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Publication numberUS3613497 A
Publication typeGrant
Publication dateOct 19, 1971
Filing dateApr 10, 1969
Priority dateApr 10, 1969
Also published asCA924550A, CA924550A1, DE2017263A1
Publication numberUS 3613497 A, US 3613497A, US-A-3613497, US3613497 A, US3613497A
InventorsHeldermann James F
Original AssigneeU S Expansion Bolt Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Expansion anchor
US 3613497 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent in] 3,613,497

[72] Inventor James F. Heldermann [56] Refer n e Cited 2 A l N UNITED STATES PATENTS 1969 2,259,269 10/1941 Ruth 85/88 Patented 0ct'19197l 3,434,521 3/1969 Flora 85/83 a [73] Assignee U.S. Expansion Bolt Company FOREIGN PATENTS York, Pa. 455,280 10/1936 Great Britain 85/83 s 589,648 6/1947 Great Britain.... 85/84 281,695 7/1952 Switzerland 85/83 Primary Examiner-Edward C. Allen Anorney-Stoll and Stoll [54] EXPANSION ANCHOR 1 Claim, 10 Drawing Figs.-

ABSTRACT: An expansion anchor for wood screws and the [52] US. Cl... 85/84 like having a plurality of spaced longitudinal slots and a plu- [51] Int. Cl F16b 13/06 rality of longitudinal ribs disposed asymmetrically between the Field of Search /83, 84, slots. The slots extend alternately to the head and to the tip of 85, 86, 87, 88 the anchor.

.., EXPANSION ANCHOR BACKGROUND OF THE INVENTION 1. Field of the Invention Expansion anchors.

2. Description of the Prior Art The prior art abounds with expansion anchors which are intended to provide equal radial expansion of the anchor and accordingly provide cross-sectional construction which is symmetrical.

SUMMARY OF THE INVENTION The present invention uniquely provides not only an unsymmetrical construction for unequal expansion but provides also a preliminary collapse before expansion.

The present invention provides remarkably superior holding power in both solid and hollow wall fastenings, without danger of breakage of the fastener in hollow wall use.

Briefly, and not by way of limitation, the present invention provides a plurality of longitudinal slots extending alternately through the tip and short of the tip of the anchor. A plurality of outwardly extending longitudinal ribs are asymmetrically disposed annularly of the anchor upon insertion into a wall hole. The collapsed portions provide a plurality of inwardly directed splines in the bore of the anchor for improved engagement by the screw threads of the anchor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a side view of an expansion anchor constructed in accordance with the invention and showing alternately extending slots.

FIG. 2 is a side view of the anchor of FIG. 1 shown rotated about its longitudinal axis and centered upon a downwardly extending slot.

FIG. 3 is a top view of the anchor of FIG. 2 showing in phantom the outwardly extending longitudinal ribs.

FIG. 4 is a cross-sectional view taken across line 4-4 of FIG. 3 and showing alternate slots.

FIG. 5 is a cross-sectional view taken across line 55 of FIG. 1 and showing the bore configuration.

FIG. 6 is a' cross-sectional view taken across line 6-6 of FIG. 4 and showing alternating slots and asymmetric outer ribs.

FIG. 7 is a view similar to that of FIG. 6 but showing the anchor asymmetrically collapsed after insertion into a wall hole and prior to insertion of a screw.

FIG. 8 is a view, partly in cross section, of an anchor constructed in accordance with the invention and showing a screw inserted therein and expanding the anchor against the wall of a full length hole.

FIG. 9 is a cross-sectional view taken across line 9-9 of FIG. 8.

FIG. 10 is a view of an anchor constructed in accordance with the invention shown expanded in a hollow wall.

DESCRIPTION OF PREFERRED EMBODIMENT OF THE INVENTION Referring to the drawing, expansion anchor 10 has a head 12 and a body portion 14 with tip 16 at the end of body portion 14 opposite head 12. A plurality of slots in and longitudinally of body portion 14 alternate between downwardly extending slots 18 which extend down toward tip 16 and upwardly extending slots 20 which extend up toward head 12. As may be seen in FIG. 10, the result is a plurality of legs 22 separated by downwardly extending slots 18. Each leg 22 has an upwardly extending slot 20.

A plurality of ribs 24 extend on the outside of body portion I4 longitudinally thereof, each leg 22 being provided with at least one such rib 24 asymmetrically located; that is, located closer to one side edge than the other. Thus, as shown in FIGS. 6 and 7, each upwardly extending slot 20 is centered between two downwardly extending slots 18 and rib 24 is located on one side of and substantially parallel to upwardly extending slot 20. Rib 24 tapers form head 12 down toward tip 16 for ease of insertion into a hole, although it should be noted that such taper is not an essential feature of the invention.

Expansion anchor 10 is provided with a longitudinal bore 26 which tapers from its entrance at head 12 downtoward tip I6. A wood screw 28 or some other similar screw expands anchor 10 when inserted into bore 26.

Expansion anchor 10 is used by inserting it into a hole in a wall and securing a member by means of screws 28, the anchor expanding against the side of the hole. If the hole is of substantially the same diameter as the outside diameter without ribs 24 of body portion 14 the unique advantage of the present invention will be utilized most advantageously. The

outside diameter of body portion 14 including ribs 24 being larger than the diameter of the hole in the wall, body portion 14 will be compressed radially inwardly at each rib 24 or forced insertion of the anchor into the hole. Because of the asymmetrical location of ribs 24 as above described, collapse of the anchor will be similarly asymmetric and will result in the inward twisting of each leg 22 as may clearly be seen in FIG. 7.

Corresponding to each rib 24 there will be formed inwardly and longitudinally of bore 26 a spline 30 which is an inner edge of each leg 22. A screw entering bore 26 will first engage its threads with splines 30 for quicker, surer, and otherwise improved holding power. The initial bite provided by splines 30 for the threads of the screw is not to be found in any known prior device of the kind.

While the foregoing is illustrative of a preferred embodiment of the invention, it is clear that other embodiments and modifications may be provided. For example, while six slots and three outer rigs are shown in the drawing any number of slots and ribs satisfying the foregoing description may be employed. Also, upwardly extending slots need not more than approach the anchor head, and downwardly extending slots need not more than approach the anchor tip.

The expansion anchor may be made of nylon or any other suitable material.

A still further advantage of the present invention is that breakage of the anchor, as may occur from the insertion of an expansor of oversize diameter, it restricted to the head portion. Such a rupture, which would be at an upwardly extending slot in the head portion, does not affect holding power of the anchor.

Although an enlarged head is shown in the drawing it is obvious that the head end portion may not be anything more than the entrance of the anchor.

What is claimed is:

I. An expansion anchor comprising:

a. a hollow body portion and an expansor adapted to enter and expand said body portion;

b. said body portion having a head at one end and a plurality of legs arranged in pairs and extending longitudinally from said head toward the opposite end of said body portion;

c. the legs constituting each pair of legs being integrally connected to the head and to each other at their respective upper ends adjacent the head and being further integrally connected to each other at their respective lower ends, and being free from each other intermediate said upper and lower ends;

. each pair of legs being also free from the other pairs of legs throughout their entire length except at their upper ends where they are integrally connected to the head; and

c. all of said legs being relatively flexible and free to bow inwardly intermediate their respective ends upon insertion into a bore and being free to bow outwardly intermediate their respective ends upon insertion of the expansor.

f. the expansor being a screw-threaded member having a head with a screwdriver-engaging formation;

g. a longitudinally extending rib being formed on the outer surface of one leg of each pair of legs;

h. the ribbed legs alternating with the unribbed legs;

i. the ribbed legs being caused to bow inwardly to a greater tending splines on alternate legs of the body portion extent than the unribbed legs when the body portion is inwhich are readily engageable by the threads of the expann serted into a bore; and sor. j. thereby forming inwardly projecting, longitudinally ex-

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2259269 *May 14, 1940Oct 14, 1941Ruth John LUniversal nut
US3434521 *Aug 2, 1965Mar 25, 1969Tinnerman Products IncPlastic fastener with curved entry shoulder in bore
CH281695A * Title not available
GB455280A * Title not available
GB589648A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3779495 *Aug 5, 1971Dec 18, 1973Richards AWall anchor for electrical conduits
US3916480 *Aug 28, 1974Nov 4, 1975Lester L SmithFace mounted hinge
US4322194 *Sep 12, 1979Mar 30, 1982Coats & Clark, Inc.Wall anchor with self-drilling capability
US4367995 *Jul 2, 1980Jan 11, 1983Nifco Inc.Quick-acting expansible fastener
US4478545 *Sep 14, 1982Oct 23, 1984Nifco Inc.Fastening device for panels or the like
US5800109 *May 13, 1997Sep 1, 1998Amifast CorporationFastener with a tapered section and a slot
US6990982Mar 12, 2003Jan 31, 2006Bonutti Ip, LlcMethod for harvesting and processing cells from tissue fragments
US7134437Mar 22, 2002Nov 14, 2006Bonutti Ip, LlcMethod for utilizing human tissue
US7462200Nov 23, 2005Dec 9, 2008Marctec, LlcMethod for tissue grafting
US7517182 *Apr 12, 2004Apr 14, 2009Itw Construction Products Italy S.R.IScrew anchor
US7575379Jun 22, 2006Aug 18, 2009Applied Optical Systems, Inc.Body having staking pin and method of making
US7666178Jun 30, 2004Feb 23, 2010Kimberly-Clark Worldwide, Inc.Retention device for medical components
US7727283Mar 4, 2004Jun 1, 2010P Tech, Llc.Tissue stabilizing implant method
US7896880Nov 15, 2001Mar 1, 2011P Tech, LlcApparatus and method for tissue removal
US8747439Jul 10, 2006Jun 10, 2014P Tech, LlcMethod of using ultrasonic vibration to secure body tissue with fastening element
US8808329Apr 3, 2012Aug 19, 2014Bonutti Skeletal Innovations LlcApparatus and method for securing a portion of a body
US8814902Jul 31, 2006Aug 26, 2014Bonutti Skeletal Innovations LlcMethod of securing body tissue
US8845687Sep 17, 2013Sep 30, 2014Bonutti Skeletal Innovations LlcAnchor for securing a suture
US8845699Mar 6, 2012Sep 30, 2014Bonutti Skeletal Innovations LlcMethod of securing tissue
US20020029055 *Jun 1, 2001Mar 7, 2002Bonutti Peter M.Apparatus and method for tissue removal
US20020040246 *Nov 21, 2001Apr 4, 2002Bonutti Peter M.Tissue press and system
US20020055755 *Nov 15, 2001May 9, 2002Bonutti Peter M.Apparatus and method for tissue removal
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US20040202522 *Apr 12, 2004Oct 14, 2004Federico CabreleScrew anchor
US20050158139 *Feb 8, 2005Jul 21, 2005Hepworth Paul S.Fixing plug
US20060004345 *Jun 30, 2004Jan 5, 2006Mcmichael Donald JRetention device for medical components
US20070297725 *Jun 22, 2006Dec 27, 2007Applied Optical Systems, IncBody having staking pin and method of making
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WO2008005203A2 *Jun 22, 2007Jan 10, 2008Applied Optical Systems, Inc.Body having staking pin and method of making
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U.S. Classification411/80.2
International ClassificationF16B13/12, F16B13/00
Cooperative ClassificationF16B13/124
European ClassificationF16B13/12B
Legal Events
Mar 30, 1988AS06Security interest
Effective date: 19880321
Owner name: U.S.E. DIAMOND, INC.
Mar 30, 1988ASAssignment
Effective date: 19880321
Jun 11, 1982ASAssignment
Owner name: U.S.E. DIAMOND, INC.
Effective date: 19801215
Jun 11, 1982AS01Change of name
Owner name: U.S. EXPANSION BOLT C.
Effective date: 19801215
Owner name: U.S.E. DIAMOND, INC.