GB2160943A - Expansion rivet assembly - Google Patents
Expansion rivet assembly Download PDFInfo
- Publication number
- GB2160943A GB2160943A GB08416150A GB8416150A GB2160943A GB 2160943 A GB2160943 A GB 2160943A GB 08416150 A GB08416150 A GB 08416150A GB 8416150 A GB8416150 A GB 8416150A GB 2160943 A GB2160943 A GB 2160943A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rivet
- pin
- bore
- shank
- expansion
- 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
- 238000007373 indentation Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000004033 plastic Substances 0.000 abstract description 16
- 229920003023 plastic Polymers 0.000 abstract description 16
- 238000003780 insertion Methods 0.000 abstract description 12
- 230000037431 insertion Effects 0.000 abstract description 12
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
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
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
- F16B19/08—Hollow rivets; Multi-part rivets
- F16B19/10—Hollow rivets; Multi-part rivets fastened by expanding mechanically
- F16B19/1027—Multi-part rivets
- F16B19/1036—Blind rivets
- F16B19/1045—Blind rivets fastened by a pull - mandrel or the like
- F16B19/1054—Blind rivets fastened by a pull - mandrel or the like the pull-mandrel or the like being frangible
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Insertion Pins And Rivets (AREA)
Abstract
The shank (40) of drive pin (22) has a groove (52) near its head end which engages a reduced diameter bore portion (21) in the rivet (20) to temporarily hold them together prior to use. The drive pin (22) is inserted in the rivet bore (28) and drawn axially into the rivet bore (28) by a tool which causes the pin head (42) to engage the insertion end (39) of the rivet shank (24) and effect outward expansion of the rivet shank wall and which also causes break-off of the superfluous projection end (48) of the pin shank at a break-away indentation (46) formed in the pin shank. The pin shank (40) has serrations (50) which engage another reduced bore portion (32) in the rivet upon full pin insertion to hold the pin and rivet together permanently. This reduced bore portion (32) is serrated to enhance engagement with the serrations (50) of the pin (22). Both rivet body (20) and drive pin (22) are of plastics. <IMAGE>
Description
SPECIFICATION
Expansion rivet assembly
This invention relates to a fastener assembly commonly known as an ''expansion rivet" or a "blind rivet" and comprising a hollow plastic expandable rivet and a plastic pin axially movable in the rivet to cause rivet expansion.
Fasteners of the aforesaid general character are known and in use and US-A-4222304 illustrates the state of the art. That patent specification discloses a blind rivet which is injection molded from plastics material. It comprises a female member moulded about a male member. The female member comprises a flexible tubular wall and a flange about one end thereof, the wall defining a shoulder and having a stepped portion in the axial bore thereof at the one end and a plurality of elongate perforations about the wall. The male member comprises a shank located in the axial bore of the female member and axially movable in relation to the tubular wall, an enlarged head at one end in intimate contact and engagement with the other end of the female member, and a head portion at the other end and protruding from the one end of the female member.The head portion is shaped to be gripped by a tool for pulling the shank axially through the bore and the shank has a series of peripheral claws each forming a shoulder facing the other end of the female member so that, upon pulling, the perforated flexible tubular wall collapses and expands radially and successive claws snap their respective shoulders into engagement with the shoulder of the stepped portion, the engagement of the shoulders maintaining the tubular wall of the female member radially expanded and locking the male member against axial movement towards the other end of the female member.
In the above-described prior art fastener the male and female members are moulded together, one about the other, during manufacture in a so-called "two shot" moulding process and are not separable, even though separability of the fastener components is sometimes desirable during fastener installation if clearance is a problem. Furthermore, since interengaging serrations are necessarily formed on the male and female members during manufacture, considerable force is required initially to effect axial movement of the pin in the rivet before expansion of the rivet walls occurs. In addition, the prior art pin is so constructed that the portion thereof which protrudes from the rivet after fastener installtion must be cut off in a discrete step by means of a cutting tool.In particular, since the prior art rivet and pin are moulded together by the "two-shot" moulding process, it is not practical to mould a break-away indentation or groove in the pin because this groove would fill with plastic material from formation of the rivet therearound.
In accordance with the present invention there is provided an improved expansion rivet assembly which is constructed so as to overcome the aforementioned problems associated with some prior art "expansion rivets" or "blind rivets" and to provide other advantages.
An expansion rivet assembly in accordance with the invention comprises two separately moulded plastic components, namely: an expandable hollow plastic rivet or female member and a plastic drive pin or male member.
The rivet has a head or flange at one end and has a slotted shank insertable in aligned holes in workpieces to be joined. The rivet has a bore therethrough and the bore has portions of reduced diameter at opposite ends. The portion of reduced diameter near the head end of the rivet is provided with annular grooves. The drive pin has a head at one end and a shank which is extendable through the rivet bore. The drive pin shank has a first cylindrical portion and an adjoining second cylindrical portion of reduced diameter. A break-away indentation is located between the first and second portions. The first portion includes serrations and also a groove adjacent the pin head. The drive pin is adapted to be axially drawn into the bore in the rivet by a tool which causes the drive pin head to engage the insertion end of the rivet shank and effect outward expansion of the rivet shank wall.Such movement also finally causes break-off of the superfluous projecting end of the pin shank at the aforementioned breakaway indentation formed in the pin shank.
The reduced bore portion near the insertion end of the rivet engages the groove in the pin shank adjacent the pin head to temporarily hold the pin and rivet together prior to use.
The serrations in the first portion of the pin shank, which are initially disengaged from the large diameter bore position of the rivet, engage the grooved bore portion of reduced diameter at the head end of the rivet upon full insertion to hold the pin and rivet together permanently.
An expansion rivet assembly in accordance with the present invention offers several advantages over the prior art. For example, the groove in the pin shank adjacent the pin head engages the portion of reduced diameter at the insertion end of the rivet to temporarily secured the rivet and pin together prior to use to prevent loss or misplacement of one or the other of the components, yet the rivet and pin are easily separated if such is desired to facilitate fastener installation in cramped quarters or for other reasons. Also, since the pin comprises a smooth shank portion and serrations on the pin shank which do not initially engage any portion of the rivet bore, relatively smaller forces are required to initiate axial pin movement into and through the rivet bore, as compared to the prior art.However, when the serrations on the shank of the drive pin finally engage the annular grooved portion of reduced diameter in the rivet bore when the pin is pulled axially relative to the rivet, the two components become inseparably engaged.
Furthermore, since the pin is designed with a break-away indentation in the shank thereof, separation of the excess or protruding pin shank portion is a result of merely continuing to exert axial forces imposed by the installation tool after full rivet expansion is achieved and no separate cutting tool or break-off step is required.
A fastener assembly in accordance with the invention is economical to fabricate and use.
It remains permanently emplaced once installed and becomes even more firmly emplaced with the passage of time as the interengaging plastic surfaces flow together.
Two examples of assemblies according to the invention will now be described with reference to the accompanying drawings in which:
Figure 1 is a side elevation view of one side of a rivet for a first expansion rivet assembly;
Figure 2 is a view similar to Fig. 1 but showing another side of the rivet;
Figure 3 is a plan view of the head end of the rivet of Figs. 1 and 2;
Figure 4 is a side elevation view of a drive pin for an expansion rivet assembly;
Figure 5 is an end view of the insertion end of the pin of Fig. 4;
Figure 6 is a side elevation view, partly in section, of the expansion rivet assembly, showing it associated with workpieces to be joined but prior to expansion of the rivet.
Figure 7 is a view similar to Fig. 6 but showing the assembly after expansion of the rivet and break-off of the pin;
Figure 8 is a bottom plan view of the assembly of Fig. 7;
Figure 9 is a side elevation view of one side of a second form of rivet for an expansion rivet assembly;
Figure 10 is a view similar to Fig. 9 but showing another side of the rivet;
Figure 11 is a plan view of the head end of the rivet of Figs. 9 and 10,
Figure 12 is a side elevation view, partly in section, of the second expansion rivet assembly, showing it associated with workpieces to be joined but prior to expansion of the rivet.
Figure 13 is a view similar to Fig 12 but showing the assembly after expansion of the rivet and break-off of the pin; and
Figure 14 is a bottom plan view of the assembly of Fig. 1 3.
Referring to Figs. 1 through 8. the numeral 10 designates a first expansion rivet assembly which is insertable through aligned holes 1 2, 14 in a pair of workpieces 16, 18, respectively (see Figs. 6, 7, 8) to secure the workpieces together firmly and permanently. Fig. 6 shows the expansion rivet assembly 10 disposed in the aligned workpiece holes 12, 14 but not yet expanded, whereas Fig. 7 shows the expansion rivet assembly 10 fully installed. The expansion rivet assembly 10 comprises two components, namely, a female member or expandable hollow plastic rivet 20 and an associated male member or plastic drive pin 22 which is insertable in the rivet and movable therein by a tool (not shown) axially relative to the rivet to effect expansion of the latter, as comparison of Figs. 6 and 7 shows.Rivet 20 and pin 22 are made of a relative hard plastic such as Nylon (Registered
Trade Mark) acetal plastics material or the like and are formed separately by injection moulding processes.
The rivet 20, which has a head end and an insertion end, comprises a tubular shank 24 and a head or flange 26 at or near the head end of the rivet, a cylindrical bore 28 extending entirely through the head and shank. The bore 28 includes a portion 30 and a reduced diameter bore portion 32 near the head end of the rivet 20, and is provided with annular grooves 32A therein which define projections 32B therebetween. The bore 28 also includes another portion 21 of reduced diameter at or near the pin insertion end of the rivet 20. The shank 24 also has a pair of elongate perforations 34 extending through the shank wall and defining a pair of flexible wall portions 36 which fold outwardly during expansion of the rivet 20, as Figs. 7 and 8 show. Each flexible wall portion 36 includes a shoulder 37 along which it bends.Furthermore, the corresponding widening of the shank wall at the portion 21 also strengthens the wall and prevents outward bending of the shank wall under axial pressure when the pin 22 is drawn thereagainst.
A drive pin 22, which has a head end and an insertion end, comprises a cylindrical pin shank 40 having a head or flange 42 near its head end, a first or intermediate portion 44, a break-away indentation 46 at one end of the intermediate portion to enable break-off of the superfluous projecting end of the pin shank by axial force and an adjoining smooth cylindrical tool-engageable protruding or second portion 48 near its insertion end. the intermediate portion 44 of the shank 40 includes a plurality of peripheral gripping members or serrations 50 which take the form of axially spaced apart annular sharp-edged projections.
The portion 44 of the pin shank 40 also includes at its head end an indented annular recess 52 complementary to the reduced diameter portion 21 in the bore 28 of the rivet 20 and serves to hold the rivet 20 and the pin 22 in temporary association. The portion 44 is thus frictionally and releasably engageable with the projection or reduced diameter bore portion 21 in rivet 20 to maintain rivet 20 and pin 22 in association with each other prior to use, as Fig. 6 shows. The diameter of the portion 44 (and its serrations 50) is smaller than the diameter of the bore portion 30 in the rivet 20 but is larger than the bore portion 32. The gripping members 50 are engageable with the projections 32B in the reduced diameter bore portion 32 after axial movement of the pin effects expansion of the rivet 20 to hold the pin and the rivet together permanently.The serrations 50 are the same diameter as the pin shank 40 but the shank portion 48 is of slightly smaller diameter so as to fit snugly in the narrower bore portion 32.
The bore portion 30 does not, however, engage the serrations 50. The break-away indentation 46 is located on the pin shank 40 in that portion which is above the gripping members or serrations 50.
The expansion rivet assembly 10 operates and is used as follows. Initially assume that the rivet 20 and the drive pin 22 are separated from each other, as is the case immediately after they are independently manufactured. For convenience and to prevent loss or misplacement of either component, the pin 22 is inserted, either manually or by machine assembly, into the bore 28 of the rivet 20 to the position shown in Fig. 6 wherein the portion 21 of the bore 28 frictionally engages the annular indentation 52 in the pin 22 and the pin head 42 bears against the insertion end surface 39 of the rivet 20.In this preassembled condition, the assembly 10 is then inserted into the aligned holes 12, 1 4 in the adjacent workpieces 1 6, 18, respectively, as
Fig. 6 shows, and wherein the underside of the rivet head 26 bears against a surface of workpiece 1 6. As Fig. 6 also shows, the toolengageable portion 48 of the pin shank 40 extends outwardly of the head end of the bore 28 and the expansion rivet assembly 10 is in readiness to be acted upon by a conventional tool (not shown) which is used in the fastener trades to effect rivet expansion. Such tool comprises two relatively movable components, one of which forces the rivet head 26 firmly against the workpiece 16, while the other simultaneously grips the portion 48 of the pin 22 and pulls it axially (and upwardly relative to Fig. 6) in the bore 28.Such pin movement causes the pin head 42 to move against the end 39 of rivet shank 24 thereby causing the flexible wall portions 36 to fold to the position shown in Figs. 7 and 8, whereby the workpieces 16, 1 8 are trapped between the rivet head 26 and the folded wall portions 36. As the pin 22 moves axially from the position shown in Fig. 6 to that shown in Fig. 7, the pin shank 40 moves outwardly of the rivet bore 28, the serrations 50 move into tight engagement with the wall of reduced diameter bore portion 32, and the break-away indentation 46 moves level with the top surface of the rivet head 26. In this condition, the pin 22 is no longer movable axially in either direction. Further axial pulling on the pin 22 by the tool results in pin portion 48 separating from pin portion 44 in the region of the break-away indentation 46, as Fig. 7 shows.
Since the rivet 20 and pin 22 are now held together under relatively high force, and since the plastic of which the rivet and pin are made is somewhat "flowable" over a period of time (one or two days) when under pressure, two things occur: first, the wall of the narrow bore portion 32 flows between the pin serrations 50 making component separation impossible without rivet assembly destruction; and, second, the portion 21 of the end 39 of the rivet shank 24 flows into the recess 52 beneath the pin head 42 of the pin 22 thereby resulting in additional tight engagement between the rivet and pin.
Referring to Figs. 9 through 14, the numeral 310 designates a second expansion rivet assembly which is insertable through aligned holes 12, 14 in a pair of workpieces 16, 18, respectively (see Figs. 12, 13, 14) to secure the workpieces together firmly and permanently. Fig. 12 shows assembly 310 in the holes 12, 1 4 but not yet expanded, whereas Figs. 1 3 and 14 show the assembly fully installed. The rivet assembly 310 comprises an expandable hollow plastic rivet 320 and an associated plastic drive pin 322 which is movable by a tool (not shown) axially relative to the rivet to effect expansion of the latter, as comparison of Figs. 1 2 and 1 3 shows.Rivet 320 and pin 322 are made of plastics such as Nylon (Registered Trade
Mark) or the like and are formed separately by injection moulding processes. The rivet 320 comprises a shank 24 having a head 26 near one end and a bore 28 extending through the head and shank.The bore 28 includes a wider portion 30 and a reduced diameter bore portion 32 near the end of the shank 24 nearest head 26, and is provided with annular grooves 32A therein which define projections 32B therebetween. The shank 24 also has three elongate perforations 34 extending through the shank wall and defining three flexible wall portions 36 which fold outwardly during expansion of the rivet 320, as Figs. 1 3 and 1 4 show. Each flexible wall portion 36 includes a shoulder 37 along which it bends.
The drive pin 322 is identical to the pin 22 hereinbefore described. The intermediate portion 44 of the shank 40 includes a plurality of peripheral gripping members or serrations 50 which take the form of axially spaced apart annular sharp-edged projections. The groove 52 in the pin 322 is releasably engageable with the reduced diameter bore portion 21 in the rivet 320 to maintain the rivet 320 and pin 322 in association with each other prior to use, as Fig. 1 2 shows. The gripping members 50 are engageable with the projections 32B in the reduced diameter bore portion 32 after axial movement of the pin effects expansion of the rivet 320 to hold the pin and the rivet together permanently. The serrations 50 are the same diameter as the pin shank 40 but the shank portion 48 is narrower and fits slidingly in the narrower bore portion 32.
Claims (9)
1. An expansion rivet assembly comprising a rivet having a head at one end, a bore therethrough, and wall perforations, the bore having a portion of reduced diameter near one end; and a drive pin insertable into and axially movable in the bore from an initial position to an installed position to effect expansion of the rivet, the drive pin having an intermediate portion, a break-away portion at one end of the intermediate portion, a break-away indentation between the intermediate portion and the break-away portion, and an external flange at the other end of the intermediate portion for engagement with the other end of the rivet, the rivet and pin having interengaging means thereon for releasably maintaining the pin in the initial position, and the intermediate portion of the pin having means thereon which are disengaged from the rivet when the pin is in the initial position and which engage permanently the reduced diameter portion of the bore when the pin is moved axially to the installed portion and the external flange on the pin effects expansion of the rivet, so as permanently to maintain the pin in the installed position and the rivet expanded.
2. An assembly according to claim 1, wherein the interengaging means comprise an indentation on the intermediate portion of the pin for receiving a projection in the bore in the rivet.
3. An assembly according to claim 2, wherein the indentation and the projection are annular.
4. An assembly according to claim 1, claim 2, or claim 3, wherein the means on the intermediate portion of the pin comprise serrations.
5. An assembly according to claim 4, wherein the reduced diameter portion of the bore in the rivet is provided with grooves.
6. An assembly according to any of claims 1 to 5, wherein the head of the rivet comprises an external flange.
7. An assembly according to any of claims 1 to 6, wherein the break-away portion has a smaller diameter than the intermediate portion.
8. An assembly according to claim 2, wherein the projection in the bore comprises an internal taper at the other end of the rivet.
9. An assembly substantially as described with reference to Figs. 1 to 8, or Figs. 9 to 14 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08416150A GB2160943B (en) | 1984-06-25 | 1984-06-25 | Expansion rivet assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08416150A GB2160943B (en) | 1984-06-25 | 1984-06-25 | Expansion rivet assembly |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8416150D0 GB8416150D0 (en) | 1984-08-01 |
| GB2160943A true GB2160943A (en) | 1986-01-02 |
| GB2160943B GB2160943B (en) | 1987-07-08 |
Family
ID=10562950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08416150A Expired GB2160943B (en) | 1984-06-25 | 1984-06-25 | Expansion rivet assembly |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2160943B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0588671A1 (en) * | 1992-09-18 | 1994-03-23 | Emhart Inc. | Plastic fastener |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB424241A (en) * | 1932-08-03 | 1935-02-04 | Louis Charles Huck | Improvements relating to riveting |
| GB1527805A (en) * | 1975-11-17 | 1978-10-11 | Olympic Fastening Syst Inc | Method and means for installing blind fasteners |
| GB1570716A (en) * | 1975-11-17 | 1980-07-09 | Olympic Fastening Systems | Blind spacer fastener |
| GB2054785A (en) * | 1979-07-23 | 1981-02-18 | Itw Espana Sa | Blind rivets |
| GB2120741A (en) * | 1982-05-21 | 1983-12-07 | Avdel Ltd | Blind rivets |
-
1984
- 1984-06-25 GB GB08416150A patent/GB2160943B/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB424241A (en) * | 1932-08-03 | 1935-02-04 | Louis Charles Huck | Improvements relating to riveting |
| GB1527805A (en) * | 1975-11-17 | 1978-10-11 | Olympic Fastening Syst Inc | Method and means for installing blind fasteners |
| GB1570716A (en) * | 1975-11-17 | 1980-07-09 | Olympic Fastening Systems | Blind spacer fastener |
| GB2054785A (en) * | 1979-07-23 | 1981-02-18 | Itw Espana Sa | Blind rivets |
| GB2120741A (en) * | 1982-05-21 | 1983-12-07 | Avdel Ltd | Blind rivets |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0588671A1 (en) * | 1992-09-18 | 1994-03-23 | Emhart Inc. | Plastic fastener |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8416150D0 (en) | 1984-08-01 |
| GB2160943B (en) | 1987-07-08 |
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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: 19970625 |