Patent US4523880A successfully refreshed from Google Patents.
US4523880A
Expired / Lapsed
US
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Tie rod assembly for rock borehole anchor
Assignee: H Weidmann AG
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Filing: 1983-05-04
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Granted: 1985-06-18
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Expires: 2003-05-04
Abstract
Abstract A tie rod assembly for a rock borehole anchor includes a tension rod 3 having a plurality of wedge shaped spreading bolts 10 at its lower end surrounded by spreading sleeve 20 segments 21, and a sleeve 40 on its upper end threaded to a tension nut 60 which bears against a ground support or anchor plate 70 upon installation and tightening. The sleeve 40 mates with the tension rod via saw tooth configured circumferential ridges or fins 45, 46 having increasing inclination angles, to thereby provide for a constant force transmission per unit of tooth length. The tension nut and anchor plate have complementarily configured spherical bearing surfaces 65, 77, and the ground engaging lower area of the anchor plate has fracturable webs 75 to accommodate surface irregularities and projections.
Inventors
- 👤 Erwin Isler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:49
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/008; E21D21/0006; E21D21/0086; E21D21/0093
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
224 words
A tie rod for a rock securing system having a tension element anchored in a borehole by a molded anchoring element which rests against the wall of the borehole and holds the tension element, the tension element being connected with the anchoring element in a pressure-locked mannner in the rock by frictional force, and the free end of the tension element being threaded to a tension nut supported by an anchor plate resting against the surface of the rock, characterized by: the anchoring element (1) comprising a plurality of axially spaced spreading bolts (10) each solidly connected with the tension element (3) and each having a plurality of wedge surfaces (15) surrounding the tension element, and a plurality of spreading sleeves (29) individually associated with and surrounding the bolts and connected with each other, a threaded sleeve (40) coupled to a free end (42) of the tension element, the outer surface of the tension element and the inner surface of the threaded sleeve each having a plurality of mating elevations (95, 96, 97), said elevations having a saw-tooth sectional configuration with equal height flanks (45) of increasing length from the free end, and the tension nut (60) and anchor plate (70) each having an arched surface of the same shape (65, 77) in the area where the tension nut bears against the anchor plate.
Claim 2
Dependent Claim
224 words
A tie rod for a rock securing system having a tension element anchored in a borehole by a molded anchoring element which rests against the wall of the borehole and holds the tension element, the tension element being connected with the anchoring element in a pressure-locked mannner in the rock by frictional force, and the free end of the tension element being threaded to a tension nut supported by an anchor plate resting against the surface of the rock, characterized by: the anchoring element (1) comprising a plurality of axially spaced spreading bolts (10) each solidly connected with the tension element (3) and each having a plurality of wedge surfaces (15) surrounding the tension element, and a plurality of spreading sleeves (29) individually associated with and surrounding the bolts and connected with each other, a threaded sleeve (40) coupled to a free end (42) of the tension element, the outer surface of the tension element and the inner surface of the threaded sleeve each having a plurality of mating elevations (95, 96, 97), said elevations having a saw-tooth sectional configuration with equal height flanks (45) of increasing length from the free end, and the tension nut (60) and anchor plate (70) each having an arched surface of the same shape (65, 77) in the area where the tension nut bears against the anchor plate.
Claim 3
Dependent Claim
31 words
Tie rod according to claim 1, wherein the bolts and the tension element are connected with each other in a pressure-locked manner by radial fins (11, 11a) engaging with each other.
Claim 4
Dependent Claim
26 words
Tie rod according to claim 2, wherein the fins have a saw tooth shape with inclined flanks (13) inclined in a direction opposite the free end.
Claim 5
Dependent Claim
16 words
Tie rod according to claim 1, wherein each bolt has a double truncated cone sectional shape.
Claim 6
Dependent Claim
58 words
Tie rod according to claim 1, wherein each spreading sleeve (20) comprises a plurality of connected segments (21) having inside surfaces mating with and complementary to the wedge surfaces (15) and roughened outside surfaces, each segment having a T-shaped section from which a crossbar (22) becomes increasingly thicker from an outer edge towards a rhombic carrying web (23).
Claim 7
Dependent Claim
26 words
Tie rod according to claim 5, wherein axial connecting portions (26) are provided between adjacent spreading sleeves, and each sleeve has outwardly projecting centering tongues (27).
Claim 8
Dependent Claim
59 words
Tie rod according to claim 1, wherein the tension nut (60) comprises a cylindrical sleeve (61) provided with radial fins (63, 66) and a support flange (64) at its lower end (67) whose outer surface (65) is convex, and wherein the thread (62) of the tension nut and the corresponding thread (41) of the threaded sleeve are buttress threads.
Claim 9
Dependent Claim
23 words
Tie rod according to claim 7, wherein the support flange is annular and is joined to a hook (68) surrounding the cylindrical sleeve.
Claim 10
Dependent Claim
27 words
Tie rod according to claim 1, wherein the anchor plate (70) is annular and has surrounding outer and inner fins (71, 72) bridged by segment plates (75).
Claim 11
Dependent Claim
13 words
Tie rod according to claim 9, wherein the segment plates are radially arranged.
Claim 12
Dependent Claim
29 words
Tie rod according to claim 10, wherein a bearing surface (77) of the anchor plate for the outer surface (65) of the tension nut support flange (64) is concave.
Claim 13
Dependent Claim
19 words
Tie rod according to claim 11, wherein the shapes of the bearing surface and the outer surface are spherical.
Claim 14
Dependent Claim
134 words
A tie rod for a rock securing system having a tension element anchored in a borehole by a molded anchoring element which rests against the wall of the borehole and holds the tension element, the tension element being connected with the anchoring element in a pressure-locked manner in the rock by frictional force, and the free end of the tension element being threaded to a tension nut supported by an anchor plate resting against the surface of the rock, characterized by: the anchoring element (1) comprising a plurality of axially spaced spreading bolts (10) each solidly connected with the tension element (3) and each having a plurality of wedge surfaces (15) surrounding the tension element, and a plurality of spreading sleeves (20) individually associated with and surrounding the bolts and connected with each other.
Claim 15
Dependent Claim
134 words
A tie rod for a rock securing system having a tension element anchored in a borehole by a molded anchoring element which rests against the wall of the borehole and holds the tension element, the tension element being connected with the anchoring element in a pressure-locked manner in the rock by frictional force, and the free end of the tension element being threaded to a tension nut supported by an anchor plate resting against the surface of the rock, characterized by: the anchoring element (1) comprising a plurality of axially spaced spreading bolts (10) each solidly connected with the tension element (3) and each having a plurality of wedge surfaces (15) surrounding the tension element, and a plurality of spreading sleeves (20) individually associated with and surrounding the bolts and connected with each other.
Claim 16
Dependent Claim
21 words
Tie rod according to claim 13, wherein the plurality of wedge surfaces (15) surrounding the tension element further comprise cylindrical surfaces.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |