CA1066177A - Flexible screw anchor - Google Patents
Flexible screw anchorInfo
- Publication number
- CA1066177A CA1066177A CA268,192A CA268192A CA1066177A CA 1066177 A CA1066177 A CA 1066177A CA 268192 A CA268192 A CA 268192A CA 1066177 A CA1066177 A CA 1066177A
- Authority
- CA
- Canada
- Prior art keywords
- funnel
- fastener device
- workpiece
- wall portion
- extending
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004873 anchoring Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 7
- 230000003313 weakening effect Effects 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000011161 development Methods 0.000 description 7
- 230000018109 developmental process Effects 0.000 description 7
- 239000002184 metal Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 239000011093 chipboard Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920002994 synthetic fiber 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
- 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"
-
- 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
- F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
- F16B37/041—Releasable devices
- F16B37/043—Releasable devices with snap action
-
- 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
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
- F16B5/025—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread specially designed to compensate for misalignement or to eliminate unwanted play
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
- Joining Of Building Structures In Genera (AREA)
- Connection Of Plates (AREA)
Abstract
ABSTRACT
Disclosed is an insert element for fastening purposes consisting of an elastically deformable material and having an outer contour serving for anchoring in a workpiece opening and a reception opening cooperating with a fastening element, preferably a screw. The reception opening is defined by a funnel-shaped radially deformable inner portion of the insert element.
Disclosed is an insert element for fastening purposes consisting of an elastically deformable material and having an outer contour serving for anchoring in a workpiece opening and a reception opening cooperating with a fastening element, preferably a screw. The reception opening is defined by a funnel-shaped radially deformable inner portion of the insert element.
Description
1o66~77 F~EXI3LE SCREli~ ANCH~:)R
The innovation relates to an insert element for fastening - purposes consisting of elastically deformable material having an outer contour serving to anchor the element in a workpiece opening and a reception opening cooperating with a fastening element, preferably a screw.`
Insert elements in the form of plug-in type nuts, dowels or the like are known from many instances. They are normally inserted in a rough-bored opening of a workpiece and serve to receive a fastening element, preferably a screw or the like which is received in the re^eption opening of the insert element. The known insert or plug-in type elements are normally formed in one piece and normally consist o~ a head and a shank portion, wherein the shank portion may comprise two or more legs which are urged against the wall of the opening when the screw, for example, is introduced while being rotated,.and thereby in the manner
The innovation relates to an insert element for fastening - purposes consisting of elastically deformable material having an outer contour serving to anchor the element in a workpiece opening and a reception opening cooperating with a fastening element, preferably a screw.`
Insert elements in the form of plug-in type nuts, dowels or the like are known from many instances. They are normally inserted in a rough-bored opening of a workpiece and serve to receive a fastening element, preferably a screw or the like which is received in the re^eption opening of the insert element. The known insert or plug-in type elements are normally formed in one piece and normally consist o~ a head and a shank portion, wherein the shank portion may comprise two or more legs which are urged against the wall of the opening when the screw, for example, is introduced while being rotated,.and thereby in the manner
- 2-. F
~066~7 of a talon additionally fasten the insert element in the workpiece.
The most frequently used insert element or plug-in type nut normally comprises two legs formed integrally wi~h a head plate. When driving-in the fastening means such as a screw, the legs are urged outwards against the wall of the opening, with the screw being encompassed in the region of the flexi~le legs in a segment-like manner only and the latter being urged against the screw through their own bias only. The main dis-advantage of the kno~m plug-in type elements, however, resides in that the axis of the screw hole has got to coincide with the axis of the screw. Oblique screwings are possible with such plug-in type nuts only if the axis of the screw hole is at angles with respect to the normal direction of fastening of the plug-in type nut. But here as well the axis of the screw hole and the axis of the fastening means must coincide which is brought about only by a certain angular position of the plug-in type nut.
The innovation is based upon the problem of providing an insert element for fastening purposes in which the fastening element may be inserted at any acute angle with respect to the insert element.
With an insert element of the type mentioned at the beginning this problem is solved in that the reception openlng is defined by a funnel-shaped, radially deformable :inner portion ~066~77 of the insert element.
, With the insert element according to the innovation the reception opening or screw hole is formed conically, the diameter of introduction being essentially greater than the diameter of the fastening element which, for example, may be a self-forming screw. As the funnel-shaped portion is elastically deformabls there ~ill result upon the screw being driven in a deformation of the funnel-shaped portion which will be dra~m in a direction towards the screw head and thereby will guarantee an encompassing of the fastening element depending upon the ti~hteni~g force of the screw. A pre-requisite to obtain the effect aimed at of introducing ~
fastening element also at an oblique angle &part from the elastic deformability of the funnel-shaped portions consists in that the latter be furthermore afforded an opportunity sufficiently to deform itself because the lower part of the funnel-shaped portion preferably will become aligned a~ially of the aY.is of the screw element positively upon the iastening element being driven in. In connection with this there results a relatively strong radial deviation of the corresponding portion of the funnel-shaped portion which, however, will be possible only if there is nothing to obstruct the radial deviation.
~ith the aid of the innovation, an insert element has thus been provided which is capable of adapting itself to the respective obli~ue position of a fastening element, for examplea scre~i, while simultaneously well encompassing the scre~
~ .
~06617'7 .
From this there results also a technical advantage of the lnnovation from a mounting point of view insofar as the plug-in type nut according to the innovation no longer has to be exactly--oriented with respect to the axis of the screw as had to be the case with the previously used plug-in type nuts.
Provision is made in one further development of the innovation for one outer wall portion to be connected with the funnel-shaped inner portion through an axially limited connection portion only in such a manner that the inner portion may be pivoted with respect to the outer wall portion. The outer wall portion may be of different axial lengths but with thinner workpiece plates, ho~Jever, at least must extend a distance at least slightly in excess of the workpiece thick-ness. The funnel portion which is either longer or shorter than the outer wall portion, depending upon the purpose for which it is used, will be situated radially within the outer wall portion and will be connected with the latter through a pivotal connection only so as to guarantee deformability of the funnal portion with an obliquely applied fastening element.
The connection portion preferably is dispoed within the head region of the insert element, because the strongest radial deviation of the funnel portion takes place at the free end.
In accordance with another further development of the innovation provision is made for the funnel portion to be of approximately equal wall thickness over the length thereof. But it is also possible to vary the wall thickness over the length in which, ~066~77 however, a sufficient degree of axial deformability of the funnel portion must be secured in any case with an obliquely applied fastening element, and simultaneously a sufficient force of retention against withdrawal of the fastening element from the funnel portion and of preventing the latter from turning inside out.
As already mentioned above the funnel portion is designed in such a manner that it on the one hand has a sufficient degree of inherent flexibi~ty to adapt itself to the respective oblique position of the screw and that it on the other hand secures good encompassing of the screw. In this connection, provision is made in another embodiment of the innovation for a constant diameter end portion to join the funnel portion, said constant diameter being preferably equal to the smallest diameter of the funnal portion. A particularly effective encompassing of the screw, accordingly, takes place in the constant diameter end portion.
It may indeed be imagined that the funnel portion might be formed of several separate, elastically deformable branches or legs, In order to secure, however, a sufficient degree of strength, provision is made in accordance with a~ther embodi-~ent of the innovation for the funnel portion to be formed ofa closed circumferentially extending funnel wall which is weakened at circumferentiaIly spaced intervals. In this manner there will be obtained an effective fastening of a screw while, however, the weakenings take care to avoid any tearing which might occur in the lower portion caused by too ~ligh a _ ~ _ tangential stress. In accordance with another further develop-ment of the innovation the weakenings may be in the form of longitudinally extending grooves pointing towards the reception opening, said grooves preferably ~orming membrane-like elon-gation portions. ln this arrangement the weakenings of the funnel portion have a shorter peripheral length than the portions disposed therebetween.
The insert element according to the innovation may be employed for workpieces of different materials, for example, for an interconnecting construction for plate-shaped workpieces of wood, chip board or the like. In this connection, the inno-vation in one embodiment thereof provides for the outer wall portion to be designed in the form of a sQw-toothing. The teeth take care of an effective anchoring in a bore, for example, a blind bore in a wood plate. Such an anchoring, however, is important because the driving-in of the fastening element does not contribute anything towards a reinforcement of this anchoring. In order to secure the insert element against rotation, provision is made in another further development of the innovation for the outer wall portion to comprise outside flattenings extending in parallel with the axis.
The last-d~scribed embodiment of an insert element is particu-larly suited for connections of parts of furniture or the like.
But there are quite a few cases of application where the insert element is to be inserted into relative~y thin workpieces such as sheet metal for example. In this connection, provision is made in another further development of the innovation ~or the 1066~77 outer wall portion to comprise a head having a contact surface lying closely against the workpiece surface, and for inter-locking means to be provided in addition which are adapted to be brought $nto engagement with the underside of the workpiece.
Such a further development of the insert element according to the innovation makes it possible to use self-forming screws even in cases of application where they are not normally employed.
So that sufficient coverage of the fastening screw may be obtained, the axial length of the funnel portion in case of insertion in sheet metal material or the like exceeds the length of the openings in which the element is to be anchored.
The anchoring or interlocking in this case may again be effected in different ways. In one further embodiment of the lnnovation provision is made for the outer wall portion to comprise two or more spring legs having an undercut engaged by the opening edge averted from the head. The spring legs in this arrangement take care of a spanning of the insert element, in that the workpiece "is clamped in" from opposite sides of the workpiece.With another further development of the innovation provision is made for the outer wall portion to comprise two or more spring leg~. which are bent outwards and back again at the lower end thereof and which by their ~ee ends get into engagement with the opening edge averted from the head. With this embodiment, so-called expansion feet take care of an irreproachable positioning in the hole, with extraordinarily high tightening forces being obtained. - 8 -106617~
In all the cases where snapping feet or expansion feet are utilized to anchor the insert element according to the in-novation, it is advantageous to Provide radially extending arresting cams between the spring legs integrally formed with the funnel portion and/or with the head which permit of a better positioning in the fastening aperture.
A third possibility of anchoring in the workpiece according to the innovation consists in that there are four projections in-tegrally formed with the head forming a square and in that there are another four pro~ections forming a square, formed integrally with thelhead or the outer wall portion which are axially sl>aced from and offset by 45 with respect to the first pro~ections.
This embodiment in the first place is for quadratic fastening apertures, with the insert ele~.ent when inserted being ~ositive-ly interlocked in the quadratic aperture by rotation thereof through 45.
Thus broadly, the invention contemplates a fastener device which is formed of an elastically deformable material and which in-cludes a workpiece anchoring portion having an outer wall portion adapted for anchoring to a workpiece opening and having a gener-ally axially extending opening adapted for receiving and co-operating with a fastening element. The opening which is defined by a radially deformable inwardly extending element has an in-wardly extending funnel-shaped portion connected at its diametr-ically larger end with the outer wall portion of the workpiece anchoring portion, and the element has an inner portion of constant diameter extending inwardly from and of substantially the same diameter as an inner end of the funnel-shaped portion.
In the following, some exemplary embodiment of the innovation
~066~7 of a talon additionally fasten the insert element in the workpiece.
The most frequently used insert element or plug-in type nut normally comprises two legs formed integrally wi~h a head plate. When driving-in the fastening means such as a screw, the legs are urged outwards against the wall of the opening, with the screw being encompassed in the region of the flexi~le legs in a segment-like manner only and the latter being urged against the screw through their own bias only. The main dis-advantage of the kno~m plug-in type elements, however, resides in that the axis of the screw hole has got to coincide with the axis of the screw. Oblique screwings are possible with such plug-in type nuts only if the axis of the screw hole is at angles with respect to the normal direction of fastening of the plug-in type nut. But here as well the axis of the screw hole and the axis of the fastening means must coincide which is brought about only by a certain angular position of the plug-in type nut.
The innovation is based upon the problem of providing an insert element for fastening purposes in which the fastening element may be inserted at any acute angle with respect to the insert element.
With an insert element of the type mentioned at the beginning this problem is solved in that the reception openlng is defined by a funnel-shaped, radially deformable :inner portion ~066~77 of the insert element.
, With the insert element according to the innovation the reception opening or screw hole is formed conically, the diameter of introduction being essentially greater than the diameter of the fastening element which, for example, may be a self-forming screw. As the funnel-shaped portion is elastically deformabls there ~ill result upon the screw being driven in a deformation of the funnel-shaped portion which will be dra~m in a direction towards the screw head and thereby will guarantee an encompassing of the fastening element depending upon the ti~hteni~g force of the screw. A pre-requisite to obtain the effect aimed at of introducing ~
fastening element also at an oblique angle &part from the elastic deformability of the funnel-shaped portions consists in that the latter be furthermore afforded an opportunity sufficiently to deform itself because the lower part of the funnel-shaped portion preferably will become aligned a~ially of the aY.is of the screw element positively upon the iastening element being driven in. In connection with this there results a relatively strong radial deviation of the corresponding portion of the funnel-shaped portion which, however, will be possible only if there is nothing to obstruct the radial deviation.
~ith the aid of the innovation, an insert element has thus been provided which is capable of adapting itself to the respective obli~ue position of a fastening element, for examplea scre~i, while simultaneously well encompassing the scre~
~ .
~06617'7 .
From this there results also a technical advantage of the lnnovation from a mounting point of view insofar as the plug-in type nut according to the innovation no longer has to be exactly--oriented with respect to the axis of the screw as had to be the case with the previously used plug-in type nuts.
Provision is made in one further development of the innovation for one outer wall portion to be connected with the funnel-shaped inner portion through an axially limited connection portion only in such a manner that the inner portion may be pivoted with respect to the outer wall portion. The outer wall portion may be of different axial lengths but with thinner workpiece plates, ho~Jever, at least must extend a distance at least slightly in excess of the workpiece thick-ness. The funnel portion which is either longer or shorter than the outer wall portion, depending upon the purpose for which it is used, will be situated radially within the outer wall portion and will be connected with the latter through a pivotal connection only so as to guarantee deformability of the funnal portion with an obliquely applied fastening element.
The connection portion preferably is dispoed within the head region of the insert element, because the strongest radial deviation of the funnel portion takes place at the free end.
In accordance with another further development of the innovation provision is made for the funnel portion to be of approximately equal wall thickness over the length thereof. But it is also possible to vary the wall thickness over the length in which, ~066~77 however, a sufficient degree of axial deformability of the funnel portion must be secured in any case with an obliquely applied fastening element, and simultaneously a sufficient force of retention against withdrawal of the fastening element from the funnel portion and of preventing the latter from turning inside out.
As already mentioned above the funnel portion is designed in such a manner that it on the one hand has a sufficient degree of inherent flexibi~ty to adapt itself to the respective oblique position of the screw and that it on the other hand secures good encompassing of the screw. In this connection, provision is made in another embodiment of the innovation for a constant diameter end portion to join the funnel portion, said constant diameter being preferably equal to the smallest diameter of the funnal portion. A particularly effective encompassing of the screw, accordingly, takes place in the constant diameter end portion.
It may indeed be imagined that the funnel portion might be formed of several separate, elastically deformable branches or legs, In order to secure, however, a sufficient degree of strength, provision is made in accordance with a~ther embodi-~ent of the innovation for the funnel portion to be formed ofa closed circumferentially extending funnel wall which is weakened at circumferentiaIly spaced intervals. In this manner there will be obtained an effective fastening of a screw while, however, the weakenings take care to avoid any tearing which might occur in the lower portion caused by too ~ligh a _ ~ _ tangential stress. In accordance with another further develop-ment of the innovation the weakenings may be in the form of longitudinally extending grooves pointing towards the reception opening, said grooves preferably ~orming membrane-like elon-gation portions. ln this arrangement the weakenings of the funnel portion have a shorter peripheral length than the portions disposed therebetween.
The insert element according to the innovation may be employed for workpieces of different materials, for example, for an interconnecting construction for plate-shaped workpieces of wood, chip board or the like. In this connection, the inno-vation in one embodiment thereof provides for the outer wall portion to be designed in the form of a sQw-toothing. The teeth take care of an effective anchoring in a bore, for example, a blind bore in a wood plate. Such an anchoring, however, is important because the driving-in of the fastening element does not contribute anything towards a reinforcement of this anchoring. In order to secure the insert element against rotation, provision is made in another further development of the innovation for the outer wall portion to comprise outside flattenings extending in parallel with the axis.
The last-d~scribed embodiment of an insert element is particu-larly suited for connections of parts of furniture or the like.
But there are quite a few cases of application where the insert element is to be inserted into relative~y thin workpieces such as sheet metal for example. In this connection, provision is made in another further development of the innovation ~or the 1066~77 outer wall portion to comprise a head having a contact surface lying closely against the workpiece surface, and for inter-locking means to be provided in addition which are adapted to be brought $nto engagement with the underside of the workpiece.
Such a further development of the insert element according to the innovation makes it possible to use self-forming screws even in cases of application where they are not normally employed.
So that sufficient coverage of the fastening screw may be obtained, the axial length of the funnel portion in case of insertion in sheet metal material or the like exceeds the length of the openings in which the element is to be anchored.
The anchoring or interlocking in this case may again be effected in different ways. In one further embodiment of the lnnovation provision is made for the outer wall portion to comprise two or more spring legs having an undercut engaged by the opening edge averted from the head. The spring legs in this arrangement take care of a spanning of the insert element, in that the workpiece "is clamped in" from opposite sides of the workpiece.With another further development of the innovation provision is made for the outer wall portion to comprise two or more spring leg~. which are bent outwards and back again at the lower end thereof and which by their ~ee ends get into engagement with the opening edge averted from the head. With this embodiment, so-called expansion feet take care of an irreproachable positioning in the hole, with extraordinarily high tightening forces being obtained. - 8 -106617~
In all the cases where snapping feet or expansion feet are utilized to anchor the insert element according to the in-novation, it is advantageous to Provide radially extending arresting cams between the spring legs integrally formed with the funnel portion and/or with the head which permit of a better positioning in the fastening aperture.
A third possibility of anchoring in the workpiece according to the innovation consists in that there are four projections in-tegrally formed with the head forming a square and in that there are another four pro~ections forming a square, formed integrally with thelhead or the outer wall portion which are axially sl>aced from and offset by 45 with respect to the first pro~ections.
This embodiment in the first place is for quadratic fastening apertures, with the insert ele~.ent when inserted being ~ositive-ly interlocked in the quadratic aperture by rotation thereof through 45.
Thus broadly, the invention contemplates a fastener device which is formed of an elastically deformable material and which in-cludes a workpiece anchoring portion having an outer wall portion adapted for anchoring to a workpiece opening and having a gener-ally axially extending opening adapted for receiving and co-operating with a fastening element. The opening which is defined by a radially deformable inwardly extending element has an in-wardly extending funnel-shaped portion connected at its diametr-ically larger end with the outer wall portion of the workpiece anchoring portion, and the element has an inner portion of constant diameter extending inwardly from and of substantially the same diameter as an inner end of the funnel-shaped portion.
In the following, some exemplary embodiment of the innovation
3~ will be described in more detail by way of the drawings:
FI~.. 1 shows a sectional view of the insert element according to the innovation in connection with a workpiece, ,~ _ g 106617~7 Fig. 2 shows a top plan view of the arrangement according to Fig. 1, Fig. 3 shows another workpiece connected with the workpiece accord~ng to Fig. 1, Fig. 4 shows a sectional view of another embodjment of '' the innovation, Fig. 5 shows a top plan vie~ taken in the direction of the arrow X, Fig. ~ shows a sectional view of anothe~ embodiment of the innovation, Fig. 7 shows a view of the element according to Fig.
taken in the direction of the arrow Y, Fig. 8 shows a sectional view of a fourth embodiment of the innovation, Fig. 9 shows a view of the arrangement according to Fig.
taken in the direction of the arrow Z.
A wooden plate 10 according to Fig. 1 is provided with a blind bore 11 having a plug-in type nut 12 inserted therein, with anchoring teeth 4 of a sleeve-shaped outer wall portion 13 taking care of an effective anchoring i,n the ~ore 11.
Four rotation preventing flanges 5 (Pig. 2) which are offset from each other through 90 take care of a suffic-ient degree of safety of the Plug-in type nut 12 against rotation. A funnel nortion 1 com~rising a conical portion 15 having an oPening angle CCand a lower ~ortion 3 of constant diameter is ~ivotally connected in the upper region of the outer wall Portion 13 through a . .~.
1 o 1066177 connecting portion 14. The portion 1~ de~ines a conical screw-in opening passing o~er into a constant diameter opening in portion 3, said constant diameter ~eing equal ~o the smallest diameter of' the conical portion 15. The ~unnel 1 is composed of' f'our segments 1~ equally spaced ~'rom each ot~ler on the periphery and having a~out the same wall thi.ckness in a longitudinal direction thereof~. Between the segments 1~
there are mem~rane-like elongated portions which are formed by grooves 2.
~`igure ~ shows another plate 17 likewise o~' wood, lor example, which possesses an o~lique, stepped ~ore 18 with a screw 19 guided therethrough. The screw head 20 is countersun~ in the portion of maximum diameter, while the lower region o~ the self'-~'orming shank 21 cooperates with the screw hole o~' the ~'unnel 1, wi~h the ~'unnel walls ~eing strongly de~ormed ~ecause the screw strives to de~'orm the elas~ic material in such a manner that it is oriented in parallel with respect to the axis of the screw.
But there is yet obtained a high degree of coverage of thread due to the end portion 16, in particular, so that the work-pieces 10 and 17 may be securely connected with each other.
Figures 4 and 5 show a sheet metal plate 22 with a square hole 2~ to receive a plug-Ln type nut 24. The latter in its turn possesses an inner funnel 25 which is formed in a similar manner as the funnel 1 of the plug-in type nut acc.ording to Figures 1 and 2. But in the present case it is formed integrally with a hea~ plate 2~ which forms a do~nwardly projecting sq~are 27 at the underside thereof. As will be seen from Figure 5, there are furthermore provided at the head 2~ rectangular projeotions 2~ defining another square and offset by 45 with respect to the corners of the square 27. Besides, the pro-jections Z8 are axially offset with respect to the souare 27, so that through rotation of the entire plug-in type nut 24 the latter may be positively interlocked in the square hole 23.
Figures ~ and 7 show a plug-in type nut 3O of a design similar to tha-t according to Figures 4 and 5 as far as the funnel 31 an~
the head pl~te 32 are concerned. Snapping feet7serve ~r a~horing in a sheet met~1 plate 33 having a square opening ~4, said snap-ping feet being provided with an undercut ~5 for the purpose O,T
exerting clamping forces from opposite sides of the sheet metal plate 33. As may be seen from Figure 7, there are pro-vided two diametrically opposed snapping feet 7. Arresting cams 8 are provided at the two other sides of the plug-in type nut which come to lie closely against the ~rall of the hole 34, so that the plug-in type nut 3O is effectively positioned.
Figures 8 and 9 show a sheet metal plate 3~ provided ~itn a square opening 37 havir.g a plug-in type nut 3~ inserted -chere.
in which again resembles the plug-in type nut according to Figures ~ and 7. The funnel 39 too is of the same desi~n, so that a more detailed description of this part may be omitted.
Two diametrioally opposed spring legs 10 are provided to anchor the plug-in type nu-t 38 in the square hole 37, said spring legs ~ _ 12 -, . .
being bent outwards and back again at the lower end thereof, with the free ends of the spring legs 10 or expansion feet coming to lie closely against the lower edge of the aperture.
The spring legs 10 permit of an extraordinarily easy assembly and are at the same time effective to bring about increased tightening forces due to the self-locking effect of the spring legs 10. Arresting cams on the two other sides of the plug-in type nut 38 take care of an improved positioning in the square hole 37.
The material used for the plug-in type nut in accordance with the innovation must be sufficiently flexible and yet guarantee a high degree of strength. Therefore, synthetic material is preferably used.
-1 2a-
FI~.. 1 shows a sectional view of the insert element according to the innovation in connection with a workpiece, ,~ _ g 106617~7 Fig. 2 shows a top plan view of the arrangement according to Fig. 1, Fig. 3 shows another workpiece connected with the workpiece accord~ng to Fig. 1, Fig. 4 shows a sectional view of another embodjment of '' the innovation, Fig. 5 shows a top plan vie~ taken in the direction of the arrow X, Fig. ~ shows a sectional view of anothe~ embodiment of the innovation, Fig. 7 shows a view of the element according to Fig.
taken in the direction of the arrow Y, Fig. 8 shows a sectional view of a fourth embodiment of the innovation, Fig. 9 shows a view of the arrangement according to Fig.
taken in the direction of the arrow Z.
A wooden plate 10 according to Fig. 1 is provided with a blind bore 11 having a plug-in type nut 12 inserted therein, with anchoring teeth 4 of a sleeve-shaped outer wall portion 13 taking care of an effective anchoring i,n the ~ore 11.
Four rotation preventing flanges 5 (Pig. 2) which are offset from each other through 90 take care of a suffic-ient degree of safety of the Plug-in type nut 12 against rotation. A funnel nortion 1 com~rising a conical portion 15 having an oPening angle CCand a lower ~ortion 3 of constant diameter is ~ivotally connected in the upper region of the outer wall Portion 13 through a . .~.
1 o 1066177 connecting portion 14. The portion 1~ de~ines a conical screw-in opening passing o~er into a constant diameter opening in portion 3, said constant diameter ~eing equal ~o the smallest diameter of' the conical portion 15. The ~unnel 1 is composed of' f'our segments 1~ equally spaced ~'rom each ot~ler on the periphery and having a~out the same wall thi.ckness in a longitudinal direction thereof~. Between the segments 1~
there are mem~rane-like elongated portions which are formed by grooves 2.
~`igure ~ shows another plate 17 likewise o~' wood, lor example, which possesses an o~lique, stepped ~ore 18 with a screw 19 guided therethrough. The screw head 20 is countersun~ in the portion of maximum diameter, while the lower region o~ the self'-~'orming shank 21 cooperates with the screw hole o~' the ~'unnel 1, wi~h the ~'unnel walls ~eing strongly de~ormed ~ecause the screw strives to de~'orm the elas~ic material in such a manner that it is oriented in parallel with respect to the axis of the screw.
But there is yet obtained a high degree of coverage of thread due to the end portion 16, in particular, so that the work-pieces 10 and 17 may be securely connected with each other.
Figures 4 and 5 show a sheet metal plate 22 with a square hole 2~ to receive a plug-Ln type nut 24. The latter in its turn possesses an inner funnel 25 which is formed in a similar manner as the funnel 1 of the plug-in type nut acc.ording to Figures 1 and 2. But in the present case it is formed integrally with a hea~ plate 2~ which forms a do~nwardly projecting sq~are 27 at the underside thereof. As will be seen from Figure 5, there are furthermore provided at the head 2~ rectangular projeotions 2~ defining another square and offset by 45 with respect to the corners of the square 27. Besides, the pro-jections Z8 are axially offset with respect to the souare 27, so that through rotation of the entire plug-in type nut 24 the latter may be positively interlocked in the square hole 23.
Figures ~ and 7 show a plug-in type nut 3O of a design similar to tha-t according to Figures 4 and 5 as far as the funnel 31 an~
the head pl~te 32 are concerned. Snapping feet7serve ~r a~horing in a sheet met~1 plate 33 having a square opening ~4, said snap-ping feet being provided with an undercut ~5 for the purpose O,T
exerting clamping forces from opposite sides of the sheet metal plate 33. As may be seen from Figure 7, there are pro-vided two diametrically opposed snapping feet 7. Arresting cams 8 are provided at the two other sides of the plug-in type nut which come to lie closely against the ~rall of the hole 34, so that the plug-in type nut 3O is effectively positioned.
Figures 8 and 9 show a sheet metal plate 3~ provided ~itn a square opening 37 havir.g a plug-in type nut 3~ inserted -chere.
in which again resembles the plug-in type nut according to Figures ~ and 7. The funnel 39 too is of the same desi~n, so that a more detailed description of this part may be omitted.
Two diametrioally opposed spring legs 10 are provided to anchor the plug-in type nu-t 38 in the square hole 37, said spring legs ~ _ 12 -, . .
being bent outwards and back again at the lower end thereof, with the free ends of the spring legs 10 or expansion feet coming to lie closely against the lower edge of the aperture.
The spring legs 10 permit of an extraordinarily easy assembly and are at the same time effective to bring about increased tightening forces due to the self-locking effect of the spring legs 10. Arresting cams on the two other sides of the plug-in type nut 38 take care of an improved positioning in the square hole 37.
The material used for the plug-in type nut in accordance with the innovation must be sufficiently flexible and yet guarantee a high degree of strength. Therefore, synthetic material is preferably used.
-1 2a-
Claims (15)
1. A fastener device formed of an elastically de-formable material including a workpiece anchoring portion having an outer wall portion adapted for anchoring to a workpiece opening and having a generally axially extending opening adapted for receiving and cooperating with a fastening element, the opening being defined by a radially deformable inwardly extending element having an inwardly extending funnel-shaped portion connected at its diametrically larger end with the outer wall portion of said workpiece anchoring portion, and said element having an inner portion of constant diameter extending inwardly from and of substantially the same diameter as an inner end of said funnel-shaped portion.
2. The fastener device according to Claim 1, characterized in the funnel-shaped portion being connected with said outer wall portion via an axially limited connection portion whereby the funnel-shaped portion is pivotable with respect to the outer wall portion.
3. The fastener device according to Claim 1 or Claim 2, characterized in that the funnel-shaped portion is sub-stantially of the same wall thickness over its length.
4. The fastener device according to Claim 1, characterized in that the funnel-shaped portion is formed by a self-contained circumferentially extending funnel wall having circumferentially spaced weakenings.
5. The fastener device according to Claim 4, characterized in that the inner portion of said element is formed by a self-contained circumferentially extending inner wall having circumferentially spaced weakenings.
6. The fastener device according to Claim 5, characterized in that the weakenings are formed by longitudinally extending aligned grooves extending inwardly from adjacent the connection of said funnel-shaped portion and said outer wall to the inner end of said inner portion.
7. The fastener device according to Claim 4, Claim 5 or Claim 6, characterized in that the weakenings of the funnel-shaped portion are of a smaller circumferential extent than the portions interposed therebetween.
8. The fastener device according to Claim 1, Claim 2 or Claim 6, characterized in that the outer wall portion has an outer surface in the form of a saw-tooth formation.
9. The fastener device according to Claim 1, Claim 2 or Claim 6, characterized in that the outer wall portion includes rotation preventing flanges extending parallel with the axis of said device.
10. The fastener device according to Claim 1, characterized in that the outer wall portion comprises a head having a contact surface adapted for lying in close contact against a workpiece surface, and said device having workpiece interlocking means associated with said head which are adapted to be brought into engagement with an underside surface of the workpiece.
11. The fastener device according to Claim 10, characterized in that the outer wall portion adjacent said head includes at least two snapping feet having an undercut adapted for engagement with the underside surface of the workpiece adjacent an edge of the workpiece opening.
12. The fastener device according to Claim 10, characterized in that the outer wall portion adjacent said head includes at least two spring legs which are bent out-wardly and back again at the lower ends thereof which lower ends are adapted for engagement with the underside surface of the workpiece adjacent an edge of the workpiece opening.
13. The fastener device according to Claim 11, characterized in that there are radially extending arresting cams formed integrally with one of the funnel-shaped portion and the head between the snapping feet.
14. The fastener device according to Claim 12, characterized in that there are radially extending arresting cams formed integrally with one of the funnel-shaped portion and the head between the spring legs.
15. The fastener device according to Claim 10, characterized in that there are four projections formed integrally with the head defining a square and further that there are four other projections defining a square formed integrally with one of the head and the outer wall portion, which other projections are axially spaced and offset from the first four projections through 45°.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19767608723 DE7608723U (en) | 1976-03-20 | Insert element for fastening purposes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1066177A true CA1066177A (en) | 1979-11-13 |
Family
ID=6663405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA268,192A Expired CA1066177A (en) | 1976-03-20 | 1976-12-17 | Flexible screw anchor |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5819367Y2 (en) |
| AU (1) | AU2119377A (en) |
| CA (1) | CA1066177A (en) |
| ES (1) | ES226767Y (en) |
| FR (1) | FR2344739A1 (en) |
| GB (1) | GB1566919A (en) |
| IT (1) | IT1077362B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI667419B (en) * | 2018-06-08 | 2019-08-01 | 上得國際貿易有限公司 | Connecting device and combined structure including connecting device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2429833A (en) * | 1944-03-21 | 1947-10-28 | Richard W Luce | Fastening means |
| DE1094049B (en) * | 1958-05-31 | 1960-12-01 | Opel Adam Ag | Nut made of plastic |
| FR1260534A (en) * | 1959-06-25 | 1961-05-05 | George Goodman Ltd | Improvements to screw locking devices |
| DE1400851A1 (en) * | 1963-10-17 | 1968-12-12 | Jllinois Tool Works Inc | Fastener |
| JPS5228325Y2 (en) * | 1971-08-13 | 1977-06-28 |
-
1976
- 1976-12-17 CA CA268,192A patent/CA1066177A/en not_active Expired
-
1977
- 1977-01-10 AU AU21193/77A patent/AU2119377A/en not_active Expired
- 1977-01-14 FR FR7701134A patent/FR2344739A1/en not_active Withdrawn
- 1977-02-28 ES ES1977226767U patent/ES226767Y/en not_active Expired
- 1977-03-15 IT IT2123377A patent/IT1077362B/en active
- 1977-03-17 JP JP1977031538U patent/JPS5819367Y2/en not_active Expired
- 1977-03-17 GB GB1144977A patent/GB1566919A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IT1077362B (en) | 1985-05-04 |
| AU2119377A (en) | 1978-07-20 |
| JPS5819367Y2 (en) | 1983-04-21 |
| ES226767U (en) | 1977-05-16 |
| FR2344739A1 (en) | 1977-10-14 |
| ES226767Y (en) | 1977-11-01 |
| GB1566919A (en) | 1980-05-08 |
| JPS52125669U (en) | 1977-09-24 |
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