US3940914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
False twister
Assignee: IHO Holding GmbH and Co KG
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Filing: 1975-01-03
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Granted: 1976-03-02
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Expires: 1995-01-03
Abstract
Abstract An apparatus for false twisting a thread having three rotatably mounted spindles each carrying a pluralilty of friction discs which overlap each other and means for passing a thread along a zig-zag path between the spindles and over the edges of the friction discs is provided with at least one friction disc having a twist stop edge which interrupts the helical path of the thread in a kink-like manner at the exit end of the path of the thread.
Inventors
- 👤 Friedrich Schuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:41
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/04; D02G1/08; D02G1/082
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
In an apparatus for false-twisting threads by means of friction discs which comprises three rotatably mounted mutually parallel spindles, each provided with at least one friction disc, the disc or discs on each spindle overlapping the discs on the other two spindles, and means for passing the thread to be false-twisted over the discs along a substantially helical path, the improvement which comprises providing one of the friction discs with a rotating twist stop edge disposed to interrupt the helical path of the thread in a kink-like manner on the exit face.
Claim 2
Dependent Claim
92 words
In an apparatus for false-twisting threads by means of friction discs which comprises three rotatably mounted mutually parallel spindles, each provided with at least one friction disc, the disc or discs on each spindle overlapping the discs on the other two spindles, and means for passing the thread to be false-twisted over the discs along a substantially helical path, the improvement which comprises providing one of the friction discs with a rotating twist stop edge disposed to interrupt the helical path of the thread in a kink-like manner on the exit face.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 wherein the twist stop edge is provided on only one of the friction discs.
Claim 4
Dependent Claim
21 words
The apparatus of claim 2 wherein the friction disc having the twist stop edge has at its periphery a sharp cross-section.
Claim 5
Dependent Claim
21 words
The apparatus of claim 3 wherein the friction disc having the twist stopping edge has an asymmetrical cross-section at its periphery.
Claim 6
Dependent Claim
24 words
The apparatus of claim 1 wherein the twist stopping edge has a high co-efficient of friction with respect to the thread to be false-twisted.
Claim 7
Dependent Claim
26 words
The apparatus of claim 5 wherein the friction disc having the twist stopping edge is provided with a ring of material of high co-efficient of friction.
Claim 8
Dependent Claim
67 words
The apparatus of claim 1 wherein the friction discs which are free from twist stop edges each have at their contact surfaces with the thread to be false-twisted portions of at least two materials having respectively a higher co-efficient of friction for imparting the false twist and a lower co-efficient of friction for guiding the thread on the disc, the contact surfaces having a convex cross-sectional shape.
Claim 9
Dependent Claim
30 words
The apparatus of claim 7 wherein the material with the higher co-efficient of friction at the contact surface is sandwiched on both sides between material of lower co-efficient of friction.
Claim 10
Dependent Claim
94 words
In an apparatus for false-twisting a thread having three rotatably mounted spindles each carrying a plurality of friction discs which overlap each other and means for passing a thread along a zig-zag path between the spindles and over the edges of the friction discs, the improvement wherein the friction disc immediately adjacent to the point of exit of the thread from between the friction discs has a sharp peripheral edge over which the thread moves as it emerges from its zig-zag path whereby a substantially uniformly constant false twist is imparted to the thread.
Claim 11
Dependent Claim
94 words
In an apparatus for false-twisting a thread having three rotatably mounted spindles each carrying a plurality of friction discs which overlap each other and means for passing a thread along a zig-zag path between the spindles and over the edges of the friction discs, the improvement wherein the friction disc immediately adjacent to the point of exit of the thread from between the friction discs has a sharp peripheral edge over which the thread moves as it emerges from its zig-zag path whereby a substantially uniformly constant false twist is imparted to the thread.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |