Patent US3608491A successfully refreshed from Google Patents.
US3608491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamping plug
Assignee: Dunaplug Pty Ltd
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Filing: 1968-12-26
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Granted: 1971-09-28
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Expires: 1988-12-26
Abstract
Abstract The invention provides for a plug for use in blasting holes, the plug consisting of substantially rectangular section striplike material formed into a cone-shaped spiral member in which the convolutions overlap one another and having their larger faces diverging in the direction of the small end of the member.
Inventors
- 👤 Vernon Jan Botes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:40
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/08; F42D1/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
A tapering tubular plug member having a wide end and a small end and comprising a helically wound strip of material presenting a pair of opposed wide faces, the helically wound strip material providing overlapping convolutions of progressively smaller size and which convolutions are arranged with both the wide faces of the strip material convergent toward the wide end of the member and with smaller convolutions extending from the larger convolutions, within which they are disposed, in the direction of the small end of the member whereby, on application of a force in a substantially axial direction on the small end of the member and toward the wide end of the member, the wide faces of the helically wound strip slide and engage wedgingly on one another and cause radial expansion of the convolutions for the convolution at the wide end of the member to tightly engage onto walls of a hole in which the member is located.
Claim 2
Dependent Claim
158 words
A tapering tubular plug member having a wide end and a small end and comprising a helically wound strip of material presenting a pair of opposed wide faces, the helically wound strip material providing overlapping convolutions of progressively smaller size and which convolutions are arranged with both the wide faces of the strip material convergent toward the wide end of the member and with smaller convolutions extending from the larger convolutions, within which they are disposed, in the direction of the small end of the member whereby, on application of a force in a substantially axial direction on the small end of the member and toward the wide end of the member, the wide faces of the helically wound strip slide and engage wedgingly on one another and cause radial expansion of the convolutions for the convolution at the wide end of the member to tightly engage onto walls of a hole in which the member is located.
Claim 3
Dependent Claim
20 words
A tapering tubular plug member as claimed in claim 1 wherein the strip material is of narrow rectangular cross-sectional shape.
Claim 4
Dependent Claim
60 words
A plug member as claimed in claim 1 wherein the strip material is of tapering and substantially truncated narrow triangular cross-sectional shape, the wide and relatively sloping faces of the helically wound strip material being arranged to converge in the direction of the wide end of the member and diverge in the direction of the small end of the member.
Claim 5
Dependent Claim
27 words
A tapering tubular plug member as claimed in claim 1 wherein the strip material provides a transverse end portion disposed across the small end of the member.
Claim 6
Dependent Claim
81 words
A tapering tubular plug member as claimed in claim 1 wherein the portion of the strip material adapted to form the convolution at the wide end of the member is of progressively decreased thickness and adapted to form a substantially true cylindrical circumferential face for engaging the walls of the hole, said true cylindrical surface being surmounted by a generally conical surface of substantially helically ribbed appearance presented by exposed portions of the overlapping convolutions of the helically wound strip material.
Claim 7
Dependent Claim
54 words
A tapering tubular plug member as claimed in claim 1 wherein a substantially conical part is provided on the end of the strip at the small end of the member, said conical part being provided with an axial passage and is arranged with its small end directed toward the wide end of the member.
Claim 8
Dependent Claim
33 words
A tapering tubular plug member as claimed in claim 1 wherein an outwardly flared formation is provided on an outwardly directed edge portion of the convolution at the small end of the member.
Claim 9
Dependent Claim
44 words
A tapering tubular plug member as claimed In claim 1 wherein a formation for engagement by tool means, for extraction of the member, is provided on a portion of the inwardly directed wide face of the convolution at the wide end of the member.
Claim 10
Dependent Claim
40 words
A tapering tubular plug member as claimed in claim 1 wherein the strip material is provided at an edge portion, to be directed toward the wide end of the member, with a lip which is directed inwardly of the member.
Claim 11
Dependent Claim
38 words
A tapering tubular plug member as claimed in claim 1 wherein the strip material is provided at an edge portion, to be directed toward the small end of the member, with a lip directed outwardly of the member.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |