GB2120795A - Load-indicating washer - Google Patents
Load-indicating washer Download PDFInfo
- Publication number
- GB2120795A GB2120795A GB08213138A GB8213138A GB2120795A GB 2120795 A GB2120795 A GB 2120795A GB 08213138 A GB08213138 A GB 08213138A GB 8213138 A GB8213138 A GB 8213138A GB 2120795 A GB2120795 A GB 2120795A
- Authority
- GB
- United Kingdom
- Prior art keywords
- washer
- relatively
- ofthe
- rigid
- load
- 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- Withdrawn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
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 239000004677 Nylon Substances 0.000 claims abstract description 5
- 229920001778 nylon Polymers 0.000 claims abstract description 5
- 229920001084 poly(chloroprene) Polymers 0.000 claims abstract description 5
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 230000000007 visual effect Effects 0.000 claims description 5
- 230000000750 progressive effect Effects 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 230000013011 mating Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
- G01L5/243—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed using washers
-
- 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
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
- F16B31/028—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load with a load-indicating washer or washer assembly
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
A composite load-indicating on washer (1, 2) is provided for visually indicating when a nut and bolt combination (3, 10) has been tightened to a predetermined degree. In its simplest form, the composite washer comprises a relatively rigid annular element (1), such as a steel washer, arranged in coaxial face-to-face relation with a relatively deformable element (2), for example, of soft nylon or neoprene. In use, the composite washer (1, 2) is located on the shank of a bolt (3) between the workpiece (4) concerned and either the bolt head or a mating nut (10). As the nut and bolt combination (3, 10) is tightened, the deformable element (2) expands radially until at a preset tightness, its diameter exceeds that of the rigid element (1) acting as a reference; the deformable element (2) is now visible around the edge of the rigid element (1) indicating that the required tightness has been achieved. <IMAGE>
Description
SPECIFICATION
Load-indicating washer
The present invention relates to a load-indicating washerforvisually indicating when a nut and bolt combination has been tightened to a predetermined degree.
It is well appreciatedthatthe under or overtightening of nut and bolt combinations can prove prejudicial to the safety of the apparatus or structure in which they are incorporated. As a result, various techniques have been employed in the past to provide a check on the tightening of nut and boltcombinations; however, none ofthesetechniques has proved wholly satisfactory in practice, either due to their cost or inconvenience in use. With respect to this latter factor, experience has shown that any checking technique requiring otherthan minimal involvement of a labour force will generally fail to be consistently used exceptwhen the labourforce is constantly encouraged to do so.A further disadvantage of certain prior art checking techniques is that they provide only a transient indication that a nut and bolt combination has been tightened to a predetermined degree.
One recent proposal for providing a visual check on the tightening of a nut and bolt combination involves the use of a standard rubber O-ring seated in an annular groove machined in the workpiece-facing surface of the head of a bolt. In additionto this groove, the head of the bolt is also formed with a small hole extending through the head from the groove in a direction parallel to the bolt's axis to open out into the outer end surface of the bolt's head. In use, a steel washer is interposed between the head ofthe boltand the workpieceto trap the O-ring in its groove.As the bolt is tightened, the O-ring is placed under load and flows into the only free space available,that is,the hole formed in the head.The appearance of a small pip of rubber on the outer end surface ofthe bolt's head indicates that the bolt has been tightenedtothe desired degree.
Whilethis prior art arrangement provides a semi permanentvisual indication of the bolt's tightness and is convenient to use, it does suffer from several disadvatanges such as the need to accurately machine a groove and through-hole into the head of the bolt.
Furthermore, the accu racy of the technique depends on the quality of seal provided bythewasher.
It is an object of the present invention to provide a way of checking the tightening of nut and bolt combinations which is not only quick and easyto implement and gives a permanent or semi-permanent record ofthe degree oftightening, but is also cheap and simple and does not require accurate machining of the nut and bolt combination.
According to one aspect ofthe present invention, there is provided a composite load-indicating washer forvisually indicating when a nut and bolt combination has been tightened to a predetermined degree, said washer comprising a relatively rigid, annular element arranged in coaxial, face to face, relation with a relatively deformable annular element of smaller diameter, the deformable element being arranged to expand radially outwards across the juxtaposed annularface of the rigid element upon compression of the washer, and the rigid element serving to provide a
reference relative to which the radial expansion ofthe deformable element, and thus the compression of the washer, can be visually judged.
Preferably, the rigid annular element is a steel washerandthe deformable element is made of a material such as soft nylon or neoprene rubber. In use ofthe load-indicating washer, the washer is interposed between the workpiece concerned and either the nut orthe head of a bolt of a nut and bolt combination to be tightened, the rigid annular element being away from the workpiece As the nut and boltcombination is tightened, the deformable elementofthewasherexpands radially until ata given tightness, corresponding to said predetermined degree, its diameter exceeds that ofthe rigid washer element serving as a reference; the deformable element is now visible around the edge of the rigid element when the nut and bolt combination is viewed end on, indicating that the combination has been tightened to the desired degree.
Advantageously, the deformable element is made brightly coloured to facilitate rapid visual inspection of a number of bolts.
The two elements of the load-indicating washer may be bonded together or may be separately engaged with the shank of a bolt.
By using rigid annular elements of different diameters, different degrees oftightening can be judged.
Furthermore, a graded referencecanbeprovided,for example by forming a radial recess in the periphery of the rigid element so that the progress of the expansion ofthe deformable element is made visible, the recess being graduated either by steps in its sides or by adjacent markings; alternatively, in certain applications, a transparent rigid element could be used to permit visual monitoring of the progressive expansion of the deformable element.
It is, in fact, possible to divide the load-indicating washers ofthe invention into two differenttypes. In one type, the forces transmitted through the washer from the nut or bolt head to the workpiece concerned, passfirstthrough the relatively rigid washer element and then through the relatively-deformable washer element, so that this latter element is subjected to the full loading ofthe nut and bolt combination and is deformed accordingly. In the second type of washer, the relatively rigid element is formed with axiallyextending portions which serve to provide a path, in parallel with that provided by the relatively-deformable element, for the forces passing between the rigid element and the workpiece.The form and material composition of the relatively-rigid element is such that not only will the majority of the forces transmitted by the washer pass through the said axially extending portions ratherthan through the relatively - deformable element, but the relatively - rigid element will also by subjectto significant axial compression by an
The drawing(s) originally filed were informal and the print here reproduced is
taken from a later filed formal copy.
amount dependent on the loading ofthewasher, so that the relatively-deformable element will be effec
tively axially deformed in proportion to the loading of the washer.This second type of washer isadvan- tageous in applications where there is a risk of deterioration with time ofthe relatively-deformable element, since the tightness of the nut and bolt combination will be virtually unaffected bythedis- appearance of this latter element,the stress path through the washer being provided by the relativelyrigid element.
The load-indicating washer can incorporate a second rigid annular element (again, for example a steel washer) provided on the opposite side of the deformable elementto the first-mentioned rigid annular element, the deformable element being then sandwiched between the two rigid elements. Such an arrangement ensuresthatthe radial expansion of the deformable element is independent of the surface roughness of the workpiece.
Various other novel aspects and features of the invention wi II become will becomeapparentfromthefollowing description, given byway of example, of several forms of load-indicating washer, reference being made to the accompanying diagrammatic drawings, in which:
Figure 1 is a plan view of a firstform of washer embodying the invention;
Figure 2 is a cross-section through the Figure 1 washer;
Figure 3 is a side view ofthe Figure 1 washer in use in conjuction with a nut and bolt combination;
Figure 4 is a cross-section similarto Figure 2, through a firstvariant ofthe Figure 1 washer;
Figure 5 is a plan view of a second variant of the
Figure 1 washer;
Figures 6 and 7 are sections similarto Figure 2 respectively showing second and third forms of washer embodying the invention;
Figure 8 is a plan view of a fourth form ofwasher embodying the invention;;
Figure 9 is a section on lineVIII-VIII of Figure 8, and Figure loins a side elevation of a fifth form of washer embodyingthe invention.
As shown in Figures 1 and 2, the firstform of load-indicating washer com prisies a relatively-rigid annular element in the form of a flat steel washer element 1, and a relatively - deformable annular element 2 formed of soft nylon or neoprene rubber.
The deformable element 2 is of substantially smaller diameterthan the steel washer element 1 and is bonded two oneface ofthe latter by any suitable means.
The element 2 is brightly coloured.
In use, the load-indicating washer is interposed
between a workpiece 4 (see Figure3) and eitherthe head of a bolt30ra nut10 of a nut and bolt
combination being used in conjuction with the
workpiece; in Figure 3, the washer is shown inter
posed between the workpiece 4 and the head of the
bolt3, the steel washer element 1 being towards the
bolt's head. Asthe bolt3 istightened,the load
indicating washer is compressed with the result that
the relatively - deformable element 2is squeezed
radially outwards. At some point, the diameter of the
element 2 will exceed that of the element 1so that the
brightly coloured element 2 becomes visible when
the bolt is viewed in the direction indicated by arrow
A in Figure 3.The dimensioning ofthe elements 1 and
2 is chosen such that the element 2 becomes visible
around the periphery ofthe element 1 when the
required degree of tightness ofthe bolt3 has been
achieved.
Itwill be appreciated that intheform ofwasher
illustrated in Figures 1 to 3, the relatively- deformable
element 2 is subject to the full loading experienced by
the bolt 3 since there is no other path forthe
transmission of forces between the workpiece 4 and
the head of the bolt 3.
Figure 4shows a varient of the washer illustrated in
Figures I to 3, in which a second flat steel washer element 1 is provided, the deformable element 2
being disposed between the two steel washer ele
ments 1, 1 7. Such an arrangement ensures that the
radial expansion ofthe deformable element 2 upon
compression of the washer, is independent ofthe
surface roughness ofthe workpiece concerned.
Thevariantofthe Figure 1 washer shown in Figure S, isformed with a recess 5 provided with notched
graduations 6 in one radially- extending wall thereof.
The provision of the recess 5 enables a progressive visual checkto be made on the radial expansion of the relatively-deformable element during tightening of a nutand bolt combination. The graduations 6 serve to provide an indication of when different degrees of tighening ofthe nut and bolt combination have been
achieved.
Figures 6 and 7 show, in cross-section, two further forms of load-indicating washer operating on the same principle asthe Figure 1 washer. Various other shapes of washer are, course, possible.
The form of load-indicating washer shown in
Figures 8 and 9 differs from those shown in Figures 1 to 6 in that it is provided with axially extending portions 7 which are arranged to project around the relatively-deformable element 2to provide, in para llel with this latter element, a path forforces passing between the body of the relatively-rigid element 1 and a workpiece.Theform and material composition of the relatively-rigid element 1 is chosen such that not only will the majority offorces transmitted by the washer pass through the portions 7 ratherthan through the relatively-deformable element 2, but the relatively-rigid element 1 will also be subjectto significant axial compression as the associated nut and bolt combination is tightened. As a resu It, the relatively-deformable element 2 of the washer will be effectively axially compressed, and thus radially expanded, in proportion to the loading ofthe washer.
This arrangement is advantageous in applications wherethe element 2 may deteriorate with time since the disappearance ofthis element will notsubstan tiallyaffectthe bolttightness, the stress path through the washer being at all times provided almost exclusively by the relatively- rigid element 1.
The form of the axially-extending portions 7 may,
of course, be varied from that illustrated in Figures 8 and 9 Thus, in theform of load-indicating washer shown in Figure 10, the element I is of circular, wavy
form and the element 2 is of complementary shape,
the troughs in the latter element being filled bythe
portions 7 of the element 1. As can be seen in Figure 1 0, the main mass ofthe element 2 is divided into
sections 12 bounded by adjacent portions 7 ofthe
element 1; these sections 12 can be interconnected
into a single body either bythin webs extending
circumferentially beneath the portions 7 or by a radially-inner annular ring (not visible) arranged to lie
in a complementary seat formed in the element 1.
Anyofthewashers illustrated in Figures5to 10 can, of course, be provided with a secondflat rigid element 11 in the manner illustrated in Figure 4for the washerof Figures 1 to 3.
CLAIMS (Filed on 6 May, 83)
1. A composite load-indicating washerforvisual lyindicatingwhena nut and bolt combination has been tightened to a predetermined degree, said washer comprising a relatively-rigid, annularelement arranged in coaxial, face to face, relation with a relatively - deformable element of lesser radial extent,thedeformable element being arranged to expand radially outwards across the juxtaposed annularface of the rigid element upon compression ofthewasher, and the rigid elementservingto provide a reference relative to which the radial expansion ofthe deformable element, and thus the compression ofthe washer, can be visually judged.
2. Aload-indicating washer according to Claim 1, wherein the arrangement of the elements is such that, in use, forces passing through thewasherare transmitted seriallythrough said elements.
3. Aload-indicatingwasheraccordingtoClaim 1, wherein the arrangement of the elements is such that, in use, forces passing through the washer are transmitted in parallel through the elements, the relatively rigid element transmitting the majority of said forces and being axially deformed thereby by an amount indicated by the radial expansion of the relatively deformable element.
4. A load-indicating washer according to Claim 3 wherein the relatively rigid element has an undulating circumferential form, the relatively deformable element being disposed on one side ofthe relatively rigid element in the hollows resulting from the undulating form of the latter.
5. A load-indicating washer according to any one ofthe preceding claims, wherein the deformable element is made of soft nylon or neoprene rubber.
6. Aload-indicating washer according to anyone of the preceding claims, wherein the rigid element is provided with a radial recess in its periphery so that the progress ofthe expansion of the deformable element can be seen.
7. A load-indicating washer according to any one of Claims 1 to 4, wherein the rigid element is made of a transparent material to permit visual monitoring of the progressive expansion of the deformable element.
8. A load-indicating washer according to any one of the preceding claims including a second relatively rigid annular element provided on the opposite side ofthe relatively deformable element to the firstmentioned relatively rigid element.
9. A load-indicatingwasher according to any one ofthe preceding claims,wherein the elements of the washer are bonded together.
10 A composite load-indicating washer, substan tial ly as herein before described with reference to any one of Figures 1,4, 5,6,7,8and l0ofthe accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
1. A composite load-indicating washerforvisual lyindicatingwhena nut and bolt combination has been tightened to a predetermined degree, said washer comprising a relatively-rigid, annularelement arranged in coaxial, face to face, relation with a relatively - deformable element of lesser radial extent,thedeformable element being arranged to expand radially outwards across the juxtaposed annularface of the rigid element upon compression ofthewasher, and the rigid elementservingto provide a reference relative to which the radial expansion ofthe deformable element, and thus the compression ofthe washer, can be visually judged.
2. Aload-indicating washer according to Claim 1, wherein the arrangement of the elements is such that, in use, forces passing through thewasherare transmitted seriallythrough said elements.
3. Aload-indicatingwasheraccordingtoClaim 1, wherein the arrangement of the elements is such that, in use, forces passing through the washer are transmitted in parallel through the elements, the relatively rigid element transmitting the majority of said forces and being axially deformed thereby by an amount indicated by the radial expansion of the relatively deformable element.
4. A load-indicating washer according to Claim 3 wherein the relatively rigid element has an undulating circumferential form, the relatively deformable element being disposed on one side ofthe relatively rigid element in the hollows resulting from the undulating form of the latter.
5. A load-indicating washer according to any one ofthe preceding claims, wherein the deformable element is made of soft nylon or neoprene rubber.
6. Aload-indicating washer according to anyone of the preceding claims, wherein the rigid element is provided with a radial recess in its periphery so that the progress ofthe expansion of the deformable element can be seen.
7. A load-indicating washer according to any one of Claims 1 to 4, wherein the rigid element is made of a transparent material to permit visual monitoring of the progressive expansion of the deformable element.
8. A load-indicating washer according to any one of the preceding claims including a second relatively rigid annular element provided on the opposite side ofthe relatively deformable element to the firstmentioned relatively rigid element.
9. A load-indicatingwasher according to any one ofthe preceding claims,wherein the elements of the washer are bonded together.
10 A composite load-indicating washer, substan tial ly as herein before described with reference to any one of Figures 1,4, 5,6,7,8and l0ofthe accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08213138A GB2120795A (en) | 1982-05-06 | 1982-05-06 | Load-indicating washer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08213138A GB2120795A (en) | 1982-05-06 | 1982-05-06 | Load-indicating washer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2120795A true GB2120795A (en) | 1983-12-07 |
Family
ID=10530200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08213138A Withdrawn GB2120795A (en) | 1982-05-06 | 1982-05-06 | Load-indicating washer |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2120795A (en) |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2577632A1 (en) * | 1985-02-19 | 1986-08-22 | Framatome Sa | ELEMENT FILTERING THE VARIATIONS OF CONSTRAINTS IN A BOLT ASSEMBLY |
| EP0217653A2 (en) * | 1985-09-27 | 1987-04-08 | RAYCHEM CORPORATION (a Delaware corporation) | Compression pressure indicator |
| GB2195861A (en) * | 1986-09-20 | 1988-04-13 | Messerschmitt Boelkow Blohm | External view system for training equipment |
| FR2644529A1 (en) * | 1989-03-17 | 1990-09-21 | Kyodo Denki | DEVICE FOR INDICATING INCOMPLETE FASTENING AND COMPLETE FASTENING OF ELEMENTS TO BE SECURED |
| EP0395929A1 (en) * | 1989-04-29 | 1990-11-07 | BWM Dübel + Montagetechnik GmbH | Supporting bar for a carrying rail of a wall-or ceiling covering |
| US5954010A (en) * | 1996-09-19 | 1999-09-21 | Lucent Technologies Inc. | Temperature sensing device for permanently indicating when a product is exposed to critical temperatures |
| US6279242B1 (en) | 1999-09-13 | 2001-08-28 | Swagelok Company | Intrinsic gauging for tube fittings |
| US6561124B1 (en) * | 1998-11-13 | 2003-05-13 | Business Lines Limited | Position indicator assembly for nuts and or bolts |
| US6640457B2 (en) | 1999-09-13 | 2003-11-04 | Swagelok Company | Intrinsic gauging for tube fittings |
| FR2881194A1 (en) * | 2005-01-27 | 2006-07-28 | Lionel Utille | Nut`s tightening effect indicating device for assembling two units of e.g. mast, has colored deformable washer sandwiched between two non-deformable supporting washers, and comprising central hole with retaining projection extending inwards |
| US7194817B2 (en) | 1999-09-13 | 2007-03-27 | Swagelok Company | Intrinsic gauging for tube fittings |
| WO2007118941A1 (en) | 2006-04-19 | 2007-10-25 | Lionel Utille | Device for displaying the correct tightening force for a nut mounted on a threaded rod |
| WO2009060270A1 (en) * | 2007-11-06 | 2009-05-14 | Nordsinter S.R.L. | Visual indication device of the coupling condition between two mechanical members |
| GB2471563A (en) * | 2009-06-30 | 2011-01-05 | Saipem Spa | Device for the application of a predefined axial load |
| CN103180623A (en) * | 2010-10-29 | 2013-06-26 | 喜利得股份公司 | Load-indicating washer |
| WO2017093374A1 (en) * | 2015-12-04 | 2017-06-08 | Ejot Baubefestigungen Gmbh | Fixed or sliding screw |
| DE102018100495A1 (en) | 2017-01-17 | 2018-07-19 | Fischerwerke Gmbh & Co. Kg | Washer, mounting arrangement and use of the washer |
| DE102018100493A1 (en) | 2017-01-17 | 2018-07-19 | Fischerwerke Gmbh & Co. Kg | Washer, washer assembly and washer |
| DE102018100496A1 (en) | 2017-01-17 | 2018-07-19 | Fischerwerke Gmbh & Co. Kg | Mounting arrangement and washer |
| CN110654186A (en) * | 2019-10-15 | 2020-01-07 | 安徽拓扑思汽车零部件有限公司 | Gasket for automobile TPMS valve and valve installation structure |
| CN113567031A (en) * | 2020-12-01 | 2021-10-29 | 杭州雷恩智能制造有限公司 | Bolt pretightening force monitoring system |
| WO2023076800A1 (en) * | 2021-10-29 | 2023-05-04 | Anthony Decarmine | Fastener assembly and method of use |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB748969A (en) * | 1953-03-19 | 1956-05-16 | Wingfoot Corp | Washers for use in measuring the tension in mine-roof supporting bolts |
| GB797729A (en) * | 1955-08-02 | 1958-07-09 | Douglas Aircraft Co Inc | Improvements in or relating to pre-load indicating washer |
| GB900231A (en) * | 1957-10-04 | 1962-07-04 | Henry Anderson Spencer | Means for controlling axial loads on bolts or the like |
| GB1090300A (en) * | 1964-05-13 | 1967-11-08 | Atlas Bolt & Screw Co | Improvements in washers and assembled, headed fasteners and washers |
| GB1184033A (en) * | 1967-02-16 | 1970-03-11 | Daimler Benz Ag | Improvements relating to Washers for Screw Connections |
| GB1183683A (en) * | 1967-08-10 | 1970-03-11 | Torque Tension Bolt Company Pr | Anchor Bolt Assemblies. |
| GB1270529A (en) * | 1968-08-30 | 1972-04-12 | Dunlop Holdings Ltd | Load-indicating devices |
-
1982
- 1982-05-06 GB GB08213138A patent/GB2120795A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB748969A (en) * | 1953-03-19 | 1956-05-16 | Wingfoot Corp | Washers for use in measuring the tension in mine-roof supporting bolts |
| GB797729A (en) * | 1955-08-02 | 1958-07-09 | Douglas Aircraft Co Inc | Improvements in or relating to pre-load indicating washer |
| GB900231A (en) * | 1957-10-04 | 1962-07-04 | Henry Anderson Spencer | Means for controlling axial loads on bolts or the like |
| GB1090300A (en) * | 1964-05-13 | 1967-11-08 | Atlas Bolt & Screw Co | Improvements in washers and assembled, headed fasteners and washers |
| GB1184033A (en) * | 1967-02-16 | 1970-03-11 | Daimler Benz Ag | Improvements relating to Washers for Screw Connections |
| GB1183683A (en) * | 1967-08-10 | 1970-03-11 | Torque Tension Bolt Company Pr | Anchor Bolt Assemblies. |
| GB1270529A (en) * | 1968-08-30 | 1972-04-12 | Dunlop Holdings Ltd | Load-indicating devices |
Cited By (38)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2577632A1 (en) * | 1985-02-19 | 1986-08-22 | Framatome Sa | ELEMENT FILTERING THE VARIATIONS OF CONSTRAINTS IN A BOLT ASSEMBLY |
| EP0194907A1 (en) * | 1985-02-19 | 1986-09-17 | Framatome | Compensating element for variations in2tension in a bolted connection |
| EP0217653A2 (en) * | 1985-09-27 | 1987-04-08 | RAYCHEM CORPORATION (a Delaware corporation) | Compression pressure indicator |
| EP0217653A3 (en) * | 1985-09-27 | 1988-08-17 | RAYCHEM CORPORATION (a Delaware corporation) | Compression pressure indicator |
| GB2195861A (en) * | 1986-09-20 | 1988-04-13 | Messerschmitt Boelkow Blohm | External view system for training equipment |
| GB2195861B (en) * | 1986-09-20 | 1991-03-27 | Messerschmitt Boelkow Blohm | External view system for training equipment |
| FR2644529A1 (en) * | 1989-03-17 | 1990-09-21 | Kyodo Denki | DEVICE FOR INDICATING INCOMPLETE FASTENING AND COMPLETE FASTENING OF ELEMENTS TO BE SECURED |
| EP0395929A1 (en) * | 1989-04-29 | 1990-11-07 | BWM Dübel + Montagetechnik GmbH | Supporting bar for a carrying rail of a wall-or ceiling covering |
| US5954010A (en) * | 1996-09-19 | 1999-09-21 | Lucent Technologies Inc. | Temperature sensing device for permanently indicating when a product is exposed to critical temperatures |
| US6561124B1 (en) * | 1998-11-13 | 2003-05-13 | Business Lines Limited | Position indicator assembly for nuts and or bolts |
| US6279242B1 (en) | 1999-09-13 | 2001-08-28 | Swagelok Company | Intrinsic gauging for tube fittings |
| US6502323B2 (en) | 1999-09-13 | 2003-01-07 | Swagelok Company | Intrinsic gauging for tube fittings |
| US6640457B2 (en) | 1999-09-13 | 2003-11-04 | Swagelok Company | Intrinsic gauging for tube fittings |
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