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US3898907A
Expired / Lapsed
US
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Expansion anchor
Assignee: Individual
•
Filing: 1973-04-13
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Granted: 1975-08-12
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Expires: 1993-04-13
Abstract
Abstract An expansion sleeve for insertion into a hole of a support structure is configurated as a helical wire spring whose adjacent convolutions abut one another. In a portion of the spring which extends from the trailing towards the leading end thereof, the abutting convolutions are connected with one another by soldering, bonding, welding, or the like, so as to be immovable relative to one another. An expander element is located at the leading end and an actuator screw extends from the trailing end through the spring to the leading end where it engages the expander element so as to draw the same into the screw towards the trailing end.
Inventors
- 👤 Artur Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:15
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/04; F16B13/06; F16B13/063; F16B13/066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
270 words
An expansion anchor, particularly for use in a concrete support structure having an exposed surface and provided with a hole having an open end in the region of the exposed surface and extending beyond the same and into the support structure, comprising a partly expandable tubular element consisting of a helical wire spring having adjacent convolutions, and extending from one end of said partly expandable element to the other end thereof, said helical wire spring having a leading end portion and a trailing end portion and being adapted to be inserted into the hole of the support structure so that said leading end portion is remote from, and said trailing end portion is closer to, the open end of the hole; means for permanently interconnecting only the convolutions of said trailing end portion so as to prevent these convolutions from conducting any movement with respect to one another radially and circumferentially of said spring; an expander element adapted to be inserted into said leading end portion; and an actuating element for drawing said expander element into said leading end portion and in direction toward said trailing end portion, whereby said expander element exerts expansion forces on all convolutions of said spring so that the convolutions of said leading end portion expand and anchor said leading end portion in the hole, while the convolutions of said trailing end portion are prevented from expanding by said interconnecting means so that the support structure in the region of the hole adjacent the open end of the latter is unaffected by the expansion whereby damage to said support structure in said region is avoided.
Claim 2
Dependent Claim
270 words
An expansion anchor, particularly for use in a concrete support structure having an exposed surface and provided with a hole having an open end in the region of the exposed surface and extending beyond the same and into the support structure, comprising a partly expandable tubular element consisting of a helical wire spring having adjacent convolutions, and extending from one end of said partly expandable element to the other end thereof, said helical wire spring having a leading end portion and a trailing end portion and being adapted to be inserted into the hole of the support structure so that said leading end portion is remote from, and said trailing end portion is closer to, the open end of the hole; means for permanently interconnecting only the convolutions of said trailing end portion so as to prevent these convolutions from conducting any movement with respect to one another radially and circumferentially of said spring; an expander element adapted to be inserted into said leading end portion; and an actuating element for drawing said expander element into said leading end portion and in direction toward said trailing end portion, whereby said expander element exerts expansion forces on all convolutions of said spring so that the convolutions of said leading end portion expand and anchor said leading end portion in the hole, while the convolutions of said trailing end portion are prevented from expanding by said interconnecting means so that the support structure in the region of the hole adjacent the open end of the latter is unaffected by the expansion whereby damage to said support structure in said region is avoided.
Claim 3
Dependent Claim
14 words
An expansion anchor as defined in claim 1, wherein said interconnecting means includes solder.
Claim 4
Dependent Claim
14 words
An expansion anchor as defined in claim 1, wherein said interconnecting means includes adhesive.
Claim 5
Dependent Claim
15 words
An expansion anchor as defined in claim 1, wherein said interconnecting means includes welded joints.
Claim 6
Dependent Claim
35 words
An expansion anchor as defined in claim 1, said interconnecting means comprising a metallic strip located within said spring and extending longitudinally thereof, said strip being welded to said convolutions of said trailing end portion.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |