GB2124726A - Anchors for securing by expansion - Google Patents

Anchors for securing by expansion Download PDF

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Publication number
GB2124726A
GB2124726A GB08320147A GB8320147A GB2124726A GB 2124726 A GB2124726 A GB 2124726A GB 08320147 A GB08320147 A GB 08320147A GB 8320147 A GB8320147 A GB 8320147A GB 2124726 A GB2124726 A GB 2124726A
Authority
GB
United Kingdom
Prior art keywords
anchor
apertures
workpiece
fastener
stack
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Withdrawn
Application number
GB08320147A
Other versions
GB8320147D0 (en
Inventor
Gene S Kunos
Francis C Peterson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US40316982A priority Critical
Application filed by Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Publication of GB8320147D0 publication Critical patent/GB8320147D0/en
Publication of GB2124726A publication Critical patent/GB2124726A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/04Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F16B37/048Non-releasable devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/02Nuts or like thread-engaging members made of thin sheet material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B37/00Nuts or like thread-engaging members
    • F16B37/12Nuts 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

Abstract

An anchor 11 may be formed as a stamping 10 including a plurality of plate-like elements 12, 13, 14 and 15 to be arranged in a stack. The elements have apertures 22, 23, 24 and 25 which are at least partially overlapping in the stack so that the insertion of a fastener 27 into the stack causes lateral movement of at least a portion of each element 12, 13, 14 and 15 into engagement with the low-density material 31. Other anchors are disclosed with different apertures and with the connecting tabs 17 replaced by an elastomeric material. <IMAGE>

Description

SPECIFICATION Anchors for securing by expansion The present invention relates generally to anchors for securing by expansion and particularly to anchors for use in low density material.

Low density material, such as expanded synthetic resinous material, is being used in a significantly increasing number of applications because it combines light weight, rigidity, low cost and ease of formation. Fastening to such material has been a significant obstacle to its more widespread use because such material has not been capable of securely holding conventional fasteners. While the present invention is particularly useful in its application with low density material its usefulness is not limited thereto. Indeed, an anchor embodying the present invention can be used to great advantage in a wide variety of conventional materials.

According to the present invention, an anchor for securing by expansion comprises a plurality of plate-like elements arranged in a stack, said elements each having an aperture, and there being means connecting said elements and flexibly holding said apertures in at least partially overlapping alignment whereby, in use, insertion of an elongate fastener into said apertures causes lateral movement of at least a portion of each of said elements towards a surrounding workpiece.

In one embodiment, each of said apertures is pear-shaped having a wide end and a narrow end, said narrow end having a centre which generally coincides with the centre of its corresponding element. In another embodiment, each of said apertures is intersected by a slot which divides said element into two portions, and said elements may then be flexibly held such that said apertures are in fully overlapping alignment. In yet another embodiment, each of said apertures is arcuate and has fastener-engageable serrations.

Preferably, said means includes a tab between each adjacent pair of said elements in said stack so that said anchor may be formed as a stamping, but it is possible for said means to include elastomeric material. If said elastomeric material encapsulates said elements it may resist rotation of said anchor in said workpiece, and may resist engagement of said anchor with said workpiece at other than a predetermined depth in said workpiece, but these functions may be better undertaken by legs projecting symmetrically from the periphery of the uppermost element in said stack. It is desirable for there to be a substantially symmetrical pattern of engagement of said elements in said workpiece after insertion of said fastener.

Several anchors in accordance with the present invention, which are both effect and economical to manufacture, will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure lisa plan view of one embodiment of the present invention showing the anchor before the elements are arranged in a stack; Figure2 is an elevational view in partial section of the embodiment of Figure 1 showing the anchor in a typical environment prior to insertion of a fastener; Figure 3 is a plan sectional view taken along line 3-3 in Figure 2; Figure 4 is an elevational view in partial section of the embodiment of Figure 1 showing the anchor in a typical environment after engagement with a workpiece; Figure 5 is a plan sectional view taken along line 5-5 of Figure 4;; Figure 6 is a plan view of an alternative embodiment of the present invention showing the anchor before the elements are arranged in a stack; Figure 7 is an elevational view in partial section of the embodiment of Figure 6 also showing part of a workpiece; Figure 8 is a schematic plan view of the embodiment of Figure 6 prior to insertion of a fastener; Figure 9 is a schematic plan view of the embodiment of Figure 6 after engagement with a workpiece; Figure 10 is a sectional view of a third embodiment of the present invention also showing a workpiece; Figure 11 is a plan view of a fourth embodiment of the present invention; and Figure 12 is an elevational view in partial section of the embodiment of Figure 11 after engagement with a workpiece.

Referring now to the drawings, wherein like numerals have been employed to designate similar parts throughout, Figures 1 to 5 show an anchor according to the present invention formed as stamping.

The stamping 10 includes four plate-like elements designated 12,13,14 and 15. The elements have pear-shaped apertures 22,23,24 and 25 respectively.

Each aperture has a narrow end designated by the reference "a" and a wider end designated by the reference "b". The elements are connected by tabs 17. The uppermost element 12 has legs 18. Figure 1 shows the stamping in unfolded form while Figure 2 shows the stamping folded to form the anchor 11.

Figure 2 shows the anchor 11 in its typical environment wherein it is used to fasten an article 29 to a workpiece formed of low density material 31.

The anchor as shown in Figure 2 is in its unexpanded condition. Figure 3 is a plan view in partial section of the anchor shown in Figure 2. The apertures 22,23,24 and 25 are shown in partially overlapping alignment.

In the unexpanded condition it is the narrow ends "a" of the apertures which overlap.

Figure 4 shows the anchor 11 in its expanded condition. A fastener 27 is inserted into the apertures of the elements to move the elements laterally into the walls of the hole 33 thereby causing engagement between the anchor 11 and the material 31. It should be noted that a threaded tapering fastener is preferably used with an anchor of the present invention. A screw with a gimlet point is an example of such a fastener. However, the fastener need not necessarily be a screw.

Figure 5 is a plan view in partial section of the anchor shown in Figure 4. The insertion of the fastener 27 into the apertures 22,23,24 and 25 has caused the wider ends "b" of the apertures to become aligned. The elements 12,13,14 and 15 have, as a consequence, been forced into engagement with the material 31. The engagement of the elements with the material 31 is preferably at equidistant intervals about the hole 33 to provide symmetry of engagement as shown in Figure 5. In order to achieve this symmetry, it may be necessary to orient the apertures in a predetermined relationship. Since the elements rotate about the connecting tabs 17 when they are moved laterally by the insertion of the fastener 27, their movement is somewhat restricted.

The orientation and placement of the apertures which will result in symmetrical engagement depends upon the location of the tabs 17, the size and shape of the apertures, the number of elements and the size of the fastener used.

Figure 1 shows an arrangement of the apertures 22,23,24 and 25 which will result in symmetrical engagement of the plates upon insertion of a fastener. A line through the centres of elements 12 and 13 is at an angle of about 70 with the longitudinal axes of both apertures 22 and 23.

Similarly a line connecting the centres of elements 14 and 15 is at an angle of about 70" with the longitudinal axes of apertures 24 and 25. Furthermore, those two lines are generally parallel and are at an angle of approximately 100 "with a line connecting the centres of plates 13 and 14. In all cases the tab 17 connecting adjacent plates lies along the line connecting those plates. The longitudinal axes of apertures 22,23,24 and 25 are all generally parallel when the stamping 10 is in layout form as shown in Figure 1.

It should be noted that the centres of the elements 12,13,14 and 15 generally coincide with points representing the centres of the narrow ends "a" of the apertures 22,23,24 and 25, respectively. The resulting configuration of the apertures when the stamping 10 is folded to form an anchor 11 is indicated by the dotted lines in Figure 3. After insertion of the fastener 27 the configuration of the apertures is that shown in Figure 5, wherein the longitudinal axes of apertures 22 and 23 are generally parallel to each other and the longitudinal axes of apertures 24 and 25 are also generally parallel to each other. The longitudinal axes of the upper apertures 22 and 23 are generally perpendicular to the longitudinal axes of the lower apertures 24 and 25. The apertures are also oriented in four different directions.Therefore, engagement between tha anchor 11 and the material 31 is substantially symmetrical about the axis of the fastener 27. This provides the anchor 11 with a balanced resistance to axial forces exerted on the fastener 27. While the apertures shown have the preferred pear-shape, circular apertures which are at least partially overlapping may also be used. Such apertures may be desirable, for example, if engagement between the fastener 27 and the anchor 11 is more critical than engagement between the anchor 11 and the material 31.

The legs 18 are used to help assure that engage ment of the eiements 12,13,14 and 15 will occur at a predetermined depth in the hole 33. The legs 18 resist upward movement of the anchor 11 as the fastener 27 is installed. The legs 18 may also be used to resist rotation of the anchor 11. The legs 18 may be bent up at an angle so that they will resiliently engage the walls of the hole 33 when the anchor is inserted therein. It should also be noted that the legs 18 are spaced about the periphery of element 12 to allowembeddmentofa portion of the element 12 in the material 31.

Figures 6 to 9 show an alternative embodiment of the present invention. Figure 6 shows a stamping in layout form with two plate-like elements 40. Slots 42 divide the elements 40 into portions 46. Each of the elements has an aperture 44 which is intersected by its corresponding slot 42. The elements 40 are connected by a tab 17. The portions 46 are connected by respective hinges 48 which may be plastically or elastically deformable.

Figure 7 shows the stamping folded into an anchor 41 and inserted in a hole 33 in material 31. Figure 8 is a schematic plan view of the anchor 41 shown in the unexpanded condition within the hole 33. Figure 9 shows the anchor 41 in its expanded condition. The portions 46 of the elements 40 are pushed in generally opposite directions by the insertion of a fastener 27. The apertures 44 are initially somewhat oval as shown in Figure 6 so that when the fastener 27 is inserted, and the anchor 41 is expanded, the apertures 44 will generally conform to the circular shape of the fastener 27.

Figure 10 shows yet another embodiment of the present invention. The plate-like elements 12,13,14 and 15 shown in Figure 10 are flexibly held in alignment by elastomeric material 36. The elastomeric material 36 performs a similar function to that of the tabs 17 of the previously described embodiments and additionally provides the anchor with the ability to form a seal.

Figures 11 and 12 show another embodiment of the present invention wherein the apertures 50 have serrations 53 and are generally arcuate or beanshaped. In this embodiment the anchor 51 is adapted to be used with a fastener 57 which has teeth 55 which match the serrations 53. As the fastener 57 is rotated the teeth 55 engage the serrations 53 causing the plate-like elements 52 and 54to rotate in generally opposite directions about connecting tab 17. The elongate bean-shaped configuration of the apertures 50 allows considerable lateral movement of the elements 52 and 54 into the material 31.

In any of the above-described embodiments it may be desirable to use curved elements in order to improve the holding capacity of the anchor. A dish-shaped element may tend to increase its engagement with a workpiece, thereby increasing the anchor's effectiveness.

Claims (17)

1. An anchor for securing by expansion comprising a plurality of plate-like elements arranged in a stack, said elements each having an aperture, and there being means connecting said elements and flexibly holding said apertures in at least partially overlapping alignment whereby, in use, insertion of an elongate fastener into said apertures causes lateral movement of at least a portion of each of said elements towards a surrounding workpiece.
2. An anchor according to claim 1, in which each of said apertures is pear-shaped having a wide end and a narrow end, said narrow end having a centre which generally coincides with the centre of its corresponding element.
3. An anchor according to claim 1, in which each of said apertures is intersected by a slot which divides said element into two portions.
4. An anchor according to claim 3, in which said elements are flexibly held such that said apertures are in fully overlapping alignment.
5. An anchor according to claim 1, in which each of said apertures is arcuate and has fastenerengageable serrations.
6. An anchor according to any preceding claim, in which said stack and said means are such as to form a substantially symmetrical pattern of engagement of said elements in said workpiece after insertion of said fastener.
7. An anchor according to any one of claims 1 to 6, in which said elements are two in number.
8. An anchor according to any one of claims 1 to 6, in which said elements are four in number.
9. An anchor according to any one of claims 1 to 8, in which said means includes elastomeric material.
10. An anchor according to any one of claims 1 to 8, in which said means includes a tab between each adjacent pair of said elements in said stack.
11. An anchor according to claim 10 which is formed as a stamping.
12. An anchor according to any preceding claim, in which there is means for resisting rotation of said anchor in said workpiece.
13. An anchor according to any preceding claim, in which there is means for resisting engagement of said anchor with said workpiece at other than a predetermined depth in said workpiece.
14. An anchor substantially as hereinbefore described with reference to Figures 1 to 5, Figures 6 to 9, Figure 10, or Figures 11 and 12, of the accompanying drawings.
15. An anchor according to any preceding claim which has been secured in a workpiece by expansion resulting from insertion of a fastener.
16. An anchor according to claim 15, in which said workpiece is formed of a low density material.
17. An anchor according to claim 15 or claim 16, in which said fastener is threaded and tapered.
GB08320147A 1982-07-29 1983-07-26 Anchors for securing by expansion Withdrawn GB2124726A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US40316982A true 1982-07-29 1982-07-29

Publications (2)

Publication Number Publication Date
GB8320147D0 GB8320147D0 (en) 1983-08-24
GB2124726A true GB2124726A (en) 1984-02-22

Family

ID=23594723

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08320147A Withdrawn GB2124726A (en) 1982-07-29 1983-07-26 Anchors for securing by expansion

Country Status (4)

Country Link
JP (1) JPH0423129B2 (en)
DE (1) DE3327055A1 (en)
FR (1) FR2531153A1 (en)
GB (1) GB2124726A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2187810A (en) * 1986-03-15 1987-09-16 Baker & Finnemore Ltd An anchoring device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2571957B1 (en) * 1984-10-24 1989-01-06 Univ Rennes Sensor for femur collar fractures and the like
FR2583470B1 (en) * 1985-06-12 1988-01-29 Rapid Sa Nut
DE4026944A1 (en) * 1990-08-25 1992-02-27 Fischer Artur Werke Gmbh SPREADING DOWEL
DE29808462U1 (en) * 1998-05-11 1999-09-23 Fischer Artur Werke Gmbh Expansion dowels
DE102005050513B4 (en) 2005-10-21 2008-04-17 A. Raymond Et Cie Device for connecting with a screw
DE102008040677A1 (en) * 2008-07-24 2010-01-28 Hilti Aktiengesellschaft Annular disk-shaped anchoring element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB664218A (en) * 1948-09-17 1952-01-02 United Carr Fastener Corp Improvements in and relating to screw fasteners
GB819597A (en) * 1955-12-06 1959-09-09 Nienburger Metallwarenfab Gmbh Improvements relating to rivet-like connectors such as for fixing wooden seats to tubular metal chair frames
GB1232223A (en) * 1967-10-30 1971-05-19

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1954221C3 (en) * 1969-10-28 1983-12-22 National Petro-Chemicals Corp. (N.D.Ges.D. Staates Delaware ), New York, N.Y., Us
DE2722927A1 (en) * 1977-05-20 1978-11-30 Guenter Busch Firmly fixing interiorly screw threaded plastics plug - by turning it in hole to displace it w.r.t. an eccentric disc mounted at its rear end to anchor it
DE2745556A1 (en) * 1977-10-10 1979-04-19 Hilti Ag Plastics expanding wall dowel - composed of two=part plug body and fingers with connecting ribs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB664218A (en) * 1948-09-17 1952-01-02 United Carr Fastener Corp Improvements in and relating to screw fasteners
GB819597A (en) * 1955-12-06 1959-09-09 Nienburger Metallwarenfab Gmbh Improvements relating to rivet-like connectors such as for fixing wooden seats to tubular metal chair frames
GB1232223A (en) * 1967-10-30 1971-05-19

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2187810A (en) * 1986-03-15 1987-09-16 Baker & Finnemore Ltd An anchoring device
GB2187810B (en) * 1986-03-15 1990-10-17 Baker & Finnemore Ltd Anchoring device

Also Published As

Publication number Publication date
JPS5980515A (en) 1984-05-10
GB8320147D0 (en) 1983-08-24
DE3327055A1 (en) 1984-02-02
FR2531153A1 (en) 1984-02-03
JPH0423129B2 (en) 1992-04-21

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)