The present invention is a wall anchor having a novel finger configuration. This wall anchor has a head and barrel portion with a bore extending therethrough and laterally expandable fingers in general alignment with the bore. Instead of a straight channel, a channel having curved portions separates the fingers. The curved portions of the channel define ramp surfaces that at least partially extend into the path of a securing member created by the bore. Thus, when a securing member, such as a bolt, pin, screw, nail or similar object is inserted into the bore to secure the wall anchor to the wall, the securing member contacts the two ramp surfaces, separating the fingers. As the fingers separate, a portion of the fingers near the ramp surfaces deform such that the ramp surfaces rest on an outer portion of the securing member, thus providing a securing force for connecting the wall anchor to the wall and relieving stress on the area at which the fingers are connected to the barrel.
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0. 26. A wall anchor barrel, adapted to be inserted into an opening in a wall and expanded with a securing member, the barrel having a longitudinal passageway extending partly therethrough, the barrel including first and second asymmetrical fingers separated by a non-linear channel, the first and second fingers including respective first and second ramp surfaces generally facing the passageway, wherein a first angle defined between the first ramp surface and a longitudinal centerline of the passageway is different than a second angle defined between the second ramp surface and the longitudinal centerline of the passageway, wherein at least one of the ramp surfaces extends across the longitudinal centerline of the passageway, wherein the non-linear channel includes an enlarged proximal end portion located between the ramp surfaces and the longitudinal passageway; wherein the first and second ramp surfaces are oriented so that an end of the securing member inserted through the passageway passes the first ramp surface and engages the second ramp surface.
0. 32. A wall anchor barrel, adapted to be inserted into an opening in a wall and expanded with a securing member, the barrel having a longitudinal passageway extending partly therethrough, the barrel including first and second asymmetrical fingers separated by a non-linear channel, the first and second fingers including respective first and second ramp surfaces generally facing the passageway, wherein a first angle defined between the first ramp surface and a longitudinal centerline of the passageway is different than a second angle defined between the second ramp surface and the longitudinal centerline of the passageway, wherein at least one of the ramp surfaces extends across the longitudinal centerline of the passageway, wherein the non-linear channel includes an enlarged proximal end portion located between the ramp surfaces and the longitudinal passageway; wherein the first ramp surface projects less than half way across an end of the passageway so that the securing member inserted through the passageway contacts the second ramp surface before contacting the first ramp surface.
0. 12. A wall anchor barrel, adapted to be inserted into an opening in a wall and expanded with a securing member, the barrel having a longitudinal passageway extending partly therethrough, the barrel including a plurality of hinged asymmetrical fingers separated by a non-linear channel having an enlarged proximal end portion adjacent hinge portions of the fingers, at least two of the fingers having a ramp surface generally facing the passageway, the non-linear channel also including a distal end portion adjacent ends of the fingers, and a medial portion immediately adjacent the ramp surfaces between and spaced apart from the distal end portion and the enlarged proximal end portion such that the ramp surfaces are between the medial portion and the enlarged proximal end portion, each of the distal end portion and the medial portion being smaller than the enlarged proximal end portion, the enlarged proximal end portion and distal end portion being respectively located proximally and distally relative to the ramp surfaces on different sides thereof, the enlarged proximal end being located between the ramp surfaces and the longitudinal passageway and being at least as large as or larger than the longitudinal passageway; wherein the ramp surfaces are oriented so that an end of the securing member inserted through the passageway passes one of the ramp surfaces and engages the other one of the ramp surfaces.
0. 24. A wall anchor barrel, adapted to be inserted into an opening in a wall and expanded with a securing member, the barrel having a longitudinal passageway extending partly therethrough, the barrel including a plurality of hinged asymmetrical fingers separated by a non-linear channel having an enlarged proximal end portion adjacent hinge portions of the fingers, at least two of the fingers having a ramp surface generally facing the passageway, the non-linear channel also including a distal end portion adjacent ends of the fingers, and a medial portion immediately adjacent the ramp surfaces between and spaced apart from the distal end portion and the enlarged proximal end portion such that the ramp surfaces are between the medial portion and the enlarged proximal end portion, each of the distal end portion and the medial portion being smaller than the enlarged proximal end portion, the enlarged proximal end portion and distal end portion being respectively located proximally and distally relative to the ramp surfaces on different sides thereof, the enlarged proximal end being located between the ramp surfaces and the longitudinal passageway and being at least as large as or larger than the longitudinal passageway; wherein the ramp surface on a first one of the fingers projects less than half way across an end of the passageway so that the securing member inserted through the passageway contacts the ramp surface on a second one of the fingers before contacting the ramp surface on the first one of the fingers.
0. 1. A wall anchor comprising:
a barrel having a bore extending longitudinally therethrough and a plurality of fingers, at least 2 of which are asymmetrical, said fingers attached to the barrel;
wherein a non-linear channel separates the fingers, the channel defining resiliently-deformable ramp surfaces on the fingers, each ramp surface facing the bore of the barrel and at least partially extending into the path created by said bore;
wherein when a securing member is inserted into the bore, the securing member contacts the ramp faces so as to provide spreading force to the fingers, after which the ramp faces remain in contact with the securing member; and
wherein at least one finger further comprises a self-drilling portion so that the wall anchor can be inserted into a wall or support member without pre-drilling a hole into said wall or support member.
0. 2. The wall anchor of
0. 3. The wall anchor of
0. 4. The wall anchor of
0. 5. The wall anchor of
0. 6. The wall anchor of
0. 7. The wall anchor of
0. 8. The wall anchor of
0. 9. The wall anchor of
0. 10. The wall anchor of
0. 11. The wall anchor of
0. 13. The wall anchor barrel of claim 12 wherein the ramp surfaces on the fingers are staggered in distance from an end of the passageway.
0. 14. The wall anchor barrel of claim 12 wherein the enlarged proximal end portion is configured so as to increase flexibility of the hinge portions of the fingers.
0. 15. The wall anchor barrel of claim 12 wherein the ramp surfaces are resiliently deformable.
0. 16. The wall anchor barrel of claim 12 wherein the hinge portions of the fingers cooperate to define the enlarged proximal end portion of the non-linear channel therebetween.
0. 17. The wall anchor barrel of claim 12 wherein the barrel is configured such that the securing member inserted through the passageway contacts the ramp surfaces to provide a spreading force to the fingers after which the ramp surfaces remain in contact with the securing member.
0. 18. The wall anchor barrel of claim 12 wherein the ramp surfaces at least partially define at least a portion of the enlarged proximal end portion of the non-linear channel.
0. 19. The wall anchor barrel of claim 12 wherein the angle defined between a proximal one of the ramp surfaces and a longitudinal centerline of the passageway is different than the angle defined between the distal one of the ramp surfaces and the longitudinal centerline of the passageway.
0. 20. The wall anchor barrel of claim 19 wherein a proximal one of the ramp surfaces is at a steeper angle relative to the longitudinal centerline of the passageway than the distal one of the ramp surfaces.
0. 21. The wall anchor barrel of claim 12 wherein the enlarged proximal end portion comprises a bulbous opening defining the ramp surfaces.
0. 22. The wall anchor barrel of claim 12, wherein each of the fingers having a ramp surface is the same length.
0. 23. The wall anchor barrel of claim 12, wherein at least one of the ramp surfaces extends across a longitudinal centerline of the passageway.
0. 25. The wall anchor barrel of claim 24 wherein the ramp surfaces are oriented so that an end of the securing member inserted through the passageway passes one of the ramp surfaces and engages the other one of the ramp surfaces.
0. 27. The wall anchor barrel of claim 26 wherein the first ramp surface is at a steeper angle relative to the longitudinal centerline of the passageway than the second ramp surface.
0. 28. The wall anchor barrel of claim 26 wherein the first and second ramp surfaces are staggered in distance from an end of the passageway.
0. 29. The wall anchor barrel of claim 26 wherein the first and second ramp surfaces are resiliently deformable.
0. 30. The wall anchor barrel of claim 26 wherein the non-linear channel includes a bulbous opening defining the first and second ramp surfaces.
0. 31. The wall anchor barrel of claim 26 wherein the barrel is configured such that the securing member inserted through the passageway contacts the first and second ramp surfaces to provide a spreading force to the first and second fingers after which the first and second ramp surfaces remain in contact with the securing member.
0. 33. The wall anchor barrel of claim 32 wherein the first and second ramp surfaces are oriented so that an end of the securing member inserted through the passageway passes the first ramp surface and engages the second ramp surface.
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In walls formed of plaster boards, sheet rock, plywood and other relatively thin or soft materials, problems can arise when attempting to mount objects to these walls, particularly transverse rods for draperies, drapes, lighting fixtures, picture frames and other objects which impose stress upon these walls. These walls can be incapable of receiving the aforementioned rods, fixtures and frames when held in place by standard screws and bolts. Thus, it has become common practice to use anchoring sockets of some sort in order to secure these objects to a wall. A number of wall anchors are noted in the prior art, particularly U.S. Pat. Nos. 4,646,998; 4,752,170; 5,409,339; 5,533,851; and 6,086,035.
Prior art wall anchors, or back clips as they are otherwise known, such as disclosed in U.S. Pat. No. 4,669,936, teach a back clip having a body portion with a hollow barrel therein and laterally expandable fingers in alignment with the hollow barrel. The fingers extend through a wall and upon receiving a bolt, pin, screw or other securing member through the barrel, the laterally expandable fingers expand against the inside portion of the wall.
Common wall anchors, such as the one taught by U.S. Pat. No. 4,669,936, have a straight channel separating the fingers. This channel is usually narrower than the hollow barrel portion, so that when the securing member is inserted, it expands the fingers, securing the wall anchor to the wall. When these fingers are expanded they necessarily bend or hinge at some point on the finger, usually at a point at or near where each finger is connected to the hollow barrel. This hinge portion of the fingers is thus normally under some amount of stress due to the deformation that takes place in the wall anchor when the bolt, pin or screw is introduced into the wall anchor. Because of this stress, harder, more rigid plastics, the most preferred material of construction for wall anchors, tend to break in this hinge area, particularly when used in cold-weather. Softer plastics are commonly used to avoid this breakage problem, but may correspondingly reduce the strength of the wall anchor.
Referring to
It would thus be desirable to develop a wall anchor designed to reduce stress in the hinge portion of the fingers. This type of wall anchor would allow for the use of harder, more rigid plastics, resulting in a stronger anchor less susceptible to breakage.
A wall anchor has a body portion having a hollow barrel and laterally expandable fingers in general alignment with the hollow barrel. Instead of using a straight channel separating two symmetrical fingers, as is commonly used in prior art wall anchors, an asymmetrical channel is used to provide at least two ramp surfaces, one on each of a plurality of asymmetrical fingers, i.e. none of the fingers are the same shape. The ramp surfaces face the path created by the hollow portion of the barrel. Thus, when a securing member, such as a bolt, pin, screw, nail or other similar object, is inserted into the hollow barrel to secure the wall anchor to the wall, the securing member contacts the two ramp surfaces. As the securing member is pushed through the hollow barrel and into the curved channel, it separates the fingers. As the fingers separate, the ramp surfaces deform under the pressure exerted by the securing member, and then rest on an outer portion of the securing member.
This design thus allows for a redistribution of the stress from a hinge portion of the anchor to the ramp surfaces of the fingers when the fingers are separated. This allows the wall anchor to be manufactured from harder, more rigid materials, thereby improving the strength of the wall anchor and reducing its susceptibility to breaking.
Wall anchor 20 also contains a barrel 24 having a bore therethrough (shown with the bore defined by dashed lines 25) and a plurality of preferably resilient fingers, here shown in a preferred embodiment of two asymmetrical fingers 26a and 26b. The barrel 24 is attached at one end to the head 22, and the fingers are flexibly joined to the barrel 24 at the barrel's other end. The diameter of the bore through barrel 24 is preferably substantially the same size as the bore in the circular head 22. The barrel 24 is also preferably notched, as shown, so that the notches can cut into or otherwise engage the wall material when the wall anchor 20 is being pulled from the wall, so as to prevent slippage.
Channel 28 separates the asymmetrical fingers 26a and 26b. Unlike known wall anchors, a portion of channel 28 does not run down the centerline between the fingers. Instead, a portion of channel 28 provides ramp faces 30 and 32 that face the bore of barrel 24 and extend at least partially into the path created by the bore. This novel design allows for easier installation of a securing member in that after a securing member is passed through the bores of the head 22 and the barrel 24, it contacts the ramps, thereby expanding the fingers. Viewing the wall anchor from the front and looking through the bore 25, as in
In the embodiment shown in
The extent of such deformation will likely depend on the thickness of the wall or other support to which it is attached. If the fingers are completely free from the wall (as shown in
The wall anchors of the present invention are preferably of unitary construction and made of a suitable resilient plastic or polymer material, such as polypropylene. ABS is the most preferred plastic material of construction. ABS is stronger, stiffer and tougher than high impact polystyrene and is also superior to it in its resistance to high temperatures and chemicals. This stronger, stiffer, tougher nature of ABS makes it desirable to improve the strength characteristics of the wall anchor. Stiffer plastics can have tendency to break when under stress, particularly in colder climates. The novel design of the present invention, however, redistributes the stresses away from the hinge areas where the fingers connect to the barrel. Thus, harder, stiffer ABS can be used without the worry that the wall anchor will break at the hinge area.
The use of harder, stiffer plastics also allows the wall anchor to be designed so as to screw itself into a wall or other support structure. Commonly, a hole is first drilled into the support structure of relatively the same or slightly smaller diameter of the barrel of the wall anchor. The wall anchor is inserted therein, and then the securing member inserted into the wall anchor to secure it to the support structure. In contrast, in one embodiment of the present invention the wall anchor can be designed with a self drilling point to cut its own hole.
Referring now to
Channel 58 separates fingers 56a and 56b much like the embodiment of the wall anchor shown in
The wall anchors of the present invention are preferably manufactured as a single piece with all the features incorporated therein. The wall anchor of the present invention can also be attached to or manufactured as a single piece with a functional unit of some sort. For instance, U.S. Pat. No. 4,735,325 discloses a support clip requiring a means for attachment to a support structure. The wall anchor of the present invention can be used as those means, and could be made in unitary construction with the support clip. Generally, functional units in need of a wall anchor of the present invention will be hooks, clips, rings, support structures such as shelving, and other apparatuses that are attached to a wall or other support structure.
While the structures of the present invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations may be applied to what has been described herein without departing from the concept and scope of the invention. All such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope and concept of the invention as it is set out in the following claims.
Patent | Priority | Assignee | Title |
10837480, | Dec 22 2016 | THE HILLMAN GROUP, INC. | Hollow wall anchor |
11619252, | Dec 01 2018 | THE HILLMAN GROUP, INC. | Wallboard anchor |
9145089, | Aug 30 2013 | Lang-Mekra North America, LLC | Socket joint with integrated tube anchors |
Patent | Priority | Assignee | Title |
2033100, | |||
2555420, | |||
3188905, | |||
3413887, | |||
3650173, | |||
4181061, | Sep 15 1976 | Mechanical Plastics Corporation | Fastening element |
4210057, | Oct 06 1976 | SPIT, SOCIETE DE PROSPECTION ET D INVENTION TECHNIQUES | Anchoring dowel with detent lugs |
4221154, | Aug 02 1978 | Mechanical Plastics Corp. | Fastening element with anti-jacking device |
4264047, | Oct 29 1979 | Illinois Tool Works Inc. | Brake and fuel line clip |
4274324, | Apr 18 1978 | Hollow wall screw anchor | |
4312614, | Nov 21 1978 | ITW Limited | Security fastener |
4361099, | Jun 27 1980 | Schulte Corporation | Shelf apparatus |
4518291, | Mar 11 1983 | Hilti Aktiengesellschaft | Plastics material expansion dowel with wave-form slots |
4548327, | Nov 07 1983 | CLAIRSON, INC | Pole assembly for installing closet shelves |
4571134, | Apr 06 1983 | ILLINOIS TOOL WORKS INC A CORPORATION OF DE | Two-piece plastic fastener and apparatus for molding same |
4624376, | Dec 15 1983 | Lee-Rowan Company | Adjustable wire shelf and bracket |
4637765, | Jul 18 1984 | Nifco Inc. | Two-piece expandable plastic rivet |
4646998, | Nov 20 1981 | CLAIRSON, INC | Wall-mounted shelf support clip |
4662595, | Oct 02 1985 | Rubbermaid Incorporated | Support brace assembly |
4669936, | Oct 02 1985 | Lee-Rowan Company | Back clip |
4693248, | Jun 20 1983 | Ethicon, Inc. | Two-piece tissue fastener with deformable retaining receiver |
4708552, | Sep 12 1984 | Clairson Corporation | Expansible mounting assembly |
4722648, | Oct 02 1985 | Rubbermaid Incorporated | Adjustable back clip |
4735325, | Jun 11 1986 | CLAIRSON, INC | Support clip |
4752170, | Sep 04 1986 | MECHANICAL PLASTICS CORP , A CORP OF NY | Fastening device with nesting anchoring elements |
4753405, | Oct 02 1985 | Lee-Rowan Company | Support brace assembly for shelf |
4757664, | Jun 04 1985 | FREISSLE, MANFRED FRANZ AXEL | Wear resistant panel arrangement |
4861206, | Nov 26 1986 | Tox-Dubel-Werk Richard M. Heckhausen GmbH & Co. KG | Straddling plug |
4878790, | Apr 02 1985 | Mechanical Plastics Corp. | Expansible fastening element |
4993901, | Feb 26 1990 | MECHANICAL PLASTICS CORP , A CORP OF NEW YORK | Over-center hollow wall anchor with enhanced holding strength |
5028186, | Jan 29 1990 | Mechanical Plastics Corp | Hollow wall anchor with enhanced holding strength |
5161296, | Jul 30 1991 | Mechanical Plastics Corp | Method of securing an anchor with extrusion plastic molding in a solid wall substrate |
5195856, | Aug 29 1991 | Titan Technology, Inc. | Deformable fastening device |
5205688, | Jan 11 1989 | Thorsman & Co Aktiebolag | Deformable plug of a wall fastener |
5224805, | Dec 09 1991 | A. Raymond & Cie | Anchoring plug |
5246323, | Oct 16 1991 | SOCIETE DE PROSPECTION ET D INVENTIONS TECHNIQUES S P I T | Pin for fixing a piece to a thin supporting wall |
5286152, | Dec 08 1992 | Illinois Tool Works Inc. | Rivet fastener with push-in releasable drive pin |
5288189, | Nov 24 1989 | Plas Plugs Limited | Fixing device for a cavity wall |
5308203, | Sep 22 1992 | TITAN TECHNOLOGIES, INC | Saw tipped anchor insert |
5312215, | Mar 10 1992 | Black & Decker Inc. | Universal plug |
5380135, | Mar 10 1992 | Black & Decker Inc. | Universal plug |
5409336, | Aug 06 1993 | FAIRBAIRN READS TRUST COMPANY LIMITED AS TRUSTEES OF THE BROOKHAVEN TRUST | Wall anchoring apparatus |
5529449, | Sep 22 1992 | Titan Technologies, Inc. | Saw tipped anchor insert |
5533851, | Sep 30 1994 | CLAIRSON, INC | Hollow wall anchor |
5536121, | Sep 22 1992 | Titan Technologies, Inc. | Anchor insert |
5540528, | Feb 15 1994 | ITW-ATECO GmbH | Rivet made of plastic material for securing a plate-like workpiece to a support assembly with an approximately plane surface |
5603593, | Aug 19 1994 | Fischerwerke, Artur Fischer GmbH & Co. KG | Expansible fixing plug of plastic material |
5605238, | Jan 26 1995 | ABLECO FINANCE LLC | Shelving system |
5704746, | Jan 30 1997 | Illinois Tool Works Inc. | Plastic fastener for threaded blind aperture |
5752792, | Sep 22 1992 | Cobra Anchors Co. Ltd. | Anchor insert |
5807050, | Aug 22 1995 | A. Raymond & Cie. | Sheet metal anchor |
5833415, | Sep 22 1992 | COBRA ANCHORS CO , LTD ; COBRA ANCHORS CO LTD | Anchor insert improvement |
5938385, | May 22 1998 | Mechanical Plastics Corp | Nested solid, solid wall anchor |
5944295, | Jan 21 1997 | Cobra Anchor Co., Ltd. | Combination wall anchor fastener and fixture |
6086035, | Aug 07 1998 | Schulte Corporation | Wall anchor for use with wire shelves |
6829871, | Dec 01 1998 | Cobra Fixations CIE LTEE-Cobra Anchors Co., Ltd. | Wedge anchor for concrete |
7143497, | Feb 05 2004 | Illinois Tool Works Inc. | Method for anchoring an elongate fastener |
20050076602, | |||
D310623, | Feb 01 1988 | Shelfco, Inc. | Bracket for closet shelf support rod |
D322555, | Oct 26 1989 | Schulte Corporation | Clip anchor for securing rod shelf to vertical wall by deformable sleeve |
48258, | |||
48259, | |||
48260, | |||
48261, | |||
48262, | |||
48263, | |||
48264, | |||
DE2847595, | |||
GB1000131, |
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