 1 for ~:
~ . .
;~ obtaining ~irm securing or encapsula-tion of -the latter in .l 15. the hole af-ter the material has solidified. Such operation , ?, may -take place in only a very shor-t interval of -time eOg.
of about one second or less.
During such irlstallation the insert 1 is received by the hole 19 either by driving the insert into the latter or by ` 20. moving the material relative to the insert whichever is -the ~ :
;: !
~ most convenient in practiceO
~, .
.-;i ~:
. ,, . ,! `
"i, ~:
:', : : ' ': :,' ;`' ' ' . A 4 : ~.. , .,~
. .
,:
, , . . , , , , , , . , . ~
~(~5~3~ ;
For the purpose of such in~tallation and in accordance wi-th this invention, a reduced leading end por~ion OL' ~`
pilot 12 of the insert is provided with an external lip or bar~ 20 shown o~ ~orwardly tapering c~nnular form -5. which is preferably also serrated at 27 to a shallow depth i.e. b~ the same knurling tool during the serration ~-of the taper portion 6. ~hus the serration 27 of the lip 20 is a continuation or witness of the serration 7 on the taper portions 6 while it will be noted that the "
. ,~ .
10. maximum diame-ter of the lip 20 is substan-tially smaIler than the maximum diameter of -the taper portions 6 at 10.
~specially in the case of a cored hole in plastics material ` -e.g~ having a draft angle of the order of 3 inclusive, and on initial introduction of the insert 1 into the hole 19 15~ -the lip 20 contacts the wall of the hole at or adjacen-t ..~
~ the mouth of the latter and thus assists in initially .,.~g ..
~ maintaining axial ali~nment of the insert 1 w~th the hole 19.
`~ ~his is maintained as the insert 1 is driven fully into the hole 19 where the lip 20 also provides positive location at 20. the bottom or lnner end o~ the hole. As a result the ~;~
~, ~ tendency of the insert to pivot or rock out of axial alignment, ....................................................................... .
~:r: ~ : ~uring installatlon is avoided or very greatly minimiséd~
~ In the case of ultrasonic ins-tallation or by means of a :s~, thermal gun, mol-ten parent material is able to flow over ~ -25. the lip 20 and about the taper portions 6 in obtaining secure installation of the insert in the hole. Owing to ~,J~
5- : ~
~ ., : ., i`' -. ....................................................................... .
~S9~06 -:
-the buttre~s or barb like formation of the taper portions 6 and projections 60, the insert 1 has a high resistance to axial pull-out load when ins-talled in parent ~aterial, whils-t the serration 7 of the 5. taper portion 6 also resists -the tendency of the inser-t to rotate relative -to the parent material when the insert is under torsional load.
.':
~he insert is also shown provided with a rear taper g portion 26 of plain annular form tapering down in the 10. same direction as the taper por-tions 6 i.e. towards the leading end of -the insert 1. -~
'~: ' This plain taper portion 26 is of substantiall~ the same diameter as the taper portion 6 but the taper angle may be of the order of 45 as against 22 of the taper ;1 15. portion 6. However these and any other values quoted ~ herein are given by way of example only and ma~ be varied .';
, according to practical reguirements.
...~
`- The plain taper portion 26 provides an effective stop against the surface of the parent material about the 20. mouth of the hole 19 for providing a suitable finish for ;.~i ~.
aesthetic purposes and also fully closes the hole especially as regards grooves formed in the wall of the ~ ;f latter by the broaching action of the serrated taper ~` portions 6.
- :~
, . , :. .; - . , ~0 ~ 6 Again in -the case of ul-trasonic or -thermal gun installation, the plain taper portion 26 effectively prevents or minimises back spew of mol-ten plastics -~
material from the hole 19 as the installation of the ~` 5. insert 1 is completed.
... .
~ .
' ~
A further practical advantage arises from the fact that the rear face 260 of the plain taper portion 26 provides .
~ a relatively large bearing surface for the horn of ultra~
.. :.:: .
~; sonic installation apparatus or of a thermal installation ~;' 10. gun.
., ~he foregoing features and advantages of the insert are achieved with little or no incr~3ase in the cost of manufacture or production time per insert.
, ,~ .
..... .
~; ~IGUR~ 5 shows an insert body 1 having substantially ~5. the same exterior form as that described including the ;~
provision~of a lip or barb 20 on the reduced pilot ~-portion 12. However instead of a threaded bore, the body 1 is pro~idad with a co-axial threaded shank or .. ,,, ~.
~ stud 22 of reduced diameter extending from its rear end.
,.,, :,: ~
20. ~he formation of the bore 2 or shank 22 of the insert 1 depends on its intended purpose and for example may be of plain form.
,: ....
,,v , ,.. ; :
~ -7~
, ~..... : , . : , ~
.. . . . .
Claims (2)
1. An insert of the character described comprising an exterior part thereof having a series of annular peripheral taper portions each of the same diameter and each of which tapers down from a rear shoulder thereof in a direction towards the leading end of the insert, so that said taper portions are in barb-like formation, each said taper portion being longit-udinally serrated with serrations of V-form at its rear part to provide a plurality of projections for retention of the insert in a hole therefor in parent material, the serrations running out with forward reduction of each taper portion; a reduced diameter cylindrical pilot portion at the leading end of the insert; an external annular lip about the pilot portion closely adjacent the leading end of said pilot portion and axially spaced along the pilot portion from the adjacent taper portion, which lip is of taper form tapering down towards the leading end of said pilot portion and is of substantially smaller diameter than that of the said series of serrated annular peripheral taper portions for wall engagement in a said hole in order to assist in maintaining initial axial alignment and contact of the insert with the hole at the commencement of and during installation of the insert therein; and a rear plain external annular peripheral taper portion behind the rearmost serrated taper portion and of substantially the same diameter thereof and also tapering down in a direction towards the leading end of the insert in order to close a said hole and retain parent material therein on complete install-ation of the insert.
2. An insert according to claim 1 wherein the said external annular lip is longitudinally serrated by a continuation of the longitudinal serration of said series of serrated annular peripheral taper portions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA275,629A CA1059806A (en) | 1977-04-05 | 1977-04-05 | Insert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA275,629A CA1059806A (en) | 1977-04-05 | 1977-04-05 | Insert |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059806A true CA1059806A (en) | 1979-08-07 |
Family
ID=4108336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA275,629A Expired CA1059806A (en) | 1977-04-05 | 1977-04-05 | Insert |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1059806A (en) |
-
1977
- 1977-04-05 CA CA275,629A patent/CA1059806A/en not_active Expired
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