A Wall Hanger That Grips Harder When Loaded Two Hinged Plates, Curved Prongs and No Weight Rating in the Document

This application covers a wall hanger made of two hinged metal plates, each carrying curved prongs that are pushed into plasterboard by hand. It was filed by 3M Innovative Properties Company, the patent holding arm of 3M, and names Andrew T. Helgeson and Joseph A. Hoffman as inventors. It is a divisional of Australian application 2022393937. The design matches 3M’s prong in drywall hanger line rather than its adhesive strip products, and the specification, notably, states no weight rating for anything it describes.

The Problem

The background is three sentences long and to the point. Nails and screws are not always convenient and often do not give enough support in drywall or other friable wallboard, which is weak material. Alternatives that avoid conventional fasteners either damage the wall badly, still need tools, or fail to hold the weight the packaging claims.

The unstated problem behind that is the physics of hanging something from a sheet of gypsum. A nail driven straight into plasterboard is held by a thin layer of paper and crumbly core, and the load hangs off the nail at a lever arm, so the failure mode is the wall breaking rather than the fastener bending. Any hanger that avoids studs and tools has to find a way to spread the load over more wallboard without tearing it up.

What This Invention Does

Claim 1 is a wall hanger assembly with two parts. The first is a base plate carrying one or more curved prongs, each prong extending outwardly along an arc to a wall penetrating outer end, with the base of each prong coincident with one of the two opposing side edges of the plate. The second is a first insert plate, pivotally coupled to the base plate, which carries its own curved prong that likewise extends along an arc to a wall penetrating outer end.

Two things are worth noticing about that claim. The prongs grow out of the side edges of the plates rather than being welded to the back, which the specification explains by forming both plate and prongs from a single monolithic piece of metal that is then bent. And the load bearing hook, which the abstract lists as one of the three components of the invention, is not in claim 1 at all. It arrives later, in the description, as item 170. A reader who takes the abstract as a summary of what is claimed will get that wrong.

Installation needs no tools. You hold the base plate against the wall, press it with a thumb, and it rotates about its own bottom edge so that the curved prongs sweep into the plasterboard until the plate sits flush. Then you press the insert plate near its top edge and it rotates about the hinge, driving its own prongs in along a second arc. What is left is a triangular recess between the two plates and the wall.

The mechanism that makes it hold is described in Figure 6 and is the real content of the invention. A hanging weight creates a moment that tries to rotate the base plate out from the wall about its bottom edge, which would lever the base plate prongs out. Because the insert plate is hinged near the top, that same rotation pulls the insert plate the other way, putting it in tension and driving its prongs deeper into the wallboard. The harder the load pulls, the more firmly the upper prongs set. Positioning the hinge axis away from the wall surface gives the upper prongs a longer arc and therefore deeper penetration.

The dimensional detail sits in the prong geometry. Prong height is measured along the side edge and thickness across it, and their ratio is called the prong aspect ratio. The specification prefers at least 1.5 to 1, at least 2 to 1, at least 3 to 1, and typically no more than about 5 to 1. One worked embodiment gives a height of about 0.10 inches and a thickness of about 0.022 inches, an aspect ratio of 4.55 to 1; another uses about 100 mils by about 50 mils for roughly 2 to 1. Claim 17 fixes the floor at three times. The reasoning offered is that a thin prong needs less force to push in, the wallboard itself stops it buckling as it goes, and a tall thin cross section is stiff in the direction the load actually pulls, so the prong does not bend and destroy the wall before it yields. The tip distance, the offset produced by the curvature, is about 0.5 inches in one example, and the specification says, without wishing to be bound by theory, that more tip distance means more weight.

Key Features

• Two plates on a hinge. The base plate and insert plate are pivotally coupled, and claims 5 to 13 work through the hinge in detail, including hinge guides with apertures for hinge axles, and a ledge on the base plate carrying the axles.
• Prongs formed from the plate edge. Each prong’s base is coincident with a side edge of its plate, and both plate and prongs can be stamped and bent from one piece of metal, which is what makes a tool free hanger cheap to produce.
• A high prong aspect ratio. Claim 17 requires the prong base height to be at least three times its thickness, with a worked example at 4.55 to 1. The specification credits this with both an easier push and a failure mode that does not wreck the plasterboard.
• Load induced tightening. A weight on the hook tries to rotate the base plate away from the wall, which puts the hinged insert plate in tension and drives its prongs further in, so the assembly resists the pull instead of being levered out by it.
• A ledge at about 135 degrees. Claim 10 recites a ledge projecting at an obtuse angle of about 135 degrees from the front surface, which the description says reduces the dimensional mismatch between the hinge apertures and the axles and makes the installed hanger more stable.
• Resilient metal construction. Stainless steel, titanium, cobalt chromium alloy or a shape memory alloy such as nitinol are all named, the requirement being that the hanger holds its shape while an object is being mounted.

Who Is Behind It

3M Innovative Properties Company is the entity that holds patents for 3M, so the filing tells you nothing about which 3M business unit did the work. The product family does. 3M sells two relevant lines, and both are prong in drywall products installed with thumb pressure and no tools: the 3M CLAW Drywall Picture Hanger, rated at 15, 25, 45 and 65 pounds, and the 3M CLAW Drywall Hooks, rated up to 25 pounds. The hook installation instructions describe pushing the lower prongs into the wall and then pushing an upper anchor in separately, which is recognisably the two stage installation of this specification. This is not the Command adhesive strip family, which holds by pressure sensitive tape rather than by penetrating the wall, and nothing in this document mentions adhesive at all.

The load ratings above come from 3M’s product pages, not from the patent. The specification states no weight rating, no test method and no test result. It offers only relative statements: more tip distance is believed to allow more weight, additional prongs may increase weight hanging capability at the cost of more wall damage and more insertion force, and a higher aspect ratio prong enhances strength in load bearing directions. Anyone hoping for numbers of the kind the packaging carries will not find them here. What is promised is qualitative, that the hangers provide stronger support in load bearing directions than currently available solutions.

On priority, the specification is silent. There is no cross reference paragraph, no convention claim and no statement of divisional status in the body text: the only record of the relationship is the title page entry naming Australian application 2022393937 as the parent. From the published family record, rather than from this specification, that parent is the Australian entry of PCT/IB2022/061005 filed on 15 November 2022, which claims priority from United States provisional application 63/279,809 filed on 16 November 2021. That makes the priority country the United States.

Why It Matters

Hanging something heavy on plasterboard without finding a stud is one of those small domestic problems that has never been solved well. The 3M CLAW line put a real load rating on a fixing you install with your thumb, and 3M’s own product page shows it collecting consumer new product awards for picture hanging off the back of that. The patent activity around it is worth watching for anyone in the fixings business, because the claims are about the geometry of a bent piece of steel rather than about any exotic material.

The specific idea claimed here is worth understanding even if you never buy one. Most wall fixings treat the load as something to be resisted. This one routes the load through a hinge so that it works for the fastener: the moment that would pull the lower prongs out is the same moment that drives the upper prongs in. That is a cheap trick in the best sense, since it costs one hinge and no extra material, and it is why the assembly can use prongs thin enough to push in with a thumb.

The commercial reality is also visible in the fine print of the products this belongs to. 3M states that the CLAW hangers are for drywall only, do not need a stud, are not for items more than three inches from the wall, and that using two of them does not double the rating. Those constraints line up exactly with the mechanism the specification describes, which depends on the wallboard supporting the prong against buckling and on the load sitting close to the wall so the overturning moment stays small. The claim is narrower than the title suggests, but it covers the part of the design that actually does the work.

Related Concepts

• Drywall – the friable gypsum wallboard whose weakness the whole design is built around.
• Wall plug – the conventional anchor this hanger is meant to replace for light and medium loads.
• Hinge – the pivot between the two plates, which is what converts hanging load into deeper prong penetration.
• Stainless steel – the first of the resilient metals the specification nominates for the hanger body.
• Picture frame – the object this class of hanger is mainly sold to support, along with mirrors and wall art.

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AU 2026202233 was published in the Australian Official Journal of Patents on 9 April 2026 and is open for public inspection. Patent applications represent inventions that are sought to be protected and do not necessarily reflect commercially available products.