Patent US4980413A successfully refreshed from Google Patents.
EP0032702A1
Expired / Lapsed
EP
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Masonry plug
Assignee: Lefox Srl
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Filing: 1981-01-12
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Granted: —
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Expires: 2001-01-12
Abstract
Abstract A masonry metal-plug for anchoring fixtures to a masonry wall comprises a plurality of expandable sectors (2) held mutually associated by a single tulip type spring and effective to be expanded by inserting an expander cone (19) under the pull applied by a bolt (17) threaded therein. On respective expandable sectors (2) projecting teeth (6) are formed effective to engage with seats (7) formed in an adjacent sector (2) in such a way as to hold the expandable sectors correctly beside one another and prevent the plug from rotating within the hole whereinto it is inserted.
Inventors
- 👤 Domenico Morassutti
- 👤 Elio Martella
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 13:07
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/04; F16B13/06; F16B13/063; F16B13/066
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
103 words
A masonry plug comprising a plurality of expandable sectors forming a sleeve which open in a uniform and continuous manner, by sliding movement and insertion of an expander cone under the pull applied by a bolt threaded therein, characterized in that said sectors (2) are held mutually associated by a single elastic element (10) including centripetally acting spring portions, and that said expander cone (19) has multiple rotation-preventing and guiding means (22,23) acting on said sectors (2), means (6,7) being also provided for holding said sectors correctly beside one another and preventing the plug from rotating within the hole whereinto it is inserted.
Claim 2
Dependent Claim
103 words
A masonry plug comprising a plurality of expandable sectors forming a sleeve which open in a uniform and continuous manner, by sliding movement and insertion of an expander cone under the pull applied by a bolt threaded therein, characterized in that said sectors (2) are held mutually associated by a single elastic element (10) including centripetally acting spring portions, and that said expander cone (19) has multiple rotation-preventing and guiding means (22,23) acting on said sectors (2), means (6,7) being also provided for holding said sectors correctly beside one another and preventing the plug from rotating within the hole whereinto it is inserted.
Claim 3
Dependent Claim
90 words
A masonry plug according to Claim 1, characterized in that said elastic element is a tulip type spring (10) made as a single piece by die-cutting it from sheet steel and successively bending over to enclose an ideal cylinder having the dimensions of said sleeve (1), and has means (11) adapted for surrounding said expandable sectors (2), means (15) of engagement with said sectors (2), elastic means (14) acting on said sectors (2) to hold them side-by-side, and means adapted for maintaining said tulip spring (10) in the desired shape.
Claim 4
Dependent Claim
42 words
A masonry plug according to one or more of the preceding claims, characterized in that said means of the tulip spring (10) adapted for surrounding said expandable sectors (2) substantially comprise a strip (11) of sufficient width forming a cylindrical containment seat.
Claim 5
Dependent Claim
76 words
A masonry plug according to one or more of the preceding claims, characterized in that said means (15) of the tulip spring (10) adapted for engaging said sectors (2) substantially comprise tabs (15) formed by die-cutting to a "C" the sheet metal which forms the tulip spring (10) at the area of the strip (11), said tabs (15) being bend inwardly and inserted into a groove (9) provided at the corresponding area of the sectors (2).
Claim 6
Dependent Claim
29 words
A masonry plug according to one or more of the preceding claims, characterized in that said engagement tabs (15) are provided as at least one per each sector (2).
Claim 7
Dependent Claim
67 words
A masonry plug according to one or more of the preceding claims, characterized in that said means of the tulip spring (10) adapted for holding said sectors (2) elastically side-by-side substantially comprise long arcuate lugs (14) extending from said strip (11), one per sector, being inserted with their free ends into longitudinal seats (8) provided at the middle area of the outer surface of each sector (2).
Claim 8
Dependent Claim
80 words
A masonry plug according to one ore more of the preceding claims, characterized in that the two elements of said strip (11) which arrange themselves side-by-side during the bending to a cylinder, have respectively a lug (12) shaped as a rectangular tooth and a seat (13) for said lug (12), for the purpose of maintaining constant even under a strain load the cylindrical shape of said strip (11) which may only change, if any, its diameter during the assembling stage.
Claim 9
Dependent Claim
47 words
A masonry plug according to the preceding claims, characterized in that at the area where said sectors (2) are contained in the cylindrical strip (11) of said tulip spring (10), they are tapered laterally such that when they diverge mutually away they cannot interfere with one another.
Claim 10
Dependent Claim
65 words
A masonry plug according to one or more of the preceding claims, characterized in that said arcuate lugs (14), have an overall size which exceeds the cross-section of the plug and interfere with the walls of the hole after the plug has been inserted, and constitute a first engagement effective to prevent the plug from rotating while the bolt (17) is turned to tighten it.
Claim 11
Dependent Claim
39 words
A masonry plug according to Claim 1, characterized in that said means adapted for holding said sectors (2) correctly side-by-side substantially comprise teeth (6) and corresponding seats (7) provided on the two side-by-side edges of two adjacent sectors (2).
Claim 12
Dependent Claim
46 words
A masonry plug according to one or more of the preceding claims, characterized in that the outer surface of said sectors (2) has raised portions (3) and recessed portions (7) adapted for facilitating the engagement of the plug with the inner wall of the insertion hole.
Claim 13
Dependent Claim
59 words
A masonry plug according to one or more of the preceding claims, characterized in that said expander cone (19) -- substantially a truncated cone drilled and threaded axially -- has a plurality of rounded ribs (22) arranged along generatrices of the ideal conical surface, said ribs (22) being located at the lines of siding of said expandable sectors (2).
Claim 14
Dependent Claim
93 words
A masonry plug according to one or more of the preceding claims, characterized in that said expander cone (19), with the plug fully closed, is partially inserted into the hole determined by the arrangement of said sectors (2) side-by-side, it having prongs (23) -- preferably one per sector (2) -which are inserted in channels (24) provided at the middle area of the inner surface of said expandable sectors (2), the translatory movement of the expander cone (19) during the threading in of the bolt (17) being thus allowed and the rotation thereof disallowed.
Claim 15
Dependent Claim
63 words
A masonry plug according to one or more of the preceding claims, characterized in that said channels (24) only span a certain inside region of said sectors (2), thereby the expander cone (19) remains in all cases hooked up even in the event that the bolt (17) is removed or the bolt (17) urges the cone (19) toward the outside of the plug.
Claim 16
Dependent Claim
44 words
A masonry plug according to one or more of the preceding claims, characterized in that at the contact areas between the expander cone (19) and expandable sectors (2), there are provided rounded bevels (25) adapted to match the conical surface and reduce the friction.
Claim 17
Dependent Claim
56 words
A masonry plug according to one or more of the preceding claims, characterized in that said expander cone (19) has an opening angle and length calculated such that it acts while it is still partially on the outside of said expandable sectors (2) such as to constitute resting shoulders therefor at the area of maximum effort.
References Cited (Backward Citations)
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