GB2175973A - Articles including at least two members joined together - Google Patents
Articles including at least two members joined together Download PDFInfo
- Publication number
- GB2175973A GB2175973A GB08512686A GB8512686A GB2175973A GB 2175973 A GB2175973 A GB 2175973A GB 08512686 A GB08512686 A GB 08512686A GB 8512686 A GB8512686 A GB 8512686A GB 2175973 A GB2175973 A GB 2175973A
- Authority
- GB
- United Kingdom
- Prior art keywords
- article
- annular
- groove
- annular collar
- propeller blade
- 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.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000013536 elastomeric material Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 6
- 239000011151 fibre-reinforced plastic Substances 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004709 Chlorinated polyethylene Substances 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- VHOQXEIFYTTXJU-UHFFFAOYSA-N Isobutylene-isoprene copolymer Chemical compound CC(C)=C.CC(=C)C=C VHOQXEIFYTTXJU-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 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
- F16B3/00—Key-type connections; Keys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/02—Hub construction
- B64C11/04—Blade mountings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/16—Blades
- B64C11/20—Constructional features
- B64C11/26—Fabricated blades
-
- 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
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
An article has a first member (10) with a cylindrical end portion (15) in which there is at least one circumferentially extending groove (17) and a second member (18) to which an annular collar (20) is secured. The first and second members are secured together by an annular layer (19) of material, preferably elastomeric, pressed between the cylindrical end portion (15) and the annular collar (20) such that the material is forced into the groove (17). A typical article is a propeller blade attached to a base plate. <IMAGE>
Description
SPECIFICATION
Articles including at least two members secured together
The present invention relates to articles in which at least two members are secured together, and in particularto such articles in which at least one member is formed from a Fibre Reinforced Plastic (FRP) material.
There are many ways where by two members can be rigidly secured together. These include, for example, the use of nuts and bolts, riveting, clamping and welding. These inevitably result in the structural weakening ofthe members in question.This weakening arises from the presence of holes necessaryforthe passage of bolts and rivets, and from local stresses caused by clamping and welding.
This loss of structural strength is proving to be particularly disadvantageous when one of the members is formed from a Fibre Reinforced Plastic material. FRP material is of increasing engineering interest for applications in which hitherto metals have been used, as it has many of the strength qualities of metal whilst being fundamentally lighter.
According to the present invention an article has a first member and a second memberthe first member terminating in a cylindrical section having at least one generally circumferentially extending groove therein, the first and second members being secu red together by an annular layer of material pressed between the first member, the second member and an annular collar co-axial with the cylindrical section such that the material is forced into the or each groove, the collar being secured to the second member.
The material is preferably an elastomeric material and is preferably compressed. Suitable elastomeric materials include polyurethanes, silicone elastomers, natural rubber, polyisoprene, styrene butadiene, polyacrylics, isobutene isoprene (butyl rubber), chloroprene (neoprene), nitrile butadiene, chlorosulphonated polyethylene, chlorinated polyethylene, ethylene propylene, fluorocarbons, epichlorohydrin, fluorosilicones, copolyesters, styrene polymers and olefins.
Alternatively the material used can be thermosetting resin our a low melting point alloy.
In one embodiment of the invention a propeller blade, for use with an aircraft, has a cylindrical base having therein a plurality of circumferential grooves and is securedtoa metallic bottom plate,which is itself secured to an annular aluminium collar by means of screws or bolts, by means of an annular layer of elastomeric material compressed into the space between the cylindrical section and the annular collarto such an extentthat it is fillingly forced into the grooves.
One embodimentofthe invention will now be described, by way of example only, with reference to the single Figure ofthe accompanying diagrammatic drawing which is an elevation, partly in section, of a propeller assembly for use in a variable pitch propeller installation in an aircraft.
An aircraft propeller blade illustrated generally at
10 has an inner matrix 11 formed from FRP material having short fibres, and an outer sheath 12 of FRP material in which the fibres extend continuously lengthwise ofthe propeller blade 10. At an inboard end 13 of the propeller blade 10the bladeisformed into a generallycircularshape and has waist14 leading to a cylindrical end section 15. The cylindrical end section 15 has a cylindrical hole 16 6therein and has a number of grooves such as those illustrated at 17 extending cylindrically around its outer periphery.
The propeller blade 10 is secured to a bottom plate 18 by means of an annular layer 19 of elastomeric material compressed between the cylindrical end section 15, an annular collar 20 and an anti-extrusion ring 21 which lies in a circumferential chamfer 22 in the bottom plate 18. The annular collar 20 is secured to bottom plate 18 by, for example, screws or bolts (not shown), and has an inner surface 23 having a diameter greaterthanthat of the diameter of the cylindrical end section 15 of the propeller blade 10 and an annular rim 24 leading to a shoulder 25. The shoulder 25 of the annular collar 20 bears against the waist 14 of the propeller blade 10 and the elastomeric material ofthe annular layer 19 is compressed into the grooves 17. Relative movement of the propeller blade 10 and bottom plate 18 is thereby prevented.
The members are assembled by positioning the propeller blade 10 and annular collar 20 in a jig with the shoulder25 of the annular collar 20 bearing againstthewaistl4ofthe propeller blade 10. The annular layer 19 of elastomeric material is introduced to the space between the inner surface 23 of the annular collar 20 and the outersurface of the cylindrical end section 15 of the propeller block 10.
The axial length of the annular layer 19 of elastomeric material is such that it extends slightly beyond the end ofthe cylindrical end section 15 by a distance dependent on the nature of the elastomeric material.
The bottom plate 18 and associated anti-extrusion ring 21 are positioned adjacent to the propeller block 10 and annular collar 20 such thatthe anti-extrusion ring 21 bears against the end of the annular layer 19.
The bottom plate 18 is then moved towards the propeller blade 10 and annular collar 20 bytightening screws and bolts (not shown). The elastomeric material of the annular layer 19 is thereby compressed and deformed into the grooves 17.
As illustrated a split ball race 30 is mounted on the external circumference of the annular collar 20to enable the assembly to be mounted in the hub of an aircraft engine drive shaft in such a way that the pitch angle ofthe propeller blade 10 can be varied. The bearing 20 bears against an annularflange 31 on the annularcollar20which can also be usedforthe screws or bolts by which the bottom plate 18 is secured to the annular collar 20. Adjacent the shoulder 25 ofthe annular collar 20 is an annular flange 32 to which can be fitted balance weights as indicated at 33.
In an alternative form ofthe invention the annular rim24oftheannularcollar20isomitted,theinner surface 23 being extended as illustrated by the dotted line 40 to the shou Ider 25. Circumferential grooves such as those illustrated in dotted lines at 41, and similartogrooves 17,areformedintheinnersurface 23 ofthe annularcollar20.
Whilstthe invention has been described above with reference to the accompanying drawing with regard to a propeller blade assembly it will be realised that the invention is equally applicableto other articles having two members which are to bejoined together and in which one member has, or can conveniently be adapted to have, a cylindrical end section.
The circumferential grooves 17 may be replaced by one or more helical grooves.
Also, whilst the invention as above-described provides an article which can be completely disassembled it may sometimes only be required that an article have a base plate 18 removable, or indeed it may be the intention that an article once assembled should never be disassembled. In such cases the material usedfortheannularlayer19can bea thermosetting resin ora low melting point alloy.
It will be realised thatthe invention also embodies a method of joy ofjoining two members including the steps of providing one memberwith a cylindrical end section with at least one circumferential groove therein, inserting an annular layer of material betweenthefirstmemberandanannularcollar co-axial with the cylindrical section,forcing the second member into contact with the annular collar such thatthe material isforced into the or each groove, and securing the collarto the second member.
Claims (11)
1. An article having a first member and a second member,thefirst member terminating in a cylindrical portion having at least one generally circumferentially extending groove therein, the first and second members being secured together by an annular layer of material pressed between the first member, the second memberand an annular collar co-axialwith the cylindrical portion such thatthe material is forced into the or each groove, the collar being secured to the second member.
2. An article as claimed in Claim 1 wherein the material is an elastomeric material.
3. An article as claimed in Claim 2 wherein the elastomeric material is compressed.
4. An article as claimed in Claim 1 wherein the material is a thermosetting resin.
5. An article as claimed in Claim 1 wherein the material is a low melting pointalloy.
6. An article as claimed in any one of Claims 1 to 5 wherein the preach grooveiscircumferential.
7. An article as claimed in any one of Claims 1 to 5 wherein the or each groove is helical.
8. An article as claimed in any one of Claims 1 to 7 wherein the first member is a propeller blade and the second member is a base plate.
9. An articlesubstantially as herein described.
10. A propeller blade and base plate assembly substantially as herein described with reference to the accompanying drawing.
11. A method ofjoining two members including the steps of providing one memberwith a cylindrical end section with at leastonecircumferential groove therein, inserting an annular layerofmaterial betweenthefirst member and an annular collar co-axial with the cylindrical section,forcing the second member into contactwith the annular collar such thatthe material is forced into the or each groove, and securing the collarto the second member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08512686A GB2175973A (en) | 1985-05-20 | 1985-05-20 | Articles including at least two members joined together |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08512686A GB2175973A (en) | 1985-05-20 | 1985-05-20 | Articles including at least two members joined together |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8512686D0 GB8512686D0 (en) | 1985-06-26 |
| GB2175973A true GB2175973A (en) | 1986-12-10 |
Family
ID=10579389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08512686A Withdrawn GB2175973A (en) | 1985-05-20 | 1985-05-20 | Articles including at least two members joined together |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2175973A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016528089A (en) * | 2013-06-25 | 2016-09-15 | ザ・ボーイング・カンパニーＴｈｅ Ｂｏｅｉｎｇ Ｃｏｍｐａｎｙ | Joint assembly and method of forming a joint assembly |
| EP3552953A1 (en) * | 2018-04-10 | 2019-10-16 | Ratier-Figeac SAS | Propeller blade root coupling |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106697262A (en) * | 2016-12-12 | 2017-05-24 | 惠阳航空螺旋桨有限责任公司 | Composite propeller shank connecting structure for propeller |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB500679A (en) * | 1937-03-10 | 1939-02-14 | Ettore Bugatti | Improvements in and relating to screw propellers |
| GB726242A (en) * | 1952-03-25 | 1955-03-16 | Deutsche Edelstahlwerke Ag | Improvements in or relating to grinding discs for pin mills |
| GB787278A (en) * | 1955-06-07 | 1957-12-04 | Accles & Pollock Ltd | Vehicle seat posts |
| GB1202208A (en) * | 1966-11-11 | 1970-08-12 | Spembly Technical Products Ltd | Improvements relating to methods of making joints for pipes and the like |
| GB1369236A (en) * | 1972-05-23 | 1974-10-02 | British Iron Steel Research | Space frames |
| GB1457937A (en) * | 1973-09-27 | 1976-12-08 | Powondra F | Joint between two members |
| GB1581480A (en) * | 1976-05-18 | 1980-12-17 | Raufoss Ammunisjonsfabrikker | Ladder construction |
| GB2101257A (en) * | 1981-06-19 | 1983-01-12 | Barry Wootton Staynes | Joining tubular members |
-
1985
- 1985-05-20 GB GB08512686A patent/GB2175973A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB500679A (en) * | 1937-03-10 | 1939-02-14 | Ettore Bugatti | Improvements in and relating to screw propellers |
| GB726242A (en) * | 1952-03-25 | 1955-03-16 | Deutsche Edelstahlwerke Ag | Improvements in or relating to grinding discs for pin mills |
| GB787278A (en) * | 1955-06-07 | 1957-12-04 | Accles & Pollock Ltd | Vehicle seat posts |
| GB1202208A (en) * | 1966-11-11 | 1970-08-12 | Spembly Technical Products Ltd | Improvements relating to methods of making joints for pipes and the like |
| GB1369236A (en) * | 1972-05-23 | 1974-10-02 | British Iron Steel Research | Space frames |
| GB1457937A (en) * | 1973-09-27 | 1976-12-08 | Powondra F | Joint between two members |
| GB1581480A (en) * | 1976-05-18 | 1980-12-17 | Raufoss Ammunisjonsfabrikker | Ladder construction |
| GB2101257A (en) * | 1981-06-19 | 1983-01-12 | Barry Wootton Staynes | Joining tubular members |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016528089A (en) * | 2013-06-25 | 2016-09-15 | ザ・ボーイング・カンパニーＴｈｅ Ｂｏｅｉｎｇ Ｃｏｍｐａｎｙ | Joint assembly and method of forming a joint assembly |
| US10167075B2 (en) | 2013-06-25 | 2019-01-01 | The Boeing Company | Joint assembly and method of forming thereof |
| EP3552953A1 (en) * | 2018-04-10 | 2019-10-16 | Ratier-Figeac SAS | Propeller blade root coupling |
| US10968757B2 (en) | 2018-04-10 | 2021-04-06 | Ratier-Figeac Sas | Propeller blade root coupling |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8512686D0 (en) | 1985-06-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |