Patent US3662644A successfully refreshed from Google Patents.
US3662644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wall plug assembly, particularly for affixing facings
Assignee: Hilti AG
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Filing: 1970-06-30
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Granted: 1972-05-16
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Expires: 1990-06-30
Abstract
Abstract A wall plug assembly, particularly for affixing facings, comprising the actual ''''dowel'''' or plug itself, a securing screw, an extension shank and an expanding sleeve for the latter. The plug, in a zone not capable of being expanded, and/or in the extension shank are respectively is provided with at least one thrust bearing for the purpose of fixing the securing screw in its axial position.
Inventors
- 👤 Friedrich Flesch
- 👤 Hansjorg List
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:47
CPC Classifications
E; E04; E04F; E04F13/00; E04F13/07; E04F13/08; E04F13/0801; E04F13/0832; E04F13/0833; E04F13/0835; E04F13/0837; F; F16; F16B; F16B13/00; F16B13/12; F16B13/124
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
221 words
A wall plug assembly, particularly for affixing facings to a support, comprising an expansion plug having a forward portion provided with an elongated axial slit, and a sleeve-shaped nonspreadable rear portion having a central axial opening of predetermined dimensions; a discrete extension shank having an internal bore and two ends one of which is dimensioned to be matingly insertable into said opening a at said rear portion of said plug, and the other of which is radially expandable; means for retaining said one end of the extension shank within said opening; an expanding sleeve insertable into said other end of the extension shank; a securing screw having a leading end and being adapted to be passed through said expanding sleeve, extension shank and rear portion of the plug and to a requisite expansion depth into said forward portion thereof for expanding the same; said securing screw having engaging means on the shank thereof; and at least one thrust bearing within the internal bore of said extension shank adapted for engaging said means on said securing screw and axially retaining said securing screw and being rearwardly spaced from said forward portion of said plug by such a distance that on engagement of said securing screw by said thrust bearing said leading end is lodged in said plug only to a pre-expansion depth.
Claim 2
Dependent Claim
221 words
A wall plug assembly, particularly for affixing facings to a support, comprising an expansion plug having a forward portion provided with an elongated axial slit, and a sleeve-shaped nonspreadable rear portion having a central axial opening of predetermined dimensions; a discrete extension shank having an internal bore and two ends one of which is dimensioned to be matingly insertable into said opening a at said rear portion of said plug, and the other of which is radially expandable; means for retaining said one end of the extension shank within said opening; an expanding sleeve insertable into said other end of the extension shank; a securing screw having a leading end and being adapted to be passed through said expanding sleeve, extension shank and rear portion of the plug and to a requisite expansion depth into said forward portion thereof for expanding the same; said securing screw having engaging means on the shank thereof; and at least one thrust bearing within the internal bore of said extension shank adapted for engaging said means on said securing screw and axially retaining said securing screw and being rearwardly spaced from said forward portion of said plug by such a distance that on engagement of said securing screw by said thrust bearing said leading end is lodged in said plug only to a pre-expansion depth.
Claim 3
Dependent Claim
19 words
A wall plug assembly in accordance with claim 1, wherein said thrust bearing is formed by an internal screwthread.
Claim 4
Dependent Claim
26 words
A wall plug assembly in accordance with claim 1, wherein said thrust bearing is situated in the vicinity of said one end of said extension shank.
Claim 5
Dependent Claim
20 words
A wall plug assembly in accordance with claim 1, comprising cooperating connecting means on said extension shank and said plug.
Claim 6
Dependent Claim
61 words
A wall plug assembly in accordance with claim 1, wherein said one end of the extension shank is of reduced diameter and provided with detents to engage in the axial slit in the plug, and wherein the extension shank has a thickened wall portion which is arranged in the immediate vicinity of said one end and provided with said thrust bearing.
Claim 7
Dependent Claim
48 words
A wall plug assembly in accordance with claim 1, wherein the respective internal passages of the extension shank and the thrust bearing are so dimensioned in relation to the securing screw that said screw can be screwed into the extension shank without the exertion of any appreciable force.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |