US4290338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Straddle cartridge for a straddle cartridge anchor
Assignee: GD-ANKER GEBIRDS-DUBEL-ANKER & Co A COR OF AUSTRIA GmbH
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Filing: 1979-07-17
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Granted: 1981-09-22
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Expires: 1999-07-17
Abstract
Abstract The subject invention relates to a straddle cartridge for a straddle cartridge anchor having a central bore which is adjusted to the conicity of the anchor head and wherein the cartridge parts are held together by means of straddle members arranged in succession parallel with respect to the cartridge axis and in direction of the thick ends of the cartridge parts extending outwardly from the outer walls of the cartridge parts.
Inventors
- 👤 Rudolf Gruber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:54
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/008; E21D21/0093; F; F16; F16B; F16B13/00; F16B13/04; F16B13/06; F16B13/063; F16B13/066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A rock bolt expansion anchor for anchoring a tapered head of a rock bolt in a bore, said anchor comprising a generally cylindrical expandable cartridge adapted to fit into said bore and formed with an internal taper complementary to that of said head whereby said cartridge is spread outwardly against the wall of said bore by a force applied to said bolt, and a plurality of straddle members mounted on said cartridge, each of said straddle members comprising a row of outwardly projecting fingers unitarily connected together, said straddle members being of a material having a greater flexibility than that of said cartridge.
Claim 2
Dependent Claim
103 words
A rock bolt expansion anchor for anchoring a tapered head of a rock bolt in a bore, said anchor comprising a generally cylindrical expandable cartridge adapted to fit into said bore and formed with an internal taper complementary to that of said head whereby said cartridge is spread outwardly against the wall of said bore by a force applied to said bolt, and a plurality of straddle members mounted on said cartridge, each of said straddle members comprising a row of outwardly projecting fingers unitarily connected together, said straddle members being of a material having a greater flexibility than that of said cartridge.
Claim 3
Dependent Claim
62 words
The expansion anchor defined in claim 1 wherein said cartridge is formed with a plurality of axially extending slots, each of said straddle members being received in respective one of said slots and comprising a bar connected to the fingers of the respective row and received in the respective slot, and means for retaining each of said bars in the respective slot.
Claim 4
Dependent Claim
41 words
The expansion anchor defined in claim 2 wherein said cartridge comprises at least two cylindrical segmental members and a ring for temporarily holding said members together, said ring being detachable from said cartridge upon insertion of said cartridge into said bore.
Claim 5
Dependent Claim
30 words
The expansion anchor defined in claim 1, claim 2 or claim 3 wherein said straddle members and said cartridge are composed, respectively, of flexible plastic material and rigid plastic material.
Claim 6
Dependent Claim
29 words
The expansion anchor defined in claim 1, claim 2 or claim 3 wherein said straddle members are composed of flexible plastic material and said cartridge is composed of metal.
References Cited (Backward Citations)
FR1264060A
Cited
US3319209A
Cited
GB1270522A
Cited
DE2100379A1
Cited
CA953546A
Cited
DE2614565A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |