GB2099096A - Screwthreaded inserts - Google Patents
Screwthreaded inserts Download PDFInfo
- Publication number
- GB2099096A GB2099096A GB8112979A GB8112979A GB2099096A GB 2099096 A GB2099096 A GB 2099096A GB 8112979 A GB8112979 A GB 8112979A GB 8112979 A GB8112979 A GB 8112979A GB 2099096 A GB2099096 A GB 2099096A
- Authority
- GB
- United Kingdom
- Prior art keywords
- insert
- vane
- leading
- vanes
- slot
- 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.)
- Granted
Links
- 238000009434 installation Methods 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 9
- 238000005755 formation reaction Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 12
- 239000012815 thermoplastic material Substances 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims description 2
- 229920001169 thermoplastic Polymers 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
- F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
- F16B37/122—Threaded inserts, e.g. "rampa bolts"
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Automatic Assembly (AREA)
- Dowels (AREA)
Abstract
An internally threaded insert for installation in a preformed bore has a series of vanes 16, 17, 18 whose diameters increase from the leading to the trailing end of the insert, so that each vane embeds further into the bore wall than the previous one during installation. The individual vanes are shaped to facilitate installation and resist pull-out. The head 12 is formed with toothed formations to resist torque loading when installed in place. A diametral slot is provided in the leading end to facilitate automatic feeding, and is so dimensioned that the insert body does not collapse radially. <IMAGE>
Description
SPECIFICATION
Screwthreaded inserts
This invention relates to an insert for installation in a preformed bore in a workpiece in order to provide a screwthreaded anchorage pilot.
The invention is particularly concerned with an insert which is intended to be installed as an interference fit and is provided with the formations for resisting axial pull-out and torque loading.
The object of the present invention is to provide a screwthreaded insert of the type referred to which is economic to manufacture and which, especially when installed in thermoplastics workpieces, does not unduly stress the material of the workpiece.
According to the present invention we provide an insert for installation in a preformed bore in a workpiece so as to provide a screwthreaded anchorage point, said insert comprising a body having at its trailing end an enlarged head provided with formations for resisting torque and between the head and its leading end a plurality of periphery extending vanes spaced from one snother and from said head, each such vane comprising a leading flank which, in a radially outwards direction, is inclined away from the leading end of the insert and a trailing flank which extends substantially perpendicularly to the main axis of the insert or is inclined in the same sense as the leading flank, the diameters of the said vanes increasing in a direction away from the leading end of the insert.
This configuration is especially suitable for installation as an interference fit in plastics material as the leading flanks of the vanes facilitate pushing in of the insert while the trailing flanks afford considerable resistance to pull-out loads due to the tendency for the plastics material to restore to its original shape and thereby occupy the region immediately behind the trailing flank of each vane. Moreover the vane configuration allows the vane to deflect elastically to some extent at its extremity thereby facilitating
installation further -- and increase resistance to
pull-out (particularly in harder materials which
may not restore to their original shape).
When the insert is installed as an interference fit by a pressing-in operation, there will be a tendency for the successive vanes to shear away
part of the bore wall. Such shearing may therefore
render the subsequent vanes less effective in
resisting pull-out. To overcome this, as mentioned
above, the diameters of the successive vanes
increase progressively from the leading towards
the trailing end of the insert so that each
successive vane tends to embed further into the
wall of the workpiece bore.
Preferably the angle of inclination of the leading flank is between 450 and 600 relative to said
main axis. An angle of this order coupled with the
provision of spacings between the head and
adjacent vanes avoids undue stressing of the
workpiece and hence the risk of rejection through
the generation of fractures during the installation procedure.
To facilitate automatic feeding from a bowl feeder for example and correct orientation of the insert, it is conveniently formed with a diametral slot across its leading end, which slot is so dimensioned and arranged that the insert body in this region has no significant tendency to collapse radially (due to the presence of the slot) when inserted into thermoplastic materials in contrast with known forms of slotted inserts in which the slot is provided to allow such radial collapse to take place and thereby add insertion of the inserts into hard materials. Such inserts are not inserted as an interference fit but rely on their radial collapsibility to enable them to be inserted into a bore. Subsequent insertion of a threaded fastener into the insert then serves to expand the insert thereby causing peripheral formations thereon to embed into the material.
To promote further understanding of the present invention, one example will now be described with reference to the accompanying drawing, the sole of which is a side view of an insert in accordance with the invention.
As shown, the insert comprises a generally cylindrical tubular body 10 having an internal screwthread. At its trailing end the body 10 has a radially enlarged head 12 provided with axial teeth which resist torque loading when the insert is installed in the workpiece. At its leading end there is a pilot portion 14 which may be of the same diameter as the insert body which, in turn, is slightly less than the diameter of the bore in which it is to be installed. The pilot portion 14 serves to locate the insert in the mouth of the bore prior to pressing-in.
Around its periphery, the insert body is formed with one or more vanes 1 6, 1 7 and 18 whose outside diameters increase progressively so that the leading vane 1 6 is of the smallest diameter and the trailing vane 18 is of the largest diameter.
The diameter of the vane 18 immediately adjacent the head portion 12 may be the same as the head diameter or slightly smaller. Each vane has an inclined leading flank 20 and a trailing flank 21 which extends substantially perpendicularly to the insert axis.
A diametrical slot 22 extends across the leading end of the insert but, as mentioned previously this slot is intended to aid feeding and orientation of the insert and is so arranged and dimensioned that the insert does not have any significant tendency to collapse radially when installed as an intereference fit in thermoplastic materials.
1. An insert for installation in a preformed bore in a workpiece so as to provide a screwthreaded anchorage point, said insert comprising a body having at its trailing end an enlarged head provided with formations for resisting torque and between the head and its leading end a plurality of peripherally extending vanes spaced from one another and from said head, each such vane
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. An insert for installation in a preformed bore in a workpiece so as to provide a screwthreaded anchorage point, said insert comprising a body having at its trailing end an enlarged head provided with formations for resisting torque and between the head and its leading end a plurality of peripherally extending vanes spaced from one another and from said head, each such vane comprising a leading flank which, in a radially outwards direction, is inclined away from the leading end of the insert and a trailing flank which extends substantially perpendicularly to the main axis of the insert or is inclined in the same sense as the leading flank, the diameters of the said vanes increasing in a direction away from the leading end of the insert.
2. An insert as claimed in Claim 1 in which the angle of inclination of the leading flank is between 450 and 600 relative to said main axis.
3. An insert as claimed in Claim 1 or 2 which is formed with a diametrical slot across its leading
end, which slot is so dimensioned and arranged
that the insert body in this region has no
significant tendency to collapse radially (due to the presence of the slot) when inserted into thermoplastic materials.
4. An insert as claimed in any one of claims 1 to 3 in which the head is formed with axial teeth.
5. An insert as claimed in Claim 4 in which the outside diameter of said teeth is greater than the diameter of the vane immediately adjacent thereto.
6. An insert as claimed in Claim 3 including a pilot portion, said slot being formed in the pilot portion without interrupting the vane nearest the leading end of the insert.
7. An insert substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8112979A GB2099096B (en) | 1981-04-28 | 1981-04-28 | Screwthreaded inserts |
IT20850/82A IT1198365B (en) | 1981-04-28 | 1982-04-21 | SCREW THREADED INSERTS |
FR8207142A FR2504616B3 (en) | 1981-04-28 | 1982-04-26 | BUILT-IN TAPPING ELEMENT |
DE19823215547 DE3215547A1 (en) | 1981-04-28 | 1982-04-26 | INSERT |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8112979A GB2099096B (en) | 1981-04-28 | 1981-04-28 | Screwthreaded inserts |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2099096A true GB2099096A (en) | 1982-12-01 |
GB2099096B GB2099096B (en) | 1984-12-05 |
Family
ID=10521405
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8112979A Expired GB2099096B (en) | 1981-04-28 | 1981-04-28 | Screwthreaded inserts |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE3215547A1 (en) |
FR (1) | FR2504616B3 (en) |
GB (1) | GB2099096B (en) |
IT (1) | IT1198365B (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2203641A (en) * | 1987-03-13 | 1988-10-26 | Celmac Ltd | Door and handle assembly |
GB2210125A (en) * | 1987-09-22 | 1989-06-01 | Tappex Thread Insert Limited | Insert |
GB2240152A (en) * | 1990-01-17 | 1991-07-24 | Psm Int Plc | Inserts for thermoplastic materials |
GB2278903A (en) * | 1993-06-10 | 1994-12-14 | Stackmasters Limited | Fixing separate mouldings together repeatably. |
DE4410565A1 (en) * | 1994-03-26 | 1995-09-28 | Fischer Artur Werke Gmbh | Plug for moulded item |
DE10013091A1 (en) * | 2000-03-17 | 2001-09-20 | Boellhoff Gmbh | Metal insert for holding bolts in thermoplastic articles consists of frustroconical sections which taper towards its base and top section which is cylindrical, has smaller diameter than top of section below and has two axial ribs |
GB2397632A (en) * | 2003-01-22 | 2004-07-28 | John Newton & Co Ltd | Membrane securing means |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD824677S1 (en) * | 2015-12-18 | 2018-08-07 | Colgate-Palmolive Company | Electric toothbrush |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES354935A1 (en) * | 1968-04-18 | 1969-11-16 | Precision Screw & Mfg | Improvements in the filleted rivets. (Machine-translation by Google Translate, not legally binding) |
IL34249A0 (en) * | 1969-04-10 | 1970-06-17 | Penn Eng & Mfg Corp | Fastener |
-
1981
- 1981-04-28 GB GB8112979A patent/GB2099096B/en not_active Expired
-
1982
- 1982-04-21 IT IT20850/82A patent/IT1198365B/en active
- 1982-04-26 DE DE19823215547 patent/DE3215547A1/en active Granted
- 1982-04-26 FR FR8207142A patent/FR2504616B3/en not_active Expired
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2203641A (en) * | 1987-03-13 | 1988-10-26 | Celmac Ltd | Door and handle assembly |
US4884834A (en) * | 1987-03-13 | 1989-12-05 | Celmac Limited | Door and handle assembly |
US4972545A (en) * | 1987-03-13 | 1990-11-27 | Celmac Limited | Door and handle assembly |
GB2203641B (en) * | 1987-03-13 | 1991-03-27 | Celmac Ltd | Door and handle assembly |
GB2210125A (en) * | 1987-09-22 | 1989-06-01 | Tappex Thread Insert Limited | Insert |
GB2210125B (en) * | 1987-09-22 | 1991-07-31 | Tappex Thread Inserts Ltd | Inserts |
GB2240152A (en) * | 1990-01-17 | 1991-07-24 | Psm Int Plc | Inserts for thermoplastic materials |
GB2240152B (en) * | 1990-01-17 | 1993-08-18 | Psm Int Plc | A method of installation of inserts |
GB2278903A (en) * | 1993-06-10 | 1994-12-14 | Stackmasters Limited | Fixing separate mouldings together repeatably. |
DE4410565A1 (en) * | 1994-03-26 | 1995-09-28 | Fischer Artur Werke Gmbh | Plug for moulded item |
DE10013091A1 (en) * | 2000-03-17 | 2001-09-20 | Boellhoff Gmbh | Metal insert for holding bolts in thermoplastic articles consists of frustroconical sections which taper towards its base and top section which is cylindrical, has smaller diameter than top of section below and has two axial ribs |
GB2397632A (en) * | 2003-01-22 | 2004-07-28 | John Newton & Co Ltd | Membrane securing means |
Also Published As
Publication number | Publication date |
---|---|
GB2099096B (en) | 1984-12-05 |
DE3215547C2 (en) | 1992-04-09 |
IT8220850A0 (en) | 1982-04-21 |
IT8220850A1 (en) | 1983-10-21 |
FR2504616B3 (en) | 1986-05-23 |
IT1198365B (en) | 1988-12-21 |
DE3215547A1 (en) | 1983-01-13 |
FR2504616A1 (en) | 1982-10-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930428 |