US3673644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tendon anchorage
Assignee: HOWLETT MACHINE WORKS
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Filing: 1970-07-10
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Granted: 1972-07-04
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Expires: 1990-07-10
Abstract
Abstract A tendon anchorage, primarily for use in pre-tensioning and post-tensioning concrete, in which the anchorage includes an axially convergent bore and a tendon gripping wedge assembly disposed in the bore. The wedge assembly preferably includes two wedges in which interiorly located gripping portions for engaging the tendons are formed. The gripping portions may be aligned along opposed internal faces of the wedges. One or more slots or grooves, which may be angularly skewed to the longitudinal axis of the wedge assembly, extend from the gripping portions toward or through to the peripheral wall of the wedges over a portion of the axial length to provide relatively movably wedge segments adjacent the gripping portions which afford the desired wedge assembly flexure and the addition of gripping forces.
Inventors
- 👤 George H Howlett
- 👤 James W Howlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:56
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/08; E04C5/12; E04C5/122; F; F16; F16B; F16B2200/00; F16B2200/10; F16B2200/30; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T24/3909; Y10T403/00; Y10T403/70; Y10T403/7047; Y10T403/7061
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
290 words
In a tendon anchorage including, an anchor member with an interior wall defining a convergently tapered bore over a length thereof, the smallest transversed dimension of said bore being sufficient to receive a plurality of tendons to be tensioned; and a wedge assembly mounted in said bore in sliding engagement with said interior wall, said assembly including at least two wedges each having peripheral walls formed for advancement of said wedges in said bore in the direction of convergence of said bore, said wedges each being formed with side faces extending internally from said peripheral walls, said wedges being mounted in said bore with said side faces in juxtaposed relation, said side faces being further formed with a plurality of recessed tendon gripping portions positioned in said side faces with the longitudinal axes thereof falling generally on a plane parallel to said side faces, each of said wedges further being formed with at least one axially extending groove with at least a portion of said groove extending from each of said plurality of gripping portions laterally toward said peripheral wall in a direction generally transversed to said side face and said plane to define with said side face a pair of wedge segments on opposed sides of part of the axial length of said gripping portions and at least one of said pair of segments being formed for relative displacement toward the other segment in a direction generally parallel to said side face and plane over a portion of the axial length of said wedge upon urging of said assembly in the direction of convergence of said bore, the improvement comprising: at least one of the grooves in said wedges being skewed to the longitudinal axis of said wedge assembly.
Claim 2
Dependent Claim
290 words
In a tendon anchorage including, an anchor member with an interior wall defining a convergently tapered bore over a length thereof, the smallest transversed dimension of said bore being sufficient to receive a plurality of tendons to be tensioned; and a wedge assembly mounted in said bore in sliding engagement with said interior wall, said assembly including at least two wedges each having peripheral walls formed for advancement of said wedges in said bore in the direction of convergence of said bore, said wedges each being formed with side faces extending internally from said peripheral walls, said wedges being mounted in said bore with said side faces in juxtaposed relation, said side faces being further formed with a plurality of recessed tendon gripping portions positioned in said side faces with the longitudinal axes thereof falling generally on a plane parallel to said side faces, each of said wedges further being formed with at least one axially extending groove with at least a portion of said groove extending from each of said plurality of gripping portions laterally toward said peripheral wall in a direction generally transversed to said side face and said plane to define with said side face a pair of wedge segments on opposed sides of part of the axial length of said gripping portions and at least one of said pair of segments being formed for relative displacement toward the other segment in a direction generally parallel to said side face and plane over a portion of the axial length of said wedge upon urging of said assembly in the direction of convergence of said bore, the improvement comprising: at least one of the grooves in said wedges being skewed to the longitudinal axis of said wedge assembly.
Claim 3
Dependent Claim
37 words
The tendon anchorage as defined in claim 1 wherein, said skewed grooves extend from one gripping portion adjacent a first end of said assembly to a second gripping portion adjacent a second end of said wedge assembly.
Claim 4
Dependent Claim
53 words
A tendon anchorage as defined in claim 2 wherein, said grooves are formed as slots extending from said gripping portions to said peripheral wall and said grooves terminate short of said side faces between said gripping portions whereby said segments are joined to a common portion of said wedge between said gripping portions.
Claim 5
Dependent Claim
282 words
A tendon anchorage comprising: a. an anchor member with an interior wall defining a convergently tapered bore; and b. a wedge assembly mounted in said bore in sliding engagement with said interior wall, said assembly including at least two wedges each having peripheral walls formed for advancement of said wedges in said bore, said wedges each being formed with side faces extending internally from said peripheral walls, said wedges being mounted in said bore with said side faces in juxtaposed relation, each said side face being further formed with a plurality of recessed tendon gripping portions, each of said wedges further being formed with at least two grooves extending parallel to the longitudinal axis of said assembly with at lease a portion of each of said grooves extending from each of said plurality of gripping portions laterally toward said peripheral wall in a direction generally transversed to said side face, one of said grooves in a first gripping portion extending from a first end of said Assembly toward and terminating short of a second end of said assembly, and another of said grooves in a second gripping portion extending from said second end of said assembly toward and terminating short of said first end of said assembly, said grooves defining with said side face a pair of wedge segments on opposed sides of part of the axial length of said gripping portions, and at least one of said pair of segments being formed for relative displacement toward the other segment in a direction generally parallel to said side face over a portion of the axial length of said wedges upon urging of said assembly in the direction of convergence of said bore.
Claim 6
Dependent Claim
282 words
A tendon anchorage comprising: a. an anchor member with an interior wall defining a convergently tapered bore; and b. a wedge assembly mounted in said bore in sliding engagement with said interior wall, said assembly including at least two wedges each having peripheral walls formed for advancement of said wedges in said bore, said wedges each being formed with side faces extending internally from said peripheral walls, said wedges being mounted in said bore with said side faces in juxtaposed relation, each said side face being further formed with a plurality of recessed tendon gripping portions, each of said wedges further being formed with at least two grooves extending parallel to the longitudinal axis of said assembly with at lease a portion of each of said grooves extending from each of said plurality of gripping portions laterally toward said peripheral wall in a direction generally transversed to said side face, one of said grooves in a first gripping portion extending from a first end of said Assembly toward and terminating short of a second end of said assembly, and another of said grooves in a second gripping portion extending from said second end of said assembly toward and terminating short of said first end of said assembly, said grooves defining with said side face a pair of wedge segments on opposed sides of part of the axial length of said gripping portions, and at least one of said pair of segments being formed for relative displacement toward the other segment in a direction generally parallel to said side face over a portion of the axial length of said wedges upon urging of said assembly in the direction of convergence of said bore.
Claim 7
Dependent Claim
49 words
A tendon anchorage as defined in claim 4 wherein, said grooves are formed as slots extending completely through to the peripheral walls of said wedges and said slots extend axially a sufficient length of said wedges to overlap a common plane perpendicular to the longitudinal axis of said assembly.
Claim 8
Dependent Claim
248 words
In a wedge assembly for insertion into an anchor member formed with a wall defining a convergently tapered bore over a length thereof dimensioned at the smallest diameter to receive a plurality of tendons to be tensioned, and at least one wedge mountable in said bore and having a peripheral wall formed for axial sliding engagement with said bore defining wall in the direction of convergence of the said bore, said wedge having side faces extending internally from said peripheral wall and having a plurality of recessed tendon gripping portions formed in said side faces to receive a plurality of tendons to be tensioned, said wedge being formed for positioning in said bore with said side faces and said gripping portions, respectively, in opposed relation, said wedge including a plurality of axially extending grooves with at least a portion of one of said grooves extending from each of at least two of said plurality of gripping portions laterally toward said peripheral wall, said grooves and faces defining a pair of wedge segments on opposed sides of said gripping portions formed with said grooves over a portion of the length of said wedge, and at least one of said pair of segments being formed for relative displacement toward the other segment over a portion of its axial length upon mounting of said assembly in said anchor member and tensioning of said tendons, the improvement comprising: said axially extending grooves being skewed to the longitudinal axis of said wedge assembly.
Claim 9
Dependent Claim
248 words
In a wedge assembly for insertion into an anchor member formed with a wall defining a convergently tapered bore over a length thereof dimensioned at the smallest diameter to receive a plurality of tendons to be tensioned, and at least one wedge mountable in said bore and having a peripheral wall formed for axial sliding engagement with said bore defining wall in the direction of convergence of the said bore, said wedge having side faces extending internally from said peripheral wall and having a plurality of recessed tendon gripping portions formed in said side faces to receive a plurality of tendons to be tensioned, said wedge being formed for positioning in said bore with said side faces and said gripping portions, respectively, in opposed relation, said wedge including a plurality of axially extending grooves with at least a portion of one of said grooves extending from each of at least two of said plurality of gripping portions laterally toward said peripheral wall, said grooves and faces defining a pair of wedge segments on opposed sides of said gripping portions formed with said grooves over a portion of the length of said wedge, and at least one of said pair of segments being formed for relative displacement toward the other segment over a portion of its axial length upon mounting of said assembly in said anchor member and tensioning of said tendons, the improvement comprising: said axially extending grooves being skewed to the longitudinal axis of said wedge assembly.
References Cited (Backward Citations)
US3326791A
Cited
US3520032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |